CN118128786A - Range hood and vibration reduction control method thereof - Google Patents
Range hood and vibration reduction control method thereof Download PDFInfo
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- CN118128786A CN118128786A CN202410287270.9A CN202410287270A CN118128786A CN 118128786 A CN118128786 A CN 118128786A CN 202410287270 A CN202410287270 A CN 202410287270A CN 118128786 A CN118128786 A CN 118128786A
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- electric push
- push rod
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- range hood
- impeller
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- 230000009467 reduction Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 70
- 230000001133 acceleration Effects 0.000 claims description 11
- 238000013016 damping Methods 0.000 claims description 5
- 230000033001 locomotion Effects 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims 1
- 238000013461 design Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Classifications
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
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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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ventilation (AREA)
Abstract
The invention relates to a range hood and a vibration reduction control method of the range hood, wherein the range hood comprises: the centrifugal fan comprises a volute, an impeller and a main motor; the dynamic balance adjusting device comprises a mounting bracket, a first driving motor arranged on the mounting bracket, and an electric push rod arranged on an output shaft of the first driving motor and capable of being driven by the first driving motor to rotate relative to the mounting bracket, wherein a rotating shaft line of the electric push rod, which rotates relative to the mounting bracket, is recorded as a first axis, the first axis is collinear with the axis of the main motor, the telescopic direction of a telescopic rod of the electric push rod is perpendicular to the first axis, the rotating direction of the electric push rod is opposite to the rotating direction of the impeller, and a balancing weight is further arranged at the end part of the telescopic rod of the electric push rod and can be driven by the telescopic rod of the electric push rod to change the distance between the telescopic rod and the first axis. The advantages are that: the dynamic balance of the impeller can be adaptively adjusted according to the specific use condition of the range hood, so that the vibration condition of the range hood is effectively improved.
Description
Technical Field
The invention relates to the technical field of kitchen appliances, in particular to a range hood and a vibration reduction control method of the range hood.
Background
A range hood is a kitchen appliance that purifies the kitchen environment. The range hood works by utilizing the fluid dynamics principle, and the range hood sucks and discharges oil smoke through a centrifugal fan arranged in the range hood and filters part of grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor for driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated at the center of the fan, and oil smoke below the range hood is sucked into the fan and is collected by the volute after being accelerated by the fan to be guided to be discharged out of the room.
The vibration of the range hood is mainly caused by the vibration of the motor and the unbalance of the dynamic balance of the impeller, and the dynamic balance of the whole fan system is driven to cause the vibration. These vibrations can be transmitted to the complete machine of range hood through the fixed knot of installation structure to arouse complete machine vibration, bring bad use experience for the user. The common solution is to reduce the vibration of the motor by adjusting the parameters of the motor and reduce the resonance by adjusting the dynamic balance of the impeller, changing the mode of the whole machine structure, and the like. For example, chinese patent application CN202010479376.0 (publication CN111536568 a) discloses a range hood, which is characterized in that a double-triangle support structure is arranged at the joint of the top plate and the side plate, a first vibration reduction structure is arranged on the top plate, and a second vibration reduction structure is arranged on the side plate, so that the resonance abnormal sound of the whole range hood is effectively reduced, the structural strength of the whole range hood is good, and the noise is low. The first vibration reduction structure is selected as a bidirectional vibration absorption arc structure, a double-triangle supporting structure is used as an endpoint, and the horn-shaped structure is unfolded, so that the top plate mode is changed into 116 Hz, excitation near 100 Hz is avoided, and the noise of the whole structure is reduced; the annular second vibration reduction structure changes the side plate mode into 141 Hz, avoids excitation near 100 Hz, and reduces the noise of the whole structure; the double-triangle supporting structure, the first vibration reduction structure and the second vibration reduction structure can be combined in pairs, so that the natural frequency of the whole system is high, the rigidity of the whole system is enhanced, the structural stability is ensured, and the generation of resonance abnormal sound is avoided.
However, the vibration solution of the existing range hood has certain defects: the same solution is adopted for all the range hood products, and the range hood products are disposable, namely after the whole range hood is assembled, the vibration condition of the range hood products cannot be changed, and the range hood products are more particularly subjected to modal change caused by oil dirt or external environment influence after being used for a period of time by a user, so that the vibration of the whole range hood is aggravated, and the user experience is reduced. In addition, the applicant finds that different machines with the same design scheme have different vibration conditions in the vibration noise test process, and the reason is that the impeller, the volute and the motor with the same design scheme have different modes due to clearance deviation, structural deviation and the like in the assembly process. Therefore, if the mode is improved only by modifying the structural design, only the vibration of a part of the machine can be reduced, and unbalance and vibration caused by machining errors/assembly errors cannot be solved.
Therefore, the existing range hood needs to be further improved.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide the range hood capable of adaptively adjusting the dynamic balance of the impeller according to the specific use condition of the range hood so as to effectively improve the vibration condition of the range hood.
The second technical problem to be solved by the invention is to provide a vibration reduction control method capable of adaptively adjusting the dynamic balance of an impeller according to the specific use condition of the range hood so as to effectively improve the vibration condition of the range hood.
The invention solves the first technical problem by adopting the technical scheme that: a range hood, comprising:
The centrifugal fan comprises a volute, an impeller rotationally arranged in the volute and a main motor for driving the impeller to rotate;
Further comprises:
The dynamic balance adjusting device comprises a mounting bracket fixed relative to the volute, a first driving motor arranged on the mounting bracket, and an electric push rod arranged on an output shaft of the first driving motor and capable of being driven by the first driving motor to rotate relative to the mounting bracket, wherein a rotating shaft line of the electric push rod rotating relative to the mounting bracket is recorded as a first axis, the first axis is collinear with the axis of the main motor, the expansion direction of a telescopic rod of the electric push rod is perpendicular to the first axis, the rotation direction of the electric push rod is opposite to the rotation direction of the impeller, a balancing weight is further arranged at the end part of the telescopic rod of the electric push rod, and the balancing weight can be driven by the telescopic rod of the electric push rod to change the distance between the telescopic rod and the first axis.
In order to realize firm fixation of the electric push rod, a fixed seat is arranged on an output shaft of the first driving motor, and a main body of the electric push rod is arranged on the fixed seat.
In order to realize the dynamic regulation of the vibration reduction of the range hood, the range hood further comprises a vibration state detection device for detecting the vibration state of the main motor or the impeller, the vibration state detection device and the electric push rod are electrically connected with a control system of the range hood, and the control system of the range hood can control the electric push rod to act according to the vibration state signal transmitted by the vibration state detection device so as to drive the balancing weight to move to an adaptive position.
As an improvement, the vibration state detection device includes an acceleration sensor provided on the main motor body. It is conceivable that the vibration state detecting device is not limited to monitoring the vibration acceleration of the main motor, and the dynamic balance adjusting device may be adjusted by monitoring other vibration-related parameter indexes such as the vibration acceleration of the impeller or the dynamic balance as the determination condition.
In order to drive the electric putter to rotate, the main part of first driving motor is located on the installing support, and this first driving motor's axis with the axis collineation of main motor, the main part of electric putter with first driving motor's output shaft links to each other to can rotate under first driving motor's drive.
The vibration reduction adjustment of the range hood can be realized by adjusting the position of the balancing weight on the electric push rod, and also can be realized by adjusting the rotating speed of the electric push rod, so that on the basis of 'adjusting the position of the balancing weight on the electric push rod to realize dynamic balance adjustment', a compensation means for dynamic balance adjustment is provided, and the range hood further comprises a vibration state detection device for detecting the vibration state of the main motor or the impeller, wherein the vibration state detection device and the first driving motor are electrically connected with a control system of the range hood, and the control system of the range hood can control the rotating speed of the first driving motor according to the vibration state signal transmitted by the vibration state detection device.
