CN112648665B - Starting control method of range hood and range hood applying same - Google Patents
Starting control method of range hood and range hood applying same Download PDFInfo
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- CN112648665B CN112648665B CN202110012603.3A CN202110012603A CN112648665B CN 112648665 B CN112648665 B CN 112648665B CN 202110012603 A CN202110012603 A CN 202110012603A CN 112648665 B CN112648665 B CN 112648665B
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- fan
- range hood
- rotating
- resonance frequency
- supply voltage
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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
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- 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
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- 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
- F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
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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
Abstract
The invention relates to a starting control method of a range hood, which is characterized in that in the starting process of a fan, when the rotating frequency corresponding to the rotating speed of the fan is close to the resonance frequency, the power supply voltage of the fan is controlled to be increased until the rotating frequency corresponding to the rotating speed of the fan exceeds the resonance frequency, and then the power supply voltage of the fan is recovered. The starting control method of the range hood can improve the rotating speed near the resonance frequency, so that the passing through of the resonance frequency point is accelerated, and the vibration of the modal weak point of the range hood is reduced. The invention also relates to a range hood, which comprises a shell and a fan, wherein the fan comprises a volute, an impeller and a motor; a rotating shaft of the motor is sleeved with a fixed ring, the fixed ring is provided with a permanent magnet, and the periphery of the rotating shaft of the motor is provided with at least two coils which can mutually induce with the permanent magnet; a first acceleration sensor is arranged on the position, close to the volute tongue, of the volute, and a second acceleration sensor is arranged on the rear portion of the top plate of the shell. The range hood can weaken vibration in the starting process and abnormal sound caused by the vibration.
Description
Technical Field
The invention relates to a starting control method of a range hood, and also relates to a range hood applying the starting control method.
Background
The range hood has become an indispensable kitchen appliance for people since the entrance into China in the nineties of the last century. The main functions of the range hood are that oil smoke generated when a user cooks is sucked from the air inlet through the impeller of the fan system, the oil smoke is filtered by using the filter screen of the air inlet and the impeller, and the filtered oil smoke is discharged from the air outlet, so that the purification work of the kitchen environment is completed.
The range hood on the existing market generally adopts an alternating current motor, and the range hood applying the motor has the characteristics of simple structure, low cost and the like, but the range hood adopts a simpler starting mode when a control fan system is started, namely, the motor is accelerated to be near a target rotating speed by direct electrification, no special control is carried out on the starting process, in the process of accelerating the motor, the motor is equivalent to an excitation source, vibration points below the target rotating speed can be excited, the range hood mainly adopts sheet metal materials, weak modes below working points of the range hood can vibrate violently, although the vibration only occurs in the starting process, the whole machine noise at the moment is low, so that the range hood is easier to be perceived by users, the use feeling of the users is greatly influenced, and the customer experience is reduced.
The vibration that produces and the abnormal sound problem that arouses by the vibration to the lampblack absorber in the starting process in the existing market is the same strategy of keeping away the vibration under with lampblack absorber operating condition more, strengthen weak mode promptly to reduce the violent vibration that arouses because of the rotational speed point is close to the resonance point, this kind of strategy has better effect under to normal operating condition, because the normal operating point rotational speed of motor changes lessly, and the resonance point that need avoid in the lampblack absorber starting process is more, therefore this kind of mode is comparatively difficult.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a starting control method for a range hood, which can increase the rotation speed near the resonance frequency, so as to accelerate the passing through of the resonance frequency point and reduce the vibration at the modal weak point of the range hood, aiming at the prior art.
The second technical problem to be solved by the present invention is to provide a range hood capable of reducing vibration during the starting process and abnormal noise caused by the vibration, aiming at the above prior art.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a starting control method of a range hood is characterized in that: in the starting process of the fan, when the difference value that the rotating frequency corresponding to the rotating speed of the fan is smaller than the resonance frequency reaches a set value, the power supply voltage of the fan is controlled to be increased on the basis of the normal power supply voltage of the fan until the rotating frequency corresponding to the rotating speed of the fan exceeds the resonance frequency, and then the power supply voltage of the fan is recovered to the normal power supply voltage. Resonant frequency
Preferably, the starting control method of the range hood comprises the following steps:
s1, starting the range hood;
s2, controlling the fan to start with the lowest starting voltage U0;
s3, judging whether the resonance frequency a is smaller than the stable fan rotating frequency f0 corresponding to the lowest starting voltage U0, and if not, carrying out S4; if so, go to S6;
s4, controlling the power supply voltage of the fan to be a normal working voltage U, detecting in real time to obtain the rotating speed of the fan, and calculating according to the rotating speed of the fan to obtain the rotating frequency f of the fan;
s5, when f reaches a-b, controlling and increasing the power supply voltage of the fan to be U1; wherein b is a range threshold value, b is more than 0 and less than a, and U1 is more than U;
simultaneously detecting in real time to obtain the rotating speed of the fan and correspondingly calculating to obtain the rotating frequency f of the fan;
and S6, when f is larger than a + b, controlling the power supply voltage of the recovery fan to be a normal working voltage U.
