JP2014043990A - Range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which, even when oil content accumulates on a material having sound passing property which protects an active type muffling device of a range hood and the sound passing property declines, maintenance work is difficult for restoring the sound passing property and suppressing the deterioration of muffling effect.SOLUTION: A range hood comprises: an active muffling device 10 arranged in space 9 outside of an opening 8 on a wall surface 7 of a ventilation path 5; a porous plate 15 including a plurality of pores 14 at the opening 8; and a plate having multiple protrusions 17 including a plurality of protrusions 16 facing the plurality of pores 14. The range hood is configured in such a manner that the porous plate 15 is movable between a position where the porous plate 15 separates from the tips of the plurality of protrusions 16 of the plate having multiple protrusions 17, and a position where the plurality of protrusions 16 of the plate having multiple protrusions 17 are inserted into the plurality of pores 14 of the porous plate 15. Thereby, a range hood can be provided which is capable of suppressing the deterioration of muffling effect of the active type muffling device with simple maintenance work.

Description

  The present invention relates to a range hood provided with an active silencer that is attached to a ventilation passage of the range hood and silences noise generated during operation of the range hood.

  Range hoods installed in kitchens are required to reduce noise generated during operation. One means for solving such a problem is a method of mounting an active silencer in a range hood.

  Conventionally, as this type of range hood, there is known a structure in which a space separated from the ventilation path is separately provided in the hood portion, and a microphone and a speaker constituting an active silencer are disposed therein (for example, Patent Documents) 1).

  Hereinafter, the range hood will be described with reference to FIG.

  A range hood 101 illustrated in FIG. 7 includes an exhaust fan 103 and a ventilation path 104 that guides oil smoke sucked from below to the exhaust fan 103 in a hood case 102. An exhaust duct 106 connected to the exhaust port 105 of the exhaust fan 103 is drawn out of the room, and sucked smoke and the like are exhausted to the outside. The range hood 101 includes a speaker 107, a microphone 108 (not shown), and a controller 109 outside the ventilation path 104. When noise is detected by the microphone 108 during operation of the exhaust fan 103, the controller 109 is set to emit a sound having a phase opposite to that of the detection signal from the speaker 107 and mute. Thereby, the noise emitted from the range hood 101 into the room when the exhaust fan 103 is operated is reduced.

  Conventionally, an active silencer for an air passage is known in which a sound-permeable plate member is installed between a speaker or a microphone and the air passage (see, for example, Patent Document 2).

  The active silencer will be described below with reference to FIG.

  As shown in FIG. 8, a speaker box 202 is placed on the upper surface of a duct 201 via a plate material 203 and is fixed to a screw 204. The speaker box 202 includes a speaker 205 on the inner side and holds a microphone 206 on the outer side. The speaker 205 and the microphone 206 are in communication with the duct 201 via the plate material 203. The board material is a material with excellent sound permeability, heat insulation, and air tightness, such as open-cell soft urethane foam having these three properties, or a film having sound and air tightness effects and sound permeability, heat insulation. It is made of a material made by overlaying effective glass wool or felt. The speaker 205 and the microphone 206 are electrically connected to a signal processing control unit (not shown).

  When noise from the upstream of the duct (the left side in FIG. 8) propagates, it is detected by the microphone 206 through the plate material 203, converted into an electrical signal, and subjected to predetermined signal processing by the signal processing control unit. Supplied and converted to muffled sound waves. The muffled sound wave is emitted into the duct 201 through the plate material 203, and acts to interfere with noise and mute. Since the speaker 205 and the microphone 206 are installed facing the duct 201 that is the ventilation path, a high silencing effect can be expected with respect to the noise that propagates through the duct 201 that is the ventilation path, and the plate 203 is interposed. In addition, the microphone 206 and the speaker 205 can be protected from heat, dust, moisture, and the like inside the duct 201, and it can be expected to suppress deterioration of the silencing effect.

JP 2005-337484 A Japanese Patent Laid-Open No. 7-72873

  However, in the range hood described in Patent Document 1, noise emitted from the range hood 101 to the room is mainly generated from the exhaust fan 103, propagated through the ventilation path 104, and released from below. In the configuration of Patent Document 1 described above, since the microphone 108 and the speaker 107 are not installed in the ventilation path 104, there is a problem that it is difficult to obtain a sufficient silencing effect.

  Further, in the active silencer described in Patent Document 2, when an air flow containing oil smoke passes through the duct 201 like a range hood, a highly viscous oil component is necessary to ensure the sound permeability of the plate material 203. Since a small gap (for example, between the continuous foamed portion of soft urethane foam and fiber of glass wool) enters the plate material 203, there is a problem that the sound-transmitting property of the plate material 203 is impaired during long-term use and the silencing effect is reduced. Also, the oil that has entered the fine gaps in the plate material 203 cannot be removed by simple maintenance work such as wiping with the plate material 203 attached to the duct 201, or even if the plate material 203 is removed and wiped off. It is difficult to recover the sound transmission property because it is pushed into the plate material 203. In order to suppress the deterioration of the silencing effect of the active silencer, the plate material 203 is removed and washed, or the plate material 203 is replaced. There is a problem of requiring complicated maintenance work.

  Accordingly, the present invention solves the above-described problem, and includes an active silencer that has a high silencing effect on a ventilation path, and a range hood that can suppress deterioration of the silencing effect of the active silencer by simple maintenance work. The purpose is to provide.

  And in order to achieve the above-mentioned object, the present invention is provided above the heating cooker and connected to the outside, a discharge port, a suction port for sucking air containing oil smoke generated during cooking, a discharge port and a suction port A range hood comprising a hood having a ventilation path communicating with the air, a blower for exhausting air to the outside in the hood, and an active silencer for silencing noise propagating in the ventilation path, the active silencer Includes a microphone that detects sound waves disposed in a space outside the opening provided on the wall surface of the ventilation path, a speaker that emits sound waves, and a first protector that includes a plurality of pores in the opening; A second protective body provided with a plurality of protrusions facing the plurality of pores outside the protective body of the first protective body, the first protective body is the tip of the first protective body and the plurality of protrusions of the second protective body Are spaced apart from each other and the plurality of pores of the first protector And in which a plurality of projections of the protective body is movable between a position to be inserted, whereby it is intended to achieve the intended purpose.

  ADVANTAGE OF THE INVENTION According to this invention, the range hood provided with the active silencer which has a high silencing effect with respect to a ventilation path, and can suppress deterioration of the silencing effect of an active silencer with simple maintenance work can be provided.

Side sectional view of the range hood according to the first embodiment of the present invention. Enlarged sectional view of the same range hood in FIG. 1A (separated position) An enlarged cross-sectional view of the same range hood in FIG. 1A (insertion position) (A) Front view of perforated plate of same range hood, (b) Front view of multi-projection plate of same range hood (A) Partial enlarged view of the perforated plate and multi-projection plate of the same range hood (spaced position), (b) Partial enlarged view of the perforated plate and multi-projection plate of the same range hood (insertion position) Front view of a porous plate according to a second embodiment of the present invention Side sectional view showing a conventional range hood Side sectional view showing a conventional active silencer

  The cooker hood according to claim 1 of the present invention includes a discharge port that is installed above the heating cooker and communicates outdoors, a suction port that sucks in air containing oil smoke generated during cooking, and a discharge port and a suction port. A range hood having a hood having a ventilation path communicating therewith, a blower for exhausting air to the outside in the hood, and an active silencing apparatus for silencing noise propagating in the ventilation path; A microphone for detecting sound waves disposed in a space outside the opening provided on the wall surface of the ventilation path, a speaker for emitting sound waves, and a first protector having a plurality of pores in the opening; A second protection body having a plurality of protrusions facing the plurality of pores is provided outside the protection body, and the first protection body has the first protection body and the tips of the plurality of protrusions of the second protection body. The second position in the spaced apart position and the plurality of pores of the first protector A plurality of projections of Mamorukarada has a configuration in which movable between a position to be inserted.

  Thereby, a speaker and a microphone are installed facing the ventilation path via the first protector and the second protector, and the plurality of pores of the first protector, the first protector, and the second protector are installed. Because the gap formed when the tips of the plurality of protrusions of the protector are separated from each other can provide sound permeability between the ventilation path and the active silencer, it is high against noise propagating through the ventilation path. The muffler effect can be exhibited, and the microphone and the speaker can be protected from oil contained in the airflow in the ventilation path.

  Further, the oil content deposited on the plurality of pores of the first protective body by moving the first protective body to the position where the plurality of protrusions of the second protective body are inserted into the plurality of pores of the first protective body. Are removed by the plurality of protrusions of the second protective body, and then the first protective body has the plurality of pores of the first protective body and the tips of the plurality of protrusions of the first protective body and the second protective body. Since the sound transmission between the ventilation path and the active silencer can be restored by moving it to a separated position, a plurality of pores of the first protective body are blocked by oil accumulation due to simple maintenance work. The sound permeability between the ventilation path and the active silencer is lowered, and it is possible to suppress the deterioration of the silencing effect of the active silencer.

  Further, the first protector may be supported so as to hold a position where the tips of the plurality of protrusions of the first protector and the second protector are separated by elastic force.

  As a result, the first protective body is moved to a position where the plurality of protrusions of the second protective body are inserted into the plurality of pores of the first protective body, and the oil content deposited in the plurality of pores of the first protective body Is removed by the plurality of protrusions of the second protective body, and then the first protective body returns to the position where the tips of the plurality of protrusions of the second protective body are separated by elastic force, further simplifying the maintenance work. There is an effect that can be.

