US20200378398A1 - Impeller, blower, and vacuum cleaner - Google Patents
Impeller, blower, and vacuum cleaner Download PDFInfo
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- US20200378398A1 US20200378398A1 US16/890,080 US202016890080A US2020378398A1 US 20200378398 A1 US20200378398 A1 US 20200378398A1 US 202016890080 A US202016890080 A US 202016890080A US 2020378398 A1 US2020378398 A1 US 2020378398A1
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- Prior art keywords
- blade
- circumferential direction
- impeller
- radial
- impeller according
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Classifications
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- 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
- A47L5/24—Hand-supported suction cleaners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- 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
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- 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
- A47L5/14—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum cleaning by blowing-off, also combined with suction cleaning
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- 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
- A47L9/22—Mountings for motor fan assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- 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
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- 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
-
- 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
Definitions
- the present disclosure relates to an impeller, a blower, and a vacuum cleaner.
- the above configuration allows efficiency to be improved by converting the kinetic energy of the fluid into static pressure at the outlet of the impeller.
- the conventional impeller is required to further improve the blowing efficiency.
- An impeller according to an example embodiment of the present disclosure is rotatable about a vertically extending central axis.
- the impeller includes a base portion extending radially outward as it extends downward, a plurality of first blades circumferentially arrayed on the upper surface of the base portion and extending on one side in the circumferential direction as it extends upward, and a plurality of second blades between the circumferential direction of the circumferentially adjacent first blades and extending on one side in the circumferential direction as it extends upward.
- the radial outer end of the second blade is on one side in the circumferential direction relative to the middle in the circumferential direction of the radial outer end of the circumferentially adjacent first blade.
- FIG. 1 is a perspective view of a vacuum cleaner according to an example embodiment of the present disclosure.
- FIG. 2 is a perspective view of a blower according to an example embodiment of the present disclosure.
- FIG. 3 is a longitudinal cross-sectional view of the blower according to an example embodiment of the present disclosure.
- FIG. 4 is a perspective view of an impeller according to an example embodiment of the present disclosure.
- FIG. 5 is a front view of the impeller according to an example embodiment of the present disclosure.
- FIG. 6 is a plan view of the impeller according to an example embodiment of the present disclosure.
- FIG. 7 is a longitudinal cross-sectional view of the impeller according to an example embodiment of the present disclosure.
- FIG. 8 is a perspective view of the impeller according to an example embodiment of the present disclosure.
- FIG. 1 is a perspective view of the vacuum cleaner A according to an example embodiment of the present disclosure.
- the vacuum cleaner A is a so-called stick type electric vacuum cleaner, and includes a chassis 102 having an intake portion 103 and an exhaust portion 104 formed on a lower surface and an upper surface, respectively.
- a power cord (not shown) is led out from the rear surface of the chassis 102 .
- the power cord is connected to a power outlet (not shown) provided on the side wall surface of the living room, and supplies power to the vacuum cleaner A.
- the vacuum cleaner A may be a so-called robot type, canister type, or handy type vacuum cleaner.
- An air passage (not shown) connecting the intake portion 103 and the exhaust portion 104 is formed in the chassis 102 .
- a dust collecting portion (not shown), a filter (not shown), and the blower B are arranged in order from the upstream side toward the downstream side in the air passage.
- the blower B has an impeller 2 described later. Dust contained in gas flowing in the air passage is captured by the filter and collected in a dust collecting portion formed in a container shape.
- the dust collecting portion and the filter are configured removably to the chassis 102 .
- FIG. 2 is a perspective view of the blower B according to an example embodiment of the present disclosure
- FIG. 3 is a longitudinal cross-sectional view of the blower B according to an example embodiment of the present disclosure.
- FIG. 3 is a longitudinal cross-sectional view of an imaginary cross section A-A in FIG. 2 .
- the blower B has a motor 1 , the impeller 2 , and a housing 3 .
- the motor 1 is a so-called inner rotor type motor.
- the stator 11 has a stator core 111 , an insulator 112 , and a coil 113 .
- the stator core 111 is made of a magnetic material and has an annular core back and a teeth portion extending radially inward from the core back. At least a part of the teeth portion is surrounded by the insulator 112 .
- the coil 113 is formed by winding a conductive wire around the teeth portion via the insulator 112 .
- the blowing efficiency is improved because the area of the pressure surface of the first blade 22 becomes larger as compared with a case where the radial inner edge 221 extends radially outward along a plane orthogonal to the central axis J, for example. As shown in FIG. 5 , the radial inner edge 221 extends in the normal direction on the upper surface of the base portion 21 .
