CN113309714B - Multi-wing centrifugal fan and household appliance - Google Patents

Multi-wing centrifugal fan and household appliance Download PDF

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Publication number
CN113309714B
CN113309714B CN202110605278.1A CN202110605278A CN113309714B CN 113309714 B CN113309714 B CN 113309714B CN 202110605278 A CN202110605278 A CN 202110605278A CN 113309714 B CN113309714 B CN 113309714B
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CN
China
Prior art keywords
section
volute
hub
centrifugal fan
wing centrifugal
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
CN202110605278.1A
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Chinese (zh)
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CN113309714A (en
Inventor
任志文
林健
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.)
Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Original Assignee
Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
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Application filed by Midea Group Co Ltd, Guangdong Midea Kitchen Appliances Manufacturing Co Ltd filed Critical Midea Group Co Ltd
Priority to CN202110605278.1A priority Critical patent/CN113309714B/en
Publication of CN113309714A publication Critical patent/CN113309714A/en
Priority to PCT/CN2021/140408 priority patent/WO2022143328A1/en
Application granted granted Critical
Publication of CN113309714B publication Critical patent/CN113309714B/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
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • 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
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • F04D25/163—Combinations of two or more pumps ; Producing two or more separate gas flows driven by a common gearing arrangement
    • 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
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—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
    • 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
    • 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
    • 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
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a multi-wing centrifugal fan and a household appliance. The multipurpose centrifugal fan includes: the impeller assembly comprises an impeller body and a hub, wherein the hub comprises a first side surface and a second side surface which are opposite to each other, the impeller body comprises a first section and a second section, the first section is connected to the first side surface, the second section is connected to the second side surface, and the diameter of the first section and the diameter of the second section are gradually increased along the direction away from the hub; the volute comprises a volute body and a volute tongue, the impeller assembly is arranged in the volute body, and the volute tongue is spaced from the impeller assembly; and the motor is connected with the hub and used for driving the impeller assembly to rotate. According to the multi-wing centrifugal fan, noise in the area close to the hub is reduced, and the volute tongue gap in the area far from the hub is reduced by increasing the volute tongue gap in the area close to the hub, so that work efficiency in the area far from the hub is increased.

Description

Multi-wing centrifugal fan and household appliance
Technical Field
The invention relates to the technical field of fans, in particular to a multi-wing centrifugal fan and a household appliance.
Background
The multi-wing centrifugal fan is widely applied to industrial equipment, such as a range hood product, due to the advantages of large air quantity, small noise, low cost and the like.
However, in the prior art, the air flow is unbalanced in the axial direction of the multi-wing centrifugal fan, so that the multi-wing centrifugal fan has larger noise in the use process, and the method for reducing the noise of the multi-wing centrifugal fan generally has larger influence on the working efficiency of the multi-wing centrifugal fan.
Disclosure of Invention
The embodiment of the invention provides a multi-wing centrifugal fan and a household appliance.
The multi-wing centrifugal fan comprises an impeller assembly and a hub, wherein the hub comprises a first side face and a second side face which are opposite to each other, the impeller body comprises a first section and a second section, the first section is connected to the first side face, the second section is connected to the second side face, and the diameter of the first section and the diameter of the second section are gradually increased along the direction away from the hub;
the volute comprises a volute body and a volute tongue, the impeller assembly is arranged in the volute body, and the volute tongue is spaced from the impeller assembly;
and the motor is connected with the hub and used for driving the impeller assembly to rotate.
In some embodiments, the motor is located on a side of the second side, the first section has a length B1, and the second section has a length B2, B1> B2, and B1, B2>0.
In certain embodiments, the outer diameter of the first section is at an angle a1 to the axial direction of the first section, the outer diameter of the second section is at an angle a2 to the axial direction of the second section, a1< a2, a1 is greater than or equal to 0 ° and 0 ° < a2<10 °.
In certain embodiments, the impeller body has equal diameters at both ends.
