EP1669014A2 - Soufflante d'aspirateur et ensemble moteur - Google Patents

Soufflante d'aspirateur et ensemble moteur Download PDF

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Publication number
EP1669014A2
EP1669014A2 EP05356169A EP05356169A EP1669014A2 EP 1669014 A2 EP1669014 A2 EP 1669014A2 EP 05356169 A EP05356169 A EP 05356169A EP 05356169 A EP05356169 A EP 05356169A EP 1669014 A2 EP1669014 A2 EP 1669014A2
Authority
EP
European Patent Office
Prior art keywords
impeller
air guide
lower plate
motor
vacuum cleaner
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.)
Withdrawn
Application number
EP05356169A
Other languages
German (de)
English (en)
Other versions
EP1669014A3 (fr
Inventor
Sung-Cheol Lee
Hwa-Gyu Song
Hyun-Jun Oh
Myung-Won Lee
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Gwangju Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020050015069A external-priority patent/KR100633431B1/ko
Application filed by Samsung Gwangju Electronics Co Ltd filed Critical Samsung Gwangju Electronics Co Ltd
Publication of EP1669014A2 publication Critical patent/EP1669014A2/fr
Publication of EP1669014A3 publication Critical patent/EP1669014A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • 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
    • F04D29/30—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade

Definitions

  • the present invention relates generally to the field of vacuum cleaners. Some of the embodiments disclosed are directed more particularly to an impeller for a vacuum cleaner motor assembly.
  • a vacuum cleaner generates a partial vacuum and collects dust and impurities by the partial vacuum. Therefore, the vacuum cleaner has a motor assembly for generating the partial vacuum.
  • the partial vacuum is generated by an impeller that draws in air as it is rotated by a motor.
  • a conventional motor assembly 1 includes a motor 10, an impeller 20 rotated by the motor 10 and a diffuser 30 guiding air drawn in by the impeller 20 toward the motor 10.
  • the impeller 20 has a lower plate 21, an upper plate 22 and a plurality of air guide members 23.
  • the lower plate 21 is formed in the shape of a disk and disposed at a motor shaft 11 of the motor 10.
  • the upper plate 22 is formed in the shape of a disk to correspond with the lower plate 21 and has a substantially same diameter as the lower plate 21.
  • the upper plate 22 has an air inlet 25 drawing in air at its center.
  • a plurality of air guide members 23 are disposed radially between the lower plate 21 and the upper plate 22 at regular intervals.
  • Each of the air guide members 23 is formed in the shape of a bent band having a predetermined curvature.
  • one end 23a of the air guide members 23 is formed with right angles at peripheries of the lower plate 21 and the upper plate 22.
  • the air guide member 23 has a length such that its outside end 23 a is within the periphery of lower plate 21 and upper plate 22, and its inside end is outside of the air inlet 25 of the upper plate 22.
  • the diffuser 30 is disposed at an upper end of the motor 10 in concentric circles outside the impeller 20. There is a gap between the diffuser 30 and the impeller 20 to rotate the impeller 20.
  • the diffuser 30 has a plurality of guide members for guiding the air when the air is drawn in and discharged by the impeller 20 toward the motor 10.
  • the impeller 20 When the motor 10 of the motor assembly 1 rotates, the impeller 20 is rotated by the lower plate 21 disposed at the motor shaft 11 of the motor 10.
  • the dust-laden air which may contain dust and impurities, is drawn in through a dust inlet of a suction brush (not shown) fluidly connected with the air inlet 25 of the upper plate 22 of the impeller 20. Dust and impurities in the air are removed while passing through a dust-collecting unit (not shown), and accordingly, substantially clean air enters the air inlet 25 of the impeller 20.
  • the air entered into the air inlet 25 flows along the plurality of air guide members 23 and discharges toward the diffuser 30.
  • the air discharged from the diffuser 30 cools the motor 10 and is discharged outside the vacuum cleaner through an outlet of a main body thereof (not shown).
  • the vacuum cleaner which collects the dust and impurities by the suction force of the motor assembly 1, generates considerable noise. Accordingly, efforts have been made to reduce the noise.
