CN2230370Y - Stall-proof device for axial-flow fan - Google Patents
Stall-proof device for axial-flow fan Download PDFInfo
- Publication number
- CN2230370Y CN2230370Y CN 94245771 CN94245771U CN2230370Y CN 2230370 Y CN2230370 Y CN 2230370Y CN 94245771 CN94245771 CN 94245771 CN 94245771 U CN94245771 U CN 94245771U CN 2230370 Y CN2230370 Y CN 2230370Y
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- China
- Prior art keywords
- axial
- flange
- inner core
- stall
- flow
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- Expired - Fee Related
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Abstract
The utility model relates to a stall-proof device for axial-flow fans, which is composed of an inlet flange, an inlet cone, an outer shell, guide blades, an inner barrel, an outlet flange and a midsplit flange, wherein, the inlet flange and the outlet flange are respectively welded with the outer shell; the inlet cone is welded on the inlet flange; the guide blades are circular arc shape blades with equal thickness and are welded on the outer shell and the inner barrel. The utility model has small external dimensions and short axial dimension. The utility model can reduce the stall region of an axial-flow fan, and can be suitable for various kinds of axial-flow fans of various dimensions.
Description
The utility model belongs to the fluid machinery technical field, particularly the anti-stall device of axial-flow blower.
The Chinese scholars door has carried out a large amount of research and experimentation work for the rotating stall of eliminating axial-flow blower for many years, has proposed some ways and has attempted the stall zone of axial-flow blower is reduced greatly, up to full elimination.But these ways or act on limitedly, or complex structure, or will increase the physical dimension of axial-flow blower significantly fails to obtain extensive use.Proposing with air diverter up to former Soviet Union C.K.UBAHOB in 1974 is the hump of eliminating on the axial-flow blower characteristic curve, and obtains extensive use on the mine portable blower, has obtained the patent of states such as American and Britain, method, West Germany, India, Denmark.China Chengdu Power Machinery Works has also introduced this technology in 1986 when West Germany KKK company introduces AN profile shaft flow fan proprietary technology, but is referred to as stable performance device KSE.Installing air diverter or KSE on axial-flow blower additional all need make the axial length of axial-flow blower increase more.Because of they are inserted between axial flow fan vane wheel import slip ring and the impeller.This technology is in also not extensive use of China.Often still adopt the conventional approach that between the axial-flow blower inlet/outlet, installs the bypass air channel additional to solve this problem.As Guangzhou Zhujiang Power Plant, Changshu, Jiangsu power plant etc.The air quantity that needs when pipe network system reduces axial-flow blower may stall take place the time, opens bypass air channel valve, and blower fan is exported an air quantity loopback part to fans entrance, with the air quantity of egr mode reinforcement by the blower fan body, avoids the stall zone operation.This device is complicated operation on the one hand, causes a large amount of wastes of energy on the other hand.
The purpose of this utility model is under the prerequisite that does not increase the axial-flow blower axial dimension that designs routinely, in blower fan body structure meter, design a kind of anti-stall device, the stall zone of blower fan is dwindled greatly, thereby avoid blower fan that stall in use takes place.
The utility model is made up of suction flange, cone, shell, stator, inner core, outlet(discharge) flange and middle minute flange.Suction flange and outlet(discharge) flange weld with shell respectively, and cone is welded on the suction flange, and stator is the circular arc straightedge vane, and stator is welded on shell and the inner core.This device is for upper and lower horizonally split formula, with in the branch flange upper and lower two-part are linked into an integrated entity.Whole device is linked with the regulator (or inlet box) and the rotor case of axial-flow blower respectively by suction flange and outlet(discharge) flange.
When axial flow fan vane wheel blade surface generation boundary layer separation is blocked runner, the rough air that the impeller blade inlet pressure has raise will enter the annular pass that is formed by this crust of the device and inner core, and under the stator effect in the annular pass, eliminate rotation, glitch-free again drawing back in the preceding main air flow of impeller, thereby prevent the stall expansion, reach the purpose of dwindling axial-flow blower stall zone greatly.
The utility model is compared with existing air diverter or KSE, and its boundary dimension is little, and particularly axial dimension is short, and shouldn't come the preceding air-flow of equal leaf-unifying wheel by slip ring, thereby can not increase the axial-flow blower axial dimension of design routinely.Our experiments show that, the axial-flow blower of the utility model device is housed, generally can not fall into its stall area operation again, enlarged the using scope and the application of axial-flow blower greatly.The utility model can carry out similar Design according to the external diameter of axial-flow blower and the size of impeller blade top chord length, thereby applicable to the various axial-flow blowers of various sizes, and particularly high, middle last item flow fan is as the sending of station boiler, induced draught fan.Because its boundary dimension is little, need increase the axial dimension that has designed blower fan and change the rotor bearing position, thereby also be applicable to the axial-flow blower that has put into operation again.
The utility model will be further described below in conjunction with accompanying drawing:
Fig. 1 colludes schematic representation for the utility model knot.
Fig. 2 is embodiment's schematic representation of the present utility model.
Fig. 3 is that the utility model and blower fan link schematic representation.
As shown in Figure 1, the utility model is made up of suction flange 1, cone 2, shell 3, stator 4, inner core 5, outlet(discharge) flange 6 and middle minute flange 7.Suction flange and outlet(discharge) flange weld with shell respectively, and cone is welded on the suction flange, and stator is the circular arc straightedge vane, and its entrance point and outlet end are rounding, and stator is welded on shell and the inner core.This device is horizonally split formula up and down, with in divide flange will about two-part connect to one.
