CN113203111A - Range hood and noise reduction control method thereof - Google Patents

Range hood and noise reduction control method thereof Download PDF

Info

Publication number
CN113203111A
CN113203111A CN202110475152.7A CN202110475152A CN113203111A CN 113203111 A CN113203111 A CN 113203111A CN 202110475152 A CN202110475152 A CN 202110475152A CN 113203111 A CN113203111 A CN 113203111A
Authority
CN
China
Prior art keywords
noise
sound
range hood
noise reduction
piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110475152.7A
Other languages
Chinese (zh)
Other versions
CN113203111B (en
Inventor
曹元�
梁雪斐
陈瑞
胡巧玲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Fotile Kitchen Ware Co Ltd
Original Assignee
Ningbo Fotile Kitchen Ware Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningbo Fotile Kitchen Ware Co Ltd filed Critical Ningbo Fotile Kitchen Ware Co Ltd
Priority to CN202110475152.7A priority Critical patent/CN113203111B/en
Publication of CN113203111A publication Critical patent/CN113203111A/en
Application granted granted Critical
Publication of CN113203111B publication Critical patent/CN113203111B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement or mounting of control or safety systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • F16L55/0336—Noise absorbers by means of sound-absorbing materials

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ventilation (AREA)
  • Duct Arrangements (AREA)

Abstract

The invention discloses a range hood, which comprises an air inlet component, a power device arranged above a suspended ceiling and a connecting pipeline for communicating the air inlet component with the power device, and is characterized in that: the noise reduction assembly is arranged between the connecting pipeline and the power device and comprises a first box body, the first box body comprises a front side wall located on the front side, the front side wall comprises a bent section located on the upper portion at least, and the bent section is inclined downwards and gradually backwards from the upper end of the front side wall to form a smooth and curved shape. The noise reduction control method of the range hood is also disclosed. Compared with the prior art, the invention has the advantages that: the noise reduction assembly with the smooth and curved structure is arranged on the box body, the oil fume flow passing through the noise reduction assembly can be guided, so that the air flow can be balanced, the eddy current is reduced, the pneumatic noise is reduced, and meanwhile, the downward-propagating noise of the power device can be reflected, so that the downward-propagating noise is reduced.