In certain embodiments, the impeller assembly has a maximum outer diameter D1, the second section has a length B2,0.4 x d1.ltoreq.b2.ltoreq.d1 and D1, B2>0.
In some embodiments, the radius at the junction of the volute tongue and the volute body is a volute radius that gradually increases in a direction toward the hub.
In some embodiments, the radius of the volute near the motor is R1, the radius of the volute far from the motor is R2, the radius of the volute near the hub is R3, R1< R2< R3, and R1, R2, R3>0.
In some embodiments, the volute tongue depth increases progressively in a direction away from the hub.
In certain embodiments, the impeller assembly further comprises a stiffener mounted to the impeller body.
The household appliance of the embodiment of the invention comprises the multi-wing centrifugal fan of the embodiment.
According to the multi-wing centrifugal fan and the household appliance, the diameters of the first section and the second section are gradually increased along the direction away from the hub, so that the gap between the impeller body and the volute tongue is gradually increased along the direction close to the hub, the volute tongue gap in the area close to the hub is increased, the noise is reduced, the volute tongue gap in the area away from the hub is reduced, and the acting efficiency is increased.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic view of a multi-wing centrifugal fan according to an embodiment of the present invention;
FIG. 2 is another schematic structural view of a multi-wing centrifugal fan according to an embodiment of the present invention;
FIG. 3 is a schematic view of the impeller assembly of an embodiment of the present invention;
fig. 4 is an enlarged view at a in fig. 3;
FIG. 5 is a rear view of a volute of a multi-wing centrifugal fan of an embodiment of the invention;
FIG. 6 is a cross-sectional view taken at B-B in FIG. 5;
FIG. 7 is a cross-sectional view taken at B-B of FIG. 5;
FIG. 8 is a cross-sectional view taken at C-C of FIG. 5;
FIG. 9 is a cross-sectional view taken at D-D of FIG. 5;
the main feature reference numerals:
the multi-wing centrifugal fan 100, the impeller assembly 10, the impeller body 11, the first section 11a, the second section 11b, the hub 12, the first side 121, the second side 122, the reinforcing ribs 13, the volute 20, the volute body 21, the volute tongue 22 and the motor 30.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the embodiments of the present invention and are not to be construed as limiting the embodiments of the present invention.
In an embodiment of the invention, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different structures of embodiments of the invention. In order to simplify the disclosure of embodiments of the present invention, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Embodiments of the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and do not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
Referring to fig. 1 to 3, a multi-wing centrifugal fan 100 according to an embodiment of the present invention includes an impeller assembly 10, a volute 20, and a motor 30. The impeller assembly 10 comprises an impeller body 11 and a hub 12, the hub 12 comprises a first side 121 and a second side 122 which are opposite to each other, the impeller body 11 comprises a first section 11a and a second section 11b, the first section 11a is connected to the first side 121, the second section 11b is connected to the second side 122, and the diameter d1 of the first section 11a and the diameter d2 of the second section 11b are gradually increased along a direction away from the hub 12. The volute 20 includes a volute body 21 and a volute tongue 22. The impeller assembly 10 is mounted within the volute body 21. The volute tongue 22 is spaced from the impeller assembly 10. The motor 30 is coupled to the hub 12 for driving the impeller assembly 10 in rotation.
The working area of the multi-wing centrifugal fan 100 is mainly concentrated near the hub 12, the airflow velocity in the working area is larger, the noise generated by the fan tongue 22 is larger, the airflow velocity in the area far away from the hub 12 is smaller, and the noise is smaller but the working is smaller.
According to the embodiment of the invention, the diameter d1 of the first section 11a and the diameter d2 of the second section 11b are gradually increased along the direction away from the hub 12, so that the gap between the impeller body 11 and the volute tongue 22 is gradually increased along the direction close to the hub 12, the gap between the volute tongue 22 in the area close to the hub 12 is increased, the noise is reduced, the gap between the volute tongue 22 in the area away from the hub 12 is reduced, and the work efficiency is increased.