  Moreover, you may make it the structure which the some pore of a 1st protective body is a slit shape of an up-down direction.

  As a result, the oil component adhering to the first protector or the oil component that has been deposited on the wall surface of the ventilation path and then flows down to the first protector due to gravity flows down the first protector along the slit shape. The long-term suppression of the deterioration of the silencing effect of the active silencer due to the accumulation of the air will block the plurality of pores of the first protective body and lower the sound permeability between the ventilation path and the active silencer. There is an effect that can be.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIG. 1 to FIG. 4, the range hood 1 of the present embodiment includes a hood 4 having a discharge port 2 communicating outdoors and a suction port 3 for sucking air containing oil smoke generated during cooking, A ventilation path 5 in the hood 4 and a blower 6 for exhausting air to the outside are provided, an opening 8 is provided in one of the wall surfaces 7 of the ventilation path 5, and an active silencer 10 is provided in a space 9 outside thereof.

  The active silencer 10 includes a reference microphone 11 that detects noise propagating in the ventilation path 5, a speaker 12 that emits a sound having a phase opposite to that detected by the reference microphone 11, and a sound emitted from the speaker 12. An error microphone 13 for detecting noise attenuated by sound and an arithmetic controller (not shown) for connecting and controlling these are provided.

  The opening 8 of the wall surface 7 of the ventilation path 5 is provided with a porous plate 15 made of metal and having a plurality of pores 14 having a diameter of 2 mm as a first protector and having a thickness of 0.8 mm. As a second protector, a plurality of resin-made multiples provided with a plurality of projections 16 having a diameter of 1.6 mm and a height of 2 mm at positions facing the plurality of pores 14 of the perforated plate 15, and having a plurality of sound vents 21 A protruding plate 17 is provided.

  The multi-projection plate 17 is fixed to a wall surface constituting the space 9 so that a part of the outer periphery is separated, and the porous plate 15 is provided by an elastic leaf spring 18 between the multi-projection plate 17 and the porous plate 15. The tip of the projection 16 of the multi-projection plate 17 and the perforated plate 15 are held at a position having a gap 19 of 4 mm (hereinafter referred to as a separation position).

  If the size of the pores 14 is too large, the oil smoke in the ventilation path 5 easily passes through the perforated plate 15, and the active silencer 10 cannot be protected from the oil smoke. Since the pores 14 are blocked by the accumulation of the oil component 20 and the sound transmission is impaired, it is desirable that the circular shape has a diameter of about 2 mm to 5 mm or a rectangular shape with a side of about 2 mm to 5 mm. The aperture ratio of the porous plate 15 is desirably 50% or more in order to ensure sound transmission.

  With the above configuration, when the blower 6 is operated during cooking, the air containing the oil smoke collected by the hood 4 and sucked from the suction port 3 flows into the blower 6 through the ventilation path 5 and exhausts from the discharge port 2 to the outside. Is done. At this time, the noise emitted from the blower 6 propagates through the ventilation path 5, and the noise is reduced by the silencing effect of the active silencer 10 and is emitted from the inlet 3 into the room.

  At this time, since the speaker 12, the reference microphone 11, and the error microphone 13 of the active silencer 10 are protected from oily smoke by the perforated plate 15 and the multi-projection plate 17, the characteristics can be maintained over a long period of time. It can suppress that a silencing effect deteriorates.

  Further, since the porous plate 15 having sound transmission properties due to the plurality of pores 14 is located at a distance from the multi-projection plate 17, the pores 14 of the porous plate 15, the gap 19 between the porous plate 15 and the multi-projection plate 17, the Since the sound passage 21 and the multi-projection plate 17 and the wall surfaces constituting the space 9 are separated from each other, the sound passage can be provided between the air passage 5 and the active silencer 10. High noise reduction effect can be demonstrated against noise propagating through

  Further, as shown in FIG. 5 a), the plurality of pores 14 of the perforated plate 15 are blocked by the accumulation of the oil component 20, and the sound permeability between the ventilation path and the active silencer is reduced, and the active silencer 5b), the perforated plate 15 is pushed from the air passage 5 side, and the plurality of projections 16 of the multi-projection plate 17 are inserted into the plurality of pores 14 of the perforated plate 15, as shown in FIG. The oil content 20 accumulated in the plurality of pores 14 of the perforated plate 15 is pushed out to the ventilation path 5 side by the plurality of projections 16 of the multi-projection plate 17 by moving to a position (hereinafter referred to as an insertion position). Sound transmission can be restored.

  When the force for pushing the perforated plate 15 is released, the perforated plate 15 can be automatically moved to the separated position by the elastic force of the leaf spring 18 between the multi-projection plate 17 and the perforated plate 15, and the ventilation path 5 and the active plate 5 are activated. The sound permeability between the muffler 10 can be recovered.

