JP6405533B2 - Range food - Google Patents

Description

  The present invention relates to a range hood with reduced noise.

  In recent years, with the diversification of the layout of a residence, cases where a kitchen and a living room are provided in the same space are increasing. Accordingly, in order to prevent noise from entering the living room and maintain quietness, the range hood installed in the kitchen is more demanded to reduce noise generated during operation.

  As one means for solving such a problem, it is known to mount an active silencer unit in a range hood. (For example, refer to Patent Document 1).

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

As shown in FIG. 7 , the conventional range hood includes a blower 102 in the upper portion of the range hood 101, an active noise unit 103 in the middle position, and a hood 104 in the lower portion. In such a range hood 101, an air passage 107 is formed between the suction port 105 of the blower 102 and the opening 106 of the hood 104, and the active noise device 103 is disposed in the air passage 107.

  In the active silencer 103, the noise detection microphone 108 and the speaker 109 are arranged in this order from the side close to the suction port 105.

  Then, noise generated by the operation of the blower 102 is detected by the noise detection microphone 108, and a sound having a phase opposite to that of the detected noise is emitted from the speaker 109 to cancel the noise in the air passage 107 to reduce the noise. Met.

  Further, the flow straightening plate 110 is horizontally disposed in the opening 106 of the hood 104 in order to sufficiently collect the oil smoke generated during cooking by increasing the flow rate.

JP 2014-055726 A

  However, in the range hood described in Patent Document 1, for example, the suction port 105 that is the opening on the blower side of the active silencer 103 and the opening 106 on the hood side have a uniform distance from the rectifying plate 110. For this reason, it was confirmed that the inside of the range hood became a resonance space and a standing wave was generated. Then, it has been found that due to the influence of the standing wave, a node occurs at a specific frequency at the position of the noise detection microphone 108, and noise cannot be detected accurately.

  That is, there has been a problem that the silencing effect is lowered due to the influence of standing waves generated by openings and flat plates with a uniform distance.

  Therefore, the present invention solves the above-described problems, and an object of the present invention is to provide a range hood that improves the silencing effect of the active silencing device.

  In order to achieve the above object, the present invention provides a range hood comprising a hood portion that collects air on the upstream side in the air flow direction, and an exhaust portion that exhausts air collected by the hood portion. The exhaust section includes a suction port that sucks air into the upstream side, a discharge port that discharges air sucked from the suction port, an air passage that communicates the suction port and the discharge port, and A blower that is provided inside the air passage and guides air from the suction port to the discharge port; an active silencing air passage that is provided inside the air passage and on the upstream side of the blower; and in the active silencing air passage An active silencer that performs silencing, and the hood portion has a downstream opening communicating with the suction port, and an upstream side having a larger area than the downstream opening provided on the upstream side of the downstream opening An opening, and the upstream opening and the bottom A rectifying plate provided with a back surface inclined with respect to the suction port between the side openings, and an inner periphery of the upstream opening and an outer periphery of the rectification plate. It is provided with a collection port serving as an intake port, thereby achieving the intended purpose.

  ADVANTAGE OF THE INVENTION According to this invention, the range hood which reduced the influence of the standing wave in range hood internal space can be provided.

The figure which shows the installation state of the range hood which concerns on Embodiment 1 of this invention. Side sectional view of the same range hood Side sectional view of the active silencer of the same range hood Side sectional view showing the configuration around the hood of the same range hood Side sectional view of the range hood according to Embodiment 2 of the present invention. Sectional view in plan view of the same range hood Side view of a conventional range hood