Specifically, the multi-wing centrifugal fan 100 may be a left-handed centrifugal fan or a right-handed centrifugal fan. From the front view of one side of the motor, the impeller rotates clockwise, namely a right-handed centrifugal fan, and rotates anticlockwise, namely a left-handed centrifugal fan. In some embodiments, the multi-wing centrifugal fan 100 may be a double suction multi-wing centrifugal fan, where the double suction multi-wing centrifugal fan includes two volutes 20 and two impeller assemblies 10, and the impeller assemblies 10 are in one-to-one correspondence with the volutes 20. Preferably, the double suction multi-wing centrifugal fan includes a motor 30, and the motor 30 is disposed between the two volutes 20 and the two impeller assemblies 10. In this way, the motor 30 can simultaneously power the two impeller assemblies 10, thereby effectively saving the cost and reducing the volume of the double suction multi-wing centrifugal fan. It should be noted that the double suction multi-wing centrifugal fan has four air flow inlets and two air flow outlets, namely, two air flow inlets are formed at two ends of the impeller assembly 10, and four air flow inlets are formed at two impeller assemblies 10. It should be noted that, because the two air inlets of the double-suction multi-wing centrifugal fan near the motor 30 are blocked by the motor 30, the two air inlets of the double-suction multi-wing centrifugal fan near the motor 30 have smaller air flow than the two air inlets of the double-suction multi-wing centrifugal fan far from the motor 30. In addition, the two air flow inlets of the double-suction multi-wing centrifugal fan, which are close to the motor 30, can also be used for ventilating and radiating the motor 30, so as to play a role in reducing the temperature of the motor 30.
The first section 11a may be connected to the periphery of the first side 121, i.e. the diameter of the end of the first section 11a near the first side 121 is the same as the diameter of the first side 121; the first section 11a may also be connected to the middle of the first side 121, that is, the diameter of the end of the first section 11a near the first side 121 is smaller than the diameter of the first side 121; the first section 11a may be partially connected to the periphery of the first side 121, and the other portion is connected to the middle of the first side 121, that is, the diameter of the end of the first section 11a near the first side 121 is smaller than that of the first side 121, but the first section 11a is tangential to the periphery of the first side 121, and there are many connection positions between the first section 11a and the first side 121, which is not limited herein.
The second section 11b may be connected to the periphery of the second side 122, i.e. the diameter of the end of the second section 11b near the second side 122 is the same as the diameter of the second side 122; the second section 11b may also be connected to the middle of the second side 122, that is, the diameter of the end of the second section 11b near the second side 122 is smaller than the diameter of the second side 122; the second section 11b may be partially connected to the periphery of the second side 122, and the other portion may be connected to the middle of the second side 122, that is, the diameter of the end of the second section 11b near the second side 122 is smaller than that of the second side 122, but the second section 11b is tangential to the periphery of the second side 122, and there are many connection positions between the second section 11b and the second side 122, which are not limited herein specifically.
It should be noted that the diameter of the end of the first section 11a near the first side 121 may be the same as the diameter of the end of the second section 11b near the second side 122, and the diameter of the end of the first section 11a near the first side 121 may be different from the diameter of the end of the second section 11b near the second side 122. Preferably, the diameter of the first section 11a near the first side 121 and the diameter of the second section 11b near the second side 122 are the same, and one end of the first section 11a near the first side 121 is connected to the periphery of the first side 121, and one end of the second section 11b near the second side 122 is connected to the periphery of the second side 122.
The diameter d1 of the first segment 11a may increase equidistantly in a direction away from the hub 12, i.e. the first segment 11a is in line with the outer contour line in the same plane as the axial direction; the diameter d1 of the first segment 11a may also increase at unequal intervals along the direction away from the hub 12, that is, the outer contour line of the first segment 11a on the same plane with the axial direction may be in the shape of a concave arc, a convex arc, a wavy shape, etc., and the shape of the outer contour line of the first segment 11a on the same plane with the axial direction is various, which is not limited herein.
