CN115807777A - Centrifugal fan, range hood and control method thereof - Google Patents
Centrifugal fan, range hood and control method thereof Download PDFInfo
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- CN115807777A CN115807777A CN202211582872.4A CN202211582872A CN115807777A CN 115807777 A CN115807777 A CN 115807777A CN 202211582872 A CN202211582872 A CN 202211582872A CN 115807777 A CN115807777 A CN 115807777A
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a centrifugal fan, a range hood and a control method thereof, wherein the centrifugal fan comprises a volute and an impeller arranged in the volute, the volute comprises two cover plates which are arranged at intervals, a ring wall arranged between the cover plates and an air outlet; the centrifugal fan further comprises a volute tongue component, the volute tongue component comprises a tongue part, a scroll and a spring piece, the tongue part is located between the end part of the annular wall and the air outlet, and one end of the tongue part is fixedly connected with the scroll; the reel is rotationally connected between the two cover plates, the rotating axis of the reel is parallel to the axial direction of the impeller, and the reel is kept in a tightening state; the spring piece is attached to one side, facing the outside of the volute, of the tongue portion, the part, corresponding to the spring piece, of the tongue portion forms a volute tongue, the volute tongue is kept in an arc shape through the spring piece, one end of the spring piece is wound in a direction parallel to the axial direction of the impeller, and therefore the radius of the volute tongue can be changed by adjusting the winding amount of the end portion of the spring piece, and the radial tongue gap is kept unchanged during adjustment.
Description
Technical Field
The invention relates to a power device, in particular to a centrifugal fan, a range hood applying the centrifugal fan and a control method of the range hood.
Background
The multi-wing centrifugal fan is widely applied to various household appliances such as an air conditioner, a range hood, an air freshener, a ventilator and the like due to the advantages of compact structure, high pressure coefficient, large flow coefficient, low noise and the like. The volute tongue radius of the multi-wing centrifugal fan and the width of the outlet throat have important influence on the aerodynamic performance and noise of the multi-wing centrifugal fan.
The volute tongue is used for preventing a small part of gas from circularly flowing in the volute of the fan. Under the condition of small air exhaust resistance, the outlet of the fan flows smoothly, the radius of the volute tongue is small, so that the separation of outlet air flow is facilitated, the circular flow of air in the volute can be reduced, and meanwhile, the impact area is small during the separation of air flow, so that the reduction of noise is facilitated; under the condition of large air exhaust resistance, the flow state of the outlet of the fan is relatively disordered, the radius of the volute tongue is large, the on-way loss of outlet turbulent flow flowing back to the inner area of the volute can be increased, and the forward pressure gradient area near the volute tongue can be increased during air flow separation, so that the resistance of the fan is improved, and the noise reduction is facilitated.
The width of the throat part of the fan outlet is defined as the width of a line segment which is formed by intersecting the fan volute outlet and the volute outlet section in parallel through the circle center of the volute tongue along the projection direction of the thickness of the volute and directly influences the exhaust capacity of the fan. Under the condition of small air exhaust resistance, the width of the outlet throat part is large, the internal resistance of the fan is small, air exhaust is smooth, and noise reduction is facilitated. Under the condition of larger air exhaust resistance, the width of the throat part of the outlet is smaller, so that on one hand, the shielding of the volute tongue on the impeller is increased, and the direct impact of outlet turbulent flow on the impeller can be reduced; on the other hand, when the impeller is guided to throw the air flow to the air outlet, the air flow is more concentrated and less dispersed, the backflow under high-resistance working conditions can be resisted, the deterioration of the outlet disorder state on the flow field in the volute is weakened, the noise reduction is facilitated, the too small condition is also unfavorable, the exhaust internal resistance of the fan is increased, and the unfavorable noise reduction is also realized.
Ordinary fan is just stereotyped once the design processing is accomplished, and fan volute tongue radius, export throat width all can't be adjusted, then can't compromise different resistance operating mode situations when using, influence user experience.
