JP5454085B2 - Ventilation equipment - Google Patents

Description

  The present invention relates to a ventilator that exhausts indoor air that is attached to a ceiling or the like through a ventilation duct.

  Conventionally, in order to reduce noise, this type of ventilator is known in which an air path is made of a sound absorbing material such as a sound absorbing material between a grill facing the room and a blower inside the main body (for example, a patent) Reference 1).

  The configuration will be described below with reference to FIG.

  The ventilator 101 has a fan 106 incorporated in an upper surface side of a box-shaped main body 104 having an opening surface 102 opened on the lower surface and an exhaust port 103 on one side with the suction port 105 facing the opening surface. ing. A sound-absorbing bell mouth 107 formed of a porous sound-absorbing material is attached to the opening surface 102 of the main body 104 in parallel with the suction port 105 so as to cover the opening surface 102, and between the suction port 105 and the sound-absorbing bell mouth 107. The back air layer 108 is hermetically sealed. A decorative grill 110 is attached to an attachment flange 109 formed around the opening surface 102 of the main body 104, and a panel 111 is attached via the decorative grill 110 so as to close the opening surface 102 of the main body 104. On the back side of the panel 111, the sound absorbing bell mouth 107 has a distal end that enters the sound absorbing bell mouth 107, and together with the sound absorbing bell mouth 107, forms a sound absorbing air passage 112 that communicates with the suction port 105. The member 113 is fixed. When the fan 106 is operated, room air is sucked into the main body 104 from the outer peripheral portion of the panel 111 through the sound absorption air passage 112, further sucked into the fan 106 through the suction port 105, and ventilated from the exhaust port 103 of the main body 104. Although it is exhausted to the outside through the duct, the sound-absorbing air passage 112 is constituted by the sound-absorbing bell mouth 107 and the sound-absorbing guide member 113, which are sound-absorbing material structures. The sound is absorbed by the sound absorbing air passage 112 and released into the room.

Utility Model Registration No. 2504940

  In such a conventional ventilator 101, the suction port 105 of the fan 106 and the opening surface 102 of the main body 104 are close to each other and the path of the sound absorption air passage 112 is short, so that the noise is not sufficiently absorbed in the room. It had the problem of being released.

  Accordingly, the present invention solves the above-described conventional problems, and lengthens the path that is silenced by the silencing means between the opening surface 102 facing the room and the suction port 105 of the fan 106, and noise emitted into the room. An object of the present invention is to provide a ventilator with reduced airflow.

In order to achieve this object, the present invention includes a centrifugal fan having a suction port facing downward, and a rectangular parallelepiped first provided with an exhaust port on one side for connecting the blower outlet of the centrifugal fan and the duct . A first box and a second box that includes an opening facing the chamber on the lower surface and that includes a silencing means, and the first communication port provided on the side of the first box is the second communication port. a contact combined ventilator which communicates with to face the second communication port provided on a side surface of the box body, the muffler is at the bottom of the second communication port, emitted from the second communicating port A first microphone that detects sound waves to be generated, a second microphone that detects noise in the opening, and an electrical component that incorporates a control circuit that generates sound waves of opposite phase from the sound waves detected by the first microphone; Active with the speaker that generates the sound wave of the opposite phase A sound unit, wherein a plate member is extended in parallel from the active silencer unit so that an air passage extending from the opening to the second communication port wraps around the plate member; and the second microphone Faces the upper side of the plate-like member, the speaker faces the lower side of the plate-like member, and the second microphone is a ventilator arranged at a position closer to the opening on the lower surface than the speaker . This is to achieve the intended purpose.

According to the present invention, a rectangular parallelepiped first box body that includes a centrifugal fan with a suction port facing downward, and has an exhaust port on one side surface that communicates between the blowout port of the centrifugal fan and the duct , A second box body including an opening facing the chamber and including a sound deadening means, and a first communication port provided on a side surface of the first box body is provided on a side surface of the second box body . a contact combined ventilator which communicates with to face the communication opening of the muffler is at the bottom of the second communication port, first to detect the acoustic waves emitted from the second communicating port A microphone, a second microphone for detecting noise in the opening, an electrical component having a built-in control circuit for generating a reverse-phase sound wave from the sound wave detected by the first microphone, and generating the reverse-phase sound wave An active silencer unit integrated with a speaker, wherein A plate-like member is extended in parallel from the muffler unit, and an air path extending from the opening to the second communication port is formed to wrap around the plate-like member, and the second microphone is located above the plate-like member. facing the speaker faces the lower side of the plate-like member, the second microphone, by which the configuration of the ventilator disposed in a position closer to the opening portion of the lower surface than the speaker, a surface in the room It is possible to obtain an effect of lengthening a path that is silenced by the silencing means between the opening to be made and the fan inlet, and reducing noise emitted into the room.