- the radial inner edge 221 of the first blade 22 is arranged along an imaginary line L radiating from the central axis J. That is, the radial inner edge 221 extends radially. This can enlarge the area of a space formed in between the circumferential direction C of the radial inner edges 221 of the adjacent first blades 22 , thereby improving the blowing efficiency.
- a radial outer end 237 at the radial inner edge 231 of at least one of the second blades 23 is arranged on the imaginary line L. More specifically, the radial outer end 237 at the radial inner edge 231 of the second blade 23 adjacent to one side in the circumferential direction C of a certain first blade 22 is arranged on the imaginary line L connecting the central axis J and the radial inner edge 221 of the first blade 22 .
- an upper edge 236 of the second blade 23 is a curved surface protruding to one side in the circumferential direction C. That is, when the second blade 23 is viewed from the radial outward, the upper edge 236 is curved so as to expand to one side in the circumferential direction C. This makes it possible to discharge gas radially outward and downward along the curved surface protruding to one side in the circumferential direction C in the second blade 23 , thereby improving the blowing efficiency. Furthermore, unlike the first blade 22 , the upper edge 236 of the second blade 23 is a curved surface protruding to one side in the circumferential direction C overall.
- the length in the circumferential direction C between the radial outer end 234 of a certain second blade 23 and the radial outer end 224 of the first blade 22 adjacent to the other side in the circumferential direction C of the second blade 23 is about twice the length in the circumferential direction C between the radial outer end 234 of the second blade 23 and the radial outer end 224 of the first blade 22 adjacent to one side in the circumferential direction C of the second blade 23 .
- the radial outer ends 224 of the first blade 22 are arranged at equal intervals in the circumferential direction C.
- the radial outer ends 234 of the second blade 23 are also arranged at equal intervals in the circumferential direction C. This improves the rotational balance of the impeller 2 . This allows the impeller 2 to accurately rotate about the central axis J even in a case where the impeller 2 rotates at a high speed.
- the first blade 22 is connected with the base portion 21 in a first connection region 25
- the second blade 23 is connected with the base portion 21 in a second connection region 26 .
- the base portion 21 is a substantially conical portion. Therefore, the first connection region 25 and the second connection region 26 are boundaries between portions where the first blade 22 and the second blade 23 extend, with the upper surface of the base portion 21 forming a substantially conical surface as a reference.
- the curvatures of the first connection region 25 and the second connection region 26 are not constant.
- the curvature of the first connection region 25 is larger than the curvature of the second connection region 26 .
- the minimum value of a radius R 1 of curvature in the first connection region 25 of the base portion 21 and the surface of the other side in the circumferential direction C of the first blade 22 is smaller than the minimum value of a radius R 2 of curvature in the second connection region 26 of the base portion 21 and the surface of the other side in the circumferential direction C of the second blade 23 . This can suppress the gas flowing in the vicinity of the first connection region 25 and the second connection region 26 from being separated from the negative pressure surfaces of the first blade 22 and the second blade 23 , thereby improving the blowing efficiency of the impeller 2 .
- the present disclosure can be used in an impeller, for example.
- the impeller of the present disclosure can also be used in a blower or a vacuum cleaner.
- the present disclosure can be used in other electrical apparatuses.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An impeller is rotatable about a vertically extending central axis and includes a base portion extending radially outward as it extends downward, first blades circumferentially arrayed on the upper surface of the base portion and extending on one side in the circumferential direction as it extends upward, and second blades between the circumferential direction of the circumferentially adjacent first blades and extending on one side in the circumferential direction as it extends upward. The radial outer end of the second blade is on one side in the circumferential direction relative to the middle in the circumferential direction of the radial outer end of the circumferentially adjacent first blade.
Description
- The present application claims priority under 35 U.S.C. § 119 to United States of American Application No. 62/856,274 filed on Jun. 3, 2019 and Japanese Application No. 2020-079489 filed on Apr. 28, 2020, the entire contents of which are hereby incorporated herein by reference.
- The present disclosure relates to an impeller, a blower, and a vacuum cleaner.
- As a conventional impeller, one that is provided in an electric blower is known, in which the impeller specific speed Ns (min−1, m3/min, m reference)=rotational speed N×√(flow rate Q)÷pump head H ¾=less than 1200, and the inlet area of the impeller is larger than the outlet area of the impeller.
- In the conventional impeller, the above configuration allows efficiency to be improved by converting the kinetic energy of the fluid into static pressure at the outlet of the impeller. However, the conventional impeller is required to further improve the blowing efficiency.
- An impeller according to an example embodiment of the present disclosure is rotatable about a vertically extending central axis. The impeller includes a base portion extending radially outward as it extends downward, a plurality of first blades circumferentially arrayed on the upper surface of the base portion and extending on one side in the circumferential direction as it extends upward, and a plurality of second blades between the circumferential direction of the circumferentially adjacent first blades and extending on one side in the circumferential direction as it extends upward. The radial outer end of the second blade is on one side in the circumferential direction relative to the middle in the circumferential direction of the radial outer end of the circumferentially adjacent first blade.