Some technologies adjust the radial tongue gap by changing the radius of the volute tongue, for example, a volute tongue and a centrifugal fan with the volute tongue are disclosed in the chinese patent with the application number 201711451180.5, the volute tongue comprises a support frame and a flexible volute tongue wall arranged on the support frame to form the outer contour of the volute tongue, the support frame comprises an upper support body and a lower support body arranged at the root of the volute tongue and an R-variable cylinder arranged at the head of the volute tongue, the upper support body, the lower support body and the R-variable cylinder are distributed in a triangular shape, and the support frame further comprises a driving mechanism for driving the R-variable cylinder to rotate.
The centrifugal fan can realize the reduction of the radial tongue clearance when the radius of the variable R cylinder volute tongue is reduced, but simultaneously can reduce the width of the outlet throat of the fan, and the law of the influence of the reduction of the width of the outlet throat of the fan, the reduction of the radius of the volute tongue and the reduction of the radial tongue clearance on the performance of the fan is opposite. For a particular operating condition, if it is advantageous to reduce the volute tongue radius and the diametric tongue clearance, then the reduction in the width of the outlet throat of the fan is disadvantageous; if the volute tongue radius is reduced and the radial tongue gap is reduced disadvantageously, the reduction of the width of the outlet throat of the fan is favorable; the increase of the radial tongue clearance can be realized when the radius of the variable R cylinder volute tongue is increased, but the width of the outlet throat of the fan is increased, and the influence rule of the increase of the width of the outlet throat of the fan, the increase of the radius of the volute tongue and the increase of the radial tongue clearance on the performance of the fan is also opposite. In summary, the adjustment of the radial tongue clearance does not necessarily have a beneficial effect on the performance of the fan.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a centrifugal fan to ensure that the adjustment of the volute tongue structure has a beneficial effect on the performance of the centrifugal fan, in view of the above-mentioned deficiencies in the prior art.
The second technical problem to be solved by the invention is to provide a range hood with the centrifugal fan.
The third technical problem to be solved by the invention is to provide a control method of the centrifugal fan.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a centrifugal fan comprises a volute and an impeller arranged in the volute, wherein the volute comprises two cover plates arranged at intervals, a ring wall arranged between the cover plates and an air outlet, and the air outlet is formed by the cover plates and the ring wall in a surrounding mode; the method is characterized in that:
the centrifugal fan further comprises a volute tongue component, the volute tongue component comprises a tongue part, a scroll and a spring piece, the tongue part is located between the end part of the annular wall and the air outlet, one end of the tongue part is fixed with the annular wall or the cover plate, and the other end of the tongue part is fixedly connected with the scroll;
the reel is rotationally connected between the two cover plates, the rotating axis of the reel is parallel to the axial direction of the impeller, and the reel is kept in a tightening state;
the spring piece is tightly attached to one side, facing the outside of the volute, of the tongue portion, the part, corresponding to the spring piece, of the tongue portion forms a volute tongue, the volute tongue is kept in an arc shape through the spring piece, one end of the spring piece is fixed to the annular wall or the cover plate, the other end of the spring piece is wound around the direction parallel to the axial direction of the impeller, therefore, the winding quantity of the end portion of the spring piece is adjusted, the radius of the volute tongue can be changed, and the winding end portion of the spring piece can move linearly, so that a radial tongue gap formed between the volute tongue and the impeller is kept unchanged.
The radius of the volute tongue is adjusted on the premise of ensuring that the gap of the diameter tongue is not changed through the arrangement of the structure, the radius of the volute tongue is increased, the width of the throat part of the fan outlet is reduced, the radius of the volute tongue is increased, and the influence rule of the reduction of the width of the throat part of the fan outlet on the performance of the fan is consistent; the volute tongue radius is reduced, the width of the outlet throat of the fan is increased, the influence rule of the volute tongue radius reduction and the width increase of the outlet throat of the fan on the performance of the fan is consistent, and no extra volute structure size parameter changes exist during adjustment, so that the adjustment of the structure can bring favorable influence on the performance of the fan, the fan performance and noise are in the best working state under different resistance working conditions, and the user experience is improved.