According to the requirement, the resonance frequency comprises at least one resonance frequency, and the power supply voltage of the fan is controlled to be increased when the rotating frequency corresponding to the rotating speed of the fan is close to each resonance frequency.
In order to reduce the number of adjustments of the supply voltage, the resonance frequencies comprise at least two, the absolute value of the difference between two adjacent resonance frequencies being greater than 2 b.
In order to effectively solve the problem of weak modal deflection in the use process of the range hood, in the starting process of the fan, the fan rotating frequency f1 corresponding to the vibration peak signal of the range hood is detected and acquired, and if the acquired f1 is not equal to a, the resonance frequency a is updated.
The technical scheme adopted by the invention for solving the second technical problem is as follows: a range hood applying the starting control method is characterized in that: the fan comprises a volute, an impeller arranged in the volute and a motor used for driving the impeller to rotate;
the rotating shaft of the motor is sleeved with a fixing ring, the fixing ring is provided with a permanent magnet, and the periphery of the rotating shaft of the motor is provided with at least two coils which can mutually induce with the permanent magnet;
the volute is provided with a first acceleration sensor at a position close to the volute tongue, and a second acceleration sensor is arranged at the rear part of the top plate of the shell.
Preferably, four coils are uniformly arranged on the periphery of the motor rotating shaft along the circumferential direction.
Compared with the prior art, the invention has the advantages that: according to the starting control method of the range hood, when a weak mode that the rotating frequency of the fan is close to the resonance frequency occurs, the acceleration of the change of the rotating speed of the fan is improved by means of improving the power supply voltage of the fan, so that the resonance frequency is quickly passed, the vibration generated at the resonance frequency point in the starting process of a fan system and abnormal sound caused by the vibration are reduced, and the use comfort of a user is improved. The starting control method of the range hood can realize the adjustment of the rotating speed of the range hood near the resonance frequency point in the starting process, so that the rotating speed of the fan near the resonance frequency point is increased more softly, and the fan passes through the resonance frequency point in an accelerating manner.
The range hood applying the method effectively weakens the vibration of the range hood in the starting process and the abnormal sound caused by the vibration, and greatly improves the competitiveness of the range hood in the market.
Drawings
Fig. 1 is a perspective view of a range hood in an embodiment of the present invention.
Fig. 2 is an internal structure diagram of the range hood in the embodiment of the present invention.
Fig. 3 is a perspective view of a fan in an embodiment of the present invention.
Fig. 4 is a flowchart of a start control method of the range hood in the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 to fig. 3, the range hood in this embodiment includes a housing 1 and a fan 2 disposed in the housing 1, where the fan 2 includes a volute 21, an impeller 22 disposed in the volute 21, and a motor 23 for driving the impeller 22 to rotate.
The cover is equipped with solid fixed ring 231 in the pivot of motor 23, gu be equipped with permanent magnet 232 on the fixed ring 231, the periphery of motor 23 pivot is equipped with at least two coils 233 that can mutually induce with permanent magnet 232, the periphery of motor 23 pivot evenly is provided with four coils 233 along circumference, rotate the in-process at motor 23, through the mutual induction work of permanent magnet 232 and four coils 233, through the electric current condition of acquireing in four coils 233, acquire the rotational speed of motor 23, and then calculate motor 23 through motor 23 rotational speed and change frequently.
A first acceleration sensor 211 is arranged on the position of the volute casing 21 close to the volute tongue, and a second acceleration sensor 11 is arranged on the rear part of the top plate of the casing 1. The first acceleration sensor 211 and the second acceleration sensor 11 are used for detecting vibration signals in the working process of the fan 2, and are particularly used for detecting vibration signals in the starting process of the range hood, so that the rotation frequency of the fan 2 corresponding to the vibration peak signal in the starting process of the range hood is determined by combining the rotation speed information of the motor 23, and the resonance frequency used for guiding the starting of the range hood is conveniently updated.