  The range hood according to the embodiment of the present invention is a range hood that includes a hood portion that collects air on the upstream side in the air flow direction, and an exhaust portion that exhausts the air collected by the hood portion. The exhaust section includes a suction port that sucks air into the upstream side, a discharge port that discharges air sucked from the suction port, a ventilation path that communicates the suction port and the discharge port, and the ventilation A blower that is provided inside the passage and guides air from the suction port to the discharge port, an active silencing air passage that is provided inside the air passage and upstream of the blower, and a silencing in the active silencing air passage The hood portion includes a downstream opening communicating with the suction port, and an upstream opening having a larger area than the downstream opening provided on the upstream side of the downstream opening. And the upstream opening and below A rectifying plate provided with a back surface inclined with respect to the suction port between the side openings, and an inner periphery of the upstream opening and an outer periphery of the rectification plate. It has a collection port that serves as an intake port. Accordingly, the distance between the opening on the blower side of the active silencer or the opening on the hood side and the back surface of the rectifying plate is not uniform, and the distance can be varied depending on the position, and a standing wave is generated in the internal space of the range hood. This can be prevented. Therefore, a specific frequency node is not generated at the position of the noise detection microphone of the active noise device, noise can be detected accurately, and the noise reduction effect of the active noise reduction device can be improved.

  Moreover, the range hood which concerns on embodiment of this invention WHEREIN: The said food | hood part is a substantially rectangular shape, and the said baffle plate is provided with the front which is the back surface of the said back also inclining with respect to the said suction inlet, The collection port is such that the collection port on the predetermined side surface of the hood portion is smaller than the collection port on the opposite side of the predetermined side surface.

  As a result, the pressure loss of the collection port on the predetermined side surface of the hood portion becomes larger than the pressure loss of the collection port on the predetermined side surface, so that the oil smoke is more easily sucked from the collection port on the predetermined side surface. Become. That is, the inflow amount of the oil smoke sucked from the predetermined side surface side can be reduced, and exposure of the space around the upstream opening on the predetermined side surface side to the oil smoke can be suppressed.

  Moreover, the range hood which concerns on embodiment of this invention WHEREIN: The said food | hood part is a substantially rectangular shape, and the said baffle plate is provided with the front which is the back surface of the said back also inclining with respect to the said suction inlet, The distance between the downstream opening and the collecting port on the predetermined side surface of the hood portion is longer than the distance between the collecting port on the predetermined side surface of the hood portion.

  Thereby, the pressure loss from the collection port on the predetermined side surface of the hood portion to the downstream side opening portion of the hood portion becomes larger than the pressure loss from the collection port on the predetermined side surface to the downstream side opening portion of the hood portion. The oily smoke is more easily sucked from the collection port at the predetermined side face. That is, the inflow amount of the oil smoke sucked from the collection port on the predetermined side surface can be reduced, and exposure of the space around the upstream side opening on the predetermined side surface side to the oil smoke can be suppressed.

  Moreover, the range hood which concerns on embodiment of this invention is arrange | positioned at the said predetermined | prescribed side surface with the operation part which operates the said air blower.

  Thereby, since the cook will operate and cook a range hood on the predetermined side surface with a smaller amount of inflow of oil smoke, exposure to oil smoke can be suppressed.

  Further, in the range hood according to the embodiment of the present invention, the active silencing air passage has a rectangular tube shape, and the active silencing device includes an upstream microphone, a speaker, and a downstream microphone in this order from the upstream side, An upstream microphone and a speaker are provided on the inner surface of the active silencing air path that is close to the predetermined side surface of the hood portion.

  As a result, the inflow amount from the collection port on the predetermined side surface is smaller than the inflow amount from the collection port on the opposite side of the predetermined side surface, so that the inner surface near the predetermined side surface is near the suction port of the exhaust part. Since the airflow at is a sparser state than the airflow at the inner surface where the distance between the predetermined side faces is close, the airflow that touches the upstream microphone and the speaker can be reduced. As a result, dirt adhering to the error microphone and the speaker can be reduced, and the silencing effect can be maintained for a long time.

  In the range hood according to the embodiment of the present invention, the rectifying plate has a substantially U-shaped folding structure in a cross-sectional view, and is bent in the folding structure on the upstream extension of the downstream opening. The part is arranged.

  Accordingly, the distance between the opening on the blower side of the active silencer or the opening on the hood side and the back surface of the rectifying plate is not uniform, and the distance can be varied depending on the position, and a standing wave is generated in the internal space of the range hood. This can be prevented. Therefore, a specific frequency node is not generated at the position of the noise detection microphone of the active noise device, noise can be detected accurately, and the noise reduction effect of the active noise reduction device can be improved.

