EP2441962A1 - Impeller, and electric blower and electric cleaner provided with impeller - Google Patents
Impeller, and electric blower and electric cleaner provided with impeller Download PDFInfo
- Publication number
- EP2441962A1 EP2441962A1 EP11791190A EP11791190A EP2441962A1 EP 2441962 A1 EP2441962 A1 EP 2441962A1 EP 11791190 A EP11791190 A EP 11791190A EP 11791190 A EP11791190 A EP 11791190A EP 2441962 A1 EP2441962 A1 EP 2441962A1
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- EP
- European Patent Office
- Prior art keywords
- inducer
- impeller
- section
- shroud
- front shroud
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- 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.)
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Classifications
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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
- F04D29/285—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors the compressor wheel comprising a pair of rotatable bladed hub portions axially aligned and clamped together
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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
- 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
Definitions
- the present invention relates to an impeller and an electric blower, an electric vacuum cleaner equipped with the same impeller.
- Blowing performance suction performance of an electric blower used in an electric vacuum cleaner has been tried to improve specifically with respect to the impeller of the blower.
- a structure formed of a front shroud, a rear shroud, multiple blades, and an inducer having multiple vane sections has been proposed (e.g. refer to Patent Literature 1).
- Fig. 11 is a partially cut-away perspective view for illustrating a structure of the conventional impeller discussed above.
- impeller 321 includes rear shroud 322, front shroud 323, sheet metal blades 324, and resinous inducer 325.
- Rear shroud 322 is made of sheet metal.
- Front shroud 323 is disposed separately from rear shroud 322 with a space therebetween and having suction port 323a at its center.
- Multiple sheet metal blades 324 are held by and between rear shroud 322 and front shroud 323.
- Inducer 325 made of resin is disposed correspondingly to suction port 323a.
- Resinous inducer 325 includes conical hub 325b and vane sections 325a formed on hub 325b. Vane sections 325a have a three-dimensional curve for rectifying the air flowing from suction port 323a to sheet metal blades 324.
- Fig. 12A is a plan view illustrating the movement of a mold during the molding of resinous inducer 325 of the conventional impeller 321.
- Fig. 12B is a lateral view illustrating this movements.
- resinous inducer 325 is formed through a resin molding process using laterally-sliding mold 331 that slides radially toward the outer circumference of vane section 325a.
- the mold includes laterally-sliding mold 331, upward-sliding mold 332, and downward-sliding mold 333.
- Molds 331 in equal numbers to that of vanes of vane sections 325a are prepared.
- Upward-sliding mold 332 in equal numbers to that of vanes of vane sections 325a are prepared.
- Downward-sliding mold 333 in equal numbers to that of vanes of vane sections 325a are prepared.
- vane sections 325a of resinous inducer 325 in numbers of six and metal sheet blades 324 in numbers of also six are ideal quantities for improving the blowing (sucking) efficiency of impeller 321 of the conventional electric blower.
- a numbers over the six for vane sections 325a as well as for metal sheet blades 324 can sometimes gain the better blowing efficiency depending on an air volume and an rpm.
- a high frequency tone which is a kind of noises generated by the electric blower, is generated conspicuously at the frequency of a product of multiplying the number of vanes (numbers of vane sections 325a and the number of metal sheet blades 324) of impeller 321 by the rpm.
- the frequency of the high frequency tone generated by the electric blower is audible frequency band to users, so that the tone sounds harshly and sometimes makes the users unpleasant.
- the method of molding resinous inducer 325 of impeller 321 of the conventional electric blower finds it difficult to mold inducer 325 having 6 or more than 6 vanes, and in a case where an end face of front shroud 323 side of a vane section 325a overlaps, viewed from the top or the side, with an end face of metal sheet blade 324 of the adjacent vane section 325a, the molding becomes also difficult.
- Patent Literature 1 Unexamined Japanese Patent Application Publication No. 2000 - 45993
- the present invention aims to provide an impeller for an electric blower, where vanes of an inducer of this impeller can be multiplied with ease and improving the blowing efficiency as well as lowering the noise, and the present invention also aims to provide the electric blower and an electric vacuum cleaner both equipped with this impeller.
- the impeller of the present invention includes a front shroud having a first opening at its center section, a rear shroud disposed separately from the front shroud with a space therebetween, multiple blades held by and between the front and rear shrouds and extending from a center section toward an outer circumference of the rear shroud, and an inducer disposed at the center section of the rear shroud.
- the inducer includes an upper inducer disposed at the front shroud side and a lower inducer disposed at the rear shroud side.
- the impeller of the present invention allows the inducer to be equipped with multiple vane sections with ease and improving the blowing efficiency and lowering the noises.
- impeller 1 in accordance with the first embodiment of the present invention and also electric blower 100 equipped with impeller 1.
- Fig. 1 is a sectional view partially illustrating a structure of electric blower 100 equipped with impeller 1 in accordance with the first embodiment of the present invention.
- Fig. 2 is a partially cut-away perspective view illustrating a structure of impeller 1 in accordance with the first embodiment of the present invention.
- Fig. 3 is an exploded perspective view illustrating a structure of impeller 1 in accordance with the first embodiment of the present invention.
- Fig. 4 is a sectional view illustrating a structure of impeller 1 in accordance with the first embodiment of the present invention.
- electric blower 100 includes impeller 1, air guide 2, fan case 3, motor 4, and bracket 6 disposed on a counter-load side.
- Impeller 1 generates an air current (suction air).
- Air guide 2 is disposed confronting an outer rim of impeller 1 for rectifying the air current supplied from impeller 1.
- Fan case 3 accommodates impeller 1 and air guide 2 therein.
