JP6248285B2 - Range food - Google Patents

Description

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

  In recent years, range hoods installed in kitchens are required to reduce noise generated during operation. As one of means for solving such a problem, there is a method of mounting an active silencer unit in a range hood.

  Conventionally, as the active silencer unit for ducts, as shown in the cross-sectional view of FIG. 8, a reference microphone 102 for internal original sound, a silencer speaker 103, which are sequentially attached to the interior of the duct 101 at appropriate intervals from the upstream side, An error microphone 104 and an operation controller 105 connected to each of them are known (see, for example, Patent Document 1).

  In this type of device, the generated sound propagating in the duct 101 together with the air flow 106 is detected by the reference microphone 102, and the arithmetic controller 105 generates a signal having a phase opposite to that of the original sound. 103 cancels and silences the original sound emitted into the duct 101, the error microphone 104 monitors the internal sound, and the arithmetic controller 105 automatically adjusts the mute speaker 103 so that the output of the error microphone 104 becomes zero. doing.

  Such an active silencing unit silences the noise propagating in the one-dimensional sound field, and the noise propagating through the air passage can be controlled to a plane wave and up to a certain frequency band.

  However, since the frequency of the plane wave changes depending on the diameter of the duct, when the duct diameter is large, the frequency that becomes the plane wave is narrowed, and the noise in the frequency band that should be silenced cannot be assumed to be a one-dimensional sound field and is muted. I can't.

  For this reason, as an active silencer unit for large-diameter ventilation paths, the silencer ventilation path is divided into cells to form a combination of small-diameter ducts (small-diameter ducts), and noise propagated by plane waves in each small-diameter duct The frequency range of which is controlled with a wide band is known (see, for example, Patent Document 2).

  Hereinafter, the active silencer unit will be described with reference to FIG.

  As shown in FIG. 9, the large-diameter duct is divided into cells of small-diameter ducts 201, 202, 203, and 204, and a muffler speaker 103 is installed at the same position of each caliber duct. Further, in the small-diameter duct 201, a reference microphone 102 is installed upstream from the installation position of the muffler speaker 103, and an error microphone 104 is installed downstream. The noise signals detected by the reference microphone 102 and the error microphone 104 are input to the calculation controller 105. The calculation controller 105 generates a drive signal to be output to the mute speaker 103 based on these noise signals, This drive signal is output to the muffler speaker 103 installed in the small-diameter duct, and the noise propagating through each small-diameter duct is silenced by the same canceling sound.

  Thus, by dividing the large-diameter duct on the cell and combining the small-diameter duct, the frequency band propagating by the plane wave is widened, and a silencing effect can be obtained.

  In FIG. 9, the same or similar components as those shown in FIG. 8 are indicated by the same reference numerals.

Japanese Utility Model Publication No. 5-11198 JP-A-9-160567

  In general, the range hood exhausts the oily smoke generated during cooking sufficiently, so the diameter is large and the frequency characteristics of the noise of the range hood tend to be distributed over a wide area, so it is necessary to obtain a silencing effect in a wide frequency range is there. However, in the active silencer unit described in Patent Document 2, it is effective to divide the large-diameter duct into a cell shape, but vortices and turbulence occur due to the branching of the airflow between the small-diameter duct 201 at the suction port, and the silencer There exists a subject that an effect falls.

  Further, the error microphone 104 installed in the small-diameter duct 201 generates a crosstalk for detecting a canceling sound by the muffler speaker 103 installed in the other small-diameter ducts 202, 203, 204. There is a problem that decreases.

  Then, an object of this invention is to provide the range hood which suppressed the fall of the silencing effect.

  And in order to achieve this objective, the range hood which concerns on 1 aspect of this invention is the removal which installs the hood which has an inlet in a lower surface and an opening part in an upper surface, and faces the said inlet under the said hood A rectifying plate that is possible, a main body having a discharge port communicating with the opening and the outside, and an upper portion of the main body, and exhausts air in an air passage connecting the discharge port and the suction port to the outside Ventilation fan and motor, provided in the lower part of the main body, provided between the active silencer unit for silencing the sound generated by the ventilation fan, the opening and the rectifier plate, from the suction port A rectifying member comprising a first member and a second member for rectifying the sucked air; and a filter provided between the rectifying member and the opening, wherein the active silencing unit is connected to the ventilation through the opening. For fans An outer frame that divides a part of the air passage into a plurality of small air passages, a partition member provided inside the outer frame, and a space formed between the main body and the outer frame or formed by the partition member. A microphone and a speaker arranged facing the small air passage, and the filter has a first inclined portion inclined with respect to a horizontal plane, and is provided upstream of the suction opening of the small air passage. The first member forms a box-shaped oil catch portion that opens upward, and is provided on the lower extension line of the partition member and on the lower extension line of the lower end of the first inclined portion of the filter. In this way, the intended purpose is achieved.

  According to the present invention, even if an active silencing unit divided into small-diameter ducts is installed in the range hood, the reduction in the silencing effect is suppressed by a configuration that suppresses the occurrence of air turbulence and vortices, In addition, it is possible to suppress a decrease in the silencing effect due to crosstalk.

The figure which shows the side cross section of the range hood of Embodiment 1 of this invention. Cross-sectional view of the active silencer unit of the same range hood Perspective view of rectifying member of same range hood Perspective view of the same range hood Perspective view of the same range hood Enlarged view showing the side section of the same range hood Diagram explaining sound absorbing structure of perforated plate The schematic diagram explaining the sound absorption structure of the range hood of Embodiment 2 of this invention Sectional drawing which shows the conventional active silencer unit Outline perspective view showing a conventional active silencer unit

  A range hood according to one aspect of the present invention includes a hood having a suction port on a lower surface and an opening on an upper surface, a removable rectifying plate installed facing the suction port under the hood, the opening, and A main body having a discharge port communicating with the outdoors, a ventilation fan and a motor that are provided inside the upper portion of the main body and exhausts the air in the air passage connecting the discharge port and the suction port to the outside; and An active silencer unit that silences the sound generated by the ventilation fan, and a first member that is provided between the opening and the rectifying plate to rectify the air sucked from the suction port. And a rectifying member comprising a second member, and a filter provided between the rectifying member and the opening, wherein the active silencing unit is a part of the air path from the opening to the ventilation fan. Into multiple small wind paths An outer frame and a partition member provided inside the outer frame, and a microphone and a speaker disposed between the main body and the outer frame or in a space formed by the partition member and facing the small air path The filter has a first inclined portion inclined with respect to a horizontal plane, is provided upstream of the suction opening of the small air passage, and the first member has a box shape with an upper opening. An oil catch portion is formed, and is provided on a lower extension line of the partition member and on a lower extension line of a lower end of the first inclined portion of the filter.

  According to this configuration, since the oil catch portion also serves as a rectifying member, air sucked from the suction port can be rectified by the rectifying member including the oil catch portion and the second member. Can be suppressed. For this reason, even if an active silencer unit divided into small-diameter ducts is installed in the range hood, it is possible to suppress the deterioration of the silencing effect by suppressing the generation of turbulence and vortices, and crosstalk. It is also possible to suppress a decrease in the silencing effect due to.

  The second member may be provided on a lower extension line of the partition member so as to avoid a place where the oil catch portion is provided.

  According to this configuration, the second member can rectify the airflow satisfactorily as a rectifying member. For this reason, generation | occurrence | production of the noise by non-rectification in an air path can be suppressed, and an active silencer unit can be operated more effectively. As a result, the silencing effect can be further enhanced.

  Further, the upper surface of the second member may have a second inclined portion that is inclined along the first inclined portion of the filter.

  According to this configuration, the distance between the filter and the upper surface of the second member can be made almost constant, so that the exhaust air sucked from the suction port flows smoothly into the small air passage. Thus, since the second member can satisfactorily rectify the airflow as the rectifying member, it is possible to suppress the generation of noise due to non-rectification in the air passage and to operate the active silencing unit more effectively. As a result, the silencing effect can be further enhanced.

  Further, the second member may be configured by a box-shaped resonance space portion having an opening on the upper side.

  According to this configuration, the silencing effect can be further enhanced by using the second member as the resonance space portion.

  The upper surface of the second member has a second inclined portion that is inclined along the first inclined portion of the filter, and the lower surface of the second member is not parallel to the second inclined portion, The second member may be configured by a box-shaped resonance space portion having an opening on the upper side.

According to this configuration, the length L between the filter and the lower surface of the resonance space portion has a different value depending on the location. If the length L has a different value, the resonance frequency f ₀ also has a different value. For this reason, it is possible to expand the frequency band (frequency band of the resonance frequency f ₀ ) that can be silenced from the resonance space. As a result, the silencing effect can be enhanced in a wider frequency band.

  Further, the filter may be provided with a plurality of holes, and the upper surface of the second member made of the resonance space portion may be in contact with the filter.

According to this configuration, the actual resonance frequency can be made closer to the resonance frequency f ₀ , so that the silencing effect by the resonance space can be further enhanced.

  Further, the filter may be provided with a plurality of holes, and a gap may be provided between the filter and the partition member on an upper extension line of the resonance space portion.

  According to this configuration, the filter and the partition member are not in contact with each other, and a clearance is provided between the filter and the partition member, so that the resonance vibration of air generated in the resonance space portion passes through the hole of the filter and the suction port of the hood. It is transmitted in the air path between the openings. Since this resonance vibration has a silencing effect, the silencing effect of the range hood can be enhanced.

  Further, when the microphone is provided in a space in the partition member, the lower surface of the partition member provided with the microphone may be sealed.

  According to this configuration, when the lower surface of the partition member is sealed, a part of the airflow can be prevented from entering the space in the partition member from the lower surface of the partition member. As a result, noise generation in the partition member is suppressed, and the microphone provided in the space in the partition member helps to detect sound normally. For this reason, the silencing effect of the active silencing unit can be enhanced.

  Further, the oil catch portion may be configured not to contact the filter.

  According to this configuration, oil collected by gravity at the lower end of the first inclined portion of the filter can be effectively recovered by the oil catch portion.

  In addition, the second member includes two box-shaped resonance spaces having an opening on the upper side, and the first member is on a bottom surface of the second member, and includes the two resonance spaces. You may make it the structure installed in between.

  According to this configuration, the opening area of the upper surface of the oil catch portion 21 can be increased, and the oil 52 dripping from the lower end 51 of the filter 19 can be effectively recovered by the oil catch portion 21.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5, and 6.

(Embodiment 1)
As shown in the side view of the range hood of FIG. 1, the range hood of the present embodiment is a range hood installed above the heating cooker, and includes a hood 3, a current plate 4, a main body 6, A ventilation fan 8 and a motor 9, an active silencing unit 13, a filter 19, and a rectifying member 16 are provided.

  The active silencer unit 13 is a unit including the outer frame 10, the partition member 11, the microphone 14, and the speaker 15.

  The hood 3 has a suction port 1 on the lower surface and an opening 2 on the upper surface. Air containing smoke generated during cooking is sucked from the suction port 1.

  The rectifying plate 4 is installed under the hood 3 or near the lower end so as to face the suction port 1 and can be detached from the hood 3.

  The main body 6 has an opening 2 and a discharge port 5 communicating with the outdoors. The main body 6 is preferably a rectangular parallelepiped.

  The ventilation fan 8 and the motor 9 are provided inside the upper portion of the main body 6 and exhaust the air in the air passage 7 connecting the discharge port 5 and the suction port 1 to the outside.

  The outer frame 10 and the partition member 11 provided inside the outer frame 10 are provided inside the lower portion of the main body 6, and a plurality of (for example, four) air passages 7 from the opening 2 to the ventilation fan 8 are provided. ). The outer frame 10 is preferably cylindrical.

  Here, the lower portion of the main body 6 refers to a portion below the upper portion of the main body 6. The upper part of the main body 6 refers to a part above the lower part of the main body 6.

  The microphone 14 and the speaker 15 are preferably mounted for each small air passage 12. The microphone 14 and the speaker 15 are provided in the vertical direction between the main body 6 and the outer frame 10 or in the space inside the partition member 11, and face the small air passage 12. Installed.

  The active silencer unit 13 attached to the range hood silences the microphone 14 that detects noise propagating in the air passage 7 and releases the sound in the opposite phase to the noise detected by the microphone 14 into the air passage 7. The speaker 15 is composed of an arithmetic controller (not shown) that connects and controls them.

  The filter 19 is installed near the opening 2 on the upper surface of the hood 3 and removes oil dust from the sucked air. The filter 19 is provided upstream of the suction opening 20 of the small air passage 12 and has a first inclined portion 31 that is inclined with respect to the horizontal plane. The lower end of the first inclined portion 31 is preferably provided so as to be lowest at a position on the downward extension line of the partition member 11. The filter 19 is made of metal, provided with a plurality of punch holes (diameter 1 to 10 mm or 2 to 4 mm), and is fixed to the outer frame 10 or the like.

  The rectifying member 16 includes a first member 17 and a second member 18 that rectify air sucked from the suction port 1. The first member 17 and the second member 18 are provided between the opening 2 and the current plate 4.

  The first member 17 is a box-shaped oil catch portion 21 having an opening upward. The second member 18 is preferably composed of the resonance space portion 22. The resonance space 22 will be described later in the second embodiment. The upper surface of the second member 18 preferably has a second inclined portion 32 that is inclined along the first inclined portion 31 of the filter 19.

  FIG. 2 is a cross-sectional view of the active silencer unit 13 of the range hood. A part of the air path 7 from the opening 2 to the ventilation fan 8 is formed into a plurality of small air paths 12 by the outer frame 10 and the partition member 11. It is divided.

  FIG. 3 is a perspective view of the rectifying member 16 of the range hood. The first member 17 and the second member 18 are coupled to each other as shown in FIG. For this reason, in this Embodiment, it corresponds to the small wind path 12 divided into four.

  4 and 5 are perspective views of the range hood.

  As shown in FIGS. 4 and 5, the rectifying plate 4, the rectifying member 16, the filter 19, the hood 3, and the main body 6 are arranged in this order.

  The second member 18 is fixed to the hood 3 or the outer frame 10 by fixing the fixing portion 41 of the second member 18 to the fixing portion 42 provided on the hood 3 or the outer frame 10.

  FIG. 6 is an enlarged view of the vicinity of the straightening member 16 in the side view of the range hood of the present embodiment.

  As shown in FIG. 6, the range hood is on the lower extension line of the partition member 11 and on the lower extension line of the lower end 51 of the first inclined portion 31 of the filter 19, and the first member 17 (oil catch portion 21). A rectifying member 16 is provided.

  With the above configuration, the exhaust air sucked from the suction port 1 passes through the air passage 7 in the order of the filter 19, the small air passage 12, and the ventilation fan 8, and then exhausts from the discharge port 5 to the outside of the hood 3. Is done.

  And since the active silencer unit 13 is provided, the fan noise accompanying ventilation will be reduced and radiated | emitted from the suction inlet 1 connected to a living room.

  Here, with reference to FIG. 6, an explanation will be given of actions and effects in which a reduction in the silencing effect is suppressed by the flow regulating member 16.

  As shown in FIG. 6, the exhaust air sucked from the suction port 1 passes between the rectifying plate 4 and the lower surface of the hood 3, passes through the filter 19, and flows into the small air passage 12. The matching small air passage 12 is physically blocked by the flow straightening member 16 in the vicinity of the suction opening 20 of the small air passage 12.

  When the rectifying member 16 is not provided, when the exhaust air that has passed in the horizontal direction between the rectifying plate 4 and the lower surface of the hood 3 changes the direction of flow in the vertical direction and flows into the small air passage 12, the small air passage In the vicinity of the twelve suction openings 20, turbulence and vortices are generated due to the branching of the airflow.

  However, according to the range hood of this Embodiment, since the rectification | straightening member 16 is provided, generation | occurrence | production of such turbulence of airflow and generation | occurrence | production of a vortex can be suppressed. As a result, it is possible to suppress the generation of new noise due to the turbulence of airflow and the generation of vortices.

  Furthermore, since each adjacent small air path 12 is physically interrupted by the rectifying member 16 in the vicinity of the suction opening 20 of the small air path 12, it is discharged from the suction opening 20 of the small air path 12. It is possible to suppress the canceling sound from the speaker 15 from entering the other small air passage 12 by being reflected by the rectifying plate 4 or the like.

  As a result, it is possible to suppress the occurrence of crosstalk in which this canceling sound is detected by the microphone 14 installed in another small air passage 12.

  If crosstalk occurs, it becomes a factor such as howling, and a sufficient silencing effect cannot be obtained. Therefore, suppressing the crosstalk by the rectifying member 16 is effective for suppressing a decrease in the silencing effect.

  Furthermore, the feature of the range hood of the present embodiment is that the first member 17 constituting the rectifying member 16 is an oil catch portion 21.

  Usually, when providing an oil catch part in a range hood, an oil catch part is provided under a filter so that oil dripping may be collected. However, the inside of the range hood is an air passage, and if an oil catch portion is provided in the air passage, the air flow in the air passage is often disturbed by the oil catch portion. If the air flow is disturbed, the silencing effect of the active silencing unit is reduced.

  On the other hand, in the range hood of the present embodiment, the first member 17 (oil catch portion 21) is on the lower extension line of the partition member 11 and on the lower extension line of the lower end 51 of the first inclined portion 31 of the filter 19. A rectifying member 16 is provided.

  With this configuration, the air sucked from the suction port can be rectified by the rectifying member 16 including the oil catch portion 21 and the second member 18. For this reason, since the turbulence and vortex generation by the oil catch portion 21 can be suppressed, oil dripping from the lower end of the filter 19 by the oil catch portion 21 while suppressing the turbulence and vortex generation in the air passage 7. 52 can be effectively recovered.

  Moreover, it is preferable that the 2nd member 18 is provided on the downward extension line of the partition member 11 so that the place where the oil catch part 21 was provided may be avoided.

  With this configuration, the exhaust air sucked from the suction port 1 flows smoothly into the small air passage 12. As a result, the turbulence of airflow and the generation of vortices are further suppressed, and the silencing effect of the active silencing unit 13 can be further enhanced.

  Further, the upper surface of the second member 18 preferably has a second inclined portion 32 that is inclined along the first inclined portion 31 of the filter 19.

  With this configuration, the distance between the filter 19 and the upper surface of the second member 18 can be made substantially constant, so that the exhaust air sucked from the suction port 1 flows smoothly into the small air passage 12. As a result, the turbulence of airflow and the generation of vortices are further suppressed, and the silencing effect of the active silencing unit 13 can be further enhanced.

(Embodiment 2)
Next, the range hood of the second embodiment will be described. In the first embodiment, the second member 18 does not necessarily have the resonance space portion 22. However, in the second embodiment, when the second member 18 includes the resonance space portion 22, the noise reduction effect is achieved by the rectifying member 16. The action and effect of suppressing the decrease will be described.

  Since the structure of the range hood of this Embodiment 2 is the same as that of Embodiment 1 demonstrated in FIGS. 1-6, the detailed description is abbreviate | omitted about the content demonstrated in Embodiment 1. FIG.

  First, the sound absorbing structure of a perforated plate will be described with reference to FIG. 7a (Source: “Practical noise and vibration control handbook for field practitioners and designers” P. 305 to 306 (Publisher: N Corporation)・ TS)).

  FIG. 7 a is a cross-sectional view of the perforated plate 71 installed in the vicinity of the wall 74. A hole 72 is formed in the perforated plate 71. There is an air layer 73 between the perforated plate 71 and the wall 74.

  Such a perforated plate 71 constitutes a perforated plate sound absorbing structure integrally with the air layer 73 behind, and exhibits a sound absorbing characteristic as a resonance type sound absorbing structure.

Assuming that the air layer 73 behind has a normal thickness (up to about 20 cm), the resonance frequency f ₀ (Hz) at this time is as follows.

f ₀ = c / (2π) × √ (p / (t + 0.8d) L)
Here, c: speed of sound in the air (cm / s), t: plate thickness (cm) of the perforated plate 71, d: diameter (cm) of the hole 72, L: between the perforated plate 71 and the wall 74 , That is, the thickness (cm) of the air layer 73, p: the hole area ratio (p = πd ² / 4D ² , where D: the pitch cm of the holes 72).

With respect to the sound having the resonance frequency f ₀ of this system, the air in the hole 72 vibrates vigorously, and the sound energy is absorbed by the friction loss with the tube wall near the hole 72.

  FIG. 7 b is a schematic diagram for explaining the sound absorption structure of the range hood according to the second embodiment.

  The perforated plate 71, the hole 72, the air layer 73, and the wall 74 of FIG. 7a are respectively the filter 19, the punch hole of the filter 19, the air layer inside the resonance space 22, the lower surface of the resonance space 22, or Corresponds to the bottom.

The resonance frequency f ₀ can also be obtained by the configuration of the present embodiment shown in FIG. 7b. In the equation of resonance frequency f ₀ , t: plate thickness (cm) of filter 19, d: diameter of punch hole of filter 19 (cm), L: length between filter 19 and lower surface of resonance space 22 That is, the thickness (cm) of the air layer inside the resonance space 22, p: the hole area ratio (p = πd ² / 4D ² ), and D: the pitch (cm) of the punch holes of the filter 19.

Thus, the range hood according to the second embodiment, the second member 18 constituting the rectifying member 16, because it is made of the resonance space 22 of the box-shaped having an opening upward, the resonance frequency f ₀ The air in the punch hole portion of the filter 19 vibrates violently with respect to the sound, and the sound energy is absorbed by the friction loss with the tube wall near the punch hole of the filter 19. As a result, the silencing effect can be further enhanced. In addition, the length L between the filter 19 and the lower surface of the resonance space portion 22 is different from that in FIG. 7B, and a silencing effect can be obtained even if the length L is constant regardless of the location. However, the length L between the filter 19, which is a perforated plate, the resonance space 22 and the lower surface is an important value in determining the resonance frequency.

  Further, the upper surface of the resonance space portion 22 has a second inclined portion 32 that is inclined along the first inclined portion 31 of the filter 19, and the lower surface of the resonance space portion 22 is not parallel to the second inclined portion 32. preferable. For example, the lower surface of the second member 18 may be substantially parallel to the horizontal plane.

With this configuration, the length L between the filter 19, the resonance space 22 and the lower surface is not constant, and the length L has a predetermined range (a value having a predetermined width). In other words, the length L has a different value depending on the place. If the length L has a different value, the resonance frequency f ₀ also has a different value. For this reason, the frequency band of the resonance frequency f ₀ can be expanded. As a result, a silencing effect can be obtained in a wider frequency band.

  The filter 19 is preferably provided with a plurality of holes such as punch holes, and the upper surface of the second member 18 formed of the resonance space 22 and the filter 19 are preferably in contact with each other.

With this configuration, the actual resonance frequency can be made closer to the resonance frequency f ₀ , so that the silencing effect by the resonance space 22 can be further enhanced.

  Moreover, it is preferable to have a gap between the filter 19 and the partition member 11 on the upper extension line of the resonance space portion 22.

  Thus, the filter 19 and the partition member 11 are not in contact with each other, and a gap is provided between the filter 19 and the partition member 11 so that the resonance vibration of air generated in the resonance space portion 22 passes through the hole of the filter 19 and the hood. 3 is effectively transmitted into the air passage 7 between the suction port 1 and the opening 2. Since this resonance vibration has a silencing effect, the silencing effect of the range hood can be further enhanced.

  As described above, according to the second embodiment, since the second member 18 is made of the resonance space portion 22, a range hood that further enhances the silencing effect can be obtained.

  The contents related to both the first and second embodiments will be described below.

  As shown in FIG. 1, when the microphone 14 is provided in the space inside the partition member 11, it is preferable to seal the lower surface of the partition member 11 provided with the microphone 14.

  As described above, when the lower surface of the partition member 11 is sealed, a part of the airflow can be prevented from entering the space in the partition member 11 from the lower surface of the partition member 11. Thereby, since noise generation in the partition member 11 is suppressed, the microphone 14 provided in the space in the partition member 11 can easily detect sound normally. For this reason, the silencing effect of the active silencing unit 13 can be further enhanced.

  Moreover, it is preferable that the oil catch part 21 does not contact the filter 19.

  With this configuration, oil collected by gravity at the lower end 51 of the first inclined portion 31 from a wide range of the filter 19 can be effectively recovered by the oil catch portion 21.

  Further, as shown in FIG. 3 and the like, the first member 17 is preferably installed on the bottom surface of the second member 18 and between the two resonance spaces 22.

  With this configuration, the opening area of the upper surface of the oil catch portion 21 can be increased, and the oil 52 dripping from the lower end 51 of the filter 19 can be effectively recovered by the oil catch portion 21.

  Further, in this embodiment, the partition member 11 has a space for attaching the speaker 15 and the microphone 14, but when the speaker or microphone is installed in the outer frame, the partition member may have a plate shape.

  Further, although the second member 18 is composed of the resonance space portion 22, the second member 18 is not limited to the resonance space portion 22. Even if the second member 18 does not have the resonance space portion 22, the first member 17 that is the oil catch portion 21 becomes the rectifying member 16, so that a reduction in the silencing effect of the active silencing unit 13 can be suppressed.

  Moreover, although it is preferable that the upper surface of the 2nd member 18 has the 2nd inclination part 32, it does not necessarily need to have the 2nd inclination part 32. FIG.