Further, in order to adjust the radius of the spring plate, the volute tongue assembly further comprises a first driving mechanism, the first driving mechanism is a curling motor module, and the first driving mechanism is in transmission connection with the end portion of the spring plate and can change the radius of the spring plate by adjusting the curling amount of the end portion of the spring plate.
Furthermore, in order to facilitate the movement of the driving spring piece and ensure that the radial tongue gap is not changed, the volute tongue assembly further comprises a second driving mechanism, the second driving mechanism is a linear driving module, the output end of the second driving mechanism is in transmission connection with the first driving mechanism, and the motion direction of the output end of the second driving mechanism is consistent with the connecting line of the circle center of the volute tongue and the circle center of the impeller.
The technical scheme adopted by the invention for solving the second technical problem is as follows: a range hood, its characterized in that: a centrifugal fan as described above is applied.
The technical scheme adopted by the invention for solving the third technical problem is as follows: a control method of the range hood is characterized in that:
1) Starting the range hood, restoring the radius of the volute tongue to the initial state, wherein the radius of the volute tongue is minimum and R 0 ；
2) Starting the centrifugal fan to obtain the input current I of the centrifugal fan under the current working condition N ；
3) Adjusting the radius of the volute tongue to I according to the corresponding relation between the pre-stored input current and the volute tongue radius N Corresponding R N 。
Preferably, the corresponding relationship between the input current of the centrifugal fan and the radius of the volute tongue is obtained through the following steps:
s1) firstly, restoring the radius of the volute tongue to an initial state, wherein the radius of the volute tongue is minimum, and recording that the radius of the volute tongue in the state is R 0 ；
S2) connecting the centrifugal fan with a smoke exhaust pipe, and adjusting smoke exhaustThe resistance of the rear end of the tube is marked as P from small to large 0 、P 1 、P 2 、…、P N N is the number of preset resistance values, and the input current corresponding to the centrifugal fan under each resistance is recorded as I 0 、I 1 、I 2 、…、I 0 ；
S3) determining the optimal volute tongue radius R under each resistance through experiments 0 、R 1 、R 2 、…、R N (ii) a Optimal here means that the flow is maximized and the noise is minimized at each resistance.
Further, since the stored current value is limited, in order to facilitate each situation to correspond to the limited current value, in step 2), the current satisfies I by detecting the actual input current I of the centrifugal fan at present N ≤I＜I N+1 When the current input current of the centrifugal fan is determined to be I N 。
In order to adapt to sudden change of the working condition, in the step 3), when the change of the input current of the centrifugal fan exceeds a threshold value, automatically restoring the volute tongue radius to an initial state, detecting the current input current of the centrifugal fan, and then adjusting the volute tongue radius to a state corresponding to the current input current.
Compared with the prior art, the invention has the advantages that: the radius of the volute tongue is adjusted on the premise of ensuring that the gap of the diameter tongue is not changed through the arrangement of the structure, the radius of the volute tongue is increased, the width of the outlet throat of the fan is reduced, the radius of the volute tongue is increased, and the influence rule of the reduction of the width of the outlet throat of the fan on the performance of the fan is consistent; the volute tongue radius is reduced, the width of the outlet throat of the fan is increased, the influence rule of the volute tongue radius reduction and the width increase of the outlet throat of the fan on the performance of the fan is consistent, and no extra volute structure size parameter changes exist during adjustment, so that the adjustment of the structure can bring favorable influence on the performance of the fan, the fan performance and noise are in the best working state under different resistance working conditions, and the user experience is improved.
Drawings
FIG. 1 is a schematic structural diagram of a centrifugal fan according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a centrifugal fan according to an embodiment of the present invention (higher resistance);
FIG. 3 is an enlarged view of a portion I of FIG. 2;
FIG. 4 is a schematic view of a volute tongue assembly of a centrifugal fan in accordance with an embodiment of the present invention;
FIG. 5 is a partial cross-sectional view of a centrifugal fan of an embodiment of the present invention (less drag);
fig. 6 is a partial sectional view (initial state, no resistance) of a centrifugal fan according to 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 "center," "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 orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity of description, and do not 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 only and are not to be construed as limiting, for example, "upper" and "lower" are not necessarily limited to directions opposite 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 to 4, a centrifugal fan includes a scroll casing 1 and an impeller 2 disposed in the scroll casing 1. The volute 1 comprises two cover plates 11 arranged at intervals, a ring wall 12 arranged between the cover plates 11 and an air outlet 13, wherein the air outlet 13 is defined by the cover plates 11 and the ring wall 12.
The centrifugal fan further comprises a volute tongue assembly comprising a tongue 14, a spool 15, a spring plate 16, a first drive mechanism 17 and a second drive mechanism 18. The tongue portion 14 has a certain thickness and moderate hardness, and can be deformed to a certain extent, preferably, it is made of rubber, and the position of the tongue portion 14 is, as in the prior art, between the end portion of the annular wall 12 (the molded line of the annular wall 12 is usually a spiral line, and the end is the starting point of the spiral line) and the air outlet 13. One end of the tongue 14 is fixed to the annular wall 12 or the cover 11, and the other end of the tongue 14 is fixedly connected to the reel 15. The reel 15 is rotatably connected between the two cover plates 11 and has an axis of rotation axially parallel to the impeller 2. The reel 15 is an elastic reel, can rotate around its own axis under the action of external force, and can keep its own tightening state when no external force is applied, so that the purpose of adjusting the partial area of the tongue portion 14 is achieved.
The retention of the shape of the tongue 14 depends on the tension of the leaf spring 16, the leaf spring 16 also being located between the annular wall 12 and the outlet mouth 13, abutting against the tongue 14 on the side facing outwards from the volute 1. One end of the spring piece 16 is fixed with the annular wall 12 or the cover plate 11, and the other end of the spring piece 16 is in transmission connection with the output end of the first driving mechanism 17. The tongue portion 14 and the spring piece 16 form a volute tongue 141, the volute tongue can be kept in an arc shape through the spring piece 16, the first driving mechanism 17 is a curling motor module, and the curling amount of the spring piece 16 (the curling axial direction is parallel to the axial direction of the impeller 2) is controlled and adjusted through the first driving mechanism 17 to keep the volute tongue in an arc state with different diameters, so that the purpose of changing the radius of the volute tongue 141 and the width of the throat 19 (the space between the volute tongue 141 and the opposite side of the annular wall 12) is achieved.
In the process of adjusting the radius of the volute tongue 141, the position of the first driving mechanism 17 needs to be adjusted to ensure that the radial tongue clearance (the distance between the periphery of the impeller 2 and the volute tongue 141) of the centrifugal fan is not changed, and adverse effects on the performance and noise of the fan are avoided. The position of the first driving mechanism 17 is controlled by the second driving mechanism 18, the second driving mechanism 18 is a linear driving module, such as an electric push rod, a motor gear and rack combination, etc., which is fixed on the annular wall 12 or the cover plate 11 and is in transmission connection with the first driving mechanism 17, for example, the first driving mechanism 17 can be fixed with the output end of the second driving mechanism 18 by a driving connecting frame 20, and the moving direction of the output end of the second driving mechanism 18 is consistent with the connecting line of the circle center of the volute tongue 141 and the circle center of the impeller 2 (two circle centers located on the same plane perpendicular to the axis of the impeller 2). In this embodiment, the second driving mechanism 18 is an electric push rod, and the moving direction of the push rod is consistent with the connecting line between the volute tongue 141 and the center of the impeller 2.
When the resistance is lower, the first driving mechanism 17 rotates clockwise in the view direction shown in fig. 3 to contract back, and the second movement mechanism 18 retracts synchronously, the radius of the volute tongue 141 becomes smaller, and the width of the fan outlet throat 19 increases; in the operating condition of high resistance, when the first driving mechanism 17 rotates counterclockwise in the direction of view shown in fig. 3 and expands outward, and the second moving mechanism 18 extends synchronously, the radius of the volute tongue 141 increases, and the width of the fan outlet throat 19 decreases.
When the centrifugal fan is applied to the range hood, the access pipeline starts to be used, and the method for controlling the adjustment of the volute tongue component comprises the following steps:
1) Starting the range hood, and restoring the radius of the volute tongue 141 to the initial state;
2) Starting the centrifugal fan, adapting to the pipe network resistance state to obtain the current input current I of the centrifugal fan N ；
3) Then the first drive mechanism 17 and the second drive mechanism 18 are controlled to adjust the radius of the volute tongue 141 to I according to the pre-stored relation between the input current and the radius N Corresponding R N Thereby giving consideration to the use under different resistance working conditions.
In the above step, the correspondence between the input current and the radius is obtained by:
s1) first, the radius of the volute tongue 141 is restored to the initial state, at this time, the radius of the volute tongue 141 is minimum, and the width of the throat 19 is maximum, see fig. 6; remember that the radius of the volute tongue 141 in this state is R 0 ；
S2) connecting the centrifugal fan with a smoke exhaust pipe, adjusting the resistance of the rear end of the smoke exhaust pipe, and sequentially recording the given resistance values from small to large as P 0 、P 1 、P 2 、…、P N Wherein the resistance is 0 (theThe optimal volute tongue radius under resistance is R 0 ) N is the number of preset resistance values; recording the corresponding input current of the centrifugal fan under each resistance as I 0 、I 1 、I 2 、…、I N (ii) a Generally, after the centrifugal fan is shaped and a control circuit is determined, corresponding currents under different resistances are determined, and each resistance corresponds to one current, so that input currents corresponding to different resistances can be obtained;
s3) determination of the respective resistances (P) by tests 0 、P 1 、P 2 、…、P N ) The radius of the lower optimum volute tongue 141 (the width of the outlet throat is correspondingly adjusted in a linkage way) is respectively R 0 、R 1 、R 2 、…、R N (ii) a The best condition refers to the condition that the flow is maximum and the noise is minimum under the working condition;
in the stored relation, the input current value is limited, so in the step 2), the actual input current I of the current centrifugal fan is detected, and when the current meets I N ≤I＜I N+1 When the current input current of the centrifugal fan is determined to be I N 。
In addition, in step 3), when actually used, the input current may be I 0 、I 1 、I 2 、…、I N The current value segmentation is carried out, for example, when there is no resistance, the input current may be 0.5A, and as the resistance increases gradually, the input current may have values of 0.55, 0.60, 0.65 … … 1.00A, etc., so that the segmentation may be 0.5-0.575, 0.575-0.62 … …. The segmentation needs to be divided according to the range of the current and the fluctuation degree of the current corresponding to different resistances.
If the change of the input current of the centrifugal fan is detected to exceed the threshold value in the using process, the exceeding of the threshold value is that the change exceeds a preset fixed value or the change jumps from one current subsection interval to another current subsection interval, the radius of the volute tongue 141 is automatically restored to the initial state, the input current of the current centrifugal fan is detected and compared, and then the first driving mechanism 17 and the second driving mechanism 18 are controlled to adjust the radius of the volute tongue 141 to the state corresponding to the current input current.
Claims (8)
1. A centrifugal fan comprises a volute (1) and an impeller (2) arranged in the volute (1), wherein the volute (1) comprises two cover plates (11) arranged at intervals, a circular wall (12) arranged between the cover plates (11) and an air outlet (13), and the air outlet (13) is formed by the cover plates (11) and the circular wall (12) in a surrounding mode; the method is characterized in that:
the centrifugal fan further comprises a volute tongue assembly, the volute tongue assembly comprises a tongue portion (14), a scroll (15) and a spring piece (16), the tongue portion (14) is located between the end portion of the annular wall (12) and the air outlet (13), one end of the tongue portion (14) is fixed with the annular wall (12) or the cover plate (11), and the other end of the tongue portion (14) is fixedly connected with the scroll (15);
the reel (15) is rotationally connected between the two cover plates (11) and the rotating axis of the reel is parallel to the axial direction of the impeller (2), and the reel (15) is kept in a tightening state;
the spring piece (16) is tightly attached to one side, facing the outside of the volute (1), of the tongue portion (14), the part, corresponding to the spring piece (16), of the tongue portion (14) forms a volute tongue (141), the volute tongue (141) is kept in an arc shape through the spring piece (16), one end of the spring piece (16) is fixed with the annular wall (12) or the cover plate (11), the other end of the spring piece (16) is wound around the direction parallel to the axial direction of the impeller (2), therefore, the winding amount of the end portion of the spring piece (16) can be adjusted, the radius of the volute tongue (141) can be changed, and the winding end portion of the spring piece (16) can do linear motion, so that the radial tongue gap formed between the volute tongue (141) and the impeller (2) is kept unchanged.
2. The centrifugal fan of claim 1, wherein: the volute tongue component also comprises a first driving mechanism (17), the first driving mechanism (17) is a coiling motor module, and the first driving mechanism (17) is in transmission connection with the end part of the spring piece (16) and can change the radius of the spring piece (16) by adjusting the coiling amount of the end part of the spring piece (16).
3. The centrifugal fan of claim 2, wherein: the volute tongue component further comprises a second driving mechanism (18), the second driving mechanism (18) is a linear driving module, the output end of the second driving mechanism (18) is in transmission connection with the first driving mechanism (17), and the motion direction of the output end of the second driving mechanism (18) is consistent with the connecting line of the circle center of the volute tongue (141) and the circle center of the impeller (2).
4. A range hood, its characterized in that: use of a centrifugal fan according to any of claims 1-3.
5. A control method of a range hood as claimed in claim 4, wherein:
1) Starting the range hood, and restoring the radius of the volute tongue (141) to the initial state, wherein the radius of the volute tongue (141) is minimum and R 0 ；
2) Starting the centrifugal fan to obtain the input current I of the centrifugal fan under the current working condition N ；
3) According to the prestored corresponding relation between the input current and the radius of the volute tongue (141), the radius of the volute tongue (141) is adjusted to I N Corresponding R N 。
6. The control method of the range hood according to claim 5, characterized in that: the corresponding relation between the input current of the centrifugal fan and the radius of the volute tongue (141) is obtained by the following steps:
s1) firstly, the radius of the volute tongue (141) is restored to the initial state, the radius of the volute tongue (141) is the minimum at the moment, and the radius of the volute tongue (141) in the state is recorded as R 0 ；
S2) connecting the centrifugal fan with a smoke exhaust pipe, adjusting the resistance of the rear end of the smoke exhaust pipe, and sequentially recording the given resistance values from small to large as P 0 、P 1 、P 2 、…、P N N is the number of preset resistance values, and the input current corresponding to the centrifugal fan under each resistance is recorded as I 0 、I 1 、I 2 、…、I N ；
S3) determining the optimal radius of the volute tongue (141) under each resistance to be R through experiments 0 、R 1 、R 2 、…、R N (ii) a Optimal here means that the flow is maximized and the noise is minimized at each resistance.
7. The control method of the range hood according to claim 6, characterized in that: in the step 2), the actual input current I of the centrifugal fan is detected, and when the current meets I N ≤I＜I N+1 When the current input current of the centrifugal fan is determined to be I N 。
8. The control method of the range hood according to claim 5, wherein: in the step 3), when the change of the input current of the centrifugal fan exceeds a threshold value, the radius of the volute tongue (141) is automatically restored to the initial state, the current input current of the centrifugal fan is detected, and then the radius of the volute tongue (141) is adjusted to the state corresponding to the current input current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211582872.4A CN115807777A (en) | 2022-12-09 | 2022-12-09 | Centrifugal fan, range hood and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211582872.4A CN115807777A (en) | 2022-12-09 | 2022-12-09 | Centrifugal fan, range hood and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115807777A true CN115807777A (en) | 2023-03-17 |
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|---|---|---|---|
| CN202211582872.4A Pending CN115807777A (en) | 2022-12-09 | 2022-12-09 | Centrifugal fan, range hood and control method thereof |
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| CN (1) | CN115807777A (en) |
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- 2022-12-09 CN CN202211582872.4A patent/CN115807777A/en active Pending
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