CN102588340A - Fan impeller with preset taper angle - Google Patents
Fan impeller with preset taper angle Download PDFInfo
- Publication number
- CN102588340A CN102588340A CN2012100966696A CN201210096669A CN102588340A CN 102588340 A CN102588340 A CN 102588340A CN 2012100966696 A CN2012100966696 A CN 2012100966696A CN 201210096669 A CN201210096669 A CN 201210096669A CN 102588340 A CN102588340 A CN 102588340A
- Authority
- CN
- China
- Prior art keywords
- blade
- impeller
- fan impeller
- cone angle
- 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.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a fan impeller with a preset taper angle, which belongs to the fan impeller, and solves the problem that the existing fan impeller has poor impeller bearing capacity and poor operation safety coefficient. A blow dryer of the fan impeller comprises a plurality of same blades, the root of the blade handle of each blade is respectively fixed on a blade fixing seat, and each blade fixing seat is arranged on a wheel hub in the center of the blow dryer; the blade fixing seat is inclined to the horizontal plane to form a taper angle beta so that the center line of the blade and a vertical plane of an impeller rotating shaft form the taper angle beta. The fan impeller provided by the invention improves the loading condition of the blade handle, improves the bearing capacity of the impeller, and expands the application range of the pultruded blade; the maximum impeller diameter can reach 6-6.3m, and the safety coefficient of the operation of the blade handle is about 2.5 times higher than that of the existing product; and the fan adopting the impeller provided by the invention can obtain the expectant effect of exhausting waste heat in the operation process, and has good economic effect.
Description
Technical field
The present invention relates to draught fan impeller, refer in particular to a kind of draught fan impeller that presets a cone angle.
Background technique
In commercial production and daily life, tend to produce a large amount of used heat, have only these used heat of timely discharge, just can keep normal production and life.Industrialization degree reaches all the more; People's living standard is high more; Need the used heat of discharge just many more, the drawback of generation is also many more, in the routine Fukushima, Japan nuclear power plant accident; Be exactly because cooling tower outage cisco unity malfunction causes the used heat of nuclear reaction generation to fail discharge in time and produced catastrophic consequence.
Blower fan is industrial at present and civilian ventilator commonly used.It is widely used in cooling tower, air cooling device and mixed ventilation cooling tower.Blower fan is the critical piece of these mechanical ventilator, and its major function is to change mechanical energy into aerodynamic energy, forces gas flow, to realize cold and hot exchange, reaches the purpose of getting rid of said used heat.
Along with blower fan output and the people raising to environmental consciousness, formed by extrusion and tension technology is used for the blade production and processing and is generally adopted just abroad in recent years.Defectives such as pultrusion molding process has overcome the instability that traditional hand is stuck with paste the handicraft product quality, and labor intensity is big, and production environment is poor, and labour productivity is low.The past people always think that the blade transmission efficiency of formed by extrusion and tension explained hereafter is than mold pressing; The blade of explained hereafter such as vacuum forming is low; Little air duct test through standard; Select suitably if find blade profile, the fan efficiency of formed by extrusion and tension explained hereafter is poor unlike the fan efficiency of traditional mold pressing or the production of vacuum forming tratitional technology.The producer of present domestic formed by extrusion and tension explained hereafter blower fan is more and more, and the material of blade also has nothing in common with each other, have the glass fibre reinforced plastics material have aluminum alloy have stainless steel etc.But receive the restriction of petiole intensity, the blower fan diameter of being produced is all less than 4.5 rice diameters.
Usually the exploitation of blade at first will be confirmed user's requirement, some customer requirements efficiency comes first, and some user more is concerned about the size of noise.According to the selected blade profile of user's requirement, confirm the blade profile shape.Considered because sectional dimension is more little, is selected the machine drawing model satisfying little that sectional dimension is tried one's best more easily during design blade profile shape, can save material again and reduce production costs.At present, owing to receive the restriction of broaching machine tonnage, it is too big that the sectional dimension of blade can not be done, otherwise can't process.
Existing fan blade sectional shape is seen Fig. 1, and the maximum petiole diameter d of blade is 48mm at present, and blade angle α confirms that according to the demands of different of airflow pressure symbol Y is the windward side among the figure.