Side sectional view which shows the ventilator of Embodiment 1 of this invention Side sectional view which shows the ventilation apparatus of Embodiment 2 of this invention Side sectional view which shows the ventilation apparatus of Embodiment 3 of this invention Side sectional view which shows the ventilator of Embodiment 4 of this invention Side sectional view which shows the ventilator of Embodiment 5 of this invention Side sectional view showing a conventional ventilation system

The ventilator according to claim 1 of the present invention includes a centrifugal fan having a suction port facing downward, and has a rectangular parallelepiped first shape provided with an exhaust port on one side for communicating the blower outlet of the centrifugal fan and the duct . A box and a second box having an opening facing the chamber on the lower surface and containing a silencing means, and the first communication port provided on the side of the first box is the second box a first provided of the side two contact engagement ventilator which communicates with to face the communication opening of the muffler is at the bottom of the second communication port, is discharged from the second communicating port A first microphone for detecting sound waves, a second microphone for detecting noise in the opening, an electrical component having a built-in control circuit that generates sound waves of opposite phase from the sound waves detected by the first microphone, and the reverse Active silencer unit integrated with a speaker that generates phase sound waves The plate-like member is extended in parallel from the active silencing unit, and an air path extending from the opening to the second communication port is formed to wrap around the plate-like member, and the second microphone is The speaker faces the upper side of the plate member, the speaker faces the lower side of the plate member, and the second microphone is arranged at a position closer to the opening on the lower surface than the speaker . Thereby, the noise released from the fan suction port by the plate-like member is interposed between the opening facing the chamber and the suction port of the fan by the second box body provided with the silencer. This makes it possible to lengthen the path to be silenced and to reduce the noise emitted to the room.

That is, the plate-like member, it is possible to increase a microphone for detecting the noise emitted from the suction port of the fan, the path between the speaker for generating sound waves of opposite phase to the noise, noise caused by the microphone Since the time from the detection of the sound to the generation of the sound wave by the speaker can be increased, the effect of active silencing can be improved, and the noise released into the room can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, a ventilator 1 used as a ceiling-embedded ventilation fan attached to a ceiling to ventilate a space such as a bathroom or a toilet includes a centrifugal fan 2 and an air outlet 3 of the centrifugal fan 2. A rectangular parallelepiped (first box 6 having a rectangular parallelepiped shape (for example, 230 mm square and 120 mm in height)) having an exhaust port 5 communicating with the duct 4 on one side surface, and an opening 8 facing the chamber on the lower surface 7. (For example, a 230 mm square and a height of 200 mm), and the first box 6 and the second box 9 have a first communication port 10 and a first The two communication ports 11 are detachably joined so as to face each other. A suction grill 12 is provided so as to cover the opening 8 on the lower surface 7 of the second box 9.

  The centrifugal fan 2 in the first box body 6 is arranged above the first box body 6 with the suction port 13 facing downward, and below the first box body 6 from the first communication port 10. A first air passage 14 reaching the suction port 13 of the centrifugal fan 2 is formed.

  By providing the centrifugal fan 2 in the first box 6 with a higher static pressure than other types of fans such as an axial fan, the centrifugal fan 2 can be reduced in size and the size of the first box 6 can be increased. It can be downsized.

  In the second box 9, a plate-like member 15 extends in parallel from the lower part of the second communication port 11 communicating with the first box 6, and the opening of the lower surface 7 of the second box 9 8 and the air inlet 16 of the centrifugal fan 2 in the first box 6, and the second air passage 16 extending from the opening 8 on the lower surface 7 of the second box 9 to the second communication port 11. However, the plate-like member 15 is formed so as to go around the plate-like member 15, and the plate-like member 15 has a sound insulating function as a silencer.

  The first air passage 14 in the first box 6 and the second air passage 16 formed by the plate-like member 15 in the second box 9 have a sound absorbing function as a sound absorbing means. Material 17 (for example, glass wool) is affixed.

  The cross-sectional areas of the second air passage 16 and the first air passage 14 from the opening 8 on the lower surface 7 of the second box 9 to the suction port 13 of the centrifugal fan 2 of the first box 6 are always constant. It is equal to or larger than the area of the suction port 13 of the centrifugal fan 2.

  The height (120 mm) of the first box 6 is smaller than the height (200 mm) of the second box 9, and the lowermost end 18 of the first box 6 is the lower surface 7 of the second box 9. It is located above.

