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CN114251289B - Centrifugal fan and volute tongue and range hood thereof - Google Patents

Centrifugal fan and volute tongue and range hood thereof Download PDF

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Publication number
CN114251289B
CN114251289B CN202011029860.XA CN202011029860A CN114251289B CN 114251289 B CN114251289 B CN 114251289B CN 202011029860 A CN202011029860 A CN 202011029860A CN 114251289 B CN114251289 B CN 114251289B
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CN
China
Prior art keywords
air
air guide
volute tongue
centrifugal fan
air outlet
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.)
Active
Application number
CN202011029860.XA
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Chinese (zh)
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CN114251289A (en
Inventor
边乐超
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
Priority date (The priority date 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 date listed.)
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Application filed by Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd filed Critical Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority to CN202011029860.XA priority Critical patent/CN114251289B/en
Priority to PCT/CN2020/123718 priority patent/WO2022062032A1/en
Publication of CN114251289A publication Critical patent/CN114251289A/en
Application granted granted Critical
Publication of CN114251289B publication Critical patent/CN114251289B/en
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Classifications

    • 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
    • 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
    • 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
    • F04D29/422—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
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • 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
    • 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
    • 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
    • F24C15/2028—Removing cooking fumes using an air curtain
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise

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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, a volute tongue thereof and a range hood. The volute tongue comprises a volute tongue body, an air guide structure and a blowing device, wherein the volute tongue body is provided with an air guide surface, and the air guide surface is used for guiding airflow formed by a wind wheel of the centrifugal fan to an air outlet of the centrifugal fan; the air guide structure comprises an air flow channel formed in the volute tongue body and an air outlet orifice communicated with the air flow channel and formed on the air guide surface, and the air outlet orifice is arranged towards the air guide direction of the air guide surface; the blowing device is communicated with the air flow channel and used for conveying air flow flowing to the air outlet orifice to the air flow channel, so that the air flow guided out of the air outlet orifice can flow along the air guide direction of the air guide surface, and an air curtain is formed on the air guide surface. The invention actively supplies air through the air blowing device, so that the self-adaptive effect of the centrifugal fan is better, the centrifugal fan can be suitable for different working conditions, and the application range of the centrifugal fan is wider.

Description

Centrifugal fan and volute tongue and range hood thereof
Technical Field
The invention relates to the technical field of kitchen appliances, in particular to a centrifugal fan, a volute tongue thereof and a range hood.
Background
The volute tongue in the centrifugal fan mainly functions to split airflow at the outlet of the volute, the airflow at the outlet of the volute is high in flow velocity, and high-speed airflow can impact the volute tongue to generate high-frequency pneumatic noise; the backflow at the volute tongue can cause energy loss, and the static pressure at the outlet is reduced, so that the use of the fan cannot meet the requirements of users.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a centrifugal fan, a volute tongue thereof and a range hood thereof, and aims to improve the performance of a conventional fan and improve user experience.
In order to achieve the above object, the present invention provides a volute tongue for use in a centrifugal fan, the volute tongue comprising:
the volute tongue body is provided with an air guide surface, and the air guide surface is used for guiding airflow formed by a wind wheel of the centrifugal fan to an air outlet of the centrifugal fan;
the air guide structure comprises an air flow channel formed in the volute tongue body and an air outlet orifice communicated with the air flow channel and formed in the air guide surface, and the air outlet orifice is arranged towards the air guide direction of the air guide surface; and the number of the first and second groups,
and the blowing device is communicated with the airflow channel and is used for conveying airflow flowing to the air outlet hole to the airflow channel so that the airflow guided out of the air outlet hole can flow along the air guide direction of the air guide surface to form an air curtain on the air guide surface.
In one embodiment, the blowing device is arranged at one end of the volute tongue body, an air inlet hole communicated with the airflow channel is formed in the volute tongue body, and the blowing device is connected to the air inlet hole.
In one embodiment, the blowing device comprises an exhaust fan communicated with the air inlet hole, and the exhaust fan is used for guiding the airflow outside the volute from the air inlet hole into the airflow channel.
In an embodiment, in the wind guiding direction of the wind guiding surface, the wind outlet opening has a front edge and a rear edge, and a wind outlet guiding portion is formed at the front edge of the wind outlet opening to guide the airflow of the airflow channel toward the wind guiding direction of the wind guiding surface.