- The above and other elements, features, steps, characteristics and advantages of the present disclosure will become more apparent from the following detailed description of the example embodiments with reference to the attached drawings.
-
FIG. 1 is a perspective view of a vacuum cleaner according to an example embodiment of the present disclosure. -
FIG. 2 is a perspective view of a blower according to an example embodiment of the present disclosure. -
FIG. 3 is a longitudinal cross-sectional view of the blower according to an example embodiment of the present disclosure. -
FIG. 4 is a perspective view of an impeller according to an example embodiment of the present disclosure. -
FIG. 5 is a front view of the impeller according to an example embodiment of the present disclosure. -
FIG. 6 is a plan view of the impeller according to an example embodiment of the present disclosure. -
FIG. 7 is a longitudinal cross-sectional view of the impeller according to an example embodiment of the present disclosure. -
FIG. 8 is a perspective view of the impeller according to an example embodiment of the present disclosure. - Hereinafter, example embodiments of the present disclosure will be described with reference to the drawings. It is to be noted that in this description, the direction in which a central axis J of a blower B extends is referred to as “vertical” or “axial”, the direction orthogonal to the central axis J of the blower B is referred to as “radial”, and the direction along an arc centered on the central axis J of the blower B is referred to as “circumferential”. However, the above-mentioned “vertical” does not limit the direction of the blower B when it is actually incorporated into an apparatus. Furthermore, in the drawings, for the sake of convenience, the contents of the drawings such as dimensions may be different from the actual structure. In addition, in the drawings, hatching may be omitted for the sake of convenience. It is to be noted that in this description, the words such as vertical, axial, radial, and circumferential do not strictly indicate only these directions but also include directions slightly inclined from these directions.
- In addition, in the present description, the shape and positional relationship of each part of a vacuum cleaner A will be described with the direction of approaching a floor surface F being “downward” and the direction of departing from the floor surface F being “upward”. It is to be noted that these directions are names used merely for explanation, and do not limit the actual positional relationships and directions.
- The vacuum cleaner A according to an example embodiment of the present disclosure will be described.
FIG. 1 is a perspective view of the vacuum cleaner A according to an example embodiment of the present disclosure. The vacuum cleaner A is a so-called stick type electric vacuum cleaner, and includes achassis 102 having anintake portion 103 and anexhaust portion 104 formed on a lower surface and an upper surface, respectively. A power cord (not shown) is led out from the rear surface of thechassis 102. The power cord is connected to a power outlet (not shown) provided on the side wall surface of the living room, and supplies power to the vacuum cleaner A. It is to be noted that the vacuum cleaner A may be a so-called robot type, canister type, or handy type vacuum cleaner. - An air passage (not shown) connecting the
intake portion 103 and theexhaust portion 104 is formed in thechassis 102. A dust collecting portion (not shown), a filter (not shown), and the blower B are arranged in order from the upstream side toward the downstream side in the air passage. The blower B has animpeller 2 described later. Dust contained in gas flowing in the air passage is captured by the filter and collected in a dust collecting portion formed in a container shape. The dust collecting portion and the filter are configured removably to thechassis 102. - A
grip portion 105 and anoperation portion 106 are provided on the upper portion of thechassis 102. The user can move the vacuum cleaner A by gripping thegrip portion 105. Theoperation portion 106 has a plurality ofbuttons 106 a, and performs operation setting of the vacuum cleaner A by the operation of thebuttons 106 a. For example, the operation of thebuttons 106 a gives the blower B instructions of starting driving, stopping driving, and changing the number of rotations. The downstream end (upper end of the figure) of a rod-shaped suction pipe 107 is connected to theintake portion 103. Asuction nozzle 108 is removably attached to thesuction pipe 107 at the upstream end of thesuction pipe 107. Dust on the floor surface F is sucked into thesuction pipe 107 through thesuction nozzle 108. The vacuum cleaner A has the blower B described later. This can improve the blowing efficiency of the blower B mounted on the vacuum cleaner A. -
FIG. 2 is a perspective view of the blower B according to an example embodiment of the present disclosure, andFIG. 3 is a longitudinal cross-sectional view of the blower B according to an example embodiment of the present disclosure.FIG. 3 is a longitudinal cross-sectional view of an imaginary cross section A-A inFIG. 2 . - As shown in
FIGS. 2 and 3 , the blower B has a motor 1, theimpeller 2, and ahousing 3. The motor 1 is a so-called inner rotor type motor. - The motor 1 has a
stator 11, arotor 12, amotor housing 13, abearing 14, and asubstrate 15. Therotor 12 is rotatable about the vertically extending central axis J and radially faces thestator 11. Themotor housing 13 surrounds at least a part of thestator 11 and therotor 12. - The
stator 11 has astator core 111, aninsulator 112, and acoil 113. Thestator core 111 is made of a magnetic material and has an annular core back and a teeth portion extending radially inward from the core back. At least a part of the teeth portion is surrounded by theinsulator 112. Thecoil 113 is formed by winding a conductive wire around the teeth portion via theinsulator 112. - The
rotor 12 has ashaft 121, amagnet 122, anupper spacer 123, and alower spacer 124. Theshaft 121 is arranged along the central axis J. Themagnet 122 is fixed to theshaft 121 and radially faces the radial inner end of portion the teeth portion. Theupper spacer 123 and thelower spacer 124 are fixed to theshaft 121, respectively. The upper surface of themagnet 122 is in contact with the lower surface of theupper spacer 123, and the lower surface of themagnet 122 is in contact with the upper surface of thelower spacer 124. Themagnet 122 is fixed by being axially sandwiched by theupper spacer 123 and thelower spacer 124. - The
motor housing 13 has anupper motor housing 131, alower motor housing 132, and a fixingmember 133. Thelower motor housing 132 is arranged downward relative to theupper motor housing 131. Theupper motor housing 131 and thelower motor housing 132 surround at least a part of thestator 11 and therotor 12, respectively. Thestator core 111, theupper motor housing 131, and thelower motor housing 132 are fixed by the fixingmember 133. In the present embodiment, the fixingmember 133 is a screw. - The
bearing 14 includes anupper bearing 141 and alower bearing 142. Theupper bearing 141 and thelower bearing 142 are fixed to theupper motor housing 131 and thelower motor housing 132, respectively, and rotatably support theshaft 121 around the central axis J. - The
substrate 15 is arranged downward relative to thestator core 111. Anelectronic component 151 is arranged on the upper surface of thesubstrate 15. Theelectronic component 151 is, for example, a capacitor, an FET, or the like. Thesubstrate 15 is fixed to thelower motor housing 132 by a fixingmember 152. - The
impeller 2 has abase portion 21, afirst blade 22, and asecond blade 23. Theimpeller 2 is fixed to theshaft 121. A downward extendingcylindrical hub 211 is arranged on the lower surface of thebase portion 21. Thehub 211 is provided with an upwardly recessed recess portion, and the upper end portion of theshaft 121 is fixed in a state of being inserted into the recess portion. Thus, theimpeller 2 is rotatable about the central axis J integrally with theshaft 121. That is, theimpeller 2 is rotatable about the vertically extending central axis J. - The
housing 3 has animpeller cover 31, anouter housing 32, and aninner housing 33. Theimpeller cover 31 surrounds at least a part of theimpeller 2 upward and radially outward. The center of theimpeller cover 31 is provided with an axiallyopening intake port 311. Theimpeller cover 31 has acurved surface portion 312 extending radially outward as it extends downward, and acylindrical portion 313 extending downward from the radial outer edge of the curved surface portion. - The
outer housing 32 is an axially extending cylindrical portion. The upper end portion of theouter housing 32 is fixed to thecylindrical portion 313. The lower end portion of theouter housing 32 is fixed to thelower motor housing 132. Theinner housing 33 is arranged radially inward of theouter housing 32. Theinner housing 33 has atop plate portion 331 arranged downward of thebase portion 21 and stretching in a direction intersecting with the central axis J, and acylindrical portion 332 extending downward from the radial outer edge of the top plate portion. A flow path is formed in the radial direction between a radial inner surface of theouter housing 32 and a radial outer surface of thecylindrical portion 332. - The gas sucked into the
impeller cover 31 from theintake port 311 is discharged downward and radially outward by theimpeller 2, flows downward in the flow path between theouter housing 32 and thecylindrical portion 332, flows along the radial inner surface of thelower motor housing 132, and is then discharged to the external space of the blower B. The blower B has theimpeller 2. This improves the blowing efficiency of the blower B. -
FIG. 4 is a perspective view of theimpeller 2 according to an example embodiment of the present disclosure,FIG. 5 is a front view of theimpeller 2 according to an example embodiment of the present disclosure,FIG. 6 is a plan view of theimpeller 2 according to an example embodiment of the present disclosure,FIG. 7 is a longitudinal cross-sectional view of thenimpeller 2 according to an example embodiment of the present disclosure, andFIG. 8 is a perspective view of theimpeller 2 according to an example embodiment of the present disclosure.FIGS. 4 and 8 are a perspective view of theimpeller 2 viewed from the upward and a perspective view of theimpeller 2 viewed from the downward, respectively.FIG. 7 is a longitudinal cross-sectional view of the impeller in a case of being cut by an imaginary cross section B-B inFIG. 6 . - Hereinafter, the structure of the
