EP1251281A1 - Tangential ventilating device - Google Patents
Tangential ventilating device Download PDFInfo
- Publication number
- EP1251281A1 EP1251281A1 EP01125157A EP01125157A EP1251281A1 EP 1251281 A1 EP1251281 A1 EP 1251281A1 EP 01125157 A EP01125157 A EP 01125157A EP 01125157 A EP01125157 A EP 01125157A EP 1251281 A1 EP1251281 A1 EP 1251281A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bushing
- fan
- base member
- support
- appendixes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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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
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/057—Bearings hydrostatic; hydrodynamic
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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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
- F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
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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
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
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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
- F04D29/283—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 rotors of the squirrel-cage type
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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
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/626—Mounting or removal of fans
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/665—Sound attenuation by means of resonance chambers or interference
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/50—Building or constructing in particular ways
- F05D2230/53—Building or constructing in particular ways by integrally manufacturing a component, e.g. by milling from a billet or one piece construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/40—Organic materials
- F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/006—Arrangements for circulation of cooling air
Definitions
- the present invention relates to an improved tangential ventilating device, particularly suitable for household ovens, refrigerators, air-conditioning appliances, and electric household appliances in general.
- known ventilators of this type comprise a motor, normally a shaded-pole motor; and a tangential fan inside a screw.
- the motor substantially comprises a pack of laminations; and a rotor, the shaft of which rotates on bushings supported by two supports made of nonmagnetic material (normally die-cut or die-cast aluminium). At least one bushing is spherical for self-alignment and is held in position by a metal spring which comes in various forms and can be fitted to the support in various ways.
- the tangential fan (i.e. which operates with flow substantially tangent to its outside diameter and is normally longer than its diameter) is normally defined by a number of longitudinal blades retained or at any rate inserted inside respective seats formed in a number of transverse disks; and both the blades and disks are made of die-cut metal (typically aluminium). Fans of this sort obviously have the drawback of involving the manufacture and assembly of a large number of component parts.
- the screw also comprises a number of die-cut metal components riveted or welded to one another, and which invariably pose problems of axial alignment, squareness and parallelism; high reject rate; sharp surface edges; poor appearance; compulsory painting of the parts; and frequent servicing of die-cutting and assembly equipment.
- the device according to the invention therefore comprises a fan which, unlike the known state of the art, does not involve the manufacture and assembly of a large number of separate component parts, and therefore provides for considerable saving in terms of production cost and time.
- the fan can also be produced by axially connecting two or more modular ventilating units, so that, besides simplifying pressing of the individual units without complicating assembly (which, in fact, is extremely straightforward and fast), the blades of the various units may be offset to cut the resonance frequency of the rotating fan and so achieve optimum airflow and air pressure and reduce the noise level.
- the screw is also formed in one piece molded from appropriate plastic material, so that it is cheap, of desired appearance (color, finish, no flash) and dimensions, and within specified tolerances in terms of axial alignment and parallelism.
- the fan and motor supports are also made of plastic (and therefore nonmagnetic) material, and, unlike known self-aligning supports, require no springs.
- the spring in fact, is replaced by elastic appendixes defining the seat of the spherical bushing, so that the support is still fully functional, including being self-aligning, but at the same time provides for significant saving in terms of the number of component parts and assembly time.
- the present invention also relates to a support for a rotary member, in particular a drive pin or shaft of a tangential ventilating device fan, as claimed in the accompanying Claim 17.
- number 1 indicates as a whole a tangential ventilating device, e.g. for a known household oven (not shown).
- Device 1 comprises a tangential fan 2 housed in rotary manner inside a screw 3; a conveyor 4; and a motor 5 connected mechanically to fan 2.
- fan 2 comprises a single ventilating unit 6 defined by a one-piece body of molded plastic material (e.g. polyamide) and having two opposite longitudinal end portions 7, 8 substantially perpendicular to the axis of rotation R of the fan, and a number of longitudinal blades 10 spaced circumferentially and which are substantially parallel to one another and to axis of rotation R and extend longitudinally between end portions 7 and 8.
- molded plastic material e.g. polyamide
- End portions 7, 8 are so formed as to comprise respective solid portions and hollow portions, the solid portions of end portion 7 being superimposable over the hollow portions of the opposite end portion 8. More specifically, end portion 7 is substantially disk-shaped, and comprises a central disk 11 coaxial with axis of rotation R; three radial sectors 14, spaced 120° apart, extend radially outwards from a radially outer peripheral edge 13 of central disk 11; and end portion 8 comprises a ring 15, from a radially inner peripheral edge 16 of which project radially inwards three radial sectors 17 spaced 120° apart and offset circumferentially with respect to sectors 14.