  Moreover, although the expression of the 1st inclination part 31 and the 2nd inclination part 32 was used, the 1st inclination part 31 and the 2nd inclination part 32 include an inclined surface. Alternatively, instead of the first inclined portion 31 and the second inclined portion 32, an inclined surface may be used.

  Moreover, although it is preferable that the 2nd member 18 has the resonance space part 22 by opening an upper surface, it is not necessary to open an upper surface.

  Moreover, although the rectification | straightening member 16 was made into the shape of a cross, it does not necessarily become a cross shape. The shape of the rectifying member 16 changes as the number of divided portions and the divided shape of the small air passage 12 are changed.

  Moreover, although the 1st member 17 and the 2nd member 18 of the rectification | straightening member 16 are isolate | separated, you may integrate.

  The active silencing unit for a range hood according to the present invention obtains a sufficient silencing effect, suppresses air current disturbance and crosstalk that cause a decrease in the silencing effect, and faces the suction port with a large diameter. It is useful as a silencer mounted on a ventilation device having a panel member.

DESCRIPTION OF SYMBOLS 1 Suction port 2 Opening part 3 Hood 4 Rectifier 5 Discharge port 6 Main body 7 Air path 8 Ventilation fan 9 Motor 10 Outer frame 11 Partition member 12 Small air path 13 Active silencer unit 14 Microphone 15 Speaker 16 Rectifier member 17 First member 18 Second member 19 Filter 20 Suction opening 21 Oil catch portion 22 Resonance space portion 31 First inclined portion 32 Second inclined portion 41 Fixed portion 42 Fixed portion 51 Lower end 52 Oil 71 Perforated plate 72 Hole 73 Air layer 74 Wall

Claims (10)

A hood having a suction port on the lower surface and an opening on the upper surface;
A removable rectifying plate installed under the hood facing the suction port;
A body having a discharge port communicating with the opening and the outside;
A ventilation fan and a motor that are provided in the upper part of the main body and exhaust the air in the air passage connecting the discharge port and the suction port to the outside; and
An active muffler unit provided in the lower part of the main body to mute the sound generated by the ventilation fan;
A rectifying member comprising a first member and a second member provided between the opening and the rectifying plate and rectifying air sucked from the suction port;
A filter provided between the flow straightening member and the opening,
The active silencer unit is:
An outer frame that divides a part of the air path from the opening to the ventilation fan into a plurality of small air paths, and a partition member provided inside the outer frame;
A microphone and a speaker provided between the main body and the outer frame or in a space formed by the partition member and arranged facing the small air passage, and the filter is inclined with respect to a horizontal plane A first inclined portion, provided upstream of the suction opening of the small air passage;
The first member forms a box-shaped oil catch portion that opens upward, and is provided on a lower extension line of the partition member and on a lower extension line of the lower end of the first inclined portion of the filter. A range hood characterized by The range hood according to claim 1, wherein the second member is provided on a lower extension line of the partition member so as to avoid a place where the oil catch portion is provided. The range hood according to claim 2, wherein an upper surface of the second member has a second inclined portion inclined along the first inclined portion of the filter. The said 2nd member consists of a box-shaped resonance space part which has an opening upwards, The range hood of Claim 2 characterized by the above-mentioned. The upper surface of the second member has a second inclined portion that is inclined along the first inclined portion of the filter,
The lower surface of the second member is not parallel to the second inclined portion,
The said 2nd member consists of a box-shaped resonance space part which has an opening upwards, The range hood of Claim 2 characterized by the above-mentioned. The filter is provided with a plurality of holes,
The range hood according to claim 4 or 5, wherein the upper surface of the second member formed of the resonance space portion and the filter are in contact with each other. The filter is provided with a plurality of holes,
The range hood according to any one of claims 4 to 6, wherein a gap is provided between the filter and the partition member on an upper extension line of the resonance space portion. The range hood according to any one of claims 1 to 7, wherein when the microphone is provided in a space in the partition member, a lower surface of the partition member provided with the microphone is sealed. The range hood according to any one of claims 1 to 8, wherein the oil catch portion does not contact the filter. The second member consists of two box-shaped resonance spaces having an opening on the upper side,
The range according to any one of claims 1 to 9, wherein the first member is disposed on a bottom surface of the second member and between the two resonance spaces. hood.

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