CN114251288A - 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
CN114251288A
CN114251288A CN202011029857.8A CN202011029857A CN114251288A CN 114251288 A CN114251288 A CN 114251288A CN 202011029857 A CN202011029857 A CN 202011029857A CN 114251288 A CN114251288 A CN 114251288A
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CN
China
Prior art keywords
centrifugal fan
volute tongue
air outlet
push
volute
Prior art date
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Granted
Application number
CN202011029857.8A
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Chinese (zh)
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CN114251288B (en
Inventor
边乐超
张野
崔福浩
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 CN202011029857.8A priority Critical patent/CN114251288B/en
Publication of CN114251288A publication Critical patent/CN114251288A/en
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Publication of CN114251288B publication Critical patent/CN114251288B/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)

Abstract

The invention discloses a centrifugal fan, an air outlet control method, a device and a range hood, wherein the centrifugal fan comprises a shell structure of the centrifugal fan, a centrifugal wind wheel, a monitoring device and a control device, the shell structure of the centrifugal fan comprises a volute, a volute tongue and a push-pull mechanism, the volute defines an installation cavity for installing the centrifugal wind wheel and an air outlet channel extending from one side of the installation cavity, the volute tongue is arranged at the junction of the air outlet channel and the installation cavity, extends towards the center of the air outlet channel and is arranged in a protruding manner, at least part of the volute tongue can deform in the protruding direction, the push-pull mechanism is used for corresponding to the deformation of the deformable part of the push-pull volute tongue, the monitoring device is used for monitoring working parameters of the centrifugal fan, the control device is electrically connected with the monitoring device and is used for controlling the action of the push-pull mechanism according to the obtained working parameters, and the condition that airflow is not uniformly distributed in the axial direction of the volute under different working conditions is adapted, the effects of reducing noise and increasing static pressure are achieved.

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 invention provides a centrifugal fan, which can achieve the effects of reducing noise and increasing static pressure in most working conditions by adjusting the depth of the volute tongue in sections according to different working conditions, however, how to adjust the depth of the volute tongue according to different working conditions corresponding to working parameters 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 a push-pull 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 manner, at least part of the volute tongue can deform in the protruding direction of the volute tongue, so that the volute tongue can stretch and retract in the protruding direction at the corresponding deformation position, and the push-pull mechanism is used for correspondingly pushing and pulling the deformation position of the volute tongue;
the centrifugal wind wheel is rotatably arranged in the mounting cavity;
the monitoring device is used for monitoring working parameters of the centrifugal fan; and the number of the first and second groups,
and the control device is electrically connected with the monitoring device and used for controlling the action of the push-pull mechanism according to the obtained working parameters.
In an embodiment, the operating parameter includes 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.
In an embodiment, the monitoring device includes a flow rate measuring device disposed at the air outlet of the centrifugal fan, and is configured to measure a flow rate at the air outlet of the centrifugal 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 one embodiment, the volute tongue has a flow dividing surface formed at one end in a protruding direction thereof, and the flow dividing surface is arranged in a circular arc curved surface.
In an embodiment, a direction in which the volute tongue extends along the circumferential direction of the air outlet duct is taken as a length direction of the volute tongue, and along the length direction, the curvature radius of the flow dividing surface of the volute tongue gradually increases from the middle position to two sides of the flow dividing surface.
In one embodiment, the volute tongue comprises a middle volute tongue section at the middle position and side volute tongue sections respectively arranged at two sides of the middle volute tongue section, wherein,
the curvature radius of the middle volute tongue section is R1, and R1 is more than or equal to 5mm and less than or equal to 11 mm; and/or the presence of a gas in the gas,
the curvature radius of the edge volute tongue section is R2, and R2 is more than or equal to 3mm and less than or equal to 9 mm.
In one embodiment, the push-pull mechanism includes a linear drive structure mounted to the volute, the drive end of the linear drive structure drivingly connecting the deformable portion of the volute tongue.
In one embodiment, the volute tongue is provided with a mounting surface opposite to the flow dividing surface along the protruding direction of the volute tongue, the volute tongue is provided with a mounting cavity, and an opening is formed in the side of the mounting surface;
the driving end of the linear driving structure extends into the mounting cavity from the opening.
In one embodiment, the material of the volute tongue is flexible.
