CN201627733U - Centrifugal fan - Google Patents
Centrifugal fan Download PDFInfo
- Publication number
- CN201627733U CN201627733U CN2009202246212U CN200920224621U CN201627733U CN 201627733 U CN201627733 U CN 201627733U CN 2009202246212 U CN2009202246212 U CN 2009202246212U CN 200920224621 U CN200920224621 U CN 200920224621U CN 201627733 U CN201627733 U CN 201627733U
- Authority
- CN
- China
- Prior art keywords
- centrifugal fan
- blade
- vanes
- increased
- design
- 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
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model relates to a centrifugal fan, which comprises a volute casing and a shrouded impeller. The centrifugal fan is characterized in that the shrouded impeller comprises a cover, a disc, vanes and a vane-less rotating diffuser, wherein the vanes are designed according to a variable speed deceleration method, and the whole impeller rotates around the center of a rotating shaft. As profiles of the vanes of the fan are designed according to variable speed deceleration, efficiency of the centrifugal fan is increased obviously compared with the centrifugal fan on the same design working condition. When in design discharge, the total efficiency of the centrifugal fan is increased by 4.7% compared with that of the original 9-19 type centrifugal fan; and when in small flow, the total efficiency of the centrifugal fan is increased by 3.8%. By comparing pressure curves of the centrifugal fan and the original centrifugal fan, the total efficiency is increased by 3.5% at a design discharge point while the total efficiency is increased by 3% when in small flow. The vanes are rearwards vanes so as to be capable of preventing burnout of a motor caused by overload of the centrifugal fan when in high flow.
Description
Technical field
The utility model belongs to field of fluid machinery, specifically a kind of centrifugal blower.
Background technique
Centrifugal fan is the universal machine that is widely used in each industrial system, big, the operation continuously for a long time of energy consumption.Because the Centrifugal Fan Impeller diameter is very big, in order to control cost and to be convenient to processing, general large centrifugal ventilator must adopt two yuan of impellers.
The design method of two yuan of blades of centrifugal blower roughly has following several at present: 1, by given inlet blade angle degree and exit angle, directly adopt how much moulding of circular arc.By the experience design blade, impeller adiabatic efficiency is on the low side fully for this traditional design method.2, the regularity of distribution of relative mean velocity in the given impeller, general adopt wait slow down or etc. the method for expansion angle, or the distribution in direct given mean velocity longshore current road, obtain vane type line by the simple geometric relation, carry out simple blade loading analysis again, above-mentioned design method all needs stronger experience accumulation, and all will determine optimal design proposal through draught fan performance test repeatedly.3, given moment of momentum is similar to the design method of compressor impeller, adopts this design proposal, only loads to center line of flow path.Have the design of impeller now, be difficult to improve the efficient of centrifugal fan.
Summary of the invention
The purpose of this utility model provides a kind of simple and reasonable for structure in order to overcome the deficiency of above-mentioned technology, adopts to become the deceleration design method design vane type line, and the centrifugal blower of the high efficient, high pressure compact structure of easily making.
Technical solution adopted in the utility model is: a kind of centrifugal blower, comprise a spiral case and a double shrouded wheel, it is characterized in that double shrouded wheel comprise wheel cap, wheel disc, with the blade that becomes the retarding method design with do not have leaf rotary diffusing device, the center rotation around the shaft of whole impeller.
Centrifugal blower described in the utility model adopts the exit angle that becomes retarding method design blade to be 70 ° to 90 °.
Centrifugal blower described in the utility model, the diameter of its no leaf rotary diffusing device are 1.03 to 1.1 times of blade diameter.
Centrifugal blower described in the utility model, its spiral case can be conventional spiral cases, also can be other form spiral cases, and the spiral case of a plurality of outlets can be arranged.
Owing to have bigger impact loss easily in blade inlet, in the ducting capacity decline of blade exit place blade, also have bigger loss easily, so adopt less deceleration rate favourable in these two zones; At the blade zone line, blade control flows kinetic force is strong, and air-flow can adopt bigger deceleration and diffusion degree.The utility model is an example with the 9-19 centrifugal blower design parameter of extensive use, adopt controlled change deceleration design method design vane type line, make full use of the strong characteristics of blade zone line control ability, avoid the big loss of blade exit and entrance region, improve the efficient of whole centrifugal blower.
Fan blade molded lines of the present utility model adopts and becomes the retarding method design, the centrifugal blower of same relatively design conditions, and efficient improves significantly, and total pressure efficiency improves 4.7% than former 9-19 centrifugal blower when design discharge; During small flow, total pressure efficiency has improved 3.8%; The reduced pressure curve improves 3.5% in the design point total head, and during small flow, total head improves 3%; Blade adopts backward inclined blade, in the time of can avoiding big flow, and the burn-down of electric motor that the centrifugal blower overload is caused.
Description of drawings
The utility model is described in detail by embodiment below in conjunction with accompanying drawing.
Fig. 1 is the meridian plane structural representation of the utility model centrifugal blower double shrouded wheel.
Fig. 2 is the schematic representation of the turning surface structure of centrifugal blower.