- Motor 4 drives impeller 1.
- Bracket 6 disposed at counter-load side is placed on the outer wall of motor 4, and fan case 3 is mounted to bracket 6 hermetically.
- Impeller 1 is supported by shaft 5 of motor 4.
- Counter-load side bracket 6 includes exhausting opening 7 for exhausting the air sucked by impeller 1.
- impeller 1 includes front shroud 20, rear shroud 21, multiple blades 22, and inducer 23.
- Front shroud 20 includes a first opening, i.e. suction port 20a, at its center section.
- Rear shroud 21 is disposed separately from front shroud 20 with a space therebetween.
- Multiple blades 22 are held by and between front shroud 20 and rear shroud 21, and extend from the center section toward the outer circumference (rim) of rear shroud 21.
- Inducer 23 is disposed at the center section of rear shroud 21, and is held by and between front shroud 20 and rear shroud 21.
- Each one of blades 22 has multiple mating protrusions 22a and 22b respectively on its faces to be brought into contact with front shroud 20 and rear shroud 21.
- Front shroud 20 and rear shroud 21 have multiple mating slits 20b and 21a for receiving mating protrusions 22a and 22b respectively.
- Mating protrusions 22a and 22b are inserted into slits 20b and 21a respectively, and they are crimped together, whereby each blade 22 can be mounted to front shroud 20 and rear shroud 21.
- Inducer 23 is split into upper inducer 24 and lower inducer 27 with a plane in parallel to rear shroud 21, namely, the plane vertical relative to shaft 5 of motor 4.
- Upper inducer 24 stays on front shroud 20 side
- lower inducer 27 stays on rear shroud 21 side.
- Inducer 23 is formed this way: end face P1 on front shroud 20 side of a vane section of inducer 23 overlaps with end face P2 on blade 22 side of a vane section of the adjacent inducer 23, and this overlap is viewed from a top or a lateral view. In other words, this form is difficult for a conventional molding method to mold.
- upper inducer 24 includes ring section 25 having second opening 25a at the center and multiple first vane sections 26 extending from ring section 25 toward the outer circumference (rim) of inducer 23.
- Lower inducer 27 includes base section 28, multiple second vane sections 29, and shaft section 30.
- Base section 28 is mounted to rear shroud 21 and forms a conical shape.
- Second vane sections 29 extend from the center section of base section 28 toward the outer rim thereof.
- Shaft section 30 extends from the center section of base section 28 toward upper inducer 24, and fits into ring section 25.
- lower inducer 27 and rear shroud 21 have third opening 27a and fourth opening 21b at their centers for receiving shaft 5 of motor 4 respectively.
- Shaft 5 of motor 4 is fit into and supported by third opening 27a and fourth opening 21b, whereby impeller 1 can be driven by motor 4.
- projection 30a is formed on shaft section 30 of lower inducer 27 at base section 28 side.
- Recess 25b is formed on ring section 25 of upper inducer 24 at lower inducer 27 side, and recess 25b mates with projection 30a.
- Upper inducer 24 is thus positioned relative to and mounted to lower inducer 27 by using projection 30a and recess 25b.
- Upper inducer 24 and lower inducer 27 form inducer 23. and ring section 25 of upper inducer 24 fits into shaft section 30 of lower inducer 27, whereby upper inducer 24 is positioned relative to and mounted to lower inducer 27. This simple structure allows holding upper inducer 24 and lower inducer 27 together more firmly.
- First vane sections 26 of upper inducer 24 and second vane sections 29 of lower inducer 27 form the vane sections of inducer 23.
- ring section 25 of upper inducer 24 and shaft section 30 of lower inducer 27 are formed such that plane P3 on outer wall of ring 25 forming the same plane of plane P4 of base section 28 of lower inducer 27 at front shroud 20 side when upper inducer 24 is mounted to lower inducer 27.
- the number of first vane sections 26 of upper inducer 24, the number of second vane sections 29 of lower inducer 27, and the number of blades 22 are determined nine (9) respectively considering the air volume of electric blower 100 and the rpm of impeller 1.
- Front shroud 20, rear shroud 21 and blades 22 are made of metal, and inducer 23 is made of resin.
- Fig. 5A is a plan view illustrating a structure of a mold for lower inducer 27 of impeller 1 in accordance with the first embodiment of the present invention.
- Fig. 5B is a lateral view of this mold structure.
- Fig. 6A is a plan view illustrating a structure of a mold for upper inducer 24 of impeller 1 in accordance with the first embodiment of the present invention.
- Fig. 6B is a lateral view of this mold structure.
- the mold of lower inducer 27 has angular intervals of 40 degrees, and includes sliding molds 31 disposed in nine directions, core 32 for molding lower inducer 27 from the top, and cavity 33 for molding lower inducer 27 from the bottom.
- Inducer 23 has this structure therein: end face P1 on a vane section of inducer 23 at front shroud 20 side overlaps with end face P2 on a vane section of the adjacent inducer 23 at blade 22 side, and this overlap is viewed from the top face or the lateral face.
- inducer 23 is split into upper inducer 24 and lower inducer 27, the mold structure discussed above allows molding this inducer 23.
- the mold for upper inducer 24 includes core 42 for molding upper inducer 24 from the top and cavity 43 for molding upper inducer 24 from the bottom.
- inducer 23 As discussed previously, it is difficult for inducer 23 with a conventional structure and a conventional molding method to have multiple vane sections.
- inducer 23 is held by and between front shroud 20 and rear shroud 21, inducer 23 can be held firmly with this simple structure. Inducer 23 can have multiple vane sections with ease as discussed above. Use of impeller 1 in accordance with this first embodiment allows electric blower 100 to improve the blowing efficiency and lower the noises.