  • One approach is to change the flow passage of air discharged through the motor assembly.
  • Another is to provide sound-absorbing materials.
  • these methods do not efficiently reduce noise.
  • the inventors have found that it is desirable to reduce a noise peak at a frequency of 8 ⁇ 10khz, in particular, among the noises that are generated by rotating of the impeller of the motor assembly, to make operation more pleasant for the user.
  • an impeller for a vacuum cleaner that reduces peak noise generated during rotation of the impeller, particularly (for example) in the frequency range of 8 ⁇ 10khz.
  • a motor assembly is provided with a noise-reducing impeller.
  • an impeller for a vacuum cleaner comprising a lower plate in a shape of a disk; an upper plate separated from the lower plate at a predetermined distance, the upper plate having a diameter corresponding to the lower plate and a central air inlet; and a plurality of air guide members disposed radially between the lower plate and the upper plate, with the plurality of air guide members chamfered at both corners at their outside ends.
  • the dimensions of the chamfered corner satisfy the following formula: 1.5 mm ⁇ B ⁇ C / 2 where B is the dimension of the chamfered corner measured in the width direction of the air guide member and C is the width of the air guide member.
  • the plurality of air guide members may be attached to the upper plate and the lower plate with cogging joints.
  • a dimension A of the chamfered corner measured along the length of the air guide member is shorter than a distance between an outside end of the air guide member and the outermost cogging joint. Also, it is preferred that this dimension A is between about 1.5mm and about 3mm.
  • an impeller for a vacuum cleaner comprises a lower plate in a shape of a disk; a plurality of air guide members disposed radially on the lower plate and having chamfered corners at their outer ends; and an upper plate disposed on the plurality of air guide members, the upper plate having a central air inlet and a diameter corresponding to an inner beginning point of the upper chamfers of the air guide members.
  • a motor assembly for a vacuum cleaner comprises a motor and an impeller, the impeller comprising: a lower plate disposed at a motor shaft of the motor, the lower plate in a shape of a disk, an upper plate separated from the lower plate at a predetermined distance, the upper plate having a diameter corresponding to the lower plate and a central air inlet, and a plurality of air guide members disposed radially between the lower plate and the upper plate, with their corners chamfered at the outer ends thereof; and a diffuser disposed at an upper portion of the motor, the diffuser guiding air drawn in from the impeller toward the motor.
  • dimensions of the chamfered corners are selected according to the following formula: 1.5 mm ⁇ B ⁇ C / 2 where B is the dimension of the chamfered corner measured in the width direction of the air guide member and C is the width of the air guide member.
  • the plurality of air guide members may be attached to the upper plate and the lower plate with cogging joints.
  • a dimension A of the chamfered corner measured along the length of the air guide member is shorter than a distance between an outside end of the air guide member and the outermost cogging joint. Also, it is preferred that this dimension A is between about 1.5mm and about 3mm.
  • a motor assembly for a vacuum cleaner comprises a motor and an impeller, the impeller comprising: a lower plate disposed at a motor shaft of the motor, the lower plate in a shape of a disk, a plurality of air guide members disposed radially on the lower plate, the plurality of air guide members chamfered at both outside corners thereof and an upper plate disposed on the plurality of air guide members, the upper plate having a diameter corresponding with a lengthwise beginning point of the chamfered corner of the air guide member and a central air inlet thereof ; and a diffuser disposed at an upper portion of the motor, the diffuser guiding air drawn in from the impeller toward the motor.
