CN102003408A - Low specific speed centrifugal impeller with radial backflow holes - Google Patents
Low specific speed centrifugal impeller with radial backflow holes Download PDFInfo
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- CN102003408A CN102003408A CN 201010179446 CN201010179446A CN102003408A CN 102003408 A CN102003408 A CN 102003408A CN 201010179446 CN201010179446 CN 201010179446 CN 201010179446 A CN201010179446 A CN 201010179446A CN 102003408 A CN102003408 A CN 102003408A
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- impeller
- specific speed
- return port
- radially
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Abstract
The invention relates to a low specific speed centrifugal impeller with radial backflow holes, which is matched with a dry-type three-phase asynchronous motor or a submersible motor. The low specific speed centrifugal impeller is characterized by respectively machining the backflow holes in the axial direction of an impeller hub and in the radial direction of a locknut matching surface so that the liquid flow direction of the backflow holes is basically the same with the normal flow direction of the impeller blades, wherein the number of the backflow holes is the same as that of the blades. The invention has the advantages of avoiding disorder of liquid flow of inlets of the impeller blades, recycling the energy of liquid leaked by a rear impeller sealing ring, improving the efficiency of a water pump, and being beneficial to improving cavitation performance of the water pump.
Description
Affiliated technical field
The present invention is a kind of radially low specific speed centrifugal impeller of return port that has, the impeller design specific speed is less than 80, and the number of blade is greater than or equal to 3, seal ring before and after impeller has, and phase asynchronous dry type motor of supporting dry type or submersible motor belong to universal machine product manufacturing technology field.
Background technique
Low specific speed centrifugal pump has the advantages that flow is little, lift is high, is widely used in industries such as agricultural drainage and irrigation, mine, petrochemical industry.Have the characteristics that the blade exit width is less, impeller outer diameter is big, flow channel of axial plane is narrow and grow on the low specific speed centrifugal impeller geometrical shape.The low specific speed centrifugal impeller has forward and backward seal ring usually, the diameter of front and back seal ring is generally identical, offer axial return port between increasing back sealing ring and the wheel hub, the highly pressurised liquid that the impeller increasing back sealing ring leaks is back to the entry zone of impeller usually by axial return port, reduced the axial force that acts on the back shroud of impeller, make that the axial force that acts on the impeller is in a basic balance, usually the gross area of getting axial return port equals five times increasing back sealing ring interval area, and the leakage rate of return port is generally the 2%-5% of impeller design flow at this moment; Also there is mode to reflux in special-purpose connecting tube of pump outer installment.Because of low specific speed centrifugal impeller lift height, the leakage rate of impeller increasing back sealing ring gap location is bigger, original axial return port backflow direction comes flow path direction consistent with impeller, destroyed normal flowing state, the current disorder of impeller inlet place, the decrease in efficiency that causes pump, pump easily forms abnormal vibrations and noise, and the anti-cavitation performance of pump descends, when pump operation less than the design discharge operating point time, lift of pump is higher, and increasing back sealing ring place leakage rate is bigger, and the liquid that return port refluxes is bigger to the interference of impeller inlet incoming flow.If adopt the mode of special-purpose connecting tube of outer installment to reflux, one side pump structure complexity, the high pressure liquid stream energy of Hui Liuing can not reclaim on the other hand.
Summary of the invention
In order to improve existing low specific speed centrifugal impeller efficient and anti-cavitation performance, the invention provides and have the radially low specific speed centrifugal impeller of return port, be applicable to that the design specific speed is less than 80 loaw specific speed pump, the number of blade is greater than or equal to 3, can be used for single-stage pump or multistage pump, supporting dry type or submersible three phase asynchronous motor, make the leakage rate of low specific speed centrifugal impeller increasing back sealing ring be back to the direction with blade influent stream direction basically identical, reclaim the energy of highly pressurised liquid, improve the fluid pressure of blade inlet, make the efficient of low specific speed centrifugal pump and anti-cavitation performance improve.
The technical solution adopted for the present invention to solve the technical problems is:
Change the axial reflux type of low specific speed centrifugal pump impeller, the processing axial return port identical on impeller hub with the number of blade, and radially process return port at impeller locking nut fitting surface, impeller nut is with after impeller cooperates, original axial reflux type will change over radially and to reflux, and this radially refluxes identical substantially with impeller blade inlet flow direction.This will effectively improve the impeller internal flow, improve the low specific speed pump efficiency, improve the cavitation performance of loaw specific speed pump.
As long as increase hub diameter slightly, several axial return ports of processing do not influence wheel hub transmission impeller and rotate needed moment of torsion on impeller hub, and as long as directly boring; Also only need utilize the milling cutter cutting to get final product and radially process return port, even can directly cast out radially return port at impeller locking nut fitting surface.Therefore, the present invention increases cost of production hardly, and is very easy to realize.The invention has the beneficial effects as follows, improved the efficient of loaw specific speed pump, improved the cavitation performance of loaw specific speed pump, thereby provide the low specific speed centrifugal pump of reliable and energy-saving more to the user with minimum cost of production.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Accompanying drawing 1 is the main sectional view that does not adopt loaw specific speed pump example commonly used of the present invention; 1. pump housings among the figure, 2. impeller, 3. impeller nut, 4. return port, 5. impeller increasing back sealing ring, 6. impeller hub, 7. mechanical seal, 8. spool, 9. bearing support, 10. bearing.
Low specific speed impeller outlet liquid stream has high pressure and high-energy with respect to the impeller inlet district, a part of q of liquid stream will be through circumferential play, the return port 4 of impeller increasing back sealing ring 5, get back to the impeller inlet district once more, and the backflow direction of q is opposite with main flow direction, to form larger interference to main flow, make that pump efficiency reduces, cavitation performance descends.
Accompanying drawing 2 is not adopt low specific speed impeller commonly used of the present invention, and its return port is between increasing back sealing ring and wheel hub, and its backflow direction is opposite with main flow direction.
Accompanying drawing 3 is main sectional views of one embodiment of the invention; 1. pump housings among the figure, 2. impeller, 3. impeller nut, 4. return port, 5. impeller increasing back sealing ring, 6. impeller hub, 7. mechanical seal, 8. spool, 9. bearing support, 10. bearing.The reflux type of impeller 2 is changed into radially.
Embodiment
Radially the low specific speed centrifugal impeller of return port is mounted to running shaft, after impeller nut is tightened, the liquid stream that leaks from the impeller increasing back sealing ring will radially be back in the runner between two blades, compare with common low specific speed centrifugal impeller, and backflow direction and main flow direction do not have obvious bump.The present invention has only changed the direction of the operative position and the return port of return port, increases cost of production hardly.
Claims (1)
1. one kind has the radially low specific speed centrifugal impeller of return port, its auxiliary motor is dry type threephase asynchronous or submersible motor, and its water pump is single-stage or multistage centrifugal pump, seal ring before and after impeller has, the impeller design specific speed is less than 80, and the number of blade is greater than or equal to 3.It is characterized in that: axially processed the through hole identical on the wheel hub that impeller and transmission shaft cooperate with the number of blade; Processed return port radially on the locking nut fitting surface of impeller, this radially return port towards the opposite direction of the impeller rotation a certain angle of setovering, angle is the complementary angle of 0.5 times of blade interval angle, radially return port quantity is identical with the impeller blade number for this, and this radially return port and impeller hub axially the through hole of processing be communicated with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010179446 CN102003408B (en) | 2010-05-07 | 2010-05-07 | Low specific speed centrifugal impeller with radial backflow holes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010179446 CN102003408B (en) | 2010-05-07 | 2010-05-07 | Low specific speed centrifugal impeller with radial backflow holes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102003408A true CN102003408A (en) | 2011-04-06 |
| CN102003408B CN102003408B (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010179446 Active CN102003408B (en) | 2010-05-07 | 2010-05-07 | Low specific speed centrifugal impeller with radial backflow holes |
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| CN (1) | CN102003408B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434221A (en) * | 2011-10-19 | 2012-05-02 | 南京蓝深制泵集团股份有限公司 | Impeller of hydraulic turbine |
| CN103850947A (en) * | 2012-11-29 | 2014-06-11 | 上海凯士比泵有限公司 | Anti-cavitation vane pump |
| CN104235053A (en) * | 2014-08-22 | 2014-12-24 | 中国北方发动机研究所 | High-efficiency and low-specific speed centrifugal water pump |
| CN105220354A (en) * | 2015-11-19 | 2016-01-06 | 长乐力天针纺有限公司 | A kind of warp knitting machine |
| CN105697410A (en) * | 2014-11-28 | 2016-06-22 | 上海凯士比泵有限公司 | Centrifugal pump with high efficiency and high anti-cavitation performance |
| CN111102238A (en) * | 2019-12-23 | 2020-05-05 | 珠海格力电器股份有限公司 | Anti-cavitation impeller and water pump |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2122954U (en) * | 1991-10-29 | 1992-11-25 | 冯逸骅 | Multi-funcitonal electric pump |
| CN2229564Y (en) * | 1995-03-04 | 1996-06-19 | 辛育霖 | Non-leakage paddle pump |
| US20080304988A1 (en) * | 2007-06-11 | 2008-12-11 | Asmo Co., Ltd. | Pump apparatus, assembling method of the same and washer system for vehicle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2397289Y (en) * | 1999-02-13 | 2000-09-20 | 遵义海立水泵制造有限责任公司 | Submersible pump being electrically driven |
-
2010
- 2010-05-07 CN CN 201010179446 patent/CN102003408B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2122954U (en) * | 1991-10-29 | 1992-11-25 | 冯逸骅 | Multi-funcitonal electric pump |
| CN2229564Y (en) * | 1995-03-04 | 1996-06-19 | 辛育霖 | Non-leakage paddle pump |
| US20080304988A1 (en) * | 2007-06-11 | 2008-12-11 | Asmo Co., Ltd. | Pump apparatus, assembling method of the same and washer system for vehicle |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434221A (en) * | 2011-10-19 | 2012-05-02 | 南京蓝深制泵集团股份有限公司 | Impeller of hydraulic turbine |
| CN103850947A (en) * | 2012-11-29 | 2014-06-11 | 上海凯士比泵有限公司 | Anti-cavitation vane pump |
| CN104235053A (en) * | 2014-08-22 | 2014-12-24 | 中国北方发动机研究所 | High-efficiency and low-specific speed centrifugal water pump |
| CN105697410A (en) * | 2014-11-28 | 2016-06-22 | 上海凯士比泵有限公司 | Centrifugal pump with high efficiency and high anti-cavitation performance |
| CN105220354A (en) * | 2015-11-19 | 2016-01-06 | 长乐力天针纺有限公司 | A kind of warp knitting machine |
| CN111102238A (en) * | 2019-12-23 | 2020-05-05 | 珠海格力电器股份有限公司 | Anti-cavitation impeller and water pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102003408B (en) | 2013-01-02 |
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Address after: 212013 No. 301, Xuefu Road, Jiangsu, Zhenjiang Patentee after: Jiangsu University Patentee after: Lanshen Group Co., Ltd. Address before: 212013 No. 301, Xuefu Road, Jiangsu, Zhenjiang Patentee before: Jiangsu University Patentee before: Lanshen Pump Group Co., Ltd., Nanjing |