impeller 2 will be described in detail with reference toFIGS. 4 to 8 . Theimpeller 2 is a so-called mixed flow type three-dimensional impeller. Theimpeller 2 is rotatable about the vertically extending central axis J. Theimpeller 2 has thebase portion 21, the plurality offirst blades 22, and the plurality ofsecond blades 23. Thefirst blade 22 is a so-called main blade, and thesecond blade 23 is a so-called auxiliary blade. Thebase portion 21 stretches radially outward as it extends downward. As shown inFIGS. 7 and 8 , the downward extendingcylindrical hub 211 is formed in the central portion of the lower surface of thebase portion 21. The axial thickness of thebase portion 21 is substantially constant radially outward relative to thehub 211. Therefore, an upwardly recessedrecess portion 212 is formed downward of thebase portion 21 radially outward relative to thehub 211. - As shown in
FIGS. 4 to 8 , the plurality offirst blades 22 are circumferentially arrayed on the upper surface of thebase portion 21. The plurality offirst blades 22 extend on one side in a circumferential direction C as it extends upward. Here, the one side in the circumferential direction C is the forward in the rotation direction of theimpeller 2, and the other side in the circumferential direction C is the backward in the rotation direction of theimpeller 2. A radialinner edge 221 of thefirst blade 22 extends upward as it extends radially outward. This enlarges the area of thefirst blade 22, thereby improving the blowing efficiency. That is, the blowing efficiency is improved because the area of the pressure surface of thefirst blade 22 becomes larger as compared with a case where the radialinner edge 221 extends radially outward along a plane orthogonal to the central axis J, for example. As shown inFIG. 5 , the radialinner edge 221 extends in the normal direction on the upper surface of thebase portion 21. - As shown in
FIG. 6 , in planar view, the radialinner edge 221 of thefirst blade 22 is arranged along an imaginary line L radiating from the central axis J. That is, the radialinner edge 221 extends radially. This can enlarge the area of a space formed in between the circumferential direction C of the radialinner edges 221 of the adjacentfirst blades 22, thereby improving the blowing efficiency. In theimpeller 2 having the above-described characteristics, the area of the space formed in between the circumferential direction C of the radialinner edges 221 adjacent in the circumferential direction C can be enlarged as compared with a case where the radial inner edge is curved on one side in the circumferential direction C as it extends radially outward in planar view, for example. - A radial
outer edge 223 of thefirst blade 22 extends upward as it extends radially outward. This enlarges the area of thefirst blade 22, thereby improving the blowing efficiency. That is, the blowing efficiency is improved because the area of the pressure surface of thefirst blade 22 becomes larger as compared with a case where the radial outer edge extends upward along a direction parallel to the central axis J, for example. As shown inFIG. 5 , the radialouter edge 223 extends in the normal direction on the upper surface of thebase portion 21. - As shown in
FIGS. 4 and 5 , the upper edge of the first blade does not have a constant radius of curvature, but the radius of curvature differs depending on anupper edge 226 portion of thefirst blade 22. More specifically, when thefirst blade 22 is viewed from the radial outward, the upper portion of theupper edge 226 of thefirst blade 22 is a curved surface protruding to the other side in the circumferential direction C, and the lower portion of theupper edge 226 of thefirst blade 22 is a curved surface protruding to one side in the circumferential direction C. That is, when thefirst blade 22 is viewed from the radial outward, the upper portion of theupper edge 226 is curved so as to expand to the other side in the circumferential direction C, and the lower portion of theupper edge 226 is curved so as to expand to one side in the circumferential direction C. This allows gas to be sucked along the curved surface protruding to the other side in the circumferential direction C in the upper portion of thefirst blade 22, and the suction efficiency to be improved. Furthermore, it is possible to discharge gas radially outward and downward along the curved surface protruding to one side in the circumferential direction C in the lower portion of thefirst blade 22, thereby improving the blowing efficiency. - The plurality of
second blades 23 are arranged in between the circumferential direction of thefirst blades 22 adjacent in the circumferential direction C. The plurality ofsecond blades 23 extend on one side in a circumferential direction C as it extends upward. A radialinner edge 231 of thesecond blade 23 extends upward as it extends radially outward. This enlarges the area of thesecond blade 23, thereby improving the blowing efficiency. That is, the blowing efficiency is improved because the area of the pressure surface of thesecond blade 23 becomes larger than that in a case where the radialinner edge 231 extends radially outward along a plane orthogonal to the central axis J, for example. - In planar view, the radial
inner edge 231 of thesecond blade 23 is arranged on one side in the circumferential direction C as it extends radially outward. In the present embodiment, the radialinner edge 231 is a line-segment-shaped portion extending in a direction inclined to one side of the circumferential direction C relative to the normal direction of thebase portion 21. This results in an increase in the area of thesecond blade 23, thereby improving the blowing efficiency. That is, the blowing efficiency is improved because the area of the pressure surface of thesecond blade 23 becomes larger than that in a case where the radialinner edge 231 extends in the normal direction of thebase portion 21, for example. - In planar view, a radial
