CN114251281A - Centrifugal fan and range hood - Google Patents

Centrifugal fan and range hood Download PDF

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Publication number
CN114251281A
CN114251281A CN202011023118.8A CN202011023118A CN114251281A CN 114251281 A CN114251281 A CN 114251281A CN 202011023118 A CN202011023118 A CN 202011023118A CN 114251281 A CN114251281 A CN 114251281A
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CN
China
Prior art keywords
centrifugal fan
extension
adjustable
air
volute
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202011023118.8A
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Chinese (zh)
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CN114251281B (en
Inventor
边乐超
何福添
崔福浩
张野
李伟
刘华春
汪耀东
李忠华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Original Assignee
Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
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Publication date
Application filed by Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd filed Critical Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority to CN202011023118.8A priority Critical patent/CN114251281B/en
Priority to PCT/CN2020/124065 priority patent/WO2022062043A1/en
Publication of CN114251281A publication Critical patent/CN114251281A/en
Application granted granted Critical
Publication of CN114251281B publication Critical patent/CN114251281B/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
    • 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
    • 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
    • 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
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • 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
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a centrifugal fan and a range hood, wherein the centrifugal fan comprises a volute, a centrifugal wind wheel, a wind guide ring and an adjusting mechanism, the centrifugal wind wheel is arranged in the volute, the wind guide ring is arranged at an air inlet of the volute, the wind guide ring comprises an annular extending part extending into the volute, at least part of the annular extending part is provided with an adjustable extending section, the width of the adjustable extending section is adjustable along the air inlet direction, so that the extending depth of the wind guide ring is adjustable, the adjusting mechanism is used for changing the width of the adjustable extending section at the adjustable width, further the extending depth of the wind guide ring into the volute can be adjusted according to different working conditions, and the air supply requirements under different working conditions are met.

Description

Centrifugal fan and range hood
Technical Field
The invention relates to the technical field of range hoods, in particular to a centrifugal fan and a range hood.
Background
In some application scenarios, the centrifugal fan needs to supply air into a specific environment with unstable air pressure, and if the centrifugal fan is applied to the field of range hoods, the centrifugal fan needs to supply sucked air flow into a common flue with unstable air pressure, but when the air pressure (i.e. back pressure) in the specific environment is too high, return air/backflow can be generated.
In order to solve the above problems, in the related art, the air guide ring is arranged at the air inlet of the volute of the centrifugal fan, so that on one hand, the negative influence of backflow on the air suction effect of the centrifugal fan (such as the negative influence of the backflow on the smoke suction effect of the range hood) can be reduced, and on the other hand, the air at the air inlet can be guided to flow into the volute to realize flow guide.
However, continued research shows that the air guide ring usually adopts a design form with uniform longitudinal section, and the depths of the air guide ring inserted into the air inlet of the centrifugal fan are uniform, so that the air guide ring cannot adapt to different air supply working conditions.
Disclosure of Invention
In view of this, the invention provides a centrifugal fan, which can adjust the depth of a wind guide ring according to different working conditions so as to improve the adaptability of the centrifugal fan to different air supply working conditions.
In order to achieve the above object, the present invention provides a centrifugal fan comprising:
a volute;
the centrifugal wind wheel is arranged in the volute;
the air guide ring is arranged at an air inlet of the volute and comprises an annular extension part extending into the volute, at least part of the annular extension part is provided with an adjustable extension section, and the width of the adjustable extension section is adjustable along the air inlet direction, so that the extending depth of the air guide ring is adjustable; and the number of the first and second groups,
and the adjusting mechanism is used for changing the width of the adjustable part of the width of the adjustable extension section.
In one embodiment, the adjustable extension section is provided in plurality.
In one embodiment, the plurality of adjustable extension segments extend into the volute at different depths, so that the inner edge of the annular extension is at least partially stepped.
In one embodiment, a plurality of the adjustable extensions collectively form an adjustable extension group having a ratio of greater than or equal to 1/4 of an inner edge of the annular extension.
In one embodiment, the number of the adjustable extension segments is greater than or equal to 2 and less than or equal to 12.
In one embodiment, the adjustable extension is disposed adjacent to an air outlet of the centrifugal fan.
In one embodiment, a section which passes through the center line of the air outlet of the centrifugal fan and is parallel to the center line of the centrifugal wind wheel of the centrifugal fan is defined as a mounting reference surface;
the midpoint of the adjustable extension is located at the mounting reference plane.
In one embodiment, the adjustable extension section comprises a fixed extension section and a movable extension section which are at least partially arranged in an overlapping manner, and the movable extension section can move relative to the fixed extension section.
