CN1080837C - Method for increasing pumping-effciency and reducing specific gravity - Google Patents
Method for increasing pumping-effciency and reducing specific gravity Download PDFInfo
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- CN1080837C CN1080837C CN98113325A CN97107100A CN1080837C CN 1080837 C CN1080837 C CN 1080837C CN 98113325 A CN98113325 A CN 98113325A CN 97107100 A CN97107100 A CN 97107100A CN 1080837 C CN1080837 C CN 1080837C
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Abstract
The present invention relates to a pump, particularly to a compensation measure which improves the pump efficiency and reduces the proportion. The measure is formed by that compensation is obtained by a deceleration and impeller diameter change mode when the proportion is increased and the efficiency is reduced because of a series type spectrum; after the impeller diameter is changed, the tight coupling and matching can be still kept with a parameter in a corresponding position of a respective corresponding pump body by a variable pump body cut-water part, the light section area I of the pump body can be increased into 10-40% of design section area according to a conventional rule, and the large section area VIII of the pump body can be reduced into less than 20 % of the design section area according to a conventional rule.
Description
The present invention relates to pump, specifically a kind of indemnifying measure that improves pump efficiency and reduce weight/power ratio.
According to domestic and international statistics, the energy that pump consumed accounts for about 20% of whole generated energy, thereby, improve constantly the energy indexes of pump, develop the problem that new energy-saving pump series product have become world today's property.Simultaneously, exchanging bigger functional parameter for less input also is people's long term studies direction.
Under specified criteria, improve the energy indexes of pump, mainly be the efficient that improves pump, increase the functional parameter of pump, be mainly the weight/power ratio that reduces pump, require also that efficiency curve is smooth, flow-head curve falls suddenly and do not have hump and promptly do not have upper right characteristic.
In the sample of " pump energy-conserving product, introducing product, new product sample ", " modern pump technical manual " and world-renowned pump company and research report, all can see the serial type spectrum and the comprehensive complete performance of pump, wherein, be description that reduces pump and the using scope that enlarges pump, serial type spectrum is often realized by reduction of speed and cutting impeller.
Work is with the rated specification of same size pump foundation as a comparison, reduction of speed must reduce the function of pump, cutting must reduce the efficient of pump, in other words, though reduction of speed and cutting can make same pump performance specification change, but also only be to use at most with the pump that the pump of a large-size substitutes a reduced size, reduce for the function that reduction of speed brought, be that weight/power ratio increases the (weight of the weight/power ratio unit of being meant useful horsepower, useful horsepower utilizable flow and lift embody) and cut the energy loss that is caused, system pump industry and user thereof tolerate that for a long time weight/power ratio increases more than 30% and efficient reduces the still spendable viewpoint of 4-8%, must think a kind of technology prejudice.
From the combined characteristic that 4 pump cuttings of prior art obtain, enumerate following one group of data: pump number flow Q (m
3/ h) lift H (m) impeller diameter D2 (mm) efficiency eta (%) A1 490 31 355 84.5C1 460 18 300 7,6A2 480 57 442 8,2C2 460 38.5 390 7,3A3 65 22 139 7,6C3 65 14 120 6,9A4 100 22 139 7,8C4 100 14 120 69
Wherein the impeller of A1 pump (declared working condition) cuts into the impeller of C1 pump (small impeller operating mode), and the impeller of A2 pump cuts into the impeller of C2 pump, and the rest may be inferred by analogy.4 pumps are after cutting reaches pre-determined characteristics, the efficient 4-8% that on average descends, weight/power ratio rises 40%, if can return to original level of efficiency by new technological scheme is all or part of, then the energy cost in its Life cycle, saved of this pump will be this pump cost 4-10 doubly.At present, design, the manufacture method of pump become better and approaching perfection day by day, and the efficient of general service pump is about every year on average can to improve 0.1%, and the exhaustion day by day of resource more can not be sat by and watch the raw-material waste that reduction of speed brings.
