JP2014043991A - Range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deterioration of a silence effect by easily enabling maintenance and to suppress deterioration of the silence effect caused by air current, even if an active muffler is installed in a range hood including oil soot with high temperature and high humidity generated at the time of cooking.SOLUTION: A range hood comprises a microphone 15 inside a side space 14 connected to an air channel 6, and enables a side space cover 16 for partitioning the side space 14 and the air channel 6 to be engaged from inside by inserting the side space cover 16 into upper and lower grooves 17. The side space cover 16 includes: fine holes 18 smaller than the microphone 15; and a projection part 19 as a grip for removing the side space cover 16, the projection part 19 being provided below a suction port 3 side of the fine hole 18 on the air channel side and having a tip end inclined downward.

Description

  The present invention relates to a range hood provided with an active silencer 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 means for solving such a problem, there is a method of mounting an active silencer in a range hood.

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

  As an active silencer, there is known an active silencer in which a microphone is installed with a space provided in a low-speed airflow range in order to reduce the influence of the airflow in the air passage (see, for example, Patent Document 2).

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

  Conventionally, as an active silencer for a duct, as shown in a longitudinal sectional view of FIG. 6, a reference of internal original sound sequentially provided at appropriate intervals from the upstream side inside a rectangular duct 101 made of a thin steel plate. A microphone 111, a mute speaker 112, an error microphone 113, and an arithmetic controller 102 connected to each of them are known.

  In this type of apparatus, the generated sound propagating in the rectangular duct 101 together with the airflow 103 is detected by the reference microphone 111, and the arithmetic controller 102 generates a signal having a phase opposite to that of the original sound. The original sound emitted from the loudspeaker 112 to the square duct 101 is canceled and muted, the error microphone 113 monitors the internal sound, and the mute speaker 112 is set so that the output of the error microphone 113 becomes zero by the arithmetic controller 102. The reference microphone 111 and the error microphone 113 are automatically adjusted, and as shown in FIG. 7, a microphone section 104 is provided in the corner low velocity air flow range of the square duct 101.

  As a result, the reference microphone 111 and the error microphone 113 are respectively disposed in the microphone section 104 in the low-speed airflow range at the corner of the duct via the communication port 105, so that local turbulence in which the airflow in the duct is generated. In addition to not picking up the noise based on the noise, it is possible to sufficiently pick up the noise original sound that propagates the air flow, and the feedback function of the silencer is improved.

  In addition, as an active silencer, there is known an active silencer in which an obstacle is provided upstream of the microphone to reduce the influence of an air flow including exhaust gas in the air passage and the flow velocity is reduced (see, for example, Patent Document 3). .

  Hereinafter, the active silencer will be described with reference to FIG. 6 and 7, the same or similar components as those shown in FIG. 8 are indicated by the same reference numerals.

  In FIG. 8, through holes (fine holes) are formed in the wall surface at appropriate locations of the exhaust duct 201, and the sound detection unit 202 is attached to the through holes so that the exhaust gas in the exhaust duct 201 does not leak. The sound detection unit 202 is configured by a tube in which a cavity that is continuous from one end to the other end is formed so that the sound in the exhaust duct 201 can be transmitted, and the reference microphone 111 is attached to the other end of the sound detection unit 202. . A wall 204 is installed on the upstream side of the sound detection unit 202, that is, on the noise source 203 side.

  Thereby, there exists an effect | action which reduces the flow velocity of exhaust gas locally in the position where the sound detection part 202 is connected with the exhaust duct 201. FIG. Therefore, even if the exhaust gas flow rate is large in the exhaust duct 201, the flow rate of the exhaust gas locally decreases at the position where the sound detection unit 202 communicates with the exhaust duct 201. Since the sound of the noise source 203 can be detected with high accuracy, the silencing effect does not deteriorate.

JP 2005-337484 A Japanese Utility Model Publication No. 5-11198 JP 2000-120423 A

  However, in the device described in the above-mentioned conventional patent document 1, since a microphone and a speaker are not installed in an air passage through which noise generated from a ventilation fan propagates, it is difficult to obtain a sufficient silencing effect, and simple In the range hood configuration, the microphone and speaker are likely to deteriorate due to the effects of airflow including high-temperature and high-humidity smoke generated during cooking in the airway in the range hood configuration. There was a problem to do.

