EP0023784A1 - Ventilateur centrifuge pour l'air entraîné par un moteur - Google Patents

Ventilateur centrifuge pour l'air entraîné par un moteur Download PDF

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Publication number
EP0023784A1
EP0023784A1 EP80302408A EP80302408A EP0023784A1 EP 0023784 A1 EP0023784 A1 EP 0023784A1 EP 80302408 A EP80302408 A EP 80302408A EP 80302408 A EP80302408 A EP 80302408A EP 0023784 A1 EP0023784 A1 EP 0023784A1
Authority
EP
European Patent Office
Prior art keywords
impeller
bristles
blower according
air
driven centrifugal
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
Application number
EP80302408A
Other languages
German (de)
English (en)
Other versions
EP0023784B1 (fr
Inventor
John Victor Andrew Russell
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.)
AIRSWEEP LIMITED
Original Assignee
airsweep Ltd
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 airsweep Ltd filed Critical airsweep Ltd
Priority to AT80302408T priority Critical patent/ATE7418T1/de
Publication of EP0023784A1 publication Critical patent/EP0023784A1/fr
Application granted granted Critical
Publication of EP0023784B1 publication Critical patent/EP0023784B1/fr
Expired 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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by wind motors
    • 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
    • F04D23/001—Pumps adapted for conveying materials or for handling specific elastic fluids
    • 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
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/167—Operating by means of fibrous or porous elements, e.g. with sponge rotors

Definitions

  • the invention relates to power-driven centrifugal air blowers.
  • a power-driven centrifugal air blower is defined, for the purposes of this specification, as any apparatus in which a rotary impeller is driven, in use, at a relatively high speed to draw quantities of air into the apparatus along the axis of the impeller and, when the air reaches the impeller, to discharge it radially from said axis into a passage or series of passages from which it is subsequently discharged into the atmosphere.
  • the invention seeks to increase the air throughput attainable with such an apparatus.
  • the invention is embodied in a power-driven centrifugal air blower whose rotary impeller takes the form of a generally cylindrical brush, the brush being comprised of a relatively dense mass of bristles each of which extends substantially radially from a central hub.
  • the bristles thus replace the multiple individual blades of the impeller used in a conventional power-driven centrifugal air blower. They will of course be sufficiently densely distributed around the brush to move substantial quantities of air effectively into and through the apparatus. At the same time, however, they are preferably sufficiently relatively spaced from one another, and made of suitably non-electro-static material, that essentially no filtration of the indrawn air takes place as the air passes through the impeller.
  • a power-driven centrifugal air blower embodying the invention can move substantial volumes of air into and through the apparatus.
  • the rotary brush impeller lends itself.ideally to drawing air simultaneously into each opposite axial end of the apparatus and thus the throughput is maximised for a given size of impeller. If, also, no attempt is made to filter any incoming contaminated air as it passes through the impeller, the impeller does not gradually become clogged with contaminant particles and the volume of air delivered to any subsequent filter or filters is maintained at a constant maximum.
  • Such an apparatus can be used without interruption until the filter or filters are completely clogged and need to be changed.
  • a power-driven centrifugal air blower embodying the invention is extremely quiet in use. This is clearly an advantage when the apparatus is used indoors. There are several reasons for it.
  • the rotating bristles create noticeably less wind noise than the multiple blades of the conventional impeller when rotated at high speeds. They also tend to be "self-balancing" dynamically, whereas a conventional multiple bladed impeller can soon become out of balance and can create excess noise both inherently and as a result of side loading on the bearings of the motor which.rotates the impeller. If the impeller is made readily detachable, which has obvious advantages, the tendency of the conventional impeller to become,unbalanced during rotation is all the greater; and the rotary brush impeller is correspondingly more advantageous.
  • a rotary impeller 15 is carried on the shaft 14 of the motor 11.
  • the impeller 15 is shown in greater detail in Figure 2, and consists essentially of a moulded hard nylon hub 15a from whose periphery there projects a circumferential succession of relatively densely distributed bristles 15b.
  • the bristles 15b extend generally radially from the hub 15a without crossing one another. In this particular embodiment, they are made of Chinese horsehair, which is completely non-electro-static.
  • a square bore runs through the centre of the hub 15a.
  • the end of the motor shaft 14 which carries the rotary brush impeller 15 is cooperatingly squared. Once the impeller 15 has been located on the shaft 14 it is secured thereto by suitable securing means (not shown).
  • a generally annular static filter 17 is removably housed within a ring 18 which extends around the circular lower periphery of the cowl 13.
  • a bell-mouthed shroud 19 is fastened to the ring 18.
  • the ring 18 is hinged at 21 to the cowl 13, so that - as Figure 1 shows - the ring 18, the shroud 19, and the cowl 13 are all coaxial with one another when the ring 18 is brought into place against the lower periphery of the cowl 13.
  • composition of the static filter 17 can vary, and need not be described in detail. Suitable fibrous and/or cellular filtering elements are already known, and will be selected according to the intended use of the apparatus-. It will however be appreciated that the hinged construction illustrated in Figure 1 allows the filter 17 to be readily changed as well as allowing ready access to the impeller 15 and motor 11.
  • the motor 11 rotates the impeller 15 at high speed.
  • the cowl 13 surrounds the motor 11 but the surrounding walls of the cowl are radially spaced from the motor to define an air passage axially around the motor and into the impeller 15. Air is thus drawn by the impeller 15 over the motor 11 in addition to being drawn into the opposite end of the apparatus through the bell-mouthed shroud 19.
  • the centrifugal action of the rotating bristles of the impeller 15 causes the air to be discharged radially into the interior of the cowl 13, and.the interior surfaces of the cowl are so shaped that the air discharged from the impeller 15 is delivered to the anular static filter 17.
  • the build-up of air pressure within the cowl 13 drives the air through the static filter 17 for final discharge into the atmosphere surrounding the apparatus.
  • the air flow cycle is indicated in Figure 1 by suitably directioned arrows.
  • Power-driven centrifugal air filters such. as the one described above, are intended for use in fibrous atmospheres, for example in atmospheres contaminated by asbestos particles or other fibrous dusts.
  • the occupational hazards created by asbestos and other dusts in working environments are well established.
  • An asbestos-contaminated atmosphere will typically contain asbestos fibres between five microns and ten microns in length and having a maximum diameter of two microns.
  • the apparatus described and illustrated will decontaminate such an atmosphere without any particles being retained in the rotary brush impeller.
  • the throughput from the impeller to the static filter thus remains at a maximum, and the filter characteristics are used to maximum advantage before the filter needs changing.
  • the apparatus illustrated when powered by a 90 watt electric motor rotating at steady speeds above 2,500 r.p.m., can achieve a constant air throughput of approximately 7 cubic metres per minute.
  • the particular rotary brush impeller of this apparatus comprises a cylindrical nylon hub approximately one and seven eigths inches diameter and one and one quarter inches long, with bristles of Chinese horsehair each projecting for a length of two inches radially from the hub surface.
  • the bristles are grouped into relatively densely packed tufts each containing many individual bristles.
  • the axial length of the hub accommodates three spaced tufts in axial alignment with one another.
  • Figure 3 shows the way in which circumferentially successive lines of three tufts are axially staggered with respect to one another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Electrostatic Separation (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Brushes (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP80302408A 1979-08-03 1980-07-17 Ventilateur centrifuge pour l'air entraîné par un moteur Expired EP0023784B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80302408T ATE7418T1 (de) 1979-08-03 1980-07-17 Motorgetriebenes zentrifugalgeblaese fuer luft.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7927068 1979-08-03
GB7927068A GB2055968B (en) 1979-08-03 1979-08-03 Power-driven centrifugal air blower

Publications (2)

Publication Number Publication Date
EP0023784A1 true EP0023784A1 (fr) 1981-02-11
EP0023784B1 EP0023784B1 (fr) 1984-05-09

Family

ID=10506968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80302408A Expired EP0023784B1 (fr) 1979-08-03 1980-07-17 Ventilateur centrifuge pour l'air entraîné par un moteur

Country Status (9)

Country Link
EP (1) EP0023784B1 (fr)
JP (1) JPS5623593A (fr)
KR (1) KR830003659A (fr)
AT (1) ATE7418T1 (fr)
AU (1) AU6070680A (fr)
CA (1) CA1163968A (fr)
DE (1) DE3067747D1 (fr)
DK (1) DK333180A (fr)
GB (1) GB2055968B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176287A1 (fr) * 1984-09-12 1986-04-02 Imperial Chemical Industries Plc Dispositif de déplacement des gaz
WO1991004418A1 (fr) * 1989-09-20 1991-04-04 Jacob Van De Laar Appareil destine a deplacer les fluides
GB2374119A (en) * 2001-03-30 2002-10-09 Sunonwealth Electr Mach Ind Co Blower-type fan with dual inlets and a rotor for inducing axial and centrifugal flow
EP3014382A4 (fr) * 2013-06-28 2017-03-08 Intel Corporation Techniques destinées à un appareil de ventilation à résistance volumétrique améliorée, système et procédé

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509376A (en) * 1945-12-13 1950-05-30 Trask Allen Compressor
US2856117A (en) * 1956-05-09 1958-10-14 Schlumbohm Peter Centrifugal blowers
US3692421A (en) * 1970-02-24 1972-09-19 Michael Dworski Cyclonic turbine engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509376A (en) * 1945-12-13 1950-05-30 Trask Allen Compressor
US2856117A (en) * 1956-05-09 1958-10-14 Schlumbohm Peter Centrifugal blowers
US3692421A (en) * 1970-02-24 1972-09-19 Michael Dworski Cyclonic turbine engines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176287A1 (fr) * 1984-09-12 1986-04-02 Imperial Chemical Industries Plc Dispositif de déplacement des gaz
US4902196A (en) * 1984-09-12 1990-02-20 Imperial Chemical Industries Plc Gas-moving device
WO1991004418A1 (fr) * 1989-09-20 1991-04-04 Jacob Van De Laar Appareil destine a deplacer les fluides
GB2374119A (en) * 2001-03-30 2002-10-09 Sunonwealth Electr Mach Ind Co Blower-type fan with dual inlets and a rotor for inducing axial and centrifugal flow
EP3014382A4 (fr) * 2013-06-28 2017-03-08 Intel Corporation Techniques destinées à un appareil de ventilation à résistance volumétrique améliorée, système et procédé

Also Published As

Publication number Publication date
GB2055968A (en) 1981-03-11
GB2055968B (en) 1983-11-16
CA1163968A (fr) 1984-03-20
KR830003659A (ko) 1983-06-21
AU6070680A (en) 1981-02-05
EP0023784B1 (fr) 1984-05-09
DE3067747D1 (en) 1984-06-14
ATE7418T1 (de) 1984-05-15
JPS5623593A (en) 1981-03-05
DK333180A (da) 1981-02-04

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