Referring to Fig. 2; In the existing draught fan impeller air duct 21; The petiole root of blade 22 links through fixed base 23 and wheel hub 24; Traditional impeller is designed to the center line of petiole mostly perpendicular to impeller rotating shaft 25 (see figure 2)s, and the direction of arrow shown in the C is the impeller air-out direction among Fig. 2, and the direction of arrow shown in the F is the blower fan sense of rotation.The advantage of this impeller is simple in structure; Easy for installation; But blade 22 as a very long overhang; The aerodynamic load that distributes can produce very big moment of flexure with the own wt of blade to root of blade, and this moment of flexure changes and corresponding the change along with cycle of circumferential airspeed, and blade 22 tired damage takes place under big alternation moment of flexure effect easily encircles.
Because squeezing draws blade petiole maximum diameter can't do greatly by the restriction of blade profile shape; Receive the restriction of petiole intensity, the bearing capacity of blade also just is restricted, and impeller diameter also can't be done greatly; Can only make the minor diameter blower fan, big limitations squeeze the using scope of drawing blade.
Referring to Fig. 3; Abroad occurred in recent years becoming blade to make the hinged structure of flapping action up and down around flapping hinge impeller design, in the impeller air duct 31, the petiole root of blade 32 links through hinged securement seat 33 and wheel hub 34; Blade 32 can be swung up and down in B-B ' intercropping; This structure is mainly born on the plane of petiole rotation because the tensile stress that centrifugal force produces, because petiole made by steel, the ability of bearing tensile stress adds big many of the ability of tensile stress than bearing flexural stress; So just improved the stressing conditions of root of blade greatly; Shortcoming is to have increased one degree of freedom, and if structure design is improper to be easy to produce blade and to swing up and down for a long time and phenomenon such as vibration takes place, and influences safe operation.Blade departs from the viewpoint definition that horizontal plane sinks in flapping action be blade angle of flap θ, and flapping hinge is decided to be Offset e apart from the distance of rotating center.Force analysis such as Fig. 4 in proper functioning of blade among Fig. 3-shown in Figure 8: abscissa all is expressed as substantially horizontal with S-S among the figure, and y coordinate is all represented the Vertical direction vertical with S-S, the size of arrow length signal power, and e is said Offset.
Wherein, Fig. 4 receives the schematic representation of gravity Z for blade; Fig. 5 receives the schematic representation of centrifugal force L for blade; Fig. 6 receives the schematic representation of aerodynamic force Q for blade; Fig. 7 is waved the schematic representation of inertial force G for blade; Fig. 8 receives the synthetic schematic representation of each power (the gravity Z among Fig. 4-Fig. 7, centrifugal force L, aerodynamic force Q, wave inertial force G) for blade.
The above-mentioned inertial force G that waves is meant: must be designed to the structure of very big damping constant waving hinged place; The blade that the moment unbalance of blade is produced swings up and down as early as possible, and decay reaches transient equiliblium; So also there is moment obstruction in blade in the process of waving it is waved; When blade reaches steady running; These should be zero to the moment sums that swing up and down that flapping hinge produces, that is: the commentaries on classics that is produced by centrifugal force adds that apart from the torque that same leaf weight (gravity) produces the moment sum that aerodynamic force produces balances each other, and torque is zero. wave that to be created on the whole moving element direction opposite with movement tendency.
Summary of the invention
The objective of the invention is provides a kind of bearing capacity that can improve impeller to have the draught fan impeller that presets cone angle of higher operating safety factor simultaneously in order to solve the problem that existing technology exists.
The objective of the invention is to realize through following technological scheme:
A kind of draught fan impeller that presets cone angle is characterized in that:
Comprise in the air duct of said draught fan impeller: the blade that several are identical, the petiole root of each blade are individually fixed on the vanes fixed seat, and each vanes fixed seat is installed on the wheel hub that is in air duct central authorities;
Said vanes fixed seat and the horizontal plane cone angle beta that tilts, the center line that makes blade forms a cone angle beta with the vertical plane of impeller rotating shaft.
Said cone angle beta is 2.5 degree～5 degree.
Said petiole is the hollow steel pipe structure.
Said petiole steel pipe is selected 45 steel for use.
Beneficial effect of the present invention:
Through the present invention the fixing seat of fan blade angle of setovering is installed; Make draught fan impeller preset a cone angle; The draught fan impeller that a cone angle is preset in employing can play with existing hinged securement seat same improve the stressed effect of root of blade; Can improve the stressing conditions of petiole widely, improve the bearing capacity of impeller, enlarge and squeezed the application area of drawing blade.Adopt blade wheel structure of the present invention, blower fan petiole place diameter is 48 millimeters, and the maximum impeller diameter can reach 6-6.3 rice (existing maximum impeller diameter can only be accomplished 4.5 meters), and the safety coefficient of petiole operation is higher about 2.5 times than existing.Through facts have proved, the blower fan of employing impeller of the present invention is in operation and has obtained the eliminating used heat effect of expection, and has produced the better economic effect.
For further specifying above-mentioned purpose of the present invention, structural feature and effect, below will combine accompanying drawing that the present invention is elaborated.
Description of drawings
Fig. 1 is existing fan blade sectional shape schematic representation;
Fig. 2 is the structural representation of conventional fan impeller;
Fig. 3 is existing hinged blade wheel structure schematic representation;
Fig. 4 receives the schematic representation of gravity for the blade of impeller among Fig. 3;
Fig. 5 receives the schematic representation of centrifugal force for the blade of impeller among Fig. 3;
Fig. 6 receives the schematic representation of aerodynamic force for the blade of impeller among Fig. 3;
Fig. 7 is waved the schematic representation of inertial force for the blade of impeller among Fig. 3;
Fig. 8 receives gravity, centrifugal force, aerodynamic force for the blade of impeller among Fig. 3 and waves the synthetic schematic representation of inertial force;
Fig. 9 presets the draught fan impeller structural representation of cone angle for the present invention.
Embodiment
Accompanying drawing specific embodiments of the invention below in conjunction with embodiment is elaborated.
The present invention be through to 1.2 meters blower fans to the hinged impeller of 6 rice diameters under different working conditions, calculate and statistics impeller balance after actual angle of flap scope, angle of flap θ scope was 2.5 to 5 degree when consequently impeller reached balance.But because the blade of hinged impeller swings up and down phenomenons such as vibration can take place for a long time; For overcoming this drawback; The present invention is designed to an angle (cone angle) with the seat that installs and fixes of blade; Can play moment that the centrifugal moment that is produced by centrifugal force comes partial equilibrium to be produced by leaf weight (gravity) and aerodynamic force when blade rotates equally; The suffered moment of flexure of root of blade is played the effect of unloading, and can not produce the phenomenon of blade vibration, designed the draught fan impeller that presets a cone angle with offloading functions as shown in Figure 9 in view of the above.
Referring to Fig. 9, the draught fan impeller structure that presets cone angle of the present invention is following:
Comprise in the air duct 91 of draught fan impeller of the present invention: several identical blades 92; The petiole root of each blade 92 is individually fixed on the vanes fixed seat 93; Each vanes fixed seat 93 is installed on the wheel hub 94 that is in air duct 91 central authorities; Therefore each blade 92 vanes fixed seat 93 and wheel hub 94 through separately links, and each vanes fixed seat 93 and the horizontal plane cone angle beta that tilts is installed on the wheel hub 94 (having vanes fixed seat 23 now among Fig. 2 is that level is installed on the wheel hub, so itself and horizontal plane cone angle beta are 0 °); Make the center line of blade 92 β angle of vertical plane formation with impeller rotating shaft; When confirming angle of taper, it can not be too little, and the too little unloading effect of angle is limited; Also should not be too big; Too greatly can be influential to impeller diameter and installation, also may oppositely load blade, the cone angle beta selection 2.5 of for this reason vanes fixed seat 93 and horizontal plane being tilted is spent～5 degree and is preset (according to rotational speed; Air quantity; The difference of blast is selected different cone angles), adopt cone angle beta=3.5 ° to be advisable generally speaking.When adopting the blade rotation of this spline structure, the centrifugal force of generation can produce a moment and come balance by the moment that gravity and aerodynamic force produce, and reduces the moment of torsion that the petiole root is born.The direction of arrow shown in the C is the impeller air-out direction among Fig. 9, and the direction of arrow shown in the F is the blower fan sense of rotation.
In addition, because blade is away from rotating center, blade should be made gently as far as possible, and this balance to impeller is favourable.From Analysis of materials mechanics, more little the closer to the material of heart portion to the influence of part resistance to flexure for cylindrical component.Petiole amid all these factors of the present invention is designed to hollow steel pipe structure (selecting 45 steel for use), can alleviate leaf weight and improve the blade quality.
Fig. 9 two embodiments that pass the imperial examinations at the provincial level:
1, impeller diameter D is 6 meters a blower fan
Impeller diameter D=6000mm, hub diameter Dh=1200mm, petiole diameter d=48mm, the long Lb=2390mm of blade, carry out theoretical calculation (computational methods that adopt in the industry) to the safety coefficient at blower fan petiole place:
During β=3.5 °, the safety coefficient at blower fan petiole place is 4.138;
During β=0 °, the safety coefficient at blower fan petiole place is 1.80.
2, impeller diameter D is 4.5 meters a blower fan
Impeller diameter D=4500mm, hub diameter Dh=635mm, petiole diameter d=48mm, the long Lb=1920mm of blade, carry out theoretical calculation (computational methods that adopt in the industry) to the safety coefficient at blower fan petiole place:
During β=3.5 °, the safety coefficient at blower fan petiole place is 4.6;
During β=0 °, the safety coefficient at blower fan petiole place is 1.81.
Through theoretical calculation, can find out that effect that blade presets a cone angle still clearly to the safety coefficient at the blower fan petiole place of different-diameter.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the object of the invention; And be not with opposing qualification of the present invention; As long as in essential scope of the present invention, all will drop in the scope of claim of the present invention the above embodiment's variation, modification.
Claims (4)
1. draught fan impeller that presets cone angle is characterized in that:
Comprise in the air duct of said draught fan impeller: the blade that several are identical, the petiole root of each blade are individually fixed on the vanes fixed seat, and each vanes fixed seat is installed on the wheel hub that is in air duct central authorities;
Said vanes fixed seat and the horizontal plane cone angle beta that tilts, the center line that makes blade forms a cone angle beta with the vertical plane of impeller rotating shaft.
2. the draught fan impeller that presets cone angle as claimed in claim 1 is characterized in that:
Said cone angle beta is 2.5 degree～5 degree.
3. the draught fan impeller that presets cone angle as claimed in claim 1 is characterized in that:
Said petiole is the hollow steel pipe structure.
4. the draught fan impeller that presets cone angle as claimed in claim 1 is characterized in that:
Said petiole steel pipe is selected 45 steel for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100966696A CN102588340A (en) | 2012-04-01 | 2012-04-01 | Fan impeller with preset taper angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100966696A CN102588340A (en) | 2012-04-01 | 2012-04-01 | Fan impeller with preset taper angle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102588340A true CN102588340A (en) | 2012-07-18 |
Family
ID=46477440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100966696A Pending CN102588340A (en) | 2012-04-01 | 2012-04-01 | Fan impeller with preset taper angle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102588340A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500448A (en) * | 2014-12-14 | 2015-04-08 | 惠阳航空螺旋桨有限责任公司 | Axial flow cooling tower fan |
| CN108138786A (en) * | 2015-10-16 | 2018-06-08 | 雷姆控股有限公司 | 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 |
| CN111492145A (en) * | 2017-12-26 | 2020-08-04 | 三菱电机株式会社 | Rotating blade, axial flow fan and ceiling fan |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58211598A (en) * | 1982-06-03 | 1983-12-09 | Nippon Seiko Kk | Automatically variable pitch type fan assembly |
| DE3910784A1 (en) * | 1989-04-04 | 1990-10-18 | Hans Schilder | Reversible rotor blade (180@) |
| CN2823617Y (en) * | 2005-07-22 | 2006-10-04 | 盛才良 | Large axial flow fan with zero bending monent structure blade root |
| CN101858361A (en) * | 2010-05-19 | 2010-10-13 | 威海克莱特菲尔风机有限公司 | Axial-flow impeller having blade hinged with wheel hub |
| CN202628610U (en) * | 2012-04-01 | 2012-12-26 | 上海尔华杰机电装备制造有限公司 | Fan impeller with preset taper angle |
-
2012
- 2012-04-01 CN CN2012100966696A patent/CN102588340A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58211598A (en) * | 1982-06-03 | 1983-12-09 | Nippon Seiko Kk | Automatically variable pitch type fan assembly |
| DE3910784A1 (en) * | 1989-04-04 | 1990-10-18 | Hans Schilder | Reversible rotor blade (180@) |
| CN2823617Y (en) * | 2005-07-22 | 2006-10-04 | 盛才良 | Large axial flow fan with zero bending monent structure blade root |
| CN101858361A (en) * | 2010-05-19 | 2010-10-13 | 威海克莱特菲尔风机有限公司 | Axial-flow impeller having blade hinged with wheel hub |
| CN202628610U (en) * | 2012-04-01 | 2012-12-26 | 上海尔华杰机电装备制造有限公司 | Fan impeller with preset taper angle |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500448A (en) * | 2014-12-14 | 2015-04-08 | 惠阳航空螺旋桨有限责任公司 | Axial flow cooling tower fan |
| CN108138786A (en) * | 2015-10-16 | 2018-06-08 | 雷姆控股有限公司 | 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 |
| CN111492145A (en) * | 2017-12-26 | 2020-08-04 | 三菱电机株式会社 | Rotating blade, axial flow fan and ceiling fan |
| CN111492145B (en) * | 2017-12-26 | 2022-04-05 | 三菱电机株式会社 | Rotating blade, axial flow fan and ceiling fan |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105628531B (en) | Continuous high-temperature high speed Dual-Phrase Distribution of Gas olid erosion abrasion test device | |
| CN100390406C (en) | Improved turbine | |
| CN101283182B (en) | Wind turbine | |
| CN102588340A (en) | Fan impeller with preset taper angle | |
| CN105756975A (en) | Axial flow fan with blade front edges having groove structures and with blade root blowing effect | |
| CN107084158A (en) | A kind of axial flow blower stator blade denoising structure based on memorial alloy | |
| CN202628610U (en) | Fan impeller with preset taper angle | |
| CN2214354Y (en) | Propeller cap with adaptive inflow fin | |
| CN104653515B (en) | A kind of double-suction type centrifugal fan | |
| CN101949353A (en) | Tunnel diffusion draught fan | |
| CN1004092B (en) | Wind energy converter | |
| CN203867943U (en) | Double-suction type centrifugal fan for cooling and heat dissipation of power generator | |
| CN209340209U (en) | Asymmetric both sides air inlet impeller, centrifugal blower and kitchen ventilator | |
| CN110683048B (en) | Unmanned helicopter composite material blade and blade tip counterweight method | |
| CN104214043B (en) | Low rate start can provide the combined type vertical shaft fan wind wheel system of lift efficiently | |
| CN110513244A (en) | A kind of adjustable wind wheel apparatus of omnidirection for wind-power electricity generation | |
| CN208935500U (en) | A kind of gravity type automatic flow control valve | |
| CN106586024A (en) | Rotor system aerodynamic performance comprehensive evaluation method | |
| CN2634159Y (en) | Novel transformer cooling fan | |
| CN205308253U (en) | Take axial -flow type stirring rake of blade tip winglet | |
| CN201636081U (en) | Backward-tilting type volute-free centrifugal fan | |
| CN101936296A (en) | Low-carbon technology dual-purpose axial flow fan | |
| CN112893122A (en) | Novel double-guide air-equalizing efficient powder concentrator | |
| CN206131858U (en) | Balanced automatic regulating apparatus of cooling tower amount of wind | |
| CN201284757Y (en) | Centrifugal blower and air conditioner employing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120718 |