JP2014163570A - Range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a range hood which includes an active-type sound-muffling unit having excellent sound-muffling effect on a ventilation passage with a large duct diameter and prevents deterioration of the sound-muffling effect of the active-type sound-muffling unit due to turbulence of air flow.SOLUTION: A range hood includes an active-type sound-muffling unit 13 having a plurality of small air passages 12 formed by sectioning a part of an air passage 7 from an opening 2 below a body 6 to a ventilation fan 8 by means of an outer casing 10 and a partition member 11, and a connection member 16 connecting the partition member 11 and a distribution plate 4 in a line extending downward along the partition member 11.

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. 5, a reference microphone 102 for internal original sound, a silencer speaker 103, which are sequentially attached to the inside of the duct 101 at appropriate intervals from the upstream side, An error microphone 104 and an arithmetic 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. 6, the large-diameter duct is divided into small-diameter ducts 201, 202, 203, and 204, and a speaker 103 is installed at the same position of each of the caliber ducts. Further, the reference microphone 102 is installed upstream of the installation position of the speaker 103 and the error microphone 104 is installed downstream of the small-diameter duct 201. The noise signals detected by the reference microphone 102 and the error microphone 104 are input to the arithmetic controller 105, and the arithmetic controller 105 generates a drive signal to be output to the speaker 103 based on these noise signals, and each small aperture. This drive signal is output to the speaker 103 installed in the duct, and the noise transmitted 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 sufficient silencing effect can be obtained.

  In FIG. 6, the same or similar components as those shown in FIG. 5 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.

  Moreover, the speaker 103 installed in the small-diameter duct 201 generates crosstalk that detects the canceling sound generated by the speakers 103 installed in the other small-diameter ducts 202, 203, and 204, so that the silencing effect is reduced due to howling or the like. There is a problem.

  Therefore, the present invention solves the above-described problem, and includes an active silencing unit that has a high silencing effect on a ventilation path having a large duct diameter, and a range that suppresses a decrease in the silencing effect of the active silencing unit due to airflow disturbance. The purpose is to provide food.

  In order to achieve the above object, the present invention is installed above the heating cooker, and has a suction opening for sucking air containing oil smoke generated during cooking on the lower surface, a hood having an opening on the upper surface, and the lower end of the hood. It is composed of a rectifying plate that is detachably installed in the vicinity facing the suction port, and a rectangular parallelepiped main body having a discharge port that communicates with the opening on the top surface of the hood and communicates with the outdoors. A ventilation fan and a motor for exhausting the air in the air passage connecting the discharge port and the suction port to the outside; and a part of the air passage from the opening to the ventilation fan at a lower portion of the main body is partitioned from an outer shell An active silencer unit that divides into a plurality of small air paths by a member is provided, and the active silencer unit is provided with a microphone and a speaker in the vertical direction between the main body and the outer shell or in a space in the partition member. On the downward extension line of the partition member, the partition member has a length that is not less than the width of the partition member and not more than the opening, and has a connection member that connects the partition member and the rectifying plate, thereby It achieves its purpose.

  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 block diagram which shows the side cross section of the range hood of Embodiment 1 of this invention Sectional view of the vicinity of the active silencer unit of the same range hood Cross-sectional view near the suction port of the same range hood Cross-sectional perspective view showing the basic configuration of the same range hood Sectional drawing which shows the conventional active silencer unit Outline perspective view showing a conventional active silencer unit

  The cooker hood according to claim 1 of the present invention is installed above the heating cooker, has a suction port for sucking air containing oily smoke generated during cooking on the lower surface, a hood having an opening on the upper surface, and the vicinity of the lower end of the hood A rectifying plate that is detachably installed facing the suction port, and a rectangular parallelepiped main body having a discharge port that communicates with the opening on the upper surface of the hood and communicates outdoors. A ventilation fan and a motor for exhausting the air in the air passage connecting the outlet and the suction port to the outside; and a part of the air passage from the opening to the ventilation fan at a lower portion of the main body and a partition member The active silencer unit is divided into a plurality of small air paths, and the active silencer unit is provided with a microphone and a speaker in a vertical direction between the main body and the outer shell or in a space inside the partition member. And it has a connecting member for connecting said partition member and the current plate on the lower extension of the partition member.

