CN201963612U - Anti-surge device of axial flow fan - Google Patents
Anti-surge device of axial flow fan Download PDFInfo
- Publication number
- CN201963612U CN201963612U CN201120029652XU CN201120029652U CN201963612U CN 201963612 U CN201963612 U CN 201963612U CN 201120029652X U CN201120029652X U CN 201120029652XU CN 201120029652 U CN201120029652 U CN 201120029652U CN 201963612 U CN201963612 U CN 201963612U
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- shell
- flow fan
- surge device
- surge
- axial flow
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Abstract
The utility model discloses an anti-surge device of an axial flow fan. The existing large-scale axial flow fan is surged due to the overlarge instantaneous resistance under the conditions that a ventilation pipe network and a silencer are blocked, a subway train runs windward and backward, or the fans which are arranged with one another in parallel independently run and the like, thus leading to the severe vibration of the whole ventilating system, and even damage the flow fan. The utility model provides the anti-surge device of the axial flow fan, which comprises a shell, an inner ring, a plurality of guide blades which are arranged between the shell and the inner ring, and a flow guider which is arranged at one end of the shell and integrally connected with the shell. The anti-surge device is characterized in that the installing arc length inclined angle alpha of the guide blades are from 50 degrees to 70 degrees. After the anti-surge device is used, the fan can not be surged under the abnormal working condition or under the emergency state, and the safe running of the ventilation system is guaranteed.
Description
Technical field
The utility model relates to ventilation equipment, specifically a kind of axial fan anti-surge installation.
Background technique
The existing medium-and-large-sized axial fans of engineering such as subway, tunnel, power station, airdrome that are applied to, because of ventilation pipe network and silencing apparatus obstruction, or the subway train reverse driving that facings the wind, or situation such as the blower fan separate unit operation that is installed in parallel and cause moment resistance excessive, cause blower fan generation surge, cause the high vibration of whole ventilation system, even damage blower fan.
The model utility content
The purpose of this utility model provides a kind of blower fan that can effectively prevent at the axial fan anti-surge installation that departs from stall generation surging phenomenon under the nominal situation or the state of emergency, the safe operation of assurance ventilation system.
For this reason, the technical solution adopted in the utility model is: a kind of axial fan anti-surge installation, the directed flow device that comprises shell, inner ring, places equally distributed guide vane between shell and the inner ring, places shell one end and be connected as a single entity with it is characterized in that it is 50-70 ° that described guide vane is installed arc length angle α.
Described guide vane arc length angle α is 50-70 °, and the guide vane number is 35～131.
Described anti-surge installation is installed in and can reverses on (forward or reverse) axial fan, and the position of the anti-surge installation that just changes, reverses is installed in the both sides of axial fan impeller respectively.
Reasonable in design of the present utility model, be installed on the axial fan, can make blower fan depart under the nominal situation condition or under the state of emergency, as stopping up because of ventilation pipe network and silencing apparatus, or the subway train reverse driving that facings the wind, or surge does not take place under the situations such as blower fan separate unit operation that are installed in parallel, and avoided causing the damage of miscellaneous equipments such as blower fan owing to surge causes strong mechanical vibration, guaranteed the safe operation of ventilation system.The utility model can be widely used on the medium-and-large-sized axial fans of engineering such as subway, tunnel, power station, airdrome, is particularly useful on the axial fan that the blower fan diameter is 1000～4000mm.
The utility model is described in further detail below in conjunction with specification drawings and specific embodiments.
Description of drawings
Fig. 1 is the novel half sectional view of this reality.
Fig. 2 is the enlarged view at I place among Fig. 1.
Fig. 3 is a B-B partial sectional view among Fig. 2.
Fig. 4 can reverse the schematic representation on (forward or reverse) blower fan for the utility model is installed in.
Fig. 5 for blower fan when not adding anti-surge installation, the performance chart of fan operation, wherein, Q represents that flow, P represent pressure, a, b, c, d, e, f represent running operating point.
Fig. 6 is for having the schematic representation that blower fan causes surge now, and wherein A, B are the vortex.