Mark among the figure: 1, wheel cap, 2, wheel disc, 3, the centrifugal impeller blade, 4, the impeller shaft center line, 5, the rotary diffusing device, 6, spiral case.
Embodiment
By Fig. 1, shown in Figure 2: a kind of centrifugal blower, comprise a spiral case 6 and a double shrouded wheel, its double shrouded wheel comprises wheel cap 1, wheel disc 2, with the blade 3 that becomes the retarding method design with there is not leaf rotary diffusing device 5, center 4 rotations around the shaft of whole impeller, adopt the exit angle that becomes retarding method design blade 3 to be 70 ° to 90 °, the diameter of its no leaf rotary diffusing device 5 is 1.03 to 1.1 times of blade 3 diameters, spiral case 6 can be conventional spiral case, also can be other form spiral cases, the spiral case of a plurality of outlets can be arranged as required.
The utility model is selected the 9-19 centrifugal blower design parameter of extensive use, under the prerequisite that keeps former 9-19 fan design parameter and shroud and hub disk size constancy, adopt the molded lines that becomes deceleration design method design blade, blade outlet angle is revised as 70 ° to 90 °, the diameter of no leaf rotary diffusing device is 1.03 to 1.1 times of blade exit diameter, improved centrifugal blower fan blade wheel efficient, the centrifugal blower overall efficiency is improved.
Claims (4)
1. a centrifugal blower comprises a spiral case and a double shrouded wheel, it is characterized in that double shrouded wheel comprise wheel cap, wheel disc, with the blade that becomes the retarding method design with do not have leaf rotary diffusing device, the center rotation around the shaft of whole impeller.
2. centrifugal blower as claimed in claim 1 is characterized in that the wheel cap of impeller and the middle blade of installing of wheel disc are to adopt to become the design of deceleration design method, and its blade outlet angle is 70 ° to 90 °.
3. centrifugal blower as claimed in claim 1, the diameter that it is characterized in that not having leaf rotary diffusing device is 1.03 to 1.1 times of blade exit diameter.
4. centrifugal blower as claimed in claim 1 is characterized in that spiral case can be conventional spiral case, also can be the spiral case that a plurality of outlets are arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202246212U CN201627733U (en) | 2009-08-14 | 2009-08-14 | Centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202246212U CN201627733U (en) | 2009-08-14 | 2009-08-14 | Centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201627733U true CN201627733U (en) | 2010-11-10 |
Family
ID=43059129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202246212U Expired - Fee Related CN201627733U (en) | 2009-08-14 | 2009-08-14 | Centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201627733U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410250A (en) * | 2011-11-25 | 2012-04-11 | 上海交通大学 | Blade of centrifugal compressor applicable to gas with low molecular weight and compressor |
| CN109931289A (en) * | 2019-03-29 | 2019-06-25 | 上海理工大学 | A kind of vaneless diffuser of Voluteless fan |
-
2009
- 2009-08-14 CN CN2009202246212U patent/CN201627733U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410250A (en) * | 2011-11-25 | 2012-04-11 | 上海交通大学 | Blade of centrifugal compressor applicable to gas with low molecular weight and compressor |
| CN102410250B (en) * | 2011-11-25 | 2013-06-19 | 上海交通大学 | Blade of centrifugal compressor applicable to gas with low molecular weight and compressor |
| CN109931289A (en) * | 2019-03-29 | 2019-06-25 | 上海理工大学 | A kind of vaneless diffuser of Voluteless fan |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110529410B (en) | Mixed flow fan | |
| CN110374900B (en) | Mixed flow fan with sinusoidal meridian flow channel | |
| CN102506029A (en) | Impeller of centrifugal fan and centrifugal fan | |
| CN104653496A (en) | Single-double-suction adjustable centrifugal ventilator | |
| CN202937480U (en) | Multistage impeller centrifugal blower | |
| CN201891675U (en) | Centrifugal tunnel axial blower | |
| CN101949387B (en) | Wind tunnel-type fan | |
| CN201547015U (en) | Low-noise centrifugal wind wheel | |
| CN203163119U (en) | Fan outlet mesh enclosure with guide vanes for air conditioning outdoor unit | |
| CN201627733U (en) | Centrifugal fan | |
| CN110374925A (en) | A kind of bilayer collector and the flow-mixing blower fan for assembling the double-deck collector | |
| CN201582198U (en) | Centrifugal fan used for airflow spinning machine process | |
| CN203548269U (en) | Backward type centrifugal fan | |
| CN202228423U (en) | Centrifugal air blower of double-suction semi-open type impeller | |
| CN203189329U (en) | Centrifugal fan for the cement industry | |
| CN205207221U (en) | Fan | |
| CN102108978A (en) | Axial flow fan with secondary fan blades | |
| CN109595197A (en) | A kind of blower | |
| CN203189286U (en) | Medical fan | |
| CN203516184U (en) | Fan impeller | |
| CN209943193U (en) | Novel fan with blade structure | |
| CN201843798U (en) | Wind tunnel type fan | |
| CN206478739U (en) | A kind of ducting assembly | |
| CN213839007U (en) | Extended blade centrifugal impeller | |
| CN202991624U (en) | Combined serial blade grid local fan for mining |
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: 20101110 Termination date: 20120814 |