In an embodiment, the adjusting mechanism includes a linear driving structure, a fixed end of the linear driving structure is disposed on the fixed extension section, and a movable end of the linear driving structure is connected to the movable extension section in a driving manner.
In one embodiment, the adjustable extension section is provided in plurality;
the corresponding linear driving structures are arranged in plurality.
In one embodiment, the linear driving structure is one of an air cylinder, an oil cylinder or an electric push rod.
In one embodiment, the movable extension has a first adjustment position in which its outer edge abuts the inner edge of the fixed extension, a second adjustment position in which its inner edge is retracted relative to the inner edge of the fixed extension, and a transitional adjustment position between the first and second adjustment positions in the direction of the incoming air.
In an embodiment, the air guide ring further comprises an annular guide portion, the annular guide portion is arranged on the outer edge of the annular extension portion, and the annular guide portion is at least partially arranged in a necking mode in the air inlet direction.
In one embodiment, the longitudinal section of the annular guide part is two arc line segments; alternatively, the first and second electrodes may be,
the longitudinal section of the annular guide part is two oblique line segments.
In an embodiment, the wind guiding ring further includes a mounting portion, the mounting portion is disposed at an outer edge of the annular guiding portion, and the mounting portion is configured to be mounted on the volute.
The invention also provides a range hood, which comprises a centrifugal fan, wherein the centrifugal fan comprises:
a volute;
the centrifugal wind wheel is arranged in the volute;
the air guide ring is arranged at an air inlet of the volute and comprises an annular extension part extending into the volute, at least part of the annular extension part is provided with an adjustable extension section, and the width of the adjustable extension section is adjustable along the air inlet direction, so that the extending depth of the air guide ring is adjustable; and the number of the first and second groups,
and the adjusting mechanism is used for changing the width of the adjustable part of the width of the adjustable extension section.
According to the technical scheme, the air guide ring is mounted at the air inlet of the volute and comprises an annular extending portion extending into the volute, at least part of the annular extending portion is provided with an adjustable extending section, the width of the adjustable extending section is adjustable, the extending depth of the adjustable extending section is adjustable through the adjusting action of the adjusting mechanism, the extending depth of the air guide ring into the volute can be adjusted according to different working conditions, and air supply requirements under different working conditions are met.
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 wind-guiding ring (at a first angle) in FIG. 1;
FIG. 3 is a schematic perspective view of the wind-guiding ring (at a second angle) in FIG. 1;
FIG. 4 is a schematic cross-sectional view of the wind-guiding ring in FIG. 1;
FIG. 5 is an enlarged view of detail A of FIG. 4;
FIG. 6 is a schematic perspective view of the wind-guiding ring (third angle) in FIG. 1;
FIG. 7 is a schematic diagram of a control structure of the centrifugal fan of FIG. 1;
fig. 8 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. 9 is a schematic partial sectional structural view of the range hood in fig. 8;
fig. 10 is a schematic partial cross-sectional perspective view of the range hood of fig. 8 (with a first outlet duct at a first angle);
fig. 11 is a schematic partial cross-sectional perspective view of the range hood of fig. 8 (with a second air outlet pipe at a first angle);
fig. 12 is a schematic partial cross-sectional perspective view of the range hood of fig. 8 (at a second angle);
fig. 13 is a schematic partial cross-sectional perspective view of the range hood of fig. 8 (third angle);
FIG. 14 is an enlarged schematic view of detail B of FIG. 13;
FIG. 15 is a diagram illustrating a server architecture of a hardware operating environment according to an embodiment of the present invention;
fig. 16 is a flow chart illustrating an embodiment of a method for controlling air supply of a centrifugal fan according to the present invention.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
100 Centrifugal fan 201 First anemometer
1 Spiral casing 2011 Total pressure hole
11 Air outlet 2012 First static pressure hole
12 Air inlet 202 Rectifying grid
2 Wind-guiding ring 203 Current sensor
21 Adjustable extension segment 204 Reflected photoelectric measuring device
211 Fixed extension segment 2041 Laser transmitter
212 Movable extension section 2042 Laser receiver
22 Annular guide part 2043 Reflector plate
23 Mounting part 205 First air outlet pipe
3 Adjusting mechanism 206 Second air outlet pipe
31 Linear driving structure 207 Second air velocity tube
4 Centrifugal wind wheel 208 Second static pressure hole
1000 Smoke exhaust ventilator 300 Control device
200 Monitoring 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.
In some application scenarios, the centrifugal fan needs to send air into a specific environment with unstable air pressure, if the centrifugal fan is applied to the field of the range hood, the centrifugal fan needs to send sucked air flow into a common flue with unstable air pressure, but when the air pressure (i.e. back pressure) in the specific environment is too high, return air/backflow is generated, aiming at the above problems, in the related art, an air guide ring is arranged at an air inlet of a volute of the centrifugal fan, so that on one hand, the negative influence of backflow on the air suction effect of the centrifugal fan (such as the negative influence of backflow on the smoke suction effect of the range hood) can be reduced, on the other hand, the gas at the air inlet can be guided into the volute to realize flow guide, however, continuous research finds that the air guide ring usually adopts a design form with uniform longitudinal section, and the depths of the air guide ring inserted into the air inlet of the centrifugal fan are uniform, this cannot accommodate different air supply conditions.
In view of this, the present invention provides a range hood, which includes a centrifugal fan, and as long as the range hood includes the centrifugal fan of the present invention, the present invention is within the protection scope of the present invention, wherein fig. 1 to 7 are schematic diagrams of an embodiment of the centrifugal fan provided by the present invention, and fig. 8 to 16 are schematic diagrams of an embodiment of the range hood provided by the present invention.
Referring to fig. 1 to 3, the centrifugal fan 100 includes a volute 1, a centrifugal wind wheel 4, a wind guiding ring 2 and an adjusting mechanism 3, the centrifugal wind wheel 4 is disposed in the volute 1, the wind guiding ring 2 is mounted at an air inlet 12 of the volute 1, the wind guiding ring 2 includes an annular extension portion extending into the volute 1, at least a part of the annular extension portion is provided as an adjustable extension section 21, a width of the adjustable extension section 21 is adjustable along an air inlet direction, so that a depth of the wind guiding ring 2 extending into the volute is adjustable, and the adjusting mechanism 3 is configured to change a width of a position where the width of the adjustable extension section 21 is adjustable.
In the technical scheme of the invention, the air guide ring 2 is arranged at the air inlet 12 of the volute 1, the air guide ring 2 comprises an annular extension part extending into the volute 1, at least part of the annular extension part is provided with an adjustable extension section 21, the width of the adjustable extension section 21 is adjustable, the extending depth of the adjustable extension section 21 is adjustable through the adjusting action of the adjusting mechanism 3, and then the extending depth of the air guide ring 2 into the volute 1 can be adjusted according to different working conditions, so that the air supply requirements under different working conditions are met.
It should be noted that the width of the adjustable extension segment 21 is adjustable, the adjustable extension segment 21 may be configured to be foldable, and the width is adjustable by continuously opening two mutually folded portions, or the adjustable extension segment 21 may be configured to be flexible, and the width is adjustable by deformation of the adjustable extension segment 21, in an embodiment, referring to fig. 2 to 5, the adjustable extension segment 21 includes a fixed extension segment 211 and a movable extension segment 212 that are at least partially overlapped, the movable extension segment 212 is movable relative to the fixed extension segment 211, and the depth that the adjustable extension segment 21 extends is adjusted by adjusting the overlap ratio between the fixed extension segment 211 and the adjustable extension segment 21, so that the adjustment is more convenient.
In an embodiment of the present invention, as shown in fig. 1, the centrifugal fan 100 includes a volute 1, a centrifugal wind wheel 4 and a wind guiding ring 2, the centrifugal wind wheel 4 is disposed in the volute 1, the wind guiding ring 2 is mounted at an air inlet 12 of the volute 1, specifically, the volute 1 has an air inlet 12, an air outlet 11 and a centrifugal air duct disposed between the air inlet 12 and the air outlet 11, and the centrifugal wind wheel 4 is disposed in the centrifugal air duct.
In an embodiment, referring to fig. 2, the wind guiding ring 2 further includes an annular guiding portion 22, the annular guiding portion 22 is disposed at an outer edge of the annular extending portion, and the annular guiding portion 22 is at least partially disposed in a necking shape in the wind inlet direction, so as to guide the airflow into the volute casing 1.
In an embodiment, the wind guiding ring 2 further includes an installation portion 23, the installation portion 23 is disposed at an outer edge of the annular guiding portion 22, and the installation portion 23 is configured to be installed on the spiral casing 1, specifically, on a side wall of the spiral casing 1, so that the wind guiding ring 2 is fixed.
