US20230332604A1 - Fan Assembly and Vacuum Cleaner - Google Patents

Fan Assembly and Vacuum Cleaner Download PDF

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Publication number
US20230332604A1
US20230332604A1 US18/212,508 US202318212508A US2023332604A1 US 20230332604 A1 US20230332604 A1 US 20230332604A1 US 202318212508 A US202318212508 A US 202318212508A US 2023332604 A1 US2023332604 A1 US 2023332604A1
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US
United States
Prior art keywords
impeller
fan assembly
passage
rotation shaft
backflow
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.)
Pending
Application number
US18/212,508
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English (en)
Inventor
Jie QIN
Xiaowen Hu
Site HU
Zhenjie Zeng
Longxin ZHANG
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 White Goods Technology Innovation Center Co Ltd
Original Assignee
Midea Group Co Ltd
Guangdong Midea White Goods Technology Innovation Center Co Ltd
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Publication date
Application filed by Midea Group Co Ltd, Guangdong Midea White Goods Technology Innovation Center Co Ltd filed Critical Midea Group Co Ltd
Publication of US20230332604A1 publication Critical patent/US20230332604A1/en
Assigned to GUANGDONG MIDEA WHITE HOME APPLIANCE TECHNOLOGY INNOVATION CENTER CO., LTD., MIDEA GROUP CO., LTD. reassignment GUANGDONG MIDEA WHITE HOME APPLIANCE TECHNOLOGY INNOVATION CENTER CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HU, Site, HU, XIAOWEN, QIN, Jie, ZENG, Zhenjie, ZHANG, Longxin
Pending legal-status Critical Current

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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
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/12—Multi-stage pumps
    • F04D17/122—Multi-stage pumps the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/08—Multi-stage pumps the stages being situated concentrically
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L5/00—Structural features of suction cleaners
    • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
    • A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/22—Mountings for motor fan assemblies
    • 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
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • 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
    • F04D29/444—Bladed 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
    • F04D29/66—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

Definitions

  • the disclosure relates to the technical field of household appliances, and in particular to a fan assembly and a vacuum cleaner.
  • Vacuum cleaners are gradually favored by consumers due to their advantages such as small sizes, light weights, usage convenience, or the like. Improving suction of the vacuum cleaners by increasing rotation speeds or sizes of fans of the vacuum cleaners may cause an increase in noise and volume of the vacuum cleaners.
  • a first aspect of the disclosure provides a fan assembly.
  • a second aspect of the disclosure provides a vacuum cleaner.
  • the first aspect of the disclosure provides a fan assembly, including a shell, a rotation shaft, a first impeller, a diffuser and a second impeller.
  • the shell includes an air inlet and an air outlet in communication with each other.
  • the rotation shaft is arranged in the shell and extends from the air inlet to the air outlet.
  • the first impeller is arranged on the rotation shaft and located at a side of the air inlet.
  • the diffuser is arranged in the shell and located at a side of the air outlet.
  • the second impeller is arranged on the rotation shaft and located between the first impeller and the diffuser.
  • the fan assembly provided in the disclosure includes a shell, a rotation shaft, a first impeller, a diffuser and a second impeller.
  • the shell includes an air inlet and an air outlet in communication with each other.
  • the rotation shaft is arranged in the shell and extends from the air inlet to the air outlet.
  • the first impeller and the second impeller are sequentially arranged on the rotation shaft in a direction from the air inlet to the air outlet, and the first impeller, the second impeller may be used in cooperation with the diffuser to drive a gas to go into the shell from the air inlet and go out from the air outlet.
  • the rotation shaft is driven to drive the first impeller and the second impeller to rotate.
  • the first impeller rotates at the air inlet, thereby sucking an external gas into the shell from the air inlet and driving the gas to flow towards the second impeller.
  • the gas After the gas flows to the second impeller, the gas further flows to the diffuser under the drive of the second impeller.
  • two-stage driving of the gas is achieved through cooperation of the first impeller and the second impeller, which may improve an air supply capacity of the fan assembly on one hand and may reduce working noise of the fan assembly on the other hand.
  • the second impeller drives the gas to the diffuser, so that airflow is blown out from the air outlet after it is diffused by the diffuser.
  • radial sizes of the first impeller and the second impeller may be reduced while still ensuring the air supply capacity of the fan assembly, thereby reducing a radial size of the fan assembly itself and achieving miniaturization and compact design of structure of the fan assembly.
  • the fan assembly provided in the disclosure may reduce working noise of the fan assembly while ensuring the air supply capacity of the fan assembly through cooperation of the first impeller and the second impeller, and may reduce the radial size of the fan assembly through design of the diffuser.
  • the radial size of the fan assembly does not increase while ensuring that the fan assembly achieves air supply through two-stage impellers, so that the radial size of the fan assembly provided in the disclosure is similar to that of a fan assembly with a single impeller, and gas flow efficiency may also improve.
  • the second aspect of the disclosure provides a vacuum cleaner, including the fan assembly according to the first aspect of the disclosure.
  • the vacuum cleaner provided in the disclosure includes the fan assembly according to the first aspect of the disclosure.
  • the vacuum cleaner provided in the disclosure may be a hand-held vacuum cleaner, has structural characteristics of miniaturization, and may be convenient for users to use it.