The invention also provides a range hood, which comprises a centrifugal fan, wherein the centrifugal fan comprises a shell structure of the centrifugal fan and a centrifugal wind wheel, the centrifugal wind wheel is rotatably arranged in the installation cavity, and the shell structure of the centrifugal fan comprises:
the volute defines a mounting cavity for mounting the 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, and at least part of the volute tongue can deform in the protruding direction of the volute tongue so that the volute tongue can stretch and retract in the corresponding deformation position along the protruding direction of the volute tongue; and the number of the first and second groups,
and the push-pull mechanism is used for correspondingly pushing and pulling the deformable part of the volute tongue to deform.
The invention also provides an air outlet control method of the centrifugal fan, which comprises the following steps:
acquiring actual working parameters of the centrifugal fan;
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 push-pull mechanism to move according to the obtained actual adjusting parameters.
In an embodiment, in a protruding direction of the volute tongue, the push-pull mechanism pushes and pulls the volute tongue so that the volute tongue has a first adjustment position in which the middle position protrudes outwards, a second adjustment position in which the middle position is concave inwards, and a transition adjustment position between the first adjustment position and the second adjustment position, and the first mapping relationship is as follows:
when the working parameters meet a first preset condition, controlling the push-pull mechanism to move so as to enable the volute tongue to be located at a first adjusting position;
when the working parameters meet a second preset condition, controlling the push-pull mechanism to move so as to enable the volute tongue to be located at a second adjusting position;
and when the working parameter meets a third preset condition, controlling the push-pull mechanism to move so as to enable the volute tongue to be in the transition adjusting position.
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 actual working parameters of the centrifugal fan;
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 push-pull mechanism to move 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 monitoring device and a control device, the volute tongue extends towards the center of the air outlet channel and is arranged in a protruding mode, at least part of the volute tongue can deform in the protruding direction, the push-pull mechanism is used for correspondingly pushing and pulling the deformable part of the volute tongue to deform, the control device monitors working parameters through the monitoring device so as to control the action of the push-pull mechanism, and through the push-pull adjustment function of the push-pull mechanism, the depth of the volute tongue at different positions can be adjusted to adapt to the condition that 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 of the length direction of the volute tongue is automatically adjusted according to working parameters, so that automatic adjustment is facilitated, and 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-shaped tongue of FIG. 1 engaged with the push-pull mechanism (at an angle);
FIG. 3 is an exploded perspective view of the volute tongue and the push-pull mechanism shown in FIG. 1;
FIG. 4 is a schematic perspective view of the worm-shaped tongue of FIG. 1 engaged with the push-pull mechanism (at another angle);
FIG. 5 is a schematic diagram of a control structure of the centrifugal fan in FIG. 1;
fig. 6 is a schematic perspective view of a range hood including the centrifugal fan in fig. 1 according to an embodiment of the present invention;
FIG. 7 is a schematic view of a partial cross-sectional structure of the range hood of FIG. 6;
fig. 8 is a schematic partial cross-sectional perspective view of the range hood of fig. 6 (with a first outlet duct at a first angle);
fig. 9 is a schematic partial cross-sectional perspective view of the range hood of fig. 6 (with a second air outlet pipe at a first angle);
fig. 10 is a schematic perspective view of the range hood of fig. 6 (at a second angle) in partial section;
fig. 11 is a schematic partial cross-sectional perspective view of the range hood of fig. 6 (third angle);
fig. 12 is an enlarged schematic view of a portion a of fig. 11.
FIG. 13 is a diagram illustrating a server architecture of a hardware operating environment according to an embodiment of the present invention;
fig. 14 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:
reference numerals Name (R) Reference numerals Name (R)
100 Centrifugal fan 2012 First static pressure hole
1 Spiral casing 202 Rectifying grid
11 Air outlet channel 203 Current sensor
2 Volute tongue 204 Reflected photoelectric measuring device
21 Safety loading cavity 2041 Laser transmitter
3 Push-pull mechanism 2042 Laser receiver
31 Linear driving structure 2043 Reflector plate
4 Centrifugal wind wheel 205 First air outlet pipe
1000 Smoke exhaust ventilator 206 Second air outlet pipe
200 Monitoring device 207 Second air velocity tube
201 First anemometer 208 Second static pressure hole
2011 Total pressure hole 300 Control device
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 5 are schematic diagrams of embodiments of the centrifugal fan provided by the present invention, and fig. 6 to 14 are schematic diagrams of embodiments of the range hood provided by the present invention.
