CN102116316A - Axial-flow pump - Google Patents
Axial-flow pump Download PDFInfo
- Publication number
- CN102116316A CN102116316A CN 201010603290 CN201010603290A CN102116316A CN 102116316 A CN102116316 A CN 102116316A CN 201010603290 CN201010603290 CN 201010603290 CN 201010603290 A CN201010603290 A CN 201010603290A CN 102116316 A CN102116316 A CN 102116316A
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- Prior art keywords
- blade
- tip
- axial
- flow pump
- impeller
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Abstract
The invention relates to an axial-flow pump which comprises an enclosure, the interior of the enclosure is provided with an impeller, and the blade tip clearance size of the blade of the impeller is shortened by 20-30% compared with the normal size; the blade tip clearance size, close to a blade basin, of the blade is 2-3 times of that close to a blade back; the blade is of a wing type, and the tip part of the blade is cut into a tip top; the twist angle from the tip part of the blade to the middle part of the blade is improved by 5%; and an equal circulation design is adopted for the twisting of the blade, wherein the processing amount of the tip part of the blade is improved by 2% compared with the design value. The influence of tip leakage flow can be reduced effectively by adopting a tip top cutting structure and shortening the blade tip clearance, the loss is reduced, and the efficiency of the axial-flow pump is improved; and in addition, beacause the tip top cutting structure is thinner, if the enclosure is knocked in the running process of the impeller, greater loss can not be caused, the structure is simple, and the axial-flow pump is easy to realize, and the performance is improved.
Description
Technical field
The present invention relates to field of fluid machinery, especially relate to a kind of axial-flow pump that can increase work efficiency.
Background technique
Pump is widely used in the every field of national economy, and centrifugal pump and axial-flow pump are two kinds of main structural types of pump.The impeller that the blade of centrifugal pump is common and front and rear cover plate formation runner seals all around.The impeller of axial-flow pump only is made up of blade and wheel hub, between blade and frame radial clearance is arranged.In the process of wheel rotation, fluid is revealed from radial clearance, and forms whirlpool, causes bigger hydraulic loss, influences the working efficiency of axial-flow pump.
Summary of the invention
Technical problem to be solved by this invention provides and a kind ofly can reduce tip leakage stream, the axial-flow pump of increasing work efficiency.
The present invention solves the technological scheme that its technical problem takes: a kind of axial-flow pump, comprise casing, casing inside is provided with impeller, and the tip clearance size of the blade of described impeller has dwindled 20～30% than stock size, and wherein stock size is between 1～2mm.
Owing to rotate shell is caused damage, described blade is of a size of near the tip clearance size of blade back 2～3 times near the tip clearance at leaf basin place in order to reduce blade, and described blade is airfoil, and blade tip is whittled into the pinnacle.
In order to effectively reduce the influence of tip leakage stream, described blade tip improves 5% to blade middle part distortion angle.
The design of circular rectors such as described leaf curling employing, wherein the blade tip amount of finish improves 2% than design load.
Effect intentionally of the present invention is: dwindle tip clearance and adopt leaf top sharpening roof construction can effectively reduce the influence of tip leakage stream, reduce the loss, improve the working efficiency of axial-flow pump.In addition, because the sharpening roof construction is thinner, if run into casing in the impeller running, also can not cause bigger damage, simple in structure, the convenient realization improved performance.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is an airfoil blade of the present invention.
Among the figure: 1, blade 2, blade back 3, casing 4, leaf basin
Embodiment
A kind of as depicted in figs. 1 and 2 axial-flow pump comprises casing 3, and casing 3 inside are provided with impeller, and the ratio stock size of the tip clearance size of the blade 1 of described impeller (being the distance between blade tip and the casing 3) has dwindled 20～30%; The tip clearance at described blade 1 close leaf basin 4 places is of a size of 2～3 times near the tip clearance size of blade back 2; Described blade 1 is airfoil, and blade 1 tip is whittled into the pinnacle; Described blade 1 tip improves 5% to blade 1 middle part distortion angle; Circular rector designs such as described blade 1 distortion employing, wherein blade 1 tip amount of finish improves 2% than design load.
By dwindling the influence that the tip clearance size has effectively reduced tip leakage stream, axial-flow pump is improved working power good effect, because the sharpening roof construction is thinner, if run into casing in the impeller running, also can not cause bigger damage.
Claims (5)
1. an axial-flow pump comprises casing, and casing inside is provided with impeller, it is characterized in that: the tip clearance size of the blade of described impeller has dwindled 20～30% than stock size.
2. axial-flow pump according to claim 1 is characterized in that: the tip clearance at the close leaf basin place of described blade is of a size of 2～3 times near the tip clearance size of blade back.
3. axial-flow pump according to claim 1 is characterized in that: described blade is airfoil, and blade tip is whittled into the pinnacle.
4. axial-flow pump according to claim 1 is characterized in that: described blade tip improves 5% to blade middle part distortion angle.
5. axial-flow pump according to claim 1 is characterized in that: the design of circular rectors such as described leaf curling employing, wherein the blade tip amount of finish improves 2% than design load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010603290 CN102116316A (en) | 2010-12-24 | 2010-12-24 | Axial-flow pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010603290 CN102116316A (en) | 2010-12-24 | 2010-12-24 | Axial-flow pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102116316A true CN102116316A (en) | 2011-07-06 |
Family
ID=44215210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010603290 Pending CN102116316A (en) | 2010-12-24 | 2010-12-24 | Axial-flow pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102116316A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59165896A (en) * | 1984-03-07 | 1984-09-19 | Hitachi Ltd | Vane shape of axial-flow type fluid device |
| US4957411A (en) * | 1987-05-13 | 1990-09-18 | Societe Nationale D'etude Et De Construction De Moteurs D'aviaton S.N.E.C.M.A. | Turbojet engine with fan rotor blades having tip clearance |
| JPH09291897A (en) * | 1996-04-26 | 1997-11-11 | Toshiba Corp | Axial compressor |
| CN2809292Y (en) * | 2005-06-24 | 2006-08-23 | 上海尔华杰机电装备制造有限公司 | Flexible fan blade |
-
2010
- 2010-12-24 CN CN 201010603290 patent/CN102116316A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59165896A (en) * | 1984-03-07 | 1984-09-19 | Hitachi Ltd | Vane shape of axial-flow type fluid device |
| US4957411A (en) * | 1987-05-13 | 1990-09-18 | Societe Nationale D'etude Et De Construction De Moteurs D'aviaton S.N.E.C.M.A. | Turbojet engine with fan rotor blades having tip clearance |
| JPH09291897A (en) * | 1996-04-26 | 1997-11-11 | Toshiba Corp | Axial compressor |
| CN2809292Y (en) * | 2005-06-24 | 2006-08-23 | 上海尔华杰机电装备制造有限公司 | Flexible fan blade |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110706 |