  In the range hood according to the embodiment of the present invention, the active silencing air passage is divided into at least two by a separation plate parallel to the flow direction, and the rectifying plate extends to the upstream side of the separation plate. A bent portion in the bent structure is arranged on a line.

  Accordingly, the distance between the opening on the blower side of the active silencer or the opening on the hood side and the back surface of the rectifying plate is not uniform, and the distance can be varied depending on the position, and a standing wave is generated in the internal space of the range hood. This can be prevented. Therefore, a specific frequency node is not generated at the position of the noise detection microphone of the active noise device, noise can be detected accurately, and the noise reduction effect of the active noise reduction device can be improved.

  Moreover, as for the range hood which concerns on embodiment of this invention, the front which is the back surface of the said back surface is provided in parallel with the said suction inlet.

  Accordingly, the distance between the fan-side opening of the active silencer or the hood-side opening and the back surface of the rectifying plate can be made different without damaging the appearance of the range hood, and a standing wave is generated in the internal space of the range hood. This can be prevented and the silencing effect of the active silencing device can be improved.

(Embodiment 1)
First, the installation state of the range hood which concerns on this Embodiment is demonstrated using FIG. In addition, FIG. 1 is a figure which shows the installation state of the range hood which concerns on Embodiment 1 of this invention.

  As shown in FIG. 1, the range hood 1 attached to the kitchen is attached above the cooking device 2. The range hood 1 includes a hood portion 3 arranged so as to cover the upper surface of the cooking device 2 and an exhaust portion 4 formed so as to protrude toward the center upper surface side of the hood portion 3. In addition, the one side surface of the range hood 1 when it sees from the arrow X direction in FIG. 1, ie, the surface of the range hood which a cook faces at the time of cooking, is defined as a range hood front. An operation unit 5 for operating a blower described later of the range hood is disposed on the side surface of the hood unit 3 on the front side of the range hood.

  Then, the structure of the range hood 1 is demonstrated using FIG. FIG. 2 is a side sectional view of the range hood according to Embodiment 1 of the present invention.

  As shown in FIG. 2, the range hood 1 includes a rectangular parallelepiped exhaust portion 4 and a hood portion 3 below the exhaust portion 4 (downward in the drawing and upstream as described later).

  The exhaust part 4 has a vertically long rectangular parallelepiped shape having a discharge port 7 opened on the top surface 6 (upward direction in the drawing and downstream direction described later) and a suction port 8 opened in the lower part. By connecting the duct 9 to the discharge port 7, the range hood 1 can be communicated outdoors. The duct 9 is not included in the range hood 1. Further, the suction port 8 communicates with the downstream opening 10 of the hood portion 3.

  The exhaust unit 4 includes a blower 12 that opens the discharge port 11 at the discharge port 7 and a blower space 14 that opens the inlet 13 of the blower 12, and the suction port 8 and the blower space 14 communicate with each other upstream. An active silencing air passage 15 is provided. That is, the blower 12 is located above the exhaust part 4 and exhausts the air in the air passage 16 connecting the suction port 8 and the discharge port 7.

  The active silencer air passage 15 is surrounded by an inner wall 29. The inner wall 30 that is the inner side of the side plate of the exhaust part 4 is located on the outer side of the inner wall 29 in the active silencing air passage 15, that is, the active silencing air passage 15 is provided with a double wall so that noise to the outside is reduced. It has a structure that suppresses release. The active silencer air passage 15 provided on the upstream side of the blower 12 inside the exhaust unit 4 is detected by a downstream microphone 17 that detects noise propagating in the active silencer air passage 15 and the downstream microphone 17. These are connected to a speaker 18 that emits a sound having a phase opposite to that of noise into the active silencing air passage 15 and an upstream microphone 19 that detects noise attenuated by the sound emitted from the speaker 18 into the active silencing air passage 15. An active silencer 20 is provided that includes an arithmetic controller (not shown) that continuously silences the noise of the blower 12.