Description

Range hood and noise reduction control method thereof
Technical Field
The invention relates to an oil fume purification device, in particular to a range hood and a noise reduction control method of the range hood.
Background
The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.
Noise is always a serious problem troubling users, and the noise of the range hood is mainly classified into the following three types:
1) aerodynamic noise, which includes the following two categories:
1.1) rotational noise: when the impeller rotates, the blades hit the surrounding gas medium, causing pressure pulsation of the surrounding gas.
1.2) eddy current noise: airflow eddies or sudden changes in pressure in the flow passage cause air turbulence and thus noise.
2) Mechanical noise: the vibration of the structural components of the volute, the impeller, the motor, the fan and the box body is generated by fixed vibration.
3) Electromagnetic noise: the magnetic field in the motor pulsates to cause the vibration of the electric appliance parts to generate noise.
The main noise source in the range hood is aerodynamic noise generated by a power system (fan system), and when the distance between the noise source and a user is properly increased, the noise can be remarkably reduced. Therefore, at present, a noise reduction method is to place a fan system of the range hood on a ceiling so that a noise source is far away from human ears, and the range hood has certain noise reduction advantages compared with a traditional range hood. A range hood as disclosed in chinese patent application No. 201420736783.5, comprising: the smoke collecting cover is provided with a first smoke inlet and a first smoke outlet; the smoke exhaust box is internally provided with a smoke exhaust component and is provided with a second smoke inlet and a second smoke outlet; the first pipe fitting is used for connecting the first smoke outlet and the second smoke inlet and used for smoke inlet, the smoke exhaust ventilator is smoothly installed in the ceiling, the impeller and the motor in the smoke exhaust box are far away from a user, and when the smoke exhaust ventilator works, the noise perceived by the user is reduced; still like the range hood that chinese patent application No. 201820663244.1 disclosed, include collection petticoat pipe and the host computer passageway that sets gradually from bottom to top to and be located the centrifugal fan at the top of range hood, wherein, the one end of host computer passageway links to each other with collection petticoat pipe, and the other end links to each other with centrifugal fan's fan air intake, and centrifugal fan is located the top of furred ceiling, can reduce the adverse effect that the range hood noise caused to the human body.
In the existing range hood, the air duct below the fan system adopts the straight-through cavity, the distance is long, the space of a cabinet is occupied, and the noise suction force of the stepped cavity is uneven; although the noise source can be far away from the human ear, the technical scheme for preventing the noise from being transmitted downwards and ensuring the air volume does not exist, so that the following problems exist:
1. the noise passes through the wind channel cavity and propagates downwards, does not carry out noise reduction to the noise and handles, and actual noise reduction effect is not ideal, and the furred ceiling range hood of uniform cross section can have certain advantage on velocity of flow is balanced, has nevertheless occupied a large amount of cupboard spaces, and the cost has very big increase.
2. The targeted noise reduction treatment can not be carried out according to the frequency of noise, the rotating speeds of the fans of the range hood are different under different gears, the pneumatic noise frequencies generated by blade cutting airflow are also different, the single noise reduction has a certain effect, and the single noise reduction is poor in broadband noise.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a range hood to ensure the uniformity of the air flow, avoid the downward transmission of noise, and reduce the noise.
The second technical problem to be solved by the invention is to provide a noise reduction control method of the range hood.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a range hood, includes the air inlet subassembly, is used for setting up the power device in the furred ceiling top and with the connecting tube of air inlet subassembly and power device fluid intercommunication, its characterized in that: the noise reduction assembly is arranged between the connecting pipeline and the power device and comprises a first box body, the first box body comprises a front side wall located on the front side, the front side wall comprises a bent section located on the upper portion at least, and the bent section is inclined downwards and gradually backwards from the upper end of the front side wall to form a smooth and curved shape.
Further, in order to absorb the pneumatic noise in the power device and the air duct conveniently, a sound absorption assembly is further arranged in the first box body.
Further, for the guide air current, balanced air current reduces the vortex, inhale the sound subassembly and include that the first sound piece and the second of inhaling inhales the sound piece, the first sound piece that inhales sets up the upper end at the curved segment of preceding lateral wall, the second is inhaled the lower extreme that the sound piece set up the curved segment of lateral wall in the front, the first sound piece and the second of inhaling is inhaled the sound piece and is laminated with preceding lateral wall, and the first sound piece and the second of inhaling is inhaled the surface that the sound piece kept away from preceding lateral wall and also is slick and sly crooked shape.