In a specific embodiment, the mounting portion 23 may be configured in a ring shape, that is, the mounting portion 23 is a mounting ring disposed on the outer edge of the annular guiding portion 22; a plurality of mounting convex portions may be provided, for example, the mounting portion 23 is a plurality of mounting lugs which are convexly provided on the outer edge of the annular guide portion 22 and are distributed at intervals along the circumferential direction of the annular guide portion 22; and the like, as long as the air guide ring 2 can be fixedly installed at the air inlet 12 of the volute 1.
In this embodiment, the mounting portion 23 is a mounting ring, so as to facilitate the sealing mounting of the wind guiding ring 2 and the volute 1. Specifically, the side surface of the mounting ring is attached to the outer surface of the side wall of the volute 1.
It can be understood that the inner edge of the wind guiding ring 2 extends into the volute 1, and the cross section of the annular guiding portion 22 of the wind guiding ring 2 is continuously and gradually changed in the wind inlet direction, specifically, the longitudinal section of the annular guiding portion is two arc line segments, or two oblique line segments, so as to better balance the relationship between the high static pressure resistance of the wind guiding ring 2 and the improvement of the wind inlet amount.
It can be understood that, the more the inner edge of the annular extension is protruded in the air intake direction, the wider the axial width of the annular extension (i.e. the width in the air intake direction), the deeper the depth of the annular extension extending into the scroll casing 1, the stronger the blocking effect of the annular extension on the backflow gas, but the stronger the blocking effect of the annular extension on the airflow entering the scroll casing 1 through the air intake 12, which is not beneficial to increase the air intake amount. On the contrary, the narrower the axial width (i.e. the width in the air inlet direction) of the annular extension portion is, the shallower the depth of the annular extension portion extending into the volute casing 1 is, the weaker the blocking effect of the annular extension portion on the backflow gas is, but the weaker the blocking effect of the annular extension portion on the airflow entering the volute casing 1 through the air inlet 12 is, which is beneficial to improving the air inlet amount.
In the technical scheme of the invention, the depth of the annular extension part partially or completely extending into the volute 1 is adjusted according to different working conditions, so that the requirement of different working conditions can be correspondingly met, for example, in the air guide ring 2, the depth of the air guide ring 2 extending into the volute 1 is adjusted by adjusting the contact ratio between the fixed extension section 211 and the movable extension section 212, specifically, when the depth of the air guide ring 2 partially extending into the volute 1 is deeper, a better backflow preventing effect is achieved, so that the efficiency of a fan system can be improved, and the maximum standard static pressure of the fan system is increased; when the part of the wind guide ring 2 extends into the volute 1 to a shallow depth, the wind suction effect is better, and therefore the air inlet volume can be increased. That is to say, in this way, the air guide ring 2 can have better back pressure resistance to weaken the backflow phenomenon, and the air guide ring 2 can have larger air inlet volume to ensure the air supply effect of the centrifugal fan 100; and further, the adaptability of the centrifugal fan 100 to an air supply environment with unstable air pressure can be improved.
It can be understood that when the wind pressure in the air supply environment (such as the common flue of the range hood, which is described below as an example) of the centrifugal fan 100 is low (i.e. the centrifugal fan 100 is in a low back pressure condition) and does not generate backflow or the backflow phenomenon is weak, the airflow entering the scroll casing 1 from the air inlet 12 flows toward the air outlet 11, then the airflow at the edge of the air inlet 12 adjacent to the air outlet 11 is larger and the flow rate is faster, and the airflow at the edge of the air inlet 12 away from the air outlet 11 is smaller and the flow rate is slower.
When the air pressure in the air supply environment (such as the public flue of the range hood) of the centrifugal fan 100 is high (i.e. the centrifugal fan 100 is in a high back pressure condition) and backflow is generated, the backflow airflow firstly enters the volute 1 through the air outlet 11, then, the backflow phenomenon at the edge of the air outlet 11 adjacent to the air inlet 12 is more common or serious, and the backflow phenomenon at the edge of the air inlet 12 far away from the air outlet 11 is less common or slight.
In an embodiment, the adjustable extension section 21 is disposed adjacent to the air outlet 11 of the centrifugal fan 100, so as to adjust a region having a larger influence on the air flow in a targeted manner, so as to quickly adjust the structure of the air guide ring 2 according to different working conditions, so as to improve the adaptability of the centrifugal fan 100 to different air supply working conditions.
In one embodiment, a section passing through the center line of the air outlet 11 of the centrifugal fan 100 and parallel to the center line of the centrifugal wind wheel 4 of the centrifugal fan 100 is defined as a mounting reference surface, and the middle point of the adjustable extension section 21 is located on the mounting reference surface, so that the high static pressure resistance can be improved more remarkably, and the air intake can be improved more greatly.