  In addition, in the devices described in Patent Documents 2 and 3, the microphone and the speaker are installed in an air passage through which noise propagates, and while avoiding the influence of air currents containing high-temperature and high-humidity smoke, they are used for a long time. However, there is a problem that the noise reduction effect decreases with time because the communication port is closed due to oil adhesion, or the sound detection unit is covered with oil.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object thereof is to provide a range hood provided with an active silencer that suppresses the deterioration of the silencing effect over time and the silencing effect due to airflow.

  And in order to achieve the above-mentioned object, the present invention is a hood having a discharge port installed above the heating cooker and communicating with the outdoors, and a suction port for sucking air containing oil smoke generated during cooking, A microphone is installed in a range hood equipped with a fan and motor for ventilation that exhausts the air in the air passage connecting the discharge port and the suction port to the outside, and an active silencer consisting of a microphone and a speaker. A side space connected to the air passage, and a side space cover that can be removed from the air passage side for separating the side space and the air passage, and for removing the pores penetrating the side space cover and the side space cover A convex portion as a handle is provided on the air inlet side on the air passage side, thereby achieving the intended purpose.

  According to the present invention, even if an active silencer is installed in a range hood that includes high-temperature and high-humidity smoke generated during cooking, deterioration of the silencing effect is suppressed by adopting a configuration that facilitates maintenance, and due to airflow A decrease in the silencing effect can be suppressed.

The block diagram which shows the side cross section of the range hood of Embodiment 1 of this invention Cross-sectional side view near the microphone of the same range hood Outline perspective view near the microphone of the same range hood The enlarged view of the microphone vicinity of the range hood of Embodiment 2 of this invention Outline perspective view near the microphone of the same range hood Sectional drawing which shows the conventional active silencer Side sectional view of the vicinity of a microphone of a conventional active silencer Sectional view near the microphone of a conventional active silencer

  A range hood according to claim 1 of the present invention is a hood that is installed above a cooking device and has a discharge port that communicates with the outdoors, and a suction port that sucks in air containing oil smoke generated during cooking. A microphone is installed in a range hood equipped with a ventilating fan and motor that exhausts the air in the air passage connecting the discharge port and the suction port to the outside, an active silencer composed of a microphone and a speaker. A side space connected to the air passage, a side space cover removable from the air passage side for partitioning the side space and the air passage, a pore penetrating the side space cover, and for removing the side space cover A range hood characterized in that a convex portion as a handle is provided on the air inlet side on the air passage side.

  As a result, since the microphone is installed in the side space, the influence of the air flow containing high-temperature and high-humidity smoke can be avoided, and the side space cover can be removed, so the pores that serve as the sound path are regularly opened. By washing, the pores are prevented from being blocked and deterioration of the silencing effect is suppressed, and furthermore, a convex portion exists on the upstream side of the microphone, and the flow velocity is slowed by obstructing the flow of the air current. Since the noise reduction sound can be detected with high accuracy by suppressing the pressure fluctuation due to the airflow, the reduction of the silencing effect can be suppressed.

  According to the second aspect of the present invention, since the projection shape of the handle from the airflow direction covers the width of the microphone, the airflow can be slowed down over the entire area of the microphone.

  According to a third aspect of the present invention, the side space cover is fixed to the air passage with a screw, the handle is the head of the screw, and the side space formed by the subtle vibrations of the ventilation fan and the motor being transmitted to the side space cover. By preventing the cover from vibrating and eliminating noise other than noise reduction, the noise reduction effect is less likely to occur, and at the same time, the screw head becomes a convex part upstream of the microphone, hindering the air flow and slowing down the flow speed. The noise reduction sound can be accurately detected while suppressing the pressure fluctuation due to the noise, so that the silencing effect does not deteriorate.

  Further, from claim 4, the tip of the handle is inclined to the suction port side with respect to the joint portion of the side space cover and the handle, and is inclined downward in the range hood in which the airflow flows from below to above, Even if oil droplets or water droplets flow on the wall surface of the air passage, it will follow the air passage side at the tip of the handle, preventing the oil droplets or water droplets from catching at the base of the handle and entering the side space to cover the microphone. Capability can be maintained as an active silencer even during long-term use.

  Further, according to claim 5, the surface of the side space cover is made of a hydrophilic material, and when the side space cover is washed, oil can be easily removed even by washing with water, thereby increasing the careability. it can.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1, 2, and 3.

