CN2310889Y - Centrifugal forward and rearward impeller with subcritical leaf - Google Patents
Centrifugal forward and rearward impeller with subcritical leaf Download PDFInfo
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- CN2310889Y CN2310889Y CN 97225687 CN97225687U CN2310889Y CN 2310889 Y CN2310889 Y CN 2310889Y CN 97225687 CN97225687 CN 97225687 CN 97225687 U CN97225687 U CN 97225687U CN 2310889 Y CN2310889 Y CN 2310889Y
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- impeller
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- leaf
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Abstract
The utility model relates to a centrifugal forward and rearward impeller with a subcritical leaf, which belongs to a fan impeller. The centrifugal forward and rearward impeller with a subcritical leaf is mainly composed of blades (1), a wheel hub (2), a front disk (3), a rear disk (4), etc. The utility model is characterized in that a plurality of blades (1) are fixedly connected between the front disk (3) and the rear disk (4); the wheel hub is fixedly connected with the rear disk (4), and the mold surfaces of the blades (1) are composed of two quadratic curves which bend in the reverse direction. The centrifugal forward and rearward impeller with a subcritical leaf has the advantages of energy saving, electricity saving, low noise, easy processing, and long service life. The centrifugal forward and rearward impeller with a subcritical leaf which is a model with the extra fine performance in national and homogeneous blowers at present opens up a new field for the development of the design theory of a blower.
Description
The utility model relates to a kind of centrifugal forward and backward impeller with subcritical blade profile, relate to specifically a kind of be used on mesohigh, pressure and the centrifugal drum of mesolow scope (drawing) blower fan centrifugal forward direction and the back to impeller, refer to especially a kind of novel centrifugal forward direction with subcritical blade profile and the back to impeller.Belong to draught fan impeller.
At present, with the forward direction in mesohigh, middle pressure and the centrifugal drum of mesolow (drawing) blower fan and back, generally only have straight blade, garden arc formula blade, garden arc plate combined blade and aircraft wing type blade etc. always in the industry to impeller.Except that above-mentioned various blades, better blade profile of performance and impeller are not reported so far.Put into practice verified, having the straight-plate-type blade, the centrifugal forward direction of garden arc shaped blade or the two combination type vane and back are to impeller, when being applied on industrial mesohigh, middle pressure and mesolow drum (drawing) blower fan, because their aeroperformances own are poor, the efficient of blower fan is greatly reduced (average about 50～60%), as Y5-48 series induced draught fan etc.Noise increases greatly but that (general A sound level noise LA is greater than 90～95dB); the impeller that has aircraft wing type blade; though its aeroperformance is good; efficient is higher, but noise is also higher, simultaneously its processing difficulties; the cost height; blade is easily punctured by the particulate in the flue gas during use, therefore loses dynamic balancing and scraps, and working life is short.
The inventor works out a kind of centrifugal back with subcritical blade profile and compares with similar other blower fan to the application of impeller on mesolow scope drum (drawing) blower fan through for many years Development Practice, can save energy 10～50%, and noise descends 5～10 decibels.And the centrifugal back that will have a subcritical blade profile to the impeller application national patent, the patent No. is 90218673.6.After subcritical blade profile centrifugal in the exploitation and popularization process of impeller, the fairly obvious again discovery of the inventor is in middle pressure and mesohigh scope, use centrifugal forward direction impeller on centrifugal drum (drawing) blower fan with subcritical blade profile, prior promotional value is arranged, the same with centrifugal back to impeller with subcritical blade profile, have vast potential for future development.
It is good that the purpose of this utility model provides a kind of aeroperformance, and the centrifugal forward direction of subcritical blade of have high efficiency and low noise, easy processing, long service life, using for mesohigh, middle pressure and the centrifugal boiler drum of mesolow (drawing) blower fan and back are to impeller.
The purpose of this utility model is to realize like this, it mainly by: blade (1), wheel hub (2), shroud (3), hub disk (4) etc. are formed, it is characterized in that: be connected with a plurality of blades (1) between shroud (3) and hub disk (4), wheel hub (2) is affixed with hub disk (4), and blade (1) profile is made up of the quadratic curve of two back-flexings.
Its feature also is: the shape of described blade (1), its vane type line can be one group of family of quadric curve with back-flexing, between the quadratic curve of these two back-flexings, can directly be connected by flex point, also can connect by the straight line transition.
Its feature also is: to the forward direction impeller, the stagger angle β 1A=30 of blade (1)～90 °, exit installation angle β 2A=90～180 °, to the back to impeller, the stagger angle β 1A=10 of blade (1)～70 °, exit installation angle β 2A=20～85 °.