  Thereby, the vortex and disturbance which arise by the branch of the airflow between the small wind paths in a suction inlet are suppressed, and the fall of the silencing effect of an active silencing unit can be suppressed by rectifying the airflow in a small wind path. Furthermore, it is possible to suppress a reduction in the silencing effect due to crosstalk in which a microphone installed in a small air passage detects a sound generated by a speaker installed in another small air passage.

  Also, the width of the vertical cross section of the connecting member is larger in the lower part than in the upper part, and by connecting the current plate with a smooth curve, the airflow flows smoothly into the small airway, and active silencing due to airflow turbulence A reduction in the silencing effect of the unit can be suppressed.

  Moreover, by forming the connection member and the partition member integrally, it is possible to prevent the turbulence of the air flow from being generated due to a gap or a step at the boundary between the connection member and the partition member, and it is possible to suppress a decrease in the silencing effect of the active silencing unit.

  Further, since the connecting member and the current plate are integrated, the connecting member can be removed at the same time as the current plate, so that the number of work steps during maintenance is reduced and the maintainability is improved. In addition, when the connecting member and the current plate are connected with a smooth curved surface, the attached oil can be easily wiped off, so that the maintainability is further improved.

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

  As shown in the side view of the range hood of FIG. 1, the range hood of the present embodiment includes a suction port 1 for sucking air containing oil smoke generated during cooking on the lower surface, and a hood 3 having an opening 2 on the upper surface, A removable rectifying plate 4 installed near the lower end of the hood 3 so as to face the suction port 1, a filter 17 installed near the opening 2 on the upper surface of the hood 3 for removing oil dust, and an upper surface of the hood 3. Ventilation that is composed of a rectangular parallelepiped main body 6 having a discharge port 5 that communicates with the opening 2 and communicates outdoors, and exhausts air in the air passage 7 that connects the discharge port 5 and the suction port 1 to the upper portion of the main body 6 to the outdoors. The fan 8 and the motor 9 and a part of the air passage 7 from the opening to the ventilation fan 8 at the lower part of the main body 6 are divided into a plurality (four in this embodiment) of small air passages 12 by the outer shell 10 and the partition member 11. Provided with active silencer unit 13 for dividing Than is.

  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.

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

  And it has the connection member 16 which connects the partition member 11 and the baffle plate 4 on the downward extension line of the partition member 11. As shown in FIG. The width of the vertical cross section of the connecting member 16 is larger in the lower part than in the upper part, and is configured to be connected to the current plate 4 with a smooth curve.

  In the present embodiment, the partition member 11 has a space for attaching the speaker 15 and the microphone 14, but the partition member may have a plate shape when the speaker or the microphone is installed on the outer shell.

  With the above-described configuration, the exhaust air sucked from the suction port 1 passes through the air passage 7 in the order of the filter 17, the small air passage 12, and the exhaust fan, and is then exhausted from the discharge port 5 to the outside of the hood 3. Since the active silencer unit is provided, the fan noise accompanying the air blowing is reduced and radiated from the suction port 1 connected to the living room.

  Here, with reference to a cross-sectional view in the vicinity of the suction port 1 of FIG.

  As shown in FIG. 3, the exhaust air sucked from the suction port 1 passes between the rectifying plate 4 and the lower surface of the hood 3 and flows into the small air passages 12. The surface of the suction port 1 that is in contact with the adjacent small air passage 12 is physically blocked.

  Accordingly, when the connecting member 16 is not provided, the small wind generated 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 flow direction in the vertical direction and flows into the small air passage 12. It is possible to suppress the occurrence of turbulence and vortices due to airflow branching in the vicinity of the path suction opening 18.

  Furthermore, the width of the vertical cross section of the connecting member 16 is larger at the lower part than at the upper part, and is configured to be connected to the current plate 4 with a smooth curve. Thereby, an airflow is smoothly flowed in into the small wind path 12, and the fall of the silencing effect of the active silencing unit 13 by the disturbance of an airflow can be suppressed.

Note that the distance between the connecting member side end 19 where the airflow branching occurs and the small air passage suction opening 18 is increased, and the airflow turbulence caused by the airflow branching at the side end portion of the connecting member 16 becomes the airflow in the small airway 12. In order to mitigate the influence, it is preferable to make the width L ₁ of the connecting member 16 larger than the width L ₂ of the partition member 11.

  From the above, the provision of the active silencing unit 13 causes turbulence and vortices in the airflow, and the generation of new noise due to this can be suppressed.

  Furthermore, since the surface which touches the adjacent small air path 12 of each small air path 12 inlet 1 by the connection member 16 is physically interrupted | blocked, from the speaker 15 discharge | released from the small air path 12 inlet 1 The canceling sound enters the other small air passage 12 by being reflected by the rectifying plate 4 and the crosstalk detected by the microphone installed in the other small air passage 12 is generated. Can be suppressed. If crosstalk occurs, it becomes a factor such as howling, and a sufficient silencing effect cannot be obtained. Therefore, suppressing the crosstalk by the connecting member 16 is effective for suppressing a decrease in the silencing effect.

  In the present embodiment, the connection member 16 is integrated with the partition member 11, but the connection member 16 may be integrated with the rectifying plate 4 as shown in FIG. At this time, since the connecting member can be removed at the same time as the current plate 4, the number of man-hours during maintenance is reduced, and since the connecting member and the current plate 4 are connected by a smooth curved surface, it is easy to wipe off the adhered oil. , Maintenance is improved.

  Incidentally, this type of range hood is originally provided with a connecting member between the hood 3 and the rectifying plate 4 in the vicinity of the four corners of the rectifying plate 4, but the connecting member may also serve as an attachment portion between the hood 3 and the rectifying plate 4. The number of parts can be reduced. Furthermore, the turbulence of the airflow generated by the connecting member can be suppressed, and the airflow flowing into the small air passage 12 can be rectified.

  In the present embodiment, the filter 17 is installed for each small air passage 12 in the vicinity of the opening 2 on the upper surface of the hood 3. However, when it is difficult to arrange and attach the filter 17, the filter 17 is provided as a single piece. Alternatively, the filter 17 may be sandwiched between the connection portion and the active silencer unit 13 or may be provided around the side surface of the connection member 16 as a cylindrical shape having a diameter larger than that of the opening 2 of the hood 3.

  The active silencing unit for a range hood according to the present invention obtains a sufficient silencing effect, suppresses the occurrence of airflow disturbance and crosstalk that cause a reduction 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 11 Partition member 12 Small air path 13 Active silencer unit 14 Microphone 15 Speaker 16 Connection member 17 Filter 18 Small wind Road suction opening

Claims (4)

Installed above the heating cooker,
A suction port for sucking air containing oily smoke generated during cooking on the lower surface, a hood having an opening on the upper surface, a removable current plate installed near the lower end of the hood facing the suction port,
A rectangular parallelepiped main body having a discharge port that communicates with the opening on the top surface of the hood and communicates with the outdoors;
A ventilation fan and a motor for exhausting the air in the air path connecting the discharge port and the suction port to the upper part of the main body to the outside;
An active silencer unit that divides a part of the air path from the opening to the ventilation fan into a plurality of small air paths by a cylindrical outer shell and a partition member at a lower part of the main body,
The active silencer unit is provided with a microphone and a speaker in a vertical direction between the main body and the outer shell or in a space in the partition member,
A range hood comprising a connecting member for connecting the partition member and the rectifying plate on a downward extension line of the partition member. The range hood according to claim 1, wherein the width of the vertical cross section of the connecting member is larger in the lower part than in the upper part, and the connecting member is connected to the current plate with a smooth curve. The range hood according to claim 1 or 2, wherein the connecting member and the partition member are integrally formed. The range hood according to claim 1 or 2, wherein the connecting member and the current plate are integrated.

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