Further, in order to facilitate absorption of aerodynamic noise in the power device and the air duct, a noise reduction guide plate is further arranged in the first box body, the noise reduction guide plate is arranged on the bent section of the front side wall, and a noise reduction hole is formed in the noise reduction guide plate.
Further, for make the noise cancel in the cavity, reduce the noise of the downward propagation that power device produced, first box is still including the back lateral wall that is located the rear side, be provided with the third on the back lateral wall and inhale the sound piece, the third is inhaled the sound piece and can be absorbed the noise of the power device downward transmission that comes by the guide plate reflection of making an uproar.
Further, for the noise according to different frequencies carries out the pertinence ground absorption, sound piece is inhaled to the third has the region of two at least different noise absorption frequencies, it is connected through the pivot rotation with preceding lateral wall to fall the guide plate of making an uproar, the pivot extends in the left and right directions, be provided with in the first box and be used for the drive to fall the guide plate pivoted actuating mechanism of making an uproar to adjust the angle of falling the guide plate of making an uproar, reflect power device's noise to the region that the sound piece corresponds the noise absorption frequency is inhaled to the third.
Preferably, in order to form the regions with different noise absorption frequencies, the third sound-absorbing member includes at least two wedges, the tips of the wedges face forward, the wedges are arranged up and down, and the structural dimensions of the wedges are not completely the same, so that the third sound-absorbing member has at least two regions with different noise absorption frequencies.
Further, for the negative pressure that power device produced sinks, prevents that the too much influence of negative pressure loss from inhaling oil smoke effect, air inlet subassembly includes the second box and sets up the air intake on the second box, the front side of connecting tube and second box all corresponds with the lower extreme of the preceding lateral wall of first box, is formed by the vertical downwardly extending of the preceding lateral wall of first box.
Preferably, in order to facilitate reduction of the length of the smoke pipe and the number of the smoke pipe elbows and further reduce resistance at the rear end, the power device comprises a third box body and a fan system arranged in the third box body, and the fan system is horizontally arranged under the condition of the same air volume and common back pressure, so that the motor gear of the fan system is small, the rotating speed is low, and the noise is low.
In order to further absorb the noise generated by the fan system, a fourth sound absorbing piece is arranged in the space between the outside of the fan system and the third box body.
Further, for noise that the fan system propagated downwards is repeatedly reflected between noise reduction assembly and the fourth sound-absorbing piece, so as to achieve the effect of noise reduction and noise absorption, and avoid causing air quantity and static pressure loss, the fan system comprises a downward fan air inlet, a through hole is formed in the position, corresponding to the fan air inlet, of the fourth sound-absorbing piece arranged below the fan system, and the shape and the size of the through hole are respectively matched with the fan air inlet.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the noise reduction control method for the range hood is characterized in that the power device of the range hood comprises a fan system, the fan system comprises a volute, an impeller arranged in the volute and a motor used for driving the impeller, and a downward fan air inlet is formed in the volute: the third sound absorbing member has a low frequency noise absorbing region and a high frequency noise absorbing region, and the noise reduction control method includes the steps of:
1) starting the range hood;
2) obtaining the current rotating speed N of a motor of a fan system, obtaining the current main noise frequency f1 of the range hood according to a formula f1 (N/60K), wherein K is the number of blades of an impeller, and adjusting the angle of a noise reduction guide plate according to f 1:
2.1) if f1 is less than the preset value fa of noise frequency, the driving mechanism drives the noise reduction guide plate to rotate to face the low-frequency noise absorption area of the third sound absorption piece;
2.2) if f1 is not less than the preset value fa of the noise frequency, the driving mechanism drives the noise reduction guide plate to rotate towards the high-frequency noise absorption area of the third sound-absorbing member.
Compared with the prior art, the invention has the advantages that: the noise reduction assembly with the smooth bending structure in the box body can guide the passing oil fume flow, balance the air flow, reduce eddy current and pneumatic noise, and reflect the downward noise of the power device, so that the downward noise is reduced; the sound absorption piece is arranged, so that the noise in the air duct can be absorbed, the noise is further reduced, and the sound absorption piece is arranged in a smooth and curved shape, so that the flow guiding effect can be achieved, and the air in the air duct can be uniformly flowed; the noise reduction guide plate is arranged, so that the noise transmitted downwards by the power device can be reflected, and the noise can be absorbed, reflected and absorbed again, so that the noise is reduced; the suction pieces with different noise absorption frequency areas are arranged and matched with the noise reduction guide plate, and the noise reduction guide plate reflects the noise with different frequencies to the corresponding noise absorption areas through rotation, so that the effective absorption of the noise with different frequencies is realized; due to the horizontal arrangement of the fan system, the length of the smoke exhaust pipe is reduced, the number of bends of the smoke exhaust pipe is reduced, the rear end resistance is reduced, and the motor has small gear, low rotating speed and low noise under the same air volume and common back pressure; the connecting pipeline and the air inlet assembly form a thin long air channel, so that negative pressure generated by the fan system sinks, and the oil smoke absorption effect is prevented from being influenced by excessive negative pressure loss.
Drawings
FIG. 1 is a schematic view of a range hood according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a range hood in accordance with an embodiment of the present invention;
FIG. 3 is a cross-sectional view (front-to-back cross-section) of a noise reduction assembly of an embodiment of the present invention;
FIG. 4 is a cross-sectional view (left-right cross-section) of a noise reduction assembly of an embodiment of the present invention;
FIG. 5 is a cross-sectional side view (front-to-back cross-section, hidden noise reduction baffle) of a noise reduction assembly of an embodiment of the present invention;
FIG. 6 is a cross-sectional side view (front-to-back cross-section, high frequency) of a noise reduction assembly of an embodiment of the present invention;
FIG. 7 is a cross-sectional side view (front-to-back cross-section, low frequency) of a noise reduction assembly of an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Referring to fig. 1 and 2, a range hood is a ceiling range hood and comprises an air inlet assembly 1, a connecting pipeline 2, a noise reduction assembly 3 and a power device 4, wherein the air inlet assembly 1, the connecting pipeline 2, the noise reduction assembly 3 and the power device 4 are sequentially connected from bottom to top.
Wherein, connecting tube 2 is the flat cuboid pipeline, and flat here means the thickness in the fore-and-aft direction is far less than the flat form of width, and connecting tube 2 upper and lower both ends opening and be cavity.
The noise reduction assembly 3 comprises a first box 31, a sound absorption assembly and a noise reduction guide plate 35 are arranged in the first box 31, the sound absorption assembly comprises a first sound absorption piece 32, a second sound absorption piece 33 and a third sound absorption piece 34, and the sound absorption pieces are preferably sound absorption cotton. The first casing 31 is a hollow casing with openings at both ends, the first casing 31 includes a front sidewall 311 (facing a user in an installation state) at the front side, the front sidewall 311 includes a bent section 3111 at least at the upper portion, and the bent section 311 is gradually inclined backward from the upper end of the front sidewall 311 to a smoothly curved shape. The first housing 31 further comprises a rear side wall 312 which, in the mounted state, is arranged against a wall. The lower end of the first tank 31 is connected to the upper end of the connection pipe 2 and the connection is sealed, and the first tank 31 and the connection pipe 2 are in fluid communication with each other. The front sidewall 311 may further include a vertical section 3112 located below the bent section 3111, a smooth transition between the bent section and the vertical section 3112, a lower end of the vertical section 3112 being connected with an upper end of the connecting duct 2, and the rear sidewall 312 remaining vertically extended.
Referring to fig. 3 to 5, the first sound absorbing member 32 is disposed at the upper end of the bent section 3111 of the front side wall 311, the second sound absorbing member 33 is disposed at the lower end of the bent section 3111 of the front side wall 311, the third sound absorbing member 34 is disposed at the upper portion of the rear side wall 312, and the noise reduction guide plate 35 is also disposed on the front side wall 311 and between the first sound absorbing member 32 and the second sound absorbing member 33. First sound piece 32 and the second sound piece 33 of inhaling is close to preceding lateral wall 311, sets up respectively in the position that preceding lateral wall 311 passes through with noise reduction assembly 4 and connecting tube 2, and first sound piece 32 and the second sound piece 33 of inhaling is kept away from the same smooth and smooth curved shape that is of the surface of preceding lateral wall 311, and preferred and preceding lateral wall 311's bending radian is unanimous to not only play the effect of inhaling the sound and falling the noise, can also play the effect of water conservancy diversion to the gas that passes through, make the air current in the 3 inner spaces of noise reduction assembly even.
The third sound-absorbing member 34 has at least two regions of different noise-absorbing frequencies, and in the present embodiment, has a low-frequency noise-absorbing region and a high-frequency noise-absorbing region. Specifically, the third attracting member 34 includes at least two wedges 341, the tips of the wedges 341 are directed forward, and the wedges 341 are arranged up and down. The structure dimensions of the wedges 341 are not completely the same, and the cutoff frequency F of the wedges 341 isCutting blockCut-off frequency F of wedge 341, related to its size of sound-absorbing structureCutting blockAbout equal to or slightly less than the wavelength frequency of the sound absorbing structure 1/4, as follows:
Fcutting block＝c/(L*4)。
