JP2012184916A - Range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a range hood capable of reducing noise in operation and having superior silencing performance.SOLUTION: The range hood is attached with a sound absorbing mechanism 30 of a resonator-type sound absorbing structure having an air layer 33 at the back of a perforated plate 32 having a plurality of holes 31 on an inner surface of a blower box 2 mounted on the hood 1 to absorb sound generated in operation to reduce noise.

Description

  The present invention relates to a range hood that collects smoke, steam, odor, and the like generated during cooking and discharges them outdoors.

Conventionally, various range hoods are known.
For example, as disclosed in Patent Document 1, a hood body, a blower, and an exhaust duct are provided, and by driving the blower, air containing smoke, steam, odor, etc. generated during cooking is collected in the hood body. A range hood is known in which the air is discharged to the outside through an exhaust duct.

JP-A-2005-98618

The above-described conventional range hood has been sufficiently studied to efficiently collect air, but noise generated by operating the range hood has not been sufficiently studied.
On the other hand, with the recent spread of open kitchens and the like, noise generated during operation becomes a problem, and a range hood with less noise generated during operation and excellent quietness is desired.

  An object of the present invention is to provide a range hood with less noise generated during operation and excellent quietness.

The present invention is a range hood provided with a hood body 3, a blower 4, and an exhaust duct 44.
The range hood is characterized in that a sound absorbing mechanism 30 having a resonator type sound absorbing structure in which an air layer 33 is provided behind an open plate 32 provided with a plurality of holes 31 is attached to the inner surface of the hood body 3.

The present invention is a range hood provided with a hood body 3 having a current plate 16, a blower 4 and an exhaust duct 44.
The range hood is characterized in that a sound absorbing mechanism 30 having a resonator type sound absorbing structure in which an air layer 33 is placed behind a perforated plate 32 provided with a plurality of holes 31 is attached to the inner surface of the rectifying plate 16. You can also.

The present invention is a range hood provided with a hood body 3, a blower 4, an exhaust duct 44 and a curtain plate 60,
A range hood characterized in that a sound absorbing mechanism 30 having a resonator type sound absorbing structure in which an air layer 33 is placed behind a perforated plate 32 provided with a plurality of holes 31 is attached to the back of the curtain plate 60. You can also.

The present invention is a range hood provided with a hood body 3, a blower 4, and an exhaust duct 44.
A range hood characterized in that a sound absorbing mechanism 30 having a resonator type sound absorbing structure in which an air layer 33 is placed behind an open plate 32 provided with a plurality of holes 31 is attached to an inner surface of a casing 40 of the blower 4. You can also

The present invention is a range hood provided with a hood body 3, a blower 4, an exhaust duct 44, and a duct cover 70.
The range hood is characterized in that a sound absorbing mechanism 30 having a resonator type sound absorbing structure in which an air layer 33 is provided behind an open plate 32 provided with a plurality of holes 31 is provided on the inner surface of the duct cover 70. You can also.

According to the range hood of the present invention, the sound generated during the operation of driving the blower 4 to suck air into the hood body 3 and discharging it to the outside through the exhaust duct 44 is generated by the inner circumference of the hood body 3 or the rectifying plate 16. Since sound is absorbed by the sound absorbing mechanism 30 attached to the inner surface or the back surface of the curtain plate 60, the inner surface of the casing 40 of the blower 4, or the inner surface of the duct cover 70, the sound transmitted to the periphery of the range hood is reduced.
Therefore, it is possible to provide a range hood with less noise generated during operation and excellent quietness.

It is a front view of the range hood which shows the 1st Embodiment of this invention. It is a side view of the range hood which shows the 1st Embodiment of this invention. It is an AA expanded sectional view of FIG. It is a front view of an anaaki board. It is sectional drawing of embodiment which provided the sound absorption mechanism in a part in the front part of the surrounding surface board of an air blower box. It is sectional drawing of embodiment which made the food body integral type. It is sectional drawing of the range hood which shows the 2nd Embodiment of this invention. It is a perspective view of the baffle plate which attached the sound absorption mechanism. It is sectional drawing of the range hood which shows the 3rd Embodiment of this invention. It is a front view of the air blower which shows the 4th Embodiment of this invention. It is BB sectional drawing of FIG. It is a front view which shows embodiment from which an air blower differs. It is CC sectional drawing of FIG. It is a top view of the range hood which shows the 5th Embodiment of this invention. It is DD sectional drawing of FIG.