  • a vacuum cleaner comprising a suction brush, a dust collecting unit fluidly connected with the suction brush and collecting dust, and a motor assembly fluidly connected with the dust collecting unit and generating a suction force.
  • the motor assembly includes a motor; an impeller comprising: a lower plate disposed at a motor shaft of the motor, the lower plate in a shape of a disk, an upper plate separated from the lower plate at a predetermined distance, the upper plate having a diameter corresponding to the lower plate and a central air inlet, and a plurality of air guide members disposed radially between the lower plate and the upper plate, with their corners chamfered at the outer ends thereof; and a diffuser disposed at an upper portion of the motor, the diffuser guiding air drawn in from the impeller toward the motor.
  • Tested embodiments of the impeller reduce peak overall noise in the frequency range of 8 ⁇ 10 khz as compared with conventional impellers.
  • a motor assembly incorporating the improved impeller disclosed in various embodiments reduces overall noise and particularly peak noise in the frequency range of 8 ⁇ 10 khz relative to noise levels found in conventional devices.
  • FIG. 1 is a cross sectional view illustrating a conventional motor assembly
  • FIG. 2 is a perspective view illustrating an impeller for a vacuum cleaner used in the motor assembly shown in FIG. 1;
  • FIG. 3 is a plain view illustrating an impeller rotating inside a diffuser
  • FIG. 4 is a view illustrating noise sources of an impeller as determined by a computer simulation analysis of an air flow
  • FIG. 5 is a perspective view illustrating an impeller for a vacuum cleaner according to a first exemplary embodiment of the present invention
  • FIG. 6 is a front view illustrating the impeller for the vacuum cleaner shown in FIG. 5;
  • FIG. 7 is a view showing chamfering of an air guide member of the impeller for the vacuum cleaner shown in FIG. 5;
  • FIG. 8 is a view illustrating a motor assembly having an impeller according to the first embodiment of the present invention.
  • FIG. 9 is a view illustrating an air guide member of a first test impeller used for a noise comparative test
  • FIG. 10 is a graphical illustration showing noise of the first test impeller having the air guide member shown in FIG. 9 and noise of an impeller according to the first embodiment of the present invention
  • FIG. 11 is a view illustrating an air guide member of a second test impeller used for another noise comparative test
  • FIG. 12 is a graphical illustration showing noise of the second test impeller having the air guide member shown in FIG. 11 and noise of an impeller according to the first embodiment of the present invention
  • FIG. 13 is a perspective view illustrating an impeller for a vacuum cleaner according to a second embodiment of the present invention.
  • FIG. 14 is a partial front view illustrating the impeller for the vacuum cleaner shown in FIG. 13;
  • FIG. 15 is a view illustrating a motor assembly having an impeller according to the second embodiment of the present invention.
  • FIG. 16 is a graphical illustration showing noise of the conventional impeller and noise of an impeller according to the second embodiment of the present invention.
  • FIG. 17 is a view illustrating a vacuum cleaner having a motor assembly according to an embodiment of the present invention.
  • Airflow in the impeller 20 was analyzed by computer simulation of rotation of impeller 20 inside a diffuser 30 as shown in Fig. 3.
  • the analysis result is shown in Fig. 4.
  • triangular tails 23b are respectively attached to outside ends 23a of the plurality of air guide members 23.
  • the triangular tails 23b represent forces applied in the outside ends 23a of the plurality of air guide members 23. This indicates that noise is generated from outside ends 23a of the plurality of air guide members 23 when the impeller 20 rotates.
  • the inventors have determined that an interaction between outside ends 23a of the plurality of air guide members 23 of the impeller 20 and guide members 31 of the diffuser 30 may generate noise when the impeller 20 rotates inside the diffuser 30 as shown in FIG. 3.
  • a major noise source may be outside ends 23a of the plurality of air guide members 23.