- Blades 10 at one end project radially from a peripheral edge 18 of end portion 7 (defined, in the example shown, by a circumference through the outer edges of sectors 14), and, at the opposite end, are butt connected and substantially inscribed in a face 19 of ring 15.
- Some of blades 10 are attached, and preferably connected by reinforcing portions 20, to the outer edges of sectors 14, while the other blades 10 project axially from ring 15 and are not supported by sectors 14.
- End portion 7 also comprises a reinforcing ring 21 radially outwards of blades 10; and at least one further reinforcing ring 22, surrounding blades 10, may be interposed between end portions 7 and 8, e.g. about the middle of fan 2, as shown in Figure 1.
- central disk 11 is provided integrally with a hollow axial shaft 23; and end portion 8 comprises a seat 24 defined by the radially inner edges of sectors 17 and housing a drive member 25, e.g. a known disk of elastomeric material (shown schematically in Figure 1).
- FIGS 5 to 8 show a second embodiment 2a of a fan in accordance with the invention, and which comprises two modular ventilating units 6a, 6b having axial connecting means 26 for axial assembly end to end.
- Unit 6a is defined by a one-piece body of molded plastic material (e.g. polyamide) and has two opposite longitudinal end portions 7a, 8a substantially perpendicular to the axis of rotation R of fan 2a, and a number of longitudinal blades 10a spaced circumferentially and which are substantially parallel to one another and to axis of rotation R and extend longitudinally between end portions 7a and 8a.
- molded plastic material e.g. polyamide
- End portion 7a is substantially disk-shaped, and comprises a central disk 31 coaxial with axis of rotation R; end portion 8a is defined by a ring 32 radially outwards with respect to disk 31; blades 10a, at one end, project radially from a radially outer peripheral edge 33 of disk 31, and, at the opposite end, are butt connected and substantially inscribed in a face 34 of ring 32; and, besides being connected to peripheral edge 33 of disk 31, blades 10a have respective reinforcing portions 35 connected to a face 36 of disk 31 facing end portion 8a.
- unit 6b is defined by a one-piece body of molded plastic material (e.g. polyamide) and has two opposite longitudinal end portions 7b, 8b substantially perpendicular to the axis of rotation R of fan 2a, and a number of longitudinal blades 10b spaced circumferentially and which are substantially parallel to one another and to axis of rotation R and extend longitudinally between end portions 7b and 8b.
- End portion 7b is substantially disk-shaped, and comprises a disk 41 coaxial with axis of rotation R; and end portion 8b is defined by a ring 42 radially outwards with respect to disk 41.
- end portions 7a, 8a and 7b, 8b of each unit 6a, 6b therefore have respective solid portions and hollow portions, the solid portions of one end portion being superimposable over the hollow portions of the opposite end portion.
- Blades 10b at one end project radially from a radially outer peripheral edge 43 of disk 41, and, at the opposite end, are butt connected and substantially inscribed in a face 44 of ring 42. Blades 10b also have respective reinforcing portions 45 connected to a face 46 of disk 41 facing end portion 8b.
- disk 31 is provided integrally with a hollow shaft 50; and disk 41 has a central through seat 51 for housing a known drive member, e.g. a disk of elastomeric material as described previously.
- a known drive member e.g. a disk of elastomeric material as described previously.
- Axial connecting means 26 comprises a number of (e.g. four) connecting pins 52 carried by ring 32 of unit 6a and insertable frontwards and interferentially - or bayonet-fashion, as in the non-limiting example shown - inside respective through seats 53 in ring 42 of unit 6b.
- each pin 52 is substantially L-shaped and comprises a root portion 54 projecting axially from a face 55, opposite face 34, of ring 32; and a head 56 substantially perpendicular to root portion 54 and for engaging ring 42.
- Each seat 53 comprises a circumferential slide portion 57 having a narrow or tight portion 58 for click-on connection to a respective pin 52; and blades 10b adjacent to seats 53 have respective recesses 59 to permit insertion of heads 56.
- Two aligning notches 60 are formed on respective outer edges of rings 32, 42 to position units 6a, 6b correctly at assembly.
- Ring 32 has a locating collar 61, which projects axially from a radially inner peripheral edge 62 of ring 32 and is insertable inside ring 42.
- units 6a, 6b are so connected that respective blades 10a, 10b, as opposed to being aligned axially, are offset circumferentially to cut the resonance frequency of rotating fan 2a and so achieve optimum airflow and air pressure and reduce the operating noise level. More specifically, blades 10a, 10b of units 6a, 6b are offset half a space (i.e. each blade 10a of unit 6a is located halfway between two blades 10b of unit 6b).
- screw 3 is molded in one piece from plastic material, e.g. polyamide, and comprises two parallel, longitudinally opposite sides 70, 71 connected by a curved air-conveying wall 72, and by a front longitudinal member 73 facing curved wall 72 and defining an air outlet 74.
- Sides 70, 71 also have respective lateral flanges 75 in which holes 76 are formed for attachment to a supporting surface.
- Conveyor 4 (not shown in Figure 9 for the sake of clarity; see Figures 1 and 2) is fixed to longitudinal member 73 : advantageously, conveyor 4 is molded in one piece with screw 3, so that device 1 constitutes an integrated unit ready for assembly to the user appliance.
- Sides 70, 71 have respective self-aligning supports 100, 101 (shown in Figure 9 and Figure 10 respectively) for supporting fan 2 or 2a and motor 5 in rotary manner.
- Each support 100, 101 comprises a base member 102 having a seat 103 for a known spherical bushing 104.
- Base member 102 comprises a circular collar 105 projecting axially from a surface 106 of base member 102; and three elastic appendixes 107, which project from base member 102, are spaced circumferentially (e.g. 120° apart) about collar 105, define seat 103, and are block-shaped to cooperate elastically with bushing 104 and so support and retain bushing 104 inside seat 103.
- the respective free ends of appendixes 107 have respective contact portions 108 shaped to cooperate with a curved outer lateral surface 109 of bushing 104, to prevent any axial or rotary movement of bushing 104, and to only allow a substantially transverse alignment movement of bushing 104, which clicks axially inside seat 103 by virtue of the elasticity of appendixes 107.
- Appendixes 107 and collar 105 are formed integrally in one piece with base member 102, e.g. molded from the same plastic material as screw 3.
- support 100 is formed integrally in one piece with side 70 of screw 3, so that respective base member 102 is defined by a portion of screw 3 itself. It is to be understood, however, that support 100 may be a separate component fitted to screw 3, e.g. inserted inside a seat formed in side 70, as shown by the dash line in Figure 9.
- Support 101 comprises a substantially known disk-shaped body 110 connected to side 71 by bayonet fasteners 111 inserted inside respective seats 112 formed about a central hole 113 in side 71; in which case, base member 102 is defined by a portion of disk-shaped body 110, which is molded in one piece with base member 102, collar 105 and appendixes 107.
- supports 100, 101 as described and illustrated herein may be used in applications other than those referred to.
Abstract
Description
- The present invention relates to an improved tangential ventilating device, particularly suitable for household ovens, refrigerators, air-conditioning appliances, and electric household appliances in general.
- As is known, in the ventilation of ovens and refrigeration and air-conditioning systems in general, the trend is increasingly towards tangential power ventilators, the characteristics of which (e.g. low noise level, good pressure/airflow ratio, and compactness) represent an excellent cost/performance trade-off.
- Generally speaking, known ventilators of this type comprise a motor, normally a shaded-pole motor; and a tangential fan inside a screw.
- The motor substantially comprises a pack of laminations; and a rotor, the shaft of which rotates on bushings supported by two supports made of nonmagnetic material (normally die-cut or die-cast aluminium). At least one bushing is spherical for self-alignment and is held in position by a metal spring which comes in various forms and can be fitted to the support in various ways.
- The tangential fan (i.e. which operates with flow substantially tangent to its outside diameter and is normally longer than its diameter) is normally defined by a number of longitudinal blades retained or at any rate inserted inside respective seats formed in a number of transverse disks; and both the blades and disks are made of die-cut metal (typically aluminium). Fans of this sort obviously have the drawback of involving the manufacture and assembly of a large number of component parts.
- The screw also comprises a number of die-cut metal components riveted or welded to one another, and which invariably pose problems of axial alignment, squareness and parallelism; high reject rate; sharp surface edges; poor appearance; compulsory painting of the parts; and frequent servicing of die-cutting and assembly equipment.
- It is therefore an object of the present invention to eliminate the aforementioned drawbacks of the known state of the art by providing, in particular, a tangential ventilating device which is practical, provides for a high degree of performance and long-term reliability, and is also cheap and easy to produce.
- According to the present invention, there is provided a tangential ventilating device as claimed in the accompanying
Claim 1. - The device according to the invention therefore comprises a fan which, unlike the known state of the art, does not involve the manufacture and assembly of a large number of separate component parts, and therefore provides for considerable saving in terms of production cost and time. The fan can also be produced by axially connecting two or more modular ventilating units, so that, besides simplifying pressing of the individual units without complicating assembly (which, in fact, is extremely straightforward and fast), the blades of the various units may be offset to cut the resonance frequency of the rotating fan and so achieve optimum airflow and air pressure and reduce the noise level.
- The screw is also formed in one piece molded from appropriate plastic material, so that it is cheap, of desired appearance (color, finish, no flash) and dimensions, and within specified tolerances in terms of axial alignment and parallelism.
- According to a further aspect of the invention, the fan and motor supports are also made of plastic (and therefore nonmagnetic) material, and, unlike known self-aligning supports, require no springs. The spring, in fact, is replaced by elastic appendixes defining the seat of the spherical bushing, so that the support is still fully functional, including being self-aligning, but at the same time provides for significant saving in terms of the number of component parts and assembly time.
- Since such supports may obviously be used in applications other than those referred to herein, the present invention also relates to a support for a rotary member, in particular a drive pin or shaft of a tangential ventilating device fan, as claimed in the accompanying
Claim 17. - A number of non-limiting embodiments of the invention will be described by way of example with reference to the accompanying drawings, in which:
- Figure 1 shows a plan view of a tangential ventilating device in accordance with the invention;
- Figure 2 shows a partially-sectioned side view of the Figure 1 device;
- Figure 3 shows a view in perspective of a first embodiment of a fan applicable to the Figure 1 device;
- Figures 4a, 4b show front and rear views respectively of the Figure 3 fan;
- Figure 5 shows an exploded view in perspective of a second embodiment of a fan applicable to the Figure 1 device;
- Figures 6a, 6b show side and front views respectively of a first component part of the Figure 5 fan;
- Figures 7a, 7b show side and front views respectively of a second component part of the Figure 5 fan;
- Figure 8 shows a larger-scale detail of the Figure 5 fan;
- Figure 9 shows a view in perspective of a screw forming part of the Figure 1 device;
- Figure 10 shows a view in perspective of a rotary member support applicable to the Figure 1 device.
-
- With reference to Figures 1 and 2,
number 1 indicates as a whole a tangential ventilating device, e.g. for a known household oven (not shown).Device 1 comprises atangential fan 2 housed in rotary manner inside ascrew 3; a conveyor 4; and a motor 5 connected mechanically tofan 2. - A first embodiment of
fan 2 is shown in Figures 3 and 4, in whichfan 2 comprises a singleventilating unit 6 defined by a one-piece body of molded plastic material (e.g. polyamide) and having two oppositelongitudinal end portions longitudinal blades 10 spaced circumferentially and which are substantially parallel to one another and to axis of rotation R and extend longitudinally betweenend portions -
End portions end portion 7 being superimposable over the hollow portions of theopposite end portion 8. More specifically,end portion 7 is substantially disk-shaped, and comprises acentral disk 11 coaxial with axis of rotation R; threeradial sectors 14, spaced 120° apart, extend radially outwards from a radially outerperipheral edge 13 ofcentral disk 11; andend portion 8 comprises aring 15, from a radially innerperipheral edge 16 of which project radially inwards threeradial sectors 17 spaced 120° apart and offset circumferentially with respect tosectors 14. -
Blades 10, at one end, project radially from aperipheral edge 18 of end portion 7 (defined, in the example shown, by a circumference through the outer edges of sectors 14), and, at the opposite end, are butt connected and substantially inscribed in aface 19 ofring 15. Some ofblades 10 are attached, and preferably connected by reinforcingportions 20, to the outer edges ofsectors 14, while theother blades 10 project axially fromring 15 and are not supported bysectors 14.End portion 7 also comprises a reinforcingring 21 radially outwards ofblades 10; and at least one further reinforcingring 22, surroundingblades 10, may be interposed betweenend portions fan 2, as shown in Figure 1. - To support
fan 2 in rotary manner,central disk 11 is provided integrally with a hollowaxial shaft 23; andend portion 8 comprises aseat 24 defined by the radially inner edges ofsectors 17 and housing adrive member 25, e.g. a known disk of elastomeric material (shown schematically in Figure 1). - Figures 5 to 8 show a
second embodiment 2a of a fan in accordance with the invention, and which comprises twomodular ventilating units -
Unit 6a is defined by a one-piece body of molded plastic material (e.g. polyamide) and has two oppositelongitudinal end portions fan 2a, and a number oflongitudinal blades 10a spaced circumferentially and which are substantially parallel to one another and to axis of rotation R and extend longitudinally betweenend portions -
End portion 7a is substantially disk-shaped, and comprises acentral disk 31 coaxial with axis of rotation R;end portion 8a is defined by aring 32 radially outwards with respect todisk 31;blades 10a, at one end, project radially from a radially outerperipheral edge 33 ofdisk 31, and, at the opposite end, are butt connected and substantially inscribed in aface 34 ofring 32; and, besides being connected toperipheral edge 33 ofdisk 31,blades 10a have respective reinforcingportions 35 connected to aface 36 ofdisk 31 facingend portion 8a. - Similarly,
unit 6b is defined by a one-piece body of molded plastic material (e.g. polyamide) and has two oppositelongitudinal end portions fan 2a, and a number oflongitudinal blades 10b spaced circumferentially and which are substantially parallel to one another and to axis of rotation R and extend longitudinally betweenend portions End portion 7b is substantially disk-shaped, and comprises adisk 41 coaxial with axis of rotation R; andend portion 8b is defined by aring 42 radially outwards with respect todisk 41. In this embodiment, too,end portions unit -
Blades 10b at one end, project radially from a radially outerperipheral edge 43 ofdisk 41, and, at the opposite end, are butt connected and substantially inscribed in aface 44 ofring 42.Blades 10b also have respective reinforcingportions 45 connected to aface 46 ofdisk 41 facingend portion 8b. - To support
fan 2a in rotary manner,disk 31 is provided integrally with ahollow shaft 50; anddisk 41 has a central throughseat 51 for housing a known drive member, e.g. a disk of elastomeric material as described previously. - Axial connecting means 26 comprises a number of (e.g. four) connecting
pins 52 carried byring 32 ofunit 6a and insertable frontwards and interferentially - or bayonet-fashion, as in the non-limiting example shown - inside respective throughseats 53 inring 42 ofunit 6b. - As shown in detail in Figure 8, each
pin 52 is substantially L-shaped and comprises aroot portion 54 projecting axially from aface 55,opposite face 34, ofring 32; and ahead 56 substantially perpendicular toroot portion 54 and forengaging ring 42. Eachseat 53 comprises acircumferential slide portion 57 having a narrow ortight portion 58 for click-on connection to arespective pin 52; andblades 10b adjacent toseats 53 haverespective recesses 59 to permit insertion ofheads 56. - Two aligning
notches 60 are formed on respective outer edges ofrings position units - Ring 32 has a locating
collar 61, which projects axially from a radially inner peripheral edge 62 ofring 32 and is insertable insidering 42. - Advantageously,
units respective blades fan 2a and so achieve optimum airflow and air pressure and reduce the operating noise level. More specifically,blades units blade 10a ofunit 6a is located halfway between twoblades 10b ofunit 6b). - With reference to Figure 9,
screw 3 is molded in one piece from plastic material, e.g. polyamide, and comprises two parallel, longitudinallyopposite sides wall 72, and by a frontlongitudinal member 73 facingcurved wall 72 and defining anair outlet 74.Sides lateral flanges 75 in whichholes 76 are formed for attachment to a supporting surface. - Conveyor 4 (not shown in Figure 9 for the sake of clarity; see Figures 1 and 2) is fixed to longitudinal member 73 : advantageously, conveyor 4 is molded in one piece with
screw 3, so thatdevice 1 constitutes an integrated unit ready for assembly to the user appliance. -
Sides fan - Each
support base member 102 having aseat 103 for a knownspherical bushing 104.Base member 102 comprises acircular collar 105 projecting axially from asurface 106 ofbase member 102; and threeelastic appendixes 107, which project frombase member 102, are spaced circumferentially (e.g. 120° apart) aboutcollar 105, defineseat 103, and are block-shaped to cooperate elastically with bushing 104 and so support and retain bushing 104 insideseat 103. - More specifically, the respective free ends of
appendixes 107 haverespective contact portions 108 shaped to cooperate with a curved outerlateral surface 109 ofbushing 104, to prevent any axial or rotary movement of bushing 104, and to only allow a substantially transverse alignment movement of bushing 104, which clicks axially insideseat 103 by virtue of the elasticity ofappendixes 107. -
Appendixes 107 andcollar 105 are formed integrally in one piece withbase member 102, e.g. molded from the same plastic material asscrew 3. - In the non-limiting example shown in Figure 9,
support 100 is formed integrally in one piece withside 70 ofscrew 3, so thatrespective base member 102 is defined by a portion ofscrew 3 itself. It is to be understood, however, thatsupport 100 may be a separate component fitted toscrew 3, e.g. inserted inside a seat formed inside 70, as shown by the dash line in Figure 9. -
Support 101, on the other hand, comprises a substantially known disk-shaped body 110 connected toside 71 bybayonet fasteners 111 inserted insiderespective seats 112 formed about acentral hole 113 inside 71; in which case,base member 102 is defined by a portion of disk-shaped body 110, which is molded in one piece withbase member 102,collar 105 andappendixes 107. - It is to be understood that supports 100, 101 as described and illustrated herein may be used in applications other than those referred to.
Claims (20)
- A tangential ventilating device (1) comprising a fan (2; 2a) of the type having longitudinal blades substantially parallel to an axis of rotation (R) of the fan; the device being characterized in that said fan (2; 2a) comprises one (6) or more (6a, 6b) ventilating units; each unit being defined by a one-piece body molded from plastic material and having two opposite longitudinal end portions (7, 8; 7a, 8a, 7b, 8b) substantially perpendicular to said axis of rotation (R), and a number of longitudinal blades (10; 10a, 10b) spaced circumferentially apart, substantially parallel to one another and to said axis of rotation, and extending longitudinally between said end portions.
- A device as claimed in Claim 1, characterized in that said end portions (7, 8; 7a, 8a, 7b, 8b) of each unit (6; 6a, 6b) are so formed as to comprise respective solid portions and hollow portions; the solid portions of one end portion being superimposable over the hollow portions of the opposite end portion.
- A device as claimed in Claim 2, characterized in that said blades (10; 10a 10b) of each unit (6; 6a, 6b) project radially, at one end, from a peripheral edge (18; 33, 43) of a first end portion (7; 7a, 7b) of the unit, and, at the opposite end, are butt connected and substantially inscribed in a ring (15; 32, 42) of a second end portion (8; 8a, 8b) of the unit.
- A device as claimed in Claim 3, characterized in that the fan (2a) comprises two or more modular ventilating units (6a, 6b) having axial connecting means (26) for axial assembly end to end.
- A device as claimed in Claim 4, characterized in that said units (6a, 6b) are so connected that the respective numbers of blades (10a, 10b) are offset.
- A device as claimed in Claim 4 or 5, characterized in that said axial connecting means (26) comprise a number of connecting pins (52) carried by a first unit (6a) and insertable frontwards and interferentially or bayonet-fashion inside respective seats (53) on a second unit (6b).
- A device as claimed in one of Claims 3 to 6, characterized in that said units (6a, 6b) have respective first end portions (7a, 7b) comprising respective disks (31, 41), and respective second end portions (8a, 8b) defined by respective rings (32, 42) radially outwards with respect to the respective disks; the blades (10a, 10b) of said units extending from respective radially outer peripheral edges (33, 43) of said disks (31, 41), and being substantially inscribed in respective faces (34, 44) of said rings (32, 42).
- A device as claimed in Claim 3, characterized in that said fan (2) is defined by a single ventilating unit (6) molded entirely in one piece from plastic material; the opposite end portions (7, 8) of said unit (6) comprising respective numbers of first and second radial sectors (14, 17); and said first sectors (14) being offset circumferentially with respect to said second sectors (17).
- A device as claimed in Claim 8, characterized in that said first sectors (14) extend radially outwards from a central disk (11) of said first end portion (7); and said second sectors (17) extend radially inwards from a radially inner peripheral edge (16) of the ring (15) of said second end portion (8).
- A device as claimed in Claim 9, characterized in that said first end portion (7) comprises at least one reinforcing ring (21) radially outwards of said blades (10).
- A device as claimed in any one of the foregoing Claims, and comprising a screw (3) housing said fan (2; 2a) in rotary manner and having two parallel, longitudinally opposite sides (70, 71) connected by a curved air-conveying wall (72) and by a front longitudinal member (73) facing the curved wall and defining an air outlet (74); the device being characterized in that said screw (3) is molded in one piece from plastic material.
- A device as claimed in the foregoing Claim, characterized by comprising at least one self-aligning support (100, 101) carried by a side (70, 71) of said screw (3) and for supporting said fan (2; 2a) in rotary manner; said support (100, 101) comprising a base member (102) having a seat (103) for a spherical bushing (104); and said seat (103) being defined by a number of elastic appendixes (107), which project from said base member (102), are spaced apart circumferentially, and are block-shaped to cooperate elastically with said bushing (104) and so support and retain said bushing (104) inside said seat (103).
- A device as claimed in the foregoing Claim, characterized in that the respective free ends of said appendixes (107) have respective contact portions (108) shaped to cooperate with a curved outer lateral surface (109) of the bushing (104), to prevent any axial or rotary movement of the bushing, and to only allow a substantially transverse alignment movement of the bushing.
- A device as claimed in the foregoing Claim, characterized in that said appendixes (107) are formed integrally in one piece with said base member (102), and are preferably molded from plastic material.
- A device as claimed in the foregoing Claim, characterized in that said base member (102) comprises a circular collar (105) projecting axially from the base member (102); and three appendixes (107) spaced 120° apart about said collar (105).
- A device as claimed in one of Claims 12 to 15, characterized in that said base member (102) is formed integrally in one piece with a side (70) of said screw (3).
- A self-aligning support (100, 101) for a rotary member, in particular for a drive pin or shaft of a fan of a tangential ventilating device; the support comprising a base member (102) having a seat (103) for a spherical bushing (104); and the support being characterized in that said seat (103) is defined by a number of elastic appendixes (107), which project from a surface (106) of said base member (102), are spaced circumferentially apart, and are block-shaped to cooperate elastically with said bushing (104) and so support and retain said bushing (104) inside said seat (103).
- A support as claimed in the foregoing Claim, characterized in that the respective free ends of said appendixes (107) have respective contact portions (108) shaped to cooperate with a curved outer lateral surface (109) of the bushing (104), to prevent any axial or rotary movement of the bushing, and to only allow a substantially transverse alignment movement of the bushing.
- A support as claimed in the foregoing Claim, characterized in that said appendixes (107) are formed integrally in one piece with said base member (102), and are preferably molded from plastic material.
- A support as claimed in the foregoing Claim, characterized in that said base member (102) comprises a circular collar (105) projecting axially from said surface (106); and three appendixes (107) spaced 120° apart about said collar (105).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI010219U | 2001-04-17 | ||
IT2001MI000219U ITMI20010219U1 (en) | 2001-04-17 | 2001-04-17 | INNOVATIVE TANGENTIAL MOTOR FAN |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1251281A1 true EP1251281A1 (en) | 2002-10-23 |
EP1251281B1 EP1251281B1 (en) | 2005-03-23 |
EP1251281B2 EP1251281B2 (en) | 2009-11-04 |
Family
ID=11446742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01125157A Expired - Lifetime EP1251281B2 (en) | 2001-04-17 | 2001-10-23 | Tangential ventilating device |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1251281B2 (en) |
AT (1) | ATE291697T1 (en) |
DE (1) | DE60109577T3 (en) |
ES (1) | ES2237520T3 (en) |
IT (1) | ITMI20010219U1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1865263A2 (en) * | 2006-05-31 | 2007-12-12 | Imper S.p.A. | Integrated fan assembly for cooling an oven |
FR3001004A1 (en) * | 2013-01-15 | 2014-07-18 | Alain Martin | Tangential turbine performance improving device, has plates provided with openings for sucking air to increase output of tangential turbine, where number of openings is selected according to length of tangential turbine |
WO2015146371A1 (en) * | 2014-03-25 | 2015-10-01 | 京セラドキュメントソリューションズ株式会社 | Cross-flow fan, electronic device, and impeller |
EP3051137A4 (en) * | 2014-10-30 | 2017-01-18 | Kyocera Document Solutions Inc. | Cross flow fan, electric product provided with cross flow fan, and impeller used in cross flow fan |
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US2652190A (en) * | 1950-01-23 | 1953-09-15 | Master Appliance Mfg Co | Impeller wheel |
US3279209A (en) * | 1964-04-15 | 1966-10-18 | Laing Vortex Inc | Cross flow machines and air conditioner units incorporating such machines |
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US5114657A (en) * | 1989-03-20 | 1992-05-19 | Sanko Plastics Co., Ltd. | Integrally molded cross-flow fan and method of making the same by radially withdrawing gap-forming molds |
FR2778702A3 (en) * | 1998-05-14 | 1999-11-19 | Plaset Spa | Tangential fan with carrying and air conducting construction in which impeller or fan wheel is rotatably located driven by electric motor |
EP0964161A2 (en) * | 1998-06-12 | 1999-12-15 | Bitron S.p.A. | Fan rotor |
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DE1957988C3 (en) † | 1969-11-18 | 1974-05-02 | Wilhelm 8090 Wasserburg Gronbach | Radial fan wheel for blower |
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JP3107711B2 (en) † | 1994-08-09 | 2000-11-13 | 株式会社東芝 | Cross flow fan |
KR100311998B1 (en) † | 1998-11-06 | 2002-02-28 | 곽정환 | Crossflow Fans for Air Conditioners |
-
2001
- 2001-04-17 IT IT2001MI000219U patent/ITMI20010219U1/en unknown
- 2001-10-23 ES ES01125157T patent/ES2237520T3/en not_active Expired - Lifetime
- 2001-10-23 EP EP01125157A patent/EP1251281B2/en not_active Expired - Lifetime
- 2001-10-23 DE DE60109577T patent/DE60109577T3/en not_active Expired - Lifetime
- 2001-10-23 AT AT01125157T patent/ATE291697T1/en not_active IP Right Cessation
Patent Citations (9)
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US2652190A (en) * | 1950-01-23 | 1953-09-15 | Master Appliance Mfg Co | Impeller wheel |
DE1428162A1 (en) * | 1962-09-06 | 1969-03-20 | Nikolaus Laing | Storage for a cross-flow runner |
US3306526A (en) * | 1963-11-26 | 1967-02-28 | Laing Vortex Inc | Fans |
US3279209A (en) * | 1964-04-15 | 1966-10-18 | Laing Vortex Inc | Cross flow machines and air conditioner units incorporating such machines |
GB1421795A (en) * | 1972-07-06 | 1976-01-21 | Girolamo S Di | Fanwheel for a transverse-flow fan and fan fitted with such wheel |
US4427339A (en) * | 1980-12-31 | 1984-01-24 | Suddeutsche Kuhlerfabrik Julius Fr. Behr Gmbh & Co. Kg | Radial fanwheels |
US5114657A (en) * | 1989-03-20 | 1992-05-19 | Sanko Plastics Co., Ltd. | Integrally molded cross-flow fan and method of making the same by radially withdrawing gap-forming molds |
FR2778702A3 (en) * | 1998-05-14 | 1999-11-19 | Plaset Spa | Tangential fan with carrying and air conducting construction in which impeller or fan wheel is rotatably located driven by electric motor |
EP0964161A2 (en) * | 1998-06-12 | 1999-12-15 | Bitron S.p.A. | Fan rotor |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1865263A2 (en) * | 2006-05-31 | 2007-12-12 | Imper S.p.A. | Integrated fan assembly for cooling an oven |
EP1865263A3 (en) * | 2006-05-31 | 2010-01-06 | Imper S.p.A. | Integrated fan assembly for cooling an oven |
FR3001004A1 (en) * | 2013-01-15 | 2014-07-18 | Alain Martin | Tangential turbine performance improving device, has plates provided with openings for sucking air to increase output of tangential turbine, where number of openings is selected according to length of tangential turbine |
WO2015146371A1 (en) * | 2014-03-25 | 2015-10-01 | 京セラドキュメントソリューションズ株式会社 | Cross-flow fan, electronic device, and impeller |
JPWO2015146371A1 (en) * | 2014-03-25 | 2017-04-13 | 京セラドキュメントソリューションズ株式会社 | Cross flow fan, electronic equipment, impeller |
EP3051137A4 (en) * | 2014-10-30 | 2017-01-18 | Kyocera Document Solutions Inc. | Cross flow fan, electric product provided with cross flow fan, and impeller used in cross flow fan |
Also Published As
Publication number | Publication date |
---|---|
EP1251281B2 (en) | 2009-11-04 |
ITMI20010219V0 (en) | 2001-04-17 |
ES2237520T3 (en) | 2005-08-01 |
DE60109577T3 (en) | 2010-05-20 |
DE60109577D1 (en) | 2005-04-28 |
ITMI20010219U1 (en) | 2002-10-17 |
EP1251281B1 (en) | 2005-03-23 |
DE60109577T2 (en) | 2006-02-09 |
ATE291697T1 (en) | 2005-04-15 |
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