CN108138786A - For the connecting element of wheel hub being connected to blade in industrial axial flow blower and the blade system for including the connecting element - Google Patents
For the connecting element of wheel hub being connected to blade in industrial axial flow blower and the blade system for including the connecting element Download PDFInfo
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- CN108138786A CN108138786A CN201580083690.4A CN201580083690A CN108138786A CN 108138786 A CN108138786 A CN 108138786A CN 201580083690 A CN201580083690 A CN 201580083690A CN 108138786 A CN108138786 A CN 108138786A
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- wheel hub
- axial flow
- flow blower
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Classifications
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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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention relates to for blade or aerofoil profile to be connected to the connecting element of the wheel hub of industrial axial flow blower, it is related to the blade system for including the connecting element and the industrial axial flow blower including this blade system.According to the present invention, the connecting element for blade (10) to be connected to the wheel hub (20) of industrial axial flow blower is implemented with single-piece L-shaped part, including first part (1a) and second part (1b), the first part has substantially straight extension, the second part has substantially straight extension, the first part (1a) and the second part (1b) are connected by coupling part (1c), radius of curvature is presented in the coupling part, the first part (1a) and second part (1b) are in substantially perpendicular plane.Relative to the prior art, connecting element according to the present invention allows for several advantages, one of them described advantage is simply made of very much its shape and manufacturing method, this causes what the connecting element was economically advantageous.
Description
Invention field
The present invention relates to for blade or aerofoil profile to be connected to the connecting element on the wheel hub of industrial axial flow blower, relate to
And the blade system including the connecting element and the industrial axial flow blower including this blade system.
Wheel hub and multiple aerofoil profiles are generally included for the axial flow blower of commercial Application.
Blade consists essentially of two parts：There is the aerofoil profile of mobile air and have the aerofoil profile wheel
Exterior feature is connected to the connecting element or attachment of the function of wheel hub.
The purpose of the present invention is aerofoil profile to be connected to the connecting element of wheel hub and including blade, wheel hub and according to this
The blade system of the connecting element of invention.
Another object of the present invention is a kind of industrial axial flow blower including this blade system.
The prior art
In axial flow blower field, it is known to which many different technical solutions are used to aerofoil profile being connected to the wheel of wind turbine
Hub.
For the Brief Discussion prior art, it is important that the blade during its operation to acting on industrial axial flow blower
On static force and dynamic force again assumed that, especially with regard to the influence of centrifugal force.
Then, we connect description by aerofoil profile in the art known to reality, and the object is to reduce
The various technical solutions of stabilization and final unstable load on to the element of the wheel hub of axial flow blower.
The power acted on during operation on axial-flow fan blade may be logically divided into stable power A) and unstable power B).
A) as shown in attached drawing 4a, stable power is as follows：
Air force or lifting force (L)；
Drag (D)；
Centrifugal force (C)；
Leaf weight (W).
Relative to ideal Plane of rotation towards air sucking side inclination angle alpha, if centrifugal force generates axis of runner blade
Into the moment of flexure of the axial plane, the direction of torque that direction is generated with lifting force and weight is on the contrary, as shown in Figure 4 b.
Therefore, according to the following formula, synthesis (resulting) stable state (steady state) moment of flexure for being transmitted to wheel hub will be subtracted
It is small：
M=Lxca+W·xcg—C·ycg (1)
Wherein：
Oxy be origin at the restricted part of blade support element, x-axis is is radially directed towards and y-axis is parallel to rotation
The coordinate system of shaft axis；
M is stable state integrated reasoner；
XcaIt is the radial position at aerodynamic center；
XcgIt is the radial position of center of gravity；
YcgIt is the upright position of center of gravity.
B) unstable power is those power by following generations：
The aerodynamic field that is generated around blade and support the structure of wind turbine or comprising the phase between the housing of wind turbine
Interaction；They are proportional to the air force stablized；
Operation under the critical condition of such as blade resonance or mesomerism；Their amplitude is according to the passive of blade
Change with the damping characteristic of active；
With the interference of the environment or miscellaneous equipment of similar wind；
The vortex wake flow generated by blade profile so that they are self-induced.
Their amplitude circulating repetition, therefore they are generally referred to as alternate power.
These power cause fatigue phenomenon, and therefore, when compared with stable power, they more endanger for leaf longevity
Danger.In addition, the reason of they are the vibrations for the structure for supporting wind turbine.
In fact, it acts on to reduce the various solutions of above-mentioned power on blade attachment, for improving final products
Design reduces load and its cost.
The purpose of the present invention is also to provide the attachment of innovation for the blade of industrial axial flow blower, is suitable for reducing and stablize
With the influence of unstable load, and its cost is reduced.
To reduce operation during by act on the power on blade generation stabilization and/or unstable load and in industry
Used connecting element table in attached drawing 2a, 2b, 2c, 2d and 2e known to reality and in the market in axial flow blower field
Show, and will be briefly described herein.
First connecting element includes the rigid connection shown in Fig. 2 a and 2b：Use rigid connecting components or element, radial direction
The rigidity in direction is higher than the rigidity of the profile.
Support of the connecting element on wheel hub is designed to make the aerofoil profile axis to be tilted in vertical plane,
And there is fixed angle α relative to ideal Plane of rotation.The arrangement is due to centrifugal force with lifting force on the contrary, according to above-mentioned public affairs
Formula (1) allows to reduce stable load, but on unstable load without influence.
Another kind connecting element known in the art is articulated connection as shown in Figure 2 c：Hinge with horizontal axis is used
Make the connecting element between profile and wheel hub.In this case, which rotates freely in the wind turbine Plane of rotation,
Therefore, when fan operation, position of the tractive force by centrifugation dynamic balance is tended to remain in, makes the load minimizing of stabilization.
Alternative attachment well known in the prior art includes flexible connecting member, and the flexible connecting member includes a single-piece
Element, as shown in Figure 2 d, wherein, the element that profile is connect with wheel hub has high flexibility so that it can vertically put down
Bending is without over-stressed in face, so as to which stable and unstable load is all reduced.
In addition, another connecting element includes flexible connecting member, the flexible connecting member includes two overlap joint elements, such as schemes
Shown in 2e, wherein, two elements of the interaction between each other that profile is connect with wheel hub are bent in a controlled manner, in vertical plane
It is interior, it will not be over-stressed.Stablize and unstable load will be reduced.
Another kind connection system well known in the prior art includes connecting element, as shown in figure 2f.The connecting element tool
Have variable rigidity, enough extensions and close to the blade tip additional weight so that vane stress and according to
Second mode is vibrated, so as to which the power stablized and unstable power are all reduced.
It must be stressed that during operation, steady state force (steady state force) tends to make the deformable blade be
Similar to the shape of the first mode of cantilever beam.
Meanwhile centrifugal force tends to cancel out deformable blade.Therefore, blade connecting element is longer, and displacement of center of gravity is bigger, and stable state is comprehensive
Resultant bending moment reduces more.
The influence that centrifugal force generates linear change according to the displacement of center of gravity, it is then more than according to the length of blade attachment
It is linearly to change.
Blade depends on its characteristics of mode to the dynamic response of alternate load.
Fan blade can be expressed as followsin：Cantilever beam (attachment) is restricted and has suspension in free end at one end
Stiff Block (profile).In the case where not influencing consideration, it is assumed that the attachment has constant cross section, according to following side
Journey, the intrinsic frequency of the blade and the attachment length square are inversely proportional：
Wherein：
ωiFor i-th of intrinsic frequency
L is the length of attachment
E is Young's modulus
J is bending the moment of inertia
M is the equivalent mass of unit length
Consideration the identical of attachment is radially extended, compared with system well known in the prior art, the present invention due to
It is arc-shaped and with longer length, which means that for identical fan blade, intrinsic frequency significantly reduces.