  • the shape of outside end 23a of the air guide member 23 is changed, and the diameter of an upper plate of the impeller 20 may also be modified, to reduce noise arising from rotation of impeller 20, especially to reduce a noise peak in the frequency range of 8 ⁇ 10 kHz.
  • an impeller 110 for a vacuum cleaner has a lower plate 111, an upper plate 112 and a plurality of air guide members 113.
  • the lower plate 111 is formed in the shape of a disk and a center thereof is disposed at a motor shaft (not shown) of a motor.
  • the upper plate 112 is formed in the shape of a disk to correspond with the lower plate 111 and has substantially the same diameter as the lower plate 111.
  • the upper plate 112 has a central air inlet 115. Also, it is preferred that the air inlet 115 is formed to protrude from the upper plate 112 to a predetermined height.
  • a connecting part 114 connecting the air inlet 115 with the upper plate 112 is formed as a curved surface having a predetermined curvature to allow intake air to flow smoothly.
  • the plurality of air guide members 113 are disposed radially between the lower plate 111 and the upper plate 112 at regular intervals.
  • Each of the air guide members 113 is formed in the shape of a bent band having a predetermined curvature.
  • Each of the air guide members can be attached to the upper plate 112 and the lower plate 111 by various joining methods.
  • each of the air guide members is attached in the upper plate 112 and the lower plate 111 with cogging joints 116.
  • one end 113a of the air guide member 113 toward the periphery of the lower plate 111 and of the upper plate 112 has both of its corners chamfered as shown at 113c. It is preferred that chamfered corners 113c satisfy the dimensional conditions described below.
  • Fig. 7 is a view showing details of chamfers on corners 113c of the air guide member 113.
  • a dimension A of the chamfered corner is shorter than a distance between an outside end of the air guide member and the outermost cogging joint.
  • Dimension A will be referenced herein as the "lengthwise dimension" of chamfered corner 113. Also, it is preferred that this dimension A is between about 1.5mm and about 3mm.
  • a length B of the air guide member's widthwise direction of the chamfered corner 113c is so determined to satisfy Formula 1: 1.5 mm ⁇ B ⁇ C / 2 where B is the widthwise dimension of the chamfered corner 113c, and C is the width of air guide member 113.
  • the air guide member 113 has a length such that one end 113a thereof is inside the peripheries of the lower plate 111 and of the upper plate 112 and the other end thereof is outside of the air inlet 115 of the upper plate 112.
  • a motor assembly 100 for the vacuum cleaner having an impeller according to a first embodiment of the present invention includes a motor 101, an impeller 110 rotated by the motor 101 and a diffuser 120 guiding air drawn in by the impeller 110 toward the motor 101.
  • motor 101 Any of various types of motors operating at approximately 3,000 rpm to 3,600 rpm which are used generally in vacuum cleaners may be used as the motor 101.
  • a universal motor operating at 3,000 rpm is used.
  • this example is not intended to limit the scope of the present invention, as a wide variety of motors may be used for this purpose.
  • the impeller 110 has a lower plate 111, an upper plate 112 and a plurality of air guide members 113.
  • the lower plate 111 is formed in the shape of a disk and a center thereof is disposed at a motor shaft 102 of a motor 101.
  • the upper plate 112 is formed in the shape of a disk to correspond with the lower plate 111 and has substantially the same diameter as the lower plate 111.
  • the upper plate 112 has a centrally located air inlet 115 for drawing in air. Also, the air inlet 115 is formed to protrude from the upper plate 112 to a predetermined height.
  • a connecting part 114 connecting the air inlet 115 with the upper plate 112 is formed as a curved surface having a predetermined curvature to allow intake air to flow smoothly.
  • the plurality of air guide members 113 are disposed radially between the lower plate 111 and the upper plate 112 at regular intervals.
  • Each of the air guide members 113 is formed in the shape of a bent band having a predetermined curvature.
  • 9 air guide members 113 are attached to the upper plate 112 and the lower plate 111 with cogging joints 116. At this time, one end 113a of the air guide member 113 toward the periphery of the lower plate 111 and of the upper plate 112 has both of its corners 113c chamfered.
  • the chamfered corners 113c satisfy the conditions described above.
  • the lengthwise dimension A is 3mm.
  • the outermost of the cogging joints 116a, 116b is separated by over 3mm from the outside end 113a of the air guide member 113 (see Fig. 7).
  • the diffuser 120 is disposed at upper portion of the motor 101 in concentric circles outside the impeller 110. There is a gap between the diffuser 120 and the impeller 110 to rotate the impeller 110.
  • the diffuser 20 has a plurality of guide members for guiding air when the air is drawn in and discharged by the impeller 110 toward the motor 101.
  • the diffuser 120 shown in Figs. 3 and 8 is an exemplary diffuser that can be used in the motor assembly 100 for the vacuum cleaner, and one will appreciate that various types of diffusers can be used.
  • impeller peak noise in the frequency range of 8 ⁇ 10khz is reduced compared to devices having a conventional impeller as shown in Table 1, Figs 10 and 12.
  • the peak noise of the impeller 110 according to the first embodiment of the present invention is reduced by approximately 9dB compared to a first test impeller having the air guide member 23 as shown Fig. 9, and by approximately 7.3dB compared to a second test impeller having the air guide member 23' shown in Fig. 11.
  • thick curved lines 1 and 3 indicate respectively noise of the impeller according to the first embodiment of the present invention and thin curved lines 2 and 4 indicate respectively noise of the first test impeller and the second test impeller.
  • Both corners 113c of outside end 113a of the air guide member 113 of the impeller 110 according to the first embodiment of the present invention are chamfered.
  • Both corners 23d of an outside end of the air guide member 23 of the first test impeller form right angles as shown in Fig. 9.
  • An air guide member 23' of the second test impeller has a groove 23a' with a predetermined radius at an outside end thereof as shown in Fig. 11.
  • the impeller 110 according to the first embodiment of the present invention, the first and second test impellers have 8 or 9 air guide members.
  • a universal motor operating at 3,000 rpm is used for the test.
  • the graphical representation of generated noise in Figs. 10 and 12 indicates a peak noise level in the frequency range of 8 ⁇ 10khz.
  • the frequency range of 8 ⁇ 10khz generally includes a second BPF (Blade Passage Frequency) of the impeller.
  • the BPF represents the number of blades passing per second measured in cycles per second (Hz).
  • Hz cycles per second
  • the second-degree BPF is twice the first-degree BPF.
  • the second-degree BPF is 9,000 rpm.
  • the air discharged from the diffuser 120 cools the motor 101 and is discharged outside the vacuum cleaner through an outlet in the main body (not shown).
  • an impeller 110' for a vacuum cleaner has a lower plate 111, an upper plate 112' and a plurality of air guide members 113.
  • the lower plate 111 is formed in the shape of a disk and a center thereof is disposed at a motor shaft of a motor (not shown).
  • the upper plate 112' is formed in the shape of a disk to correspond with the lower plate 111 and has a shorter diameter than that of the lower plate 111.
  • the diameter of the upper plate 112' is determined to correspond with a chamfering dimension of the air guide member 113. It is preferred that the upper plate 112' has a diameter such that an outside periphery 112a' of the upper plate 112' corresponds with a lengthwise beginning point 113s of chamfered corner 113c of the air guide member 113.
  • the upper plate 112' has an air inlet 115 drawing in the air in a center thereof Also, the air inlet 115 is formed to protrude from the upper plate 112' to a predetermined height. And a connecting part 114' connecting the air inlet 115 with the upper plate 112' is formed as a curve surface having a predetermined curvature to allow the drawn in air to flow smoothly.
  • the plurality of air guide members 113 are disposed radially between the lower plate 111 and the upper plate 112' at regular intervals.
  • Each of the air guide members 113 is formed in the shape of a bent band having a predetermined curvature.