outer end 237 at the radialinner edge 231 of at least one of thesecond blades 23 is arranged on the imaginary line L. More specifically, the radialouter end 237 at the radialinner edge 231 of thesecond blade 23 adjacent to one side in the circumferential direction C of a certainfirst blade 22 is arranged on the imaginary line L connecting the central axis J and the radialinner edge 221 of thefirst blade 22. Due to this, the radialouter end 237 of the radialinner edge 231 is arranged on the imaginary line L that overlaps the radialinner edge 221 of thefirst blade 22, and hence gas smoothly flows on both the pressure surface side and the negative pressure side of thesecond blade 23, thereby improving the blowing efficiency. It is to be noted that in the present embodiment, the radialouter end 237 at the radialinner edge 231 of thesecond blade 23 adjacent to one side in the circumferential direction C of all thefirst blades 22 is arranged on the imaginary line L connecting the central axis J and the radialinner edge 221 of thefirst blade 22 arranged on the other side in the circumferential direction C of the respectivesecond blades 23. In addition, in the present embodiment, the radialouter end 237 at the radialinner edge 231 is a portion identical to anupper end 232 of thesecond blade 23. - A radial
outer edge 233 of thesecond blade 23 extends upward as it extends radially outward. This enlarges the area of thesecond blade 23, thereby improving the blowing efficiency. That is, the blowing efficiency is improved because the area of the pressure surface of thesecond blade 23 becomes larger than that in a case where the radialouter edge 233 extends upward along a direction parallel to the central axis J, for example. As shown inFIG. 5 , the radialouter edge 233 extends in the normal direction on the upper surface of thebase portion 21. - As shown in
FIGS. 4 and 5 , when thesecond blade 23 is viewed from the radial outward, anupper edge 236 of thesecond blade 23 is a curved surface protruding to one side in the circumferential direction C. That is, when thesecond blade 23 is viewed from the radial outward, theupper edge 236 is curved so as to expand to one side in the circumferential direction C. This makes it possible to discharge gas radially outward and downward along the curved surface protruding to one side in the circumferential direction C in thesecond blade 23, thereby improving the blowing efficiency. Furthermore, unlike thefirst blade 22, theupper edge 236 of thesecond blade 23 is a curved surface protruding to one side in the circumferential direction C overall. In the present embodiment, thesecond blade 23 is shorter in longitudinal length than thefirst blade 22. However, because theupper edge 236 of the second blade is not formed with a curved surface protruding to the other side in the circumferential direction C, no unevenness is formed on the positive pressure surface side of thesecond blade 23, and it is hence possible to suppress the gas flowing to the positive pressure surface side of thesecond blade 23 from being separated from the positive pressure surface, and a vortex from being generated. - As shown in
FIGS. 4 to 6 , a radialouter end 234 of thesecond blade 23 is arranged on one side in the circumferential direction C relative to a middle 24 in the circumferential direction C of a radialouter end 224 at thefirst blade 22 adjacent in the circumferential direction C. This improves the blowing efficiency at theimpeller 2. That is, in theimpeller 2 of the present embodiment, the blowing efficiency is improved as compared with a case where the radialouter end 234 of thesecond blade 23 is arranged in the vicinity of the middle in the circumferential C of the radialouter end 224 of thefirst blade 22 adjacent in the circumferential direction C, for example. In the present embodiment, the length in the circumferential direction C between the radialouter end 234 of a certainsecond blade 23 and the radialouter end 224 of thefirst blade 22 adjacent to the other side in the circumferential direction C of thesecond blade 23 is about twice the length in the circumferential direction C between the radialouter end 234 of thesecond blade 23 and the radialouter end 224 of thefirst blade 22 adjacent to one side in the circumferential direction C of thesecond blade 23. - In the present embodiment, the radial outer ends 224 of the
first blade 22 are arranged at equal intervals in the circumferential direction C. In addition, the radial outer ends 234 of thesecond blade 23 are also arranged at equal intervals in the circumferential direction C. This improves the rotational balance of theimpeller 2. This allows theimpeller 2 to accurately rotate about the central axis J even in a case where theimpeller 2 rotates at a high speed. - As shown in
FIG. 6 , thefirst blade 22 is connected with thebase portion 21 in afirst connection region 25, and thesecond blade 23 is connected with thebase portion 21 in asecond connection region 26. In the present embodiment, thebase portion 21 is a substantially conical portion. Therefore, thefirst connection region 25 and thesecond connection region 26 are boundaries between portions where thefirst blade 22 and thesecond blade 23 extend, with the upper surface of thebase portion 21 forming a substantially conical surface as a reference. - In planar view, the curvatures of the
first connection region 25 and thesecond connection region 26 are not constant. In addition, the curvature of thefirst connection region 25 is larger than the curvature of thesecond connection region 26. More specifically, in planar view, the minimum value of a radius R1 of curvature in thefirst connection region 25 of thebase portion 21 and the surface of the other side in the circumferential direction C of thefirst blade 22 is smaller than the minimum value of a radius R2 of curvature in thesecond connection region 26 of thebase portion 21 and the surface of the other side in the circumferential direction C of thesecond blade 23. This can suppress the gas flowing in the vicinity of thefirst connection region 25 and thesecond connection region 26 from being separated from the negative pressure surfaces of thefirst blade 22 and thesecond blade 23, thereby improving the blowing efficiency of theimpeller 2. - As shown in
FIG. 5 , in the present embodiment, alower end 225 of thefirst blade 22 and alower end 235 of thesecond blade 23 have the same axial position. An axial length L2 of thesecond blade 23 is longer than half of an axial length L1 of thefirst blade 22. In other words, when theimpeller 2 is viewed from the radial outward, theupper end 232 of thesecond blade 23 is arranged upward relative to anaxial midpoint 27 between anupper end 222 of thefirst blade 22 and thelower end 225 of thefirst blade 22. Here, the axial length L1 of thefirst blade 22 is the length in the axial direction from thelower end 225 to theupper end 222 of thefirst blade 22. The axial length L2 of thesecond blade 23 is the length in the axial direction from thelower end 235 to theupper end 232 of thesecond blade 23. Due to this, the gas flowing in between the circumferential direction C of thefirst blades 22 adjacent in the circumferential direction C can be guided along the pressure surface or the negative pressure surface of thesecond blades 23 as upward as possible, thereby allowing generation of turbulence to be suppressed. - The present disclosure can be used in an impeller, for example. Furthermore, the impeller of the present disclosure can also be used in a blower or a vacuum cleaner. In addition, the present disclosure can be used in other electrical apparatuses.
- Features of the above-described preferred embodiments and the modifications thereof may be combined appropriately as long as no conflict arises.
- While example embodiments of the present disclosure have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present disclosure. The scope of the present disclosure, therefore, is to be determined solely by the following claims.
Claims (15)
1. An impeller that is rotatable about a vertically extending central axis, the impeller comprising:
a base portion extending radially outward as it extends downward;
a plurality of first blades circumferentially arrayed on an upper surface of the base portion and extending on one side in a circumferential direction as it extends upward; and
a plurality of second blades between a circumferential direction of the circumferentially adjacent first blades and extending on one side in a circumferential direction as it extends upward; wherein
a radial outer end of the second blade is on one side in a circumferential direction relative to a middle in a circumferential direction of a radial outer end of the circumferentially adjacent first blade.
2. The impeller according to claim 1 , wherein a radial inner edge of the first blade extends upward as it extends radially outward.
3. The impeller according to claim 1 , wherein a radial outer edge of the first blade extends upward as it extends radially outward.
4. The impeller according to claim 1 , wherein when the first blade is viewed from a radial outward, an upper portion of an upper edge of the first blade is a curved surface protruding to another side in a circumferential direction, and a lower portion of the upper edge of the first blade is a curved surface protruding to the one side in the circumferential direction.
5. The impeller according to claim 1 , wherein a radial inner edge of the second blade extends upward as it extends radially outward.
6. The impeller according to claim 1 , wherein a radial outer edge of the second blade extends upward as it extends radially outward.
7. The impeller according to claim 1 , wherein in a planar view, the radial inner edge of the second blade is on the one side of the circumferential direction as it extends radially outward.
8. The impeller according to claim 1 , wherein when the second blade is viewed from a radial outward direction, an upper edge of the second blade is a curved surface protruding to the one side in the circumferential direction.
9. The impeller according to claim 1 , wherein in a planar view, a radial inner edge of the first blade extends along an imaginary line radiating from a central axis.
10. The impeller according to claim 9 , wherein in a planar view, a radial outer end at a radial inner edge of at least one of the second blades is on the imaginary line.
11. The impeller according to claim 1 , wherein when the impeller is viewed from a radial outward direction, an upper end of the second blade is located above an axial midpoint between an upper end of the first blade and a lower end of the first blade.