  The hood portion 3 includes a top plate 21, a downstream opening 10 provided at the center of the top plate 21, and a side wall 24 surrounding the outer periphery of the top plate 21. Further, in the hood portion 3, the filter 22 is installed near the downstream opening 10 and removes oil dust from the sucked air, and below the downstream opening 10 (the downward direction in the drawing, which will be described later). And a current plate 23 installed in the upstream direction). The filter 22 is provided as necessary and is not an essential configuration.

  The top surface plate 21 constitutes one surface above the hood portion 3 (upward direction in the drawing and in the downstream direction described later), and the downstream side opening portion 10 is an opening having a substantially square cross section. It communicates with the exhaust part 4 provided on the upper surface side. At the edge of the top plate 21, a side wall 24 projects downward (downward in the drawing, upstream direction described later), and the upstream side that opens downward by the side wall 24 and the top plate 21. An opening 25 is formed.

  The rectifying plate 23 is a plate that is disposed between the upstream opening 25 and the downstream opening 10 with an inclination with respect to the suction port 8. Thus, a collection port 28 serving as an air intake port to the hood portion 3 is formed by the inner peripheral edge 26 of the upstream opening 25 and the outer peripheral edge 27 of the rectifying plate 23. The rectifying plate 23 is provided in order to ensure the flow velocity of the airflow at the collection port 28, and is configured to cover the downstream opening 10 provided at the center of the top plate 21 from below. In addition, the surface which opposes the cooking appliance 2 of the baffle plate 23 is defined as a front surface, and the surface which opposes the suction inlet 8 is defined as a back surface. Next, the configuration of the active silencer 20 will be described in detail with reference to FIG. FIG. 3 is a side sectional view of the active silencer 20 (including the surrounding opening and the like). As shown in FIG. 3, the active silencer 20 has an upstream microphone 19, a speaker 18, a downstream microphone 17, and a downstream microphone 17 and an upstream microphone 19 in order from the suction port 8 side on the inner wall 29 of the active silencer air passage 15. An arithmetic controller 31 is provided that generates an audio signal whose phase and amplitude are adjusted from the signal and oscillates from the speaker 18.

  The upstream microphone 19 and the speaker 18 are installed on the inner wall 29 on the front side of the range hood in the active silencing air passage 15.

  The upstream microphone 19 and the speaker 18 are brought closer to the suction port 8 side from the central portion in the height direction of the active silencing air passage 15, and the downstream microphone 17 is also brought closer to the blower 12 side that is a noise source from the central portion. It is installed. As a result, the upstream microphone 19 and the speaker 18 are disposed farther from the blower 12 than the downstream microphone 17.

  The arithmetic controller 31 is connected to the upstream microphone 19, the speaker 18, and the downstream microphone 17, and is disposed in a space between the active silencing air passage 15 and the inner wall 30 of the exhaust unit 4. This space has a rectangular tube shape that goes around the inner wall 30 of the exhaust part 4, and the upstream side plate 32 that contacts the top plate 21, and the inner wall 30 of the exhaust part 4 from the downstream end of the active silencing air passage 15. The downstream plate 33 extending in the direction forms a space independent of the air passage 16. The upstream plate 32 is not always necessary, and the top plate 21 may function as the upstream plate 32. As described above, the calculation controller 31 is provided in a space independent of the air blowing path 16 to isolate it from smoke, oily smoke, steam, or the like.

  In the above configuration, when the range hood 1 is operated, an airflow flowing from the collection port 28 toward the duct 9 is generated by the operation of the blower 12 and includes oil smoke and water vapor rising from below (upstream direction) during cooking. The air will be collected.

  The airflow flowing into the back surface of the current plate 23 from the collection port 28 travels along the space between the current plate 23 and the top plate 21 and is guided to the suction port 8. The air sucked from the suction port 8 passes through the blower passage 16 in the order of the active silencing air passage 15, the blower space 14, the inlet 13, and the blower 12, and then passes through the duct 9 from the discharge port 11 to the outside of the exhaust unit 4. And exhausted. Since the active silencer 20 is provided in the air blowing path 16, the noise radiated from the blower 12 is detected by the downstream microphone 17, and the sound having the opposite phase controlled by the arithmetic controller 31 is emitted from the speaker 18. And the noise of the air blower 12 accompanying ventilation is reduced. Reduced noise is radiated from the collection port 28.