As shown in FIGS. 1 to 3, a hood 1 and a blower box 2 constitute a hood body 3.
The hood 1 has a concave portion 14 opened to the lower surface by an upper surface plate 10, an outer peripheral surface plate 11, a lower surface plate 12, and an inner peripheral surface plate 13, and an opening portion 15 communicating the concave portion 14 with the upper surface. Is a thin box-shaped body smaller than the front and rear dimensions and the left and right dimensions.
A rectifying plate 16 is attached in the recessed portion 14 of the hood 1, and air flows through a gap between the outer peripheral surface of the rectifying plate 16 and the recessed portion 14 (inner peripheral surface plate 13).
A filter 17 is attached to the opening 15 of the hood 1.
The blower box 2 has a box shape with an upper surface plate 20, a peripheral surface plate 21, and a lower surface plate 22, and an air intake port 23 is formed in the lower surface plate 22.
The bottom plate 22 is placed on the top plate 10 of the hood 1, and the hood 1 and the blower box 2 are connected with the air intake port 23 communicating with the opening 15.

A blower 4 is attached in the blower box 2.
The blower 4 is provided with a fan 41 in a casing 40, and the fan 41 is rotated by a motor (not shown) so that air is sucked from the suction port 42 and discharged from the discharge port 43.
The suction port 42 opens into the blower box 2, and an exhaust duct 44 is connected to the discharge port 43.

In the case of the above-described range hood, by operating the range hood by rotating the fan 41 of the blower 4, air containing smoke, steam, odor, etc. generated during cooking is sucked into the hood 1 and the air is filtered. 17 flows into the blower box 2 through the suction port 42, is discharged from the suction port 42 to the discharge port 43, and is exhausted outdoors by the exhaust duct 44.
As described above, noise is generated by operating the range hood.
For example, the motor 4 of the blower 4, the rotation sound of the fan 41, the wind noise when air passes through the filter 17, the sound of air flowing through the exhaust duct 44, etc. are generated and transmitted to the surroundings of the range hood as noise. Become.

Accordingly, the present invention provides a range hood that is provided with a sound absorbing mechanism 30 that absorbs the above-described generated sound, reduces noise transmitted to the periphery of the range hood, and increases quietness.
The sound absorbing mechanism 30 is a resonator type sound absorbing structure in which a Helmholtz resonator having an air layer 33 placed behind a perforated plate 32 provided with a plurality of holes 31, and the plurality of holes 31 and the air layer 33 are arranged. When a sound having the same frequency as the resonance frequency determined by the above hits the perforated plate 32, Helmholtz resonance is generated in the hole 31 and the air layer 33, and a sound absorbing action is performed.

In the embodiment shown in FIG. 3, the perforated plate 32 is provided to be opposed to the inner surface of the front surface portion 21 a of the peripheral surface plate 21 of the blower box 2, and the perforated plate 32 and the inner surface of the front surface portion 21 a are provided. An air layer 33 is formed therebetween.
In this way, since the sound absorbing mechanism 30 can be formed with only the perforated plate 32, the number of parts can be reduced and the cost can be reduced.

For example, a protruding piece 32a is provided on the outer peripheral edge of the rear surface of the perforated plate 32 so as to protrude from the rear surface. The protruding piece 32a has a bowl shape, but is not limited thereto, and may have a linear shape.
By attaching the perforated plate 32 with the projecting piece 32a in contact with the inner surface of the front portion 21a, the air layer 33 is formed behind the perforated plate 32 between the inner surface of the front portion 21a and the perforated plate 32. It is formed.

  In this way, the perforated plate 32 may be attached so that the projecting piece 32a is in contact with the inner surface of the front surface portion 21a. Therefore, the work of attaching the perforated plate 32 is easy.

  The sound absorbing mechanism 30 is not limited to that described above, and a back plate is provided behind the perforated plate 32 with a space therebetween, and an air layer 33 is provided between the back plate and the perforated plate 32. Also good.