As shown in Figure 2, this crust of the device internal diameter is 3350mm, and cone internal diameter and inner core internal diameter are 3000mm, and cone internal diameter and inner core internal diameter are 3000mm.Cone and suction flange are welded into 45 ℃ of angles, the cone height is 105mm, cone and inner core spacing are 180mm, get back to the passage of main air flow before the impeller as stall backspace air-flow, the inner core axial length is 280mm, the bending radius of stator center line is 367mm, chord length is 281mm, its setting angle (string of a musical instrument and circumferencial direction angle) be 67 ° 30 ', the guide vane number is 39, and inner core and outlet(discharge) flange are at a distance of 245mm, and two halves are fused by 5 bolts of middle minute flange up and down, the axial overall width of this device is 810mm, and the external diameter of suction flange and outlet(discharge) flange is 3620mm.
The key dimension of this device be according to joining axial flow fans rotor outer diameter D determine, the concrete visual blower fan structure situation of size is chosen in following scope: internal diameter of outer cover is (1.1～1.2) D, cone and suction flange angle are 30 °～60 °, the cone height is (0.034～0.1) D, cone and inner core spacing are huge to be (0.06～0.1) D, the inner core axial length is (0.09～0.15) D, inner core and fan rotor blade tip are at a distance of 0.015D, but minimum Bu Rong must be lower than 20mm, and inner core is identical with the fan rotor internal diameter of outer cover with the cone internal diameter.The cascade solidity 1.0～1.1 at stator average height place.Stator center line bent angle should be not more than 45 °, and inner core of this device and outlet(discharge) flange spacing are join axial flow fans rotor blade apical axis 0.35 times to 0.42 times to width.
As shown in Figure 3, this device is loaded on axial-flow blower regulator 8 (if blower fan has not designed regulator, then be loaded on blower fan inlet box 10) and fan rotor shell 9 between, suction flange of this device and outlet(discharge) flange link with the outlet(discharge) flange (or outlet(discharge) flange of inlet box 10) of Fan Regulation device 8 and the suction flange of fan rotor shell 9 respectively, the bending direction of stator 4 should be opposite with the bending direction of fan rotor blade 11 in this device, and the import on its inner core and fan rotor blade and blade top is at a distance of 45mm.The cone of this device is all identical with the rotor case internal diameter with the inner core internal diameter.
Claims (6)
1. axial-flow blower anti-stall device, form by suction flange, outlet(discharge) flange, shell, inner core, stator, suction flange and outlet(discharge) flange weld with shell respectively, stator is welded on shell and the inner core, it is characterized in that: on suction flange, also weld a cone, stator is the circular arc straightedge vane, and this device is for upper and lower horizonally split formula, with in the branch flange upper and lower two-part are linked into an integrated entity.
2. axial-flow blower anti-stall device as claimed in claim 1 is characterized in that: internal diameter of outer cover is join 1.1～1.2 times of axial flow fans rotor external diameter.
3. axial-flow blower anti-stall device as claimed in claim 1 is characterized in that: cone and inner core spacing are join 0.06～0.1 times of axial flow fans rotor external diameter.
4. axial-flow blower anti-stall device as claimed in claim 1 is characterized in that: the inner core axial length is join 0.09～0.15 of axial flow fans rotor external diameter.
5. axial-flow blower anti-stall device as claimed in claim 1 is characterized in that: inner core and fan rotor blade tip be at a distance of being join 0.015 times of axial flow fans rotor external diameter, but minimumly must not be lower than 20mm.
6. axial-flow blower anti-stall device as claimed in claim 1 is characterized in that: inner core and outlet(discharge) flange spacing are join axial flow fans rotor blade and blade apical axis 0.35～0.42 times to width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94245771 CN2230370Y (en) | 1994-11-23 | 1994-11-23 | Stall-proof device for axial-flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94245771 CN2230370Y (en) | 1994-11-23 | 1994-11-23 | Stall-proof device for axial-flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2230370Y true CN2230370Y (en) | 1996-07-03 |
Family
ID=33851468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94245771 Expired - Fee Related CN2230370Y (en) | 1994-11-23 | 1994-11-23 | Stall-proof device for axial-flow fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2230370Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047157A (en) * | 2012-12-18 | 2013-04-17 | 平安电气股份有限公司 | Motor side external speed regulating type axial flow fan |
| CN106151112A (en) * | 2016-08-29 | 2016-11-23 | 中国能源建设集团广东省电力设计研究院有限公司 | The anti-stall device of axial flow blower and control method thereof |
-
1994
- 1994-11-23 CN CN 94245771 patent/CN2230370Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047157A (en) * | 2012-12-18 | 2013-04-17 | 平安电气股份有限公司 | Motor side external speed regulating type axial flow fan |
| CN103047157B (en) * | 2012-12-18 | 2015-12-23 | 平安电气股份有限公司 | Motor side external formula regulable speed type propeller fan |
| CN106151112A (en) * | 2016-08-29 | 2016-11-23 | 中国能源建设集团广东省电力设计研究院有限公司 | The anti-stall device of axial flow blower and control method thereof |
| CN106151112B (en) * | 2016-08-29 | 2020-02-18 | 中国能源建设集团广东省电力设计研究院有限公司 | Anti-stall device of axial flow fan and control method thereof |
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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 |