  Further, the first communication port 10 of the first box 6 can be changed in position to the side surface other than the exhaust port 5 by opening and closing the lid member 19 on the side surface of the first box body 6. The direction of the exhaust port 5 of the first box 6 can be changed and joined so that the surface provided with the communication port 10 and the second communication port 11 of the second box 9 face each other. Yes.

  With the above-described configuration, when the centrifugal fan 2 is operated, the intake air flows from the suction grill 12 to the opening 8 on the lower surface 7 of the second box 9, the second air passage 16, the second communication port 11, the first Through the communication port 10, the first air passage 14, and the suction port 13 of the centrifugal fan 2, which are led to the centrifugal fan 2 and discharged from the duct 4 through the exhaust port 5 through the exhaust port 3 to the outside. Is done.

  At this time, various noises such as rotational noise of the centrifugal fan 2, turbulent noise generated inside the centrifugal fan 2, and noise amplified by resonance in the centrifugal fan 2 are emitted from the suction port 13 of the centrifugal fan 2. However, a part of the noise is absorbed by the sound absorbing material 17 attached to the first air passage 14 in the first box 6, and the noise that has not been absorbed is the first communication port 10 and the second communication port. 11 is discharged to the second box 9. While the noise emitted from the second communication port 11 to the second box 9 reaches the opening 8 on the lower surface 7, the opening 8 on the lower surface 7 of the second box 9 and the first box 6. Since the second air passage 16 is formed so as to go around by the plate-like member 15 that blocks the suction port 13 of the centrifugal fan 2 in the inside, noise is directly emitted from the opening 8 on the lower surface 7 of the second box 9. However, the length of sound insulation by the plate-like member 15 is increased, and the length of sound absorption by the sound absorbing material 17 is increased. The combination of the sound insulation and sound absorption functions allows the opening 8 to enter the chamber. The emitted noise can be reduced.

  At this time, the cross-sectional area of the second air passage 16 and the first air passage 14 from the opening 8 of the second box 9 to the suction port 13 of the centrifugal fan 2 is always the same as that of the suction port 13 of the centrifugal fan. Since it is equal to or larger than the area, it is possible to suppress the generation of pressure loss due to the reduction in cross section, and it is possible to suppress the increase in noise due to the deterioration of the blowing efficiency and the increase in the rotation speed of the fan.

  In addition, since the lowermost end 18 of the first box 6 is located above the opening 8 of the lower surface 7 of the second box 9, the first box 6 is located on the back side of the ceiling material 20. It can be installed, and the noise insulation effect of the ceiling material 20 can reduce noise transmitted through the first box 6 and released into the room.

  Moreover, since the 1st box 6 and the 2nd box 9 can be attached or detached, the division | segmentation construction which installs the 2nd box 9 after installing the 1st box 6 previously can be performed. Therefore, the area of the installation opening 21 provided in the ceiling material 20 can be reduced to the area of the second box 9 only, the installation work can be facilitated, and the appearance of the ceiling material 20 is improved. Can do.

  Moreover, since the attachment direction to the 2nd box 9 of the 1st box 6 can be changed, since the direction of the exhaust port 5 connected with the duct 4 can be changed, construction of the ventilation apparatus 1 is possible. Sometimes the degree of freedom in handling the duct 4 is increased, and installation work can be facilitated.

(Embodiment 2)
2, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 2, a plurality of small sections 23 having small holes 22 are provided so as to surround the second air passage 16 in the second box 9, and a Helmholtz resonance type silencing mechanism is formed as a silencing function. Yes.

  With the above configuration, the Helmholtz resonance formed by the small holes 22 and the small sections 23 while the noise emitted from the second communication port 11 to the second box 9 reaches the opening 8 of the lower surface 7. A part of the noise having a frequency that matches the resonance frequency of the mold silencer is silenced, and the noise emitted from the opening 8 to the room can be reduced.

  Note that by making the area of the small holes 22 and the volume of the small compartments 23 non-uniform, noises of different frequencies can be silenced in the respective small compartments 23, so that the range of frequencies to be silenced can be expanded. .

  In addition, by making the area of the small hole 22 and the volume of the small section 23 uniform, the noise of the same frequency can be silenced in all the small sections 23, so that the silencing effect for a specific frequency can be improved. it can.

(Embodiment 3)
3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, the second box 9 is provided with a second air passage 16 and a back air layer 25 formed of a plurality of perforated plates 24, and a perforated plate resonance type silencing mechanism is formed as a silencing function. ing.