- Impeller 51 in accordance with the second embodiment of the present invention is demonstrated hereinafter.
- Fig. 7 is a sectional view illustrating a structure of impeller 51.
- groove section 34 is provided on a perimeter of front shroud 20 at a position where first vane section 26 is brought into contact with second vane section 29.
- Groove section 34 has a shape similar to an end face of the first vane section 26 and the second vane section 29 which are brought into contact with each other at groove section 34 of front shroud 20, and groove section 34 has a width almost equal to that of this end face.
- This structure i.e. groove section 34, allows front shroud 20 to hold inducer 23 more firmly.
- Groove section 34 also allows correcting warp or deformation produced during the molding of inducer 23 by internal stress.
- impeller 51 in accordance with the second embodiment allows inducer 23 to have multiple vane sections with ease. Electric blower 100 can thus improve the blowing efficiency and lower the noises.
- Impeller 52 in accordance with the third embodiment of the present invention is demonstrated hereinafter.
- Impeller 52 in accordance with the third embodiment of the present invention is demonstrated hereinafter with reference to Fig. 8 which is a sectional view illustrating a structure of impeller 52. Similar elements to those of impeller 1 and impeller 51 discussed in embodiments 1 and 2 have the same reference marks, and the descriptions thereof are omitted here.
- second vane section 29 includes projection 29a extending from an end face, contacting with front shroud 20, toward front shroud 20.
- Front shroud 20 includes hole 20c at a place corresponding to projection 29a for receiving projection 29a.
- Inducer 23 is rigidly mounted to front shroud 20 by inserting projection 29a of second vane section 29 into hole 20c of front shroud 20 and welding them together.
- projection 29a is formed on second vane section 29; however, the present invention is not limited to this structure.
- projection 29a can be formed on first vane section 26, or it can be formed on both first vane section 26 and second vane section 29.
- Impeller 53 in accordance with the fourth embodiment of the present invention is demonstrated hereinafter.
- Impeller 53 in accordance with the fourth embodiment of the present invention is demonstrated hereinafter with reference to Fig. 9 which is a sectional view illustrating a structure around the center of impeller 53.
- tab 30b is formed around the end face of shaft section 30 of lower inducer 27 at front shroud 20 side, and tab 30b is received like a stopper on ring section 25 of upper inducer 24 at front shroud 20 side.
- This structure allows upper inducer 24 to hold lower inducer 24 more firmly along the shaft direction, so that inducer 23 can be equipped with multiple vane sections with ease.
- use of impeller 53 in accordance with the fourth embodiment allows electric blower 100 to improve the blowing efficiency and lower the noises.
- Electric vacuum cleaner 200 in accordance with the fifth embodiment of the present invention is demonstrated hereinafter.
- Electric vacuum cleaner 200 in accordance with the fifth embodiment of the present invention is demonstrated hereinafter with reference to Fig. 10 which schematically shows vacuum cleaner 200. Similar elements to those used in embodiments 1 - 4 have the same reference marks, and the descriptions thereof are omitted here.
- cleaner 200 includes main body 201, intake tool 202 for sucking dust from a target surface for cleaning, hose 203 of which first end is hooked up to main body 201, extension tube 204 of which first end is connected to hose 203 and the other end is connected to intake tool 202.
- Manual operation section 205 is provided to an end section on hose 203 at extension tube 204 side.
- Main body 201 includes one of impellers 1, 51, 52, 53 demonstrated in embodiments 1 - 4, electric blower 100 for generating suction air, and dust collector 206 placed on upstream side of blower 100 for collecting dust.
- a user holds manual operation section 205 and starts the operation of cleaner 200, and then electric blower generates suction air for producing suction force.
- the user moves intake tool 202 on the target face, then dust together with the air can be sucked from the target face through intake tool 202.
- the dust and air sucked flow into dust collector 206 through extension tube 204 and hose 203, and dust collector 206 separates the dust from the air, and only the dust is collected in dust collector 206.
- the air separated from dust is sucked by electric blower 100 and passes through blower 100 and main body 201 before it is discharged outside main body 201.
- electric vacuum cleaner 200 in accordance with the fifth embodiment includes electric blower 100 equipped with one of impeller 1, 51, 52, or 53 demonstrated in embodiments 1 - 4, cleaner 200 achieves high suction performance and low noises.
- Use of electric vacuum cleaner 200 in accordance with the fifth embodiment allows the users to carry out a clean-up efficiently.
- the impeller of the present invention is not limited to the structure of impeller 1, 51, 52, or 53 demonstrated in the previous embodiments.
- the number of first vane sections 26, the number of second vane sections 29, the number of blades 22 are set 9 (nine) respectively in embodiments 1 - 4.
- the impeller of the present invention is not limited to this structure. Those numbers can be set appropriately for the air volume of the electric blower and the rpm of the impeller.
- the impeller of the present invention allows the inducer to be equipped with multiple vane sections with ease. So that an electric blower or an electric vacuum cleaner equipped with this impeller can improve the suction performance and lower the noises.
- the impeller allows the electric vacuum cleaner to increase the sucking power and lower the noises.
- the present invention is thus useful for household electric appliances and industrial devices using an electric blower.
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Abstract
Description
- The present invention relates to an impeller and an electric blower, an electric vacuum cleaner equipped with the same impeller.
- Blowing performance (suction performance) of an electric blower used in an electric vacuum cleaner has been tried to improve specifically with respect to the impeller of the blower. For instance, a structure formed of a front shroud, a rear shroud, multiple blades, and an inducer having multiple vane sections has been proposed (e.g. refer to Patent Literature 1).
-
Fig. 11 is a partially cut-away perspective view for illustrating a structure of the conventional impeller discussed above. As shown inFig. 11 ,impeller 321 includesrear shroud 322,front shroud 323,sheet metal blades 324, andresinous inducer 325.Rear shroud 322 is made of sheet metal.Front shroud 323 is disposed separately fromrear shroud 322 with a space therebetween and havingsuction port 323a at its center. Multiplesheet metal blades 324 are held by and betweenrear shroud 322 andfront shroud 323.Inducer 325 made of resin is disposed correspondingly tosuction port 323a. -
Resinous inducer 325 includesconical hub 325b andvane sections 325a formed onhub 325b. Vanesections 325a have a three-dimensional curve for rectifying the air flowing fromsuction port 323a tosheet metal blades 324. -
Fig. 12A is a plan view illustrating the movement of a mold during the molding ofresinous inducer 325 of theconventional impeller 321.Fig. 12B is a lateral view illustrating this movements. - As shown in
Figs. 12A and 12B ,resinous inducer 325 is formed through a resin molding process using laterally-slidingmold 331 that slides radially toward the outer circumference ofvane section 325a. The mold includes laterally-slidingmold 331, upward-slidingmold 332, and downward-slidingmold 333. Molds 331 in equal numbers to that of vanes ofvane sections 325a are prepared. Upward-slidingmold 332 in equal numbers to that of vanes ofvane sections 325a are prepared. Downward-slidingmold 333 in equal numbers to that of vanes ofvane sections 325a are prepared. - It has been believed that
vane sections 325a ofresinous inducer 325 in numbers of six andmetal sheet blades 324 in numbers of also six are ideal quantities for improving the blowing (sucking) efficiency ofimpeller 321 of the conventional electric blower. However, a numbers over the six forvane sections 325a as well as formetal sheet blades 324 can sometimes gain the better blowing efficiency depending on an air volume and an rpm. - On top of that, it is generally known that a high frequency tone, which is a kind of noises generated by the electric blower, is generated conspicuously at the frequency of a product of multiplying the number of vanes (numbers of
vane sections 325a and the number of metal sheet blades 324) ofimpeller 321 by the rpm. In the case of small number of vanes, the frequency of the high frequency tone generated by the electric blower is audible frequency band to users, so that the tone sounds harshly and sometimes makes the users unpleasant. - To reduce this high frequency tone, an increment in the numbers of vanes of
impeller 321 has been studied. This method moves the frequency of the high frequency tone away from the frequency band audible to the users, thereby reducing the harsh and unpleasant noises. - However, the method of molding resinous inducer 325 of
impeller 321 of the conventional electric blower finds it difficult to mold inducer 325 having 6 or more than 6 vanes, and in a case where an end face offront shroud 323 side of avane section 325a overlaps, viewed from the top or the side, with an end face ofmetal sheet blade 324 of theadjacent vane section 325a, the molding becomes also difficult. - Patent Literature 1: Unexamined Japanese Patent Application Publication No.
2000 - 45993 - The present invention aims to provide an impeller for an electric blower, where vanes of an inducer of this impeller can be multiplied with ease and improving the blowing efficiency as well as lowering the noise, and the present invention also aims to provide the electric blower and an electric vacuum cleaner both equipped with this impeller.
- The impeller of the present invention includes a front shroud having a first opening at its center section, a rear shroud disposed separately from the front shroud with a space therebetween, multiple blades held by and between the front and rear shrouds and extending from a center section toward an outer circumference of the rear shroud, and an inducer disposed at the center section of the rear shroud. The inducer includes an upper inducer disposed at the front shroud side and a lower inducer disposed at the rear shroud side.
- The impeller of the present invention allows the inducer to be equipped with multiple vane sections with ease and improving the blowing efficiency and lowering the noises.
-
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Fig. 1 is a sectional view partially illustrating a structure of an electric blower equipped with an impeller in accordance with a first embodiment of the present invention. -
Fig. 2 is a partially cut-away perspective view illustrating a structure of the impeller in accordance with the first embodiment of the present invention. -
Fig. 3 is an exploded perspective view illustrating a structure of the impeller in accordance with the first embodiment of the present invention. -
Fig. 4 is a sectional view illustrating a structure of the impeller in accordance with the first embodiment of the present invention. -
Fig. 5A is a plan view illustrating a structure of a mold for a lower inducer of the impeller in accordance with the first embodiment of the present invention. -
Fig. 5B is a lateral view illustrating a structure of the mold for the lower inducer of the impeller in accordance with the first embodiment of the present invention. -
Fig. 6A is a plan view illustrating a structure of a mold for an upper inducer of the impeller in accordance with the first embodiment of the present invention. -
Fig. 6B is a lateral view illustrating a structure of the mold for the upper inducer of the impeller in accordance with the first embodiment of the present invention. -
Fig. 7 is a sectional view illustrating a structure of an impeller in accordance with a second embodiment of the present invention. -
Fig. 8 is a sectional view illustrating a structure of an impeller in accordance with a third embodiment of the present invention. -
Fig. 9 is a sectional view illustrating a structure of an impeller in accordance with a fourth embodiment of the present invention. -
Fig. 10 schematically illustrates an electric vacuum cleaner in accordance with a fifth embodiment of the present invention. -
Fig. 11 is a partially cut-away perspective view illustrating a structure of a conventional impeller. -
Fig. 12A is a plan view illustrating movements of a mold used in molding a resinous inducer of a conventional impeller. -
Fig. 12B is a lateral view illustrating the movements of the mold used in molding a resinous inducer of a conventional impeller. - Exemplary embodiments of the present invention are demonstrated hereinafter with reference to the accompanying drawings.
- The following description refers to
impeller 1 in accordance with the first embodiment of the present invention and alsoelectric blower 100 equipped withimpeller 1. -
Fig. 1 is a sectional view partially illustrating a structure ofelectric blower 100 equipped withimpeller 1 in accordance with the first embodiment of the present invention.Fig. 2 is a partially cut-away perspective view illustrating a structure ofimpeller 1 in accordance with the first embodiment of the present invention.Fig. 3 is an exploded perspective view illustrating a structure ofimpeller 1 in accordance with the first embodiment of the present invention.Fig. 4 is a sectional view illustrating a structure ofimpeller 1 in accordance with the first embodiment of the present invention. - As shown in
Fig. 1 ,electric blower 100 includesimpeller 1,air guide 2,fan case 3,motor 4, andbracket 6 disposed on a counter-load side. -
Impeller 1 generates an air current (suction air).Air guide 2 is disposed confronting an outer rim ofimpeller 1 for rectifying the air current supplied fromimpeller 1.Fan case 3 accommodatesimpeller 1 andair guide 2 therein.Motor 4 drivesimpeller 1.Bracket 6 disposed at counter-load side is placed on the outer wall ofmotor 4, andfan case 3 is mounted tobracket 6 hermetically. -
Impeller 1 is supported byshaft 5 ofmotor 4.Counter-load side bracket 6 includesexhausting opening 7 for exhausting the air sucked byimpeller 1. - As shown in
Fig. 2 - Fig. 4 ,impeller 1 includesfront shroud 20,rear shroud 21,multiple blades 22, andinducer 23. -
Front shroud 20 includes a first opening, i.e.suction port 20a, at its center section.Rear shroud 21 is disposed separately fromfront shroud 20 with a space therebetween.Multiple blades 22 are held by and betweenfront shroud 20 andrear shroud 21, and extend from the center section toward the outer circumference (rim) ofrear shroud 21.Inducer 23 is disposed at the center section ofrear shroud 21, and is held by and betweenfront shroud 20 andrear shroud 21. - Each one of
blades 22 hasmultiple mating protrusions front shroud 20 andrear shroud 21.Front shroud 20 andrear shroud 21 have multiple mating slits 20b and 21a for receivingmating protrusions Mating protrusions slits 20b and 21a respectively, and they are crimped together, whereby eachblade 22 can be mounted tofront shroud 20 andrear shroud 21. -
Inducer 23 is split intoupper inducer 24 andlower inducer 27 with a plane in parallel torear shroud 21, namely, the plane vertical relative toshaft 5 ofmotor 4.Upper inducer 24 stays onfront shroud 20 side, andlower inducer 27 stays onrear shroud 21 side. This structure allows applying the force vectors uniformly to the split faces ofupper inducer 24 andlower inducer 27 wheninducer 23 is held by and betweenfront shroud 20 andrear shroud 21, wherebyinducer 23 can be more firmly sandwiched betweenshrouds -
Inducer 23 is formed this way: end face P1 onfront shroud 20 side of a vane section ofinducer 23 overlaps with end face P2 onblade 22 side of a vane section of theadjacent inducer 23, and this overlap is viewed from a top or a lateral view. In other words, this form is difficult for a conventional molding method to mold. - As shown in
Fig. 3 andFig. 4 ,upper inducer 24 includesring section 25 havingsecond opening 25a at the center and multiplefirst vane sections 26 extending fromring section 25 toward the outer circumference (rim) ofinducer 23.Lower inducer 27 includesbase section 28, multiplesecond vane sections 29, andshaft section 30.Base section 28 is mounted torear shroud 21 and forms a conical shape.Second vane sections 29 extend from the center section ofbase section 28 toward the outer rim thereof.Shaft section 30 extends from the center section ofbase section 28 towardupper inducer 24, and fits intoring section 25. - As shown in
Fig. 4 ,lower inducer 27 andrear shroud 21 havethird opening 27a andfourth opening 21b at their centers for receivingshaft 5 ofmotor 4 respectively.Shaft 5 ofmotor 4 is fit into and supported bythird opening 27a andfourth opening 21b, wherebyimpeller 1 can be driven bymotor 4. - As shown in
Fig. 3 ,projection 30a is formed onshaft section 30 oflower inducer 27 atbase section 28 side.Recess 25b is formed onring section 25 ofupper inducer 24 atlower inducer 27 side, andrecess 25b mates withprojection 30a.Upper inducer 24 is thus positioned relative to and mounted tolower inducer 27 by usingprojection 30a andrecess 25b. -
Upper inducer 24 andlower inducer 27form inducer 23. andring section 25 ofupper inducer 24 fits intoshaft section 30 oflower inducer 27, wherebyupper inducer 24 is positioned relative to and mounted tolower inducer 27. This simple structure allows holdingupper inducer 24 andlower inducer 27 together more firmly. -
First vane sections 26 ofupper inducer 24 andsecond vane sections 29 oflower inducer 27 form the vane sections ofinducer 23. - As shown in
Fig. 4 ,ring section 25 ofupper inducer 24 andshaft section 30 oflower inducer 27 are formed such that plane P3 on outer wall ofring 25 forming the same plane of plane P4 ofbase section 28 oflower inducer 27 atfront shroud 20 side whenupper inducer 24 is mounted tolower inducer 27. - In this embodiment, the number of
first vane sections 26 ofupper inducer 24, the number ofsecond vane sections 29 oflower inducer 27, and the number ofblades 22 are determined nine (9) respectively considering the air volume ofelectric blower 100 and the rpm ofimpeller 1. -
Front shroud 20,rear shroud 21 andblades 22 are made of metal, andinducer 23 is made of resin. - A method for molding the foregoing
inducer 23 is demonstrated hereinafter. -
Fig. 5A is a plan view illustrating a structure of a mold forlower inducer 27 ofimpeller 1 in accordance with the first embodiment of the present invention.Fig. 5B is a lateral view of this mold structure.Fig. 6A is a plan view illustrating a structure of a mold forupper inducer 24 ofimpeller 1 in accordance with the first embodiment of the present invention.Fig. 6B is a lateral view of this mold structure. - As shown in
