CN104132004B - A kind of cooling fan of use for diesel engine - Google Patents
A kind of cooling fan of use for diesel engine Download PDFInfo
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- CN104132004B CN104132004B CN201410379874.2A CN201410379874A CN104132004B CN 104132004 B CN104132004 B CN 104132004B CN 201410379874 A CN201410379874 A CN 201410379874A CN 104132004 B CN104132004 B CN 104132004B
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Abstract
The invention provides the cooling fan of a kind of use for diesel engine, belong to cooling fan technology field.It solve existing structure and can produce the problems such as vortex disturbance, therefore noise are big, cooling air quantity is little.The cooling fan of this use for diesel engine, including wheel hub, on wheel hub surface, the external circumferential of center circle is intervally distributed with several blades, the angle between the most adjacent two blades on the most front semicircle is gradually increased, angle between the most adjacent two blades on rear semicircle is gradually reduced, described blade includes the root tilted, and the outer end of root is provided with curved portions.In said structure, the direction of corner dimension gradual change can be clockwise, be alternatively counterclockwise.The present invention, in the case of identical impeller diameter, increases cooling air quantity, improves fan cooling ability；Fan noise frequency spectrum can be optimized simultaneously, make noise spectrum the most smooth, reduce the vibration peak of air, it is to avoid blade resonates with air, reduce the noise that cooling fan produces.
Description
Technical field
The invention belongs to cool down fan technology field, refer in particular to the cooling fan of a kind of use for diesel engine.
Background technology
Single cylinder diesel is due to its compact conformation, and the advantages such as cost performance is high, easy maintenance are various countries' agricultural
Fishing is herded industry and is favored, and is widely used as hand tractor, tractor with small four wheels, agricultural tricycle, four-wheel
Car, agricultural irrigation and drainage, spitkit, small engineering machinery, small generator and the master of agricultural avocation processing equipment
Want supporting power.At present, single cylinder diesel year volume of production and marketing in the whole world reaches 9,000,000, and As time goes on,
Its recoverable amount still will be maintained at high value.Advancing by leaps and bounds of single cylinder diesel usage amount accelerates petroleum resources
Consuming, its exhaust emissions, sound pollution also cause serious harm to environment simultaneously, along with people are to guarantor
The most surging and constantly the strengthening awareness of saving energy of retaining ring border cry, national governments are for single cylinder diesel
All proposing dynamic property, economy and the emission performance index request more increased, Diesel Engine Complete Machine is strengthened increasingly,
Power per liter is substantially improved, and its mechanical load and heat load problem highlight all the more.For this to cooling fan
Design is had higher requirement: on the one hand require fan miniaturization, light-weighted on the basis of improve cooling
Fan cooling ability；On the other hand in order to protect environment, require that again reducing cooling fan running as far as possible produces
Sound pollution.
It is known that the fan noise of cooling fan of engine is mainly aerodynamic noise.It is by rotational noise and whirlpool
Flow noise is formed.Rotational noise is mainly rotating vane periodic disturbance air, causes the pressure arteries and veins of air
The noise moved and send, fundamental frequency f=n z/60=(n/60) (360/ θ) hertz of equidistant impeller rotational noise, formula
Middle n is rotation speed of the fan, r/min；Z is the number of blade；θ is the angle of any two adjacent blades and impeller central
For θ.To equidistant blade, provide the number of blade of a fan, then fundamental frequency is a value, passes through fan blade
Frequency (i.e. fundamental frequency f) and integral multiple (i.e. harmonics) place thereof, sound intensity level is substantially much higher than at other frequency,
Especially at f fundamental frequency, peak value is the highest, and noise intensity is maximum.Eddy current crack is the sky making surrounding during fan rotation
Gas produces eddy current, and these eddy current can split into again a series of little eddy current, these whirlpools due to the effect of viscous force
The division of stream and eddy current can make air generation disturbance, forms pressure oscillation, thus inspires noise.Eddy current is made an uproar
Sound is usually wideband noise, when its frequency of vibration and blade natural frequency close to time, system can be produced altogether
Shake so that noise increases.Both noises are all closely related with fan blade molded line, blade layout type.
