CN201368039Y - Efficient anti-surging axial flow fan - Google Patents
Efficient anti-surging axial flow fan Download PDFInfo
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- CN201368039Y CN201368039Y CNU2009200736880U CN200920073688U CN201368039Y CN 201368039 Y CN201368039 Y CN 201368039Y CN U2009200736880 U CNU2009200736880 U CN U2009200736880U CN 200920073688 U CN200920073688 U CN 200920073688U CN 201368039 Y CN201368039 Y CN 201368039Y
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Abstract
The utility model relates to an efficient anti-surging axial flow fan which is characterized in that an efficient anti-surging ring is arranged beside a fan moving blade. The efficient anti-surging ring is ring-shaped and provided with a plurality of small flow-guiding blades and a rectifying ring. The tip of the air feeding side of the blade extends into an annular cavity of the efficient anti-surging ring; considering a unidirectional fan, the efficient anti-surging ring is directly placed on the front side of the air feeding end of the moving blade; and considering a reversible axial flow fan, the efficient anti-surging rings are respectively arranged on the two sides of the moving blade, the small flow-guiding blades in the ring are utilized to stir and break the vortex flow and re-rectifies the broken vortex flow and reduces the impact on the blade by the vortex to the minimum level, thereby greatly enhancing the safety coefficients of fan, expanding the actual running range, eliminating the existence of surging phenomenon, and avoiding the power loss. The utility model provides the novel, efficient and safe anti-surging axial flow fan.
Description
Technical field
The utility model relates to a kind of axial-flow blower structure, particularly a kind of efficient anti-surge axial-flow blower.
Background technique
As everyone knows, because the characteristics of the aeroperformance of axial-flow blower own: during blower fan work, when flow was reduced to a certain degree, pressure descended suddenly, and it is unstable that performance becomes, and working state extremely worsens.At this moment, because pressure can not descend immediately in the pipe network, blower fan can't be discharged gas and " feeling suffocated " phenomenon be occurred, and gas can flow back in the blower fan in the pipe network, up to ductwork pressure and blower pressure isoequilibrium mutually, blower fan is supplied gas to pipe network again, and this moment, flow increased, and it is normal that blower fan work recovers, but when pressure recovery in the pipe network arrives original value, flow is still less than normal flow rate, and blower pressure descends suddenly again, and air-flow can flow back to blower fan again from pipe network.So go round and begin again, air-flow is sent to pipe network a little while, air return machine flows backwards again a little while, strong airflow fluctuation occurs, this phenomenon just is called " surge " (also claiming " stall " and " driving ") of blower fan, and hump type performance curve (Fig. 1) can appear in this moment, curve a is existing axial-flow blower typical case performance curve among the figure, performance curve has hump, and curve A B section is normal operation area, and the BCD section then is a surge area.
Blower fan is forbidden moving in surge area under the normal condition, as China nuclear industry EJ/T 886-2006 " nuclear level ventilator design a general rule " standard to nuclear level axial-flow blower regulation: I operation flow must be no more than 30% of design discharge on the same performance curve, a lot of external nuclear power design criterions (as the ASTM standard) require this value to be no more than 15% of design discharge, and this can't realize for conventional axial-flow blower.Harmfulness after the axial-flow blower surge produces mainly shows as: (1) fan performance severe exacerbation, noise are unusual, cause ventilating, purging system can not normally move; (2) blower fan high vibration, the lost of life even cause the generation of leaf destruction phenomenon.
State inner blower factory is all capturing this phenomenon at present, there is the part blower fan also to use some anti-surge installations, also played certain anti-surge effect, but corresponding pressure and efficient have also reduced, so group effect is undesirable, fail fundamentally to solve the problem that the anti-asthma shake does not influence fan efficiency simultaneously.
Summary of the invention
A kind of efficient anti-surge axial-flow blower of the utility model, its purpose are to provide a kind of performance that can address the above problem the efficient axial-flow blower of anti-surge simultaneously.