The diameter d2 of the second segment 11b may increase equidistantly in a direction away from the hub 12, i.e. the second segment 11b is in line with the outer contour line in the same plane as the axial direction; the diameter d2 of the second segment 11b may also increase at unequal intervals along the direction away from the hub 12, that is, the outer contour line of the second segment 11b in the same plane as the axial direction may have a concave arc, a convex arc, a wavy shape, etc., and the shape of the outer contour line of the second segment 11b in the same plane as the axial direction is various, which is not limited herein.
The shape of the outer contour line of the first segment 11a in the same plane as the axial direction may be the same as or different from the shape of the outer contour line of the second segment 11b in the same plane as the axial direction, and is not particularly limited herein.
The first segment 11a includes a plurality of first fan blades, and the number of the first fan blades may be 10, 20, 30, 40, 50, 100, etc., and the specific number thereof is adjusted according to the need and is not particularly limited herein. The first fan blade may be a forward fan blade, a backward fan blade, or a straight fan blade, which is not particularly limited herein.
The second section 11b includes a plurality of second fan blades, and the number of the second fan blades may be 10, 20, 30, 40, 50, 100, etc., and the specific number thereof is adjusted according to the need and is not particularly limited herein. The number of the second fan blades may be the same as or different from the number of the first fan blades.
The shape of the volute body 21 is various, and may be a cylinder, a truncated cone, or the like, and the shape of the volute body 21 is adapted to the shape of the impeller body 11, which is not particularly limited. The volute body 21 may include a volute plate, a side plate, a leg, etc., and the volute body 21 has a supporting and protecting function.
The volute tongue 22 is configured to prevent a portion of the gas from circulating within the volute 20, and the volute tongue 22 is spaced apart from the impeller assembly 10 to prevent the volute tongue 22 from impeding movement of the impeller assembly 10.
There are many ways to connect the motor 30 and the hub 12, for example, the hub 12 is provided with a through hole, and the output shaft of the motor 30 is matched with the through hole; for another example, the output shaft of the motor 30 is in snap fit with the hub 12; for another example, the output shaft of the motor 30 is indirectly connected to the hub 12 by being connected to the impeller body 11.
It should be noted that the foregoing examples and specific numerical values are for the convenience of description of the present invention, and should not be construed as limiting the scope of the present invention.
In some embodiments, referring to fig. 1 to 3, the motor 30 is located on the side of the second side 122, the first section 11a has a length B1, the second section 11B has a length B2, B1> B2, and B1, B2>0. The two ends along the axial direction of the impeller body 11 are air inlets of the impeller assembly 10, namely, one end of the first section 11a far away from the hub 12 and one end of the second section 11b far away from the hub 12 are both air inlets. The motor 30 is located at the side of the second side 122, which affects the air intake of the air inlet located at the second section 11b, so that the air intake of the second section 11b is smaller than that of the first section 11a without the obstruction of the fan, and thus the main supercharging region of the whole impeller body 11 is located not in the middle of the impeller body 11 but in a position closer to the motor 30 than the middle of the impeller body 11. The hub 12 is arranged in the main supercharging region of the impeller body 11, so that the diameters d2 of the first section 11a and the second section 11B in the main supercharging region are smaller, that is, the clearances between the volute tongues 22 of the first section 11a and the second section 11B in the main supercharging region are larger, and noise in the main supercharging region is effectively reduced.
Note that, the length B1 of the first section 11a means a substantial length of the first section 11a along the axial direction of the impeller body 11, that is, the lengths of the first section 11a along the axial direction of the impeller body 11 at different positions are not necessarily all equal, and B1 may be a substantial length of the first section 11a along the axial direction of the impeller body 11. The length B2 of the second section 11B means a substantial length of the second section 11B along the axial direction of the impeller body 11, that is, the lengths of the different positions of the second section 11B along the axial direction of the impeller body 11 are not necessarily all equal, and B2 may be a substantial length of the second section 11B along the axial direction of the impeller body 11.
