US3181777A - Transverse-flow blower - Google Patents

Transverse-flow blower Download PDF

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Publication number
US3181777A
US3181777A US240310A US24031062A US3181777A US 3181777 A US3181777 A US 3181777A US 240310 A US240310 A US 240310A US 24031062 A US24031062 A US 24031062A US 3181777 A US3181777 A US 3181777A
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United States
Prior art keywords
rotor
flow
pressure chamber
air
slot
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Expired - Lifetime
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US240310A
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English (en)
Inventor
Coester Robert
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Individual
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Individual
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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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/02—Shock-damping bearings
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/02—Shock-damping bearings
    • G04B31/04—Shock-damping bearings with jewel hole and cap jewel

Definitions

  • This invention relates to a transverse-flow blower in which an approximately radial, inwardly directed supplementary airstream is supplied to the rotor where it enters the low pressure chamber.
  • the invention is based on the realization that the transition taking place in the rotor from the outward flow in the zone of the high pressure chamber to the inward flow which prevails in the zone of the low pressure chamber, must be effected gradually, rather than abruptly, but at any rate in such a manner that the inward flow is established at the right time and in sufiicient quantity.
  • T heseproposals have been made after the recognition that the operation and the behaviour of transverse-flow blowers are influenced by the position and concentration of these vortices.
  • the vortex flow in the rotor is more or less substantially retarded in the zone of high flow velocity by guiding devices provided outside of the rotor, in order to reduce the friction losses occurring at high flow velocities and the supplementary stream supplied to the low pressure chamber in immediate proximity to the entry of the rotor, serves to start the rotor flow.
  • This type of construction results in high pressures and good efficiencies.
  • noises are produced which are inadmissible for certain cases of application.
  • the disadvantages mentioned above are avoided by introducing at least a portion of the supplementary stream into the low pressure chamber at a zone situated upstream with respect to the point of entry of the rotor flow and by producing a continuous vortex distribution in the 3,181,777 Patented May 4, 1965 rotor.
  • a first air passageway or return duct is provided between the high pressure chamber and the low pressure chamber of the transverse-flow blower, in order to produce the supplementary stream.
  • the return duct starts in a diffusor adjacent to the high pressure chamber and spaced a certain distance apart therefrom opens into the low pressure chamber upstream of the point of entry of the rotor. Thereby it is suitable to situate the inlet opening of the return duct in that zone of the diffusor which is poor in energy.
  • the portion of the housing means or casing remaining between the return duct and the rotor is formed as a multiply curved guide surface on its side facing the rotor.
  • the slot formed between this guide surface and the rotor periphery has a well-rounded inlet from the high pressure chamber, narrows hereafter to a minimum and subsequently widens again gradually,
  • the slot may be characterized as convergent-divergent in the,
  • FIGURE 1 illustrates diagrammatically a partly sectional view of a transverse-flow blower according to the invention.
  • FIGURE 2 is a diagram showing various 'vortex distributions 7/ just at the inner edge portion of the blade screen.
  • FIGURE 3 shows the ratio Cm/Cu along said inner edge portion, symmetrical vortex and velocity distributions only being taken into consideration
  • FIG. 4 shows velocity triangles. Referring to FIGURE 1 of the drawing the blower,
  • the interior space thereof is divided into two chambers 2 and 3 by the rotor 1.
  • the latter is made in wellknown manner of discs 4 (in the drawing only one such disc is shown) between which blades 5 arearranged and transversely fastened on the periphery of the disc at a predetermined angle of incidence.
  • the air passes, as indicated by the arrow L, out of the chamber 2, i.e. out of the low pressure or inlet chamber through the rotor into the chamber 3, i.e. into the high pressure or outlet chamber, and is carried away from there by a diffuser 6, as this is indicated by another arrow L.
  • the housing means of the blower designated as a whole by the numeral 8 is provided with a further duct or first air passageway 9 one end of which extends into the diffusor 6 in the zone of the inwardly curved wall 6' of the latter for a supply of air under pressure.
  • the other end of the duct 9 communicates with the suction chamber 2, whereby the opening 9 of the duct 9 in the lowpressure chamber 2 is arranged upstream with respect to the point of entry 10 of the rotor 1 into the low pressure chamber 2.
  • the direction of the section of duct 9 adjacent to the opening 9' is selected so that the supplementary stream issuing from the duct 9 flows about tangentially to the housing walls 11 and 12 limiting the inlet flow towards the point of entry 10 of the rotor 1 into the low pressure chamber.
  • This supplementary stream originates, as it is evident, in the high pressure chamber 3, particularly in the relatively energy-poor zone along the inner wall of the diffusor. 'Attention is called again here to the fact that thereby at the same time an improvement in the pressure conversion in the diffusor is obtained.
  • the convergent-divergent slot 13 defined or delimited on the one hand by the rotor periphery and on the other hand by the guide surface 14 formed by the housing means 8, which surface extends from the inlet at point 16 to the end at tongue 1% beyond a point 15 at which the slot width reaches a minimum, serves to produce a continuous vortex distribution in the rotor as shall be explained in more detail hereafter.
  • the wall of the guide surface 11 is strongly rounded and extends generally away from the rotor periphery as shown.
  • the recess between point 15 and point 10 is connected to the side 8' of the duct 9 by means of a second air passageway or bypass 17.
  • the said passageway or bypass communicates at its discharge end with the divergent portion of the slot 13.
  • this bypass 17 is omitted.
  • the supplementary air stream which, as mentioned, is taken from the relatively energy-poor zone along the inner wall of the diffusor and which passes through duct 9 into the low pressure chamber, flows along the wall 12 at the point 10 of entry of the rotor 1 into the low pressure chamber, whereby the supplementary stream can mix with the remaining incoming air prior to arriving at the rotor. Thereby abrupt velocity changes along the rotor periphery are avoided.
  • FIGURE 3 shows various calculated velocity distributions on the inner edge portion of the blade screen resulting from the associated vortex distributions max according to FIGURE 2 just at this inner edge portion.
  • the peripheral component of flow Cu is constant.
  • the velocity triangles shown in FIGURE 4 have to be considered:
  • the flow medium In order to obtain an admission from the outside upon the forwardly curved blades 1, as free as possible from shocks, the flow medium must be supplied at low meridian velocity Cm to the rotor at low velocity and with a velocity component in the direction of the peripheral velocity. In this zone the flow medium must have an increased total pressure relatively to the low pressure chamber, so that the total pressure in the interior of the rotor remains constant throughout.
  • the direction of admission must change in such a manner that the velocity component slowly disappears in the direction of the direction of the peripheral velocity and finally the medium will be supplied with opposed vortex.
  • the zone over which vortices are distributed along the inner edge portion of the screen may be further extended by connecting a longer well rounded inlet ahead of the slot whereby a shape of slot is produced according to FIGURE 1.
  • This slot is characterised by a well rounded inlet until a certain minimum distance from the rotor, which may be relatively small, e.g. also smaller than /3 of the blade depth in radial direction. This rounded admission affords for a continuous vortex and velocity distribution between the points 16 and 10 even for working conditions of the blower far deviating from the point of optimum output.
  • the described blower in contradistinction to herefore known constructions operates with a low noise level in a wide zone of its characteristic.
  • the losses occuring in this section of the rotor are covered by the energy of the medium supplied shortly before termination of the feeding operation.
  • a small channel 17 is provided, through which additional medium from a farther downstream portion of the dilfusor may be supplied to the rotor.
  • the essential portion of the energy still required for covering losses and for stabilizing the entire field of flow, however, is taken from the supplementary stream issuing from duct 9, which at least partly opens upstream into the low pressure chamber tangentially to the incoming stream.
  • the mouth of the fiow at an upstreamlocation thus not in immediate proximity to the rotor, is pro vided, in order that eventual velocity differences between supplementary airstream and drawn-in medium may be compensated or flattened out by intermixing, and that abrupt changes in velocity on the periphery of the rotor edge, which produce noise, may no longer occur.
  • housing means also defines a relatively deep recess communicating with the divergent portion of said slot and which is bounded by an arcuate housing means surface which curves inwardly from said divergent slot portion to approximately a radial line.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
US240310A 1961-11-29 1962-11-27 Transverse-flow blower Expired - Lifetime US3181777A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1394061A CH375288A (fr) 1961-11-29 1961-11-29 Palier amortisseur de chocs pour mobile d'horlogerie

Publications (1)

Publication Number Publication Date
US3181777A true US3181777A (en) 1965-05-04

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ID=4396641

Family Applications (1)

Application Number Title Priority Date Filing Date
US240310A Expired - Lifetime US3181777A (en) 1961-11-29 1962-11-27 Transverse-flow blower

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US (1) US3181777A (zh)
CH (2) CH1394061A4 (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325089A (en) * 1965-02-02 1967-06-13 Firth Cleveland Ltd Flow machines
US3398882A (en) * 1965-03-30 1968-08-27 Zenkner Kurt Crossflow blower
US3940215A (en) * 1972-12-28 1976-02-24 Matsushita Electric Industrial Co., Ltd. Blower
US4002109A (en) * 1972-12-28 1977-01-11 Matsushita Electric Industrial Co., Ltd. Blower
US4084918A (en) * 1974-08-06 1978-04-18 Turbomachines, Inc. Wind motor rotor having substantially constant pressure and relative velocity for airflow therethrough

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3470934B1 (fr) * 2017-10-10 2020-08-19 ETA SA Manufacture Horlogère Suisse Système antichoc à blocage angulaire

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR935340A (fr) * 1946-10-28 1948-06-16 Augmenteur de flux pour réacteurs et compresseurs
GB830362A (en) * 1956-05-08 1960-03-16 Machinenfabrik Benninger A G Improvements in transverse flow blowers
GB876611A (en) * 1956-12-07 1961-09-06 Firth Cleveland Ltd Improvements in or relating to machines for inducing flow of fluid for example pumpsand blowers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR935340A (fr) * 1946-10-28 1948-06-16 Augmenteur de flux pour réacteurs et compresseurs
GB830362A (en) * 1956-05-08 1960-03-16 Machinenfabrik Benninger A G Improvements in transverse flow blowers
GB876611A (en) * 1956-12-07 1961-09-06 Firth Cleveland Ltd Improvements in or relating to machines for inducing flow of fluid for example pumpsand blowers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325089A (en) * 1965-02-02 1967-06-13 Firth Cleveland Ltd Flow machines
US3398882A (en) * 1965-03-30 1968-08-27 Zenkner Kurt Crossflow blower
US3940215A (en) * 1972-12-28 1976-02-24 Matsushita Electric Industrial Co., Ltd. Blower
US4002109A (en) * 1972-12-28 1977-01-11 Matsushita Electric Industrial Co., Ltd. Blower
US4084918A (en) * 1974-08-06 1978-04-18 Turbomachines, Inc. Wind motor rotor having substantially constant pressure and relative velocity for airflow therethrough

Also Published As

Publication number Publication date
CH1394061A4 (zh) 1963-09-30
CH375288A (fr) 1963-09-30

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