A kind of efficient anti-surge axial-flow blower of the utility model, it is provided with efficient anti-surge ring on the blower blade side, efficient anti-surge ring is the device that an annular has some little guide vanes and collector ring, blade air inlet lateral lobe point stretches in the annular chamber of efficient anti-surge ring, described efficient anti-surge ring is for unidirectional blower fan, directly place moving vane inlet end front side, place the both sides of moving vane to be provided with respectively for the reversible axial-flow blower, utilize the interior little guide plate of its ring that swirling air stream is blended and carry out the back by the bad rectification again of rectification, vortex is reduced to minimum to the collapsing force that blade produces, thereby but has strengthened the safety coefficient of blower fan greatly and enlarged the reality range of operation.
A kind of efficient anti-surge axial-flow blower of the utility model has stretched into certain distance in the annular chamber with blade air inlet lateral lobe point, the secondary eddy current can be forced to flow into annulus owing under the centrifugal action before not converging with normal airflow, utilize the little guide vane that suitable quantity and shape are installed in the torus space, intercepted the return air rotation, equably it is cut apart and blend, and then get back to less moving vane air inlet place of radius and become normal airflow and suck, so just can not cause that originally normal air-flow also takes in the ring cavity by the phenomenon of stirring Yu decompose by mistake, thereby general anti-surge installation has reduced the generation of the pressure loss and loss in efficiency phenomenon, guaranteed that blower fan is efficient, safe operation, it has eliminated the existence of surging phenomenon, and the anti-surge installation of more original all the other types has reduced the pressure loss, also having avoided simultaneously the loss of efficient, is a kind of anti-surge axial-flow blower of novel energy-conserving safety type.
Description of drawings
Fig. 1 is original axial-flow blower performance chart.
Fig. 2 is a kind of efficient anti-surge axial-flow blower schematic diagram of the utility model.
Fig. 3 is a kind of efficient anti-surge axial-flow blower one-way shaft flow fan structural drawing of the utility model.
Fig. 4 is the two-way axial-flow blower structural drawing of a kind of efficient anti-surge axial-flow blower of the utility model.
1 is guide vane among the figure, and 2 is that collector ring, 3 is moving vane, and 4 is eddy current.
Embodiment
A kind of efficient anti-surge axial-flow blower, it is provided with efficient anti-surge ring on the blower blade side, efficient anti-surge ring is the device that an annular has some little guide vanes (1) and collector ring (2), moving vane (3) air inlet lateral lobe point stretches in the annular chamber of efficient anti-surge ring, described efficient anti-surge ring is for unidirectional blower fan, directly place moving vane inlet end front side, place the both sides of moving vane to be provided with respectively for the reversible axial-flow blower, utilize the interior little guide plate of its ring that swirling air stream is blended and carry out the back by the bad rectification again of rectification, vortex is reduced to minimum to the collapsing force that blade produces, thereby but has strengthened the safety coefficient of blower fan greatly and enlarged the reality range of operation.
Local eddy currents (secondary back) phenomenon can take place after having entered the surge area operation in a kind of efficient its work of anti-surge axial-flow blower of the utility model, eddy current (secondary back) can become the stall unit of rotation around the viscosity ring vortex of the different length of flow blower casing periphery, efficient anti-surge ring in the utility model utilizes the little guide plate in its ring that these swirling air streams are blended equably, decompose, swirling air stream is reduced to minimum to the front and back alternation pressure reduction stress that blade produces, and the unbalanced force that acts on the blade also will reduce greatly.Simultaneously the air-flow vortex of collector ring after having ended these and blending enters the blade inlet edge end with very big flow inlet angle rapidly, utilize the rectifying effect of certain-length to make air-flow in order, make it to enter the pressure side of moving vane with the state that is similar to the normal airflow tissue, eliminate harm and air turbulence phenomenon that the surge backflow phenomenon produces blade, will make fan performance curve in most of scope of stall zone, keep stable like this, the fan operation curve becomes the b curve by a curve shown in Fig. 1, but become a desirable operation curve, but widened the reality range of operation of blower fan greatly, blade air inlet lateral lobe point has stretched into certain distance in the annular chamber, the secondary eddy current can be forced to flow into annulus owing under the centrifugal action before not converging with normal airflow, utilize the little guide vane that suitable quantity and shape are installed in the torus space, intercepted the return air rotation, equably it is cut apart and blend, and then get back to less moving vane air inlet place of radius and become normal airflow and suck, so just can not cause that originally normal air-flow also takes in the ring cavity by the phenomenon of stirring Yu decompose by mistake, thereby general anti-surge installation has reduced the generation of the pressure loss and loss in efficiency phenomenon, has guaranteed that blower fan is efficient, safe operation.
A kind of efficient anti-surge axial-flow blower of the utility model, eliminated the existence of surging phenomenon, and the anti-surge installation of more original all the other types has reduced the pressure loss, has also avoided the loss of efficient simultaneously, is a kind of anti-surge axial-flow blower of novel energy-conserving safety type.
Claims (3)
1, a kind of efficient anti-surge axial-flow blower is characterized in that: it is provided with efficient anti-surge ring on the blower blade side, and blade air inlet lateral lobe point stretches in the annular chamber of efficient anti-surge ring.
2, a kind of efficient anti-surge axial-flow blower according to claim 1, it is characterized in that: described efficient anti-surge ring is the device that an annular has some little guide vanes and collector ring.
3, a kind of efficient anti-surge axial-flow blower according to claim 1, it is characterized in that: described efficient anti-surge ring is for the one-way shaft flow fan, directly place moving vane inlet end front side, place the both sides of moving vane to be provided with respectively for the reversible axial-flow blower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200736880U CN201368039Y (en) | 2009-03-16 | 2009-03-16 | Efficient anti-surging axial flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200736880U CN201368039Y (en) | 2009-03-16 | 2009-03-16 | Efficient anti-surging axial flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201368039Y true CN201368039Y (en) | 2009-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200736880U Expired - Fee Related CN201368039Y (en) | 2009-03-16 | 2009-03-16 | Efficient anti-surging axial flow fan |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758783A (en) * | 2014-02-17 | 2014-04-30 | 南通大通宝富风机有限公司 | Control rod drive mechanism cooling fan blade capable of reducing root bending stress |
| CN103821773A (en) * | 2014-02-17 | 2014-05-28 | 南通大通宝富风机有限公司 | Control rod drive mechanism cooling fan with diffuser tail cone |
| CN105697421A (en) * | 2016-03-23 | 2016-06-22 | 江苏大学 | Saddle-area-free axial flow fan |
| CN108425889A (en) * | 2018-04-09 | 2018-08-21 | 浙江理工大学上虞工业技术研究院有限公司 | The two level axial flow blower and its anti-asthma method of slight of efficient anti-surging |
| CN111059082A (en) * | 2019-12-27 | 2020-04-24 | 宁波奥克斯电气股份有限公司 | Anti-surge fan and air conditioner |
-
2009
- 2009-03-16 CN CNU2009200736880U patent/CN201368039Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758783A (en) * | 2014-02-17 | 2014-04-30 | 南通大通宝富风机有限公司 | Control rod drive mechanism cooling fan blade capable of reducing root bending stress |
| CN103821773A (en) * | 2014-02-17 | 2014-05-28 | 南通大通宝富风机有限公司 | Control rod drive mechanism cooling fan with diffuser tail cone |
| CN105697421A (en) * | 2016-03-23 | 2016-06-22 | 江苏大学 | Saddle-area-free axial flow fan |
| CN108425889A (en) * | 2018-04-09 | 2018-08-21 | 浙江理工大学上虞工业技术研究院有限公司 | The two level axial flow blower and its anti-asthma method of slight of efficient anti-surging |
| CN111059082A (en) * | 2019-12-27 | 2020-04-24 | 宁波奥克斯电气股份有限公司 | Anti-surge fan and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20100316 |