In some embodiments, referring to fig. 3 and 4, the outer diameter of the first section 11a forms an angle a1 with the axial direction of the first section 11a, the outer diameter of the second section 11b forms an angle a2 with the axial direction of the second section 11b, a1< a2, a1 is greater than or equal to 0 ° and 0 ° < a2<10 °. If the angle of a1 or a2 is too large, the diameter d1 of the first segment 11a or the diameter d2 of the second segment 11b in the main working area is too small, so that the air volume performance of the multi-wing centrifugal fan 100 is affected. The impeller body 11 can be inclined by a certain angle by setting a1< a2, a1 more than or equal to 0 degrees and 0 degree < a2<10 degrees, and the outer diameter of a main acting area of the impeller body 11 is ensured to be smaller than the outer diameter of a hub 12, so that the gap of a volute tongue 22 of the main acting area is enlarged, and the noise of the main acting area is reduced.
The angles of a1 and a2 are various, a1 may be 0 °, 3 °, 5 °, 9 °, 9.5 °, and the like, and a2 may be 0.5 °, 2 °, 4 °, 6 °, 8 °, 9.5 °, and the like, and the angles are not particularly limited herein.
The outer diameter of the first segment 11a means an outer contour line of the first segment 11a on the same plane as the axial direction, and the outer contour line may be a straight line or a curved line, and when the outer contour line is a curved line, the outer diameter of the first segment 11a may be obtained by connecting a start point and an end point of the outer contour line, or the outer diameter of the first segment 11a may be obtained by connecting a start point and a middle point of the outer contour line, or a tangent line at a certain position of the outer contour line may be used as the outer diameter of the first segment 11a, and the outer diameter of the first segment 11a may be substantially the same as the extending direction of the outer contour line, which is not particularly limited herein.
The outer diameter of the second segment 11b means an outer contour of the second segment 11b on the same plane as the axial direction, and the outer contour may be a straight line or a curved line, and when the outer contour is a curved line, the outer diameter of the second segment 11b may be obtained by connecting a start point and an end point of the outer contour, or the outer diameter of the second segment 11b may be obtained by connecting a start point and a midpoint of the outer contour, or a tangent line at a certain point of the outer contour may be used as the outer diameter of the second segment 11b, and the outer diameter of the second segment 11b may be substantially the same as the extending direction of the outer contour, and the present invention is not limited thereto.
In some embodiments, referring to fig. 1 to 3, the diameters of the two ends of the impeller body 11 are equal, that is, the diameter of the end of the first segment 11a away from the hub 12 is equal to the diameter of the end of the second segment 11b away from the hub 12. So configured, the volute 20 is configured as a cylinder for easy production, facilitating production of the multi-wing centrifugal fan 100. Preferably, the diameter d1 of the first section 11a close to the hub 12 is the same as the diameter d2 of the second section 11b close to the hub 12, and the diameter d1 of the first section 11a far away from the hub 12 is the same as the diameter d2 of the second section 11b far away from the hub 12.
In some embodiments, referring to fig. 3, the impeller assembly 10 has a maximum outer diameter D1, the second section 11B has a length B2,0.4 x d1.ltoreq.b2.ltoreq.d1 and D1, B2>0. If the length of the second section 11b is too small, the supercharging effect of the second section 11b is poor, and a good supercharging function cannot be achieved, and if the length of the second section 11b is too large, a large swirling area is formed or backflow is generated, so that the length of the second section 11b is set in such a way that the supercharging effect is guaranteed, and meanwhile, the supercharging efficiency is considered. Similarly, the length of the first segment 11a cannot be too large or too small, and the length of B1 may also take a value within the interval 0.4×d1 to D1.
In some embodiments, referring to fig. 2 and 5, the radius of the connection between the volute tongue 22 and the volute body 21 is the radius of the volute 20, and the radius of the volute 20 gradually increases along the direction approaching the hub 12. The larger the radius of the volute tongue 22, the smaller the turning of the airflow to the volute tongue 22, so that the smaller the noise of the airflow to the volute tongue 22, the radius of the volute 20 is gradually increased along the direction approaching the hub 12, and the noise at the position approaching the hub 12 is reduced.