Referring to fig. 1 to 4, a centrifugal fan 100 according to the present invention includes a housing structure of the centrifugal fan, a centrifugal wind wheel 4, a monitoring device 200, and a control device 300, where the housing structure of the centrifugal fan includes a volute 1, a volute tongue 2, and a push-pull 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 deformable in a protruding direction thereof, so that the volute tongue 2 is telescopic in the protruding direction at the corresponding deformation position, the push-pull mechanism 3 is configured to deform the deformable position for pushing and pulling the volute tongue 2, the centrifugal wind wheel 4 is rotatably mounted in the mounting cavity, the monitoring device 200 is used for monitoring the working parameters of the centrifugal fan 4, and the control device 300 is electrically connected to the monitoring device 200 and is used for controlling the action of the push-pull mechanism 3 according to the obtained working parameters.
In the technical scheme of the invention, the centrifugal fan 100 comprises a shell structure of the centrifugal fan, a centrifugal wind wheel 4, a monitoring device 200 and a control device 300, wherein the volute tongue 2 extends towards the center of the air outlet channel 11 and is arranged in a protruding manner, at least part of the volute tongue 2 can deform in the protruding direction, the push-pull mechanism 3 is used for correspondingly pushing and pulling the deformable position of the volute tongue 2 to deform, the control device 300 monitors working parameters through the monitoring device 200 to control the action of the push-pull mechanism 3, the depth of the volute tongue 2 at different positions can be adjusted through the push-pull adjustment function of the push-pull mechanism 3 so as 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, meanwhile, the depth distribution in the length direction of the volute tongue 2 is automatically adjusted according to the working parameters, the automatic adjustment is convenient to realize, and the user experience is improved.
In addition, the volute tongue 2 extends towards the center of the air outlet channel 11 and is arranged in a protruding manner, at least part of the volute tongue 2 can deform in the protruding direction, so that the volute tongue 2 stretches out and draws back in the corresponding deformation position along the protruding direction, the push-pull mechanism 3 is used for correspondingly pushing and pulling the deformation position of the volute tongue 2, and the depth of different positions of the volute tongue 2 can be adjusted through the adjustment effect of the push-pull mechanism 3, so that the condition that airflow is not uniformly distributed in the axial direction of the volute casing 1 under different working conditions is adapted, and the effects of reducing noise and increasing static pressure are achieved.
In one embodiment, the volute tongue 2 has a flow dividing surface formed at one end in the protruding direction, the flow dividing surface is arranged in a circular arc curved surface, and the flow dividing surface of the volute tongue is arranged in the curved surface, so that flow dividing is formed in the volute casing 1 conveniently, and the airflow resistance is reduced.
The distribution of the air flow speed of the volute casing 1 in the axial plane is uneven, and the state of high flow speed near the central disk and low flow speed at two sides can occur, in one embodiment, the direction in which the volute tongue 2 extends along the circumferential direction of the air outlet duct 11 is taken as the length direction of the volute tongue, and the curvature radius of the flow dividing surface of the volute tongue 2 from the middle position to two sides is gradually increased along the length direction of the volute tongue, at the moment, the volute tongue 2 correspondingly positioned in the middle is a pointed volute tongue, and the volute tongues 2 correspondingly positioned at two sides are flat volute tongues, so that the gas flow division is facilitated, and the backflow at the volute tongue 2 is reduced.
In an embodiment, referring to fig. 4, the volute tongue 2 includes a middle volute tongue section at a middle position and side volute tongue sections respectively disposed at two sides of the middle volute tongue section, a curvature radius of the middle volute tongue section is R1, R1 is greater than or equal to 5mm and less than or equal to 11mm, a curvature radius of the side volute tongue section is R2, and R2 is greater than or equal to 3mm and less than or equal to 9 mm.
The push-pull 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 to overcome the resistance of smoke discharge due to the requirement of smoke discharge, at the moment, the volute tongue protruding outwards from the middle is adopted, so that the shunting of airflow is facilitated, the backflow at the volute tongue 2 is reduced, and the static pressure is increased; 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 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 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, in a protruding direction of the volute tongue 2, the push-pull mechanism 3 pushes and pulls the volute tongue 2, so that the volute tongue 2 has a first adjustment position where a middle position protrudes outward, a second adjustment position where the middle position is recessed inward, and a transition adjustment position between the first adjustment position and the second adjustment position, when the volute tongue 2 is at the first adjustment position, the first adjustment position corresponds to a volute tongue with a middle protruding outward, which is beneficial to diversion of airflow, reduces backflow at the volute tongue 2, and improves static pressure, the second adjustment position corresponds to a position capable of reducing impact of high-speed airflow on the volute tongue 2 and reducing noise, the push-pull mechanism 3 adjusts the volute tongue 2 to switch among the first adjustment position, the transition adjustment position, and the second adjustment position to adapt to adjustment requirements under different working conditions, the first adjustment position, the second adjustment position, and the transition position are not absolute positions but are adjustment ranges, which have the effect of reducing noise and increasing static pressure.
