CN2547925Y - One-way oxial-flor fan with anti-surge structure - Google Patents
One-way oxial-flor fan with anti-surge structure Download PDFInfo
- Publication number
- CN2547925Y CN2547925Y CN 02240668 CN02240668U CN2547925Y CN 2547925 Y CN2547925 Y CN 2547925Y CN 02240668 CN02240668 CN 02240668 CN 02240668 U CN02240668 U CN 02240668U CN 2547925 Y CN2547925 Y CN 2547925Y
- Authority
- CN
- China
- Prior art keywords
- water conservancy
- conservancy diversion
- fan
- impeller
- outer shroud
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a uni-directional axial-flow fan with an antisurging structure, and is characterized in that a casing which is arranged at the front of a vane midline of an impeller is provided with a bypass guide passage which consists of a guide outer ring, a guide inner ring and a plurality of guide vanes arranged between the guide outer ring and the guide inner ring, thereby the airflow blocked on the tip of the impeller can pass through the bypass guide passage and flow into the mianstream direction of the uni-directional axial-flow fan, thereby avoiding the surging phenomenon in case of small flow rate of the fan and extending the operation area of the fan. The utility model can also be applied to the ventilation in the particular working fields about coal, oil, chemical engineering, etc. after being antisepticized and explosion-prevented.
Description
Technical field
The utility model relates to a kind of one-way shaft flow fan of ventilating, taking a breath of being used to, particularly a kind of one-way shaft flow fan that the anti-surge structure is arranged.
Background technique
The present one-way shaft flow fan that uses in ventilation such as subway, highway, railway tunnel and building and air-cooled occasion, when the operating point of blower fan moves on to a certain small flow district in left side of performance curve, flow, pressure by ventilator and pipe network can produce fierce pulsation, air-flow progressively separates and blocks at blade tip, thereby causes the vibration that whole blower fan is violent---surge.Surge makes fan operation extremely unstable, and strong mechanical vibration meeting causes the damage of blower fan.
Summary of the invention
The utility model provides a kind of one-way shaft flow fan that also can stable operation in the small flow district for solving the technical problem that exists in the known technology.
The technological scheme that the utility model is taked for the technical problem that exists in the solution known technology is:
A kind of one-way shaft flow fan that the anti-surge structure is arranged, by casing, be packed in motor sheath in the casing by support, motor in the motor sheath is installed, and the impeller and the cowling that are installed on the motor output shaft are formed, on the casing in impeller the place ahead, be provided with one by the water conservancy diversion outer shroud, ring and several guide vanes constitute in the water conservancy diversion, be used for eliminating the bypass guide channel of air-flow tangential velocity, its several guide vanes are packed in uniform way and form the bypass guide channel in water conservancy diversion outer shroud and the water conservancy diversion between the ring, encircle the not covering district of the place ahead one side of the blade center line that leaves the ring-like water conservancy diversion district of mutual perforation between both sides and water conservancy diversion outer shroud two inboards and be positioned at impeller in its water conservancy diversion.
The utility model can also adopt following technical measures:
The cross section of described water conservancy diversion outer shroud is a grooved.
Advantage and the good effect that the utlity model has are: owing to be provided with the bypass guide channel of being made up of ring and several guide vanes in water conservancy diversion outer shroud, the water conservancy diversion on the casing in impeller the place ahead, when the one-way shaft flow fan is moved in the small flow district, the air communication that is blocked in blade tip is crossed the main flow area that the bypass guide channel flows into the one-way shaft flow fan, eliminated airflow obstruction, thereby avoided the generation of surge when the one-way shaft flow fan is moved in the small flow district, expanded the operation area of one-way shaft flow fan.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the left view of Fig. 1.
Embodiment
For further understanding summary of the invention of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
See also Fig. 1, be fixed with motor sheath 7 by supporting 6 in the casing 5, motor 8 is installed in the motor sheath.The impeller 4 and the cowling 9 of blower fan are installed on the output shaft of the motor of motor sheath front end.Be blocked in the air-flow of the blade tip of impeller when dredging one-way shaft flow fan small flow, on the casing in blade center line 10 the place aheads of impeller, be shaped on a bypass guide channel of forming by ring 3 and several (present embodiment is 24) guide vanes 2 in water conservancy diversion outer shroud 1, the water conservancy diversion, the cross section of its water conservancy diversion outer shroud is a flute profile, forms the ring shaped slot in the casing after installing with casing 1.Be packed in water conservancy diversion outer shroud inboard less than ring 3 in the water conservancy diversion of water conservancy diversion outer shroud by uniform 24 guide vanes 2 that are packed on its circumference with width, in water conservancy diversion outer shroud, water conservancy diversion, between the space of ring and guide vane 24 bypass guide channels 11 are arranged like this, as shown in Figure 2.Therefore form ring-like not covering district I and the water conservancy diversion district II that connects mutually.So that this blower fan provides a bypass guide channel for when small flow the air-flow of the blade tip that is blocked in impeller, eliminate the air-flow tangential velocity and flow into the main flow direction A of this blower fan along this passage, thereby avoided the generation of surge, expanded the operation area of one-way shaft flow fan.The utility model can also be applied to the ventilation in special operation places such as colliery, oil and chemical industry after carrying out anticorrosion and explosion-proof processing.
Claims (2)
1. one-way shaft flow fan that the anti-surge structure is arranged, by casing, be packed in motor sheath in the casing by support, motor in the motor sheath is installed, and the impeller and the cowling that are installed on the motor output shaft are formed, it is characterized in that: on the casing in impeller the place ahead, be provided with one by the water conservancy diversion outer shroud, ring and several guide vanes constitute in the water conservancy diversion, be used for eliminating the bypass guide channel of air-flow tangential velocity, its several guide vanes are packed in uniform way and form the bypass guide channel in water conservancy diversion outer shroud and the water conservancy diversion between the ring, encircle the not covering district of the place ahead one side of the blade center line that leaves the ring-like water conservancy diversion district of mutual perforation between both sides and water conservancy diversion outer shroud two inboards and be positioned at impeller in its water conservancy diversion.
2. the one-way shaft flow fan that the anti-surge structure is arranged according to claim 1, it is characterized in that: the cross section of water conservancy diversion outer shroud is a grooved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02240668 CN2547925Y (en) | 2002-06-25 | 2002-06-25 | One-way oxial-flor fan with anti-surge structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02240668 CN2547925Y (en) | 2002-06-25 | 2002-06-25 | One-way oxial-flor fan with anti-surge structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2547925Y true CN2547925Y (en) | 2003-04-30 |
Family
ID=33713722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02240668 Expired - Fee Related CN2547925Y (en) | 2002-06-25 | 2002-06-25 | One-way oxial-flor fan with anti-surge structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2547925Y (en) |
-
2002
- 2002-06-25 CN CN 02240668 patent/CN2547925Y/en not_active Expired - Fee Related
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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 |