12. The impeller according to claim 1 , wherein in a planar view, a minimum value of a radius of curvature in a first connection region of the base portion and a surface of another side in a circumferential direction of the first blade is smaller than a minimum value of a radius of curvature in a second connection region of the base portion and a surface of another side in a circumferential direction of the second blade.
13. The impeller according to claim 1 , wherein radial outer ends of the first blade are located at equal intervals in a circumferential direction, and radial outer ends of the second blade are located at equal intervals in a circumferential direction.
14. A blower, comprising
the impeller according to claim 1 .
15. A vacuum cleaner, comprising
the blower according to claim 14 .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/890,080 US20200378398A1 (en) | 2019-06-03 | 2020-06-02 | Impeller, blower, and vacuum cleaner |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201962856274P | 2019-06-03 | 2019-06-03 | |
JP2020079489A JP2020197214A (en) | 2019-06-03 | 2020-04-28 | Impeller, blower and cleaner |
JP2020-079489 | 2020-04-28 | ||
US16/890,080 US20200378398A1 (en) | 2019-06-03 | 2020-06-02 | Impeller, blower, and vacuum cleaner |
Publications (1)
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US20200378398A1 true US20200378398A1 (en) | 2020-12-03 |
Family
ID=73550659
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US16/890,080 Abandoned US20200378398A1 (en) | 2019-06-03 | 2020-06-02 | Impeller, blower, and vacuum cleaner |
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US (1) | US20200378398A1 (en) |
CN (1) | CN112032103B (en) |
Citations (2)
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US9416664B2 (en) * | 2013-01-09 | 2016-08-16 | Fanuc Corporation | Method of formation of impeller with shape defined by plurality of lines and such impeller |
US11089931B2 (en) * | 2017-03-06 | 2021-08-17 | Samsung Electronics Co., Ltd. | Fan unit and cleaner having the same |
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EP2058525B1 (en) * | 2007-11-12 | 2010-04-28 | Elica S.P.A. | Impeller for a radial fan and radial fan |
JP2010261392A (en) * | 2009-05-08 | 2010-11-18 | Mitsubishi Electric Corp | Electric blower and vacuum cleaner using the same |
CN101893003B (en) * | 2010-05-31 | 2012-02-22 | 宋波 | 3-D impeller of high-load centrifugal compressor |
JP5606515B2 (en) * | 2012-12-13 | 2014-10-15 | 三菱重工業株式会社 | Compressor |
CN103062112B (en) * | 2013-01-10 | 2016-07-20 | 中联重科股份有限公司 | Road cleaning equipment and centrifugal blower fan blade wheel thereof |
CN203384065U (en) * | 2013-06-04 | 2014-01-08 | 上海布威重工机械有限公司 | Multi-vane fan |
CN203362608U (en) * | 2013-06-24 | 2013-12-25 | 浙江理工大学 | Bladeless fan turbine gear with splitter vanes |
CN104251230B (en) * | 2013-06-28 | 2016-09-14 | 苏州宝时得电动工具有限公司 | Receded disk impeller and include the suction and blowing device of this receded disk impeller |
JP6390272B2 (en) * | 2014-08-29 | 2018-09-19 | 日本電産株式会社 | Impeller and blower |
JP2016108994A (en) * | 2014-12-04 | 2016-06-20 | 株式会社Ihi | Compressor impeller, centrifugal compressor, and supercharger |
CN206221359U (en) * | 2016-11-23 | 2017-06-06 | 广东威灵电机制造有限公司 | Impeller for blower fan and the blower fan with it |
JP2019024276A (en) * | 2017-07-21 | 2019-02-14 | 日本電産株式会社 | Notor, blower, and cleaner |
CN207892888U (en) * | 2017-10-25 | 2018-09-21 | 莱克电气股份有限公司 | A kind of dust catcher noise reduction movable vane wheel and dust catcher |
CN207554416U (en) * | 2017-12-04 | 2018-06-29 | 中国人民解放军总参谋部第六十研究所 | A kind of centrifugal impeller of splitterr vanes |
CN109099006A (en) * | 2018-07-20 | 2018-12-28 | 中车唐山机车车辆有限公司 | impeller, blower and rail vehicle |
-
2020
- 2020-06-01 CN CN202010483121.1A patent/CN112032103B/en active Active
- 2020-06-02 US US16/890,080 patent/US20200378398A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9416664B2 (en) * | 2013-01-09 | 2016-08-16 | Fanuc Corporation | Method of formation of impeller with shape defined by plurality of lines and such impeller |
US11089931B2 (en) * | 2017-03-06 | 2021-08-17 | Samsung Electronics Co., Ltd. | Fan unit and cleaner having the same |
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CN112032103B (en) | 2022-08-26 |
CN112032103A (en) | 2020-12-04 |
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