  • FIG. 1 is a schematic structural diagram of a fan assembly according to some embodiments of the disclosure.
  • FIG. 2 is a cross-sectional view of the fan assembly of some embodiments shown in FIG. 1 ;
  • FIG. 3 is a partial schematic diagram of some embodiments shown in FIG. 2 ;
  • FIG. 4 is a partial schematic diagram of some embodiments shown in FIG. 2 ;
  • FIG. 5 is a partial schematic diagram of some embodiments shown in FIG. 2 ;
  • FIG. 6 is a schematic structural diagram of a backflow structure in the fan assembly of some embodiments shown in FIG. 1 ;
  • FIG. 7 is a partial schematic diagram of some embodiments shown in FIG. 2 ;
  • FIG. 8 is a schematic diagram of performance comparison between the fan assembly provided in the disclosure and a fan assembly provided in the related art.
  • FIG. 2 indicate gas flow direction
  • a solid line in FIG. 8 indicates relevant data of the fan assembly provided in the disclosure
  • a dotted line in FIG. 8 indicates test data of a fan assembly in the related art.
  • some embodiments of a first aspect of the disclosure provide a fan assembly, including a shell 100 , a rotation shaft 200 , a first impeller 300 , a diffuser 400 and a second impeller 500 .
  • the shell 100 includes an air inlet 110 and an air outlet 112 in communication with (e.g., in fluidic communication with) each other.
  • the rotation shaft 200 is arranged in the shell 100 and extends from the air inlet 110 to the air outlet 112 .
  • the first impeller 300 is arranged on the rotation shaft 200 and located at a side of the air inlet 110 .
  • the diffuser 400 is arranged in the shell 100 and located at a side of the air outlet 112 .
  • the second impeller 500 is arranged on the rotation shaft 200 and located between the first impeller 300 and the diffuser 400 .
  • the fan assembly provided in the embodiments includes a shell 100 , a rotation shaft 200 , a first impeller 300 , a diffuser 400 and a second impeller 500 .
  • the shell 100 includes an air inlet 110 and an air outlet 112 in communication with each other.
  • the rotation shaft 200 is arranged in the shell 100 and extends from the air inlet 110 to the air outlet 112 .
  • the first impeller 300 and the second impeller 500 are sequentially arranged on the rotation shaft 200 in a direction from the air inlet 110 to the air outlet 112 , and the first impeller 300 , the second impeller 500 may be used in cooperation with the diffuser 400 to drive a gas to go into the shell 100 from the air inlet 110 and go out from the air outlet 112 .
  • the rotation shaft 200 is driven to drive the first impeller 300 and the second impeller 500 to rotate.
  • the first impeller 300 rotates at the air inlet 110 , thereby sucking an external gas into the shell 100 from the air inlet 110 and driving the gas to flow towards the second impeller 500 .
  • the gas further flows to the diffuser 400 under the drive of the second impeller 500 .
  • two-stage driving of the gas is achieved through cooperation of the first impeller 300 and the second impeller 500 , which may improve an air supply capacity of the fan assembly on one hand and may reduce working noise of the fan assembly on the other hand.
  • the second impeller 500 drives the gas to the diffuser 400 , so that airflow is blown out from the air outlet 112 after it is diffused by the diffuser 400 .
  • radial sizes of the first impeller 300 and the second impeller 500 may be greatly reduced in case of ensuring the air supply capacity of the fan assembly, thereby reducing a radial size of the fan assembly itself and achieving miniaturization and compact design of structure of the fan assembly.
  • the fan assembly provided in the disclosure may effectively reduce working noise of the fan assembly while ensuring the air supply capacity of the fan assembly through cooperation of the first impeller and the second impeller 500 , and may greatly reduce the radial size of the fan assembly through design of the diffuser 400 .
  • the radial size of the fan assembly may not increase while ensuring that the fan assembly may achieve air supply through two-stage impellers, so that the radial size of the fan assembly provided in the disclosure is similar to that of a fan assembly with a single impeller, and gas flow efficiency may be improved.
  • the fan assembly further includes a flow guidance passage 600 .
  • the flow guidance passage 600 is provided with two ends in communication with an outlet end of the first impeller 300 and an inlet end of the second impeller 500 respectively, and diameter of at least a part of the flow guidance passage 600 gradually increases in the gas flow direction.
  • the fan assembly further includes a flow guidance passage 600 .
  • the flow guidance passage 600 is arranged inside the shell 100 , an inlet of the flow guidance passage 600 is in communication with the outlet end of the first impeller 300 , and an outlet of the flow guidance passage 600 is in communication with the inlet end of the second impeller 500 , thereby playing a role of guiding flow between the first impeller 300 and the second impeller 500 and reducing airflow loss.
  • the diameter of at least a part of the flow guidance passage 600 gradually increases in the gas flow direction. That is, during operation of the fan assembly, airflow entering interior of a flow guidance structure 800 passes through a segment of the flow guidance passage 600 with a gradually increasing diameter. When airflow passes through the part of the flow guidance passage 600 with a gradually increasing diameter, an effect of deceleration and pressurization may be achieved, and noise when the gas flows through the part of the flow guidance passage 600 may be reduced, and airflow pressure may be ensured.