Wherein c represents the sound velocity (the value is 340m/s in the actual oil smoke environment), and L represents the structural size of the wedge 341, which is the length in the front-back direction in the present embodiment and is expressed by m. As can be seen from the above equation, the larger L, the larger FCutting blockThe smaller. The relationship between the noise reduction of wedge 341 and fan system 42 will be described in more detail below.
In order to ensure the flow guiding effect, the upper end and the lower end of the front side of the third sound-absorbing member 34 are continuously extended to perform flow guiding treatment, the size range is equally divided into N parts to achieve the effect of wide-frequency noise absorption, and the frequency range can be divided into 5-12 parts to absorb corresponding frequency noise. As in the present embodiment with five wedges 351, i.e. corresponding to five frequency ranges, the structural dimensions L from up to the wedge 341 are 106.25mm, 75mm, 65mm, 55mm and 42.5mm, respectively. For different frequency noise, noise of corresponding frequency is absorbed by the difference of the size of the wedge 341. According to the above formula, from top to bottom, wedge 341 absorbs noise from low frequency to high frequency.
The rear end of the noise reduction baffle 35 is rotatably connected to the front side wall 311 by a rotating shaft 351, and the rotating shaft 351 extends in the left-right direction. The noise reduction guide plate 35 is provided with noise reduction holes 352, and the noise reduction holes 352 can be arranged in an array. The first casing 31 is further provided with a driving mechanism 36 for driving the noise reduction baffle 35 to rotate relative to the front sidewall 311, and as shown in this embodiment, the driving mechanism 36 is an electric push rod, or any other mechanism capable of driving the noise reduction baffle 35 to rotate.
The air intake assembly 1 includes a second box 11 and an air inlet 12 provided on the second box 11, in this embodiment, the air inlet 12 is provided at the bottom of the front side of the second box 11, a smoke baffle 13 can be provided above the air inlet 12, and the smoke baffle 13 is formed by extending the front side of the second box 11 forward. The upper end of the first tank 11 is opened and connected to the lower end of the connection pipe 2, and the first tank 11 and the connection pipe 2 are in fluid communication with each other. Alternatively, the air intake assembly 1 may also adopt a common top suction structure and a common side suction structure, instead of the low suction structure of the present embodiment. The first box 11 and the connecting duct 2 are similar, and the front side corresponds to the lower end of the front side wall 311 of the first box 31, that is, the front side is formed by the lower end of the front side wall 311 of the first box 31 extending vertically downwards, so that both are flat thin boxes, and a thin cavity is formed therein, thereby saving the space of an upper cabinet, and in addition, the negative pressure generated by a fan system (to be described in detail below) can sink, and the oil smoke absorption effect can be prevented from being influenced too much by the loss of the negative pressure.
The power unit 4 includes a third casing 41 and a fan system 42 disposed in the third casing 41, a lower end of the third casing 41 being open and connected to an upper end of the first casing 31, the first casing 31 and the third casing 41 being in fluid communication with each other. The fan system 42 can adopt a centrifugal fan arranged horizontally, that is, the fan system 42 has a fan inlet 421 and a fan outlet (not shown), and the fan inlet 421 faces downwards, so that the loss of pressure and air volume is reduced to the greatest extent; the fan air outlet faces the side face, so that the smoke exhaust pipe is not required to be bent when being connected with the air outlet cover 422 at the fan air outlet, an elbow is not arranged in the connection process with the public flue, the resistance of the smoke exhaust pipe is reduced, and the rotating speed and the noise of the fan system 42 are reduced under the same air quantity and the same public back pressure. The fan system 42 includes a volute 423, an impeller 424 disposed in the volute 423, and a motor 425 for driving the impeller 424 to rotate, and the fan inlet 421 is opened in the volute 423. This portion of the power plant 4 is installed above the kitchen ceiling.
In the arrangement method of the fan system 42, the main noise is vertically downward, reflected by the noise reduction guide plate 35 and enters the corresponding frequency absorption area of the fourth sound absorbing member 34, and other noise is consumed and absorbed through multiple reflections of the noise reduction guide plate 35.
A fourth sound absorbing member 43, such as sound absorbing cotton, is disposed in a space between the outside of the fan system 42 and the third casing 41, such as being coated outside the fan system 42 and below the volute 423. The fourth sound absorbing member 43 located below the blower system 42 is in a flat plate shape, a through hole 431 is formed in a position corresponding to the blower inlet 421, and the shape and size of the through hole 431 are respectively matched with the blower inlet 421, so that air volume loss and static pressure loss are avoided. Meanwhile, the noise propagated downward by the fan system 42 is repeatedly reflected between the noise reduction assembly 3 and the fourth sound-absorbing member 43, so that the noise is reduced and absorbed.