In some embodiments, referring to fig. 5 and 7-9, the radius of the scroll casing 20 near the motor 30 is R1, the radius of the scroll casing 20 far from the motor 30 is R2, the radius of the scroll casing 20 near the hub 12 is R3, R1< R2< R3, and R1, R2, R3>0. In the multi-wing centrifugal fan 100, the hub 12 is located in a main supercharging region of the multi-wing centrifugal fan 100, so that airflow at the hub 12 is larger, air inlet at the position far away from the motor 30 is not blocked by the fan, airflow at the position close to the motor 30 is larger, airflow at the position close to the motor 30 of the volute 20, airflow at the position far away from the fan of the volute 20 and airflow at the position close to the hub 12 of the volute 20 are sequentially increased, and accordingly the radius R1 of the volute 20 at the position close to the motor 30 of the volute 20, the radius R2 of the volute 20 at the position far away from the motor 30 of the volute 20 and the radius R3 of the volute 20 at the position close to the hub 12 are sequentially increased, so that noise of the multi-wing centrifugal fan 100 is effectively reduced.
In some embodiments, referring to FIG. 6, the volute tongue depth increases progressively in a direction away from the hub 12. The volute tongue depth is closely related to the noise of the multi-wing centrifugal fan 100, and is generally large, high in noise but good in aerodynamic performance, and conversely, low in noise. The volute tongue depth beta 1 close to the hub 12 is smaller, so that noise at the position is effectively reduced, and the volute tongue depth beta 2 far away from the hub 12 is larger, so that aerodynamic performance at the position is effectively improved.
It should be noted that a small volute tongue depth β1 near the hub 12 means that the position near the hub 12 is a shallow tongue, and a large volute tongue depth β2 away from the hub 12 means that the position away from the hub 12 is a deep tongue. The criteria for the deep tongue and the shallow tongue are not fixed, so long as the position close to the hub 12 is guaranteed to be greater than the volute tongue depth at the position far from the hub 12.
It should be added that the volute tongue depth is the angle between the straight line passing through the center of the impeller assembly 10 and the straight line passing through the center of the volute tongue 22 and the center of the impeller assembly 10, and the straight line passing through the center of the impeller assembly 10 is usually a straight line extending in the vertical direction or extending in the horizontal direction. The forward direction of the tongue depth is the reverse direction of the rotation direction of the impeller assembly 10, i.e., the more the tongue 22 extends in the reverse direction of the rotation direction of the impeller assembly 10 with reference to a straight line passing through the center of the impeller assembly 10, the greater the tongue depth, and vice versa.
In some embodiments, referring to fig. 2 and 3, the impeller assembly 10 further includes a stiffener 13, and the stiffener 13 is mounted to the impeller body 11. The reinforcing ribs 13 are used for fixing the impeller body 11 and reinforcing the structural stability of the impeller body 11. The reinforcing rib 13 may extend along the circumferential direction of the impeller body 11, and the reinforcing rib 13 may extend at an angle to the circumferential direction of the impeller body 11, for example, the reinforcing rib 13 may be at an angle of 5 °, 10 °, 15 °, 20 °, 30 °, 40 ° or the like to the circumferential direction of the impeller body 11, which is not particularly limited.
The impeller assembly 10 may include one reinforcing rib 13, or may include a plurality of reinforcing ribs 13, for example, 2, 3, 4, etc., and the extending directions of the plurality of reinforcing ribs 13 may be different, the extending directions of the plurality of reinforcing ribs 13 may be the same, and the plurality of reinforcing ribs 13 may intersect or be spaced apart from each other, so long as the reinforcing ribs 13 may play a role of reinforcing the structural stability of the impeller body 11, which is not particularly limited herein.
In the illustrated embodiment, since the first segment 11a is longer than the second segment 11b, the reinforcing rib 13 connects the circumferential side surfaces of the first segment 11a in the middle of the first segment 11a in 360 degrees along the circumferential direction of the first segment 11a, on the one hand, the structural strength of the first segment 11a can be ensured, and on the other hand, the reinforcing rib 13 does not cause additional vibration to the rotational stability of the first segment 11a in the axial direction and the radial direction.