In an embodiment, in the wind guiding direction of the wind guiding surface, the wind guiding surface includes a front wind guiding surface section located behind the wind outlet, the wind outlet guiding portion extends along a direction parallel to the front wind guiding surface section, and an end of the wind outlet guiding portion extends to a position opposite to the front wind guiding surface section.
In one embodiment, the volute tongue body comprises:
the enclosure is arranged on one side of the enclosure, which is provided with the air outlet hole, in a non-closed manner, and comprises a first air guide side part and a second air guide side part on one side corresponding to the air outlet hole, and the first air guide side part and the second air guide side part are spaced to form the air outlet hole; and the number of the first and second groups,
and the two end shells are correspondingly arranged at the two ends of the enclosure shell.
In an embodiment, the air guide surface is formed on the second air guide side portion, an end of the first air guide side portion extends to an outer side of the second air guide side portion and is spaced apart from the second air guide side portion, and an end of the first air guide side portion forms the air outlet guide portion.
The present invention also provides a centrifugal fan comprising:
the volute defines a mounting cavity 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 the number of the first and second groups,
and the centrifugal wind wheel is rotatably arranged in the mounting cavity.
In one embodiment, the method further comprises:
the monitoring device is used for monitoring working parameters of the centrifugal fan; and (c) a second step of,
and the control device is electrically connected with the monitoring device and used for controlling the working state of the blowing device according to the obtained working parameters.
The invention provides a range hood, which comprises a centrifugal fan, wherein the centrifugal fan comprises:
the volute defines a mounting cavity 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; and the number of the first and second groups,
and the centrifugal wind wheel is rotatably arranged in the mounting cavity.
In the technical scheme provided by the invention, the airflow channel is formed in the volute tongue body and is communicated with the blowing device, so that the blowing device can convey airflow flowing to the air outlet hole to the airflow channel, the airflow guided out from the air outlet hole can flow along the air guide direction of the air guide surface, an air curtain is formed on the air guide surface, when the volute tongue is applied to a centrifugal fan and the flow rate of guided air in the centrifugal fan is larger, the impact on the volute tongue is larger, and larger noise can be generated, at the moment, the blowing device provides airflow to the air guide surface to form the air curtain on the air guide surface, so that the impact of the guided air on the volute tongue can be reduced, the noise of the centrifugal fan is reduced, the user experience is improved, and the blowing device actively feeds air, so that the self-adaptive effect of the centrifugal fan is better, the centrifugal fan is applicable to different working conditions, so that the application range of the centrifugal fan is wider.
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 structural diagram of an embodiment of a range hood provided by the present invention;
FIG. 2 is a schematic view of the volute tongue shown in FIG. 1;
FIG. 3 is a schematic cross-sectional view of the volute tongue shown in FIG. 2;
FIG. 4 is a schematic diagram of a control structure of the centrifugal fan of FIG. 1;
fig. 5 is a schematic perspective view of an embodiment of a range hood including the centrifugal fan in fig. 1;
FIG. 6 is a schematic view of a partial cross-sectional structure of the range hood of FIG. 5;
fig. 7 is a schematic partial cross-sectional perspective view of the range hood of fig. 5 (with a first outlet duct at a first angle);
fig. 8 is a schematic partial cross-sectional perspective view of the range hood of fig. 5 (with a second air outlet pipe at a first angle);
fig. 9 is a schematic partial cross-sectional perspective view of the range hood of fig. 5 (at a second angle);
fig. 10 is a schematic perspective view of the range hood in fig. 5 (at a third angle) in partial cross-section;
FIG. 11 is an enlarged view of detail A of FIG. 10;
FIG. 12 is a diagram illustrating a server architecture of a hardware operating environment according to an embodiment of the present invention;
fig. 13 is a schematic flow chart of an embodiment of an air outlet control method of a centrifugal fan according to the present invention.
The reference numbers illustrate:
reference numerals Name(s) Reference numerals Name (R)
100 Centrifugal fan 200 Monitoring device
1 Spiral casing 201 First anemometer
2 Volute tongue 2011 Total pressure hole
21 Volute tongue body 2012 First static pressure hole
211 Enclosure shell 202 Rectifying grid
212 End shell 203 Current sensor
213 Air guide surface 204 Reflected photoelectric measuring device
214 Air outlet and guiding part 2041 Laser transmitter
215 Front section of air guide surface 2042 Laser receiver
22 Air guide structure 2043 Reflector plate
22a Air outlet orifice 205 First air outlet pipe
22b Air inlet 206 Second air outlet pipe
3 Air blowing device 207 Second air velocity tube
31 Air draft fan 208 Second static pressure hole
4 Centrifugal wind wheel 300 Control device
1000 Smoke exhaust ventilator
The object of the present invention, its functional characteristics and advantageous effects will be further described with reference to the following embodiments and 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 indication is involved in the embodiment of the present invention, the directional indication is only used for explaining the relative positional relationship, the motion situation, and the like between the components in a certain posture, and if the certain posture is changed, the directional indication is 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, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other 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 airflow at the outlet of the volute, the airflow at the outlet of the volute is high in flow velocity, and high-speed airflow can impact the volute tongue to generate high-frequency pneumatic noise; the backflow at the volute tongue can cause energy loss, and the static pressure at the outlet is reduced, so that the fan cannot meet the requirements of users.
In view of this, the present invention provides a range hood, which includes a centrifugal fan, the centrifugal fan includes a volute tongue, and any centrifugal fan including the volute tongue is within the protection scope of the present invention, and similarly, any range hood or other equipment including the centrifugal fan of the present invention is also within the protection scope of the present invention, and fig. 1 to 13 are embodiments of the centrifugal fan, the volute tongue thereof, and the range hood provided by the present invention.
Referring to fig. 1 to fig. 2, in an embodiment of the present invention, the volute tongue 2 includes a volute tongue body 21, an air guiding structure 22 and a blowing device 3, the volute tongue body 21 has an air guiding surface 213, and the air guiding surface 213 is used for guiding an air flow formed by a wind wheel of the centrifugal fan 100 to an air outlet of the centrifugal fan 100; the air guiding structure 22 comprises an air flow channel formed in the volute tongue body 21 and an air outlet 22a communicated with the air flow channel and formed on the air guiding surface 213, and the air outlet 22a is arranged towards the air guiding direction of the air guiding surface 213; the blowing device 3 is communicated with the airflow channel, and is configured to deliver the airflow flowing to the air outlet 22a to the airflow channel, so that the airflow guided out from the air outlet can flow along the air guiding direction of the air guiding surface 213, so as to form an air curtain on the air guiding surface 213.
In the technical solution provided by the present invention, an airflow channel is formed in the volute tongue body 21, and the airflow channel is communicated with the blowing device 3, so that the blowing device 3 can convey the airflow flowing to the air outlet 22a to the airflow channel, so that the airflow guided out from the air outlet can flow along the air guiding direction of the air guiding surface 213, so as to form an air curtain on the air guiding surface 213, when the volute tongue 2 is applied to the centrifugal fan 100, and the flow rate of the guided air in the centrifugal fan 100 is large, the impact on the volute tongue 2 is large, and large noise is generated, at this time, the blowing device 3 provides the airflow to the air guiding surface 213, so as to form the air curtain on the air guiding surface 213, so that the impact of the guided air on the volute tongue 2 can be reduced, the noise of the centrifugal fan 100 is reduced, user experience is improved, and the blowing device 3 actively feeds air, make centrifugal fan 100's self-adaptation effect is better to applicable in the operating mode of difference, make centrifugal fan 100's application scope wider.
In an embodiment, the blowing device 3 may be disposed in the volute tongue body 21 to be located in the airflow channel to form an airflow flowing out from the air outlet 22 a.
In another embodiment, referring to fig. 2 and 3, the blowing device 3 is disposed at one end of the volute tongue body 21, and the volute tongue body 21 is provided with an air inlet 22b communicated with the air flow channel, and the blowing device 3 is connected to the air inlet 22b to form an air curtain by guiding the air flow outside the volute tongue body 21 into the air flow channel and flowing out from the air outlet 22a, so as to reduce the impact of the air flow on the volute tongue 2. Of course, a connection pipe may be disposed at the air inlet hole 22b, so as to dispose the exhaust fan 31 in the connection pipe, or dispose the exhaust fan 31 outside the connection pipe.
The blowing device 3 can be arranged in various forms. In an embodiment of the present invention, the blowing device 3 includes an exhaust fan 31 communicated with the air inlet hole 22b, and the exhaust fan 31 is configured to guide the airflow outside the scroll casing 1 from the air inlet hole 22b into the airflow channel to actively form an air curtain.
The arrangement form of the blowing device 3 is not limited to the above one, for example, the blowing device 3 may be arranged as a pump structure to input the air flow into the air flow passage.