  • Each of the air guide members 113 can be attached to upper plate 112' and lower plate 111 with various types of jointing methods.
  • each of the air guide members 113 is attached to the upper plate 112' and the lower plate 111 with cogging joints 116.
  • one end 113a of the air guide member 113 at the periphery of the lower plate 111 and of the upper plate 112' has chamfers at both corners 113c. The chamfering process will not be explained hereinafter since it is similar to that of the air guide member 113 of the impeller 110 according to a first embodiment of the present invention as described above.
  • a lengthwise dimension A of the chamfered corner 113c is shorter than a distance between one end 113a of the air guide member 113 and the outermost joint 116a, 116b among cogging joints 116 which attach the air guide member 113 to the lower plate 111 and the upper plate 112'. Also, it is preferred that the lengthwise dimension A of the chamfered corner 113c of the air guide member 113 is between approximately 1.5mm and 3mm from an original corner 113d thereof.
  • the air guide member 113 preferably has a length such that one end 113a thereof is inside the periphery of the lower plate 111 and the other end thereof is outside of the air inlet 115 of the upper plate 112'.
  • Fig. 15 is a sectional view illustrating a motor assembly for the vacuum cleaner having an impeller 110' according to the second embodiment of the present invention.
  • a motor assembly 100' for the vacuum cleaner having the impeller 110' includes a motor 101, an impeller 110' rotated by the motor 101 and a diffuser 120 guiding intake air drawn by the impeller 110' toward the motor 101.
  • motor 101 Any of various types of motors having approximately between 3,000 rpm and 3,600 rpm which are used generally in vacuum cleaners may be selected as the motor 101. In the present embodiment, a universal motor having 3,000rpm is used. However, the scope of the invention is not limited to any particular motor 101.
  • the impeller 110' has a lower plate 111, an upper plate 112' and a plurality of air guide members 113.
  • the lower plate 111 is formed in the shape of a disk and a center thereof is disposed at a motor shaft 102 of the motor 101.
  • the upper plate 112' is formed in the shape of a disk to correspond with the lower plate 111 and has a diameter to correspond with beginning points 113s of the chamfered corner 113c of a plurality of air guide members 113.
  • the upper plate 112' has a central air inlet 115 for drawing intake air. Also, the air inlet 115 is formed to protrude from the upper plate 112' to a predetermined height.
  • a connecting part 114' connecting the air inlet 115 with the upper plate 112' is formed as a curved surface having a predetermined curvature to allow the intake air to flow smoothly.
  • a plurality of air guide members 113 are disposed radially between the lower plate 111 and upper plate 112' at regular intervals. Each of the air guide members 113 is formed in the shape of a bent band having a predetermined curvature. In the present embodiment, 9 air guide members are attached to the upper plate 112' and the lower plate 111 with cogging joints 116. At an end 113a of the air guide member 113 nearest the periphery of lower plate 111 and upper plate 112', both corners 113c are chamfered.
  • the chamfered corners 113c are formed to satisfy the conditions described above.
  • a width C of the air guide member 113 is approximately 7mm
  • the outermost cogging joint 116a, 116b is spaced apart by 3mm or more from the outside end 113a of the air guide member 113 (see Fig. 14).
  • the diffuser 120 is disposed at an upper portion of the motor 101 in concentric circles outside the impeller 110'. There is a gap between the diffuser 120 and the impeller 110' to rotate the impeller 110'.
  • the diffuser 120 has a plurality of guide members for guiding air, when the air is drawn in and discharged by the impeller 110' toward the motor 101.
  • the diffuser 120 shown in Fig. 15 is an example of a diffuser that can be used in the motor assembly 100' for the vacuum cleaner according to the present invention. Various types of diffusers can also be used in the motor assembly 100'.