  As described above, the simple operation of pushing the perforated plate 15 closes the plurality of pores 14 of the perforated plate 15 due to the accumulation of the oil component 20, and the sound permeability between the ventilation path 5 and the active silencer 10 is lowered. Therefore, it is possible to suppress the deterioration of the silencing effect of the active silencer 10.

  That is, since the wiping operation with a cloth or the like and the operation of pushing the perforated plate 15 into the insertion position can be performed at the same time, it is pushed out from the pores 14 to the side of the ventilation path 5 by the projections 16 of the multi-projection plate 17 with a simple operation. The oil component 20 can be effectively removed.

  In the present embodiment, the range hood 1 exhausts air to the outdoors, but the same effect can be obtained with the circulation type range hood 1 that returns air to the room.

  In this embodiment, the reference microphone 11, the speaker 12, and the error microphone 13 of the active silencer 10 are arranged outside one opening 8, but each is arranged outside a different opening 8. The same effect can be obtained with the individuality including the porous plate 15 and the multi-projection plate 17 in FIG.

  In the present embodiment, the error microphone 13 is used to confirm and correct the effect of mute by the speaker 12 in order to perform feedback control to enhance the muffling effect. However, the arithmetic control without using the error microphone 13 is used. In some cases, the error microphone 13 can be omitted by using the method.

  In this embodiment, the plate spring 18 is used to automatically move the porous plate 15 from the insertion position to the separation position by elastic force. However, the plate spring 18 can be moved manually or electrically using a stepping motor or the like. The perforated plate 15 may be moved.

  In the present embodiment, the means for elastically holding the perforated plate 15 is the leaf spring 18, but another type of spring such as a coil spring may be used, or it may be held by an elastic material such as rubber or silicon. It may be held using.

(Embodiment 2)
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the plurality of pores 14 of the porous plate 15 have a slit shape with a width of 2 mm in the vertical direction. In addition, the multi-projection plate 17 (not shown) includes a projection 16 having a width of 1.6 mm.

  With the above configuration, the oil component 20 adhering to the porous plate 15 and the oil component 20 flowing down to the porous plate 15 due to gravity after being deposited on the wall surface 7 of the ventilation path 5 are located below the porous plate 15 along the slit-shaped pores 14. Therefore, the accumulation of the oil component 20 blocks the plurality of pores 14 of the perforated plate 15, thereby reducing the sound permeability between the ventilation path 5 and the active silencer 10, and the noise reduction effect of the active silencer 10 is deteriorated. It can be suppressed for a long time.

  Note that it is more preferable to impart oil repellency to the surface of the porous plate 15 by a process such as painting, because the oil component 20 can be promoted to flow down the porous plate 15 along the slit-shaped pores 14.

  The range hood according to the present invention is useful as an exhaust facility for homes or stores where quietness is required, and the active silencer according to the present invention has a sufficient silencing effect on the ventilation path and has a silencing effect. Since the microphone and the speaker can be protected from oil and the like that cause deterioration, and can be used for a long time with simple maintenance work, it is useful as a silencer installed in various ventilation air-conditioning equipment.

DESCRIPTION OF SYMBOLS 1 Range hood 2 Discharge port 3 Suction port 4 Hood 5 Ventilation path 6 Blower 7 Wall surface 8 Open 9 Space 10 Active silencer 11 Reference microphone 12 Speaker 13 Error microphone 14 Pore 15 Perforated plate 16 Projection 17 Multi-projection plate 18 Plate spring 19 Clearance 20 Oil 21 Sound outlet

Claims (3)

Installed above the heating cooker,
A hood having a discharge port that communicates outdoors, a suction port that sucks in air containing oil smoke generated during cooking, and a ventilation path that communicates the discharge port and the suction port,
A blower that exhausts air to the outside in the hood, and a range hood that includes an active silencer that silences noise propagating in the ventilation path,
The active silencer is
A microphone for detecting sound waves disposed in a space outside the opening provided on the wall surface of the ventilation path;
Equipped with a speaker that emits sound waves,
A first protector comprising a plurality of pores in the opening;
Providing a second protector comprising a plurality of protrusions facing the plurality of pores on the outside of the first protector;
The first protector is
The positions where the tips of the plurality of protrusions of the first protector and the second protector are spaced apart, and the plurality of protrusions of the second protector in the plurality of pores of the first protector A range hood that is movable between the position where the is inserted. The first protector is
The range hood according to claim 1, wherein the range hood is supported by an elastic force so as to hold positions where the tips of the plurality of protrusions of the first protective body and the second protective body are separated from each other. The range hood according to claim 1 or 2, wherein the plurality of pores of the first protector have a slit shape in the vertical direction.

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