The invention solves the second technical problem by adopting the technical proposal that: a vibration reduction control method of a range hood comprises the following steps: after the main motor of the range hood is driven, the vibration state detection device detects the vibration state of the main motor or the impeller and acquires the vibration state signal of the main motor or the impeller, when the vibration detection state detection value reaches or exceeds a set threshold value, the dynamic balance adjustment device is started to sequentially adjust the position of the balancing weight on the electric push rod and the rotating speed interval of the electric push rod until the vibration detection state detection value of the main motor or the impeller is smaller than the set threshold value.
As an improvement, the vibration damping control method of the range hood comprises the following steps:
s1, starting a centrifugal fan, wherein the rotating speed of a main motor is stabilized in a set rotating speed interval [ S n-1,Sn ] within a continuous set time, the main motor is positioned in different rotating speed intervals [ S n-1,Sn ], and the vibration state set threshold a n of the main motor or the impeller is also different, wherein the vibration state set threshold a n of the main motor or the impeller corresponds to the rotating speed interval [ S n-1,Sn ] where the main motor is positioned one by one;
S2, detecting the vibration state of a main motor or an impeller by a vibration state detection device, acquiring a vibration state signal of the main motor or the impeller under the current working condition, judging whether a current vibration detection state detection value A 0 reaches or exceeds a set threshold value a n, if so, starting a dynamic balance adjustment device, driving an electric push rod to rotate by a first driving motor and stabilizing the electric push rod in a set rotating speed interval, simultaneously driving a balancing weight to move a set distance from a position closest to a first axis to a position far away from the first axis by the electric push rod, detecting the vibration state of the main motor or the impeller again by the vibration state detection device after each position movement of the balancing weight is adjusted in place, acquiring a current vibration detection state detection value A n, judging whether the balancing weight moves to a terminal limit position, and then entering a step S3; if not, not starting the dynamic balance adjusting device;
S3, if A n≥an is carried out and the balancing weight does not move to the end limit position of the electric push rod, continuing to drive the balancing weight to move to one end far away from the first axis by the electric push rod for a set distance, detecting the vibration state of the main motor or the impeller again through the vibration state detection device, acquiring a current vibration detection state detection value, judging whether the balancing weight moves to the end limit position or not, repeating the step, and if A n≥an is carried out and the balancing weight has moved to the end limit position of the electric push rod, entering step S4;
And S4, judging the magnitude of the current vibration detection state detection value A n and the vibration detection state detection value A n-1 of the balancing weight in the last position state, if A n≥An-1, reducing the rotating speed of the electric push rod, returning to the step S2, if A n＜An-1, increasing the rotating speed of the electric push rod, and returning to the step S2.
10. The vibration reduction control method of a range hood according to claim 9, wherein: the balancing weight is driven by the electric push rod to sequentially move from the position closest to the first axis to one end far away from the first axis, and the set distances are the same or sequentially reduced.
Compared with the prior art, the invention has the advantages that: on the basis of not changing the traditional design frame of the range hood, the self-adaptive dynamic balance adjusting device is added on the fan system to dynamically balance vibration caused in the motion process of the main motor and the impeller, wherein the dynamic balance adjusting device comprises a balancing weight which is arranged on a telescopic rod of the electric push rod, the balancing weight and the electric push rod reversely rotate relative to the impeller through power provided by the first driving motor, and the rotating moment is adjusted through adjusting the rotating radius of the balancing weight through the electric push rod, so that the dynamic balance of the impeller is adaptively adjusted according to specific use conditions of the range hood, and the vibration condition of the range hood is effectively improved. Compared with the traditional vibration reduction scheme of the range hood, the vibration reduction scheme of the range hood can be automatically adjusted according to the specific use condition of the range hood, the range hood is wider in application scene and better in experience, and the dynamic balance adjusting device can be used as an independent module to be attached to a mature whole machine and is not limited by a certain model or a whole machine structure.
Drawings
Fig. 1 is a schematic perspective view of a centrifugal fan of a range hood according to an embodiment of the present invention;
fig. 2 is a right side view of a centrifugal fan of the range hood according to an embodiment of the present invention;
Fig. 3 is a schematic perspective view of a dynamic balance adjusting device of a range hood according to an embodiment of the present invention;
Fig. 4 is a flowchart of a vibration damping control method of a range hood according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
In the description and claims of the present invention, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present invention, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the invention may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.
Fig. 1 to 4 show a preferred embodiment of a range hood and a vibration damping control method of the range hood according to the present invention. The range hood comprises a shell, a centrifugal fan arranged in the shell and a dynamic balance adjusting device. The centrifugal fan comprises a volute 10, an impeller 11 arranged in the volute 10 and a main motor 12 driving the impeller 11 to rotate. When the impeller 11 rotates, negative pressure suction is generated at the center of the fan, and the oil fume below the range hood is sucked into the fan, is accelerated by the fan, is collected by the volute 10, and is guided to be discharged out of the room. The main body of the main motor 12 is usually mounted on the rear cover plate of the volute 10, i.e. at the rear air inlet of the volute 10, by means of a motor bracket 13.
The dynamic balance adjusting device comprises a mounting bracket 21, a first driving motor 24, an electric push rod 22, a balancing weight 23 and a vibration state detecting device. The mounting bracket 21 is mounted on the rear cover plate of the volute 10 (of course, may also be mounted on the main body of the main motor 12), the mounting bracket 21 includes a plate area in the middle and four support arms connected to the plate in the middle, the plate structure in the middle is used for placing the components such as the first driving motor 24 and the electric push rod 22, and the four support arms are used for connecting with the rear cover plate of the volute 10. The first drive motor 24 includes a first drive motor 24, the first drive motor 24 being fixed to the flat plate region of the mounting bracket 21, and an axis of an output shaft of the first drive motor 24 being collinear with an axis of an output shaft of the main motor 12. The extending direction (i.e., the telescoping direction) of the electric putter 22 is substantially perpendicular to the output shaft of the first drive motor 24. The output shaft of the first driving motor 24 is provided with a fixing seat 241, the main body of the electric push rod 22 is mounted on the fixing seat 241, and the first driving motor 24 can drive the electric push rod 22 to rotate, wherein the rotating shaft line of the electric push rod 22 rotating relative to the mounting bracket 21 is denoted as a first axis, and the first axis is collinear with the axis of the main motor 12 and the axis of the first driving motor 24. The rotation direction of the electric push rod 22 is opposite to the rotation direction of the impeller 11. The electric push rod 22 has a telescopic rod 220, and a counterweight 23 is provided at an end of the telescopic rod 220. When the telescopic rod 220 of the electric push rod 22 extends, the balancing weight 23 is far away from the first axis, and when the telescopic rod 220 of the electric push rod 22 retracts, the balancing weight 23 is close to the first axis, so that the position of the balancing weight 23 relative to the rotation center of the balancing weight 23 is adjusted.
The vibration state detecting means is a vibration state detecting means for detecting the vibration state of the main motor 12 or the impeller 11, and preferably, the vibration state detecting means in the present embodiment includes an acceleration sensor 25 provided on the main body of the main motor 12, the acceleration sensor 25 being electrically connected to the control system of the range hood. It is conceivable that the vibration state detecting means is not limited to monitoring the vibration acceleration of the main motor 12, and that the dynamic balance adjusting means may be adjusted by monitoring other vibration-related parameter indexes such as the vibration acceleration of the impeller 11 or the dynamic balance as the determination condition.
The first driving motor 24 and the electric push rod 22 are electrically connected with a control system of the range hood, and the control system of the range hood can control the electric push rod 22 to act according to the vibration state signal transmitted by the vibration state detection device so as to drive the balancing weight 23 to move to the matched position and control the rotating speed of the first driving motor 24 according to the vibration state signal transmitted by the vibration state detection device. In general, vibration reduction adjustment of the range hood can be achieved by adjusting the position of the balancing weight 23 on the electric push rod 22, or by adjusting the rotation speed of the electric push rod 22, in this embodiment, the rotation speed adjustment of the electric push rod 22 is used as a compensation means for dynamic balance adjustment on the basis of "adjusting the position of the balancing weight 23 on the electric push rod 22 to achieve dynamic balance adjustment", that is, when "adjusting the position of the balancing weight 23 on the electric push rod 22 cannot effectively achieve dynamic balance adjustment", the rotation speed of the electric push rod 22 is adjusted.
The embodiment also relates to a vibration reduction control method of the range hood, which comprises the following steps: after the main motor 12 of the range hood is driven, the vibration state detection device detects the vibration state of the main motor 12 or the impeller 11 and obtains the vibration state signal of the main motor 12 or the impeller 11, when the vibration detection state detection value reaches or exceeds a set threshold value, the dynamic balance adjustment device is started to sequentially adjust the position of the balancing weight 23 on the electric push rod 22 and the rotating speed interval of the electric push rod 22 until the obtained vibration detection state detection value of the main motor 12 or the impeller 11 is smaller than the set threshold value. Referring still specifically to fig. 3, the vibration damping control method includes the steps of:
S1, starting a centrifugal fan, wherein the rotating speed of a main motor 12 is stabilized in a set rotating speed interval [ S n-1,Sn ] within a continuous set time, and because different gears of the centrifugal fan correspond to different rotating speeds, the user has different requirements on the vibration of the whole machine, so that different vibration acceleration thresholds are required to be set for different rotating speed intervals, when the whole machine works, firstly judging the rotating speed interval of the main motor 12, and then judging whether to start an adaptive balance mechanism according to the acceleration threshold corresponding to the rotating speed interval, wherein the vibration state set threshold a n of the main motor 12 or an impeller 11 corresponds to the rotating speed interval [ S n-1,Sn ] where the main motor 12 is located, specifically, the mapping relation between the two can be obtained in advance according to experimental tests, for example:
| Rotational speed segment | S0-S1 | S1-S2 | S2-S3 | …… | Sn-1-Sn |
| Motor vibration acceleration threshold | a1 | a2 | a3 | …… | an |
S2, detecting the vibration state of the main motor 12 or the impeller 11 by a vibration state detection device, acquiring a vibration state signal of the main motor 12 or the impeller 11 under the current working condition, judging whether the current vibration detection state detection value A 0 reaches or exceeds a set threshold value a n, if so, starting a dynamic balance adjustment device, driving the electric push rod 22 to rotate by the first driving motor 24 and stabilizing the electric push rod 22 in a set rotating speed interval, simultaneously driving the balancing weight 23 to move a set distance from the position closest to the rotating center of the electric push rod 22 to one end far away from the rotating center by the electric push rod 22, wherein the rotating speed interval of the electric push rod 22 when the dynamic balance adjustment device is started can be positioned in the middle of each rotating speed interval of the electric push rod 22, detecting the vibration state of the main motor 12 or the impeller 11 again by the vibration state detection device after each position movement of the balancing weight 23 is adjusted in place, acquiring the current vibration detection state detection value A n, judging whether the balancing weight 23 moves to the end limit position or not, and then entering the step S3; if not, not starting the dynamic balance adjusting device;
s3, if A n≥an is carried out and the balancing weight 23 does not move to the end limit position of the electric push rod 22, continuing to drive the balancing weight 23 to move to one end far away from the rotation center by the electric push rod 22 for a set distance, detecting the vibration state of the main motor 12 or the impeller 11 again through the vibration state detection device, acquiring a current vibration detection state detection value, judging whether the balancing weight 23 moves to the end limit position or not, repeating the step, and if A n≥an is carried out and the balancing weight 23 has moved to the end limit position of the electric push rod 22, entering step S4;
S4, judging the magnitude of the current vibration detection state detection value A n and the vibration detection state detection value A n-1 of the balancing weight 25 in the last position state, if A n≥An-1 indicates that the rotating speed of the rotating arm 22 is too high and exceeds the range of the centrifugal fan to be regulated, reducing the rotating speed of the rotating arm 22, returning to the step S2, if A n＜An-1 indicates that the rotating speed of the rotating arm 22 is too high and cannot meet the requirement of the centrifugal fan to be regulated, increasing the rotating speed of the rotating arm 22, and returning to the step S2.
In the above steps, the setting distances that the balancing weights 23 are sequentially moved from the position closest to the rotation center of the electric push rod 22 to the end far from the rotation center may be the same or may be sequentially reduced, preferably, the distances that the balancing weights 23 are moved each time are sequentially reduced, so as to improve the accuracy of dynamic balance adjustment of the impeller 11 of the range hood.
The detection of the extension rod 220 of the electric putter 22 to the end limit position may be performed by configuring a corresponding travel switch, or may be performed by detecting a change in a current signal of the motor of the electric putter 22. The detection modes are all the prior art and are not described herein.
The range hood of this embodiment adds one set of self-adaptation dynamic balance adjusting device on fan system on the basis of not changing range hood traditional design frame, dynamic balance main motor 12 and the vibration that causes in the impeller 11 motion process, wherein, dynamic balance adjusting device contains balancing weight 23, balancing weight 23 installs on electric putter 22's telescopic link 220, balancing weight 23 and electric putter 22 carry out the counter-rotation for impeller 11 through the power that first driving motor 24 provided, adjust the rotation moment through electric putter 22 adjusting balancing weight 23's radius of rotation, and then realize carrying out the adaptability adjustment to impeller 11's dynamic balance according to range hood specific use condition, effectively improved range hood's vibration condition. Compared with the traditional vibration reduction scheme of the range hood, the vibration reduction scheme of the range hood can be automatically adjusted according to the specific use condition of the range hood, the range hood is wider in application scene and better in experience, and the dynamic balance adjusting device can be used as an independent module to be attached to a mature whole machine and is not limited by a certain model or a whole machine structure.
Claims (10)
1. A range hood, comprising:
the centrifugal fan comprises a volute (10), an impeller (11) rotationally arranged in the volute (10) and a main motor (12) for driving the impeller (11) to rotate;
Characterized by further comprising:
The dynamic balance adjusting device comprises a mounting bracket (21) fixed relative to the volute (10), a first driving motor (24) arranged on the mounting bracket (21) and an electric push rod (22) arranged on an output shaft of the first driving motor (24) and capable of being driven by the first driving motor (24) to rotate relative to the mounting bracket (21), a rotating axis of the electric push rod (22) relative to the mounting bracket (21) is recorded as a first axis, the first axis is collinear with an axis of the main motor (12), the telescopic direction of a telescopic rod (220) of the electric push rod (22) is perpendicular to the first axis, the rotating direction of the electric push rod (22) is opposite to the rotating direction of the impeller (11), a balancing weight (23) is further arranged at the end part of the telescopic rod (220) of the electric push rod (22), and the balancing weight (23) can be driven by the telescopic rod (220) of the electric push rod (22) to change the distance between the telescopic rod and the first axis.
2. The range hood of claim 1, wherein: the output shaft of the first driving motor (24) is provided with a fixed seat (241), and the main body of the electric push rod (22) is arranged on the fixed seat (241).
3. The range hood of claim 1, wherein: the motor driving device is characterized by further comprising a vibration state detection device for detecting the vibration state of the main motor (12) or the impeller (11), wherein the vibration state detection device and the electric push rod (22) are electrically connected with a control system of the range hood, and the control system of the range hood can control the electric push rod (22) to act according to a vibration state signal transmitted by the vibration state detection device so as to drive the balancing weight (23) to move to an adaptive position.
4. A range hood according to claim 3, wherein: the vibration state detection device comprises an acceleration sensor (25) arranged on the main body of the main motor (12).
5. The range hood according to any one of claims 1 to 4, wherein: the main body of the first driving motor (24) is arranged on the mounting bracket (21), the axis of the first driving motor (24) is collinear with the axis of the main motor (12), and the main body of the electric push rod (22) is connected with the output shaft of the first driving motor (24), so that the electric push rod can rotate under the drive of the first driving motor (24).
6. The range hood of claim 5, wherein: the control system of the range hood is capable of controlling the rotating speed of the first driving motor (24) according to the vibration state signal transmitted by the vibration state detection device.
7. A vibration damping control method of a range hood according to any one of claims 1 to 6, comprising the steps of: after a main motor (12) of the range hood is driven, a vibration state detection device detects the vibration state of the main motor (12) or the impeller (11) and acquires a vibration state signal of the main motor (12) or the impeller (11), when the vibration detection state detection value reaches or exceeds a set threshold value, a dynamic balance adjustment device is started to sequentially adjust the position of a balancing weight (23) on an electric push rod (22) and the rotating speed interval of the electric push rod (22) until the vibration detection state detection value of the main motor (12) or the impeller (11) is smaller than the set threshold value.
8. The vibration reduction control method of a range hood according to claim 7, comprising the steps of:
S1, starting a centrifugal fan, wherein the rotating speed of a main motor (12) is stabilized in a set rotating speed interval [ S n-1,Sn ] within a continuous set time, the main motor (12) is positioned in different rotating speed intervals [ S n-1,Sn ], and the vibration state set threshold value a n of the main motor (12) or an impeller (11) is also different, wherein the vibration state set threshold value a n of the main motor (12) or the impeller (11) corresponds to the rotating speed interval [ S n-1,Sn ] of the main motor (12) one by one;
S2, detecting the vibration state of a main motor (12) or an impeller (11) by a vibration state detection device, acquiring a vibration state signal of the main motor (12) or the impeller (11) under the current working condition, judging whether a current vibration detection state detection value A 0 reaches or exceeds a set threshold value a n, if so, starting a dynamic balance adjustment device, driving an electric push rod (22) to rotate by a first driving motor (24) and stabilizing the electric push rod in a set rotating speed interval, simultaneously driving a balancing weight (23) to move a set distance from a position closest to a first axis to a position far away from the first axis by the electric push rod (22), detecting the vibration state of the main motor (12) or the impeller (11) again by the vibration state detection device after each position movement adjustment is completed, acquiring a current vibration detection state detection value A n, judging whether the balancing weight (23) moves to a terminal limit position or not, and then entering a step S3; if not, not starting the dynamic balance adjusting device;
S3, if A n≥an is carried out and the balancing weight (23) does not move to the end limit position of the electric push rod (22), continuing to drive the balancing weight (23) to move to one end far away from the first axis by the electric push rod (22) for a set distance, then detecting the vibration state of the main motor (12) or the impeller (11) again through the vibration state detection device, acquiring a current vibration detection state detection value, judging whether the balancing weight (23) moves to the end limit position or not, and then repeating the step, and if A n≥an is carried out, and the balancing weight (23) moves to the end limit position of the electric push rod (22), entering step S4;
S4, judging the magnitude of the vibration detection state detection value A n in the current vibration detection state detection value A n-1 in the state of the last position of the balancing weight (23), if A n≥An-1, reducing the rotating speed of the electric push rod (22) and returning to the step S2, and if A n＜An-1, increasing the rotating speed of the electric push rod (22) and returning to the step S2.
9. The vibration reduction control method of a range hood according to claim 8, wherein: the balancing weights (23) are driven by the electric push rods (22) to sequentially move from the position closest to the first axis to one end far away from the first axis, and the set distances are the same.
10. The vibration reduction control method of a range hood according to claim 8, wherein: the balancing weight (23) is driven by the electric push rod (22) to sequentially move from the position closest to the first axis to one end far away from the first axis, and the set distance sequentially decreases.
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