  • the flow guidance passage 600 includes a diffusion passage 602 and a backflow passage 604 .
  • the diffusion passage 602 is in communication with the outlet end of the first impeller 300 .
  • the backflow passage 604 is in communication with the diffusion passage 602 and the inlet end of the second impeller 500 . Diameter of the diffusion passage 602 gradually increases in a gas flow direction.
  • the flow guidance passage 600 includes a diffusion passage 602 and a backflow passage 604 in communication with each other.
  • the diffusion passage 602 is in communication with the outlet end of the first impeller 300 .
  • the backflow passage 604 is in communication with the diffusion passage 602 and the inlet end of the second impeller 500 .
  • FIG. 3 shows that during operation of the fan assembly, airflow is driven by the first impeller 300 , enters the diffusion passage 602 of the flow guidance passage 600 first, then passes through the backflow passage 604 of the flow guidance passage 600 , and flows towards the second impeller 500 .
  • the diameter of the diffusion passage 602 gradually increases in the gas flow direction. That is, when the gas flows in the diffusion passage 602 , a flow speed of the gas decreases and air pressure inside the diffusion passage 602 increases. According to this design, a radial size of the first impeller 300 may be effectively reduced in case of ensuring the same air supply volume, thereby achieving compactness and miniaturization of structure of the fan assembly.
  • the diffusion passage 602 , the backflow passage 604 and the diffuser 400 used in the embodiments are used in cooperation, which may greatly reduce the radial size of the fan assembly, and the radial size of the fan assembly is reduced by 20% compared to a radial size of a fan assembly of a traditional two-stage vacuum cleaner, is equivalent to a radial size of a fan assembly of a single-stage vacuum cleaner, and may improve aerodynamic efficiency compared to the single-stage vacuum cleaner.
  • the first impeller 300 is a centrifugal impeller
  • the diffusion passage 602 includes at least one bend and is located at both sides of the first impeller 300
  • the backflow passage 604 is located between the first impeller 300 and the second impeller 500 .
  • the first impeller 300 is a centrifugal impeller
  • the diffusion passage 602 includes at least one bend.
  • an axial direction of the first impeller 300 is arranged towards the air inlet 110 , so that a radial direction of the first impeller 300 is used as the outlet end.
  • the bend of the diffusion passage 602 is located at a peripheral side of the first impeller 300 , thereby ensuring that the diffusion passage 602 is located at both sides of the first impeller 300 and is in communication with the air inlet 110 and the second impeller 500 at both sides of the first impeller 300 .
  • the diameter of the diffusion passage 602 in the gas flow direction gradually increases, and the diffusion passage 602 itself is configured with bend.
  • the diffusion passage 602 integrates diffusion and bending functions together, so that airflow in the diffusion passage 602 may be decelerated and pressurized while turning, thereby reducing the radial size of the first impeller 300 .
  • the fan assembly further includes a backflow structure 700 .
  • the backflow structure 700 is arranged in the shell 100 and located between the first impeller 300 and the second impeller 500 .
  • the fan assembly further includes a backflow structure 700 .
  • the backflow structure 700 is arranged in the shell 100 and located between the first impeller 300 and the second impeller 500 .
  • the backflow structure 700 is used in cooperation with the first impeller 300 , thereby allowing the gas to flow from the first impeller 300 to the backflow structure 700 .
  • the backflow structure 700 is sleeved on the rotation shaft 200 , and plays a role of back flowing the gas blown out radially from the first impeller 300 , thereby changing a flow direction of the gas blown out radially from the first impeller 300 , so that a part of the gas flows to the second impeller 500 .
  • the backflow structure 700 is used in cooperation with the first impeller 300 , so that the backflow structure 700 plays a good role of guiding flow and backflow, and then allowing the gas flows from the first impeller 300 to the second impeller 500 .
  • the backflow structure 700 includes a backflow disk 702 and a guide blade 704 .
  • the backflow disk 702 is sleeved on the rotation shaft 200 and has a gap with respect to the rotation shaft 200 , and the flow guidance passage 600 is formed between the backflow disk 702 and an inner wall of the shell 100 .
  • the guide blade 704 is arranged on the backflow disk 702 and at least partially located in the backflow passage 604 .
  • the gas enters the flow guidance passage 600 under the drive of the first impeller 300 and flows to the second impeller 500 under a guidance action of the guide blade 704 , thereby playing a role of the backflow structure 700 performing good rectification and removing rotation.
  • multiple guide blades 704 are provided and extend spirally along an outer periphery of the backflow disk 702 .
  • the first impeller 300 sucks gas in the axial direction and blows out gas in the radial direction, the gas blown out from the first impeller 300 flows towards the inner wall of the shell 100 , and the flow direction of the gas blown out from the first impeller 300 is changed through design of the backflow structure 700 , especially by cooperation of the flow guidance passage 600 and the guide blade 704 , so that the part of airflow flows towards the second impeller 500 .
  • the backflow disk 702 does not rotate along with the rotation shaft 200 during operation of the fan assembly, the gas blown out from the first impeller 300 has a certain rotation direction itself, and the gas flows in a gap between two adjacent guide blades 704 through design of the guide blades 704 , which further plays a role of removing rotation, ensures that the gas smoothly blows to the second impeller 500 , avoids phenomenon such as vortex of the gas or the like in a process of the gas flowing to the second impeller 500 , and further avoids unnecessary noise generated inside the fan assembly.