In order to make the air flow guided out from the air outlet 22a flow along the air guiding surface 213 better so as to form an air curtain, the air outlet 22a has a front edge and a rear edge in the air guiding direction of the air guiding surface 213, and an air outlet guiding portion 214 is formed at the front edge of the air outlet 22a to guide the air flow of the air flow channel toward the air guiding direction of the air guiding surface 213, so that the air flowing out from the air outlet 22a can flow along the air guiding surface 213 without diffusion.
Further, in the wind guiding direction of the wind guiding surface 213, the wind guiding surface 213 includes a wind guiding surface front section 215 located at the rear side of the wind outlet 22a, the wind outlet guiding portion 214 extends along a direction parallel to the wind guiding surface 213 front section, and the end of the wind outlet guiding portion 214 extends to a position opposite to the wind guiding surface 213 front section, and a uniform wind outlet gap is formed between the wind outlet guiding portion 214 and the wind guiding surface 213 front section, so that the wind outlet is more uniform, and the wind guiding effect is better.
Specifically, when the volute body 21 includes an enclosure 211 and two end shells 212, the enclosure 211 defines a cavity with two open ends, the enclosure 211 is in a non-closed arrangement on a side where the air outlet 22a is formed, and includes a first air guiding side portion and a second air guiding side portion on a side corresponding to the air outlet 22a, and the first air guiding side portion and the second air guiding side portion are spaced apart to form the air outlet 22 a; the two end shells 212 are correspondingly arranged at two ends of the enclosure shell 211 to seal the cavity to form the airflow channel.
Furthermore, the air guide surface 213 is formed on the second air guide side portion, the end of the first air guide side portion extends to the outside of the second air guide side portion and is arranged at an interval with the second air guide side portion, the end of the first air guide side portion is formed to be the air outlet air guide portion 214, the air outlet air guide portion 214 is formed on one side of the enclosure 211, and the enclosure 211 is integrally formed, so that the structure is simple and the manufacturing is more convenient.
Referring to fig. 4 to 6, a centrifugal fan 100 according to the present invention includes a volute 1, a volute tongue 2 and a centrifugal wind wheel 4, wherein the volute 1 defines an installation cavity and an air outlet channel extending from one side of the installation cavity; the volute tongue 2 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; the centrifugal wind wheel 4 is rotatably mounted in the mounting cavity, and the centrifugal fan 100 includes all technical features described in the above embodiment of the volute tongue 2, and therefore has all technical effects described in the above embodiment of the volute tongue 2, which is not described in detail herein.
Referring to fig. 4, the blowing device 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, the control device 300 is electrically connected to the monitoring device 200, and is used to control the blowing device 3 to operate according to the obtained working parameter, and automatically adjust the air output at the air outlet 22a of the volute tongue 2 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, when the control device 300 controls the blowing device 3 to work 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. 7, the flow rate measuring device includes a first anemometer 201, a total pressure hole 2011 of the first anemometer 201 is configured to be opposite to an airflow at the air outlet of the centrifugal fan 100, a total pressure Pt of a gas on the anemometer 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 through the first static pressure hole 2012
Figure BDA0002700529910000081
The flow velocity of the gas flowing through the first anemometer 201 can be obtained, and the measurement is accurate, it should be noted thatThe manner of measuring the wind speed at the wind outlet of the centrifugal fan 100 by the first wind speed pipe 201 is adopted in the prior art, and will not be described in detail here.
The air flow of the air speed at the air outlet of the centrifugal fan 100 is not uniform, and the flow speed of the air flow measured by the first air speed pipe 201 cannot well reflect the gas flow state on the whole air outlet duct, in an embodiment, the air outlet of the centrifugal fan 100 is provided with a first air outlet pipe 205, a rectification grid 202 is arranged in the first air outlet pipe 205, the rectification grid 202 is used for dividing the inner cavity of the first air outlet pipe 205 into a plurality of pipe flow channels arranged in parallel, the first air speed pipe 201 is positioned on one side of the rectification grid 202, which is opposite to the air outlet of the centrifugal fan 100, and is arranged corresponding to one of the pipe flow channels, the air flow is uniformly distributed in each pipe flow channel by the rectification function of the rectification grid 202, and the gas of the local air flow measured by the first air speed pipe 201 can reflect the whole gas flow speed condition on the air outlet duct, has better effect.
In one embodiment, the rectifying grid 202 includes a plurality of grid plates disposed in a staggered manner, and the overall duct of the first air outlet duct 205 is conveniently divided into a plurality of duct channels by the staggered grid plates.
In order to obtain the static pressure parameter at the air outlet of the fan, the monitoring device 200 includes a static pressure measuring device disposed at the air outlet of the centrifugal fan 100 for measuring the static pressure parameter at the air outlet of the fan, and the static pressure measuring device may be measured by a differential pressure gauge, in an embodiment, please refer to fig. 8, the static pressure measuring device includes a second air outlet pipe 206 disposed at the air outlet of the centrifugal fan 100, a second air speed pipe 207 is disposed in the second air outlet pipe 206, and a second static pressure hole 208 is disposed on a side wall of the second air speed pipe 207, so that the static pressure in the second air speed pipe 207 can be conveniently obtained, and the static pressure parameter at the air outlet of the fan can be further obtained.
Of course, the above-mentioned rectification grating 202 may also be used to rectify the airflow in the second air outlet pipe 206, so that the airflow is uniformly distributed in the second air outlet pipe 206, and the gas of the local airflow measured by the second air speed pipe 207 may reflect the overall gas flow speed on the air outlet duct, thereby achieving a better effect.
In order to obtain the power parameter of the motor, in an embodiment, the monitoring device 200 includes a power monitoring device for monitoring the output power of the driving motor of the wind wheel, so that the output power of the driving motor of the wind wheel can be conveniently obtained, and the working state of the centrifugal fan 100 can be well reflected.
In an embodiment, referring to fig. 8, the power monitoring device includes a current sensor 203 for monitoring the 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 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. 9 and fig. 10, 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. 11, fig. 11 is a schematic structural diagram of the air outlet control device of the centrifugal fan of the present invention.
As shown in fig. 11, the centrifugal fan air outlet control device may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 11 does not constitute a limitation of the centrifugal fan wind control device and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in fig. 11, the memory 1005 as a 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. 11, 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 blowing device 3 to adjust the working state according to the obtained actual adjusting parameters.
Based on the above hardware structure, fig. 12 is an embodiment of the air outlet control method of the centrifugal fan provided by the present invention.
Referring to fig. 12, in the present embodiment, the air outlet control method of the 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 relationship that needs to be written into a control program of 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 blowing device 3 to adjust the working state according to the obtained actual adjusting parameters;
it should be noted that, after the actual adjustment parameters are obtained, the blowing device 3 may be adjusted, for example, the blowing device 3 adjusts the air outlet flow rate 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 is increased on the premise of keeping the air volume to overcome the resistance of smoke exhaust, at this time, the blowing device 3 is adjusted to be at a high-grade air outlet volume, which is beneficial to guiding the airflow to the air outlet of the centrifugal fan, increasing the air outlet volume of the centrifugal fan, and increasing the static pressure; the resistance at the outlet of the fan is moderate, and the air blowing device 3 is adjusted to be in the middle-grade air output in consideration of the comprehensive requirements of the air output and the static pressure; 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 blowing device 3 can be adjusted to be at a low-gear air output, 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 air blowing device 3 is controlled to adjust the working state according to the obtained actual adjusting parameters, so that the air blowing device 3 is automatically adjusted according to the working state of the centrifugal fan 100 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, the blowing device has a first working state, a second working state and a third working state in which the output air volume is gradually increased, and the first mapping relationship is as follows:
when the working parameters meet a first preset condition, adjusting the blowing device 3 to enable the blowing device 3 to be in the first working state;
when the working parameters meet a second preset condition, adjusting the blowing device 3 to enable the blowing device 3 to be in the third working state;
when the working parameters meet a third preset condition, adjusting the blowing device 3 to enable the blowing device 3 to be in the second working state;
in the embodiment of the present invention, different preset conditions are set, the blowing device 3 is controlled 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 scroll casing 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 operating parameters, and the following description is given by driving the blowing device 3 to move under different preset conditions under different operating 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 is (0, 8), the flow speed parameter of the air outlet of the fan meets a first preset condition, and at the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the first working state;
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 the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the third working state;
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 blowing device 3 is adjusted to enable the blowing device 3 to be in the third working state;
2. when the working parameter is a static pressure parameter of the air outlet of the fan, the control example of the centrifugal fan 100 according to a specific model is as follows (static pressure Ps unit Pa):
when P is s E [300,430), the flow speed parameter of the air outlet of the fan meets a first preset condition, and at the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the first working state;
when P is present s E [0,150), the flow speed parameter of the air outlet of the fan meets a second preset condition, and at the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the third working state;
when P is present s E [150,300), the flow speed parameter of the air outlet of the fan meets a third preset condition, and at the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the second working state;
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 present s E [135,190), the flow speed parameter of the air outlet of the fan meets a first preset condition, and at the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the first working state;
when P is present s E [240,255), the flow speed parameter of the air outlet of the fan meets a second preset condition, and at the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the third working state;
when P is present s E [190,240), the flow speed parameter of the air outlet of the fan meets a third preset condition, and at the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the second working state;
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 flow speed parameter of the air outlet of the fan meets a first preset condition, and at the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the first working state;
when R belongs to [1100,1250 ], the flow speed parameter of the air outlet of the fan meets a second preset condition, and at the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the third working state;
when P is present s E [1250,1350), the flow speed parameter of the air outlet of the fan meets a third preset condition, and at the moment, the blowing device 3 is adjusted to enable the blowing device 3 to be in the second working state.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the specification and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims (10)

1. A volute tongue for use in a centrifugal fan, the volute tongue comprising:
the volute tongue body is provided with an air guide surface, and the air guide surface is used for guiding airflow formed by a wind wheel of the centrifugal fan to an air outlet of the centrifugal fan;
the air guide structure comprises an air flow channel formed in the volute tongue body and an air outlet orifice communicated with the air flow channel and formed in the air guide surface, and the air outlet orifice is arranged towards the air guide direction of the air guide surface; and the number of the first and second groups,
and the blowing device is communicated with the airflow channel and is used for conveying airflow flowing to the air outlet hole to the airflow channel so that the airflow guided out of the air outlet hole can flow along the air guide direction of the air guide surface to form an air curtain on the air guide surface.
2. The volute tongue as claimed in claim 1, wherein the blowing device is disposed at one end of the volute tongue body, and the volute tongue body is provided with an air inlet hole communicated with the airflow channel, and the blowing device is connected to the air inlet hole.
3. The volute tongue as claimed in claim 2, wherein the blower includes an extractor fan in communication with the air inlet opening, the extractor fan being configured to direct air flow outside the volute from the air inlet opening into the airflow path.
4. The volute tongue as claimed in claim 1, wherein the outlet opening has a front edge and a rear edge in the wind guiding direction of the wind guiding surface, and an outlet wind guiding portion is formed at the front edge of the outlet opening to guide the airflow of the airflow channel in the wind guiding direction of the wind guiding surface.
5. The volute tongue as claimed in claim 4, wherein the air guide surface includes a front section of the air guide surface located behind the air outlet opening in the air guide direction of the air guide surface, the air outlet guide portion extends in a direction parallel to the front section of the air guide surface, and an end of the air outlet guide portion extends to be opposite to the front section of the air guide surface.
6. The volute tongue of claim 4, wherein the volute tongue body comprises:
the enclosure is arranged on one side of the enclosure, which is provided with the air outlet hole, in a non-closed manner, and comprises a first air guide side part and a second air guide side part on one side corresponding to the air outlet hole, and the first air guide side part and the second air guide side part are spaced to form the air outlet hole; and the number of the first and second groups,
and the two end shells are correspondingly arranged at the two ends of the enclosure shell.
7. The volute tongue as claimed in claim 6, wherein the air guide surface is formed on the second air guide side portion, a distal end of the first air guide side portion extends outside the second air guide side portion and is spaced apart from the second air guide side portion, and a distal end of the first air guide side portion forms the outlet air guide portion.
8. A centrifugal fan, comprising:
the volute defines a mounting cavity and an air outlet channel extending from one side of the mounting cavity;
the volute tongue as claimed in any one of claims 1 to 7, wherein the volute tongue is disposed at a junction between the outlet channel and the mounting cavity, and extends and protrudes toward a center of the outlet channel; and the number of the first and second groups,
and the centrifugal wind wheel is rotatably arranged in the mounting cavity.
9. The centrifugal fan as recited in claim 8, further comprising:
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 working state of the blowing device according to the obtained working parameters.
10. A range hood comprising a centrifugal fan according to any one of claims 8 to 9.
CN202011029860.XA 2020-09-25 2020-09-25 Centrifugal fan and volute tongue and range hood thereof Active CN114251289B (en)

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