EP0568722A1 - Roue de ventilateur à décharge axiale - Google Patents

Roue de ventilateur à décharge axiale Download PDF

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Publication number
EP0568722A1
EP0568722A1 EP92107813A EP92107813A EP0568722A1 EP 0568722 A1 EP0568722 A1 EP 0568722A1 EP 92107813 A EP92107813 A EP 92107813A EP 92107813 A EP92107813 A EP 92107813A EP 0568722 A1 EP0568722 A1 EP 0568722A1
Authority
EP
European Patent Office
Prior art keywords
fan wheel
foot
wheel according
carrier body
cutouts
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
EP92107813A
Other languages
German (de)
English (en)
Other versions
EP0568722B1 (fr
Inventor
Karl Dipl.-Ing.(Fh) Jakob
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP19920107813 priority Critical patent/EP0568722B1/fr
Priority to DE59202036T priority patent/DE59202036D1/de
Publication of EP0568722A1 publication Critical patent/EP0568722A1/fr
Application granted granted Critical
Publication of EP0568722B1 publication Critical patent/EP0568722B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/34—Blade mountings

Definitions

  • the invention relates to a fan wheel with an axial throw, consisting of a rotationally symmetrical carrier body and a plurality of radially extending blades attached to its periphery.
  • fan wheels are generally known from fans.
  • Fan wheels of the aforementioned type are usually supplied in one piece or permanently installed. This makes it necessary to produce a large number of different fan wheel types for different purposes, in particular different fan powers, which in turn requires a corresponding large number of production forms, as a result of which production and storage are expensive.
  • the performance of a fan can be influenced to a certain extent by the angle of attack of the blades and blades attached to a hub, the conventional technology again requiring a corresponding number of molds or gauges to produce such fan wheels.
  • the invention is based on the object of specifying a fan wheel, the construction of which enables simple manufacture and at the same time also makes it possible to satisfy different requests for fan performance comparatively easily.
  • the invention creates a modular structure in which the fan wheel consists of a cup-shaped body and on the circumference of which the blades are individually and detachably attached.
  • the individual wings each consist of a wing and a foot, with the help of which the wing is attached to the pot-shaped body.
  • the invention is based on the knowledge that it is much easier to produce different angles of attack of a wing blade with respect to the wing root than is possible if the wing blades are connected directly to the hub. It is namely not difficult to realize different angles of attack of a wing blade with respect to the foot carrying it with one and the same injection mold by different assembly of the mold parts.
  • the modular design which is specified by the invention, thus makes it possible to use one and the same support pot for wing blades with different angles of attack, different shapes and different sizes.
  • the construction is such that the assembly of the wings on the pot-shaped carrier body is extremely simple. For this purpose, only the wing blade feet need to be pushed into the corresponding cutouts in the carrier body and secured thereon, for example by screws.
  • a particular advantage is that the radial forces acting on the wings do not have to be absorbed by the aforementioned screw connection, but rather by the edges of the feet which engage under the corresponding edges of the cutouts in the cup-shaped support body.
  • the insertion of the wing blade feet into the cutouts is particularly easy if the cutouts taper slightly in width and the width of the feet is adjusted accordingly.
  • the feet can then be attached to the cup-shaped support body from the outside in the radial direction and inserted into the cutouts with a very short path.
  • This tapered shape of the cutout and foot also creates a certain wedge effect, which ensures a firm fit of the feet on the support body.
  • the edge connections between the cutouts and the wing blade feet are designed in the manner of tongue and groove connections, which ensures that the feet are securely attached to the pot-shaped support body and prevents mobility in the radial direction.
  • the detachable attachment of the wings to the carrier body has the further advantage that it is possible to replace wings individually if they should be damaged. Furthermore, it is possible to avoid any imbalances that could arise due to manufacturing tolerances and that can be compensated for in known fan impellers only by retrospectively balancing the weights by appropriately composing blade sets.
  • the cup-shaped carrier body can be part of an external rotor of an electric external rotor motor, it can be pressed onto or shrunk onto an external rotor, or it can also be wedged onto a motor axis and rotate together with the internal rotor, whereby it can partially accommodate laminated cores and windings of the motor.
  • an essentially cylindrical, pot-shaped body 1 hereinafter referred to as a support body
  • five cutouts 2 which are arranged evenly distributed around its circumference and from the bottom 3 of the support body 1 to just before extend opposite edge of the carrier body 1, so that there remains a continuous peripheral region 4.
  • the cutouts 2 run on the jacket of the carrier body 1 essentially in the axial direction, but they narrow slightly, starting from the bottom 3 towards the edge region 4.
  • the cutouts 2 also extend through the edge region of the base 3 of the support body 1.
  • the cutouts 2 are each delimited by two edges running in the axial direction and one edge running in the circumferential direction, these edges being set back in the example shown relative to the circumference of the jacket of the support body 1 and, as FIGS. 1 and 2 show, to form edge strips 5a and 5b.
  • the bottom 3 of the carrier body 1 has depressions 6 in each case.
  • the bottom 3 is penetrated by a central bore 7, into which a bushing 9 provided with a keyway 8 is pressed.
  • the foot 10 of a wing blade 11 is seated in each cutout 2 with the associated recess 6.
  • This foot 10 as shown in FIG. 2, has an approximately L-shaped cross section, consisting of a leg 12 supporting the wing blade 11 and a leg 13 running at right angles thereto which is intended to rest on the bottom 3 of the support body 1.
  • This leg 13 is in the assembled state in the recess 6, as shown in FIG. 2 below. It is provided with a bore 14 for receiving a screw (not shown), which is to be screwed into a threaded bore 15 in the bottom 3 of the carrier body 1.
  • the latter leg 13 has a shoulder 16 in its free end region on its side facing the bottom 3 of the carrier body 1, and the recess 6 in the bottom 3 of the carrier body 1 is provided with a matching shoulder 17 in the area under the threaded hole 15, so that in the assembled state, which is shown in Fig. 2 below, the shoulders 16 and 17 lie against each other and the shoulder 17 supports the foot 10 against centrifugal forces arising during operation.
  • the leg 12 of the foot 10 carrying the wing blade 11 is provided at its edge with grooves 18a and 18b which are intended to receive the edge strips 5a and 5b, as a result of which this leg 12 is separated from the edge strips 5a and 5b in radial direction is supported.
  • the leg 12 is relatively stiff, it can be designed as a solid body, as shown in FIG. 2, or it can also be hollowed out on the inside and provided with stiffening ribs which run in the axial and circumferential directions.
  • the wing feet 10 need only be attached at a suitable point and in the cutouts 2 to be inserted so that the edge strips 5a and 5b slide into the grooves 18a and 18b and finally the shoulder 16 slides under the shoulder 17.
  • the wing base 10 is then fixed by screwing a screw into the threaded bore 15 on the carrier body 1.
  • the carrier body 1 consists of a plastic material or aluminum injection molding, a threaded insert made of steel, which has the threaded bore 15, can be embedded in the material of the carrier body 1. Mixtures of plastic and aluminum, layer materials and other compound materials are also suitable as further materials for the carrier body 1. Similar materials can be used for the wings, including their wing feet.
  • Fig. 3 shows an illustration of the cloth-shaped carrier body 1 from its back.
  • the rear sides of the contact surfaces of approximately trapezoidal shape of the wing base legs 13 with the threaded bores 15 and a stiffening by radially extending webs 19 between these contact surfaces and the hub area can be seen therein.
  • Fig. 4 shows a partial view of a second embodiment of the invention in axial section, which differs from the embodiment according to FIGS. 1 to 3 in that a retaining screw for securing a wing on the support body not by the leg 13 resting on the floor 3 of the foot 10 is screwed into the floor 3, but the screw is to be screwed through the leg 12 of the foot 10 which carries the wing blade 11 and which has a corresponding bore 20 for this purpose.
  • the carrier body has a corresponding number of screw bores 21 on a section of the carrier body 1 lying under each cutout 2. Otherwise, shoulders 16 and 17 are also formed on support body 1 and foot 10 in this embodiment, which absorb centrifugal forces, comparable to the example according to FIG. 2.
  • FIG. 5 shows a third embodiment of the invention, in which the foot 10, which carries a wing blade 11, has only a single leg 12 which is to be pushed into the associated cutout 2 on the carrier body 1.
  • the centrifugal forces are absorbed only by the edges of foot leg 12 and cutout 2.
  • a spring tongue firmly connected to the foot 10 can also be provided as a safeguard against the foot being pushed out of its cutout.
  • This solution is shown as an alternative in Fig. 5 below. It comprises a spring tongue, which is formed on the foot 10 on its side facing away from the wing blade 11 and which protrudes from the underside of the foot 10 and can be pressed elastically into a recess 23 in the underside of the foot leg 12 when the foot 10 in the Cutout 2 is inserted into the carrier body 1.
  • the spring tongue 22 relaxes again, its free end engaging behind a collar 24 on the carrier body 1 and thus preventing the foot 10 from being released from the carrier body 1 against the direction of insertion.
  • This solution enables the wings to be fastened particularly quickly to the support body and requires no tools.
  • This embodiment of the invention can also be used in combination with an airfoil foot of L-shaped cross section according to the type of FIGS. 2 and 4, so that a securing by screws can then be dispensed with.
  • the invention also makes it possible to disassemble the fan wheel in order to replace damaged blades. It is also possible to help with different weighted blades or blade feet are used to balance the fan wheel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19920107813 1992-05-08 1992-05-08 Roue de ventilateur à décharge axiale Expired - Lifetime EP0568722B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19920107813 EP0568722B1 (fr) 1992-05-08 1992-05-08 Roue de ventilateur à décharge axiale
DE59202036T DE59202036D1 (de) 1992-05-08 1992-05-08 Lüfterrad mit axialem Wurf.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19920107813 EP0568722B1 (fr) 1992-05-08 1992-05-08 Roue de ventilateur à décharge axiale

Publications (2)

Publication Number Publication Date
EP0568722A1 true EP0568722A1 (fr) 1993-11-10
EP0568722B1 EP0568722B1 (fr) 1995-04-26

Family

ID=8209601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920107813 Expired - Lifetime EP0568722B1 (fr) 1992-05-08 1992-05-08 Roue de ventilateur à décharge axiale

Country Status (2)

Country Link
EP (1) EP0568722B1 (fr)
DE (1) DE59202036D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997012149A1 (fr) * 1995-09-29 1997-04-03 Sundstrand Corporation Dispositif pourvu de lames et procede de fabrication de celui-ci
GB2367596A (en) * 2000-10-06 2002-04-10 Nmb Fan rotor construction
CN104641119A (zh) * 2012-03-22 2015-05-20 法雷奥热系统公司 通风装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1503675A1 (de) * 1965-06-09 1970-04-23 Ziehl Abegg Kg Befestigung fuer Fluegelraeder
DE4033104A1 (de) * 1990-10-18 1992-04-23 Idea Ermert Elektromotorisch angetriebener raumventilator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1503675A1 (de) * 1965-06-09 1970-04-23 Ziehl Abegg Kg Befestigung fuer Fluegelraeder
DE4033104A1 (de) * 1990-10-18 1992-04-23 Idea Ermert Elektromotorisch angetriebener raumventilator

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 120 (M-140)(998) 3. Juli 1982 & JP-A-57 46 097 ( TOKYO SHIBAURA DENKI ) 16. März 1982 *
Section PQ, Week 8705, 4. Februar 1987 Derwent Publications Ltd., London, GB; Class Q56, AN 87-035704/05 & SU-A-1 236 187 (SELKHOZKHIMMASHBUR) 12. September 1984 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997012149A1 (fr) * 1995-09-29 1997-04-03 Sundstrand Corporation Dispositif pourvu de lames et procede de fabrication de celui-ci
GB2367596A (en) * 2000-10-06 2002-04-10 Nmb Fan rotor construction
WO2002029253A1 (fr) * 2000-10-06 2002-04-11 Minebea Co. Ltd. Sous-assemblage de ventilateur
CN104641119A (zh) * 2012-03-22 2015-05-20 法雷奥热系统公司 通风装置

Also Published As

Publication number Publication date
DE59202036D1 (de) 1995-06-01
EP0568722B1 (fr) 1995-04-26

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