Fig. 5A and Fig. 5B , the mold oflower inducer 27 has angular intervals of 40 degrees, and includes slidingmolds 31 disposed in nine directions,core 32 for moldinglower inducer 27 from the top, andcavity 33 for moldinglower inducer 27 from the bottom. -
Inducer 23 has this structure therein: end face P1 on a vane section ofinducer 23 atfront shroud 20 side overlaps with end face P2 on a vane section of theadjacent inducer 23 atblade 22 side, and this overlap is viewed from the top face or the lateral face. However, sinceinducer 23 is split intoupper inducer 24 andlower inducer 27, the mold structure discussed above allows molding thisinducer 23. - As shown in
Fig. 6A and Fig. 6B , the mold forupper inducer 24 includescore 42 for moldingupper inducer 24 from the top andcavity 43 for moldingupper inducer 24 from the bottom. - As discussed previously, it is difficult for
inducer 23 with a conventional structure and a conventional molding method to have multiple vane sections. However, the split ofinducer 23 into two parts, i.e.upper inducer 24 andlower inducer 27 as discussed in this embodiment, allows the two parts to be molded independently. During the assembly ofimpeller 1, these two parts are assembled together, so that the inducer having multiple vane sections can be obtained. Multiple vane sections can be thus achieved with ease ininducer 23, so that the blowing efficiency ofelectric blower 100 can be improved, and the lower noises also can be achieved. - Since
inducer 23 is held by and betweenfront shroud 20 andrear shroud 21,inducer 23 can be held firmly with this simple structure.Inducer 23 can have multiple vane sections with ease as discussed above. Use ofimpeller 1 in accordance with this first embodiment allowselectric blower 100 to improve the blowing efficiency and lower the noises. -
Impeller 51 in accordance with the second embodiment of the present invention is demonstrated hereinafter. -
Fig. 7 is a sectional view illustrating a structure ofimpeller 51. - Similar elements to those of
impeller 1 in accordance with the foregoing first embodiment have the same reference marks, and the descriptions thereof are omitted. - As shown in
Fig. 7 ,groove section 34 is provided on a perimeter offront shroud 20 at a position wherefirst vane section 26 is brought into contact withsecond vane section 29.Groove section 34 has a shape similar to an end face of thefirst vane section 26 and thesecond vane section 29 which are brought into contact with each other atgroove section 34 offront shroud 20, andgroove section 34 has a width almost equal to that of this end face. - This structure, i.e.
groove section 34, allowsfront shroud 20 to holdinducer 23 more firmly.Groove section 34 also allows correcting warp or deformation produced during the molding ofinducer 23 by internal stress. - Use of
impeller 51 in accordance with the second embodiment allowsinducer 23 to have multiple vane sections with ease.Electric blower 100 can thus improve the blowing efficiency and lower the noises. -
Impeller 52 in accordance with the third embodiment of the present invention is demonstrated hereinafter.Impeller 52 in accordance with the third embodiment of the present invention is demonstrated hereinafter with reference toFig. 8 which is a sectional view illustrating a structure ofimpeller 52. Similar elements to those ofimpeller 1 andimpeller 51 discussed inembodiments - As shown in
Fig. 8 ,second vane section 29 includesprojection 29a extending from an end face, contacting withfront shroud 20, towardfront shroud 20.Front shroud 20 includeshole 20c at a place corresponding toprojection 29a for receivingprojection 29a.Inducer 23 is rigidly mounted tofront shroud 20 by insertingprojection 29a ofsecond vane section 29 intohole 20c offront shroud 20 and welding them together. - This simple structure allows
front shroud 20 to holdinducer 23 more firmly, so thatinducer 23 can be equipped with multiple vane sections with ease. As a result, use ofimpeller 52 in accordance with this third embodiment allowselectric blower 100 to improve the blowing efficiency and lower the noises. - In this third embodiment, the structure of
projection 29a is formed onsecond vane section 29; however, the present invention is not limited to this structure. For instance,projection 29a can be formed onfirst vane section 26, or it can be formed on bothfirst vane section 26 andsecond vane section 29. These simple structure also allow front shroud to holdimpeller 23 more firmly, andimpeller 23 can be thus equipped with multiple vane sections with ease. As a result,electric blower 100 can improve the blowing efficiency and lower the noises. -
Impeller 53 in accordance with the fourth embodiment of the present invention is demonstrated hereinafter.Impeller 53 in accordance with the fourth embodiment of the present invention is demonstrated hereinafter with reference toFig. 9 which is a sectional view illustrating a structure around the center ofimpeller 53. - Similar elements to those of
impellers - As shown in
Fig. 9 ,tab 30b is formed around the end face ofshaft section 30 oflower inducer 27 atfront shroud 20 side, andtab 30b is received like a stopper onring section 25 ofupper inducer 24 atfront shroud 20 side. - This structure allows
upper inducer 24 to holdlower inducer 24 more firmly along the shaft direction, so thatinducer 23 can be equipped with multiple vane sections with ease. As a result, use ofimpeller 53 in accordance with the fourth embodiment allowselectric blower 100 to improve the blowing efficiency and lower the noises. -
Electric vacuum cleaner 200 in accordance with the fifth embodiment of the present invention is demonstrated hereinafter.Electric vacuum cleaner 200 in accordance with the fifth embodiment of the present invention is demonstrated hereinafter with reference toFig. 10 which schematically showsvacuum cleaner 200. Similar elements to those used in embodiments 1 - 4 have the same reference marks, and the descriptions thereof are omitted here. - As shown in