The push-pull mechanism 3 is used for correspondingly pushing and pulling the deformable part of the volute tongue 2 to deform, the present invention does not limit the specific driving manner of the push-pull mechanism 3, in an embodiment, referring to fig. 3, the push-pull mechanism 3 includes a linear driving structure 31, the linear driving structure 31 is installed on the volute casing 1, a driving end of the linear driving structure 31 is in driving connection with the deformable part of the volute tongue 2, the deformable part of the volute tongue 2 is driven to deform by 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 one embodiment, the linear driving structure 31 is provided in plurality to deform at a plurality of positions on the volute tongue 2, so as to adapt to more complex working conditions.
In one embodiment, the volute tongue 2 has a mounting surface opposite to the flow dividing surface along a protruding direction of the volute tongue 2, the volute tongue 2 has a mounting cavity 21, an opening is formed in the side of the mounting surface, a driving end of the linear driving structure 31 extends into the mounting cavity 21 from the opening, and the volute tongue 2 is configured into a shell structure, so that the linear driving structure 31 is easy to deform correspondingly when being pushed and pulled, and automatic control is facilitated.
The volute tongue 2 needs to be easily deformed under the external action, in an embodiment, the volute tongue 2 is made of a flexible material, and meanwhile, in consideration of high-temperature resistant occasions such as the range hood 1000 and the like, the volute tongue 2 can be made of a high-temperature resistant polymer material and the like.
Referring to fig. 5 to 7, the centrifugal fan 100 provided by the present invention includes a housing structure of the centrifugal fan and the centrifugal wind wheel 4 rotatably mounted in the mounting cavity of the housing structure of the centrifugal fan, and since the centrifugal fan 100 includes all the technical features described in the embodiment of the housing structure of the centrifugal fan, the centrifugal fan has all the technical effects described in the embodiment of the housing structure of the centrifugal fan, which is not described in detail herein.
Referring to fig. 5, the push-pull 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 push-pull 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 action of the push-pull mechanism 3 according to the obtained working parameters, the action parameter 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. 8, the flow rate measuring 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 measuring 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 BDA0002700531510000101
The flow velocity of the gas flowing through the first wind speed pipe 201 can be obtained, and the measurement is accurate, it should be noted that the method of measuring the wind speed at the wind outlet of the centrifugal fan 100 by using the first wind speed pipe 201 is adopted in the prior art, and here, the method is not adoptedAs will be described in detail.
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. 9, 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 velocity 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 velocity pipe 207, so that the static pressure in the second air velocity 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. 10, 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. 11 and fig. 12, 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. 13, fig. 13 is a schematic structural diagram of the air outlet control device of the centrifugal fan of the present invention.
As shown in fig. 13, the centrifugal fan outlet air 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.
It will be appreciated by those skilled in the art that the configuration shown in fig. 13 does not constitute a limitation of the centrifugal fan wind control device, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
As shown in fig. 13, 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. 13, 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 push-pull mechanism 3 to move according to the obtained actual adjusting parameters.
Based on the above hardware structure, fig. 14 is an embodiment of the method for controlling air outlet of the centrifugal fan according to the present invention.
Referring to fig. 14, 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 push-pull mechanism 3 according to the obtained actual adjusting parameters;
it should be noted that after the actual adjustment parameters are obtained, the push-pull mechanism 3 can be directly driven to move, for example, the push-pull 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 outwards 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 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 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 push-pull mechanism 3 is controlled according to the obtained actual adjusting parameters, so that the push-pull mechanism 3 is automatically driven according to the working state of the centrifugal fan 100 to adjust the movement of the volute tongue 2, so as to adapt to the condition that airflow is not uniformly distributed in the axial direction of the volute 1 under different working conditions, and the effects of reducing noise and increasing static pressure are achieved.