  • a containing groove 706 is arranged at an end surface of the backflow disk 702 facing the air inlet 110 , and a first turntable 302 of the first impeller 300 is at least partially accommodated in the containing groove 706 , thereby ensuring that the first turntable 302 is arranged to be flush with a part of the backflow disk 702 where the containing groove 706 is not arranged, so that a first guidance hood 306 of the first impeller 300 is arranged to be flush with interior of the shell 100 .
  • each of the first turntable 302 and the first guidance hood 306 is tangent to an inner wall of the flow guidance passage 600 , and airflow is not subjected to resistance when the airflow enters interior of the flow guidance passage 600 from the first impeller 300 .
  • a radial end surface of the backflow disk 702 is a first arc line 710
  • a part of the inner wall of the shell 100 forming the diffusion passage 602 is a second arc line 114
  • a distance between a first circle center O 1 of the first arc line 710 and an axial end surface of the first impeller 300 facing the backflow structure 700 is L1
  • a distance between a first circle center O 2 of the second arc line 114 and an axial end surface of the first impeller 300 facing the backflow structure 700 is L2.
  • a radial end surface of the backflow disk 702 is a first arc line 710
  • a part of the inner wall of the shell 100 forming the diffusion passage 602 is a second arc line 114 .
  • a diameter of the first arc line 710 is less than that of the second arc line 114
  • a distance between a first circle center O 1 of the first arc line 710 and an axial end surface of the first impeller 300 facing the backflow structure 700 is L1
  • a distance between a first circle center O 2 of the second arc line 114 and an axial end surface of the first impeller 300 facing the backflow structure 700 is L2, and they satisfy L1 ⁇ L2.
  • this design ensures that a distance between the first arc line 710 and the second arc line 114 gradually increases in the gas flow direction, that is, it ensures that the diameter of the diffusion passage 602 gradually increases, thereby ensuring that the diffusion passage 602 achieves an effect of deceleration and pressurization on airflow, and reducing the radial size of the first impeller 300 .
  • L1 is a distance between the first circle center O 1 and an end surface of the first turntable 302 where a first blade 304 is arranged
  • L2 is a distance between the second circle center O 2 and the end surface of the first turntable 302 where the first blade 304 is arranged.
  • a distance between a first circle center O 1 and an axial end surface of the first impeller 300 facing the backflow structure 700 is L1
  • a distance between a second circle center O 2 and an axial end surface of the first impeller 300 facing the backflow structure 700 is L2, and they satisfy 2% (L1-L2)/L1 7%.
  • a ratio of a distance L1-L2 between the first circle center O 1 and the second circle center O 2 to the distance L1 between the first circle center O 1 and the axial end surface of the first impeller 300 facing the backflow structure 700 is greater than or equal to 2% and less than or equal to 7%. That is, 2% ⁇ (L1-L2)/L1 ⁇ 7%.
  • the diffusion passage 602 By reasonably designing a positional relationship between the first arc line 710 and the second arc line 114 , and variation trend and variation amplitude of the diameter of the diffusion passage 602 , it may ensure that the diffusion passage 602 achieves an effect of diffusion and deceleration on airflow, and flow velocity and pressure of airflow in the diffusion passage 602 may be matched with each other, thereby achieving the best effect of diffusion and deceleration, and ensuring an air supply capacity of the first impeller 300 while ensuring the radial size of the first impeller 300 .
  • (L1-L2)/L1 may take values of 2%, 3%, 4%, 5%, 6%, 7%, etc., which are not specifically limited here. It may be understood by those skilled in the art that any value may be taken, as long as the value ensures the diffusion effect of the diffusion passage 602 on airflow.
  • a part of an end surface of the backflow disk 702 forming the backflow passage 604 is a first straight line 712
  • a part of the inner wall of the shell 100 forming the backflow passage 604 is a second straight line 116
  • the first straight line 712 is parallel to the second straight line 116 and extends in a radial direction of the rotation shaft 200 .
  • a part of an end surface of the backflow disk 702 forming the backflow passage 604 is a first straight line 712
  • a part of the inner wall of the shell 100 forming the backflow passage 604 is a second straight line 116
  • the first straight line 712 is arranged to be parallel to the second straight line 116 and extend in a direction towards the rotation shaft 200 . According to this design, it ensures that inner walls of the backflow passage 604 are designed in parallel, so that the backflow passage 604 is in cooperation with the guide blades 704 of the backflow structure 700 , to achieve an effect of performing rectification and removing rotation on airflow.
  • the gas blown out from the first impeller 300 still has a certain rotation direction after entering the backflow passage 604 through the diffusion passage 602 , however, the inner walls of the backflow passage 604 are arranged in parallel and in cooperation with the guide blades 704 to work together, to make airflow flow through the gap between two adjacent guide blades 704 , thereby playing a certain role of performing adjustment and removing rotation on the airflow, and ensuring that the gas smoothly blows to the second impeller.
  • the first impeller 300 includes a first turntable 302 , a first blade 304 and a first guidance hood 306 .
  • the first turntable 302 is arranged on the rotation shaft 200 .