The sound absorbing mechanism 30 shown in FIG. 3 is provided with a fibrous sound absorbing member (porous material) 34 such as glass wool or rock wool behind the perforated plate 32 to increase the sound absorption rate.
The reason why the above-mentioned protruding piece 32a has a bowl shape is to attach the fibrous sound absorbing member 34 behind the perforated plate 32.

The resonance frequency f ₀ of the sound absorbing mechanism 30 of the present invention is expressed by the following equation.

As an example, the plate thickness of the material is 0.6 [mm], the hole diameter Φ is 2 [mm], the interval between the holes is 1 [cm], the thickness of the air layer is 10 [cm], and the speed of sound is 340 [ m / s], the resonance frequency f ₀ is f ₀ = 646 [Hz].
It becomes.
When the diameter Φ of the hole is 4 [mm] (other conditions are similar values)
f ₀ = 984 [Hz]
It becomes.
Also, assuming that the hole diameter Φ is 4 [mm] and the interval between the holes is 3 [cm] (other conditions are the same as above)
f ₀ = 328 [Hz]
It becomes.

  Thus, in the sound absorbing mechanism 30 of the present invention, the frequency band in which sound absorption is desired can be set by arbitrarily setting the diameter of the holes, the interval between the holes, and the thickness of the air layer.

Further, the thickness r of the hole can be set in accordance with the frequency of the sound to be absorbed, with the plate thickness of the material, the interval between the holes, and the thickness of the air layer being constant.
For example, when the plate thickness of the material is 0.6 [mm], the interval between the holes is 1 [cm] in the vertical and horizontal directions, and the thickness of the air layer is 3 [cm], the sound of 1500 [Hz] is to be absorbed. The hole radius r may be 2.77 [mm].

  As described above, since the frequency of the sound that can be absorbed varies depending on the diameter of the hole 31 of the perforated plate 32, a range is provided for the frequency of sound absorption by mixing holes of different diameters in one perforated plate 32. It is possible.

As shown in FIG. 4, the punched plate 32 of this embodiment has a hole 31a having a large diameter at the outer peripheral portion, a hole 31b having a smaller diameter at the inner peripheral portion, and a diameter at the intermediate portion. Forms a hole 31c having an intermediate size.
By doing in this way, the width | variety can be provided in the frequency which absorbs sound.

Next, the attachment of the perforated plate 32 will be specifically described.
As described above, when the perforated plate 32 is attached to the inner surface of the blower box 20, the perforated plate 32 may become dirty with smoke or the like, and the hole 31 may be blocked to reduce the sound absorbing function.
Therefore, the perforated plate 32 is detachably attached to the outside of the blower box 20 so that the perforated plate 32 can be removed from the blower box 20 and cleaned.

For example, the upper rail 24 is provided on the inner surface of the upper surface plate 20 of the blower box 2, the lower rail 25 is provided on the inner surface of the lower surface plate 22, and the perforated plate 32 along with the upper and lower rails 24, 25 together with the fibrous sound absorbing member 34. And slidably supported.
An opening 26 is formed on one of the left and right side portions 21b of the peripheral surface plate 21 so as to face the upper and lower rails 24, 25, and an aperture plate 32 can be inserted and extracted freely from the opening 26.
A finger hook 32 b is provided on the perforated plate 32 so that the finger hook 32 b protrudes from the opening 26.
If it does in this way, the opening board 32 can be inserted in the inside of the air blower box 2 and attached, or it can extract and remove.

In the above-described embodiment, the sound absorbing mechanism 30 is attached to the entire front surface portion 21a of the peripheral plate 21 of the blower box 2, but the sound absorbing mechanism 30 may be attached only to a part thereof.
In this case, the sound absorbing mechanism 30 can be removed from the blower box 2 by attaching the sound absorbing mechanism 30 in the above-described front surface portion 21a as a separate body and detachably attaching to the other part.

For example, as shown in FIG. 5, a mounting opening 27 is formed in the front surface portion 21a of the peripheral plate 21, and a mounting plate 28 for closing the mounting opening 27 is attached to the remaining portion of the front surface portion 21a with screws 29. The front part 21a is fixed and attached.
A sound absorbing mechanism 30 is formed by attaching a perforated plate 32 to the mounting plate 28.

In this way, the perforated plate 32 can be removed from the blower box 2 by removing the mounting plate 28 by loosening the screws 29.
Further, when the attachment plate 28 is attached by tightening the screws 29, the perforated plate 32 protrudes from the attachment opening 27 so that the perforated plate 32 can be attached in the blower box 2.

  In each of the above-described embodiments, since the sound absorbing mechanism 30 is provided on the front surface portion 21a of the peripheral surface plate 21 of the blower box 2, the perforated plate 32 faces the suction port 42 of the blower 4. Since the grommet plate 32 efficiently hits, the sound can be further absorbed and reduced.

The sound absorbing mechanism 30 can be attached to places other than those described above.
For example, it can be attached to any of the inner surface of the side surface portion 21 b of the peripheral surface plate 21 of the blower box 2, the inner surface of the upper surface plate 20, the inner surface of the lower surface plate 22, and the inner surface of the inner peripheral surface 13 of the hood body 1.
Moreover, it can attach to all the inner surfaces mentioned above, or several inner surfaces.
In this case, it can be attached over the entire surface of each inner surface, or can be attached to only a part.

In each of the above-described embodiments, the blower box 2 is attached to the upper surface of the hood 1 to form the hood body 3, but the hood body 3 may have a shape in which the hood and the blower box are integrated.
For example, as shown in FIG. 6, the hood 3 has a vertically long box shape in which the lower surface is opened by the upper surface plate 50, the front surface plate 51, the rear surface plate 52, and the left and right side surface plates 53. Thus, the suction side chamber 55 and the discharge side chamber 56 are partitioned.
The blower 4 is provided in the discharge side chamber 56 and the discharge port 43 portion protrudes upward from the upper surface plate 50 to obtain a range hood.

In the case of this range hood, the sound absorbing mechanism 30 is attached to any one or a plurality or all of the inner surface of the top plate 50, the inner surface of the front plate 51, and the inner surface of the side plate 53.
In such a case, the lower opening of the hood body 3 is large, and the sound absorbing mechanism 30 can be inserted into and removed from the hood body 3 from the lower opening of the hood body 3. By attaching 32 to the inner surface of the hood body 3 with a magnet 35, the sound absorbing mechanism 30 can be attached to or removed from the hood body 3.

  Further, the perforated plate 32 of the sound absorbing mechanism 30 of each of the above-described embodiments is rectangular, but it may be circular or any shape such as triangular, trapezoidal, polygonal.

  In short, the invention shown in each embodiment described above is a range hood in which the sound absorbing mechanism 30 is attached to the inner surface of the hood body 3.

Next, a second embodiment of the present invention will be described.
As shown in FIG. 7, the hood 1 and the blower box 2 form a hood body 3. The hood 1 is provided with a rectifying plate 16 and a filter 17, and the blower 4 is provided in the blower box 2.
That is, the shape of the hood body 3 is the same as that of the embodiment shown in FIGS.
A sound absorbing mechanism 30 is attached to the inner surface of the rectifying plate 16. The sound absorbing mechanism 30 has a structure in which an air layer 33 is placed behind the perforated plate 32.
In this embodiment, the air layer 33 is formed by the perforated plate 32 and the rectifying plate 16.
Further, a fibrous sound absorbing member 34 is provided.

  In this way, since the perforated plate 32 faces the filter 17, sound generated when air passes through the filter 17 efficiently hits the perforated plate 32, and the sound can be further reduced.

As shown in FIG. 8, the rectifying plate 16 has a substantially dish shape having rising pieces 16b continuously around the periphery of the surface plate 16a.
A hook 16c is provided at the front portion of the rising piece 16b of the flow straightening plate 16, and a hook piece 16d is provided near the rear portion. The hook 16c is locked to the inner peripheral surface plate 13 of the hood 1 and the hook piece 16d is Hook it on the peripheral plate 13 and attach it.
A projecting piece, for example, a U-shaped piece 32b is integrally provided at both ends of the opening plate 32, and the U-shaped piece 32b is in contact with the inner surface of the surface plate 16a of the rectifying plate 16, and the rising piece 16d. It is attached so as to be locked.