  • peak impeller noise in the frequency range of approximately 8 ⁇ 10khz of the motor assembly 100' having an impeller 110' according to the second embodiment of the present invention is significantly reduced, compared to a motor assembly having a conventional impeller as shown in Table 2 and Fig. 16.
  • Peak noise generated by the impeller 110' according to the second embodiment of the present invention is reduced by approximately 6.5dB compared to the conventional impeller.
  • a thick line 5 indicates noise of the impeller 110' according to the second embodiment of the present invention and a thin line 6 indicates noise of the conventional impeller.
  • overall noise that averages noise in frequency of total range is reduced by approximately 1.6dBA.
  • the upper plate 112' of the impeller 110' has a diameter corresponding to the beginning points 113s of the chamfered corners 113c of air guide members 113 (see Fig 14).
  • Impeller 20 according to the conventional art has a plurality of air guide members 23 having right angles at corners 23d of their outside ends as shown Fig. 9.
  • the impeller 110' according to the second embodiment of the present invention and the conventional impeller 20 respectively have 8 or 9 air guide members.
  • a universal motor operating at 3,000 rpm is used for the noise test.
  • the term "overall noise” refers to average noise in the total frequency range.
  • the "peak noise” in the range of approximately 8 ⁇ 10khz refers to a noise having a peak value in frequency of 8 ⁇ 10khz.
  • the frequency range of 8 ⁇ 10khz generally includes a second BPF (Blade Passage Frequency) of the impeller.
  • the BPF represents the number of blades passing per a second measured in cycles per second (Hz). For example, when the motor rotates at 3000 rpm and the impeller has 9 air guide members, the BPF is 4,500Hz. This is called as a first-degree BPF.
  • the second-degree BPF is twice the first-degree BPF. In the present embodiment, the second-degree BPF is approximately 9,000 rpm.
  • FIG. 17 is a view illustrating a vacuum cleaner having the motor assembly 100 having an impeller 110 according to the first embodiment of the present invention.
  • the vacuum cleaner 200 includes a suction brush 210 that draws in dust and impurities, an extension pipe 220 fluidly connecting between the suction brush 210 and a main body 230, and the main body 230 that is partitioned into a dust collecting portion (not shown) and a motor portion 231.
  • the suction brush 210 has a dust inlet (not shown), which draws in dust and impurities at the bottom thereof.
  • a dust-collecting unit (not shown), which separates and collects dust and impurities from the dust-laden air drawn in through the suction brush 210, is disposed at the dust collecting portion (not shown).
  • a dust bag or cyclone dust collecting unit may be used as the dust-collecting unit.
  • a motor assembly 100 which generates a suction force drawing in dust and impurities through the suction brush 210, is disposed within the motor portion 231.
  • the motor assembly 100 has a motor 101, an impeller 110 (see Fig. 8) rotated by the motor 101 and a diffuser 120 guiding air drawn in by the impeller 110 toward the motor 101.
  • the impeller 110 has a plurality of air guide members 113. An outside end 113a of the air guide member 113 thereof has chamfered corners 113c. Since the motor assembly 100 is similar to that described above, a detailed explanation will be o
  • the motor 101 located in motor portion 231 starts rotating.
  • the impeller 110 disposed at an end of the motor shaft 102 rotates.
  • the impeller 110 rotates, dust-laden air is drawn in through the dust inlet of the suction brush 210.
  • the dust and impurities contained in the dust-laden air are removed while passing through the dust-collecting unit located in the dust collecting portion, and as a result, the dust-laden air is cleaned.
  • the cleaned air enters into the air inlet 115 of the impeller 110, passes outside ends 113a of a plurality of air guide members 113 and enters into the diffuser 120 (see Figs. 7 and 8).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Electric Suction Cleaners (AREA)
EP05356169A 2004-12-09 2005-09-23 Soufflante d'aspirateur et ensemble moteur Withdrawn EP1669014A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20040103355 2004-12-09
KR1020050015069A KR100633431B1 (ko) 2004-12-09 2005-02-23 진공청소기용 임펠러 및 이를 구비한 모터 조립체

