EP3199817A1 - Seitenkanal bläser/sauger mit verbessertem laufrad - Google Patents

Seitenkanal bläser/sauger mit verbessertem laufrad Download PDF

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Publication number
EP3199817A1
EP3199817A1 EP16153459.9A EP16153459A EP3199817A1 EP 3199817 A1 EP3199817 A1 EP 3199817A1 EP 16153459 A EP16153459 A EP 16153459A EP 3199817 A1 EP3199817 A1 EP 3199817A1
Authority
EP
European Patent Office
Prior art keywords
blades
impeller
central body
machine
blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16153459.9A
Other languages
English (en)
French (fr)
Inventor
Pietro Bianchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Esam SpA
Original Assignee
Esam SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Esam SpA filed Critical Esam SpA
Priority to EP16153459.9A priority Critical patent/EP3199817A1/de
Publication of EP3199817A1 publication Critical patent/EP3199817A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D23/00—Other rotary non-positive-displacement pumps
    • F04D23/008—Regenerative pumps
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes

Definitions

  • the present invention relates to a side-channel blower / aspirator with an improved impeller.
  • the impeller is enclosed into a casing in which an annular conduit is defined, in which the impeller blades rotate.
  • the annular conduit has a suction mouth, through which a fluid (normally air) is aspirated and a delivery mouth through which the fluid is expelled.
  • a fluid normally air
  • a delivery mouth through which the fluid is expelled.
  • the impellers used in side-channel machines are provided with rectilinear radial blades.
  • the Applicant following research and experimentation activities, has observed that the shape of known impeller blades does not allow the operating principle described above to be exploited with full efficiency.
  • the technical task underpinning the present invention is therefore to propose a side-channel blower / aspirator with an improved impeller that makes it able to offer better performance levels with respect to the known art.
  • 1 indicates the side-channel blower / aspirator according to the invention.
  • the proposed machine 1 comprises an impeller 2 improved with respect to machines of the prior art.
  • the impeller 2 is provided with a plurality of peripheral blades 21 and is equipped with a central hub 22, fitted onto a shaft 11 (see in particular figure 2 ), which is placed in rotation by motor means of the known type, for example the electric motor 12 represented in figures 1 and 2 .
  • the blades 21 of the impeller 2 are not rectilinear like those of the prior art but, on the contrary, have a particular curvature.
  • the impeller 2 according to the invention is enclosed in a casing 13, 14 which internally defines an annular conduit C within which the blades 21 rotate, in the direction indicated by the arrow in figure 3 .
  • the two parts of the channel C which are ideally separated by the plane orthogonal to the axis of rotation of the impeller 2 coinciding with the plane of symmetry of the machine 1, are called “side channels”.
  • the casing is preferably made of two half-shells 13, 14, sealingly fixed, one of which is connected to the electric motor 12, while the other one constitutes a front cover.
  • the aforementioned annular conduit C has a suction mouth 3 for aspirating fluid (in particular air) taken externally to the machine 1 and a delivery mouth 4 for allowing the fluid to exit from the machine 1 itself.
  • the annular conduit C has a first section which, with respect to the advancement direction of the blades 21 in the conduit, goes from the suction mouth to the delivery mouth.
  • the annular conduit C further has a second section, which goes from the delivery mouth to the suction mouth, within which, preferably, the blades 21 skim the internal walls of the section itself so as to limit the passage of fluid from the delivery mouth 4 to the suction mouth 3.
  • the impeller 2 is equipped with blades 21 comprising at least one transversally curved portion, defining a relative substantially curved section.
  • such blades 21 each define a concavity 23 facing the advancement direction of the blades 21 within the conduit.
  • the blades 21 of the impeller 2 according to the invention instead of being rectilinear, are laterally curved, defining curved transversal sections and a concave front surface 23, at least in the aforementioned portion (see in detail figures 5 and 6 ).
  • the section (or intersection) of the blades 21 of the impeller 2 taken along a plane perpendicular to the diametral plane and parallel to the axis of rotation of the impeller 2 defines, at the front surface 23 itself, a curved and not rectilinear line.
  • each blade 21 may be rectilinear or curved, as explained below.
  • the impeller 2 may comprise a central body 24, preferably axial symmetric, for example discoidal, at the centre of which the aforementioned hub 22 is afforded and from which the blades 21 extend.
  • the blades 21 originate from a circumferential portion 25 of the central body 24 and extend outwards, substantially lying in the plane of the central body 24 itself.
  • each blade 21 includes a proximal portion 210 (i.e. more internal) joined to the central body 24 at its circumferential portion 25.
  • the blades 21 have a transversal curvature along their entire longitudinal extension; even more preferably, such curvature affects the whole transversal extension of the individual blade 21.
  • the blades may each be provided with one rectilinear portion and at least one curved portion, the latter being for example a longitudinal distal portion comprising the free end of the relative blade or the aforementioned proximal portion or even a median portion, etc.
  • the blades may be formed by a plurality of curved sections, defining cuspidal joining zones.
  • the curved or partially curved conformation of the blades 21 allows the machine 1 to operate more efficiently with respect to the prior art, for the reasons illustrated below.
  • the air that is found inside the annular channel tends to move away from the impeller blades in the transversal direction to the blades, i.e. substantially parallel (or oblique) to the axis of rotation (see arrows E of figure 6 ).
  • the part of air thrust in the lateral direction with respect to the impeller i.e. which would tend to move sideways away from the blades 21, is instead intercepted by the blades 21 themselves and projected forwards.
  • the component of the fluid's motion field substantially perpendicular to the radial directions is in part deviated in the circumferential direction already by the actual blade 21 before the fluid is subject to the action of the closing walls of the conduit.
  • impeller blades being rectilinear or formed by straight segments, are not able to "capture” air flows moving in the transversal direction within the annular conduit.
  • the blades 21 of the impeller 2 are placed tangentially to the aforementioned circumferential portion 25 of the central body 24.
  • the mentioned proximal portion 210 of the blade 21 extends from the circumferential portion 25 outwards and along a tangential direction to the circumferential portion 25 itself.
  • proximal (or “base”) portion 210 of the blade 21 has a curvature such that it is tangential to the circumferential portion 25.
  • part of the fluid contained in the annular conduit, furthest from the centre of rotation, tends to move forwards in the rotation direction along an ascending curve; instead, part of the fluid closer to the centre of rotation follows a descending curve until it moves in the retrograde direction upon reaching the internal area affected by the base of the blades 21 (see arrow D in figure 4 ).
  • the blades 21 of the impeller 2 according to the invention being equipped at the base 210 of the aforementioned tangential bend at the joining circumference between blades 21 and central body 24, are able to intercept the aforementioned retrograde fluid and push it forwards, increasing the efficiency of the machine 1.
  • each blade 21, as well as the transversal curvature described above has a second curvature along its longitudinal extension (see for example figures 3 and 4 ).
  • each proposed impeller blade has the longitudinal curvature along its whole extension, in particular along its whole longitudinal extension.
  • the curvature is such as to define, in each blade 21, a curved profile (or longitudinal section), still with concavity facing the rotation direction.
  • the blade 21 is able to intercept and project forwards the air flows which would tend to radially escape from the blade 21 itself.
  • the invention allows improved efficiency of the machine 1 with respect to the prior art.
  • the blades 21 have a curvature such as to be tangential to a respective diametral plane which passes through the axis of the central body; in detail, the tangency point is located in the rear convex part of the blade 21.
  • each blade 21 is contained in one of the two semi-spaces defined by an ideal diametral plane that joins the axis of the central body 24 to the joining zone between the blade 21 and the central body 24.
  • the impeller 2 proposed may include a portion with an annular progression 26, which lies in a plane of symmetry of the impeller 2 perpendicular to the axis of rotation.
  • Such an annular portion 26 is incorporated into the blades 21 and extends starting from the circumferential portion 25 mentioned various times of the impeller, in a radial direction, and ends at a shorter distance than the longitudinal extension of the blades 21, for example, substantially half way along their length.
  • the impeller 2 proposed may be made of die-cast aluminium or a polymeric material by injection moulding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP16153459.9A 2016-01-29 2016-01-29 Seitenkanal bläser/sauger mit verbessertem laufrad Withdrawn EP3199817A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16153459.9A EP3199817A1 (de) 2016-01-29 2016-01-29 Seitenkanal bläser/sauger mit verbessertem laufrad

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16153459.9A EP3199817A1 (de) 2016-01-29 2016-01-29 Seitenkanal bläser/sauger mit verbessertem laufrad

Publications (1)

Publication Number Publication Date
EP3199817A1 true EP3199817A1 (de) 2017-08-02

Family

ID=55521355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16153459.9A Withdrawn EP3199817A1 (de) 2016-01-29 2016-01-29 Seitenkanal bläser/sauger mit verbessertem laufrad

Country Status (1)

Country Link
EP (1) EP3199817A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11644044B2 (en) 2017-09-07 2023-05-09 Robert Bosch Gmbh Side-channel compressor for a fuel cell system for conveying and/or compressing a gaseous media

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4325672A (en) * 1978-12-15 1982-04-20 The Utile Engineering Company Limited Regenerative turbo machine
JPH01121598A (ja) * 1987-11-06 1989-05-15 Daikin Ind Ltd 渦流形ターボ機械
DE19955955A1 (de) * 1999-11-19 2001-06-13 Siemens Ag Seitenkanalmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4325672A (en) * 1978-12-15 1982-04-20 The Utile Engineering Company Limited Regenerative turbo machine
JPH01121598A (ja) * 1987-11-06 1989-05-15 Daikin Ind Ltd 渦流形ターボ機械
DE19955955A1 (de) * 1999-11-19 2001-06-13 Siemens Ag Seitenkanalmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11644044B2 (en) 2017-09-07 2023-05-09 Robert Bosch Gmbh Side-channel compressor for a fuel cell system for conveying and/or compressing a gaseous media

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