Next, a third embodiment of the present invention will be described.
This embodiment is a range hood provided with a curtain plate 60 as shown in FIG.
The curtain plate 60 is provided near the front surface of the hood 1 so that the blower box 2 and the exhaust duct 44 cannot be seen from the room.
The sound absorbing mechanism 30 is attached to the rear surface of the curtain plate 60 in the same manner as the attachment to the rectifying plate 16 described above.
In this way, the sound generated mainly from the exhaust duct 44 hits the perforated plate 32 of the sound absorbing mechanism 30, so that the sound can be absorbed and reduced.
The curtain plate 60 of this embodiment can be attached to the upper surface of the hood body 3 shown in FIG.

Next, a fourth embodiment of the present invention will be described.
This embodiment is a range hood in which the sound absorbing mechanism 30 is provided in the blower 4 shown in each embodiment described above.
For example, as shown in FIGS. 10 and 11, the perforated plate 32 is provided on the inner surfaces of the first side plate 45 and the second side plate 46 facing each other in the casing 40 of the blower 4 as in the above-described embodiments. An air layer 33 is formed behind it, and a fibrous sound absorbing member 34 is provided to provide a sound absorbing mechanism 30.
A substantially arc-shaped peripheral surface plate 47 is provided across the first side surface plate 45 and the second side surface plate 46 to form a casing 40, and a suction port 42 is formed in the first side surface plate 45. A discharge port 43 is formed by the second side plates 45 and 46 and the peripheral plate 47.
The fan 41 is a sirocco fan.

Further, as shown in FIGS. 12 and 13, the perforated plate 32 is provided on the inner surface of the peripheral surface plate 47 of the casing 40 as in the above-described embodiments, and the air layer 33 is formed behind the perforated plate 32. A sound absorbing member 34 is provided to provide a sound absorbing mechanism 30.
The sound absorbing mechanism 30 may be provided on the inner surfaces of the first and second side plates 45 and 46 and the inner surface of the peripheral plate 47, respectively.

Next, a fifth embodiment of the present invention will be described.
As shown in FIGS. 14 and 15, the sound absorbing mechanism 30 is attached to the inner surface of the duct cover 70.
The duct cover 70 has a front U plate 71 and left and right side plates 72 in a plane U shape, and is attached to the upper plate 10 of the hood 1 so as to cover the blower box 2 and the exhaust duct 44.
On the inner surface of the front plate 71, the sound absorbing mechanism 30 having the above-described perforated plate 32 is attached.

The sound absorbing mechanism 30 may be attached to the inner surface of the side plate 72.
Further, the duct cover 70 may be a planar rectangular shape.

  In the first embodiment described above, the sound absorbing mechanism 30 is provided on the inner surface of the hood body 3, in the second embodiment, the sound absorbing mechanism 30 is provided on the inner surface of the rectifying plate 16, and in the third embodiment, the curtain plate is provided. In the fourth embodiment, the sound absorbing mechanism 30 is provided on the inner surface of the casing 40 of the blower 4, and in the fifth embodiment, the sound absorbing mechanism 30 is provided on the inner surface of the duct cover 70. However, a plurality or all of the first to fifth embodiments may be combined.

  Moreover, although the fibrous sound absorbing member 34 is provided in each embodiment, it may not be provided.

  DESCRIPTION OF SYMBOLS 1 ... Hood, 2 ... Blower box, 3 hood body, 4 ... Blower, 16 ... Rectifier plate, 17 ... Filter, 30 ... Sound absorption mechanism, 31 ... Hole, 32 ... Open plate, 33 ... Air layer, 34 ... Fibrous Sound absorbing member, 40 ... casing, 45 ... first side plate, 46 ... second side plate, 47 ... peripheral plate, 60 ... curtain plate, 70 ... duct cover.

The present invention includes a hood body 3 having an integer Nagareban 16, a blower 4 is provided on the hood body 3, in the range hood equipped with an exhaust duct 44 communicating with the discharge port 43 of the blower 4,
The rectifying plate 16 is substantially dish-shaped having a rising piece 16b on the periphery of the surface plate 16a, and is detachably attached to the hood body 3.
An inner plate 32 provided with a plurality of holes 31 is formed on the inner surface of the surface plate 16a of the current plate 16 so that an air layer 33 is formed between the rear surface of the inner plate 32 and the inner surface of the surface plate 16. The range hood is characterized in that the sound absorbing mechanism 30 has a resonator type sound absorbing structure by being attached.

In the present invention, the filter 17 can be provided in the hood body 3 so as to face the perforated plate 32.
In this way, the sound generated when air passes through the filter 17 efficiently hits the perforated plate 32, and the sound can be further reduced.

In the present invention, protrusions are provided at both end edges of the perforated plate 32,
The projection plate 32 can be attached to the current plate 16 by contacting the inner surface of the surface plate 16 a of the current plate 16 and engaging the rising piece 16 b.

In the present invention, a fibrous sound absorbing member 34 can be provided on the back surface of the perforated plate 32.
In this way, the sound absorption rate can be increased.

In the present invention, the perforated plate 32 can have holes 31a and 31b having different diameters.
In this way, it is possible to provide a width for the frequency of sound absorption.

According to the range hood of the present invention draws air into the hood member 3 by driving the fan 4, the sound generated during operation to discharge outdoors through the exhaust duct 44, the sound absorbing mechanism attached to the inner surface of the integer Nagareban 16 Since the sound is absorbed at 30, the sound transmitted around the range hood is reduced.
Therefore, it is possible to provide a range hood with less noise generated during operation and excellent quietness.

It is a front view of the range hood which shows the reference example of this invention. It is a side view of the range hood which shows the reference example of this invention. It is an AA expanded sectional view of FIG. It is a front view of an anaaki board. It is sectional drawing of the reference example which provided the sound absorption mechanism in a part in the front part of the surrounding surface board of an air blower box. It is sectional drawing of the reference example which made the food body integral type. It is sectional drawing of the range hood which shows embodiment of this invention . It is a perspective view of the baffle plate which attached the sound absorption mechanism.

A reference example of the present invention will be described.
As shown in FIGS. 1 to 3, a hood 1 and a blower box 2 constitute a hood body 3.
The hood 1 has a concave portion 14 opened to the lower surface by an upper surface plate 10, an outer peripheral surface plate 11, a lower surface plate 12, and an inner peripheral surface plate 13, and an opening portion 15 communicating the concave portion 14 with the upper surface. Is a thin box-shaped body smaller than the front and rear dimensions and the left and right dimensions.
A rectifying plate 16 is attached in the recessed portion 14 of the hood 1, and air flows through a gap between the outer peripheral surface of the rectifying plate 16 and the recessed portion 14 (inner peripheral surface plate 13).
A filter 17 is attached to the opening 15 of the hood 1.
The blower box 2 has a box shape with an upper surface plate 20, a peripheral surface plate 21, and a lower surface plate 22, and an air intake port 23 is formed in the lower surface plate 22.
The lower surface plate 22 is placed on the upper surface plate 10 of the hood 1, and the air intake port 23 is opened to the opening 1.

In the reference example shown in FIG. 3, the perforated plate 32 is provided to be opposed to the inner surface of the front surface portion 21 a of the peripheral surface plate 21 of the blower box 2, and between the inner perforated plate 32 and the inner surface of the front surface portion 21 a. An air layer 33 is formed on the surface.
In this way, since the sound absorbing mechanism 30 can be formed with only the perforated plate 32, the number of parts can be reduced and the cost can be reduced.

As shown in FIG. 4, the perforated plate 32 of this reference example has a hole 31a having a large diameter at the outer peripheral portion, a hole 31b having a smaller diameter at the inner peripheral portion, and a diameter at the intermediate portion. A hole 31c having an intermediate size is formed.
By doing in this way, the width | variety can be provided in the frequency which absorbs sound.

In the above-described reference example , the sound absorbing mechanism 30 is attached to the entire front surface portion 21a of the peripheral plate 21 of the blower box 2, but the sound absorbing mechanism 30 may be attached only to a part thereof.
In this case, the sound absorbing mechanism 30 can be removed from the blower box 2 by attaching the sound absorbing mechanism 30 in the above-described front surface portion 21a as a separate body and detachably attaching to the other part.

In each of the above-described reference examples , since the sound absorbing mechanism 30 is provided on the front surface portion 21a of the peripheral surface plate 21 of the blower box 2, the perforated plate 32 faces the suction port 42 of the blower 4, so that the sound generated from the blower 4 is generated. Since it hits efficiently on the perforated plate 32, the sound can be further absorbed and reduced.

In each reference example described above, the blower box 2 is attached to the upper surface of the hood 1 to form the hood body 3, but the hood body 3 may have a shape in which the hood and the blower box are integrated.
For example, as shown in FIG. 6, the hood 3 has a vertically long box shape in which the lower surface is opened by the upper surface plate 50, the front surface plate 51, the rear surface plate 52, and the left and right side surface plates 53. Thus, the suction side chamber 55 and the discharge side chamber 56 are partitioned.
The blower 4 is provided in the discharge side chamber 56 and the discharge port 43 portion protrudes upward from the upper surface plate 50 to obtain a range hood.

Further, the perforated plate 32 of the sound absorbing mechanism 30 of each reference example described above is rectangular, but it may be circular or any shape such as triangular, trapezoidal, polygonal.

In short, the invention shown in each reference example described above is a range hood in which the sound absorbing mechanism 30 is attached to the inner surface of the hood body 3.

Next, an embodiment of the present invention will be described.
As shown in FIG. 7, the hood 1 and the blower box 2 form a hood body 3. The hood 1 is provided with a rectifying plate 16 and a filter 17, and the blower 4 is provided in the blower box 2.
That is, the shape of the hood body 3 is the same as that of the embodiment shown in FIGS.
A sound absorbing mechanism 30 is attached to the inner surface of the rectifying plate 16. The sound absorbing mechanism 30 has a structure in which an air layer 33 is placed behind the perforated plate 32.
In this embodiment, the air layer 33 is formed by the perforated plate 32 and the rectifying plate 16.
Further, a fibrous sound absorbing member 34 is provided.

DESCRIPTION OF SYMBOLS 1 ... Hood, 2 ... Blower box, 3 hood body, 4 ... Blower, 16 ... Rectifier plate, 17 ... Filter, 30 ... Sound absorption mechanism, 31 ... Hole, 32 ... Open plate, 33 ... Air layer, 34 ... Fibrous sound absorbing member.

Claims (9)

In the range hood provided with the hood body 3, the blower 4 and the exhaust duct 44,
A range hood, wherein a sound absorbing mechanism 30 having a resonator type sound absorbing structure in which an air layer 33 is placed behind a perforated plate 32 provided with a plurality of holes 31 is attached to the inner surface of the hood body 3. In the range hood provided with the hood body 3 having the current plate 16, the blower 4 and the exhaust duct 44,
A range hood, wherein a sound absorbing mechanism 30 having a resonator type sound absorbing structure in which an air layer 33 is placed behind a perforated plate 32 provided with a plurality of holes 31 is attached to the inner surface of the rectifying plate 16. In the range hood provided with the hood body 3, the blower 4, the exhaust duct 44, and the curtain plate 60,
A range hood, wherein a sound absorbing mechanism 30 having a resonator type sound absorbing structure in which an air layer 33 is placed behind a perforated plate 32 provided with a plurality of holes 31 is attached to the rear surface of the curtain plate 60. In the range hood provided with the hood body 3, the blower 4 and the exhaust duct 44,
A range hood, wherein a sound absorbing mechanism 30 having a resonator type sound absorbing structure in which an air layer 33 is placed behind a perforated plate 32 provided with a plurality of holes 31 is attached to an inner surface of a casing 40 of the blower 4. In the range hood provided with the hood body 3, the blower 4, the exhaust duct 44, and the duct cover 70,
A range hood, wherein a sound absorbing mechanism 30 having a resonator type sound absorbing structure in which an air layer 33 is placed behind a perforated plate 32 provided with a plurality of holes 31 is attached to the inner surface of the duct cover 70.   The current plate according to claim 2.   The curtain according to claim 3.   The blower according to claim 4.   The duct cover according to claim 5.

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