CN201963595U - Centrifugal front or rear impeller of non-separated flow subcritical blade profile - Google Patents
Centrifugal front or rear impeller of non-separated flow subcritical blade profile Download PDFInfo
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- CN201963595U CN201963595U CN2011200020539U CN201120002053U CN201963595U CN 201963595 U CN201963595 U CN 201963595U CN 2011200020539 U CN2011200020539 U CN 2011200020539U CN 201120002053 U CN201120002053 U CN 201120002053U CN 201963595 U CN201963595 U CN 201963595U
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Abstract
The utility model relates to a centrifugal front or rear impeller of a non-separated flow subcritical blade profile. The impeller mainly consists of blades (1), a hub (2), a front disc (3) and a rear disc (4), wherein a plurality of blades (1) are fixedly connected between the front disc (3) and the rear disc (4); the hub (2) is fixedly connected with the rear disc (4); a rectifying cylinder (5) is connected with the front disc (3); a guide groove (6) is formed at the extended part of the front disc (3) and the rear disc (4); and the profile of the blade (1) consists of two reverse bent quadratic curves. Compared with the prior art, the impeller is processed easily and has long service life, higher efficiency and lower noise, the full-pressure internal efficiency can be more than 85 percent, and the noise of the impeller is 5 to 10 decibels lower than that of a common similar fan.
Description
Technical field
The utility model relates to a kind of centrifugal forward and backward impeller that does not have the subcritical blade profile of separated flow, a kind of specifically be used on mesohigh, pressure and mesolow scope centrifugal blower, the induced draught fan centrifugal forward direction and the back to impeller, and when blower, induced draught fan work, can not produce whirlpool in impeller inside and separate, belong to draught fan impeller.
Background technique
Forward direction in the industry at present in usefulness mesohigh, middle pressure and mesolow centrifugal blower, the induced draught fan and back are to impeller, and its blade section shape mostly is straight blade, curved blade, circular arc-straight plate combined blade and aircraft wing type blade etc.Except that above-mentioned various blades, better blade profile of performance and impeller do not appear in the newspapers so far.Put into practice verified; the blade that has straight-plate-type; the centrifugal forward direction of circular arc type blade and the two combination type vane and back are to impeller; be applied to industrial mesohigh; in the time of on middle pressure and the middle low-pressure boiler drum/induced draught fan; because their aeroperformances own are poor; the efficient of blower fan is greatly reduced; average efficiency is generally 50～60%, and as Y5-48 series induced draught fan, and noise is very big; general A upgrading noise LA is greater than 90 decibels; the impeller that has aircraft wing type blade, though its aeroperformance is better, efficient is higher; but noise is also higher; its processing difficulties of while, the cost height, blade is easily punctured by the particulate in the flue gas during use; therefore lose dynamic balancing and scrap, working life is short.
For this reason, the inventor is through for many years Development Practice, work out a kind of centrifugal forward and backward impeller with subcritical blade profile, and applied for patent, the patent No. is 90218673.6 and 97225678.3, the application of this product on mesohigh, middle pressure, mesolow scope boiler blower, induced draught fan compared with similar blower fan, can save energy more than 30%, and noise descends 5～10 decibels.Good social and economic benefit have been produced.
Current, energy-saving and emission-reduction are as the fundamental state policy of China's economic transition, for better improving fan efficiency, reduce noise, the inventor is on the basis of former invention, product is improved, such as adding a rectification tube (5) on the inlet face of subcritical blade profile, on impeller flow outlet circumference, add a guiding gutter (6), the turnover bicker β 1A and the β 2A of blade (1) being adjusted.So just can guarantee the inner nothing separation of impeller vortex arising, thereby can further improve the efficient of blower fan and reduce noise.
Summary of the invention
The purpose of this utility model is to provide the centrifugal forward and backward impeller of the subcritical blade profile of no separated flow that a kind of startability is better, efficient is high and noise is lower uses for mesohigh, middle pressure and mesolow centrifugal blower, induced draught fan, to overcome the deficiencies in the prior art.
The purpose of this utility model is to realize like this, it mainly is made up of blade (1), wheel hub (2), shroud (3), hub disk (4), wherein: be connected with a plurality of blades (1) between shroud (3) and hub disk (4), wheel hub (2) is affixed with hub disk (4), rectification tube (5) joins with shroud (3), guiding gutter (6) is located at the extension of shroud (3) and hub disk (4), and the profile of blade (1) is made up of the quadratic curve of two back-flexings.
Wherein: 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 a transition straight line.
Wherein: quadratic curve can and be pressed the second degree trinomial expression of Taylor series expansion for circular arc, parabola, hyperbola.
Wherein: to the forward direction impeller, 1A=40 °-90 ° of the stagger angle β of blade (1), 2A=90 °-180 ° of exit installation angle β, to the back to impeller, 1A=20 °-70 ° of the stagger angle β of blade (1), 2A=30 °-85 ° of exit installation angle β.
Its feature also is: the blade number of described a plurality of blades (1) can be the 6-18 sheet.
The utility model compared with prior art, easy processing, long service life, efficient height, noise are low, the total head internal efficiency can be greater than 85%, low 5～10 decibels of the general similar blower fan of noise ratio, if can extensively promote, can save electric weight more than 30% for country every year in the sector, can reduce the carbon dioxide discharge capacity in a large number.
Description of drawings
Accompanying drawing 1 is afterwards faced the broken section structural representation to impeller for the subcritical blade profile of no separated flow is centrifugal.
Accompanying drawing 3 is faced the broken section structural representation for the centrifugal forward direction impeller of the subcritical blade profile of no separated flow.
Accompanying drawing 5 is the blade profile curve combination schematic representation of the centrifugal forward and backward impeller of the subcritical blade profile of no separated flow.
Embodiment
The direction of arrow in accompanying drawing 1 and the accompanying drawing 3 is the impeller sense of rotation, and R2 is an impeller radius, is provided by calculating.
D0 in the accompanying drawing 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 Δ X represents the height of rectification tube (5), and Δ R represents the height of guiding gutter (6).These are worth by given R2, total head P, and known parameters such as flow Q and rotation speed n are calculated.
Forward direction in the accompanying drawing 5 and backward inclined blade, make up by just recurvate quadratic curve and to form, these quadratic curves can be circular arc line, parabola, hyperbola and by second degree trinomial expression of Taylor series expansion etc., concrete which two kinds of quadratic curve that use make into blade shape up, can determine according to initial conditions and performance requirement, in case blade profile design moulding, its processing just needs with model and die stamping moulding.
Below in conjunction with drawings and Examples the utility model is further specified:
Referring to accompanying drawing, the purpose of this utility model is to realize like this, it is mainly by blade 1, wheel hub 2, shroud 3, hub disk 4 is formed, wherein: 4 of shroud 3 and hub disks are connected with a plurality of blades 1, wheel hub 2 is affixed with hub disk 4, rectification tube 5 joins with shroud 3, guiding gutter 6 is located at the extension of shroud 3 and hub disk 4, the profile of blade 1 is made up of the quadratic curve of two back-flexings, shape for 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, also can connect by a transition straight line by flex point, for the quadratic curve of blade 1, can be circular arc, parabola, hyperbola reaches the second degree trinomial expression by Taylor series expansion.
Wherein: to the forward direction impeller, 1A=40 °-90 ° of the stagger angle β of blade 1,2A=90 °-180 ° of exit installation angle β, to the back to impeller, 1A=20 °-70 ° of the stagger angle β of blade 1,2A=30 °-85 ° of exit installation angle β, the blade number of blade 1 can be the 6-18 sheet.
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 perfect gas, thereby can set up the differential equation between gas motion and the blade profile on the basis of no viscosity flow.Because gas has viscosity, air-flow is in runner, and blade lee face somewhere can produce separation, and after separation point (pressure gradient is 0 point), air-flow leaves blade surface and forms whirlpool, and this is the main cause that causes blower fan poor efficiency, strong noise.Make air-flow still can be attached to the surface flow mistake later on, then must change the later blade profile of separation point, it is overlapped with the streamline of air-flow at the blade lee face at separation point.
Simultaneously, as induced draught fan, contain friction, erosion and the adhesive attraction of different quality particulate to blade surface in the gas in order to reduce, these particulates preferably are cut in blade surface and flow 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 the profile of blade 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, blade profile can be one group of family of quadric curve with back-flexing, between the quadratic curve of these two back-flexings, can directly connect, also can connect by the straight line transition by flex point.According to the aerodynamic characteristic of this blade profile, in the patent (90218673.6 and 97225678.3) of preceding two model utilitys, all with the subcritical blade profile of its called after.
Afterwards, the use experience of more than ten years proves, because the complexity of blower fan internal flow, method with above-mentioned Mathematical treatment, the pressure gradient of being obtained is zero transition point, it is the starting point of airflow breakaway, in some cases, not necessarily can fit like a glove between its calculated value and the actual value, a segment distance may occur, the flex point of blade profile just can not overlap with the actual airflow separation point, and this must cause the reduction of subcritical blade profile fan performance, be that efficient can descend to some extent, noise also can increase.Can coincide with the separation point of reality for the flex point that makes blade profile, guarantee that fan performance can not descend, this model utility increases a rectification tube 5 at subcritical impeller inlet; Increase a guiding gutter 6 at subcritical impeller outlet; The entry shape of blade 1 and the area of increase inlet blade 1 have been changed; Make the inner and contacted all surface of air-flow of impeller, change over more smooth surface from original rough; The turnover bicker β 1A of blade 1 and β 2A and blade number are done some variation.These improvement can guarantee effectively that impeller inside can not produce whirlpool and separate, and have increased the useful work of blade inlet, have further improved fan efficiency and have reduced noise.
Claims (2)
1. centrifugal forward and backward impeller that does not have the subcritical blade profile of separated flow, it mainly is made up of blade (1), wheel hub (2), shroud (3), hub disk (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), rectification tube (5) joins with shroud (3), guiding gutter (6) is located at the extension of shroud (3) and hub disk (4), and the profile of blade (1) is made up of the quadratic curve of two back-flexings.
2. a kind of centrifugal forward and backward impeller that does not have the subcritical blade profile of separated flow according to claim 1 is characterized in that: two reverse quadratic curves forming blade (1) profile can and be pressed the second degree trinomial expression of Taylor series expansion for circular arc, parabola, hyperbola.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200020539U CN201963595U (en) | 2011-01-06 | 2011-01-06 | Centrifugal front or rear impeller of non-separated flow subcritical blade profile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200020539U CN201963595U (en) | 2011-01-06 | 2011-01-06 | Centrifugal front or rear impeller of non-separated flow subcritical blade profile |
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| Publication Number | Publication Date |
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| CN201963595U true CN201963595U (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200020539U Expired - Fee Related CN201963595U (en) | 2011-01-06 | 2011-01-06 | Centrifugal front or rear impeller of non-separated flow subcritical blade profile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194804A (en) * | 2016-08-31 | 2016-12-07 | 青岛海尔股份有限公司 | Centrifugal blower |
| CN107989812A (en) * | 2017-12-14 | 2018-05-04 | 株洲联诚集团控股股份有限公司 | A kind of heavy duty detergent axial-centrifugal fan |
| CN110762050A (en) * | 2019-12-18 | 2020-02-07 | 浙江兴益风机电器有限公司 | Centrifugal fan impeller |
-
2011
- 2011-01-06 CN CN2011200020539U patent/CN201963595U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194804A (en) * | 2016-08-31 | 2016-12-07 | 青岛海尔股份有限公司 | Centrifugal blower |
| CN106194804B (en) * | 2016-08-31 | 2022-03-25 | 海尔智家股份有限公司 | Centrifugal fan |
| CN107989812A (en) * | 2017-12-14 | 2018-05-04 | 株洲联诚集团控股股份有限公司 | A kind of heavy duty detergent axial-centrifugal fan |
| CN110762050A (en) * | 2019-12-18 | 2020-02-07 | 浙江兴益风机电器有限公司 | Centrifugal fan impeller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20190106 |