  The above is the basic operation of the range hood 1 of the present embodiment. The configuration and operation of the rectifying plate 23 installed with an inclination, which is a feature of the present embodiment, will be described with reference to FIG. FIG. 4 is a side sectional view showing a configuration around the hood portion 3 of the range hood 1 according to Embodiment 1 of the present invention.

  As shown in FIG. 4, the rectifying plate 23 covers the downstream opening 10 below the upstream opening 10 (upstream direction), and the back surface 40 and the front surface 41 are inclined with respect to the suction port 8. Is arranged. That is, the plate has a larger area than the suction port 8.

  Accordingly, for example, the distance L between the opening on the blower 12 side of the active silencer 20 and the back surface 40 of the rectifying plate 23 moves from the inner wall 29 on the front side of the range hood of the active silencer air passage 15 to the inner wall 29 on the rear side of the range hood. It grows as you go. That is, the opening on the blower 12 side of the active silencing air passage 15 and the back surface 40 of the rectifying plate 23 are not parallel, and the distance can be different depending on the position in the horizontal direction, so that standing waves are generated in the active silencing air passage 15. Very little occurs.

  Therefore, the upstream microphone 19 and the downstream microphone 17 do not generate a node with respect to the sound of a specific frequency, and the noise detection performance can be stabilized in the target frequency band. Since the noise detection performance is stabilized, the effect of active silencing is significantly improved.

  Similarly, since the opening on the hood side of the active silencing air passage 15 and the back surface 40 of the rectifying plate 23 are not parallel, and the distance can be different depending on the position in the horizontal direction, a standing wave is generated in the active silencing air passage 15. Very little occurs.

  Further, the distance between the top surface 6 (not shown in FIG. 4) of the exhaust part 4 and the back surface 40 of the rectifying plate 23 is not parallel, and the distance can be varied depending on the position in the horizontal direction. And the active sound deadening air path 15, that is, the occurrence of a standing wave in the air blowing path 16 is extremely reduced, and the standing wave does not reach the active sound deadening device 20.

  Therefore, the upstream microphone 19 and the downstream microphone 17 do not generate a node with respect to sound of a specific frequency, and the effect of stabilizing noise detection performance in the target frequency band is achieved.

  As a result, the space in the range hood 1 can be made a space in which standing waves are hard to occur, and the effect of active silencing can be improved.

  Next, paying attention to the flow of airflow, as shown in FIG. 4, the inner peripheral edge 26 of the side wall 24 on the front side of the range hood of the hood part 3 and the one side on the front side of the range hood constituting the downstream side opening 10. The downstream opening 10 is arranged so that the distance L1 is larger than the distance L2 between the inner peripheral edge 26 of the side wall 24 on the back side of the hood 3 and one side of the back side constituting the downstream opening 10. Yes. That is, the path of the airflow that flows in from the collection port 28 on the front side of the range hood and reaches the suction port 8 is the path of the airflow that flows in from the collection port 28 on the back side and reaches the suction port 8. Longer than that.

  As a result, the pressure loss is greater in the path of the airflow flowing in from the collection port 28 on the front side of the range hood than in the path of the airflow flowing in from the collection port 28 on the rear side. Accordingly, airflow is more easily sucked from the collection port 28 on the rear side of the range hood than on the front side of the range hood.

As shown in FIG. 4, the distance Lx between the inner peripheral edge 26 on the front side of the hood 3 and the outer peripheral edge 27 on the front side of the range hood of the rectifying plate 23 is the inner peripheral edge on the rear side of the range hood of the hood 3. 26 and the rectifying plate 23 are arranged so as to be smaller than the distance Ly between the outer peripheral edge 27 of the rectifying plate 23 on the back side of the range hood. That is, the width (opening width) of the collection port 28 on the front side is configured to be shorter than the width (opening width) of the collection port 28 on the back side. Thereby, the pressure loss of the collection port 28 on the front side of the range hood is larger than that of the collection port 28 on the rear side of the range hood. Therefore, the airflow is more easily sucked from the collection port 28 on the back side than on the front side.