Publications (2)

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EP1669014A2 true EP1669014A2 (fr) 2006-06-14
EP1669014A3 EP1669014A3 (fr) 2007-10-24

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EP05356169A Withdrawn EP1669014A3 (fr) 2004-12-09 2005-09-23 Soufflante d'aspirateur et ensemble moteur

Country Status (4)

Country Link
US (1) US20060127240A1 (fr)
EP (1) EP1669014A3 (fr)
JP (1) JP2006161803A (fr)
RU (1) RU2310365C2 (fr)

Cited By (3)

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EP2000070A3 (fr) * 2007-06-07 2009-10-14 Kabushiki Kaisha Toshiba Ventilateur électrique et aspirateur électrique l'utilisant
TWI460352B (zh) * 2010-04-21 2014-11-11 Hitachi Appliances Inc Electric blower and equipped with its electric vacuum cleaner
SE2050615A1 (en) * 2020-05-28 2021-11-29 Husqvarna Ab Improved blower arrangements and silencers for dust extractors

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JP5295682B2 (ja) * 2008-08-08 2013-09-18 株式会社東芝 電動送風機および電気掃除機
JP2010106805A (ja) * 2008-10-31 2010-05-13 Toshiba Corp 電動送風機および電気掃除機
JP6078945B2 (ja) * 2011-11-04 2017-02-15 ダイキン工業株式会社 遠心送風機
US9451855B2 (en) * 2013-02-28 2016-09-27 Omachron Intellectual Property Inc. Surface cleaning apparatus
KR20140118456A (ko) * 2013-03-29 2014-10-08 삼성전기주식회사 디퓨져 결합모듈 및 이를 포함하는 전동송풍기
JP5726242B2 (ja) * 2013-07-19 2015-05-27 三菱重工業株式会社 インペラ及び回転機械
AU2014393558B2 (en) * 2014-05-09 2017-09-07 Mitsubishi Electric Corporation Centrifugal blower and electric vacuum cleaner
CA2908157C (fr) * 2014-10-10 2021-03-23 Emerson Electric Co. Entree de ventilateur d'aspirateur efficace
US10448797B2 (en) 2016-10-19 2019-10-22 Tti (Macao Commercial Offshore) Limited Vacuum cleaner
JP2022185276A (ja) * 2021-06-02 2022-12-14 株式会社デンソー 遠心送風機

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FR648371A (fr) * 1927-06-20 1928-12-08 Sev Marchal Perfectionnements aux turbines centrifuges pour aspiration ou soufflage
NL7015615A (fr) * 1970-10-24 1972-04-26
WO1991002163A1 (fr) * 1989-08-10 1991-02-21 Metronic Electronic Gmbh Ventilateur a moteur electrique
JPH04311698A (ja) * 1991-04-11 1992-11-04 Matsushita Electric Ind Co Ltd 電動送風機
JPH0587094A (ja) * 1991-09-26 1993-04-06 Matsushita Electric Ind Co Ltd 電動送風機
EP0648939A2 (fr) * 1993-10-18 1995-04-19 Hitachi, Ltd. Machine centrifuge pour fluides
JP2001073994A (ja) * 1999-08-31 2001-03-21 Hitachi Ltd 電動送風機及びこれを備えた電気掃除機
EP1325702A2 (fr) * 2002-01-03 2003-07-09 Lg Electronics Inc. Soufflante centrifugal pour aspirateur

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US3221398A (en) * 1961-01-25 1965-12-07 Ruth D Mayne Method of manufacturing a turbine type blower wheel
GB0202839D0 (en) * 2002-02-07 2002-03-27 Johnson Electric Sa Blower motor

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FR648371A (fr) * 1927-06-20 1928-12-08 Sev Marchal Perfectionnements aux turbines centrifuges pour aspiration ou soufflage
NL7015615A (fr) * 1970-10-24 1972-04-26
WO1991002163A1 (fr) * 1989-08-10 1991-02-21 Metronic Electronic Gmbh Ventilateur a moteur electrique
JPH04311698A (ja) * 1991-04-11 1992-11-04 Matsushita Electric Ind Co Ltd 電動送風機
JPH0587094A (ja) * 1991-09-26 1993-04-06 Matsushita Electric Ind Co Ltd 電動送風機
EP0648939A2 (fr) * 1993-10-18 1995-04-19 Hitachi, Ltd. Machine centrifuge pour fluides
JP2001073994A (ja) * 1999-08-31 2001-03-21 Hitachi Ltd 電動送風機及びこれを備えた電気掃除機
EP1325702A2 (fr) * 2002-01-03 2003-07-09 Lg Electronics Inc. Soufflante centrifugal pour aspirateur

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2000070A3 (fr) * 2007-06-07 2009-10-14 Kabushiki Kaisha Toshiba Ventilateur électrique et aspirateur électrique l'utilisant
TWI460352B (zh) * 2010-04-21 2014-11-11 Hitachi Appliances Inc Electric blower and equipped with its electric vacuum cleaner
SE2050615A1 (en) * 2020-05-28 2021-11-29 Husqvarna Ab Improved blower arrangements and silencers for dust extractors
SE544297C2 (en) * 2020-05-28 2022-03-29 Husqvarna Ab Improved blower arrangements and silencers for dust extractors

Also Published As

Publication number Publication date
JP2006161803A (ja) 2006-06-22
US20060127240A1 (en) 2006-06-15
RU2310365C2 (ru) 2007-11-20
RU2005130313A (ru) 2007-04-10
EP1669014A3 (fr) 2007-10-24

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