In one embodiment, in the protruding direction of the volute tongue 2, the push-pull mechanism 3 pushes and pulls the volute tongue 2, so that the volute tongue 2 has a first adjustment position with a middle position protruding outwards, a second adjustment position with a middle position recessed inwards, and a transition adjustment position between the first adjustment position and the second adjustment position, and the first mapping relationship is as follows:
when the working parameters meet a first preset condition, controlling the push-pull mechanism 3 to move so as to enable the volute tongue 2 to be in the first adjusting position;
when the working parameters meet a second preset condition, controlling the push-pull mechanism 3 to move so as to enable the volute tongue 2 to be in the second adjusting position;
and when the working parameters meet a third preset condition, controlling the push-pull mechanism 3 to move so as to enable the volute tongue 2 to be in the transition adjusting position.
In the embodiment of the present invention, different preset conditions are set, so as to control the movement of the push-pull mechanism 3 more accurately, and the present invention can be more suitable for the situation that 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 push-pull mechanism 3 to move under different preset conditions according to different working parameters:
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 flow velocity parameter of the fan outlet meets a first preset condition, and at this time, the push-pull mechanism 3 is controlled to move, so that the volute tongue 2 is located at the first adjustment position, that is, in the protruding direction of the volute tongue 2, the volute tongue 2 has a first adjustment position protruding outward relative to the two second volute tongue sections 22, and at the first adjustment position, the specific protruding amount of the protruding outward also needs to be finely adjusted;
when v is (13.5, 16), the flow speed parameter of the fan outlet meets a second preset condition, and at this time, the push-pull mechanism 3 is controlled to move, so that the volute tongue 2 is located at a second adjustment position, that is, in the protruding direction of the volute tongue 2, the volute tongue 2 has a second adjustment position recessed relative to the two second volute tongue sections 22, and at the second adjustment 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 push-pull mechanism 3 is controlled to move, so that the volute tongue 2 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 flow speed parameter of the fan outlet meets a first preset condition, and at this time, the push-pull mechanism 3 is controlled to move, so that the volute tongue 2 is located at the first adjusting position, that is, in the protruding direction of the volute tongue 2, the volute tongue 2 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 P is presentsWhen the flow rate parameter of the fan outlet meets a second preset condition, controlling the push-pull mechanism 3 to move so that the volute tongue 2 is at a second adjusting position, namely, in the protruding direction of the volute tongue 2, the volute tongue 2 has a second adjusting position which is concave relative to the two second volute tongue sections 22, and at the second adjusting position, the specific concave protruding amount also needs to be finely adjusted;
when P is presentsWhen the flow rate parameter belongs to [150,300 ], the flow rate parameter of the air outlet of the fan meets a third preset condition, and at the moment, the push-pull mechanism 3 is controlled to move, so that the volute tongue 2 is located at 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 flow speed parameter of the fan outlet meets a first preset condition, and at this time, the push-pull mechanism 3 is controlled to move, so that the volute tongue 2 is located at the first adjusting position, that is, in the protruding direction of the volute tongue 2, the volute tongue 2 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 P is presentsWhen the flow rate parameter of the fan outlet meets a second preset condition, controlling the push-pull mechanism 3 to move so that the volute tongue 2 is at a second adjusting position, namely, in the protruding direction of the volute tongue 2, the volute tongue 2 has a second adjusting position which is concave relative to the two second volute tongue sections 22, and at the second adjusting position, the specific concave protruding amount also needs to be finely adjusted;
when P is presentsWhen the flow rate parameter belongs to [190,240 ], the flow rate parameter of the air outlet of the fan meets a third preset condition, and at the moment, the push-pull mechanism 3 is controlled to move, so that the volute tongue 2 is located at 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 velocity parameter meets a first preset condition, and at this time, the push-pull mechanism 3 is controlled to move, so that the volute tongue 2 is located at the first adjustment position, that is, in the protruding direction of the volute tongue 2, the volute tongue 2 has a first adjustment position protruding outwards relative to the two second volute tongue sections 22, and at the first adjustment 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 velocity parameter meets a second preset condition, and at this time, the push-pull mechanism 3 is controlled to move, so that the volute tongue 2 is located at a second adjustment position, that is, in the protruding direction of the volute tongue 2, the volute tongue 2 has a second adjustment position recessed relative to the two second volute tongue sections 22, and at the second adjustment position, the specific protruding amount of the recessed part also needs to be finely adjusted;
when P is presentsE [1250,1350 ]), controlling the push-pull mechanism 3 to move so that the volute tongue 2 is in the transition adjustment position, namely the position between the first adjustment position and the second adjustment 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 (16)

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 a push-pull 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 manner, at least part of the volute tongue can deform in the protruding direction of the volute tongue, so that the volute tongue can stretch and retract in the protruding direction at the corresponding deformation position, and the push-pull mechanism is used for correspondingly pushing and pulling the deformation position of the volute tongue;
the centrifugal wind wheel is rotatably arranged in the mounting cavity;
the monitoring device is used for monitoring working parameters of the centrifugal fan; and the number of the first and second groups,
and the control device is electrically connected with the monitoring device and used for controlling the action of the push-pull mechanism according to the obtained working parameters.