  • the first blade 304 is arranged on an end surface of the first turntable 302 facing the air inlet 110 .
  • the first guidance hood 306 is connected to the first blade 304 , and the first blade 304 is located between the first turntable 302 and the first guidance hood 306 .
  • a distance L3 between an outer edge of the first guidance hood 306 and an axis of the first impeller 300 is greater than a distance L4 between an outer edge of the first turntable 302 and the axis of the first impeller 300 .
  • the first impeller 300 is a centrifugal impeller and includes a first turntable 302 , a first blade 304 and a first guidance hood 306 .
  • the first turntable 302 is arranged on the rotation shaft 200 and may drive the first blade 304 to rotate under the drive of the rotation shaft 200 .
  • the first guidance hood 306 and the first turntable 302 are located on both sides of the first blade 304 and may play a role of guiding flow during operation, thereby reducing loss of airflow under an action of the first impeller 300 .
  • the gas enters interior of the first impeller 300 in the axial direction under the drive of the first blade 304 , and is blown out in the radial direction with guidance of the first guidance hood 306 and the first turntable 302 .
  • a distance between an outer edge of the first guidance hood 306 and an axis of the first impeller 300 is L3
  • a distance between an outer edge of the first turntable 302 and the axis of the first impeller 300 is L4
  • they satisfy L3 > L4 That is, at a position of the outlet end of the first impeller 300 in the radial direction, a size of the first guidance hood 306 is longer than that of the first turntable 302 .
  • this design may control airflow to be blown out more evenly and smoothly from the first impeller 300 , and may ensure that the airflow blown out from the first impeller 300 has an included angle with respect to the rotation shaft 200 itself, the airflow blown out from the first impeller 300 smoothly enters the flow guidance passage 600 , and flow loss and noise generated when the airflow turns in the flow guidance passage 600 are minimum.
  • the air supply capacity of the fan assembly is ensured on one hand, and noise and loss of the airflow in the flow guidance passage 600 are reduced on the other hand.
  • the second impeller 500 includes a second turntable 502 , a second blade 504 and a second guidance hood 506 .
  • the second turntable 502 is arranged on the rotation shaft 200 .
  • the second blade 504 is arranged on an end surface of the second turntable 502 facing the first impeller 300 .
  • the second guidance hood 506 is connected to the second blade 504 , and the second blade 504 is located between the second turntable 502 and the second guidance hood 506 .
  • a distance L5 between an outer edge of the second guidance hood 506 and an axis of the second impeller 500 is greater than a distance L6 between an outer edge of the second turntable 502 and the axis of the second impeller 500 .
  • the second impeller 500 is a centrifugal impeller and includes a second turntable 502 , a second blade 504 and a second guidance hood 506 .
  • the second turntable 502 is arranged on the rotation shaft 200 and may drive the second blade 504 to rotate under the drive of the rotation shaft 200 .
  • the second guidance hood 506 and the second turntable 502 are located on both sides of the second blade 504 and may play a role of guiding flow during operation, thereby reducing loss of airflow under an action of the second impeller 500 .
  • the gas enters interior of the second impeller 500 in the axial direction under the drive of the second blade 504 , and is blown out in the radial direction with guidance of the second guidance hood 506 and the second turntable 502 .
  • a distance between an outer edge of the second guidance hood 506 and an axis of the second impeller 500 is L5
  • a distance between an outer edge of the second turntable 502 and the axis of the second impeller 500 is L6, and they satisfy L5 > L6. That is, at a position of the outlet end of the second impeller 500 in the radial direction, a size of the second guidance hood 506 is longer than that of the second turntable 502 .
  • this design may control airflow to be blown out more evenly and smoothly from the second impeller 500 , and may ensure that the airflow blown out from the second impeller 500 has an included angle with respect to the rotation shaft 200 itself, the airflow blown out from the second impeller 500 smoothly enters the diffuser 400 , and flow loss and noise generated when the airflow turns are minimum.
  • the air supply capacity of the fan assembly is ensured on one hand, and noise and loss of the airflow in the flow guidance passage 600 are reduced on the other hand.
  • a straight line where an extension line of a radial edge of the second turntable 502 is located intersects with an axis of the rotation shaft 200 to form an included angle ⁇ which is greater than or equal to 80° and less than or equal to 89°, and the included angle ⁇ is located between the second turntable 502 and the air outlet 112 .
  • a straight line where an extension line of a radial edge of the second turntable 502 is located forms an included angle ⁇ with an axis of the rotation shaft 200
  • the included angle ⁇ is located between the second turntable 502 and the air outlet 112 and is greater than or equal to 80° and less than or equal to 89°, that is, satisfies 80° ⁇ ⁇ ⁇ 89°. According to this design, it ensures that airflow is inclined relative to the rotation shaft 200 after it is blown out from the outlet end of the second impeller 500 , and the airflow may smoothly transition into the diffuser 400 , thereby reducing airflow loss and airflow noise.
  • values taken by the included angle ⁇ are not specifically limited, and may be 80°, 81°, 82°, 83°, 84°, 85°, 86°, 87°, 88°, 89°, etc. It may be understood by those skilled in the art that any value may be taken, as long as the value may improve aerodynamic efficiency of the whole machine.
