EP3362689A1 - Connecting element for connecting a blade to the hub in an industrial axial fan, and blade system comprising said connecting element - Google Patents
Connecting element for connecting a blade to the hub in an industrial axial fan, and blade system comprising said connecting elementInfo
- 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- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000005452 bending Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000011265 semifinished product Substances 0.000 claims description 4
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000013016 damping Methods 0.000 description 18
- 230000004044 response Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000005484 gravity Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000036962 time dependent Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000011990 functional testing Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2015/074027 WO2017063712A1 (en) | 2015-10-16 | 2015-10-16 | Connecting element for connecting a blade to the hub in an industrial axial fan, and blade system comprising said connecting element |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3362689A1 true EP3362689A1 (en) | 2018-08-22 |
Family
ID=54697535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15798338.8A Withdrawn EP3362689A1 (en) | 2015-10-16 | 2015-10-16 | Connecting element for connecting a blade to the hub in an industrial axial fan, and blade system comprising said connecting element |
Country Status (5)
Country | Link |
---|---|
US (1) | US20180291913A1 (en) |
EP (1) | EP3362689A1 (en) |
CN (1) | CN108138786A (en) |
RU (1) | RU2697001C1 (en) |
WO (1) | WO2017063712A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106460869B (en) * | 2014-05-13 | 2019-04-09 | 雷姆控股有限公司 | Blade for industrial aerofoil fan and the industrial aerofoil fan including this blade |
DE102017106233A1 (en) | 2017-03-23 | 2018-09-27 | Ebm-Papst Mulfingen Gmbh & Co. Kg | connecting element |
TWI667415B (en) * | 2018-06-22 | 2019-08-01 | 建準電機工業股份有限公司 | Conversion plate for blades and ceiling fan including the same |
Family Cites Families (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US979949A (en) * | 1910-04-04 | 1910-12-27 | Frederick Herkert Jr | Pull-out bracket. |
IL46416A (en) * | 1974-01-22 | 1978-09-29 | Paturle Sa Ets | Construction material containing plastics and process and apparatus for its production |
JPS54135709U (en) * | 1978-03-14 | 1979-09-20 | ||
DK142624B (en) * | 1978-04-13 | 1980-12-01 | Topsoe Haldor As | Process for producing a methane-rich gas. |
GB2263943B (en) * | 1992-01-29 | 1996-05-08 | Hunter Fan Co | Ceiling fan |
US5441391A (en) * | 1994-01-05 | 1995-08-15 | Patton Electric Company, Inc. | Air propelling apparatus with fan shaft mounted on guards |
SE506358C2 (en) * | 1996-04-17 | 1997-12-08 | Flaekt Ab | Rotor blade for attaching to a hub of a rotor, such as a vane for attaching to a fan hub |
US6010308A (en) * | 1997-12-01 | 2000-01-04 | Youn; Fang-Chan | Ceiling fan blade |
CN2332837Y (en) * | 1998-03-24 | 1999-08-11 | 刘安盛 | Ceiling fan with improved structure |
CN2345753Y (en) * | 1998-06-01 | 1999-10-27 | 王裕雄 | Ceiling fan |
EP0979949A1 (en) * | 1998-08-10 | 2000-02-16 | San-Chi Wu | Fan blade assembly of a ceiling fan |
US6139276A (en) * | 1998-11-20 | 2000-10-31 | Aloha Housewares Co., Ltd. | Ceiling fan assembly and method for assembling same |
CN2437887Y (en) * | 2000-07-10 | 2001-07-04 | 安徽天大(集团)股份有限公司工程塑料厂 | Axial ventilator with hemmed blade |
US6431834B1 (en) * | 2000-08-30 | 2002-08-13 | Prime Home Impressions, Llc | Multi-connection, stable fan blade attachment mount |
BR0104385B1 (en) * | 2000-10-05 | 2009-08-11 | axial fan. | |
CN2575346Y (en) * | 2002-10-25 | 2003-09-24 | 无锡申达空调设备有限公司 | Three-position actuator |
US6758626B1 (en) * | 2003-01-09 | 2004-07-06 | Min-Chi Tseng | Connecting device of a ceiling fan for connecting a blade to a bracket |
CN2823617Y (en) * | 2005-07-22 | 2006-10-04 | 盛才良 | Large axial flow fan with zero bending monent structure blade root |
US20070154315A1 (en) * | 2006-01-05 | 2007-07-05 | Bucher John C | Ceiling fan with high efficiency ceiling fan blades |
US7955055B1 (en) * | 2006-04-14 | 2011-06-07 | Macroair Technologies, Inc. | Safety retaining system for large industrial fan |
JP2008248700A (en) * | 2007-03-29 | 2008-10-16 | Kobe Steel Ltd | Impeller and manufacturing method for impeller |
EP2025947B1 (en) * | 2007-07-31 | 2013-02-27 | R.E.M. Holding S.R.L. | Hub-profile connection system for axial fan and axial fan provided with this connection system |
AU2009228858B2 (en) * | 2008-03-24 | 2013-01-10 | Prime Datum, Inc. | Integrated fan drive system for air-cooled heat exchanger (ACHE) |
CN201650791U (en) * | 2009-11-16 | 2010-11-24 | 佛山市顺德区科霸菱电机有限公司 | AC brushless ceiling fan |
US9039377B2 (en) * | 2010-08-09 | 2015-05-26 | Lowe's Companies, Inc. | Fan assemblies and methods for assembling same |
CN102297159B (en) * | 2011-09-16 | 2013-09-18 | 威海克莱特菲尔风机股份有限公司 | Axial impeller with vanes and hubs in composite hinge |
CN102588340A (en) * | 2012-04-01 | 2012-07-18 | 上海尔华杰机电装备制造有限公司 | Fan impeller with preset taper angle |
CN107002707B (en) * | 2014-11-11 | 2019-08-13 | 可风可意大利公司 | Blade unit for Industrial fan |
-
2015
- 2015-10-16 EP EP15798338.8A patent/EP3362689A1/en not_active Withdrawn
- 2015-10-16 WO PCT/EP2015/074027 patent/WO2017063712A1/en active Application Filing
- 2015-10-16 CN CN201580083690.4A patent/CN108138786A/en active Pending
- 2015-10-16 US US15/767,568 patent/US20180291913A1/en not_active Abandoned
- 2015-10-16 RU RU2018111934A patent/RU2697001C1/en active
Also Published As
Publication number | Publication date |
---|---|
CN108138786A (en) | 2018-06-08 |
RU2697001C1 (en) | 2019-08-08 |
US20180291913A1 (en) | 2018-10-11 |
WO2017063712A1 (en) | 2017-04-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3362689A1 (en) | Connecting element for connecting a blade to the hub in an industrial axial fan, and blade system comprising said connecting element | |
Hansen | Improved modal dynamics of wind turbines to avoid stall‐induced vibrations | |
Lund | Stability and damped critical speeds of a flexible rotor in fluid-film bearings | |
EP2423436B1 (en) | Airfoil shape for compressor | |
CN102207059B (en) | Wind turbine, tower and method for fabricating the same | |
RU2470192C2 (en) | Hub-section joint system for axial blower and axial blower equipped with said system | |
Li et al. | Dynamic characteristics of lag vibration of a wind turbine blade | |
CN100394119C (en) | Motor mounting structure of air conditioner | |
Szmidt et al. | Inertially excited beam vibrations damped by Vacuum Packed Particles | |
CN109519414A (en) | Centrifugal compressor, rotor structure and its center of gravity adjusting method | |
US10502236B2 (en) | Blade for industrial axial fan and industrial axial fan comprising such blade | |
KR20100084070A (en) | Vibration analysis of rotator blade | |
Eisenberger | Dynamic stiffness vibration analysis using a high‐order beam model | |
JP6842055B2 (en) | Assembled lift vertical axis wind turbine | |
US10533572B2 (en) | Blade unit for industrial fans | |
Bollimpelli et al. | Design and analysis of column mounted jib crane | |
EP3499028B1 (en) | Tool for transporting a windturbine power train subset | |
CN104863879A (en) | Air conditioner system and axial wind wheel system of same | |
US7918605B2 (en) | Gas journal bearing systems and related methods | |
US20240117856A1 (en) | Multi-degree vibration isolation unit | |
Yardimoglu et al. | Coupled bending-bending-torsion vibration of a rotating pre-twisted beam with aerofoil cross-section and flexible root by finite element method | |
CN213367363U (en) | Lead ground wire nonlinear breeze vibration suppression device | |
CN208253904U (en) | Air conditioner skeleton, air conditioner | |
Dhurvey et al. | Aerodynamic and Structural Analysis of Ceiling Fan for Different Blade Materials | |
CN106807855A (en) | A kind of small-sized bending reinforcement equipment |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20180426 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20210525 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20211005 |