Yet, the various functions of pump and skill are through index itself, and for realizing that these functions and skill are mutual restriction, interdependence through each design parameter of index, intercouple, mate mutually, and must be guaranteed by good process means, still, up to now, though through making great efforts in many ways, still attend to one thing and lose sight of another, in addition, " various countries entirely so " makes people be reluctant to pay extra cost to overcome it again.
The objective of the invention is to seek the loss that a kind of minimizing is caused because of reduction of speed and cutting, to improve the method for pump efficiency and reduction weight/power ratio.Its main technical schemes is that the weight/power ratio that caused when obtaining serial type spectrum by reduction of speed and the mode that changes impeller diameter increases and the decline of efficient, compensates with following mode: a changes the back and pairing pump housing region of interest parameter such as pitch angle alpha will A, base circle diameter (BCD) D3A and spiral initial angle Φ A utilize a variable pump housing cut water portion still to keep it to be coupled closely and mate separately at impeller diameter; B, increase pump housing light section area I to the 10-40% of design section area routinely, reduce the big cross-sectional area VIII of the pump housing to design section area routinely 20% in; Impeller after diameter changes, the Changing Pattern of its vane thickness from entrance point to outlet end longshore current line length of run L is two end part thickness 2R1, be approximately equal to 2R2 and be approximately equal to 1/3rd of interior thickness T, interior thickness T is calculated by intensity and chooses, entrance length L1 is approximately equal to 0.3L, middle part length is approximately equal to 0.25L, and exit length L2 is approximately equal to 0.45L; To the small impeller operating mode, directly cast by the blade metal mold of different size and form by its impeller diameter from declared working condition for the vane thickness Changing Pattern; Impeller makes every effort to approaching into and out of the numerical value of bicker β 1 and β 2, when being difficult to realize on the waterpower, β 2 is controlled in 32, and the variation of β value is controlled in the 1-2 near the outlet, variable pump housing cut water mould can be directly fixed on pump body core when making mould, also can utilize intermediate to connect.Variable pump housing cut water portion realizes by variable cut water mould, in case after having selected cut water mould under pump body core and certain operating mode, its pump housing cut water portion that produces is just immutable.
When impeller does not change, this is coupling, the harmonious even part of coupling to hydraulic component for it and pumping chamber, but impeller is once change, and these harmonious relationships are promptly destroyed, desire to make up the mismatch that this destruction is caused, must keep the coupling again of impeller outlet part and pumping chamber cut water portion.Advantage of the present invention is because the cut water mould on the pump body core makes interchangeable, during fabrication, only need to change the cut water mould, just can obtain the different several pump housings of the identical cut water of other parts portion, the variable of pump housing cut water portion is after guaranteeing that impeller diameter changes, still make related parameter keep one of key factor of close-coupled coupling, thereby improved the efficient of pump.Secondly, when design, suitably increase pump housing light section area, reduce the big cross-sectional area of the pump housing, thereby compare, reduced weight/power ratio with conventional design.The 3rd, cutting mode is not adopted in the change of impeller diameter, but form with the direct casting of the blade metal mold of different size, and the thickness of blade changes according to certain rules, impeller carried out suitable adjustment into and out of bicker, after impeller diameter was changed, various parameters still were in the optimum state, and the shape that original the sort of cutting mode can make impeller be cut end changes, destroyed the coupling state before the cutting, the energy indexes of pump and functional parameter are all descended.
Fig. 1 is the matching relationship figure of the pump housing and impeller.
Fig. 2 is the structural drawing of pump body core and interchangeable cut water mould.
Fig. 3 is given vane thickness Changing Pattern.
Describe technological scheme of the present invention in detail below in conjunction with accompanying drawing.
Among Fig. 1,1 is the pump housing, 2 cut water portions when being declared working condition, and 3 cut water portions when for a change becoming the small impeller operating mode, 4 is the impeller outlet end, and 5 is the declared working condition impeller, and 6 is small impeller operating mode impeller, and 7 is the impeller inlet end.Impeller outer diameter when D2A is A pump declared working condition, blade outlet angle are that β 2, inlet angle are β 1, with the A impeller is complementary are, cut water pitch angle alpha will A, base circle diameter (BCD) D3A, spiral initial angle Φ A, I is a pump housing pumping chamber light section, and VIII is big section, and D1 is the impeller inlet diameter.