Its feature also is: the blade number of described a plurality of blades (1) can be 6～24.
The utility model compared with prior art, its energy saving, efficient height, low noise, the blower fan that adopts this page or leaf sheet to make, total head internal efficiency can be greater than 85%, than A sound machine noise less than 10db, at least the annual blower fan total power consumption that can be country's saving 1/4, the general similar blower fan of noise ratio hangs down 5-10db, and easy processing, long service life, be the extremely excellent type of performance in the present domestic similar blower fan, for a new field has been opened up in the development of fan design theory again.
Below in conjunction with drawings and Examples the utility model is further specified:
Accompanying drawing 1 is looked the broken section structural representation for the centrifugal back of subcritical blade profile to the master of impeller.
Accompanying drawing 2 is looked schematic representation for the centrifugal back of subcritical blade profile to the left side of impeller.
Accompanying drawing 3 is looked the broken section structural representation for the master of the centrifugal forward direction impeller of subcritical blade profile.
Accompanying drawing 4 is looked schematic representation for the left side of the centrifugal forward direction impeller of subcritical blade profile.
Accompanying drawing 5 is blade (1) the profile curve combination schematic representation of the centrifugal forward and backward impeller of subcritical blade profile.
The direction of arrow is the impeller sense of rotation among Fig. 1 and Fig. 3, and R2 is impeller radius (being provided by designing and calculating), and the back is to stagger angle BIA=90 °～180 ° of impeller, and the number of blade is 6～24.
D0 among Fig. 4 is the impeller inlet diameter, and b1 is the blade entrance width, and b2 is the blade exit width, and t is the impeller width, and these are worth by given R2, total head P, and known parameters such as flow Q and rotating speed calculate.
Among Fig. 5:
A is a positive and negative garden camber line combination blade profile, r1=(0.6～3.0) R wherein, and r=(0.08～0.75) R,
B is positive garden camber line-straight line-anti-garden camber line combination blade profile, b=(0～0.2) R wherein,
C is positive and negative parabola combination blade profile, and positive parabolic curvature N1 determines that with reference to NACA aerofoil profile (4209～4721) upper surface anti-parabolic curvature N is definite with reference to NACA aerofoil profile (6206～6721) upper surface,
D is positive parabola-straight line-anti-parabola combination blade profile,
E is positive garden camber line, anti-parabola combination blade profile,
F is positive garden camber line-straight line-anti-parabola combination blade profile,
G is positive parabola, anti-garden camber line combination blade profile,
H is positive parabola-straight line-anti-garden camber line combination blade profile,
Processing of leaves can be used the die stamping moulding.
Among the figure: 1, blade, 2, wheel hub, 3, shroud, 4, hub disk.
Referring to accompanying drawing, the utility model it mainly by blade (1), wheel hub (2), shroud (3), hub disk compositions such as (4), it is characterized in that: be connected with a plurality of blades (1) between shroud (3) and hub disk (4), wheel hub (2) is affixed with hub disk (4), the blade number of described a plurality of blade (1) can be 6～24, blade (1) profile is made up of the quadratic curve of two back-flexings, the shape of described blade (1), its vane type line can be one group of family of quadric curve with back-flexing, between the quadratic curve of these two back-flexings, can directly connect by flex point, also can connect by the straight line transition.
The stagger angle β 1A=30 of forward direction impeller～90 °, exit installation angle β 2A=90～180 °, the back is to the stagger angle β of impeller 1A=10～70 °, exit installation angle β 2A=20～85 °.
Because impeller is the heart of blower fan, and runner and blade shape are the keys that influences impeller and blower fan aeroperformance in the impeller.The gas of supposing to enter impeller channel is desirable air-flow, thereby can be at the differential equation of setting up on the basis of no viscosity flow between gas motion and the blade profile.Because gas has viscosity, air-flow can produce separation in runner intra vane lee face somewhere, and after separation point (pressure gradient is zero), air-flow leaves blade surface and forms vortex, and this is the one of the main reasons that causes blower fan poor efficiency, strong noise.Air-flow still can be flow through at blade lee face attaching surface later at separation point, then must change the later blade profile of separation point, it is overlapped with streamline.Simultaneously, as induced draught fan, in order to reduce to contain friction, etch and the adhesive attraction of different quality particulate to blade surface in the gas, particle preferably is cut in blade surface and flows out, and then also should add the phase tangent condition in the equation.The shape of a blade will satisfy this two conditions simultaneously, must coordinate blade profile with an equation of comptability.This has just formed a blade profile of being made up of the quadratic curve of two back-flexings, change different fan design conditions, vane type line can be one group of family of quadric curve with back-flexing, between the quadratic curve of these two back-flexing lines, can directly connect, also can connect by the straight line transition by flex point.According to the aerodynamic characteristic of this blade profile, the utility model is with the subcritical blade profile of it called after.
Development and application owing to the power economized boiler in modern age, require the pressure head of induced draught fan more and more higher, and the birth and the application of subcritical blade profile forward direction impeller, to become the best adapted blower fan of this energy-saving efficient boiler, it with subcritical blade profile after the same to fan impeller, in middle pressure and mesohigh scope, have high efficiency and low noise two big outstanding advantages equally.
With the 7-37N08A blower fan with subcritical blade profile forward direction impeller is example, and its total pressure efficiency is compared with similar other forward direction fan impeller up to 89%, and efficient exceeds 20-30%, and corresponding A sound level noise has only 83 decibels.Compare with similar other forward direction fan impeller, low about 10 decibels, be better than other similar blower fan significantly.The appearance that has subcritical forward direction fan impeller simultaneously at the fan design theoretical side, has been broken some theorem and axiom on the present institution of higher learning blower fan specialized textbook, for the development of fan design theory, has opened up frontier.For example, think on the textbook that the efficient of forward direction fan impeller is lower to the efficient of fan impeller than the back, and it is high that noise is wanted, these two kinds of theories are broken by the test result of 7-37NO8A blower fan, this proves that further having subcritical blade profile forward direction impeller drum (drawing) blower fan has satisfied energy-conservation and environmental protection two aspect requirements, and has opened up another vast potential for future development for it.
Claims (4)
1, a kind of centrifugal forward and backward impeller with subcritical blade profile, it mainly by: blade (1), wheel hub (2), shroud (3), hub disk (4) etc. are formed, it is characterized in that: be connected with a plurality of blades (1) between shroud (3) and hub disk (4), wheel hub (2) is affixed with hub disk (4), and blade (1) profile is made up of the quadratic curve of two back-flexings.
2, the centrifugal forward and backward impeller with subcritical blade profile according to claim 1, its feature also is: the shape of described blade (1), its vane type line can be one group of family of quadric curve with back-flexing, between the quadratic curve of these two back-flexings, can directly connect by flex point, also can connect by the straight line transition.
3, the centrifugal forward and backward impeller with subcritical blade profile according to claim 1, its feature also is: to the forward direction impeller, the stagger angle β 1A=30 of blade (1)～90 °, exit installation angle β 2A=90～180 °, to the back to impeller, the stagger angle β 1A=10 of blade (1)～70 °, exit installation angle β 2A=20～85 °.
4, the centrifugal forward and backward impeller with subcritical blade profile according to claim 1, its feature also is: the blade number of described a plurality of blades (1) can be 6～24.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97225687 CN2310889Y (en) | 1997-09-05 | 1997-09-05 | Centrifugal forward and rearward impeller with subcritical leaf |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97225687 CN2310889Y (en) | 1997-09-05 | 1997-09-05 | Centrifugal forward and rearward impeller with subcritical leaf |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2310889Y true CN2310889Y (en) | 1999-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97225687 Expired - Fee Related CN2310889Y (en) | 1997-09-05 | 1997-09-05 | Centrifugal forward and rearward impeller with subcritical leaf |
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| Country | Link |
|---|---|
| CN (1) | CN2310889Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460688C (en) * | 2005-08-23 | 2009-02-11 | 海尔集团公司 | Eccentric fan for indoor cabinet air conditioner |
| CN109139547A (en) * | 2018-09-19 | 2019-01-04 | 珠海格力电器股份有限公司 | Multiblade centrifugation blade, centrifugal blower and air conditioner |
-
1997
- 1997-09-05 CN CN 97225687 patent/CN2310889Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460688C (en) * | 2005-08-23 | 2009-02-11 | 海尔集团公司 | Eccentric fan for indoor cabinet air conditioner |
| CN109139547A (en) * | 2018-09-19 | 2019-01-04 | 珠海格力电器股份有限公司 | Multiblade centrifugation blade, centrifugal blower and air conditioner |
| CN109139547B (en) * | 2018-09-19 | 2024-04-26 | 珠海格力电器股份有限公司 | Multi-blade centrifugal fan blade, centrifugal fan and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |