CN110726163A - Range hood and noise reduction device and method thereof - Google Patents
Range hood and noise reduction device and method thereof Download PDFInfo
- Publication number
- CN110726163A CN110726163A CN201911010077.6A CN201911010077A CN110726163A CN 110726163 A CN110726163 A CN 110726163A CN 201911010077 A CN201911010077 A CN 201911010077A CN 110726163 A CN110726163 A CN 110726163A
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- rotating speed
- range hood
- abnormal sound
- sound section
- noise reduction
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- 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
Abstract
The invention discloses a range hood and a noise reduction device and method thereof. The method comprises the following steps: acquiring actual rotating speeds of different rotating speed gears of the range hood; judging whether the obtained actual rotating speed of each gear falls into a different sound section; and when the actual rotating speed of each gear falls into the abnormal sound section, adjusting the rotating speed to avoid the rotating speed belonging to the abnormal sound section. The device includes: the rotating speed acquisition unit is used for acquiring actual rotating speeds of different rotating speed gears of the range hood; the abnormal sound section judging unit is used for judging whether the acquired actual rotating speed of each gear falls into the abnormal sound section; and the rotating speed adjusting unit is used for adjusting the rotating speed to avoid the rotating speed belonging to the abnormal sound section when the actual rotating speed of each gear falls into the abnormal sound section. The range hood comprises the noise reduction device. The range hood and the noise reduction device and method thereof avoid the rotating speed section with unsatisfactory tone quality by avoiding the rotating speed, and reduce the noise of the range hood.
Description
Technical Field
The invention relates to a technology for reducing wind noise, in particular to a range hood and a noise reduction device and method thereof.
Background
The kitchen inevitably produces a large amount of oil smoke, and for guaranteeing the cleanness and the health in kitchen, range hood has become the essential life electrical apparatus in kitchen, to present range hood, the noise problem has become user's main pain point, cooks under this kind of noise for a long time, can bring adverse reaction such as dizziness, dysphoria, palpitation for the user, seriously influences user experience. Therefore, the range hood is subjected to noise reduction treatment. The noise of the range hood mainly comprises fluid noise generated in a fan and an air duct; structural noise caused by vibration of motors, blades and the like; and electromagnetic noise generated by vibration of the motor stator and rotor. Therefore, the range hood with good sound quality can become the product which consumers are oriented to.
Disclosure of Invention
The invention aims to solve the technical problem of providing a range hood, a noise reduction device and a noise reduction method thereof, and adopts a solution for avoiding rotating speed aiming at the problem of poor tone quality of part of rotating speed sections of the range hood.
In order to solve the technical problems, the invention adopts the following technical scheme:
in one aspect, the present disclosure provides a method for noise reduction. The noise reduction method is applied to the range hood, and comprises the following steps: acquiring actual rotating speeds of different rotating speed gears of the range hood; judging whether the obtained actual rotating speed of each gear falls into a different sound section; and when the actual rotating speed of each gear falls into the abnormal sound section, adjusting the rotating speed to avoid the rotating speed belonging to the abnormal sound section.
Optionally, for the noise reduction method, acquiring actual rotation speeds of different rotation speed gears of the range hood includes: acquiring PQ curves of different rotating speed gears of the range hood, acquiring an operation curve in the starting process of the range hood, and acquiring the actual rotating speed of each gear according to the intersection point of the PQ curves and the operation curve of the different rotating speed gears.
Alternatively, with the noise reduction method, adjusting the rotation speed to avoid the rotation speed belonging to the abnormal sound section when the actual rotation speed of each gear falls within the abnormal sound section includes: and when the actual rotating speed of each gear falls into the abnormal sound section, adjusting the rotating speed by adjusting the duty ratio of the pulse width modulation signal so as to avoid the rotating speed belonging to the abnormal sound section.
Optionally, with the noise reduction method, the adjustment amount of each time the duty cycle of the pwm signal is adjusted is determined by the length of the unvoiced segment and/or is determined according to the principle of adjusting the duty cycle nearby.
Optionally, the noise reduction method further comprises: and after the power supply of the range hood is turned off, the range hood is powered on or is turned on every preset time period, and the adjustment quantity of the duty ratio of the pulse width modulation signal is reset after the adjustment quantity of the duty ratio of the pulse width modulation signal is cleared.
In another aspect, the present disclosure provides a noise reduction apparatus. The noise reduction device is applied to a range hood, and the noise reduction device comprises: the rotating speed acquisition unit is used for acquiring actual rotating speeds of different rotating speed gears of the range hood; the abnormal sound section judging unit is used for judging whether the acquired actual rotating speed of each gear falls into the abnormal sound section; and the rotating speed adjusting unit is used for adjusting the rotating speed to avoid the rotating speed belonging to the abnormal sound section when the actual rotating speed of each gear falls into the abnormal sound section.