  • the fan assembly further includes a flow guidance structure 800 .
  • the flow guidance structure 800 is arranged on the rotation shaft 200 , a flow-past passage 900 is formed between the flow guidance structure 800 and an inner wall of the shell 100 and is in communication with an outlet end of the flow guidance passage 600 and the inlet end of the second impeller 500 .
  • the fan assembly further includes a flow guidance structure 800 .
  • the flow guidance structure 800 is arranged on the rotation shaft 200 and located in the shell 100 .
  • a flow-past passage 900 is formed between the flow guidance structure 800 and an inner wall of the shell 100 , and both ends of the flow-past passage 900 are in communication with an outlet end of the flow guidance passage 600 and the inlet end of the second impeller 500 respectively.
  • both ends of the flow guidance structure 800 are connected to the backflow disk 702 and the second impeller 500 respectively in the outflow direction of the flow-past passage 900 , and the diameter of the flow guidance structure 800 is ensured to decrease first and then increase.
  • the diffuser 400 is an axial flow diffuser and includes at least one group of diffusion blades 402 , and any group of diffusion blades 402 is distributed in an annular shape.
  • the diffuser is configured as an axial flow diffuser.
  • the diffuser 400 includes at least one group of diffusion blades 402 , and any group of diffusion blades is distributed in an annular shape at the air outlet. According to this design, it ensures that the axial flow diffuser greatly reduces radial sizes of the first impeller and the second impeller on one hand, and ensures air supply efficiency of the fan assembly on the other hand. Furthermore, the axial flow diffuser may be used instead of a radial diffuser, thereby reducing the radial size of the fan assembly.
  • the diffuser 400 includes multiple groups of diffusion blades.
  • a number of the diffusion blades 402 gradually increases in a gas flow direction; and/or rotation angles of the diffusion blades 402 gradually decreases in the gas flow direction.
  • the diffuser 400 includes multiple groups of diffusion blades 402 , and multiple groups of diffusion blades 402 are arranged at intervals in the gas flow direction.
  • the number of the diffusion blades 402 in each group gradually increases and rotation angles of the diffusion blades 402 in each group gradually decreases.
  • the diffusion blades 402 of the diffuser 400 may cooperate with each other to ensure a diffusion effect on airflow.
  • the axial flow diffuser including multiple groups of diffusion blades 402 may be used instead of the radial diffuser, thereby reducing the radial size of the fan assembly.
  • the diffusion blade 402 is a ternary blade.
  • the diffusion blade 402 is a ternary blade.
  • multiple diffusion blades 402 may be used in cooperation, and may be used instead of the radial diffuser, thereby reducing the radial size of the fan assembly.
  • the shell 100 includes a first mounting segment 102 , a second mounting segment 104 and a transition segment 106 .
  • the first impeller 300 is located in the first mounting segment 102 .
  • the second impeller 500 and the diffuser 400 are located in the second mounting segment 104 .
  • the transition segment 106 is arranged to be connected to the first mounting segment 102 and the second mounting segment 104 .
  • the shell 100 includes a first mounting segment 102 a second mounting segment 104 and a transition segment 106 which are connected.
  • the air inlet 110 is arranged on an axial end surface of the first mounting segment 102
  • the first impeller 300 is arranged in the first mounting segment 102 .
  • the air outlet 112 is arranged at an axial end surface of the second mounting segment 104
  • the second impeller 500 is arranged in the second mounting segment 104 .
  • the transition segment 106 is arranged between the first mounting segment 102 and the second mounting segment 104 , and connected to both the first mounting segment 102 and the second mounting segment 104 .
  • the flow-past passage 900 is formed between the flow guidance structure 800 and an inner wall of the transition segment 106
  • the flow guidance passage 600 is formed between a part of an inner wall of the first mounting segment 102 and the backflow disk 702 of the backflow structure 700 .
  • the transition segment 106 is arranged to be recessed towards the rotation shaft 200 .
  • the shell 100 further includes fins 108 , and the fins 108 are arranged on the transition segment 106 and connected to the first mounting segment 102 and the second mounting segment 104 .
  • the fan assembly further includes fins 108 .
  • the transition segment 106 is arranged to be recessed towards the rotation shaft 200 , and the fins 108 are arranged on an outer wall of the shell 100 , located at a position of the transition segment 106 and connected to both the first mounting segment 102 and the second mounting segment 104 .
  • a heat dissipation area of the fan assembly is effectively increased through arrangement of the fins 108 , thereby achieving a purpose of rapid cooling of the fan assembly.
  • the fins 108 are made of an easily thermal-conductive metal material, located between the first impeller 300 and the second impeller 500 , and seamlessly connected to the outer wall of the shell 100 . Specifically, multiple fins 108 are provided and distributed in an axial direction of the rotation shaft 200 .
  • the rotation shaft 200 is provided with a thread
  • the fan assembly further includes a nut 202
  • the nut 202 is mounted on the thread to fix the first impeller 300 .
  • the fan assembly further includes a nut 202 .
  • the rotation shaft 200 is provided with a thread, and installation of the first impeller 300 is achieved by cooperation of the nut 202 and the thread on the rotation shaft 200 . Furthermore, a rotation direction of the nut 202 is opposite to that of the rotation shaft 200 , to ensure that the first impeller 300 does not fall off during operation of the fan assembly.
  • the fan assembly further includes a driving member 204 , and the driving member 204 is connected to the rotation shaft 200 and configured to drive the rotation shaft 200 to rotate.
  • the fan assembly further includes a driving member 204 , and the driving member 204 is connected to the rotation shaft 200 and may drive a rotational operation during operation, thereby allowing the first impeller 300 , the second impeller 500 and the diffuser 400 to operate to drive the gas.
  • the driving member 204 may use a motor, and the diffuser 400 is arranged on an outer periphery of the driving member 204 .
  • gas flow process is as follows.
  • the rotation shaft 200 operates, to drive the first impeller 300 and the second impeller 500 arranged on the rotation shaft 200 to rotate.
  • the first impeller 300 rotates to drive the gas outside the shell 100 to enter the shell 100 through the air inlet 110 , then the gas part enters the flow guidance passage 600 under the drive of the shell 100 , and then passes through the diffusion passage 602 and the backflow passage 604 sequentially. Then, the gas part flows to the flow-past passage 900 with guidance of the guide blade 704 , and flows to the second impeller 500 with guidance of the flow-past passage 900 .
  • the second impeller 500 continues to drive the gas to flow to the diffuser 400 , and finally the gas part passes through the diffuser 400 and flows out from the air outlet 112 .
  • the distance L3 between the outer edge of the first guidance hood 306 and the axis of the first impeller 300 is greater than the distance L4 between the outer edge of the first turntable 302 and the axis of the first impeller 300 , which may ensure that a flow field of an outlet end of the first impeller 300 is more uniform, and flow losses of the diffusion passage 602 and the backflow passage 604 are reduced.
  • the first impeller 300 is a centrifugal impeller
  • the diffusion passage 602 is provided with a bend
  • the diameter of the diffusion passage 602 gradually increases in the gas flow direction, so that airflow may be turned, decelerated and pressurized in the diffusion passage 602 , thereby reducing the radial size of the first impeller 300 .
  • the backflow passage 604 is designed in cooperation with the guide blade 704 , to achieve an effect of performing rectification and removing rotation on airflow.
  • the flow guidance structure 800 is arranged on the rotation shaft 200 , and a profile of the flow guidance structure 800 is a streamlined profile, and tangent to the first straight line 712 of the backflow disk 702 and the second impeller 500 to achieve smooth transitions.
  • the distance L5 between the outer edge of the second guidance hood 506 and the axis of the second impeller 500 is greater than the distance L6 between the outer edge of the second turntable 502 and the axis of the second impeller 500 , and on the axial section of the rotation shaft 200 , an included angle ⁇ formed between the straight line where the extension line of the radial edge of the second turntable 502 is located intersects with the axis of the rotation shaft 200 is greater than or equal to 80° and less than or equal to 89°, which may optimize two-stage aerodynamic load matching and improve aerodynamic efficiency of the whole machine.
  • the diffuser 400 uses a three-stage axial flow diffuser instead of the radial diffuser, thereby reducing the radial size of the fan assembly.
  • Some embodiments of a second aspect of the disclosure provide a vacuum cleaner, including the fan assembly according to any one of the above embodiments.
  • the vacuum cleaner provided in some embodiments includes the fan assembly according to any one of the above embodiments. Therefore, the vacuum cleaner has all the advantageous effects of the above fan assembly, which are not elaborated one by one here.
  • the vacuum cleaner provided in some embodiments may be a hand-held vacuum cleaner, has structural characteristics of miniaturization, and is convenient for users to use it.
  • a large suction operation of the hand-held vacuum cleaner may be achieved due to cooperation of the first impeller 300 with the second impeller 500 , thereby improving operation distance and operation effect of the hand-held vacuum cleaner.
  • a structural size of the hand-held vacuum cleaner is effectively reduced, especially a radial size of the hand-held vacuum cleaner is reduced, which is convenient for users to hold and operate the vacuum cleaner on one hand, and extend the vacuum cleaner into a narrow space to operate on the other hand.
  • the fan assembly provided in some embodiments includes the first impeller 300 , the diffusion passage 602 , the backflow passage 604 , the rotation shaft 200 , the flow guidance structure 800 , the second impeller 500 , fins 108 , the nut 202 , the diffuser 400 , and other structures. Air passes through the first impeller 300 , the diffusion passage 602 , the backflow passage 604 , the flow guidance structure 800 , the second impeller 500 and the diffuser 400 sequentially, to achieve a purpose of pressurization.
  • the first impeller 300 is fixed onto the rotation shaft 200 by the nut 202 , and the rotation direction of the nut 202 is opposite to that of the rotation shaft 200 , to ensure that the first impeller 300 does not fall off during operation.
  • the distance between the outer edge of the first guidance hood 306 and the axis of the first impeller 300 is slightly greater than the distance between the outer edge of the first turntable 302 and the axis of the first impeller 300 , to control the flow field of the outlet end of the first impeller 300 to be more uniform, and reduce flow losses of the diffusion passage 602 and the backflow passage 604 .
  • the diffusion passage 602 is defined by the first arc line 710 of the backflow disk 702 and the second arc line 114 of the inner wall of the shell 100 .
