EP3362689A1 - Élément de raccordement destiné au raccordement d'une pale au moyeu d'un ventilateur axial industriel, et système de pale comprenant cet élément de raccordement - Google Patents

Élément de raccordement destiné au raccordement d'une pale au moyeu d'un ventilateur axial industriel, et système de pale comprenant cet élément de raccordement

Info

Publication number
EP3362689A1
EP3362689A1 EP15798338.8A EP15798338A EP3362689A1 EP 3362689 A1 EP3362689 A1 EP 3362689A1 EP 15798338 A EP15798338 A EP 15798338A EP 3362689 A1 EP3362689 A1 EP 3362689A1
Authority
EP
European Patent Office
Prior art keywords
connecting element
blade
hub
present
axial fan
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Withdrawn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
EP15798338.8A
Other languages
German (de)
English (en)
Inventor
Roberto Eduardo Mosiewicz
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.)
REM Holding Srl
Original Assignee
REM Holding Srl
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 REM Holding Srl filed Critical REM Holding Srl
Publication of EP3362689A1 publication Critical patent/EP3362689A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • 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
    • 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
    • F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
    • 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
    • F04D29/64—Mounting; Assembling; Disassembling of axial pumps
    • F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
    • F04D29/646—Mounting or removal of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2230/00—Manufacture
    • F05B2230/20—Manufacture essentially without removing material
    • F05B2230/24—Manufacture essentially without removing material by extrusion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/70—Shape
    • F05B2250/71—Shape curved
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/109—Purpose of the control system to prolong engine life
    • F05B2270/1095—Purpose of the control system to prolong engine life by limiting mechanical stresses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/10—Inorganic materials, e.g. metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/40—Organic materials
    • F05B2280/4003—Synthetic polymers, e.g. plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/60—Properties or characteristics given to material by treatment or manufacturing
    • F05B2280/6003—Composites; e.g. fibre-reinforced
    • 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
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/24—Manufacture essentially without removing material by extrusion
    • 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
    • F05D2250/00—Geometry
    • F05D2250/70—Shape
    • F05D2250/71—Shape curved
    • 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
    • F05D2270/00—Control
    • F05D2270/01—Purpose of the control system
    • F05D2270/11—Purpose of the control system to prolong engine life
    • F05D2270/114—Purpose of the control system to prolong engine life by limiting mechanical stresses
    • 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
    • F05D2300/10—Metals, alloys or intermetallic compounds
    • 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
    • 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
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/603—Composites; e.g. fibre-reinforced

Definitions

  • Connecting element for connecting a blade to the hub in an industrial axial fan, and blade system comprising said connecting element
  • the present invention concerns a connecting element for connecting a blade, or airfoil profile, to the hub of an industrial axial fan, a blade system comprising said connecting element, and an industrial axial fan comprising such blade system.
  • the axial fans for industrial application typically comprise a hub and a plurality of airfoil profiles.
  • a blade basically comprises two parts, the airfoil profile having the function to move the air, and the connecting element or attachment having the function to link the airfoil profile to the hub.
  • Object of the present invention is the connecting element connecting the airfoil to the hub and the blade system comprising a blade, an hub and the connecting element according to the present invention.
  • the forces acting on the blades of an axial fan during operation can be divided in steady forces A) and unsteady forces B).
  • the centrifugal force generate a bending moment into the axial plane, having direction opposed to the direction of the moment the lift and the weight generate, as shown in the fig. 4b.
  • Oxy is a system of coordinates having the origin at the restrained section of the blade supporting element, the x-axis radially directed and the y-axis parallel to the rotational axis
  • M is the steady state resulting bending moment
  • Xca is the radial position of the center of the aerodynamic force
  • Xcg is the radial position of the center of gravity
  • Ycg is the vertical position of the center of gravity
  • a first connecting element comprises the rigid connection shown on Figures 2a and 2b: a stiff connection part or element is used, having a stiffness in the radial direction higher than that of the profile.
  • the support of the connecting element on the hub is designed so that the airfoil profile axis is inclined in the vertical plane and has a fixed angle a with respect to the ideal rotation plane. This arrangement as the centrifugal force is opposing the lift, allowing to decrease the steady loads according the above mentioned formula (1 ), but has no effect on the unsteady loads.
  • FIG. 2c Another connecting element known in the art is the hinged connection shown on Figure 2c: a hinge with horizontal axis is acting as a connection between the profile and the hub. In this case the profile is free to rotate perpendicularly to the fan rotation plane, therefore when the fan is in operation it tends to keep a position where the traction force is balanced by the centrifugal force, minimizing the steady loads.
  • a further connecting element known in the art comprises a flexible connection comprising one single element, as shown on Figure 2d, where one element connecting the profile to the hub has such a high flexibility that it can bend in the vertical plane without being overstressed, reducing both steady and unsteady loads.
  • a further connecting element comprises a flexible connection comprising two overlapping elements, as shown on Figure 2e, where two elements connecting the profile to the hub interacting each other will bend in a controlled way, in the vertical plane, without being overstressed. Steady and unsteady loads will be reduced.
  • a further connecting system known in the art comprises a connecting element as it is shown in Figure 2f.
  • the connecting element has a variable stiffness, an adequate extension and the addition of a weight close to the tip of the blade, so that the blade is forced to vibrate according the second mode therefore reducing both steady and unsteady forces.
  • the centrifugal force tends to counteract to the blade deformation. Therefore longer is the blade connecting element, larger is the center of gravity displacement, greater is the steady state resulting bending moment reduction.
  • the effect produced by the centrifugal force is linearly depending on the displacement of the center of gravity, which is more than linearly depending on the length of the blade attachment.
  • the dynamic response of a blade to the alternated loads is depending on its modal properties.
  • the fan blade can be schematized as follows: a cantilever beam (the attachment), restrained on one end and with a suspended rigid mass (the profile) on the free end. Without affecting the consideration, assuming the attachment has a constant cross section, the blade natural frequencies are inversely proportional to the square of the attachment length, according to the following equation:
  • L is the attachment length
  • m is the equivalent mass per unit length
  • the invention presents a longer length due to the camber compared to the systems known in the art, that means, for an identical fan blade, its natural frequencies are remarkably lower.
  • the blade of the axial fan as a mass-damping-stiffness system and assuming it similar to a multi-degrees-of-freedom (MDoF) system, when the system is dynamically excited with a time dependent forces f(t), the equation of motion is the following:
  • M is the blade mass matrix
  • K is the blade stiffness matrix
  • x(t) is the system response vector
  • f(t) is the forcing function vector.
  • mi is the i-th modal mass
  • Ci is the i-th modal damping
  • ki is the i-th modal stiffness
  • pi(t) is the i-th modal load
  • qi(t) is the i-th modal coordinate
  • Equation (4) can be rewritten in terms of the dynamic variables ⁇ which is the system frequency and ⁇ which is the modal damping ratio, both defined as follows:
  • the blade response in terms of geometrical coordinates can be obtained from the superposition of the displacement related to each single modal contribution.
  • the single modal contribution is strictly depending on the two main modal parameters listed above: the frequency and the modal damping. As shown in figure 10, lowering the blade frequency cause higher damping that means a reduction in the blade response and, once again, in the loads on the blade.
  • Another object of the present invention is to provide a connecting element which allows to minimize the natural frequencies of the system with respect the systems known in the art; for the first modes, the associated modal damping are higher than for the prior art solutions and for the higher modes, the associated damping is lower.
  • the present invention provide a connecting element which has a rectangular cross section and an "L" shaped longitudinal section, being the short side of "L” connected to the hub and the long side to the profile, with a typical ratio between the two sides of 0.1 .
  • g(x) is a function only of the radial position
  • h(t) is a periodic function
  • the connecting element according to the present invention allows to reduce the response of the blade system to alternated loads in general and in resonance condition in particular.
  • Figures 1 a, 1 b, 2a, 2b, 2c, 2d, 2e, 2f show different examples of blade assemblies for axial fans according to the prior art
  • FIGS 3a and 3b show the two deformed conditions of the blade system comprising the connecting element according to the present invention
  • Figures 4a and 4b show the forces acting on a blade system comprising a connecting element according to the present invention
  • Figure 5 represents a lateral view of a blade connected to an hub by means of a connecting element according to the present invention
  • Figure 6 shows a top view of a connecting element according to one embodiment of the present invention.
  • Figure 7 shows a perspective view of the connecting element of Figure 6 after the bending
  • Figure 8 shows a connecting element according to the present invention according to a second embodiment, obtained by transversal extrusion or pulltrusion;
  • Figure 9 shows a lateral view of the connecting element of Figure 8, in which can be appreciated the variable transversal section obtained by extrusion or pulltrusion and the thickening in the most critical area;
  • Figure 10 represents a diagram showing the modal damping as a function of the natural frequency of a blade assembly
  • Figures 1 1 a and 1 1 b represent different possible arrangements of the connecting element according to the present invention turned up and, respectively, turned down;
  • Figure 12 shows an example of an installation of an industrial axial fan comprising a blade assembly comprising a connecting element according to the present invention
  • Figure 13 shows a connecting element according to the present invention bolted to an hub.
  • Figure 14 shows a connecting element according to the present invention according to a third embodiment, in which the angle between the two parts of the connecting element realizes the blade precone angle;
  • Figures 15 and 16 show a connecting element according to the present invention according to a third embodiment, in which the precone angle is obtained in different but easy ways.
  • the main task of the present invention is to provide a connecting element for connecting the airfoil profile to the hub of an industrial axial fan.
  • the present invention concerns a connecting element 1 consisting of an extremely simple element, see for example Figures 5 to 7, having essentially a rectangular cross-section and a "L" shaped longitudinal-section comprising a first part 1a having a substantially straight develop and a second part 1 b having a straight develop, said first 1a and second 1 b part being connected by a linking part 1c presenting a curvature radius so that said first 1a and second 1 b parts lie on substantially perpendicular planes.
  • Said first part 1a of the L-shaped profile which is the shorter part, is apt to be connected to the hub 20 while said second part 1 b, which is the longer part, is apt to be connected to the airfoil profilelO, said link part 1 c connecting said short part 1a to said long part 1 b.
  • the blade system 100 comprising the connecting element 1 according to the present invention, is also part of the invention.
  • the blade system 100 for industrial axial fans is characterized by the fact that the blade, subject to unsteady loads, is forced to modify its modal properties: frequencies and deformation shapes, as described above.
  • the inventors have carried out functional tests to compare the blade system 100 of the present invention, comprising the connecting element 1 according to the invention, to the prior art systems.
  • the results confirm that with the connecting element 1 of the present invention the natural frequencies of the system are 20% lower than in the prior art, the damping ratios of the first three vibration modes are respectively 24%, 15% and 3% higher than the same damping ratios of a blade system according to the prior art, only the fourth mode has 4% of lower damping.
  • the relative participation factor of the first four modes are respectively 0.43, 0.24, 0.14 and 0.09; therefore the response of the blade to that system of loads is completely described by the superposition of the response of these four modes.
  • the blade system 100 of the present invention comprising the innovative connecting element 1 , has a maximum response 22% reduced with respect to the response of a blade system of the prior art. Considering that the loads on the blade are proportional to its response, the invention involves a significant reduction in loads acting on the blade. Additionally, the connecting element 1 according to the present invention has the further, very important characteristic to be non-symmetrical.
  • the effect produced by the centrifugal force C is linearly depending on the displacement of the center of gravity, which is more than linearly depending on the length of the blade attachment.
  • the blade system of the present invention comprising a connecting element which has a longer length with respect to the connecting elements of the prior art, can provide higher displacement of the blade and, consequently, higher counteracting effect than the blade known in the art.
  • the connecting element 1 As it is evident from Figures 5 to 7 the structure and the profile of the connecting element 1 according to the present invention is very simple to be manufactured. Still preserving its peculiar features, the connecting element 1 may be realized by means of several different methods, allowing to reach very low production costs when compared with those of the connecting elements currently available on the market.
  • the connecting element 1 may be obtained by a simple manufacturing process comprising a first cutting phase and a second drilling phase, starting from a sheet of aluminum, steel or other proper material according to the required shape, and a final bending phase (reference is to Figures from 5 to 7);
  • the connecting element 1 may be obtained by a manufacturing process comprising a first cutting phase and a second drilling phase, starting from a semi finished product obtained by extrusion or pulltrusion (reference is to Figures 8 and 9); It will be appreciated that such extrusion allows to easily realize different shapes, which can obtain further important advantages: for example a larger thickness may be provided when higher stresses are foreseen, i.e. in the hub-connection zone (reference is to Figure 9);
  • the connecting element 1 may be obtained by a manufacturing process comprising a first cutting phase and a second drilling phase, starting from a pulltruded or molded element made of plastic or fiberglass material;
  • the connecting element 1 may be obtained by a manufacturing process comprising a first cutting phase and a second drilling phase, starting from a simple " L" shape profile.
  • the L-shaped connecting element according to the present invention may be eventually combined with a prior art system to increase its effects.
  • the connecting element of the present invention consists in its unsymmetrical shape: thanks to the L-shaped unsymmetrical profile, the connecting element 1 can be assembled with the linking part 1 c turned either up or down (fig. 5a and 5b): the unsymmetrical shape of the connecting element allows to raise or lower the blade rotation plane according the installation needs (reference is to Figure 12).
  • connecting element can be fixed to the hub 20 with one or more bolts depending on the operation duty (reference is to Figure 13).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne un élément de raccordement destiné au raccordement d'une pale, ou d'un profilé aérodynamique, au moyeu d'un ventilateur axial industriel, un système de pale comprenant cet élément de raccordement, ainsi qu'un ventilateur axial industriel comprenant un tel système de pale. Selon l'invention, l'élément de raccordement (1) destiné au raccordement d'une pale (10) au moyeu (20) d'un ventilateur axial industriel est réalisé en une seule pièce en forme de L comprenant une première partie (1a) présentant un développement sensiblement droit et une seconde partie (1b) présentant un développement sensiblement droit, la première (1a) et la seconde (1b) partie étant reliées par une partie de liaison (1c) présentant un rayon de courbure, la première (1a) et la seconde (1b) partie reposant sur des plans sensiblement perpendiculaires. L'élément de raccordement de la présente invention permet d'obtenir plusieurs avantages par rapport à l'état de la technique, l'un de ces avantages consistant en sa forme et son procédé de fabrication extrêmement simples, ce qui rend cet élément de raccordement avantageux sur le plan économique.
EP15798338.8A 2015-10-16 2015-10-16 Élément de raccordement destiné au raccordement d'une pale au moyeu d'un ventilateur axial industriel, et système de pale comprenant cet élément de raccordement Withdrawn EP3362689A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/074027 WO2017063712A1 (fr) 2015-10-16 2015-10-16 Élément de raccordement destiné au raccordement d'une pale au moyeu d'un ventilateur axial industriel, et système de pale comprenant cet élément de raccordement

Publications (1)

Publication Number Publication Date
EP3362689A1 true EP3362689A1 (fr) 2018-08-22

Family

ID=54697535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15798338.8A Withdrawn EP3362689A1 (fr) 2015-10-16 2015-10-16 Élément de raccordement destiné au raccordement d'une pale au moyeu d'un ventilateur axial industriel, et système de pale comprenant cet élément de raccordement

Country Status (5)

Country Link
US (1) US20180291913A1 (fr)
EP (1) EP3362689A1 (fr)
CN (1) CN108138786A (fr)
RU (1) RU2697001C1 (fr)
WO (1) WO2017063712A1 (fr)

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CN108138786A (zh) 2018-06-08
RU2697001C1 (ru) 2019-08-08
US20180291913A1 (en) 2018-10-11
WO2017063712A1 (fr) 2017-04-20

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