CN204276130U - A kind of HP type coal pulverizer vane flabellum - Google Patents
A kind of HP type coal pulverizer vane flabellum Download PDFInfo
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- CN204276130U CN204276130U CN201420643080.8U CN201420643080U CN204276130U CN 204276130 U CN204276130 U CN 204276130U CN 201420643080 U CN201420643080 U CN 201420643080U CN 204276130 U CN204276130 U CN 204276130U
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Abstract
A kind of HP type of the utility model coal pulverizer vane flabellum, it is characterized in that, cross section is aerofoil profile, comprise leading edge, trailing edge, the upper string of a musical instrument, the lower string of a musical instrument, maximum gauge, wing chord, the length of wing chord is chord length l, described aerofoil profile is symmetrical airfoil, described maximum gauge c is the 21%-24% of chord length, described maximum gauge and leading edge distance a are the 55%-60% of chord length, described leading-edge radius r is the 8%-10% of chord length, the thickness of described trailing edge end face is the 10%-15% of chord length, in an angle X between described trailing edge end face and wing chord, part between described upper string of a musical instrument maximum gauge and trailing edge end face is straight line.The characteristic that its advantage is utilizing fluid to flow through airfoil surface flow velocity to increase, makes to be increased by the air velocity of vane, reduce air by the flow resistance of vane, reduce differential pressure before and after vane, avoid turbulent generation, make vane air-out efficiency higher; And eliminate air throttle ring of the prior art simultaneously, fundamentally eliminate the packing phenomenon of pebble coal on vane and hidden danger of catching fire, provide technical support for coal pulverizer uses high volatile brown coal.
Description
Technical field
The utility model relates to a kind of coal pulverizer vane flabellum, especially a kind of HP type coal pulverizer vane flabellum.
Background technology
In prior art, the simple shape of HP type coal pulverizer vane flabellum blade, does not meet the characteristics of motion of fluid, and the area producing stationary point is comparatively large, and the differential pressure resistance therefore produced is larger; Simultaneously because existing dress vane blade all exists the design feature of " the large tail of microcephaly ", therefore fluid is inevitably producing induced drag by during vane, the whirlpool namely alleged by us.
Be generally as regulating the both air flow modulation block old money vane of wind speed and arrange along the whole circle of vane circumference, therefore the accumulation of pebble coal is very easily caused in reality, particularly vane outer ring regulating block regulates the stop of cover owing to being subject to vane, more should not come off, therefore usually there is pebble coal Ignition Phenomena herein in reality, add during coal pulverizer runs the probability that detonation, fire occur, particularly use the potential safety hazard of high volatile brown coal.
For this microcephaly large tail blunt form structure of current HP type coal pulverizer vane blade shape, and be easy to the defect of long-pending coal, based on hydromechanical principle, constant in the original vane circulation area of maintenance, under the prerequisite that vane whole geometry size remains unchanged, just change the leaf of vane into " wing " shape, reduce air resistance coefficient Cw, reach the object reducing resistance.
The utility model vane renovation technique is higher for the pressure drop existing for HP type coal pulverizer vanes all on domestic market, be easy to the common problem of long-pending coal, do not changing vane and mill bowl, under the prerequisite of vane and primary separator installation site, according to hydromechanical principle, by vane blade, both air flow modulation block considers, again layout, design " aerofoil profile " blade vane meeting fluid motion, realize reducing resistance, improve the flow field of vane outlet, reduce pebble coal discharge capacity, fundamentally eliminate the packing phenomenon of pebble coal on vane, also the potential safety hazard that pebble coal catches fire on vane is namely eliminated, for coal pulverizer uses high volatile brown coal for technical support.
Utility model content
The technical problems to be solved in the utility model is to overcome the common problem that pressure drop in prior art existing for HP type coal pulverizer vane is higher, be easy to long-pending coal.Not changing vane with under the prerequisite of mill bowl, vane and primary separator installation site, according to hydromechanical principle, vane blade, both air flow modulation block being considered, layout again, designing " aerofoil profile " blade vane meeting fluid and move.There is provided a kind of and reduce windage and pressure reduction, reduce turbulent flow, improve a kind of HP type coal pulverizer vane flabellum of the effect of stone coal discharge.
For solving the problems of the technologies described above, the utility model employing technical scheme is:
A kind of HP type coal pulverizer vane flabellum, it is characterized in that, cross section is aerofoil profile, comprise leading edge, trailing edge, the upper string of a musical instrument, the lower string of a musical instrument, maximum gauge, wing chord, the length of wing chord is chord length l, described aerofoil profile is symmetrical airfoil, described maximum gauge c is the 21%-24% of chord length, described maximum gauge and leading edge distance a are the 55%-60% of chord length, described leading-edge radius r is the 8%-10% of chord length, the thickness of described trailing edge end face is the 10%-15% of chord length, in an angle X between described trailing edge end face and wing chord, part between described upper string of a musical instrument maximum gauge and trailing edge end face is straight line.
Described maximum gauge be chord length be 24% of chord length, described maximum gauge and leading edge are apart from being 60% of chord length, and described leading-edge radius is 10% of chord length, and the thickness of described trailing edge end face is 15% of chord length
Described chord length equals HP type coal pulverizer original vane flabellum length.
Described angle X is HP type coal pulverizer original vane flabellum inclination angle.
Described a kind of HP type coal pulverizer vane flabellum is equidistantly installed around vane.
Described HP type coal pulverizer vane flabellum wing chord and horizontal plane angle are X.
Described flabellum trailing edge end face is in same level.
Compared with prior art, a kind of HP of the utility model type coal pulverizer vane aerofoil profile flabellum this kind of " aerofoil profile " blade drag when front face area is identical is minimum.Vane top is not easy long-pending coal, avoids during coal pulverizer runs potential safety hazard detonation occurring, catches fire.Reduce fluid by the flow resistance of vane, the turbulent phenomenon avoiding fluid, serve in reality and reduce differential pressure before and after vane, improve the effect of stone coal discharge; Because novel vane eliminates the air throttle ring of circumferentially whole circle layout, therefore, fundamentally eliminate the packing phenomenon of pebble coal on vane, also namely eliminate the potential safety hazard that pebble coal catches fire on vane, provide technical support for coal pulverizer uses high volatile brown coal.
Examples of implementation:
I all changes this kind of vane by company's 12 coal pulverizers.
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in further detail.
Detailed description of the invention
As shown in Fig. 1 and Tu, a kind of HP type of the utility model coal pulverizer vane flabellum, cross section is aerofoil profile, comprise leading edge, trailing edge, the upper string of a musical instrument, the lower string of a musical instrument, maximum gauge, wing chord, the length of wing chord is chord length l, described aerofoil profile is symmetrical airfoil, described maximum gauge c is the 21%-24% of chord length, described maximum gauge and leading edge distance a are the 55%-60% of chord length, described leading-edge radius r is the 8%-10% of chord length, the thickness of described trailing edge end face is the 10%-15% of chord length, in an angle X between described trailing edge end face and wing chord, part between described upper string of a musical instrument maximum gauge and trailing edge end face is straight line.
The object that vane flabellum is arranged to aerofoil profile is, utilizes fluid to flow through the characteristic of airfoil surface flow velocity increase, increase vane air-out wind speed and air quantity.So-called aerofoil profile and aircraft wing, empennage, missile airfoil, lifting airscrew blade and propeller blade are parallel to the aircraft plane of symmetry or the section shape perpendicular to leading edge.The shape of aerofoil profile has many types, as plano-convex aerofoil profile, biconvex profile, concavo-convex aerofoil profile and symmetrical airfoil etc.The aerofoil profile of usual aircraft wing adopts plano-convex aerofoil profile or biconvex profile, and namely the upper camber line of aerofoil profile is curved comparatively large, and lower camber line camber is less than camber line or is approximately straight line.This aerofoil profile is greater than flow velocity when flowing through lower camber line due to flow velocity when air flows through upper camber line, thus makes the air pressure of camber line side lower than lower camber line side, produces pressure differential, thus makes wing obtain lift.When the camber of upper camber line and lower camber line is equal, be symmetrical airfoil, the air velocity now flowing through camber line and lower camber line all obtains same increase, and therefore produce windage minimum, pressure differential is also minimum, but with also the poorest owing to lacking its lift performance of pressure reduction.But be that this aerofoil profile fan is applied on coal pulverizer vane in the utility model, therefore do not relate to the problem of lift, only utilize the characteristic that symmetrical airfoil windage is minimum.Make to be increased by the air velocity of vane, reduce the flow resistance of air by vane, reduce differential pressure before and after vane, avoid the generation of turbulent flow, make vane air-out efficiency higher.
And when described maximum gauge c is the 21%-24% of chord length, described maximum gauge and leading edge distance a are the 55%-60% of chord length, described leading-edge radius r is the 8%-10% of chord length, when the thickness of described trailing edge end face is in the scope of the 10%-15% of chord length, the windage characteristic of described aerofoil profile is comparatively excellent, can instructions for use be met, therefore adopt the scheme of described aerofoil profile within the scope of this.And driven by gear reduction unit due to the rotation of coal pulverizer impeller, select the little symmetrical airfoil of lift-drag ratio can play the object of protection reductor.Therefore the preferred described aerofoil profile of a kind of HP of the utility model type coal pulverizer vane flabellum is the scheme of symmetrical airfoil.
Part between described upper string of a musical instrument maximum gauge and trailing edge end face is straight line.Its object is to, the camber line of this section of aerofoil is set to straight line and is more conducive to pebble coal from the landing of vane upper surface, avoid pebble coal to pile up.Be the location of straight line when also helping production and processing by the part between upper string of a musical instrument maximum gauge and trailing edge end face, the geometric properties that flabellum is processed is more consistent simultaneously.Therefore the utility model part preferably gone up between string of a musical instrument maximum gauge and trailing edge end face is the scheme of straight line.
A kind of HP type coal pulverizer vane aerofoil profile flabellum described in the utility model, described maximum gauge be chord length for chord length 24%, described maximum gauge and leading edge distance are 60% of chord length, described leading-edge radius is 10% of chord length, when the thickness of described trailing edge end face is 15% of chord length, geometrical property is best, and windage is minimum, and result of use is best.Therefore preferred described maximum gauge be chord length be 24% of chord length, described maximum gauge and leading edge are apart from being 60% of chord length, and described leading-edge radius is 10% of chord length, and the thickness of described trailing edge end face is the scheme of 15% of chord length.
A kind of HP type coal pulverizer vane aerofoil profile flabellum described in the utility model, described chord length equals HP type coal pulverizer original vane flabellum length.Object is to use the mounting groove on original vane, reduces repacking workload, reduces improvement cost.Therefore preferred described chord length equals the scheme of HP type coal pulverizer original vane flabellum length.
A kind of HP type coal pulverizer vane aerofoil profile flabellum described in the utility model, described HP type coal pulverizer vane flabellum is equidistantly installed around vane.Object is, air quantity is evenly equal everywhere to ensure vane, ensures that coal pulverizer runs well.Therefore the scheme that preferred described HP type coal pulverizer vane flabellum is equidistantly installed around vane.
A kind of HP type coal pulverizer vane aerofoil profile flabellum described in the utility model, described HP type coal pulverizer vane flabellum wing chord and horizontal plane angle are X.When to its object is to vane flabellum wing chord and horizontal plane angle be X, airfoil trailing edge end face is level, is conducive to ensureing the stable of air-flow.Therefore preferred described HP type coal pulverizer vane flabellum wing chord and horizontal plane angle are the scheme of X.
A kind of HP type coal pulverizer vane aerofoil profile flabellum described in the utility model, it is characterized in that, described flabellum trailing edge end face is in same level.Object is to ensure air quantity uniformity everywhere further, and the coal dust that coal pulverizer is ground is blown liter fully.Therefore preferred described flabellum trailing edge end face is in same level.
Embodiment in above-described embodiment can combine further or replace; and embodiment is only be described preferred embodiment of the present utility model; not design of the present utility model and scope are limited; under the prerequisite not departing from the utility model design philosophy; the various changes and modifications that in this area, professional and technical personnel makes the technical solution of the utility model, all belong to protection domain of the present utility model.
Accompanying drawing explanation
Fig. 1 is a kind of HP type of the utility model coal pulverizer aerofoil profile vane flabellum schematic diagram.
Fig. 2 is a kind of HP type of the utility model coal pulverizer aerofoil profile vane flabellum scheme of installation.
Chord length l, leading-edge radius r, maximum gauge c, maximum gauge and leading edge distance a, trailing edge end face and chord length angle X.
Claims (7)
1. a HP type coal pulverizer vane flabellum, it is characterized in that, cross section is aerofoil profile, comprise leading edge, leading-edge radius r, trailing edge, trailing edge end face, the upper string of a musical instrument, the lower string of a musical instrument, maximum gauge c, wing chord, the length of wing chord is chord length l, described aerofoil profile is symmetrical airfoil, described maximum gauge c is the 21%-24% of chord length, described maximum gauge and leading edge distance a are the 55%-60% of chord length, described leading-edge radius r is the 8%-10% of chord length, the thickness of described trailing edge end face is the 10%-15% of chord length, in an angle X between described trailing edge end face and wing chord, the part of the described upper string of a musical instrument between maximum gauge and trailing edge end face is straight line.
2. a kind of HP type coal pulverizer vane flabellum according to claim 1, it is characterized in that, described maximum gauge is 24% of chord length, and described maximum gauge and leading edge distance are 60% of chord length, described leading-edge radius is 10% of chord length, and the thickness of described trailing edge end face is 15% of chord length.
3. a kind of HP type coal pulverizer vane flabellum according to claim 1 or 2, is characterized in that, described chord length equals HP type coal pulverizer vane flabellum length.
4. a kind of HP type coal pulverizer vane flabellum according to claim 3, it is characterized in that, described angle X is HP type coal pulverizer vane flabellum inclination angle.
5. a kind of HP type coal pulverizer vane flabellum according to claim 4, it is characterized in that, described a kind of HP type coal pulverizer vane flabellum is equidistantly installed around vane.
6. a kind of HP type coal pulverizer vane flabellum according to claim 5, it is characterized in that, described HP type coal pulverizer vane flabellum wing chord and horizontal plane angle are X.
7. a kind of HP type coal pulverizer vane flabellum according to claim 6, it is characterized in that, described flabellum trailing edge end face is in same level.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420643080.8U CN204276130U (en) | 2014-10-30 | 2014-10-30 | A kind of HP type coal pulverizer vane flabellum |
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| CN201420643080.8U CN204276130U (en) | 2014-10-30 | 2014-10-30 | A kind of HP type coal pulverizer vane flabellum |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108212348A (en) * | 2017-12-20 | 2018-06-29 | 上海电气集团股份有限公司 | A kind of coal pulverizer impeller unit improved method based on CFD technologies |
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2014
- 2014-10-30 CN CN201420643080.8U patent/CN204276130U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108212348A (en) * | 2017-12-20 | 2018-06-29 | 上海电气集团股份有限公司 | A kind of coal pulverizer impeller unit improved method based on CFD technologies |
| CN108212348B (en) * | 2017-12-20 | 2020-03-24 | 上海电气集团股份有限公司 | CFD technology-based coal mill impeller device improvement method |
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