  As a result, the air containing oily smoke and water vapor rising from below (upstream direction) during cooking is collected more from the collection port 28 on the back side, and the cooker contains oily smoke and water vapor. Exposure to air can be suppressed.

  Next, the silencing effect focusing on the airflow will be described.

  As shown in FIG. 4, the upstream microphone 19 and the speaker 18 are connected to the inner wall 29 of the active silencing air passage 15 whose inner wall 29 is close to the side surface on the front side of the range hood of the hood 3, that is, the range of the active silencing air passage 15. It is provided on the inner wall 29 on the front side of the hood. Further, as described above, air containing oily smoke or water vapor is more likely to be repaired from the collection port 28 on the front side of the range hood than to the air flow collected from the collection port 28 on the rear side of the range hood. Few. Therefore, the airflow in the inner wall 29 on the front side of the range hood of the active silencing air passage 15 is sparser than the airflow on the inner wall 29 on the rear side of the range hood around the suction port 8 of the exhaust unit 4.

  As a result, it is possible to reduce the airflow including the oil smoke that the upstream microphone 19 and the speaker 18 touch. If the microphone or speaker 18 is exposed to air containing oily smoke or moisture over a long period of time, dirt may adhere to the surface, which may reduce the noise detection performance of the microphone, or the speaker may not output a correct signal. However, by adopting the above configuration, it is possible to suppress the dirt from adhering to the upstream microphone 19 and the speaker 18, and the silencing effect can be maintained over a long period of time.

  In addition, since the downstream microphone 17 is installed close to the blower 12 and can secure a distance for the air flow to be sufficiently rectified, the downstream microphone 17 is placed on a predetermined surface (inner wall 29 on the front side of the range hood). 17 may not be arranged.

  As described above, the following effects can be obtained by providing the rectifying plate 23 with an inclination and further disposing the rectifying plate 23 so that the pressure loss of the collecting port 28 on the front side is increased. That is, it is possible to realize a range hood that improves the silencing performance and prevents deterioration of the performance due to exposure of the upstream microphone 19 and the speaker 18 to the airflow generated during cooking, and ensures the silencing performance over a long period of time. is there.

(Embodiment 2)
Subsequently, the range hood according to the second embodiment will be described with reference to FIGS. 5 and 6. 5 is a side cross-sectional view of the range hood 1b according to Embodiment 2 of the present invention, and FIG. 6 is a cross-sectional view of the range hood 1b in plan view (perpendicular to the air blowing direction and will be described later). FIG. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, in the active silencing air passage 15 b in the second embodiment, a dividing wall 50 provided in parallel to the blowing direction is arranged in the active silencing air passage 15. That is, in the active silencing air passage 15, the space from the suction port 8 to the opening on the blower 12 side of the active silencing air passage 15 is subdivided into a plurality of small air passages by the dividing wall 50.

  The subdivided structure will be described in more detail. As shown in FIG. 6, the dividing wall 50 includes a dividing wall 50B parallel to the dividing wall 50A perpendicular to the front face of the range hood, and an active silencing air passage. The cross section (ventilation cross section) perpendicular to the air blowing direction at 15 is a cross shape. The four ends of the cross shape are in contact with the inner wall 29 of the active silencing air passage 15 to form four independent divided active silencing air passages 51. That is, the inner wall constituting each divided active silencing air passage 51 is a substantially rectangular divided active silencing air passage 51 constituted by two divided walls 50 and the inner wall 29 of the two active silencing air passages 15. Note that when the upstream microphone 19, the speaker 18, and the downstream microphone 17 are arranged on the dividing wall 50, or in order to arrange wiring and a base, a space may be provided inside the cross-shaped dividing wall 50.

  As shown in FIG. 5, each divided active silencing air passage 51 includes an upstream microphone 19, a speaker 18, and a downstream microphone 17 in this order from the suction port 8 side.