2. The centrifugal fan of claim 1, wherein the operating parameter comprises at least one of a fan outlet flow rate parameter, a fan outlet static pressure parameter, a motor power parameter, and a rotor speed parameter.
3. The centrifugal fan as claimed in claim 1, wherein the monitoring device comprises a flow rate measuring device disposed at the air outlet of the centrifugal fan for measuring the flow rate at the air outlet of the centrifugal fan.
4. The centrifugal fan as claimed in claim 3, wherein the flow velocity measuring device comprises a first anemometer having a total pressure hole for being disposed opposite to an air flow of the outlet of the centrifugal fan.
5. The centrifugal fan as claimed in claim 4, wherein an air outlet of the centrifugal fan is provided with a first air outlet pipe, a rectifying grating is arranged in the first air outlet pipe, and the rectifying grating 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.
6. The centrifugal fan of claim 5, wherein the fairing grating comprises a plurality of grating plates disposed in staggered relation to one another.
7. The centrifugal fan according to claim 1, wherein the volute tongue has a diverging surface formed at one end thereof in a protruding direction, the diverging surface being disposed in a curved surface.
8. The centrifugal fan according to claim 7, wherein a direction in which the volute tongue extends in the circumferential direction of the outlet duct is defined as a longitudinal direction thereof, and a radius of curvature of the flow dividing surface of the volute tongue gradually increases from a middle position thereof to both sides thereof in the longitudinal direction.
9. The centrifugal fan as claimed in claim 8, wherein the volute tongue comprises a middle volute tongue section at a middle position and side volute tongue sections respectively disposed at both sides of the middle volute tongue section, wherein,
the curvature radius of the middle volute tongue section is R1, and R1 is more than or equal to 5mm and less than or equal to 11 mm; and/or the presence of a gas in the gas,
the curvature radius of the edge volute tongue section is R2, and R2 is more than or equal to 3mm and less than or equal to 9 mm.
10. The centrifugal fan of claim 1 wherein the push-pull mechanism includes a linear drive structure mounted to the volute, the drive end of the linear drive structure drivingly engaging the deformable portion of the volute tongue.
11. The centrifugal fan according to claim 10, wherein the volute tongue has a mounting surface opposite to the flow dividing surface in a protruding direction of the volute tongue, the volute tongue has a mounting cavity, and an opening is provided on the mounting surface side;
the driving end of the linear driving structure extends into the mounting cavity from the opening.
12. The centrifugal fan of claim 1, wherein the volute tongue is made of a flexible material.
13. A range hood comprising a centrifugal fan according to any one of claims 1 to 12.
14. The centrifugal fan air-out control method is characterized by comprising the following steps of:
acquiring actual working parameters of the centrifugal fan;
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 push-pull mechanism to move according to the obtained actual adjusting parameters.
15. The centrifugal fan outlet air control method according to claim 14, wherein the push-pull mechanism pushes and pulls the volute tongue in a protruding direction of the volute tongue, so that the volute tongue has a first adjustment position with an outward protruding middle position, a second adjustment position with an inward recessed middle position, and a transition adjustment position between the first adjustment position and the second adjustment position, and the first mapping relationship is:
when the working parameters meet a first preset condition, controlling the push-pull mechanism to move so as to enable the volute tongue to be located at a first adjusting position;
when the working parameters meet a second preset condition, controlling the push-pull mechanism to move so as to enable the volute tongue to be located at a second adjusting position;
and when the working parameter meets a third preset condition, controlling the push-pull mechanism to move so as to enable the volute tongue to be in the transition adjusting position.
16. 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 any one of claims 14 to 15.
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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
CN114251283A (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

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