Fig. 7 is a blower fan after intake grill is installed anti-surge installation, the performance chart of fan operation, and wherein Q represents flow, P represents pressure.
Embodiment
Shown in Fig. 1-4, the utility model by shell 3, inner ring 2, place between shell and the inner ring equally distributed guide vane 1 and place shell one end directed flow device 4 to constitute, the directed flow device is cylindrical body and is connected as a single entity with shell, guide vane arc length angle α is 50-70 °, guide vane number is set is 35～131, can select the number of blade according to the blower fan diameter.During use, the utility model is installed between the casing blower fan 6 and impeller 5 of draught fan impeller one end, fan airflow through behind the anti-surge installation, enters impeller earlier again.
The technical Analysis that the ventilation system surge produces: when axial fan when increasing resistance suddenly, be that blower fan is when moving in the unstable period district, the operating point blower pressure is in rising trend, its performance curve is (curve △ P/ △ Q operating mode is unstable state) as shown in Figure 5, its high velocity air is during by blower fan and impeller section, and it is very serious to reflux, and the moving high velocity air of concurrent-countercurrent produces serious eddy current, cause the violent surge of draught fan impeller, even damage blower fan.Its running state is gone round and begun again by a, b, c, d, e, f and is carried out during blower fan generation surge, and the operation conditions of whole ventilation system can't reach the design conditions point; Air inlet status analysis from blade, as shown in Figure 6, when axial fan departs from applying working condition, resistance constantly increases, flow constantly reduces, the air-flow of impeller inside is when the minimum operation state, and eddy current B point constantly enlarges, simultaneously, form new eddy current A at import blade tip place, the eddy current that its blade root place forms develops into blade tip A place, and the vortex constantly enlarges, and the pressure of blower fan and flow timing occurs when aperiodic and bear, relevant pressure, flow produce very big fluctuation, the volume of system is big more, and the amplitude of surge is big more, vibrates that also Shaoxing opera is strong.When blade root, when the blade tip place forms comprehensive eddy current, then stop up air-flow path, force radially deflection of main air flow court, have a strong impact on the gas flow situation.After anti-surge installation is installed, its performance curve as shown in Figure 7, the eddy current that this moment, the A place produced passes through anti-surge installation, and from the device cavity stator air-flow and main air flow are met, under the drive of main air flow, enter impeller and quicken to form following current, make it eliminate the eddy current that the blade tip place produces, weaken the air-flow blocked state, thereby eliminate the surging phenomenon of blower fan effectively.
Claims (4)
1. axial fan anti-surge installation, the directed flow device (4) that comprises shell (3), inner ring (2), places equally distributed guide vane (1) between shell and the inner ring, places shell one end and be connected as a single entity with it is characterized in that it is 50-70 ° that described guide vane is installed arc length angle α.
2. axial fan anti-surge installation according to claim 1 is characterized in that described directed flow device is cylindrical body.
3. axial fan anti-surge installation according to claim 1 and 2 is characterized in that described guide vane number is the 35-131 sheet.
4. axial fan anti-surge installation according to claim 1 and 2 is characterized in that it is installed in the both sides of axial fan impeller (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120029652XU CN201963612U (en) | 2011-01-27 | 2011-01-27 | Anti-surge device of axial flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120029652XU CN201963612U (en) | 2011-01-27 | 2011-01-27 | Anti-surge device of axial flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201963612U true CN201963612U (en) | 2011-09-07 |
Family
ID=44526147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120029652XU Expired - Fee Related CN201963612U (en) | 2011-01-27 | 2011-01-27 | Anti-surge device of axial flow fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201963612U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104088820A (en) * | 2014-07-17 | 2014-10-08 | 山西省安瑞风机电气有限公司 | Anti-surge ring for axial flow fan |
-
2011
- 2011-01-27 CN CN201120029652XU patent/CN201963612U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104088820A (en) * | 2014-07-17 | 2014-10-08 | 山西省安瑞风机电气有限公司 | Anti-surge ring for axial flow fan |
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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: 20190127 |