The starting control method of the range hood in the embodiment can be applied to the range hood, and the core content of the starting control method of the range hood is as follows: in the starting process of the fan 2, when the rotating frequency corresponding to the rotating speed of the fan 2 is close to the resonance frequency, the power supply voltage of the fan 2 is controlled to be increased until the rotating frequency corresponding to the rotating speed of the fan 2 exceeds the resonance frequency, and then the power supply voltage of the fan 2 is recovered. Before leaving the factory, the range hood can acquire the resonance frequency under the weak mode in the starting process of the range hood through an early experiment, and store the resonance frequency. The number of the resonance frequencies is determined according to an actual test, and generally, the resonance frequencies are about two. The aforementioned method is adopted for each resonance frequency point during the starting process of the fan 2.
As shown in fig. 4, specifically, the starting control method of the range hood includes the following steps:
s1, starting the range hood, wherein the starting of the range hood can be judged by detecting the opening angle of the smoke baffle plate, and if the opening angle of the smoke baffle plate reaches 80% of the maximum angle, the range hood is judged to be started;
s2, controlling the fan 2 to start by using the lowest starting voltage U0, wherein the lowest starting voltage U0 is the lowest starting voltage required by the motor 23 to overcome load torque; the fan 2 is started at the lowest starting voltage U0, so that the working conditions of the motor 23 at each resonance frequency point can be more processed, and the vibration is more avoided;
s3, judging whether the resonance frequency a is smaller than the corresponding stable fan 2 rotating frequency f0 under the lowest starting voltage U0, and if not, carrying out S4; if so, go to S6;
s4, controlling the power supply voltage of the fan 2 to be a normal working voltage U, detecting in real time to obtain the rotating speed of the fan 2, and calculating according to the rotating speed of the fan 2 to obtain the rotating frequency f of the fan 2;
s5, when f reaches a-b, controlling and increasing the power supply voltage of the fan 2 to be U1; wherein b is a range threshold value, b is more than 0 and less than a, and U1 is more than U;
meanwhile, the rotating speed of the fan 2 is detected in real time and is correspondingly calculated to obtain the rotating frequency f of the fan 2;
and S6, when f is larger than a + b, controlling the power supply voltage of the fan 2 to be recovered to be a normal working voltage U.
The control of S3 to S6 is performed for each resonance frequency point, and different resonance frequencies a may correspond to the same or different regulated supply voltage U1, typically the higher the resonance frequency a, the higher the corresponding regulated supply voltage U1. When the resonance frequencies include at least two, the absolute value of the difference between two adjacent resonance frequencies is greater than 2 b. In this example, b is 1.5 HZ.
In the starting process of the fan 2, detecting and acquiring the rotating frequency f1 of the fan 2 corresponding to the vibration peak signal of the range hood, and if the acquired f1 is not equal to a, updating the resonance frequency a to be f 1. And the f1 is used as the resonance frequency when the range hood is started next time, so that the problem of weak modal deflection in the use process of the range hood is effectively solved.
According to the starting control method of the range hood, when a weak mode that the rotating frequency of the fan 2 is close to the resonance frequency occurs, the acceleration of the rotating speed change of the fan 2 is improved by means of improving the power supply voltage of the fan 2, so that the resonance frequency is quickly passed, the vibration generated at the resonance frequency point in the starting process of the fan 2 system and abnormal sound caused by the vibration are reduced, and the use comfort of a user is improved. The starting control method of the range hood can realize the adjustment of the rotating speed of the range hood near the resonance frequency point in the starting process, so that the rotating speed of the fan 2 near the resonance frequency point is increased more softly, and the fan passes through the resonance frequency point in an accelerated manner.
The range hood applying the method effectively weakens the vibration of the range hood in the starting process and the abnormal sound caused by the vibration, and greatly improves the competitiveness of the range hood in the market.
Claims (6)
1. A starting control method of a range hood is characterized in that: in the starting process of the fan (2), when the difference value that the rotating frequency corresponding to the rotating speed of the fan (2) is smaller than the resonance frequency reaches a set value, the power supply voltage of the fan (2) is controlled to be increased on the basis of the normal power supply voltage of the fan (2), and the power supply voltage of the fan (2) is restored to the normal power supply voltage after the rotating frequency corresponding to the rotating speed of the fan (2) exceeds the resonance frequency;
in the starting process of the fan (2), detecting and acquiring the rotating frequency f1 of the fan (2) corresponding to the vibration peak signal of the range hood, if the acquired f1 is not equal to a, updating the resonance frequency a to be f1, and taking f1 as the resonance frequency of the range hood at the next starting time.
2. The start-up control method of the range hood according to claim 1, characterized in that: the method comprises the following steps:
s1, starting the range hood;
s2, controlling the fan (2) to be started by the lowest starting voltage U0;
s3, judging whether the resonance frequency a is smaller than the rotating frequency f0 of the corresponding stable fan (2) under the lowest starting voltage U0, and if not, carrying out S4; if so, go to S6;
s4, controlling the power supply voltage of the fan (2) to be a normal working voltage U, detecting in real time to obtain the rotating speed of the fan (2), and calculating according to the rotating speed of the fan (2) to obtain the rotating frequency f of the fan (2);
s5, when f reaches a-b, controlling and increasing the power supply voltage of the fan (2) to be U1; wherein b is a range threshold value, b is more than 0 and less than a, and U1 is more than U;
meanwhile, the rotating speed of the fan (2) is detected in real time and the rotating frequency f of the fan (2) is obtained through corresponding calculation;
and S6, when f is larger than a + b, controlling the power supply voltage of the recovery fan (2) to be a normal working voltage U.
3. The start-up control method of the range hood according to claim 2, characterized in that: the resonance frequency comprises at least one resonance frequency, and when the rotating frequency corresponding to the rotating speed of the fan (2) is close to each resonance frequency, the power supply voltage of the fan (2) is controlled to be increased.
4. The start-up control method of the range hood according to claim 3, characterized in that: the resonance frequencies include at least two, and the absolute value of the difference between two adjacent resonance frequencies is larger than 2 b.
5. A range hood to which the start control method according to any one of claims 1 to 4 is applied, characterized in that: the fan comprises a shell (1) and a fan (2) arranged in the shell (1), wherein the fan (2) comprises a volute (21), an impeller (22) arranged in the volute (21) and a motor (23) for driving the impeller (22) to rotate;
a fixed ring (231) is sleeved on a rotating shaft of the motor (23), a permanent magnet (232) is arranged on the fixed ring (231), and at least two coils (233) capable of mutually inducing with the permanent magnet (232) are arranged on the periphery of the rotating shaft of the motor (23);
a first acceleration sensor (211) is arranged at the position, close to the volute tongue, of the volute (21), and a second acceleration sensor (11) is arranged at the rear part of the top plate of the shell (1).
6. The range hood of claim 5, wherein: the periphery of the rotating shaft of the motor (23) is uniformly provided with four coils (233) along the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110012603.3A CN112648665B (en) | 2021-01-06 | 2021-01-06 | Starting control method of range hood and range hood applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110012603.3A CN112648665B (en) | 2021-01-06 | 2021-01-06 | Starting control method of range hood and range hood applying same |
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| Publication Number | Publication Date |
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| CN112648665A CN112648665A (en) | 2021-04-13 |
| CN112648665B true CN112648665B (en) | 2022-03-18 |
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| CN202110012603.3A Active CN112648665B (en) | 2021-01-06 | 2021-01-06 | Starting control method of range hood and range hood applying same |
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| CN114382709B (en) * | 2021-12-14 | 2022-12-06 | 宁波方太厨具有限公司 | Centrifugal fan, working method of centrifugal fan and range hood |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100286027B1 (en) * | 1998-07-23 | 2001-06-01 | 윤종용 | Wall-mounted microwave oven and control method |
| US6483265B1 (en) * | 2000-05-23 | 2002-11-19 | General Electric Company | Methods and systems for minimizing vibration in electric machines |
| CN101788794A (en) * | 2009-11-27 | 2010-07-28 | 李钟平 | Resonance protection system |
| CN103742620B (en) * | 2014-01-22 | 2016-05-11 | 武汉大学 | A kind of high-power mechanical-electrical integral intelligent arrangements for speed regulation |
| CN104913355B (en) * | 2015-06-29 | 2017-10-27 | 珠海格力电器股份有限公司 | Noise treatment system, the method and device of range hood |
| KR102037833B1 (en) * | 2018-05-25 | 2019-10-29 | 린나이코리아 주식회사 | Apparatus and method for controling a range hood of lifting type for kitchen |
| IT201900000052A1 (en) * | 2019-01-03 | 2020-07-03 | Elica Spa | Hood for extracting cooking fumes comprising a dividing element for the suction duct |
| CN110726161B (en) * | 2019-10-08 | 2021-02-09 | 珠海格力电器股份有限公司 | Noise reduction control method and device for range hood, storage medium and range hood |
| CN111853891B (en) * | 2020-07-06 | 2022-01-21 | 宁波方太厨具有限公司 | Range hood and control method thereof |
| CN111998414A (en) * | 2020-09-08 | 2020-11-27 | 华帝股份有限公司 | Control method of range hood |
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