  Generally, the maximum value F of the silencing target frequency of the active silencer in the duct structure is determined by the sound speed Vs and the duct width Ld, and specifically, is determined from F = 0.5 × Vs / Ld. That is, the smaller the duct width Ld is, the more noise can be silenced.

  Therefore, by setting it as the structure of the division | segmentation active silencing air path 51, it can silence to a high frequency and can improve the silencing effect.

  As shown in FIG. 5, the rectifying plate 23 b is installed below the downstream opening 10 (in the upstream direction) so as to cover the downstream opening 10, and is bent in a substantially U shape in a side sectional view. It is a plate of structure. The bent portion 52 of the bent structure is disposed on an extension line to the upstream side of the dividing wall 50 perpendicular to the front direction of the range hood. As a result, the back surface 40 b and the front surface 41 b of the rectifying plate 23 are arranged with an inclination with respect to the suction port 8.

  Thereby, for example, the distance Lb between the opening on the blower 12 side of the divided active silencing air passage 51 and the back surface 40b of the rectifying plate 23b is divided from the dividing wall 50A side perpendicular to the front of the range hood of the divided active silencing air passage 51. It becomes larger as it moves to the inner wall 29 of the active silencing air passage 51. That is, since the opening on the blower 12 side of the divided active silencing air passage 51 and the back surface 40b of the rectifying plate 23 are not parallel, and the distance can be different depending on the position in the horizontal direction, it is fixed in the divided active silencing air passage 51. Waves are very rarely generated.

  Therefore, the upstream microphone 19 and the downstream microphone 17 do not generate a node with respect to the sound of a specific frequency, and the noise detection performance can be stabilized in the target frequency band. Since the noise detection performance is stabilized, the effect of active silencing is significantly improved.

  Similarly, the opening on the hood side of the divided active silencing air passage 51 and the back surface 40b of the rectifying plate 23 are not parallel, and the distance can be different depending on the position in the horizontal direction. Waves are very rarely generated.

  Moreover, since the distance between the top surface 6 of the exhaust part 4 and the back surface 40b of the rectifying plate 23 is not parallel but can be different depending on the position in the horizontal direction, the air blowing space 14 and the divided active silencing air duct 51 are separated. The occurrence of a standing wave in the combined space is extremely reduced, and the standing wave does not reach the divided active silencing air passage 51.

  Therefore, the upstream microphone 19 and the downstream microphone 17 do not generate a node with respect to sound of a specific frequency, and the effect of stabilizing noise detection performance in the target frequency band is achieved.

As a result, by setting it as the said structure, the space in the range hood 1b can be made into the space where a standing wave is hard to generate | occur | produce, and the effect of active silencing can be improved.
As described above, the active silencing air passage 15 is divided into the active silencing air passage 51 by the dividing wall 50, and the rectifying plate 23 is inclined so as to have a substantially square shape, thereby ensuring a high silencing performance. Can be realized.

  Since the range hood concerning this invention can suppress generation | occurrence | production of the standing wave which becomes a factor of the fall of a silencing effect, it can be applied also to another ventilator and is useful.

DESCRIPTION OF SYMBOLS 1, 1b Range hood 2 Heat cooking equipment 3 Hood part 4 Exhaust part 5 Operation part 6 Top surface 7 Discharge port 8 Suction port 9 Duct 10 Downstream side opening part 11 Discharge port 12 Blower 13 Inlet port 14 Blower space 15, 15b Active silence Airflow path 16 Airflow path 17 Downstream microphone 18 Speaker 19 Upstream microphone 20 Active silencer 21 Top panel 22 Filter 23, 23b Rectifier plate 24 Side wall 25 Upstream opening 26 Inner edge 27 Outer edge 28 Collection port 29 Inner wall 30 Inner wall 31 Arithmetic controller 32 Upstream plate 33 Downstream plate 40, 40b Rear surface 41, 41b Front surface 50, 50A, 50B Dividing wall 51 Dividing active silencing air passage 52 Bending portion

Claims (7)

A range hood comprising a hood portion that collects air on the upstream side in the air flow direction, and an exhaust portion that exhausts air collected in the hood portion,
The exhaust part is
A suction port for sucking air into the upstream side;
A discharge port for discharging air sucked from the suction port;
An air passage communicating the suction port and the discharge port;
A blower that is provided inside the air passage and guides air from the suction port to the discharge port;
An active silencing air passage provided inside the air passage and upstream of the blower;
An active silencer for silencing in the active silencer air path,
The food part is
Is a substantially rectangular shape,
A downstream opening communicating with the suction port;
An upstream opening having a larger area than the downstream opening provided on the upstream side of the downstream opening;
A rectifying plate disposed inclined rear relative to the outlet between the upstream opening the downstream opening,
E Bei a collection port is composed of an outer periphery of the rectifying plate and the inner peripheral edge of the upstream opening the air inlet into the hood portion,
The rectifying plate is provided with a front surface that is the back surface of the back surface inclined with respect to the discharge port,
The collection port is a range hood in which a collection port on a predetermined side surface of the hood portion is smaller than a collection port on the opposite side of the predetermined side surface . Before Symbol downstream side opening,
The distance from the collection port on the predetermined side surface of the hood part is
The range hood according to claim 1 , wherein the range hood is longer than a distance from the collection port at the facing side of the predetermined side surface of the hood portion. In the predetermined side surface,
The range hood according to claim 1 or 2 , wherein an operation unit for operating the blower is disposed. The active silencing air path is
A square tube shape,
The active silencer is
An upstream microphone, a speaker, and a downstream microphone are provided in this order from the upstream side,
The range hood according to any one of claims 1 to 3 , wherein the upstream microphone and the speaker are provided on an inner surface of the active silencing air path that is close to the predetermined side surface of the hood portion. A range hood comprising a hood portion that collects air on the upstream side in the air flow direction, and an exhaust portion that exhausts air collected in the hood portion,
The exhaust part is
A suction port for sucking air into the upstream side;
A discharge port for discharging air sucked from the suction port;
An air passage communicating the suction port and the discharge port;
A blower that is provided inside the air passage and guides air from the suction port to the discharge port;
An active silencing air passage provided inside the air passage and upstream of the blower;
An active silencer for silencing in the active silencer air path,
The food part is
A downstream opening communicating with the suction port;
An upstream opening having a larger area than the downstream opening provided on the upstream side of the downstream opening;
A rectifying plate provided with a back surface inclined with respect to the discharge port between the upstream opening and the downstream opening;
It is constituted by an inner peripheral edge of the upstream opening and an outer peripheral edge of the rectifying plate, and is provided with a collection port serving as an air intake port to the hood part,
The current plate is
It has a substantially U-shaped folding structure in cross-sectional view,
Les Njifudo placing the folded portion in the folded structure on the upstream side extension of the downstream opening. The active silencing air path is
Divided into at least two by a separating plate parallel to the flow direction,
The current plate is
The range hood according to claim 5 , wherein a bent portion in the bent structure is arranged on an extension line to the upstream side of the separation plate. A range hood comprising a hood portion that collects air on the upstream side in the air flow direction, and an exhaust portion that exhausts air collected in the hood portion,
The exhaust part is
A suction port for sucking air into the upstream side;
A discharge port for discharging air sucked from the suction port;
An air passage communicating the suction port and the discharge port;
A blower that is provided inside the air passage and guides air from the suction port to the discharge port;
An active silencing air passage provided inside the air passage and upstream of the blower;
An active silencer for silencing in the active silencer air path,
The food part is
A downstream opening communicating with the suction port;
An upstream opening having a larger area than the downstream opening provided on the upstream side of the downstream opening;
A back surface is inclined between the upstream opening and the downstream opening with respect to the discharge port.
A straightened current plate,
It is constituted by an inner peripheral edge of the upstream opening and an outer peripheral edge of the rectifying plate, and is provided with a collection port serving as an air intake port to the hood part,
The current plate is
Les Njifudo the backside a is front of the rear is provided in parallel to the suction port.

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