The noise frequency of the range hood is related to the rotation speed of the fan system 42, the rotation speed of the fan system 42 is N, the number of the blades of the impeller 424 is K, the most important noise frequency f1 of the range hood is N/60 × K, the unit of each parameter is national standard, and only numerical values are taken in the calculation. In the actual use process of the range hood, the rotation speed of the motor 425 is (n1, n2), and the actual noise frequency is (n1, n2), because the number of the blades of the impeller 424 is 60, and the noise frequency is the same as the rotation speed.
As can be seen from the above, the structural size L of the wedge 341 is equal to c/4n, and the noise frequency of the motor 425 is (n1, n2), so that the corresponding structural size of the wedge 341 is in the range of (c/4n2, c/4n 1). If the rotation speed range of motor 425 is (800, 2000), the size range of wedge 341 is (42.5,106.25).
The first box 31 is used as a transition part, the difference of the upper and lower sizes is large, the first sound absorbing piece 32, the second sound absorbing piece 33 and the noise reduction guide plate 35 play a role in guiding the flow of the oil smoke smoothly, and the first sound absorbing piece 32, the second sound absorbing piece 33 and the third sound absorbing piece 34 can better absorb the noise which is transmitted downwards by the fan system 42 in the structure of the first box 31 with the large upper size and the small lower size. The front side wall 311, the first sound-absorbing piece 32 and the second sound-absorbing piece 33 are preferably curved to form an arc shape, so that the resistance of oil smoke flowing through the cavity is reduced, the rotating speed of the motor 425 is reduced under the same air volume, the noise is reduced, and the air volume is increased under the same noise. According to data obtained by experiments, compared with a frame body without a flow-guiding rectangle, the air volume is 1.5-2 m ^3/min more under the same noise of 60dB, and the noise is 2.5-3 dB less under the same air volume of 13m ^ 3/min).
In addition, noise is propagated downward by the fan system 42, a part of the noise is absorbed by the noise reduction holes 352 of the noise reduction baffle 35, the rest of the noise reduction sound enters the respective sound-absorbing members by reflection to absorb most of the noise, and the rest of the noise is absorbed by the third sound-absorbing member 34 by reflection. The noise of different frequencies is reflected to the corresponding area of the third sound-absorbing member 34 by the noise reduction baffle 35 for more effective noise absorption. The noise reduction baffle 35 adjusts the area where noise is reflected to the third sound-absorbing member 34 by the driving of the driving mechanism 36. Thus, the noise is continuously consumed inside the first casing 31, and the downward transmission of the noise is minimized.
The noise reduction control method of the range hood comprises the following steps:
1) starting the range hood;
2) obtaining the current rotating speed N of the motor 425 of the fan system 42, where the obtaining mode may adopt the prior art, for example, the rotating speed of the motor may be obtained according to a gear, the gear corresponds to the air volume Q corresponding to the rotating speed N of the motor (a performance curve of each range hood may obtain a Q-N curve, an air performance test may obtain a P-Q curve, and recording the rotating speed of the motor 425 corresponding to each point Q may obtain a Q-N curve), a built-in program of the range hood may read the current rotating speed N of the motor 425, and a formula f1 ═ N/60 ═ K, because for the determined fan system 42, the number K of blades of the impeller 424 is a determined value, the current main noise frequency f1 of the range hood may be obtained, and the angle of the noise reduction guide plate 35 may be adjusted according to the current main noise frequency f 1:
2.1) if f1 is smaller than the preset noise frequency fa (which can be obtained through multiple experiments and can also be an empirical value), it indicates that the rotation speed of the fan system 42 is low and the current main noise is low-frequency noise, and referring to fig. 7, the output end of the driving mechanism 36 contracts, and the noise reduction guide plate 35 rotates towards the front side wall 311, so that the noise transmitted downwards by the fan system 42 is reflected towards the low-frequency noise absorption area (the upper part of the third sound absorption piece 34) of the third sound absorption piece 34;
2.2) if f1 is not less than the preset noise frequency fa, indicating that the fan system 42 has a large rotation speed and the current major noise is high-frequency noise, referring to fig. 6, the output end of the driving mechanism 36 extends out to rotate the noise reduction guide plate 35 away from the front side wall 311, so that the noise transmitted downward by the fan system 42 is reflected toward the high-frequency noise absorption region (lower part of the third sound absorbing member 34) of the third sound absorbing member 34.
In the above step 2), the center line of the impeller 424 of the fan system 42 is directed downward to represent the noise source, the noise source is reflected by the noise reduction baffle 35 (the incident angle is the exit angle), and the angle of the noise reduction baffle 35 is adjusted to reflect the noise to the corresponding area of the third sound absorbing member 34 in accordance with the adjustment of the incident angle of the main noise source.
The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion, respectively), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion and/or be transported to the second portion, and may be a direct communication between the first portion and the second portion, or an indirect communication between the first portion and the second portion via at least one third element, such as a fluid channel, e.g., a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber that allows a fluid to flow through, or a combination thereof.