Fig. 10 , cleaner 200 includesmain body 201,intake tool 202 for sucking dust from a target surface for cleaning,hose 203 of which first end is hooked up tomain body 201,extension tube 204 of which first end is connected tohose 203 and the other end is connected tointake tool 202.Manual operation section 205 is provided to an end section onhose 203 atextension tube 204 side. -
Main body 201 includes one ofimpellers electric blower 100 for generating suction air, anddust collector 206 placed on upstream side ofblower 100 for collecting dust. - Operation and advantages of
electric vacuum cleaner 200 discussed above are demonstrated hereinafter. - A user holds
manual operation section 205 and starts the operation of cleaner 200, and then electric blower generates suction air for producing suction force. The user movesintake tool 202 on the target face, then dust together with the air can be sucked from the target face throughintake tool 202. - The dust and air sucked flow into
dust collector 206 throughextension tube 204 andhose 203, anddust collector 206 separates the dust from the air, and only the dust is collected indust collector 206. The air separated from dust is sucked byelectric blower 100 and passes throughblower 100 andmain body 201 before it is discharged outsidemain body 201. - Since
electric vacuum cleaner 200 in accordance with the fifth embodiment includeselectric blower 100 equipped with one ofimpeller electric vacuum cleaner 200 in accordance with the fifth embodiment allows the users to carry out a clean-up efficiently. - The impeller of the present invention is not limited to the structure of
impeller - For instance, the number of
first vane sections 26, the number ofsecond vane sections 29, the number ofblades 22 are set 9 (nine) respectively in embodiments 1 - 4. However, the impeller of the present invention is not limited to this structure. Those numbers can be set appropriately for the air volume of the electric blower and the rpm of the impeller. - The impeller of the present invention allows the inducer to be equipped with multiple vane sections with ease. So that an electric blower or an electric vacuum cleaner equipped with this impeller can improve the suction performance and lower the noises.
- On top of that, the impeller allows the electric vacuum cleaner to increase the sucking power and lower the noises. The present invention is thus useful for household electric appliances and industrial devices using an electric blower.
-
- 1, 51, 52, 53
- impeller
- 2
- air guide
- 3
- fan case
- 4
- motor
- 5
- shaft
- 6
- counter-load side bracket
- 7
- exhausting opening
- 20
- front shroud
- 20a
- suction port (first opening)
- 20b, 21a
- mating slit
- 20c
- hole
- 21
- rear shroud
- 21b
- fourth opening
- 22
- blade
- 22a, 22b
- mating protrusion
- 23
- inducer
- 24
- upper inducer
- 25
- ring section
- 25a
- second opening
- 25b
- recess
- 26
- first vane section
- 27
- lower inducer
- 27a
- third opening
- 28
- base section
- 29
- second vane section
- 29a
- projection
- 30
- shaft section
- 30a
- projection
- 30b
- tab
- 31
- sliding mold
- 32, 42
- core
- 33, 43
- cavity
- 34
- groove section
- 100
- electric blower
- 200
- electric vacuum cleaner
- 201
- main body
- 202
- intake tool
- 203
- hose
- 204
- extension tube
- 205
- manual operation section
- 206
- dust collector
Claims (9)
- An impeller comprising:a front shroud having a first opening at a center section of the front shroud;a rear shroud disposed separately from the front shroud with a space therebetween;a plurality of blades held by and between the front shroud and the rear shroud, and extending from a center section of the rear shroud toward an outer circumference of the rear shroud; andan inducer disposed at the center section of the rear shroud,wherein the inducer includes an upper inducer disposed at the front shroud side and a lower inducer disposed at the rear shroud side.
- The impeller of claim 1, wherein the inducer is held by and between the front shroud and the rear shroud.
- The impeller of claim 1, wherein the inducer is split into the upper inducer and the lower inducer with a plane parallel to the rear shroud.
- The impeller of claim 1, wherein the upper inducer includes:a ring section having a second opening at a center section of the ring section; anda plurality of first vane sections extending from the ring section toward an outer circumference of the inducer,
wherein the lower inducer includes:a base section mounted to the rear shroud;a plurality of second vane sections extending from a center section of the base section toward an outer circumference of the base section; anda shaft section extending from the center section of the base section toward the upper inducer and fitting into the ring section. - The impeller of claim 4, wherein the front shroud has a groove section on a whole perimeter of the front shroud at a place where the front shroud is brought into contact with the first vane sections and the second vane sections.
- The impeller of claim 4, wherein a projection is provided to at least one of the first vane sections and the second vane sections, the projection extending from the first vane sections and the second vane section toward the front shroud,
wherein a hole is provided to the front shroud for receiving the projection,
wherein the inducer is rigidly mounted to the front shroud by inserting the projection into the hole and welding the projection. - The impeller of claim 4, wherein the shaft section of the lower inducer has a tab that is to be received by the ring section of the upper inducer for fitting.
- An electric blower comprising the impeller as defined in any one of claim 1 through claim 7.