The blade of axial flow blower is considered as Tuned mass damper stiffness system, and assumes that it is similar to multiple degrees of freedom (MDoF) system
System, when power f (t) dynamic exciting of the system with time correlation, the equation of motion is as follows：
Wherein：
M is leaf quality matrix；
C is damped coefficient matrix；
K is blade stiffness matrix；
X (t) is system response vector；
F (t) is Forcing function vector.
It can be by well known modal analysis method, according to modal coordinate, by the system of coupled-differential equations (3) from several
System of what coordinate system transformation for N number of decoupling differential equation group：
Wherein：
miFor i-th of modal mass
ciFor i-th of modal damping
kiFor i-th of modal stiffness
pi(t) it is i-th of mode load
qi(t) it is i-th of modal coordinate
I=1,2 ... N
Equation (4) can use dynamic variable ωiAnd δiIt is written over, dynamic variable ωiFor system frequency and δiFor mode
Damping ratio, the two are defined as foloows：
The Rayleigh equation of damping ratios is the good approximation of nonlinear dampling, especially for multi-piece assemblies：
ci=a0mi+a1ki (7)
Equation (7) is substituted into equation (6), can modal damping be rewritten according to intrinsic frequency：
Wherein αoAnd α1For constant, quality and stiffness characteristics depending on system.
Function (8) is shown in FIG. 10.
The paddle response obtained in geometric coordinate can be superimposed from what each single mode contributed relevant displacement.
Obviously, reducing each single mode displacement contribution leads to the reduction of blade Whole Response, and therefore reduce on blade
Loading effect.
Single mode contribution is critically dependent on two master mode parameters listed above：Frequency and modal damping.Such as Figure 10 institutes
Show, reduce blade frequencies lead to higher damping, it means that the reduction of paddle response and, again, the load on blade
The reduction of lotus.
Therefore, in the art to a kind of connecting element there are a kind of demand, for identical radial dimension and
Under identical load, which allows blade assembly compared with prior art to obtain higher displacement and therefore with higher
Neutralization effect.
Invention content
Therefore, it is an object of the present invention to provide a kind of connecting element for industrial axial flow blower, it is adapted to allow for blade
When being subjected to unstable load, stress and change its characteristics of mode：Frequency and deformed shape.It is of the invention in the target
One purpose be to provide it is a kind of for aerofoil profile is connected to axis stream industrial fan wheel hub connecting element, be suitable for by
The influence of fluctuatingload on blade system minimizes.
To be suitable under general state and especially resonance state more specifically, it is a further object to provide one kind
Reduce connecting element of the blade to the response of alternate load.
It is a further object to provide a kind of connecting elements, relative to system well known in the prior art, permit
Perhaps the intrinsic frequency of the system is minimized；For the first pattern, associated damping ratios prior art solution
Higher, and for higher pattern, associated damping is relatively low.In order to reach this target and these and other purpose
(they will become more fully apparent from following detailed description of preferred embodiment, and the preferred embodiment is merely illustrative
Rather than limitation of the present invention), there is rectangular cross section and the connecting element of " L " shape longitudinal section the present invention provides a kind of, "
The short side of L " is connect with wheel hub, and long side is connected with profile, and the general ratio between this both sides is 0.1.
The intrinsic frequency of the natural frequency ratio known system of blade system including connecting element according to the present invention is low；It is right
In the first pattern, the higher of associated damping ratios prior art solution and for higher pattern, it is associated
Damping it is relatively low.Due to the distribution of exciting force, only head Three models have paddle response significant contribution；So as to greatly subtract
Weak response of the blade to cyclic loading.In addition, exciting cyclic loading with space (radial direction) be distributed, amplitude according to the following formula with
Time correlation：
F (x, t)=g (x) h (t) (9)
Wherein：
G (x) is the function of radial position
H (x) is periodic function
This means that after half period, Forcing function is with identical amplitude but with opposite symbol.This is
The deformed shape of system does not have identical symmetry, because constraint is not symmetrical, preferably as shown in Figure 3a and 3b shown.As this
First main result of kind certain variations mode, paddle response are preferably inhibited.As second as a result, the intrinsic frequency of blade
It is not constant, therefore there is no practical resonance states.(increase accordingly, with respect to the blade system of the prior art due to responding
By force, generally can not be operated in the big velocity interval around critical speed), for including connecting element according to the present invention
The blade system part of the present invention (system be also), which is substantially reduced, and in many cases, fortune
Row velocity interval is unrestricted.
Relative to the prior art, connecting element permission according to the present invention reduces under general state and especially resonance state
Response of the blade system to alternate load.
The brief description of accompanying drawing
Other features and advantages of the present invention will be merely illustrative of the disclosure rather than limiting and from following appended attached
It is become apparent in the detailed description of preferred embodiment shown in figure, wherein：
Fig. 1 a, 1b, 2a, 2b, 2c, 2d, 2e, 2f are shown according to prior art for the blade assembly of axial flow blower
Different examples；
Fig. 3 a and 3b show two deformation states of the blade system including connecting element according to the present invention；
Fig. 4 a and 4b show the power acted on the blade system including connecting element according to the present invention；
Fig. 5 expressions are connected to the side view of the blade of wheel hub by connecting element according to the present invention；
Fig. 6 shows the top view of connecting element according to an embodiment of the invention；
Fig. 7 shows the connecting element of Fig. 6 perspective view after bending；
Fig. 8 shows connecting element according to the second embodiment of the present invention, is obtained by continental extrusion or stretching；
Fig. 9 shows the side view of the connecting element of Fig. 8, wherein it can be noted that, it can by squeeze out or stretch acquisition
Thickening in the cross section of variation and most critical zone；
Figure 10 represents curve graph, and it illustrates the modal dampings of the function of the intrinsic frequency as blade assembly；
Figure 11 a and 11b represent that connecting element according to the present invention is flipped up and downwardly turns over respectively it is different can
It can arrangement；
Figure 12 shows the example of the installation of the industrial axial flow blower including blade assembly, which is included according to this
The connecting element of invention；
Figure 13 shows the connecting element according to the present invention for being bolted to wheel hub；
Figure 14 shows connecting element according to the third embodiment of the invention, wherein between two parts of connecting element
Angle realizes the pre- cone angle of blade；
Figure 15 and 16 shows connecting element according to the third embodiment of the invention, wherein with different but easy way
Obtain pre- cone angle.
The detailed description of the present invention
With reference to above-mentioned attached drawing, main task of the invention is to provide one kind and is used to aerofoil profile being connected to industrial axis stream wind
Connecting element on the wheel hub of machine.
With reference to above-mentioned, the present invention relates to a kind of connecting element 1 being made of very simple element, see, for example, Fig. 5 extremely
7, there is the longitudinal section of substantially rectangular cross section and " L " shape, including the first part 1a with substantially straight extension and
Second part 1b, the first part 1a and second part 1b with straight extension are by being presented the coupling part of radius of curvature
1c connections so that the first part 1a and second part 1b is located in substantially perpendicular plane.
The first part 1a (it is shorter part) of L-shaped profile, is easily connected on wheel hub 20, and second
Part 1b (its be longer part), is easily connected to aerofoil profile 10, the coupling part 1c by short part 1a with it is described
Long part 1b is connected.
Blade system 100 including connecting element 1 according to the present invention is also the part of the present invention.
For industrial axial flow blower blade system 100 the characteristics of be following truth：Bear the blade of fluctuatingload
Stress and change its characteristics of mode：Frequency and deformed shape, as described above.
Functional test has been carried out to include the blade system of connecting element 1 according to the present invention in the present inventor
100 are compared with prior art systems.As a result, it was confirmed that using the connecting element 1 of the present invention, the natural frequency ratio of the system shows
There is low 20% in technology, the damping ratios of three kinds of vibration modes of head is than the identical damping ratio of blade system according to prior art
Rate distinguishes high by 24%, 15% and 3%, only fourth mode low 4%.Consider the general loading condition of blade system, four kinds of moulds of head
The opposite coefficient that participates in of formula is respectively 0.43,0.24,0.14 and 0.09；Therefore, by the superposition of the response to these four patterns,
Response of the blade to load system has been fully described.
Due to the difference of damping ratio, the peak response phase of the blade system 100 of the connecting element 1 for including innovation of the invention
22% is reduced for the response of the blade system of the prior art.It is proportional to consider that the load on blade is responded to it, the present invention relates to
And to acting on being substantially reduced for the load on blade.
In addition, it is asymmetry that connecting element 1 according to the present invention, which has another extremely important characteristic,.
Influence of these factors to the system action is illustrated below in reference to Fig. 3 a and Fig. 3 b.
During operation, steady state force (weight W and lifting force L) tends to blade 10 is made to be deformed into similar to cantilever beam
The shape of one vibration mode.
Meanwhile centrifugal force C tends to cancel out the deformable blade.
By the influence that centrifugal force C is generated according to the displacement of center of gravity linear change, according to the length of blade attachment then
It does not terminate in and linearly changes.
For identical radial dimension and under identical load, blade system of the invention is included relative to the prior art
Connecting element have longer length connecting element, be capable of providing higher blade displacement, and therefore than in the prior art
Known blade has higher neutralization effect.
From Fig. 5 to 7 as can be seen that the structure of connecting element 1 according to the present invention and profile manufacture are very simple.
Its distinctive feature still being kept, connecting element 1 can be realized by several different methods, with currently may be used in the market
The connecting element of acquisition is compared, and allows to obtain low-down production cost.
Due to the connecting element of the present invention, the further advantage that blade system of the invention is obtained is as follows：
Connecting element 1 can be obtained by simple fabrication process, including according to required shape from aluminium sheet, steel plate or other
The the first cutting stage and the second drilling stage and last bending stage that suitable material starts (with reference to figure 5 to 7)；
The connecting element 1 can be by including for the first cutting stage the semi-finished product by squeezing or stretching
It is obtained (with reference to Fig. 8 and 9) with the manufacturing process in the second drilling stage；
It is appreciated that such extruding allows easily to realize different shapes, this can obtain more important advantages：
For example, when predicting higher stress, i.e., in wheel hub bonding pad, larger thickness can be provided, (with reference to figure 9)；
The connecting element 1 can be by since by stretching made of plastics or glass fiber material or molded element
Manufacturing method including the first cutting stage and the second drilling stage obtains；
The connecting element 1 can be by including the first cutting stage and the second drilling since simple " L " shape profile
The manufacturing method in stage obtains.
L-shaped connecting element according to the present invention can finally be combined to improve its effect with the system of the prior art.
Its asymmetrically shape is by another advantage that connecting element according to the present invention obtains：It is not right due to L-shaped
Claim profile, connecting element 1 can be assembled into (Fig. 5 a and 5b) coupling part 1c and is flipped up or downwardly turns over：The connecting element is not
Symmetric shape permission needs that blade Plane of rotation is raised and lowered according to installation (with reference to figure 12).
Certainly, according to operation duty ratio, which can use one or more bolts to be fixed on wheel hub 20 (reference
Figure 13).
Claims (13)
1. for blade (10) to be connected to the connecting element (1) of the wheel hub (20) of industrial axial flow blower, the connecting element (1)
It is implemented with single-piece L-shaped part, including first part (1a) and second part (1b), the first part has substantially straight prolong
It stretches, the second part has substantially straight extension, and the first part (1a) and the second part (1b) pass through connection
Partly (1c) is connected, and radius of curvature is presented in the coupling part, and the first part (1a) and second part (1b) are positioned at essence
In upper perpendicular plane.
2. connecting element (1) according to claim 1, which is characterized in that the first part (1a) and second described
Dividing (1b), the angle realizes the pre- cone angle of blade directly in the connecting element in the plane being in the tilted angle, without
It is the realization pre- cone angle of blade on the wheel hub.
3. connecting element (1) according to claim 1, which is characterized in that the first part (1a) is than described second
Divide (1b) short.
4. connecting element (1) according to claim 1, which is characterized in that the connecting element has quadrangular cross section.
5. connector (1) according to claim 1, which is characterized in that the connector has rectangular cross section.
6. the connecting element (1) according to one or more of preceding claims, which is characterized in that the connecting element
It is made of metal material.
7. the connecting element (1) according to one or more of preceding claims, which is characterized in that the connecting element
It is made of plastic material.
8. the connecting element (1) according to one or more of claim, which is characterized in that the connecting element is by glass
Glass fibrous material is made.
9. the connecting element (1) according to one or more of preceding claims, it is characterised in that：The connecting element
It is obtained by the manufacturing method included the following steps：
The plate of metal, plastics or glass fiber material is provided；
Cut simultaneously metallic plate described in drilling；
The plate benging of simultaneously drilling will have been cut, has obtained final L-shaped part.
10. the connecting element (1) according to one or more of preceding claims, it is characterised in that：The connection member
Part is obtained by the manufacturing method included the following steps：
Semi-finished product by squeezing out or stretching are provided；
Cut simultaneously semi-finished product described in drilling；
The blank bent of simultaneously drilling will have been cut.
11. a kind of blade assembly (100) of industry axial flow blower, including：
Blade (10),
Wheel hub (20),
Connecting element (1),
It is characterized in that, the connecting element (1) is implemented with single-piece L-shaped part, including first part (1a) and second part
(1b), the first part is shorter, has a straight extension, and the second part has a substantially straight extension, described first
Point (1a) and the second part (1b) are connected by coupling part (1c), the coupling part presentation radius of curvature, and described the
A part of (1a) and second part (1b) are in perpendicular plane.
12. blade assembly (100) according to claim 11, which is characterized in that the first part (1a) and described
Two parts (1b) are connected by coupling part (1c), and radius of curvature, the first part (1a) and institute is presented in the coupling part
Second part (1b) is stated in the plane being in the tilted angle, the angle realizes that blade is bored in advance directly in the connecting element
Angle rather than the realization pre- cone angle of blade on the wheel hub.
13. blade assembly (100) according to claim 11, which is characterized in that the first part (1a) is than described
(1b) is short for two parts, and the first part (1a) of wherein described connecting element (1) be connected to the wheel hub (20) and
The second part (1b) of the connecting element (1) is connected to the blade (10).
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 |
|---|---|
| CN108138786A true CN108138786A (en) | 2018-06-08 |
Family
ID=54697535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580083690.4A Pending CN108138786A (en) | 2015-10-16 | 2015-10-16 | For the connecting element of wheel hub being connected to blade in industrial axial flow blower and the blade system for including the 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 |
|---|---|---|---|---|
| BR112016026558B1 (en) * | 2014-05-13 | 2022-03-03 | R.E.M. Holding S.R.L | BLADE FOR INDUSTRIAL AXIAL FAN AND INDUSTRIAL AXIAL FAN INCLUDING SUCH 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 |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20180291913A1 (en) | 2018-10-11 |
| WO2017063712A1 (en) | 2017-04-20 |
| RU2697001C1 (en) | 2019-08-08 |
| EP3362689A1 (en) | 2018-08-22 |
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Application publication date: 20180608 |