Claims (12)

1. The utility model provides a range hood, includes air inlet subassembly (1), is used for setting up power device (4) above the furred ceiling and with air inlet subassembly (1) and power device (4) fluid intercommunication connecting tube (2), its characterized in that: be provided with between connecting tube (2) and power device (4) and fall noise assembly (3), fall noise assembly (3) including first box (31), first box (31) are including being located preceding lateral wall (311) of front side, preceding lateral wall (311) are including being located the curved segment (3111) on upper portion at least, curved segment (3111) is inclined downwards gradually backward by the upper end of preceding lateral wall (311) and is become the shape of rounding off.
2. The range hood of claim 1, wherein: and a sound absorption assembly is also arranged in the first box body (31).
3. The range hood of claim 2, wherein: inhale the sound subassembly and include that first sound piece (32) and the second of inhaling inhales sound piece (33), first sound piece (32) of inhaling sets up the upper end in curved section (3111) of preceding lateral wall (311), the second is inhaled the lower extreme that sound piece (33) set up curved section (3111) of lateral wall (311) in the front, first sound piece (32) and the second of inhaling is inhaled sound piece (33) and is laminated with preceding lateral wall (311), and first sound piece (32) and the second of inhaling is inhaled the surface that sound piece (33) kept away from preceding lateral wall (311) and also is slick and sly crooked shape.
4. The range hood of claim 1, wherein: still be provided with in first box (31) and fall the guide plate (35) of making an uproar, fall the guide plate (35) of making an uproar and set up on the bending section (3111) of preceding lateral wall (311), fall and seted up on the guide plate (35) of making an uproar and fall hole (352).
5. The range hood of claim 4, wherein: the first box body (31) further comprises a rear side wall (312) located on the rear side, a third sound absorbing piece (34) is arranged on the rear side wall (312), and the third sound absorbing piece (34) can absorb noise which is reflected by the noise reduction guide plate (35) and transmitted downwards by the power device (4).
6. The range hood of claim 5, wherein: the third sound absorbing part (34) is provided with at least two regions with different noise absorbing frequencies, the noise reduction guide plate (35) is rotatably connected with the front side wall (311) through a rotating shaft (351), the rotating shaft (351) extends in the left-right direction, and a driving mechanism (36) for driving the noise reduction guide plate (35) to rotate is arranged in the first box body (31), so that the angle of the noise reduction guide plate (35) is adjusted, and the noise of the power device (4) is reflected to the region of the third sound absorbing part (34) corresponding to the noise absorbing frequencies.
7. The range hood of claim 6, wherein: the third sound-absorbing member (34) comprises at least two wedges (341), the tips of the wedges (341) face forwards, the wedges (341) are arranged up and down, and the structural sizes of the wedges (341) are not completely the same, so that the third sound-absorbing member (34) has at least two areas with different noise absorption frequencies.
8. The range hood according to any one of claims 1 to 7, wherein: the air inlet assembly (1) comprises a second box body (11) and an air inlet (12) formed in the second box body (11), the front sides of the connecting pipeline (2) and the second box body (11) correspond to the lower end of the front side wall (311) of the first box body (31), and the front side wall (311) of the first box body (31) vertically extends downwards to form the air inlet assembly.
9. The range hood according to any one of claims 1 to 7, wherein: the power device (4) comprises a third box body (41) and a fan system (42) arranged in the third box body (41), and the fan system (42) is arranged horizontally.
10. The range hood of claim 9, wherein: a fourth sound absorbing member (43) is provided in a space between the outside of the fan system (42) and the third case (41).
11. The range hood of claim 10, wherein: the fan system (42) comprises a downward fan air inlet (421), a through hole (431) is formed in the position, corresponding to the fan air inlet (421), of a fourth sound absorbing piece (43) arranged below the fan system (42), and the shape and the size of the through hole (431) are matched with the fan air inlet (421) respectively.
12. The noise reduction control method of the range hood according to claim 6 or 7, wherein the power device (4) of the range hood includes a fan system (42), the fan system (42) includes a volute (423), an impeller (424) disposed in the volute (423), and a motor (425) for driving the impeller (424), the volute (423) is provided with a downward fan inlet (421), and the method is characterized in that: the third sound-absorbing member (34) has a low-frequency noise absorbing region and a high-frequency noise absorbing region, and the noise reduction control method includes the steps of:
1) starting the range hood;
2) acquiring the current rotating speed N of a motor (425) of a fan system (42), acquiring the current main noise frequency f1 of the range hood according to a formula f1 (N/60) K, wherein K is the number of blades of an impeller (424), and adjusting the angle of a noise reduction guide plate (35) according to f 1:
2.1) if f1 is less than the preset value fa of noise frequency, the driving mechanism (36) drives the noise reduction guide plate (35) to rotate to face the low-frequency noise absorption area of the third sound absorption piece (34);
2.2) if f1 is not less than the preset value fa of the noise frequency, the driving mechanism (36) drives the noise reduction guide plate (35) to rotate to face the high-frequency noise absorption area of the third sound absorption piece (34).
CN202110475152.7A 2021-04-29 2021-04-29 Range hood and noise reduction control method thereof Active CN113203111B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110475152.7A CN113203111B (en) 2021-04-29 2021-04-29 Range hood and noise reduction control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110475152.7A CN113203111B (en) 2021-04-29 2021-04-29 Range hood and noise reduction control method thereof

Publications (2)

Publication Number Publication Date
CN113203111A true CN113203111A (en) 2021-08-03
CN113203111B CN113203111B (en) 2022-10-21

Family

ID=77027842

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110475152.7A Active CN113203111B (en) 2021-04-29 2021-04-29 Range hood and noise reduction control method thereof

Country Status (1)

Country Link
CN (1) CN113203111B (en)

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471537A (en) * 1992-11-03 1995-11-28 Aktiebolaget Electrolux Kitchen ventilator
CN201221800Y (en) * 2008-05-27 2009-04-15 宁波方太厨具有限公司 Air-out cover of cooking fume exhauster with active noise reduction function
CN102072514A (en) * 2011-01-20 2011-05-25 宁波方太厨具有限公司 Noise reducing method for range hood and low-noise range hood
CN102748787A (en) * 2012-06-15 2012-10-24 海尔集团公司 Low noise range hood equipped with diversion noise reducing acoustical panel
CN104180412A (en) * 2014-08-09 2014-12-03 华帝股份有限公司 Smoke absorbing and noise reducing device of range hood
CN104534532A (en) * 2014-12-18 2015-04-22 宁波方太厨具有限公司 Noise reduction device of range hood
CN107990390A (en) * 2018-01-22 2018-05-04 广东美的厨房电器制造有限公司 A kind of range hood
CN209026909U (en) * 2018-09-22 2019-06-25 宁波方太厨具有限公司 A kind of range hood with denoising structure
CN209445436U (en) * 2018-09-29 2019-09-27 九阳股份有限公司 A kind of mute range hood
CN110905858A (en) * 2019-11-07 2020-03-24 宁波方太厨具有限公司 Fume exhaust fan
CN111189085A (en) * 2020-01-03 2020-05-22 宁波方太厨具有限公司 Range hood and control method thereof
CN112283767A (en) * 2020-09-15 2021-01-29 华帝股份有限公司 Range hood with silencing device
CN112539431A (en) * 2020-03-27 2021-03-23 宁波方太厨具有限公司 Fume exhaust fan

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471537A (en) * 1992-11-03 1995-11-28 Aktiebolaget Electrolux Kitchen ventilator
CN201221800Y (en) * 2008-05-27 2009-04-15 宁波方太厨具有限公司 Air-out cover of cooking fume exhauster with active noise reduction function
CN102072514A (en) * 2011-01-20 2011-05-25 宁波方太厨具有限公司 Noise reducing method for range hood and low-noise range hood
CN102748787A (en) * 2012-06-15 2012-10-24 海尔集团公司 Low noise range hood equipped with diversion noise reducing acoustical panel
CN104180412A (en) * 2014-08-09 2014-12-03 华帝股份有限公司 Smoke absorbing and noise reducing device of range hood
CN104534532A (en) * 2014-12-18 2015-04-22 宁波方太厨具有限公司 Noise reduction device of range hood
CN107990390A (en) * 2018-01-22 2018-05-04 广东美的厨房电器制造有限公司 A kind of range hood
CN209026909U (en) * 2018-09-22 2019-06-25 宁波方太厨具有限公司 A kind of range hood with denoising structure
CN209445436U (en) * 2018-09-29 2019-09-27 九阳股份有限公司 A kind of mute range hood
CN110905858A (en) * 2019-11-07 2020-03-24 宁波方太厨具有限公司 Fume exhaust fan
CN111189085A (en) * 2020-01-03 2020-05-22 宁波方太厨具有限公司 Range hood and control method thereof
CN112539431A (en) * 2020-03-27 2021-03-23 宁波方太厨具有限公司 Fume exhaust fan
CN112283767A (en) * 2020-09-15 2021-01-29 华帝股份有限公司 Range hood with silencing device

Also Published As

Publication number Publication date
CN113203111B (en) 2022-10-21

Similar Documents

Publication Publication Date Title
KR100405982B1 (en) Flow path structure for cassette typed air conditioner
CN207555703U (en) Noise reducing casing component and range hood
US20120018246A1 (en) Muffler Unit for Fume Extractor Hood
CN212618543U (en) Fume exhaust fan
WO2012017575A1 (en) Air conditioner
CN206755301U (en) A kind of noise reduction range hood
WO2019148991A1 (en) Smoke extraction device
CN111878867B (en) Air guide box structure and internal circulation range hood applying same
WO2021036485A1 (en) Range hood
CN113203111B (en) Range hood and noise reduction control method thereof
CN111336558B (en) Air outlet hood, range hood applying air outlet hood and control method of range hood
CN211423009U (en) Frequency-adjustable noise-reducing centrifugal ventilator and volute thereof
CN109780596B (en) Noise reduction flow guiding device and range hood using same
CN107990390B (en) Fume exhaust fan
CN205306900U (en) Silencer for dust collector
CN209026909U (en) A kind of range hood with denoising structure
CN110925240A (en) Frequency-adjustable noise-reducing centrifugal ventilator and volute thereof
CN112484114B (en) Noise reduction device, range hood applying noise reduction device and control method of range hood
CN108869407A (en) A kind of air exhaust muffler device and household appliance
CN108506231B (en) Fan device
WO2019148994A1 (en) Range hood
CN217274334U (en) Fume exhaust fan
CN214275881U (en) Fume exhaust fan
CN218495047U (en) Fume exhaust fan
WO2019119818A1 (en) Air duct structure, fan and range hood

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant