CN114251283A - Centrifugal fan, air outlet control method and device and range hood - Google Patents

Centrifugal fan, air outlet control method and device and range hood Download PDF

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Publication number
CN114251283A
CN114251283A CN202011028870.1A CN202011028870A CN114251283A CN 114251283 A CN114251283 A CN 114251283A CN 202011028870 A CN202011028870 A CN 202011028870A CN 114251283 A CN114251283 A CN 114251283A
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China
Prior art keywords
centrifugal fan
volute tongue
air outlet
volute
fan
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Granted
Application number
CN202011028870.1A
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Chinese (zh)
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CN114251283B (en
Inventor
边乐超
崔福浩
张野
何福添
李伟
刘华春
汪耀东
李忠华
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Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
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Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
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Priority to CN202011028870.1A priority Critical patent/CN114251283B/en
Publication of CN114251283A publication Critical patent/CN114251283A/en
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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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • 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
    • 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
    • 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
    • F04D27/002—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying geometry within the pumps, e.g. by adjusting vanes
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/422—Discharge tongues
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Abstract

The invention discloses a centrifugal fan, an air outlet control method, an air outlet control device and a range hood, wherein the centrifugal fan comprises a shell structure of the centrifugal fan, a centrifugal wind wheel, a flow velocity measuring device and a control device, the shell structure of the centrifugal fan comprises a volute, a volute tongue and an adjusting mechanism, the volute defines an installation cavity and an air outlet channel extending from one side of the installation cavity, the volute tongue extends towards the center of the air outlet channel and is arranged in a protruding manner, at least part of the volute tongue is arranged in a telescopic manner in the extending direction, the adjusting mechanism is used for correspondingly adjusting the telescopic movement of the telescopic portion of the volute tongue, the flow velocity measuring device is used for monitoring the flow velocity parameter of a fan air outlet of the centrifugal fan, the control device is used for controlling the adjusting mechanism to act according to the obtained flow velocity parameter of the fan air outlet, the device is suitable for different working conditions, has the effects of reducing noise and increasing static pressure, is convenient to realize automatic adjustment, and improves user experience.

Description

Centrifugal fan, air outlet control method and device and range hood
Technical Field
The invention relates to the technical field of range hoods, in particular to a centrifugal fan, an air outlet control method and device and a range hood.
Background
The volute tongue in the centrifugal fan mainly functions to split the airflow at the outlet of the volute, when the airflow rate is high at the outlet with large air quantity, a shallow volute tongue is adopted to reduce the impact of the airflow on the volute tongue and reduce noise, when the pipeline resistance is high, a deep volute tongue is adopted to reduce the backflow at the volute tongue and improve the back pressure resistance of the range hood, and the airflow is not uniformly distributed in the axial direction of the volute.
Disclosure of Invention
In view of this, the centrifugal fan provided by the invention achieves the effect of adjusting the depth of the volute tongue in sections according to different working conditions, and can achieve the effects of reducing noise and increasing static pressure in most working conditions, however, how to adjust the depth of the volute tongue in sections according to different working conditions corresponding to flow rate parameters of the air outlet of the fan is an urgent problem to be solved.
In order to achieve the above object, the present invention provides a centrifugal fan comprising:
the centrifugal fan comprises a shell structure of the centrifugal fan, wherein the shell structure of the centrifugal fan comprises a volute, a volute tongue and an adjusting mechanism, the volute defines a mounting cavity for mounting a centrifugal wind wheel and an air outlet channel extending from one side of the mounting cavity, the volute tongue is arranged at the junction of the air outlet channel and the mounting cavity, extends towards the center of the air outlet channel and is arranged in a protruding mode, at least part of the volute tongue is arranged in a telescopic mode in the extending direction of the volute tongue in a telescopic mode, and the adjusting mechanism is used for correspondingly adjusting the telescopic movement of the telescopic part of the volute tongue;
the centrifugal wind wheel is rotatably arranged in the mounting cavity;
the flow velocity measuring device is used for monitoring the flow velocity parameter of the fan air outlet of the centrifugal fan; and the number of the first and second groups,
and the control device is electrically connected with the flow velocity measuring device and used for controlling the action of the adjusting mechanism according to the obtained flow velocity parameters of the air outlet of the fan.
In an embodiment, the flow velocity measuring device includes a first anemometer tube, and the total pressure hole of the first anemometer tube is configured to be disposed opposite to an airflow at the air outlet of the centrifugal fan.
In one embodiment, the air outlet of the centrifugal fan is provided with a first air outlet pipe, a rectification grid is arranged in the first air outlet pipe, and the rectification grid is used for dividing an inner cavity of the first air outlet pipe into a plurality of pipe flow channels which are arranged in parallel;
the first air speed pipe is positioned on one side, back to the air outlet of the centrifugal fan, of the rectifying grating and corresponds to one of the pipe runners.
In one embodiment, the rectifying grid comprises a plurality of grid plates arranged in a staggered manner.
In an embodiment, a direction in which the volute extends along the circumferential direction of the air outlet duct is taken as a length direction of the volute, the volute tongue comprises a plurality of volute tongue segments which are mutually connected along the length direction of the volute tongue, and at least one volute tongue segment corresponds to an adjustable part of the volute tongue.
In one embodiment, the plurality of volute tongue segments comprises a first volute tongue segment and at least two second volute tongue segments on two sides of the first volute tongue segment;
the radius of curvature of the flow dividing surface of the first volute tongue section is smaller than that of the flow dividing surface of the second volute tongue section.
In one embodiment, the adjustment mechanism includes a linear drive structure mounted to the volute housing, the drive end of the linear drive structure being drivingly connected to the adjustable portion of the volute tongue.
The invention also provides a range hood, which comprises a centrifugal fan, wherein the centrifugal fan comprises:
the centrifugal fan comprises a shell structure of the centrifugal fan, wherein the shell structure of the centrifugal fan comprises a volute, a volute tongue and an adjusting mechanism, the volute defines a mounting cavity for mounting a centrifugal wind wheel and an air outlet channel extending from one side of the mounting cavity, the volute tongue is arranged at the junction of the air outlet channel and the mounting cavity, extends towards the center of the air outlet channel and is arranged in a protruding mode, at least part of the volute tongue is arranged in a telescopic mode in the extending direction of the volute tongue in a telescopic mode, and the adjusting mechanism is used for correspondingly adjusting the telescopic movement of the telescopic part of the volute tongue;
the centrifugal wind wheel is rotatably arranged in the mounting cavity;
the flow velocity measuring device is used for monitoring the flow velocity parameter of the fan air outlet of the centrifugal fan; and the number of the first and second groups,
and the control device is electrically connected with the flow velocity measuring device and used for controlling the action of the adjusting mechanism according to the obtained flow velocity parameters of the air outlet of the fan.
The invention also provides an air outlet control method of the centrifugal fan, which comprises the following steps:
acquiring an actual fan air outlet flow velocity parameter of the centrifugal fan;
obtaining an actual adjusting parameter according to the obtained actual fan outlet flow velocity parameter and a first mapping relation, wherein the first mapping relation is a corresponding incidence relation between the fan outlet flow velocity parameter and the adjusting parameter;
and controlling the movement of the adjusting mechanism according to the obtained actual adjusting parameters.
The invention also provides an air outlet control device of the centrifugal fan, which comprises the following components: the control method comprises the following steps of:
acquiring an actual fan air outlet flow velocity parameter of the centrifugal fan;
obtaining an actual adjusting parameter according to the obtained actual fan outlet flow velocity parameter and a first mapping relation, wherein the first mapping relation is a corresponding incidence relation between the fan outlet flow velocity parameter and the adjusting parameter;
and controlling the movement of the adjusting mechanism according to the obtained actual adjusting parameters.
In the technical scheme of the invention, the centrifugal fan comprises a shell structure of the centrifugal fan, a centrifugal wind wheel, a flow velocity measuring device and a control device, wherein a volute tongue extends towards the center of the air outlet channel and is arranged in a protruding manner, at least part of the volute tongue is arranged in a telescopic manner in the protruding direction, the adjusting mechanism is used for correspondingly adjusting the telescopic movement of the telescopic portion of the volute tongue, the control device monitors the flow velocity parameter of the air outlet of the fan through the flow velocity measuring device to control the action of the adjusting mechanism, the depth of the volute tongue at different positions can be adjusted through the adjusting action of the adjusting mechanism to adapt to the condition that the airflow is not uniformly distributed in the axial direction of the volute under different working conditions, the effects of reducing noise and increasing static pressure are achieved, and meanwhile, the depth distribution in the length direction of the volute tongue is automatically adjusted according to the flow velocity parameter of the air outlet of the fan, the automatic adjustment is convenient to realize, and the user experience is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic perspective view of a centrifugal fan according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of the worm tongue of FIG. 1 engaged with the adjustment mechanism (at an angle);
FIG. 3 is a schematic perspective view of the worm tongue of FIG. 1 engaged with the adjustment mechanism (at another angle);
FIG. 4 is a schematic diagram of a control structure of the centrifugal fan of FIG. 1;
fig. 5 is a schematic perspective view of an embodiment of a range hood including the centrifugal fan in fig. 1;
FIG. 6 is a schematic view of a partial cross-sectional structure of the range hood of FIG. 5;
fig. 7 is a schematic partial cross-sectional perspective view of the range hood of fig. 5 (with a first outlet duct at a first angle);
fig. 8 is a schematic partial cross-sectional perspective view of the range hood of fig. 5 (with a second air outlet pipe at a first angle);
fig. 9 is a schematic partial cross-sectional perspective view of the range hood of fig. 5 (at a second angle);
fig. 10 is a schematic perspective view of the range hood in fig. 5 (at a third angle) in partial cross-section;
fig. 11 is an enlarged schematic view of a portion a of fig. 10.
FIG. 12 is a diagram illustrating a server architecture of a hardware operating environment according to an embodiment of the present invention;
fig. 13 is a schematic flow chart of an embodiment of an air outlet control method of a centrifugal fan according to the present invention.
The reference numbers illustrate:
Figure BDA0002701077830000041
Figure BDA0002701077830000051
the objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" and/or "appears throughout, the meaning includes three parallel schemes, for example," A and/or B "includes scheme A, or scheme B, or a scheme satisfying both schemes A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The volute tongue in the centrifugal fan mainly functions to split the airflow at the outlet of the volute, when the airflow rate is high at the outlet with large air quantity, a shallow volute tongue is adopted to reduce the impact of the airflow on the volute tongue and reduce noise, when the pipeline resistance is high, a deep volute tongue is adopted to reduce the backflow at the volute tongue and improve the back pressure resistance of the range hood, and the airflow is not uniformly distributed in the axial direction of the volute.
In view of this, the present invention provides a range hood, which includes a centrifugal fan, where the centrifugal fan includes a shell structure of the centrifugal fan, and all of the range hoods including the shell structure of the centrifugal fan belong to the protection scope of the present invention, and similarly, all of the range hoods including the centrifugal fan belong to the protection scope of the present invention, where fig. 1 to 4 are schematic diagrams of embodiments of the centrifugal fan provided by the present invention, and fig. 5 to 10 are schematic diagrams of embodiments of the range hood provided by the present invention.
Referring to fig. 1 to 4, in an embodiment of the present invention, the centrifugal fan 100 includes a housing structure of the centrifugal fan, a centrifugal wind wheel 4, a flow rate measuring device and a control device 300, the housing structure of the centrifugal fan includes a volute 1, a volute tongue 2 and an adjusting mechanism 3, the volute 1 defines a mounting cavity for mounting the centrifugal wind wheel 4 and an air outlet channel 11 extending from one side of the mounting cavity, the volute tongue 2 is disposed at a junction of the air outlet channel 11 and the mounting cavity, and extends and protrudes toward a center of the air outlet channel 11, at least a portion of the volute tongue 2 is telescopically disposed in a protruding direction thereof, the adjusting mechanism 3 is configured to correspondingly adjust a portion of telescopic movement of the volute tongue 2, the centrifugal wind wheel 4 is rotatably mounted in the mounting cavity, the flow rate measuring device is configured to monitor a fan outlet flow rate parameter of the centrifugal fan 100, the control device 300 is electrically connected with the flow velocity measuring device and is used for controlling the action of the adjusting mechanism 3 according to the obtained flow velocity parameters of the air outlet of the fan.
In the technical scheme of the invention, the centrifugal fan 100 comprises a housing structure of the centrifugal fan, a centrifugal wind wheel 4, a flow velocity measuring device and a control device 300, wherein the volute tongue 2 extends and protrudes towards the center of the air outlet channel 11, at least part of the volute tongue 2 is telescopically arranged in the protruding direction, the adjusting mechanism 3 is used for correspondingly adjusting the telescopic movement of the telescopically adjustable part of the volute tongue 2, the control device 300 monitors the flow velocity parameter of the air outlet of the fan through the flow velocity measuring device to control the action of the adjusting mechanism 3, the depth of different positions of the volute tongue 2 can be adjusted through the adjusting action of the adjusting mechanism 3 to adapt to the condition that airflow is not uniformly distributed in the axial direction of the volute 1 under different working conditions, the effects of reducing noise and increasing static pressure are achieved, and meanwhile, the depth distribution in the length direction of the volute tongue 2 is automatically adjusted according to the flow velocity parameter of the air outlet of the fan, the automatic adjustment is convenient to realize, and the user experience is improved.
In an embodiment, a direction in which the volute casing 1 extends along the circumferential direction of the air outlet duct is taken as a length direction of the volute casing, the volute casing 2 includes a plurality of volute casing segments connected with each other along the length direction, at least one of the volute casing segments corresponds to an adjustable portion of the volute casing 2, and the volute casing 2 is arranged in a segmented manner and the volute casing 2 is adjusted in a segmented manner, so that the adjustment of the volute casing 2 is facilitated.
In one embodiment, the volute tongue 2 has a flow dividing surface formed at one end in the protruding direction, the flow dividing surface of each volute tongue segment is arranged in an arc curved surface, and the flow dividing surface of each volute tongue segment is arranged in a curved surface to facilitate the formation of flow division in the volute casing 1, so that the airflow resistance is reduced.
The distribution of the air flow velocity of the volute casing 1 in the axial plane is uneven, and the conditions of high flow velocity near the central disk and low flow velocity at two sides can occur, in an embodiment, the plurality of volute tongue sections include a first volute tongue section 21 and at least two second volute tongue sections 22 at two sides of the first volute tongue section 21, the curvature radius of the flow dividing surface of the first volute tongue section 21 is smaller than that of the flow dividing surface of the second volute tongue section 22, at this time, the volute tongue section correspondingly positioned in the middle is a pointed volute tongue 2, and the volute tongues 2 correspondingly positioned at two sides are flat volute tongues 2, so that the distribution of air is facilitated, and the backflow at the volute tongues 2 is reduced.
In an embodiment, referring to fig. 3, the curvature radius of the first volute tongue section 21 is R1, and R1 is greater than or equal to 5mm and less than or equal to 11mm, and the curvature radius of the second volute tongue section 22 is R2, and R2 is greater than or equal to 3mm and less than or equal to 9mm, so that the arrangement is more beneficial to gas distribution and reduction of backflow at the volute tongue 2, preferably, R1 is 8mm, and R2 is 6 mm.
The adjusting mechanism 3 adjusts the depth of the volute tongue 2 according to different working conditions, for example, the resistance at the outlet of the fan is too large, the airflow velocity at the volute tongue 2 is small, and the static pressure is increased on the premise of keeping the air volume due to the requirement of smoke discharge so as to overcome the resistance of smoke discharge, at the moment, the volute tongue 2 protruding outwards in the middle is adopted, which is beneficial to the shunting of airflow, reduces the backflow at the volute tongue 2 and increases the static pressure; the resistance at the outlet of the fan is moderate, the comprehensive requirements of air quantity and static pressure are considered, and a volute tongue 2 with relatively flat middle is adopted; the resistance at the outlet of the fan is too small, the airflow velocity at the volute tongue 2 is large, and high-speed airflow can impact the volute tongue 2 to generate high-frequency pneumatic noise, so that the volute tongue 2 with the middle part relatively concave inwards is adopted, the impact of the high-speed airflow on the volute tongue 2 can be reduced, and the noise is reduced.
In an embodiment, referring to fig. 2, the plurality of volute tongue segments includes a first volute tongue segment 21 and at least two second volute tongue segments 22 located at two sides of the first volute tongue segment 21, in a protruding direction of the volute tongue 2, the first volute tongue segment 21 has a first adjusting position protruding outward relative to the two second volute tongue segments 22, a second adjusting position recessed inward, and a transition adjusting position located between the first adjusting position and the second adjusting position, when the volute tongue 2 is at the first adjusting position, the first adjusting position corresponds to the volute tongue 2 protruding outward in the middle, which is beneficial to splitting airflow and reducing backflow at the volute tongue 2, and increasing static pressure, the second adjusting position corresponds to the volute tongue 2 capable of reducing impact of high-speed airflow on the volute tongue 2 and reducing noise, and the adjusting mechanism 3 adjusts the volute tongue 2 at the first adjusting position, The transition adjustment position and the second adjustment position are switched to adapt to adjustment requirements under different working conditions, so that effects of reducing noise and increasing static pressure are achieved.
The adjusting mechanism 3 is used for correspondingly adjusting the telescopic movement of the telescopically adjustable part of the volute tongue 2, the invention does not limit the specific driving mode of the adjusting mechanism 3, in an embodiment, the adjusting mechanism 3 comprises a linear driving structure 31, the linear driving structure 31 is installed on the volute casing 1, the driving end of the linear driving structure 31 is in driving connection with the adjustable part of the volute tongue 2, the adjustable part of the volute tongue 2 is driven to move through the linear driving structure 31, and the structure is relatively simple.
The present invention is not limited to the specific structural form of the linear driving structure 31, for example, the linear driving structure 31 may be one of an air cylinder, an oil cylinder or an electric push rod, and in an embodiment, the linear driving structure 31 is an electric push rod, which is convenient for using an automatic control situation.
In the embodiment that the volute tongue 2 comprises a plurality of volute tongue sections, and each volute tongue section is adjustable, the linear driving structure 31 is provided in a plurality of corresponding volute tongue sections, so that the linear driving structure plays a role in controlling and adjusting respectively, and the depth distribution of the volute tongue 2 in the length direction can be changed conveniently and rapidly, so that the use requirements under different working conditions can be met rapidly.
Referring to fig. 4 to 6, the centrifugal fan 100 according to the present invention includes a housing structure of the centrifugal fan and the centrifugal wind wheel 4 rotatably mounted in a mounting cavity of the housing structure of the centrifugal fan, and since the centrifugal fan 100 includes all technical features described in the embodiment of the housing structure of the centrifugal fan, the centrifugal fan has all technical effects described in the embodiment of the housing structure of the centrifugal fan, which is not described in detail herein.
Referring to fig. 4, the adjusting mechanism 3 of the centrifugal fan 100 in the present invention is automatically adjusted by a control device 300, in an embodiment, the centrifugal fan 100 further includes a monitoring device 200 and a control device 300, the monitoring device 200 is used to monitor a working parameter of the centrifugal fan 100, and the control device 300 is electrically connected to the monitoring device 200, and is used to control the adjusting mechanism 3 to operate according to the obtained working parameter, and automatically adjust the depth distribution of the volute tongue 2 in the length direction according to different working conditions, so as to facilitate automatic adjustment and improve user experience.
Different working parameters may reflect the working state of the centrifugal fan 100, in an embodiment, the working parameters include at least one of a fan outlet flow rate parameter, a fan outlet static pressure parameter, a motor power parameter, and a wind wheel rotation speed parameter, and it should be noted that, in the case that the control device 300 controls the adjusting mechanism 3 to operate according to the obtained working parameters, the operating parameters may be one of the above parameters, or may be a combination of any two or three of the above parameters, so as to comprehensively feed back the working state of the centrifugal fan 100.
In order to obtain the flow rate parameter of the air outlet of the fan, in an embodiment, the monitoring device 200 includes a flow rate measuring device disposed at the air outlet of the centrifugal fan 100, and is configured to measure the flow rate at the air outlet of the centrifugal fan 100, so that the flow rate at the air outlet of the centrifugal fan 100 can be conveniently obtained, and the working state of the centrifugal fan 100 can be well reflected.
In an embodiment, referring to fig. 7, the flow velocity measurement device includes a first air velocity tube 201, a total pressure hole 2011 of the first air velocity tube 201 is configured to be disposed opposite to an air flow of the air outlet of the centrifugal fan 100, a total pressure Pt of a gas on the speed measurement tube is obtained through the total pressure hole 2011, a static pressure Ps of the gas is obtained through a first static pressure hole 2012, and a corresponding conversion formula is used to obtain the static pressure Ps of the gas
Figure BDA0002701077830000091
The flow velocity of the gas flowing through the first air velocity pipe 201 can be obtained, and thus the measurement is accurate, it should be noted that the method of measuring the air velocity at the air outlet of the centrifugal fan 100 by using the first air velocity pipe 201 is adopted in the prior art, and will not be described in detail here.
The air flow of the air speed at the air outlet of the centrifugal fan 100 is not uniform, and the flow speed of the air flow measured by the first air speed pipe 201 cannot well reflect the gas flow state on the whole air outlet duct, in an embodiment, the air outlet of the centrifugal fan 100 is provided with a first air outlet pipe 205, a rectification grid 202 is arranged in the first air outlet pipe 205, the rectification grid 202 is used for dividing the inner cavity of the first air outlet pipe 205 into a plurality of pipe flow channels arranged in parallel, the first air speed pipe 201 is positioned on one side of the rectification grid 202, which is opposite to the air outlet of the centrifugal fan 100, and is arranged corresponding to one of the pipe flow channels, the air flow is uniformly distributed in each pipe flow channel by the rectification function of the rectification grid 202, and the gas of the local air flow measured by the first air speed pipe 201 can reflect the whole gas flow speed condition on the air outlet duct, has better effect.
In one embodiment, the grille shutter 202 includes a plurality of grille plates disposed in a staggered manner, and the overall duct of the first outlet duct 205 is conveniently divided into a plurality of duct channels by the staggered grille plates.
In order to obtain the static pressure parameter at the air outlet of the fan, the monitoring device 200 includes a static pressure measuring device disposed at the air outlet of the centrifugal fan 100 for measuring the static pressure parameter at the air outlet of the fan, and the static pressure measuring device may be measured by a differential pressure gauge, in an embodiment, please refer to fig. 8, the static pressure measuring device includes a second air outlet pipe 206 disposed at the air outlet of the centrifugal fan 100, a second air speed pipe 207 is disposed in the second air outlet pipe 206, and a second static pressure hole 208 is disposed on a side wall of the second air speed pipe 207, so that the static pressure in the second air speed pipe 207 can be conveniently obtained, and the static pressure parameter at the air outlet of the fan can be further obtained.
Of course, the above-mentioned rectification grating 202 may also be used to rectify the airflow in the second air outlet pipe 206, so that the airflow is uniformly distributed in the second air outlet pipe 206, and the gas of the local airflow measured by the second air speed pipe 207 may reflect the overall gas flow speed on the air outlet duct, thereby achieving a better effect.
In order to obtain the power parameter of the motor, in an embodiment, the monitoring device 200 includes a power monitoring device for monitoring the output power of the driving motor of the wind wheel, so that the output power of the driving motor of the wind wheel can be conveniently obtained, and the working state of the centrifugal fan 100 can be well reflected.
In an embodiment, referring to fig. 9, the power monitoring device includes a current sensor 203 for monitoring a current of the driving motor of the centrifugal wind wheel 4, and the current sensor 203 may be disposed on a bus of the driving motor to directly obtain the current of the driving motor, so as to conveniently obtain a motor power of the driving motor.
In order to obtain the rotational speed parameter of the wind wheel, in an embodiment, the monitoring device 200 includes a rotational speed monitoring device for monitoring the rotational speed of the wind wheel, so that the rotational speed of the wind wheel can be conveniently obtained, and the working state of the centrifugal fan 100 can be well reflected.
Monitoring centrifugal wind wheel 4's rotational speed, can adopt photoelectric encoder method of testing the speed, hall element method of testing the speed, magnetic leakage method of testing the speed and so on the mode of testing the speed, in an embodiment, please refer to fig. 10 and 11, rotational speed monitoring devices includes reflected photoelectric measuring device 204, reflected photoelectric measuring device 204 includes laser emitter 2041, laser receiver 2042 and reflector plate 2043, laser emitter 2041 locates on the spiral case 1, laser receiver 2042 locates on the spiral case 1, reflector plate 2043 locates on the wind wheel piece, wherein, laser emitter 2041 sends light, the warp behind the reflector plate reflection, by laser receiver 2042 receives, so set up, can accurately obtain centrifugal wind wheel 4's rotational speed.
The present invention further provides a range hood 1000, where the range hood 1000 includes the centrifugal fan 100, and since the range hood 1000 includes all the technical features described in the embodiment of the centrifugal fan 100, the range hood has all the technical effects described in the embodiment of the centrifugal fan 100, and details are not repeated here.
Referring to fig. 12, fig. 12 is a schematic structural diagram of the air outlet control device of the centrifugal fan of the present invention.
As shown in fig. 12, the centrifugal fan air outlet control device may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 12 does not constitute a limitation of the centrifugal fan wind control device and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in fig. 12, a memory 1005, which is a kind of computer storage medium, may include an operating system, a network communication module, a user interface module, and a centrifugal fan outlet control program.
In the server shown in fig. 12, the network interface 1004 is mainly used for connecting a terminal device and performing data communication with the terminal device; the user interface 1003 is mainly used for receiving input instructions of an administrator; the server calls the centrifugal fan air-out control program stored in the memory 1005 through the processor 1001, and executes the following operations:
acquiring actual working parameters of the centrifugal fan 100;
obtaining an actual adjusting parameter according to the obtained actual working parameter and a first mapping relation, wherein the first mapping relation is a corresponding association relation between the working parameter and the adjusting parameter;
and controlling the adjusting mechanism 3 to move according to the obtained actual adjusting parameters.
Based on the above hardware structure, fig. 13 is an embodiment of the method for controlling air outlet of the centrifugal fan according to the present invention.
Referring to fig. 13, in the present embodiment, the method for controlling air outlet of a centrifugal fan includes the following steps:
step S10, acquiring actual working parameters of the centrifugal fan 100;
it should be noted that the working parameters of the centrifugal fan 100 include a fan outlet flow speed parameter, a fan outlet static pressure parameter, a motor power parameter, a wind wheel rotation speed parameter, and the like, and are mainly obtained by monitoring through the monitoring device 200, for example, the fan outlet flow speed parameter may be obtained by measuring total pressure and static pressure through the first wind speed pipe 201 and obtaining through a corresponding relational expression, for example, the fan outlet static pressure parameter may be obtained by directly measuring, for example, directly measuring by using the static pressure pipe or the second wind speed pipe 207, for example, the motor power parameter may be obtained by obtaining a bus wind wheel current on the driving motor of the wind wheel through the current sensor 203, and for example, the wind wheel rotation speed parameter may be measured by a rotation speed measuring device.
Step S20, obtaining actual adjusting parameters according to the obtained actual working parameters and the first mapping relation;
it should be noted that the first mapping relationship is a corresponding association relationship between the operating parameter and the adjusting parameter, and is a control program that needs to be written into the controller, and for a specific model, there is a specific correspondence relationship, and the step specifically written into the control program of the controller includes:
obtaining a second mapping relation corresponding to the static pressure and the air quantity of the centrifugal fan 100;
obtaining a third mapping relation according to the second mapping relation and the working parameters, wherein the third mapping relation is a corresponding association relation between the working parameters and the air volume;
obtaining the first mapping relation according to the third mapping relation and the adjusting parameter;
it should be noted that, when a certain specific model is subjected to an air performance test, a second mapping relationship corresponding to static pressure and air volume may be obtained, a third mapping relationship may be obtained according to flow conversion, and the first mapping relationship may be obtained according to the third mapping relationship and an adjustment parameter, where the adjustment parameter is associated with the working parameter.
Step S30, controlling the movement of the adjusting mechanism 3 according to the obtained actual adjusting parameters;
it should be noted that after the actual adjustment parameters are obtained, the adjustment mechanism 3 may be directly driven to move, for example, the adjustment mechanism 3 adjusts the depth of the volute tongue 2 according to different working conditions, for example, the resistance at the outlet of the fan is too large, the airflow velocity at the volute tongue 2 is small, and because of the requirement of smoke exhaust, the static pressure needs to be increased on the premise of keeping the air volume to overcome the resistance of smoke exhaust, at this time, the volute tongue 2 protruding outward in the middle is adopted, which is beneficial to the diversion of the airflow, reduces the backflow at the volute tongue 2, and increases the static pressure; the resistance at the outlet of the fan is moderate, the comprehensive requirements of air quantity and static pressure are considered, and a volute tongue 2 with relatively flat middle is adopted; the resistance at the outlet of the fan is too small, the airflow velocity at the volute tongue 2 is large, and high-speed airflow can impact the volute tongue 2 to generate high-frequency pneumatic noise, so that the volute tongue 2 with the middle part relatively concave inwards is adopted, the impact of the high-speed airflow on the volute tongue 2 can be reduced, and the noise is reduced.
According to the invention, the actual working parameters of the centrifugal fan 100 are obtained, the actual adjusting parameters are obtained according to the obtained actual working parameters and the first mapping relation, and the movement of the adjusting mechanism 3 is controlled according to the obtained actual adjusting parameters, so that the adjusting mechanism 3 is automatically driven to adjust the movement of the volute tongue 2 according to the working state of the centrifugal fan 100, the condition that airflow is not uniformly distributed in the axial direction of the volute 1 under different working conditions is adapted, and the effects of reducing noise and increasing static pressure are achieved.
In one embodiment, the plurality of volute tongue segments includes a first volute tongue segment 21 and at least two second volute tongue segments 22 on both sides of the first volute tongue segment 21, in the protruding direction of the volute tongue 2, the first volute tongue segment 21 has a first adjusting position protruding outward relative to the two second volute tongue segments 22, a second adjusting position recessed inward, and a transition adjusting position between the first adjusting position and the second adjusting position, and the first mapping relationship is:
when the working parameter meets a first preset condition, controlling the adjusting mechanism 3 to move so that the first volute tongue section 21 is in the first adjusting position;
when the working parameter meets a second preset condition, controlling the adjusting mechanism 3 to move so that the first volute tongue section 21 is in the second adjusting position;
when the working parameter meets a third preset condition, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is located at the transition adjusting position.
In the embodiment of the present invention, different preset conditions are set, so as to control the movement of the adjusting mechanism 3 more accurately, and the adjusting mechanism can be more adapted to the condition that the airflow is not uniformly distributed in the axial direction of the volute 1 under different working conditions, so as to achieve the effects of reducing noise and increasing static pressure.
It should be noted that, different preset conditions exist according to different working parameters, and the following description is given by driving the adjusting mechanism 3 to move under different working parameters and different preset conditions:
1. when the working parameter is a fan outlet flow velocity parameter, the control example according to a certain specific model of the centrifugal fan 100 is as follows (flow velocity v unit m/s):
when v ∈ (0, 8), the fan outlet flow velocity parameter meets a first preset condition, and at this time, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is located at the first adjusting position, that is, in the protruding direction of the volute tongue 2, the first volute tongue section 21 has a first adjusting position protruding outward relative to the two second volute tongue sections 22, and at the first adjusting position, the specific protruding amount of the protruding outward also needs to be finely adjusted;
when v ∈ (13.5, 16), the fan outlet flow speed parameter meets a second preset condition, and at this time, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is located at the second adjusting position, that is, in the protruding direction of the volute tongue 2, the first volute tongue section 21 has a second adjusting position recessed relative to the two second volute tongue sections 22, and at the second adjusting position, the specific protruding amount of the recessed interior also needs to be finely adjusted;
when v belongs to (8, 13.5), the flow speed parameter of the air outlet of the fan meets a third preset condition, and at the moment, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is located at the transition adjusting position, namely, the position between the first adjusting position and the second adjusting position;
2. when the working parameter is a static pressure parameter at an air outlet of the fan, a control example of the centrifugal fan 100 according to a specific model is as follows (static pressure Ps unit Pa):
when P is presentsE [300,430), the fan outlet flow speed parameter meets a first preset condition, at this time, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is located at the first adjusting position, that is, in the protruding direction of the volute tongue 2, the first volute tongue section 21 has a first adjusting position protruding outward relative to the two second volute tongue sections 22, and at the first adjusting position, the specific protruding amount of the protruding outward also needs to be finely adjusted;
when P is presentsWhen the current value is larger than 0,150), the flow speed parameter of the fan outlet meets a second preset condition, and at the moment, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is located at a second adjusting position, namely the second adjusting position is located in the protruding direction of the volute tongue 2The first volute tongue section 21 has a second adjusting position which is concave relative to the two second volute tongue sections 22, and the specific protruding amount of the concave part at the second adjusting position also needs to be finely adjusted;
when P is presentsE [150,300)), the flow speed parameter of the fan outlet meets a third preset condition, and at the moment, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is in the transition adjusting position, namely, the position between the first adjusting position and the second adjusting position;
3. when the operating parameter is a motor power parameter, a control example of the centrifugal fan 100 according to a specific model is as follows (power P unit W):
when P is presentsE [135,190), the fan outlet flow speed parameter meets a first preset condition, at this time, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is located at the first adjusting position, that is, in the protruding direction of the volute tongue 2, the first volute tongue section 21 has a first adjusting position protruding outward relative to the two second volute tongue sections 22, and at the first adjusting position, the specific protruding amount of the protruding outward also needs to be finely adjusted;
when P is presentsWhen the element belongs to [240,255 ], the fan outlet flow speed parameter meets a second preset condition, at this time, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is located at a second adjusting position, that is, in the protruding direction of the volute tongue 2, the first volute tongue section 21 has a second adjusting position recessed relative to the two second volute tongue sections 22, and at the second adjusting position, the specific protruding amount of the recessed portion also needs to be finely adjusted;
when P is presentsE [190,240)), the flow speed parameter of the fan outlet meets a third preset condition, and at the moment, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is in the transition adjusting position, namely, the position between the first adjusting position and the second adjusting position;
4. when the operating parameter is a wind wheel rotation speed parameter, a control example of the centrifugal fan 100 according to a specific model is as follows (rotation speed R in rms):
when R belongs to [1350,1450 ], the fan outlet flow speed parameter meets a first preset condition, and at this time, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is at the first adjusting position, that is, in the protruding direction of the volute tongue 2, the first volute tongue section 21 has a first adjusting position protruding outwards relative to the two second volute tongue sections 22, and at the first adjusting position, the specific protruding amount of the protruding outwards also needs to be finely adjusted;
when R belongs to [1100,1250 ], the fan outlet flow speed parameter meets a second preset condition, and at this time, the adjusting mechanism 3 is controlled to move, so that the first volute tongue section 21 is at the second adjusting position, that is, in the protruding direction of the volute tongue 2, the first volute tongue section 21 has a second adjusting position recessed relative to the two second volute tongue sections 22, and at the second adjusting position, the specific protruding amount of the recessed portion also needs to be finely adjusted;
when P is presentsE [1250,1350 ]), controlling the movement of the adjusting mechanism 3 so that the first volute tongue section 21 is in the transition adjusting position, namely, the position between the first adjusting position and the second adjusting position.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A centrifugal fan, comprising:
the centrifugal fan comprises a shell structure of the centrifugal fan, wherein the shell structure of the centrifugal fan comprises a volute, a volute tongue and an adjusting mechanism, the volute defines a mounting cavity for mounting a centrifugal wind wheel and an air outlet channel extending from one side of the mounting cavity, the volute tongue is arranged at the junction of the air outlet channel and the mounting cavity, extends towards the center of the air outlet channel and is arranged in a protruding mode, at least part of the volute tongue is arranged in a telescopic mode in the extending direction of the volute tongue in a telescopic mode, and the adjusting mechanism is used for correspondingly adjusting the telescopic movement of the telescopic part of the volute tongue;
the centrifugal wind wheel is rotatably arranged in the mounting cavity;
the flow velocity measuring device is used for monitoring the flow velocity parameter of the fan air outlet of the centrifugal fan; and the number of the first and second groups,
and the control device is electrically connected with the flow velocity measuring device and used for controlling the action of the adjusting mechanism according to the obtained flow velocity parameters of the air outlet of the fan.
2. The centrifugal fan as claimed in claim 1, wherein the flow velocity measuring device comprises a first anemometer having a total pressure hole for positioning relative to an air flow of the outlet of the centrifugal fan.
3. The centrifugal fan as claimed in claim 2, wherein the air outlet of the centrifugal fan is provided with a first air outlet pipe, and a rectifying grating is arranged in the first air outlet pipe and is used for dividing an inner cavity of the first air outlet pipe into a plurality of pipe flow channels arranged in parallel;
the first air speed pipe is positioned on one side, back to the air outlet of the centrifugal fan, of the rectifying grating and corresponds to one of the pipe runners.
4. The centrifugal fan of claim 3, wherein the fairing grating comprises a plurality of grating plates disposed in staggered relation to one another.
5. The centrifugal fan according to claim 1, wherein the direction in which the volute extends along the circumferential direction of the outlet duct is taken as a length direction of the volute, the volute tongue comprises a plurality of volute tongue segments connected with each other along the length direction of the volute tongue, and at least one volute tongue segment corresponds to an adjustable portion of the volute tongue.
6. The centrifugal fan of claim 5, wherein the plurality of volute tongue segments comprises a first volute tongue segment and at least two second volute tongue segments on either side of the first volute tongue segment;
the radius of curvature of the flow dividing surface of the first volute tongue section is smaller than that of the flow dividing surface of the second volute tongue section.
7. The centrifugal fan of claim 1 wherein the adjustment mechanism comprises a linear drive structure mounted to the volute, the drive end of the linear drive structure drivingly connected to the adjustable portion of the volute tongue.
8. A range hood comprising a centrifugal fan according to any one of claims 1 to 7.
9. The centrifugal fan air-out control method is characterized by comprising the following steps of:
acquiring an actual fan air outlet flow velocity parameter of the centrifugal fan;
obtaining an actual adjusting parameter according to the obtained actual fan outlet flow velocity parameter and a first mapping relation, wherein the first mapping relation is a corresponding incidence relation between the fan outlet flow velocity parameter and the adjusting parameter;
and controlling the movement of the adjusting mechanism according to the obtained actual adjusting parameters.
10. The utility model provides a centrifugal fan air-out controlling means which characterized in that includes: the control method comprises a memory, a processor and a centrifugal fan air-out control program which is stored on the memory and can run on the processor, wherein the centrifugal fan air-out control program is configured to realize the steps of the centrifugal fan air-out control method according to claim 9.
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CN114251285A (en) * 2020-09-25 2022-03-29 佛山市顺德区美的洗涤电器制造有限公司 Centrifugal fan, air outlet control method and device and range hood
CN114251287A (en) * 2020-09-25 2022-03-29 佛山市顺德区美的洗涤电器制造有限公司 Centrifugal fan, air outlet control method and device and range hood
CN114251284A (en) * 2020-09-25 2022-03-29 佛山市顺德区美的洗涤电器制造有限公司 Centrifugal fan, air outlet control method and device and range hood
CN114251287B (en) * 2020-09-25 2024-04-26 佛山市顺德区美的洗涤电器制造有限公司 Centrifugal fan, air outlet control method and device and range hood
CN114251284B (en) * 2020-09-25 2024-04-26 佛山市顺德区美的洗涤电器制造有限公司 Centrifugal fan, air outlet control method and device and range hood
CN114251285B (en) * 2020-09-25 2024-04-26 佛山市顺德区美的洗涤电器制造有限公司 Centrifugal fan, air outlet control method and device and range hood

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