  • the first circle center O 1 of the first arc line 710 is not coincide with the second circle center O 2 of the second arc line 114 , and the first circle center O 1 of the first arc line 710 is closer to the first turntable 302 of the first impeller 300 in the axial direction than the second circle center O 2 of the second arc line 114 .
  • the distance between the first circle center O 1 of the first arc line 710 and the first turntable 302 is L1
  • the distance between the second circle center O 2 of the second arc line 114 and the second turntable 502 is L2
  • the diffusion passage 602 forms a gradually expanding passage, and the diffusion passage 602 itself is provided with a bend, which forms the diffusion passage 602 integrating diffusion and bending together, so that airflow may be decelerated and pressurized while turning, thereby reducing the radial size of the first impeller 300 .
  • values of (L1-L2)/L1 may be selected as 2%, 3%, 4%, 5%, 6%, 7%, etc.
  • the backflow passage 604 is defined by the first straight line 712 of the backflow disk 702 and the second straight line 116 of the inner wall of the shell 100 , and is used in cooperation with a backflow coupling 16 and the guide blade 704 .
  • the first straight line 712 and the second straight line 116 are vertically parallel to each other and cooperate with the guide blade 704 , to achieve an effect of performing rectification and removing rotation on airflow.
  • the rotation shaft 200 is provided with the flow guidance structure 800 and the thread.
  • the rotation direction of the thread is opposite to that of the rotation shaft 200 , to ensure that the first impeller 300 does not fall off during operation.
  • An outer wall of the flow guidance structure 800 is streamlined and tangent to the first straight line 712 of the backflow disk 702 and the second impeller 500 to achieve smooth transitions, so that the flow-past passage 900 is formed between the flow guidance passage 600 and interior of the shell 100 , and it ensures that the first impeller 300 is stably mounted on the rotation shaft 200 .
  • the distance between the outer edge of the second guidance hood 506 and the axis of the second impeller 500 is slightly greater than the distance between the outer edge of the second turntable 502 and the axis of the second impeller 500 , and on the axial section of the rotation shaft 200 , the straight line where the extension line of the radial edge of the second turntable 502 is located is not perpendicular to the axis of the rotation shaft 200 , instead, forms an included angle ⁇ with the axis of the rotation shaft 200 , and the included angle ⁇ is between 80° and 89°, to achieve an effect of optimizing two-stage aerodynamic load matching and improving aerodynamic efficiency of the whole machine.
  • values of the included angle ⁇ may be selected as 80°, 81°, 82°, 83°, 84°, 85°, 86°, 87°, 88°, 89°, etc.
  • 27 fins 108 are connected to the first mounting segment 102 and the second mounting segment 104 of the shell 100 , to play a role of cooling airflow.
  • the fins 108 are made of an easily thermal-conductive metal material, arranged between the first impeller 300 and the second impeller 500 , and seamlessly connected to the shell 100 .
  • the diffuser 400 uses a three-stage axial flow diffuser and includes three rows of diffusion blades 402 , the three rows of diffusion blades 402 include 11, 15 and 23 diffusion blades in number respectively and are sequentially arranged in the gas flow direction, and a rotation angle of each stage of diffusion blades 402 gradually decreases in the gas flow direction.
  • the diffusion blade 402 is a ternary blade.
  • the fan assembly uses a solution of two-stage impellers, which may reduce rotation speeds of the impellers by 33% with the same air volume and wind pressure.
  • the same suction power may be achieved at a lower rotation speed, which achieves an effect of reducing noise of the vacuum cleaner.
  • some embodiments use the diffusion passage 602 , the backflow passage 604 and a three-stage axial flow diffuser, which may greatly reduce the radial size of the multi-stage fan assembly, and the radial size of the fan assembly is reduced by 20% compared to a radial size of a fan assembly of a traditional two-stage vacuum cleaner, is equivalent to a radial size of a fan assembly of a prevailing single-stage vacuum cleaner, and significantly improves aerodynamic efficiency compared to the single-stage vacuum cleaner.
  • the radial end surface of the backflow disk 702 on the axial section of the rotation shaft 200 and the part of the inner wall of the shell 100 forming the diffusion passage 602 are not limited to arc lines, and spline curve and Bezier curve may also achieve similar effects.
  • a circle center of the spline curve may be understood as a midpoint of a line connecting two end points of the spline curve.
  • a circle center of the spline curve may be understood as a midpoint of a line connecting two end points of the Bezier curve.
  • multiple guide blades 704 of the backflow structure 700 may be provided and are not limited to 16 guide blades.
  • multiple fins 108 may be provided and are not limited to 27 fins, and shape of the fin 108 is not limited to a sheet shape.
  • the diffuser 400 is not limited to configuration of three rows of diffusion blades 402 , and diffusion blades 402 are not limited to 11, 15 and 23 diffusion blades in number.
  • a solid line in the figure indicates relevant data of the fan assembly provided in some embodiments
  • a dotted line in the figure indicates test data of a fan assembly in the related art. It may be seen from FIG. 8 clearly that the fan assembly provided in some embodiments is significantly superior to the related art in terms of air supply capacity, radial size and working noise.
  • connection may be a fixed connection, a detachable connection, or an integral connection; may be a direct connection, or an indirect connection through an intermediate medium.

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