- An electric vacuum cleaner comprising:a main body including the electric blower of claim 8; andan intake tool for sucking dust from a target face for cleaning.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010147074A JP2012012937A (en) | 2010-06-29 | 2010-06-29 | Impeller, and electric blower and electric cleaner provided with impeller |
PCT/JP2011/002643 WO2012001861A1 (en) | 2010-06-29 | 2011-05-12 | Impeller, and electric blower and electric cleaner provided with impeller |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2441962A1 true EP2441962A1 (en) | 2012-04-18 |
EP2441962A4 EP2441962A4 (en) | 2013-01-02 |
EP2441962B1 EP2441962B1 (en) | 2014-11-12 |
Family
ID=45401611
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11791190.9A Not-in-force EP2441962B1 (en) | 2010-06-29 | 2011-05-12 | Impeller, and electric blower and electric cleaner provided with impeller |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2441962B1 (en) |
JP (1) | JP2012012937A (en) |
CN (1) | CN102510954A (en) |
TW (1) | TW201200091A (en) |
WO (1) | WO2012001861A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10584712B2 (en) | 2013-12-27 | 2020-03-10 | Honda Motor Co., Ltd. | Impeller |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20130110440A (en) * | 2012-03-29 | 2013-10-10 | 삼성전기주식회사 | Impeller and vacuum cleaner motor assembly having the same |
JP6091072B2 (en) * | 2012-04-02 | 2017-03-08 | 本田技研工業株式会社 | Rotating body and impeller |
JP7145588B2 (en) * | 2017-06-14 | 2022-10-03 | 日立グローバルライフソリューションズ株式会社 | Electric blower and vacuum cleaner equipped with the same |
CN107664139A (en) * | 2017-09-28 | 2018-02-06 | 镇江三联泵业机械成套设备有限公司 | The impeller of blade easy to disassemble |
CN109586492A (en) * | 2017-09-29 | 2019-04-05 | 广东朗科智能电气有限公司 | Motor of dust collector |
CN109578299A (en) * | 2017-09-29 | 2019-04-05 | 广东朗科智能电气有限公司 | Motor of dust collector and its blower fan structure and wind wheel |
CN109586426A (en) * | 2017-09-29 | 2019-04-05 | 广东朗科智能电气有限公司 | Motor of dust collector and its motor stator |
TWI696440B (en) * | 2018-01-29 | 2020-06-21 | 王勝豊 | Cleaning device |
SI25978A (en) * | 2020-03-05 | 2021-09-30 | HYLA, Proizvodnja, razvoj in trgovina d.o.o | Separator for a vacuum cleaner |
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JPH03138493A (en) * | 1989-10-20 | 1991-06-12 | Matsushita Electric Ind Co Ltd | Motor-driven blower |
US5478206A (en) * | 1991-03-23 | 1995-12-26 | Robert Bosch Gmbh | Impeller for a radial fan |
JPH09177694A (en) * | 1995-12-25 | 1997-07-11 | Matsushita Electric Ind Co Ltd | Electric blower |
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JPH0178287U (en) * | 1987-11-13 | 1989-05-25 | ||
JP3617103B2 (en) * | 1995-03-08 | 2005-02-02 | 松下電器産業株式会社 | Electric blower |
JPH0998918A (en) * | 1995-10-03 | 1997-04-15 | Hitachi Ltd | Vacuum cleaner |
JP3796974B2 (en) | 1998-07-31 | 2006-07-12 | 松下電器産業株式会社 | Electric blower |
JP4140086B2 (en) * | 1998-07-17 | 2008-08-27 | 松下電器産業株式会社 | Electric blower |
JP4428044B2 (en) * | 2003-03-24 | 2010-03-10 | 株式会社日立プラントテクノロジー | Impeller manufacturing method and impeller |
TWI278573B (en) * | 2004-10-07 | 2007-04-11 | Sunonwealth Electr Mach Ind Co | Impeller assembly |
JP2007244563A (en) * | 2006-03-15 | 2007-09-27 | Matsushita Electric Ind Co Ltd | Electric air blower and vacuum cleaner using the same |
GB0613796D0 (en) * | 2006-07-12 | 2006-08-23 | Johnson Electric Sa | Blower |
-
2010
- 2010-06-29 JP JP2010147074A patent/JP2012012937A/en active Pending
-
2011
- 2011-05-12 EP EP11791190.9A patent/EP2441962B1/en not_active Not-in-force
- 2011-05-12 WO PCT/JP2011/002643 patent/WO2012001861A1/en active Application Filing
- 2011-05-12 CN CN2011800039010A patent/CN102510954A/en active Pending
- 2011-05-13 TW TW100116830A patent/TW201200091A/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03138493A (en) * | 1989-10-20 | 1991-06-12 | Matsushita Electric Ind Co Ltd | Motor-driven blower |
US5478206A (en) * | 1991-03-23 | 1995-12-26 | Robert Bosch Gmbh | Impeller for a radial fan |
JPH09177694A (en) * | 1995-12-25 | 1997-07-11 | Matsushita Electric Ind Co Ltd | Electric blower |
Non-Patent Citations (1)
Title |
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See also references of WO2012001861A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10584712B2 (en) | 2013-12-27 | 2020-03-10 | Honda Motor Co., Ltd. | Impeller |
Also Published As
Publication number | Publication date |
---|---|
JP2012012937A (en) | 2012-01-19 |
TW201200091A (en) | 2012-01-01 |
WO2012001861A1 (en) | 2012-01-05 |
EP2441962A4 (en) | 2013-01-02 |
EP2441962B1 (en) | 2014-11-12 |
CN102510954A (en) | 2012-06-20 |
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