All using Centrifugal Cooling Fan to reduce the overall dimensions of electromotor at present on air-cooled single-cylinder diesel engine, it is fanned
Leaf great majority use antecurvature, backward leaning vane and blade is contour, the uniform distribution form of spacing, and the number of blade is 20
Individual left and right, and be fixed on together in fan hub.But after using this kind of Centrifugal Cooling Fan, for obtaining
Identical air quantity, fan wheel outside diameter is significantly greater than forward curved vane cooling fan, and contour blade, spacing are equal
Even layout pattern can make fan produce the frequency range composition that some sound pressure levels are the highest when rotating so that fan noise
Higher.Such as the fan that the number of blade is 20, fan is coaxial with bent axle, when diesel engine is 3600r/min, its
Fundamental frequency f is 1200Hz, and i.e. under 600,1200,2400 frequencies, the corresponding noise sound intensity is the highest.For having
Effect increases cooling air quantity, improves fan cooling ability, can substantially reduce fan noise simultaneously, and inventor designs
A kind of low-noise centrifugal cooling fan of 170F air-cooled diesel engine, appropriate design fan blade profile,
Optimize fan blade arrangement form, thus be effectively increased cooling air quantity, reduce fan noise.
Summary of the invention
It is an object of the invention to provide the cooling fan of a kind of air-cooled diesel engine variable pitch impeller, be allowed to not only
Meet diesel engine cooling, noise can be reduced simultaneously.
The object of the present invention is achieved like this:
The cooling fan of a kind of use for diesel engine, including wheel hub, it is characterised in that: on wheel hub surface outside center circle
Circumferentially-spaced several blades that is distributed in side, along clockwise direction between the most adjacent two blades on front semicircle
Angle be gradually increased, angle between the most adjacent two blades on rear semicircle is gradually reduced, described leaf
Sheet includes the root tilted, and the outer end of root is provided with curved portions.In said structure, the side of corner dimension gradual change
Xiang Kewei is clockwise, the most counterclockwise.
In the cooling fan of above-mentioned a kind of use for diesel engine, the radius of the curved portions place circle of described blade
It is 16.5～18.5mm.
In the cooling fan of above-mentioned a kind of use for diesel engine, between the curved portions of described adjacent two blades
Angle is 13.5～22.5 °.
In the cooling fan of above-mentioned a kind of use for diesel engine, described blade has four groups, the blade root often organized
Portion is towards on a circle on the uniform same Radius of circumference on wheel hub surface.
In the cooling fan of above-mentioned a kind of use for diesel engine, the number of described blade is 20, wherein 10
Angle between the adjacent blades of the sheet angle along being gradually increased clockwise, between the adjacent blades of other 10
Along being gradually reduced clockwise.
In the cooling fan of above-mentioned a kind of use for diesel engine, the upper surface of described blade by curved portions to root
Portion is increasingly towards wheel hub, and the angle at inclination angle is 2～3 °.
In the cooling fan of above-mentioned a kind of use for diesel engine, wheel hub and several blades are all to use nylon66 fiber
Injection mo(u)lding.
The fan of present invention design, as diesel engine works at 3600r/min, rotational noise is from former single fundamental frequency frequency
Rate 1200Hz becomes frequency range and is distributed in the range of 960-1600Hz, and in reduction fan noise, those highlight
Line spectrum composition, makes noise spectrum the most smooth, eliminates the regular pressure caused by equidistant blade
Force intensity is disturbed, and owing to the blade adjacent angular angle value of Unequal distance fan is gradual change, therefore Unequal distance fan is each
Individual blade is different from the intensity of fan wind scooper surface impacts, and the phase contrast on adjacent two they strike surfaces is also
Different, the relevant result of this harmonic wave makes in frequency characteristic, equidistant fan peak value quilt at fundamental frequency
Unequal distance fan slackens as the less Distribution Value of numerical value, destroys blade and interferes with fan wind scooper surface
Time the sympathetic response sound of resonant frequency that sent, make compression shock little, and make the OA overall noise level of non-isometric impeller bright
Aobvious decline.The noise making designed centrifugal fan reduces, and the most equal angular blade arrangement pattern subtracts
The little vibration peak of air, it is to avoid blade resonates with air, thus decreases the vibration of blade, fall
The noise that low cooling fan produces.
After outer diameter fan (being determined by flywheel dimension and complete machine structure design arrangement) determines, to fan blade
The radius of curvature of the angle of outlet, inlet angle, the entrance width of blade and blade has carried out multi-parameters optimization, improves
The cooling component of fan, it is ensured that the cooling effect of diesel engine.
The present invention highlights and useful having the technical effect that compared to existing technology
The present invention, in the case of identical impeller diameter, increases cooling air quantity, improves fan cooling ability；With
Time can optimize fan noise frequency spectrum, reduce line spectrum compositions that in fan noise, those are prominent, make noise frequency
Compose the most smooth, and the vibration peak of air can be reduced, it is to avoid blade resonates with air, decreases
The vibration of blade, reduces the noise that cooling fan produces.170F swirl chamber diesel engine is tested and shows, adopt
After the present invention, compared with former machine, total noise of centrifuge declines about 1.6dB, and cooling wind air quantity increases simultaneously,
Diesel engine more former machine of oil temperature when declared working condition runs have dropped 5 DEG C, complete machine normal operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is C-C profile in Fig. 1.
Fig. 3 is the blade construction schematic diagram of the present invention.
Detailed description of the invention
With specific embodiment, the invention will be further described below in conjunction with the accompanying drawings, sees Fig. 13:
The cooling fan of a kind of use for diesel engine, including wheel hub 1, is characterised by: on wheel hub surface outside center circle 2
Circumferentially-spaced several blades 3 that is distributed in side, along clockwise direction between the most adjacent two blades on front semicircle
Angle 4 be gradually increased, angle 4 between the most adjacent two blades on rear semicircle is gradually reduced, described
Blade includes the root 5 tilted, and the outer end of root is provided with curved portions 6.
The radius of the curved portions 6 place circle of described blade is 16.5～18.5mm.
Angle between the curved portions 6 of described adjacent two blades is 13.5～22.5 °
Described blade 3 has four groups, and the root of blade often organized is towards uniform same Radius circumferential on wheel hub surface
On a circle on.
The number of described blade 3 is 20, and wherein the angle between the adjacent blades of 10 is along the most gradually
Increase, angle between the adjacent blades of other 10 is along being gradually reduced clockwise.
Between adjacent blades, angle is incremented by by A to B along clockwise direction, it is thus possible to optimize fan noise frequency spectrum,
Reduce the line spectrum composition that in fan noise, those are prominent, make noise spectrum the most smooth, and can reduce
The vibration peak of air, it is to avoid blade resonates with air, decreases the vibration of blade, reduces cooling wind
The noise that fan produces.After outer diameter fan (being determined by flywheel dimension and complete machine structure design arrangement) determines,
The radius of curvature of the angle of outlet, inlet angle, the entrance width of blade and the blade of fan blade many ginsengs have been carried out
Number optimizes, and determines its structural parameters optimized, thus can increase cooling air quantity, improves fan cooling ability.
The upper surface 7 of described blade is increasingly towards wheel hub by curved portions 6 to root 5, the angle at inclination angle
It it is 2～3 °.
Wheel hub 1 and several blades 3 are all to use nylon66 fiber injection mo(u)lding.
Above-described embodiment is only presently preferred embodiments of the present invention, limits the protection of the present invention the most according to this
Scope, therefore: the equivalence change that all structures under this invention, shape, principle are done, all should contain
Within protection scope of the present invention.
Claims (7)
1. a cooling fan for use for diesel engine, including wheel hub (1), it is characterised in that: center on wheel hub surface
The external circumferential of circle (2) is intervally distributed with several blades (3), on front semicircle successively along clockwise direction
Angle (4) between adjacent two blades is gradually increased, angle between the most adjacent two blades on rear semicircle
(4) being gradually reduced, described blade includes the root (5) tilted, and the outer end of root is provided with curved portions (6).
The cooling fan of a kind of use for diesel engine the most according to claim 1, it is characterised in that: described
The radius of curved portions (6) the place circle of blade is 16.5～18.5mm.
The cooling fan of a kind of use for diesel engine the most according to claim 1, it is characterised in that: described
Angle between the curved portions (6) of adjacent two blades is 13.5～22.5 °.
The cooling fan of a kind of use for diesel engine the most according to claim 1, it is characterised in that: described
Blade (3) has four groups, and the root of blade often organized is towards on uniform same Radius circumferential on wheel hub surface
On circle.
The cooling fan of a kind of use for diesel engine the most according to claim 4, it is characterised in that: described
The number of blade (3) is 20, wherein angle between the adjacent blades of 10 along being gradually increased clockwise,
Angle between the adjacent blades of other 10 is along being gradually reduced clockwise.
The cooling fan of a kind of use for diesel engine the most according to claim 1, it is characterised in that: described
The upper surface (7) of blade is increasingly towards wheel hub by curved portions (6) to root (5), the angle at inclination angle
Degree is 2～3 °.
7., according to the cooling fan of a kind of use for diesel engine described in any one of claim 16, its feature exists
In: wheel hub (1) and several blades (3) they are all to use nylon66 fiber injection mo(u)lding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410379874.2A CN104132004B (en) | 2014-08-04 | 2014-08-04 | A kind of cooling fan of use for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410379874.2A CN104132004B (en) | 2014-08-04 | 2014-08-04 | A kind of cooling fan of use for diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104132004A CN104132004A (en) | 2014-11-05 |
| CN104132004B true CN104132004B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410379874.2A Active CN104132004B (en) | 2014-08-04 | 2014-08-04 | A kind of cooling fan of use for diesel engine |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345526A (en) * | 2017-06-30 | 2017-11-14 | 珠海格力电器股份有限公司 | Impeller, motor element, heat radiation structure and cooking machine |
| CN107448415A (en) * | 2017-08-23 | 2017-12-08 | 联想(北京)有限公司 | A kind of electronic equipment and its radiator fan |
| CN110857701B (en) * | 2018-08-23 | 2021-06-01 | 广东威灵电机制造有限公司 | Blade arrangement method of impeller |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01170800A (en) * | 1987-12-24 | 1989-07-05 | Matsushita Electric Ind Co Ltd | Multi-vane fan |
| CN2054100U (en) * | 1989-04-06 | 1990-03-07 | 陆伟刚 | Involute impeller for rotary fluid machines |
| JP3484854B2 (en) * | 1996-01-18 | 2004-01-06 | 三菱電機株式会社 | Once-through fan |
| CN2359506Y (en) * | 1999-02-01 | 2000-01-19 | 顺德顺威电器有限公司 | Multi-wing centrifugal vane |
| US6514036B2 (en) * | 2001-04-27 | 2003-02-04 | Black & Decker Inc. | Radial flow fan with impeller having blade configuration for noise reduction |
| EP1990545A4 (en) * | 2006-02-08 | 2014-03-12 | Balakirev Evgeni Borisovitch | Radial- flow impeller (variants), a blade therefor and a tube axial fan provided therewith |
| EP2131041B1 (en) * | 2007-03-27 | 2018-08-22 | Mitsubishi Electric Corporation | Sirocco fan and air conditioner |
| JP2009056564A (en) * | 2007-08-31 | 2009-03-19 | Hitachi Koki Co Ltd | Power tool |
| CN204003646U (en) * | 2014-08-04 | 2014-12-10 | 绿田机械股份有限公司 | A kind of cooling fan of use for diesel engine |
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