  As shown in the side view of the range hood in FIG. 1, the range hood 1 of the present embodiment has a discharge port 2 that communicates with the outdoors and a suction port 3 that sucks air containing oil smoke generated during cooking. 4, a ventilation fan 7 that exhausts air to the outside in the air passage 6 in the hood 4 that connects the discharge port 2 and the suction port 3, a motor 8 that drives the ventilation fan 7, A filter 5 installed near the suction port 3 to remove oil dust from the sucked air, and a rectifying plate 9 installed on the upstream side of the filter 5 near the suction port 3 to facilitate air flow. is there.

  Then, the active silencer 13 attached to the range hood 1 includes a reference microphone 10 that detects noise propagating in the air passage 6 and a sound having a phase opposite to that detected by the reference microphone 10 in the air passage 6. It comprises a speaker 11 that emits, an error microphone 12 that detects noise attenuated by the sound emitted from the speaker 11 into the air passage 6, and an arithmetic controller (not shown) that connects and controls them.

  Here, as shown in FIG. 2, which is an enlarged side sectional view of the vicinity A of the reference microphone 10 and the error microphone 12, a microphone 15 (the reference microphone 10 or the error microphone 12 is installed in the side space 14 connected to the air path 6. And the side space cover 16 for partitioning the side space 14 and the air path 6 can be engaged with the upper and lower grooves 17 to be locked from the air path 6 side. A plurality of smaller pores 18 and a convex portion 19 as a handle for removing the side space cover 16 are provided below the suction port 3 side of the pore 18 on the air passage side, and the tip is inclined downward. ing.

  Further, as shown in FIG. 3, which is a schematic perspective view with the side space cover 16 removed, the projected projection width 22 from the airflow direction 21 covers the microphone width 23.

  Further, the side space cover 16 has a surface coated with a hydrophilic paint.

  With the above configuration, the air sucked from the suction port 3 passes through the air passage 6 in the order of the filter 5 and the ventilation fan 7, and is then exhausted from the discharge port 2 to the outside of the hood. For this reason, fan noise associated with air blowing is reduced and radiated from the suction port 3 connected to the living room.

  The air from the suction port 3 becomes an air flow containing high-temperature and high-humidity oil smoke, and most of the air is collected by the filter 5, but a small amount of oil smoke or the like passes through the filter 5 and enters the air passage 6. . Here, since the microphone 15 (the reference microphone 10 and the error microphone 12) is covered with the side space cover 16, it prevents the smoke from adhering to the microphone 15 and lowering the fan noise detection accuracy, and the oil smoke during long-term use. However, even when the pores 18 are blocked by being stacked inside the air passage 6, it is possible to recover the fan noise detection accuracy by removing the side space cover 16 and cleaning it.

  Moreover, since the convex part 19 attached to the side space cover 16 facilitates the removal of the side space cover 16 and the convex part 19 is provided on the upstream side of the airflow of the microphone 15, the flow of the wind is prevented. The flow velocity in the microphone vicinity space 20 becomes slower downstream of the convex portion 19, and the pressure fluctuation due to the air turbulent quickly turbulent in the vicinity of the microphone can be suppressed and the noise reduction sound can be detected with high accuracy, so that the reduction in the silencing effect can be suppressed.

  Further, since the projected shape width 22 from the airflow direction 21 covers the microphone width 23, the airflow can be slowed over the entire surface of the microphone by covering the upstream side of the entire microphone. Therefore, it is possible to improve the effect of suppressing the decrease in the silencing effect.

  Further, although the oil smoke adhering to the wall surface may flow down along the air passage inner wall surface 24 as oil droplets due to long-term use, since the tip of the convex portion 19 is inclined downward, the refractive portion 25 In addition, oil droplets flow in the direction of the arrow away from the microphone 15 at the tip of the convex portion 19 so as not to enter the side space 14 from the pore 18 and cover the microphone 15.

  The oil drops that flow can be received by the filter 5 or the current plate 9 or can be easily collected by providing an oil receiver (not shown) below the side space cover 16.

  In addition, since the hydrophilic coating is applied to the surface when cleaning the side space cover 16 to which the oil smoke has adhered, the water easily enters the space between the surface and the oil by washing with water, so that the oil can be easily removed from the side space cover 16. It can be removed and care can be increased.

  As the microphone suitable for sensing the noise of the ventilation fan 7 of the range hood, the reference microphone 10 and the error microphone 12 having a width of 10 mm or less are sufficient, so that the convex portion as a handle in this case The width of 19 is about 10 to 30 mm which is larger than the width 23 of the microphone and does not obstruct the airflow in the air passage 6, and the length of the handle is 10 to 30 mm which is easy to pinch by hand and does not obstruct the airflow in the airway 6. A degree is desirable.

  In addition, an error microphone 12 for confirming and correcting the effect of noise reduction by the speaker 11 is used as feedback control in order to increase the noise reduction accuracy. However, in a sound source in which the characteristics of the noise source are determined in advance, a reference microphone is used. 10, it is possible to control only the phase of the sound generated from the speaker 11. In this case, the error microphone 12 may not be used.

(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.

  FIG. 4 is an enlarged side sectional view of the vicinity A portion of the reference microphone 10 and the error microphone 12 of the second embodiment in FIG. 1, and FIG. 5 is a schematic perspective view with the side space cover 26 removed.

  The difference from the first embodiment is that a handle for removing the side space cover 26 is a screw head 27, and the side space cover 26 inserts the screw portion 28 into the screw hole 29, thereby allowing the air passage inner wall surface 24 to be removed. This is a fixed point.

  With the above configuration, there is a possibility that subtle vibrations may occur because the ventilation fan 7 and the motor 8 are rotating. However, since the side space cover 26 is fixed with screws, the side where vibrations propagate Since the space cover is prevented from vibrating and noise other than noise reduction is eliminated, it is difficult to reduce the noise reduction effect. At the same time, since the screw head 27 is upstream of the air flow of the microphone 15, the flow of air is prevented and the flow velocity is reduced downstream of the screw head 27 shown in the microphone vicinity space 20. Since the noise reduction sound can be detected with high accuracy by suppressing the pressure fluctuation due to the airflow, it is possible to suppress the reduction of the silencing effect.

  As the microphone suitable for sensing the noise of the ventilation fan 7 of the range hood, the reference microphone 10 and the error microphone 12 having a width within 10 mm are sufficient. The diameter is about 10 to 30 mm which is larger than the width 23 of the microphone and does not obstruct the airflow in the air passage 6, and the height of the screw head 27 is 10 to 10 so that the airflow in the airway 6 is not obstructed. A thing about 30 mm is desirable.

  The active silencer for a range hood according to the present invention obtains a sufficient silencing effect and protects the microphone and speaker from heat, moisture and oil, which cause performance deterioration, and can be used for a long time. It is useful as a silencer mounted on a ventilator under an environment or an ventilator under an environment containing oily smoke.

DESCRIPTION OF SYMBOLS 1 Range hood 2 Discharge port 3 Suction port 4 Hood 5 Filter 6 Air path 7 Ventilation fan 8 Motor 9 Current plate 10 Reference microphone 11 Speaker 12 Error microphone 13 Active silencer 14 Side space 15 Microphone 16 Side space cover 17 Groove 18 Narrow Hole 19 Protrusion 20 Microphone vicinity space 21 Airflow direction 22 Projection shape width 23 Microphone width 24 Air channel wall surface 25 Refraction part 26 Side space cover 27 Screw head 28 Screw part 29 Screw hole 101 Square duct 102 Arithmetic controller 103 Air flow 104 Microphone compartment 105 Communication port 111 Reference microphone 112 Mute speaker 113 Error microphone 201 Exhaust duct 202 Sound detector 203 Noise source 204 Wall

Claims (5)

A hood that is installed above the cooking device and has a discharge port that communicates with the outdoors, and a suction port that sucks in air containing smoke generated during cooking,
A ventilation fan and a motor for exhausting the air in the air passage connecting the discharge port and the suction port in the hood to the outside;
In a range hood equipped with an active silencer composed of a microphone (microphone) and a speaker,
A side space connected to the air passage for installing the microphone;
A side space cover removable from the air passage side for partitioning the side space and the air passage,
A range hood characterized in that a fine hole penetrating the side space cover and a convex portion as a handle for removing the side space cover are provided on the air inlet side on the air passage side.   The range hood according to claim 1, wherein the projected shape of the handle from the airflow direction is a shape that covers the width of the microphone.   The range hood according to claim 1 or 2, wherein the side space cover is fixed to the air passage with a screw, and the handle is a head of the screw.   The range hood according to claim 1 or 2, wherein a tip end portion of the handle is inclined toward the suction port with respect to a joint portion of the side space cover and the handle.   The range hood according to any one of claims 1 to 4, wherein a surface of the side space cover is formed of a hydrophilic material.

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