The embodiment of the invention also discloses a household appliance, in particular to household appliances including but not limited to oil smoke equipment, integrated stoves and other appliances with oil smoke exhaust energy supply, blowers, dust collectors and other appliances with multi-wing centrifugal fans 100. The domestic appliance is taken as an oil smoke device for illustration. The household appliance may be an upper kitchen appliance, a lower kitchen appliance, or a side kitchen appliance, which is not particularly limited herein.
Specifically, the household appliance comprises a multi-wing centrifugal fan 100, and further comprises a box body, a guide plate, a check valve and other components, wherein the guide plate, the multi-wing centrifugal fan 100 and the check valve are all arranged on the box body, oil smoke enters the box body through the guide plate, the multi-wing centrifugal fan 100 arranged in the box body works, the oil smoke is sucked into the multi-wing centrifugal fan 100 under the centrifugal force action of the multi-wing centrifugal fan 100 and is discharged from an air flow outlet of the multi-wing centrifugal fan 100 to enter the check valve, and the check valve prevents the oil smoke from flowing back to the multi-wing centrifugal fan 100, so that the oil smoke is discharged. It is understood that the check valve is a valve in which the opening and closing member is a circular valve flap and acts against its own weight and the pressure of the medium to block the backflow of the medium. The check valve may be a lift check valve or a swing check valve.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (8)

1. A multi-wing centrifugal fan, comprising:
the impeller assembly comprises an impeller body and a hub, wherein the hub comprises a first side surface and a second side surface which are opposite to each other, the impeller body comprises a first section and a second section, the first section is connected to the first side surface, the second section is connected to the second side surface, and the diameters of the first section and the second section are gradually increased along the direction away from the hub;
the volute comprises a volute body and a volute tongue, the impeller assembly is arranged in the volute body, and the volute tongue is spaced from the impeller assembly;
the motor is connected with the hub and used for driving the impeller assembly to rotate;
the radius of the volute where the volute is close to the motor is R1, the radius of the volute where the volute is far away from the motor is R2, the radius of the volute where the volute is close to the hub is R3, R1< R2< R3, and R1, R2 and R3 are more than 0;
the maximum outer diameter of the impeller assembly is D1, the length of the second section is B2, D1 is more than or equal to 0.4 and less than or equal to B2 and less than or equal to D1, and D1 and B2 are more than 0.
2. The multi-wing centrifugal fan of claim 1, wherein the motor is located on a side of the second side, the first section has a length B1, the second section has a length B2, B1> B2, and B1, B2>0.
3. The multi-wing centrifugal fan according to claim 2, wherein an angle between an outer diameter of the first section and an axial direction of the first section is a1, an angle between an outer diameter of the second section and an axial direction of the second section is a2, a1< a2, a1 is equal to or greater than 0 ° and 0 ° < a2<10 °.
4. The multi-wing centrifugal fan of claim 1, wherein the diameters of both ends of the impeller body are equal.
5. The multi-wing centrifugal fan of claim 1, wherein a radius of a junction of the volute tongue and the volute body is a volute radius, the volute radius gradually increasing in a direction approaching the hub.
6. The multi-wing centrifugal fan of claim 1, wherein the volute tongue depth increases progressively in a direction away from the hub.
7. The multi-wing centrifugal fan of claim 1, wherein the impeller assembly further comprises a stiffener mounted to the impeller body.
8. A household appliance comprising a multi-wing centrifugal fan as claimed in any one of claims 1 to 7.
CN202110605278.1A 2020-12-31 2021-05-31 Multi-wing centrifugal fan and household appliance Active CN113309714B (en)

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WO2022143328A1 (en) * 2020-12-31 2022-07-07 广东美的厨房电器制造有限公司 Centrifugal fan, household appliance, volute, and cooking utensil

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