Optionally, for the noise reduction device, the rotation speed obtaining unit is further configured to obtain PQ curves of the range hood at different rotation speed gears, obtain an operation curve during the starting process of the range hood, and obtain the actual rotation speed of each gear according to an intersection point of the PQ curves of the different rotation speed gears and the operation curve.
Optionally, for the noise reduction apparatus, the rotation speed adjusting unit is further configured to adjust the rotation speed by adjusting a duty ratio of the pwm signal when the actual rotation speed of each gear falls within the abnormal sound section, so as to avoid the rotation speed belonging to the abnormal sound section.
Optionally, for the noise reduction apparatus, the adjustment amount for adjusting the duty ratio of the pwm signal each time is determined by the length of the abnormal sound segment and/or determined according to the principle of adjusting the duty ratio nearby.
In another aspect, the present invention provides a range hood. The range hood comprises the noise reduction device.
Compared with the prior art, the technical scheme of the invention has the following main advantages:
the range hood and the noise reduction device and method thereof of the embodiment of the invention obtain the PQ curve of the range hood, when the range hood is installed at home and is started, the rotating speed of each gear can be identified, and if the rotating speed falls into a different sound section, the rotating speed of the different sound section is avoided, so that the rotating speed is avoided.
The range hood and the noise reduction device and method thereof in the embodiment of the invention generate resonance because the shell frequency of the range hood is the same as the motor frequency or the frequency multiplication of the motor, or abnormal noise generated by the range hood in certain rotating speed sections because errors exist in the assembly or production process of the range hood, avoid the rotating speed sections with unsatisfactory tone quality by avoiding the rotating speed, and reduce the noise of the range hood.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a noise reduction method according to an embodiment of the present invention;
FIG. 2 is a PQ curve and operating graph of an exemplary range hood;
fig. 3 is a schematic structural diagram of a noise reduction device according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Because the shell frequency of the range hood is the same as the motor frequency or the frequency multiplication of the motor, resonance is generated, or because errors exist in the assembly or production process of the range hood, abnormal noise is generated in certain rotating speed sections of the range hood.
The PQ curve is a curve which relates the static pressure and the air quantity of two most important physical variables in the range hood, the abscissa is the air quantity, and the ordinate is the static pressure.
Fig. 1 is a flowchart of a noise reduction method according to an embodiment of the present invention. The noise reduction method of the embodiment is applied to the range hood.
As shown in fig. 1, in step S110, actual rotation speeds of the range hood at different rotation speed gears are obtained. Fig. 2 is a PQ curve and an operation graph of an exemplary range hood. As shown in fig. 2, the specific process of step S110 may include: acquiring PQ curves of different rotating speed gears of the range hood, acquiring an operation curve in the starting process of the range hood, and acquiring the actual rotating speed of each gear according to the intersection point of the PQ curves and the operation curve of the different rotating speed gears. In order to avoid influencing the identification and judgment of the rotating speed, the smoke tube of the range hood is preferably not shaken randomly after the range hood is opened. The PQ curve graph can be obtained by measuring through an air volume experiment table, the air outlet of the range hood faces the air volume experiment table, and all points on the curve are obtained by changing the area of the air outlet of the range hood. Obtaining the actual rotational speed of each gear according to the intersection point of the PQ curve and the operation curve of the gear with different rotational speeds may include: and calculating to obtain the actual rotating speed of each gear according to the intersection point of the PQ curve and the running curve of different rotating speed gears.
In step S120, it is determined whether the acquired actual rotational speed of each gear falls within a distinctive segment. If the actual rotation speed of each gear falls within the abnormal sound section, the flow proceeds to step S130. If the actual rotation speed of each gear does not fall within the abnormal sound section, the flow proceeds to step S140. Whether the rotation speed falls into an abnormal sound section or not can be determined by a frequency spectrograph and/or human ear detection.
In step S130, the rotation speed is adjusted to avoid the rotation speed belonging to the abnormal sound section. Step S130 may include: when the actual rotating speed of each gear falls into the abnormal sound section, the rotating speed is adjusted by adjusting the duty ratio of a Pulse Width Modulation (PWM) signal so as to avoid the rotating speed belonging to the abnormal sound section. The rotating speed is adjusted by a method of avoiding the rotating speed, namely increasing or reducing the duty ratio of the PWM signal, so that the rotating speed section with poor sound quality, which is called a strange sound section in the following, is avoided.
In step S140, the range hood normally operates.
The adjustment amount for each adjustment of the duty cycle of the PWM signal may be determined by the length of the mute segment. For example, when the rotation speed range corresponding to the duty ratio of 700-800 falls into the abnormal sound section and the duty ratio corresponding to the actual rotation speed of the current range hood is 720, under the condition of adopting the adjustment mode of adding the current duty ratio and the duty ratio adjustment amount, the adjustment amount for adjusting the duty ratio each time is preferably greater than 30, so that the abnormal sound section can be skipped within 3 times of adjustment. The adjustment amount for each adjustment of the duty ratio of the PWM signal may be determined according to the principle of adjusting the duty ratio of the PWM signal in the near vicinity. For example, the rotating speed range corresponding to the duty ratio of 700-800 falls into a different sound section, and when the duty ratio corresponding to the actual rotating speed of the current range hood is 720, the distance 720 is closer to 700 than 800, so that the current duty ratio minus the duty ratio adjustment amount is adopted for adjustment according to the nearby adjustment principle. Of course, these two determinants can be considered together.
Because the actually measured rotating speed of the range hood during operation is influenced by factors such as the position of the installed smoke pipe and/or the pressure of the common flue, and the like, if the smoke pipe passes passively, the rotating speed corresponding to the duty ratio of the PWM signal of the range hood changes. As an optional implementation mode, the range hood is powered on and started after the power supply is turned off every time, and the duty ratio adjustment quantity of the PWM signal is reset after the duty ratio adjustment quantity of the PWM signal is cleared. As another alternative, the adjustment amount of the duty ratio of the PWM signal is reset after the adjustment amount of the duty ratio of the PWM signal is cleared every preset time period, for example, one month.
Fig. 3 is a schematic structural diagram of a noise reduction device according to an embodiment of the present invention. The noise reduction device provided by the embodiment is applied to the range hood. As shown in fig. 3, the noise reduction apparatus 300 of this embodiment includes a rotational speed acquisition unit 310, an abnormal sound stage determination unit 320, and a rotational speed adjustment unit 330.
The rotation speed obtaining unit 310 is configured to obtain actual rotation speeds of different rotation speed gears of the range hood. The rotation speed obtaining unit 310 may be further configured to obtain PQ curves of different rotation speed gears of the range hood, obtain an operation curve during the starting process of the range hood, and obtain actual rotation speeds of the gears according to intersection points of the PQ curves and the operation curve of the different rotation speed gears. The method comprises the steps of obtaining PQ curves of different gears of a cigarette machine, and identifying the actual rotating speed of each gear according to the intersection point of the PQ curves and the running curve in the starting process after the cigarette machine is installed at home.
The abnormal sound stage determination unit 320 is configured to determine whether the acquired actual rotation speed of each gear falls into the abnormal sound stage.
The rotation speed adjusting unit 330 is configured to adjust the rotation speed to avoid the rotation speed belonging to the abnormal sound section when the actual rotation speed of each gear falls into the abnormal sound section. The rotating speed adjusting unit can be further used for adjusting the rotating speed by adjusting the duty ratio of the PWM signal when the actual rotating speed of each gear falls into the abnormal sound section so as to avoid the rotating speed belonging to the abnormal sound section, and thus the rotating speed avoiding effect is achieved.
The adjustment amount for each adjustment of the duty cycle may be determined by the length of the distinctive segment. The adjustment amount for each adjustment of the duty ratio of the PWM signal may be determined according to the principle of adjusting the duty ratio of the PWM signal in the near vicinity. Of course, these two determinants can be considered together.
The embodiment further provides a range hood, which comprises the noise reduction device 300.
The range hood and the noise reduction device and method thereof of the embodiment of the invention obtain the PQ curve of the range hood, when the range hood is installed in a house and is started, the rotating speed of each gear can be identified, and if the rotating speed falls into a different sound section, the rotating speed of the different sound section is avoided, so that the rotating speed is avoided.
The range hood and the noise reduction device and method thereof in the embodiment of the invention generate resonance because the shell frequency of the range hood is the same as the motor frequency or the frequency multiplication of the motor, or abnormal noise generated by the range hood in certain rotating speed sections because errors exist in the assembly or production process of the range hood, avoid the rotating speed sections with unsatisfactory tone quality by avoiding the rotating speed, and reduce the noise of the range hood.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the claims, and all equivalent structures or equivalent processes that are transformed by the content of the specification and the drawings, or directly or indirectly applied to other related technical fields are included in the scope of the claims.
Claims (10)
1. A noise reduction method is applied to a range hood and is characterized by comprising the following steps:
acquiring actual rotating speeds of different rotating speed gears of the range hood;
judging whether the obtained actual rotating speed of each gear falls into a different sound section;
and when the actual rotating speed of each gear falls into the abnormal sound section, adjusting the rotating speed to avoid the rotating speed belonging to the abnormal sound section.
2. The noise reduction method according to claim 1, wherein the obtaining of the actual rotation speeds of the range hood in different rotation speed gears comprises: acquiring PQ curves of different rotating speed gears of the range hood, acquiring an operation curve in the starting process of the range hood, and acquiring the actual rotating speed of each gear according to the intersection point of the PQ curves and the operation curve of the different rotating speed gears.
3. The noise reduction method according to claim 1, wherein adjusting the rotation speed to avoid the rotation speed belonging to the abnormal sound step when the actual rotation speed of each gear falls within the abnormal sound step comprises: and when the actual rotating speed of each gear falls into the abnormal sound section, adjusting the rotating speed by adjusting the duty ratio of the pulse width modulation signal so as to avoid the rotating speed belonging to the abnormal sound section.
4. A noise reduction method according to claim 3, characterized in that the adjustment amount for each adjustment of the duty cycle of the pulse width modulated signal is determined by the length of the unvoiced segment and/or on the basis of a principle of a nearby adjustment of the duty cycle.
5. The noise reduction method according to claim 3 or 4, further comprising: and after the power supply of the range hood is turned off, the range hood is powered on or is turned on every preset time period, and the adjustment quantity of the duty ratio of the pulse width modulation signal is reset after the adjustment quantity of the duty ratio of the pulse width modulation signal is cleared.
6. The utility model provides a noise reduction device, is applied to range hood, its characterized in that, noise reduction device includes:
the rotating speed acquisition unit is used for acquiring actual rotating speeds of different rotating speed gears of the range hood;
the abnormal sound section judging unit is used for judging whether the acquired actual rotating speed of each gear falls into the abnormal sound section;
and the rotating speed adjusting unit is used for adjusting the rotating speed to avoid the rotating speed belonging to the abnormal sound section when the actual rotating speed of each gear falls into the abnormal sound section.
7. The noise reducer according to claim 6, wherein the rotation speed obtaining unit is further configured to obtain PQ curves of different rotation speed gears of the range hood, obtain an operation curve during the start-up process of the range hood, and obtain the actual rotation speed of each gear according to an intersection point of the PQ curves and the operation curve of the different rotation speed gears.
8. The noise reduction apparatus according to claim 6, wherein the rotation speed adjusting unit is further configured to adjust the rotation speed by adjusting a duty ratio of the pulse width modulation signal to avoid the rotation speed belonging to the abnormal sound section when the actual rotation speed of each gear falls within the abnormal sound section.
9. The noise reduction apparatus according to claim 8, wherein the adjustment amount for each adjustment of the duty cycle of the pwm signal is determined by the length of the unvoiced segment and/or is determined on the basis of a principle of adjusting the duty cycle nearby.
10. A range hood comprising a noise reducing device as claimed in any one of claims 6 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911010077.6A CN110726163A (en) | 2019-10-23 | 2019-10-23 | Range hood and noise reduction device and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911010077.6A CN110726163A (en) | 2019-10-23 | 2019-10-23 | Range hood and noise reduction device and method thereof |
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| CN110726163A true CN110726163A (en) | 2020-01-24 |
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| CN201911010077.6A Pending CN110726163A (en) | 2019-10-23 | 2019-10-23 | Range hood and noise reduction device and method thereof |
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| CN105674357A (en) * | 2014-11-19 | 2016-06-15 | 博西华电器（江苏）有限公司 | Range hood and control method and device for range hood |
| CN108211075A (en) * | 2017-12-15 | 2018-06-29 | 湖南明康中锦医疗科技发展有限公司 | The method for stabilizing voltage of lung ventilator wind turbine |
| CN108662635A (en) * | 2017-03-28 | 2018-10-16 | 博西华电器（江苏）有限公司 | Smoke exhaust ventilator and its gear setting method |
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2019
- 2019-10-23 CN CN201911010077.6A patent/CN110726163A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1876932A (en) * | 2005-06-10 | 2006-12-13 | 乐金电子(天津)电器有限公司 | Rotation speed control method and control apparatus for washing machine |
| CN103149990A (en) * | 2011-11-21 | 2013-06-12 | 富士通株式会社 | Blower control device and blower control method |
| CN103683901A (en) * | 2012-09-21 | 2014-03-26 | 现代自动车株式会社 | Inverter controlling system and method for reducing noise in eco-friendly vehicle |
| CN203099948U (en) * | 2013-01-24 | 2013-07-31 | 海尔集团公司 | Smoke exhaust |
| CN104279690A (en) * | 2013-07-11 | 2015-01-14 | 海尔集团公司 | Static pressure air-speed control method |
| CN105674357A (en) * | 2014-11-19 | 2016-06-15 | 博西华电器（江苏）有限公司 | Range hood and control method and device for range hood |
| CN108662635A (en) * | 2017-03-28 | 2018-10-16 | 博西华电器（江苏）有限公司 | Smoke exhaust ventilator and its gear setting method |
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Application publication date: 20200124 |