Therefore, when the wind pressure in the common flue is higher (i.e. when high back pressure is applied), the movable extension section 212 of the adjustable extension section 21 extends to the depth in the volute 1 is deeper, so that, on the one hand, the backflow phenomenon at the air inlet 12 (i.e. the backflow air can be blocked, so that the backflow phenomenon can be formed only by bypassing a longer path) is weakened, the back pressure resistance and the high static pressure resistance of the centrifugal fan 100 and the range hood 1000 are improved, and the maximum (standard) static pressure of the air supply system is improved.
When the wind pressure in the common flue is low (i.e. low back pressure), the depth of the movable extension section 212 of the adjustable extension section 21 extending into the scroll casing 1 is shallow, so that the blockage of the wind guide ring 2 at the edge of the wind inlet 12 adjacent to the wind outlet 11 can be reduced, and the wind intake amount can be further increased.
In adjusting the adjustable extension 21, in an embodiment, in the air intake direction, the movable extension 212 has a first adjustment position where its outer edge is adjacent to the inner edge of the fixed extension 211, a second adjustment position where its inner edge is retracted relative to the inner edge of the fixed extension 211, and a transition adjustment position between the first adjustment position and the second adjustment position, it can be understood that the fixed extension 211 and the movable extension 212 are arranged in an overlapping manner along the radial direction of the centrifugal rotor 4, and the adjustment range is the width of the movable extension 212.
In order to be able to more fully adapt to different working conditions, the area of the annular extension occupied by the adjustable extension section 21 and the number of the adjustable extension sections 21 are all factors to be considered, in an embodiment, the adjustable extension sections 21 are provided in plurality, so that in the circumferential direction of the air inlet 12 of the centrifugal fan 100, the extending depth of the adjustable extension sections 21 is respectively adjusted correspondingly, and more different adjustment combinations can be formed to adapt to more complex working conditions.
Further, in an embodiment, referring to fig. 6, the number of the adjustable extension segments 21 is greater than or equal to 2 and less than or equal to 12, so that the number of the adjustable extension segments 21 is reasonably arranged, on one hand, the structure of the annular extension segment can be simplified, and on the other hand, the air supply requirements of different working conditions can be well adapted.
When the adjustable extension segments 21 are adjusted, in an embodiment, the depths of the plurality of adjustable extension segments 21 extending into the volute casing 1 are different, so that at least part of the inner edge of the annular extension portion is arranged in a step shape, the maximum position of the backflow influence is at a position adjacent to the air outlet 11, at this time, the deepest extending depth at the reference surface is the deepest, the extending depths at two sides of the reference surface are decreased progressively to form the step shape, and the step shape is favorable for adapting to different working conditions.
Further, a plurality of the adjustable extension segments 21 together form a group of adjustable extension segments 21, and the ratio of the group of adjustable extension segments 21 to the inner edge of the annular extension is greater than or equal to 1/4 and less than or equal to 3/4, so that the ratio of the group of adjustable extension segments 21 can be designed according to different structures of the centrifugal fan 100.
As in the present embodiment, the ratio of the group of adjustable extension segments 21 to the inner edge of the annular extension is 1/2, so as to simplify the structure of the wind-guiding ring 2 and make the wind-guiding ring 2 have better performance.
The adjusting mechanism 3 is used to correspondingly drive the movable extending section 212 to move, and the present invention does not limit the specific driving manner of the adjusting mechanism 3, and in an embodiment, referring to fig. 3, the adjusting mechanism 3 includes a linear driving structure 31, a fixed end of the linear driving structure 31 is disposed on the fixed extending section 211, a movable end of the linear driving structure 31 is connected to the movable extending section 212 in a driving manner, and the movable extending section 212 is driven to move by the linear driving structure 31, so that 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, there are a plurality of adjustable extension segments 21 and a plurality of corresponding linear driving structures 31 to adapt to more complicated working conditions.
Referring to fig. 7 and 9, in the present invention, the adjusting mechanism 3 of the centrifugal fan 100 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 extending depth of the adjustable extension section 21 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 centrifugal fan, in an embodiment, the monitoring device 200 includes a flow rate measuring device disposed at the air outlet 11 of the centrifugal fan 100, and is configured to measure the flow rate at the air outlet 11 of the centrifugal fan 100, so that the flow rate at the air outlet 11 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. 10, the flow velocity measuring device includes a first air velocity pipe 201, a total pressure hole 2011 of the first air velocity pipe 201 is configured to be disposed opposite to an air flow of the air outlet 11 of the centrifugal fan 100, a total pressure Pt of a gas on the speed measuring pipe 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 BDA0002701080550000101
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 11 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 11 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 air flow state on the whole centrifugal air duct, in an embodiment, the air outlet 11 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 11 of the centrifugal fan 100, and is arranged corresponding to one of the pipe flow channels, and the air flow is uniformly distributed in each pipe flow channel by the rectification function of the rectification grid 202, and the air flow speed of the local air flow measured by the first air speed pipe 201 can reflect the whole air flow speed condition on the centrifugal air 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 11 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, referring to fig. 11, the static pressure measuring device includes a second air outlet pipe 206 disposed at the air outlet 11 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 may be conveniently obtained, and the static pressure parameter at the air outlet of the fan may 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 velocity on the centrifugal air 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 200 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. 12, the power monitoring device 200 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 the 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 200 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.
In an embodiment, referring to fig. 13 and 14, the rotational speed monitoring device 200 includes a reflected photoelectric measuring device 204, the reflected photoelectric measuring device 204 includes a laser emitter 2041, a laser receiver 2042, and a reflector plate 2043, the laser emitter 2041 is disposed on the volute 1, the laser receiver 2042 is disposed on the volute 1, and the reflector plate 2043 is disposed on the wind wheel blade, wherein the laser emitter 2041 emits light, which is reflected by the reflector plate and received by the laser receiver 2042, and thus the rotational speed of the centrifugal wind wheel 4 can be accurately obtained.
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. 15, fig. 15 is a schematic structural diagram of a centrifugal fan blowing control device 300 according to the present invention.
As shown in fig. 15, the centrifugal fan blowing control device 300 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. 15 does not constitute a limitation of the centrifugal fan blow control device 300, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in fig. 15, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a centrifugal fan blowing control program.
In the server shown in fig. 15, 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 up, through the processor 1001, a centrifugal fan blowing control program stored in the memory 1005, and performs 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. 16 is an embodiment of the air supply control method of the centrifugal fan provided by the present invention.
Referring to fig. 16, in the present embodiment, the method for controlling air supply 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 that the adjustable extension section 21 extends into according to different working conditions, for example, when the wind pressure in the common flue is high (i.e. when high back pressure is applied), the depth that the movable extension section 212 of the adjustable extension section 21 extends into the volute 1 is deep, so on one hand, the backflow phenomenon at the air inlet 12 is weakened (i.e. backflow airflow can be blocked, so that the backflow phenomenon can be formed only by bypassing a longer path), the back pressure resistance and the high static pressure resistance of the centrifugal fan 100 and the range hood 1000 are improved, and the maximum (standard) static pressure of the air supply system is improved; when the wind pressure in the common flue is low (i.e. low back pressure), the depth of the movable extension section 212 of the adjustable extension section 21 extending into the scroll casing 1 is shallow, so that the blockage of the wind guide ring 22 at the edge of the wind inlet 12 adjacent to the wind outlet 11 can be reduced, and the wind intake amount can be further increased.
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 movement of the adjustable extension section 21 is adjusted by automatically driving the adjusting mechanism 3 according to the working state of the centrifugal fan 100, and the air supply under different working conditions is adapted.
In one embodiment, in the air intake direction, the movable extension 212 has a first adjustment position where its outer edge is adjacent to the inner edge of the fixed extension 211, a second adjustment position where its inner edge is retracted relative to the inner edge of the fixed extension 211, and a transition adjustment position between the first adjustment position and the second adjustment 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 adjustable extension 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 adjustable extension 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 adjustable extension section 21 is in the transition adjusting position.
In the embodiment of the present invention, the movement of the adjusting mechanism 3 is more accurately controlled by setting different preset conditions, and the present invention is more suitable for different working conditions, and it should be noted that the first adjusting position, the second adjusting position, and the transition position are not absolute positions, but are an adjusting range.
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, 5), the flow speed parameter of the fan outlet meets a first preset condition, and at this time, the adjusting mechanism 3 is controlled to move, so that the adjustable extension section 21 is located at the first adjusting position, that is, the movable extension section 212 has an outer edge adjacent to an inner edge of the fixed extension section 211, and at the first adjusting position, the specific moving stroke of the movable extension section 212 also needs to be finely adjusted;
when v is equal to (13.5, 16), the flow speed parameter of the air outlet of the fan meets a second preset condition, and at this time, the adjusting mechanism 3 is controlled to move, so that the adjustable extending section 21 is located at a second adjusting position, that is, the inner edge of the movable extending section 212 retracts relative to the inner edge of the fixed extending section 211, and at the second adjusting position, the specific retraction amount also needs to be finely adjusted;
when v belongs to (5, 8), 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 adjustable extension section 21 is located at the transition adjusting position, namely, the position between the first adjusting position and the second adjusting position;
when v belongs to (8, 13.5), the flow velocity parameter of the air outlet of the fan meets a third preset condition, at this time, the adjusting mechanism 3 is controlled to move, so that the adjustable extension section 21 is located at the transition adjusting position, namely, the position between the first adjusting position and the second adjusting position, it should be noted that when the flow velocity parameter of the air outlet of the fan meets the third preset condition, the more the value of the velocity v is close to the first preset condition, the deeper the extending depth of the adjustable extension section 21 is, and the more the value of the velocity v is close to the second preset condition, the shallower the extending depth of the adjustable extension section 21 is.
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 [380,430)), the static pressure parameter at the fan outlet meets a first preset condition, and at this time, the adjusting mechanism 3 is controlled to move so that the adjustable extension section 21 is at the first adjusting position, that is, the movable extension section 212 has its outer edge adjacent to the inner edge of the fixed extension section 211, and at the first adjusting position, the specific moving stroke of the movable extension section 212 also needs to be finely adjusted;
when P is presentsE [0,150 ]), the static pressure parameter of the air outlet of the fan meets a second preset condition, and at the moment, the adjusting mechanism 3 is controlled to move, so that the adjustable extension section 21 is in the second adjusting position, namely the inner edge of the movable extension section 212The inner edge of the fixed extension 211 is retracted, and at the second adjustment position, the specific amount of retraction also needs to be finely adjusted;
when P is presentsE [300,380)), the static pressure 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 adjustable extension section 21 is in the transition adjusting position, namely the position between the first adjusting position and the second adjusting position;
when P is presentsWhen the static pressure parameter belongs to [150,300 ], the static pressure parameter at the air outlet of the fan meets a third preset condition, at this time, the adjusting mechanism 3 is controlled to move, so that the adjustable extension section 21 is located at the transitional adjusting position, namely, the position between the first adjusting position and the second adjusting position, it should be noted that when the static pressure parameter at the air outlet of the fan meets the third preset condition, the more the value of the static pressure Ps is close to the first preset condition, the deeper the extending depth of the adjustable extension section 21 is, and the more the value of the static pressure Ps is close to the second preset condition, the shallower the extending depth of the adjustable extension section 21 is.
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 [90,135), the motor power parameter satisfies a first preset condition, and at this time, the adjusting mechanism 3 is controlled to move so that the adjustable extension section 21 is in the first adjusting position, that is, the movable extension section 212 has its outer edge adjacent to the inner edge of the fixed extension section 211, and at the first adjusting position, the specific moving stroke of the movable extension section 212 also needs to be finely adjusted;
when P is presentsE [240,255)), the motor power parameter satisfies a second preset condition, and at this time, the adjusting mechanism 3 is controlled to move so that the adjustable extension section 21 is at the second adjusting position, i.e. the inner edge of the movable extension section 212 retracts relative to the inner edge of the fixed extension section 211, and at the second adjusting position, the specific retraction amount also needs to be finely adjusted；
When P is presentsE [135,190)), the motor power parameter meets a third preset condition, at this time, the adjusting mechanism 3 is controlled to move, so that the adjustable extension section 21 is in the transition adjusting position, namely, the position between the first adjusting position and the second adjusting position;
when P is presentsE [190,240)), the motor power parameter satisfies a third preset condition, and at this time, the adjusting mechanism 3 is controlled to move, so that the adjustable extension section 21 is located at the transitional adjustment position, i.e., the position between the first adjustment position and the second adjustment position, it should be noted that, when the motor power parameter satisfies the third preset condition, the value of the power P is closer to the first preset condition, the depth of the adjustable extension section 21 is deeper, and the value of the power P is closer to the second preset condition, the depth of the adjustable extension section 21 is shallower.
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 e [1350,1450), the wind turbine rotation speed parameter satisfies a first preset condition, and at this time, the adjusting mechanism 3 is controlled to move, so that the adjustable extension section 21 is located at the first adjusting position, that is, the movable extension section 212 has its outer edge adjacent to the inner edge of the fixed extension section 211, and at the first adjusting position, the specific moving stroke of the movable extension section 212 also needs to be finely adjusted;
when R e [900,1100), the wind turbine rotation speed parameter satisfies a second preset condition, and at this time, the adjusting mechanism 3 is controlled to move, so that the adjustable extension section 21 is located at the second adjusting position, that is, the inner edge of the movable extension section 212 retracts relative to the inner edge of the fixed extension section 211, and at the second adjusting position, the specific amount of retraction also needs to be finely adjusted;
when P is presentsWhen the parameters belong to the element [1250,1350 ], the rotating speed parameter of the wind wheel meets a third preset condition, and at the moment, the adjusting mechanism 3 is controlled to move so as to lead the adjusting mechanism to be enabled to be in an active stateThe adjustable extension 21 is brought to the transitional adjustment position, i.e. to a position between the first adjustment position and the second adjustment position.
When P is presentsE [1100,1250)), the wind wheel rotation speed parameter meets a third preset condition, at this time, the adjusting mechanism 3 is controlled to move, so that the adjustable extension section 21 is located at the transition adjusting position, namely, the position between the first adjusting position and the second adjusting position, it should be noted that, when the wind wheel rotation speed parameter meets the third preset condition, the value of the rotation speed R is closer to the first preset condition, the depth of the adjustable extension section 21 is deeper, and the value of the rotation speed R is closer to the second preset condition, the depth of the adjustable extension section 21 is shallower.
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:
a volute;
the centrifugal wind wheel is arranged in the volute;
the air guide ring is arranged at an air inlet of the volute and comprises an annular extension part extending into the volute, at least part of the annular extension part is provided with an adjustable extension section, and the width of the adjustable extension section is adjustable along the air inlet direction, so that the extending depth of the air guide ring is adjustable; and the number of the first and second groups,
and the adjusting mechanism is used for changing the width of the adjustable part of the width of the adjustable extension section.
2. The centrifugal fan of claim 1, wherein the adjustable extension is provided in plurality.
3. The centrifugal fan of claim 2 wherein a plurality of the adjustable extensions extend into the volute at varying depths such that an inner edge of the annular extension is at least partially stepped.
4. The centrifugal fan of claim 2, wherein a plurality of the adjustable extensions collectively form an adjustable extension group having a ratio of greater than or equal to 1/4 of an inner edge of the annular extension.
5. The centrifugal fan of claim 2, wherein the number of adjustable extensions is greater than or equal to 2 and less than or equal to 12.
6. The centrifugal fan of claim 1, wherein the adjustable extension is disposed adjacent an air outlet of the centrifugal fan.
7. The centrifugal fan according to claim 6, wherein a section which passes through a center line of an air outlet of the centrifugal fan and is parallel to a center line of a centrifugal rotor of the centrifugal fan is a mounting reference plane;
the midpoint of the adjustable extension is located at the mounting reference plane.
8. The centrifugal fan of claim 1, wherein the adjustable extension includes a fixed extension and a movable extension at least partially in an overlapping arrangement, the movable extension being movable relative to the fixed extension.
9. The centrifugal fan according to claim 8, wherein the adjustment mechanism comprises a linear driving structure, a fixed end of the linear driving structure is disposed on the fixed extension section, and a movable end of the linear driving structure is drivingly connected to the movable extension section.
10. The centrifugal fan of claim 9, wherein the adjustable extension is provided in plurality;
the corresponding linear driving structures are arranged in plurality.
11. The centrifugal fan of claim 9, wherein the linear drive structure is one of a cylinder, a ram, or an electric ram.
12. The centrifugal fan of claim 8, wherein the movable extension has a first adjusted position in which an outer edge of the movable extension abuts an inner edge of the fixed extension, a second adjusted position in which the inner edge of the movable extension is retracted relative to the inner edge of the fixed extension, and a transitional adjusted position between the first adjusted position and the second adjusted position in the direction of the intake air.
13. The centrifugal fan of claim 1, wherein the air guide ring further comprises an annular guide portion, the annular guide portion is disposed at an outer edge of the annular extension portion, and the annular guide portion is at least partially arranged in a necking shape in an air inlet direction.
14. The centrifugal fan of claim 13, wherein the longitudinal cross-section of the annular guide is two arc segments; alternatively, the first and second electrodes may be,
the longitudinal section of the annular guide part is two oblique line segments.
15. The centrifugal fan as claimed in claim 13, wherein the wind-guiding ring further comprises a mounting portion disposed at an outer edge of the annular guide portion, the mounting portion being configured to be mounted to the volute.
16. A range hood comprising a centrifugal fan according to any one of claims 1 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
CN114251286A (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 supply 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
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
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
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