  With the above configuration, the perforated plate type formed by the perforated plate 24 and the back air layer 25 while the noise emitted from the second communication port 11 to the second box 9 reaches the opening 8 of the lower surface 7. A part of the noise having a frequency that matches the resonance frequency of the silencer is silenced, and the noise emitted from the opening 8 to the room can be reduced.

(Embodiment 4)
4, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the second air passage 16 in the second box 9 is provided with a plurality of protrusions 26, and a side branch type silencing mechanism is formed as a silencing function.

  With the above configuration, while the noise released from the second communication port 11 to the second box 9 reaches the opening 8 of the lower surface 7, the side branch type silencing mechanism formed by the plurality of protrusions 26 A part of the noise having a frequency specified by the shape of the protruding portion 26 is silenced, and the noise emitted from the opening 8 to the room can be reduced.

(Embodiment 5)
In FIG. 5, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, an active silencing unit 27 is provided in the second box 9 at the lower portion of the second communication port 11 communicating with the first box 6. A second air passage 16 extending from the opening 8 on the lower surface 7 of the second box 9 to the second communication port 11 is formed so as to go around the plate-like member 15 by extending the member 15.

  The active silencer unit 27 includes a first microphone 28 that detects sound waves, a second microphone 29, an electrical unit 30 that includes a control circuit that generates sound waves of opposite phase from the detected sound waves, and a speaker that generates sound waves of opposite phase. The first microphone 28 faces the second communication port 11 above the plate-like member 15 in the second air passage 16, and the speaker 31 faces below the plate-like member 15. The second microphone 29 is disposed at a position closer to the opening 8 on the lower surface 7 than the speaker 31.

  With the above-described configuration, the sound wave emitted from the second communication port 11 by the first microphone 28 is detected, and the control circuit in the electrical unit 30 while the sound wave reaches the opening 8 through the second air passage 16. Produces an additional sound wave based on the sound wave detected by the first microphone 28 so that the noise is minimized at the position of the second microphone 29 and emits it from the speaker 31. Further, the characteristic of the additional sound wave is adjusted from the detection signal of the second microphone 29 so that the noise is minimized.

  At this time, since the second air passage 16 is formed so as to go around the plate-like member 15 in the second box 9, the distance between the first microphone 28 and the speaker 31 can be increased. Therefore, since the time for the sound wave detected by the first microphone 28 to reach the opening 8 can be increased, an additional sound wave of a high frequency sound wave can be created, and the frequency band that can be silenced is expanded to be an active type. The silencing effect can be improved and the noise emitted to the room can be reduced.

  A ventilator according to the present invention includes a first box body that includes an exhaust port and includes a fan, and a second box body that includes an opening facing the chamber on the lower surface and includes a silencer. A path that is silenced by the silencing means between the opening facing the room and the air inlet of the fan because the box is configured as a ventilator that is joined to the side surface of the second box and communicates through the communication port. This is useful as a ventilation fan or the like because it increases the length and reduces the noise emitted into the room.

DESCRIPTION OF SYMBOLS 1 Ventilator 2 Centrifugal fan 3 Air outlet 4 Duct 5 Exhaust port 6 1st box 7 Lower surface 8 Opening 9 2nd box 10 1st communicating port 11 2nd communicating port 12 Suction grill 13 Suction port 14 First air passage 15 Plate member 16 Second air passage 17 Sound absorbing material 18 Bottom end 19 Lid member 20 Ceiling material 21 Installation opening 22 Small hole 23 Small section 24 Perforated plate 25 Back air layer 26 Protruding portion 27 Active silence Unit 28 First microphone 29 Second microphone 30 Electrical component 31 Speaker

Claims (1)

A rectangular parallelepiped first box body that includes a centrifugal fan with a suction port facing downward, and has an exhaust port on one side for communicating the blower outlet and duct of the centrifugal fan, and an opening facing the chamber on the lower surface A first box provided on the side of the first box faces a second port provided on the side of the second box. a contact engagement is ventilator which communicates via a communication port as said mute section, at the bottom of the second communication port, the first microphone detecting a sound wave emitted from the second communicating port A second microphone that detects noise in the opening, an electrical component that includes a control circuit that generates a reverse-phase sound wave from the sound wave detected by the first microphone, and a speaker that generates the reverse-phase sound wave Is an active silencer unit integrated with A plate-like member is extended in parallel from the sound unit, and an air path extending from the opening to the second communication port is formed to wrap around the plate-like member, and the second microphone is located above the plate-like member. The ventilation device is arranged such that the speaker faces below the plate-like member, and the second microphone is disposed at a position closer to the opening on the lower surface than the speaker .

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