Among Fig. 2,8 is pump body core, and 9 for connecting the mould intermediates of interchangeable cut water mould, and 10 be bolt, and 11 be nut, and 12 when being declared working condition and the cut water mould that mates of impeller, and 13 when being the small impeller operating mode and the cut water mould that mates of impeller.Interchangeable cut water mould is location and installation and connect transition with relative dimensions is smooth properly, to guarantee the correctness of each hydraulic parameters.
L is the length of run along the blade streamline among Fig. 3, and T is the blade interior thickness, and two end part thickness is 2R1 ≈ 2R2 ≈ T/3, inducer L1 ≈ 0.3L, the middle part is approximately 0.25L, and each segment length numerical value of outlet section L2 ≈ 0.45L needn't be very accurate, but each blade of same impeller is answered identical and can be exchanged installation.
Be example with the middle-size and small-size centrifugal pump series of one step single sucking below, serial performance and skill through index are flow Q=4-1980m
3/ h; Lift H=8-170m; Rotation speed n=1450,2950r/min.Flow-head curve makes every effort to not have hump.
Compare with identical bore IS pump (ISO-2858 that adopts international standards, structural parameter are basic identical), each skill footpath index is changed to, efficiency eta, and rated point on average improves (4-8%) behind reduction of speed, the change impeller diameter; Weight/power ratio B, the uniform pressure grade reduces 20-40%.
For keep declared working condition similar as far as possible with the speed of small impeller operating mode, when calculating, β 1 and β 2 curves need the variation of straight or near β 2 values of outlet in 1-2, make every effort to β 2 values in 32 °, and utilize different cut water moulds must make A, B, each grade of C impeller diameter be matched with corresponding pumping chamber pitch angle alpha will A, α B, α C, guarantee the best straight D3A of basic circle, D3B, D3C and spiral initial angle Φ A, Φ B, the Φ C that streams the gap.For simplifying the mould of cut water mould; usually Φ C＞Φ B＞Φ A, and cut water mould can directly connect with the pump body core matrix, also can utilize intermediate to connect; wherein A, B, C represent the declared working condition and the small impeller operating mode of the same pump housing respectively, and B is any operating mode that is between A, C.Only represent two kinds of operating modes of A, C among the figure, do not illustrated the B operating mode.The pumping chamber helix angle is aforementioned cut water helix angle.
2, for reducing weight/power ratio and improving the performance curve shape, pump housing cross-section size is carried out following correction, press cross-sectional flow Vu=constant or speed square VuR=constant, after calculating VIII section and I cross-sectional area, the VIII cross-sectional area multiply by correction factor K1 (K1=0.8-1.0, low specific speed get big value); The I cross-sectional area multiply by correction factor K2 (K2=1.1-1.4, low specific speed gets the small value), the transition in proportion of middle surface of discontinuity.
3, vane thickness calculates by intensity and to ask for interior thickness T, two end part thickness is T/3, and middle transition is undertaken by above-mentioned given Changing Pattern.
4, mould, identical for impeller mold A, B, C third gear external mold, blade is made (blade section can only change outlet section when making) by different-diameter.Interchangeable cut water mould is with the high-abrasive material delicate execution, and changes flexibly by the production schedule.
Blade is imported and exported the limit as processing location, measuring basis, does not carry out any cutting after the test typing, and front and rear cover plate can cut redundance.
Above technical measures can make product when enlarging using scope, raise the efficiency, and reduce weight/power ratio, and comparable cost reduces, and is expected to obtain significant techno-economic effect.
Claims (5)
1, a kind of method that improves pump efficiency and reduce weight/power ratio, weight/power ratio that serial type spectrum causes increases and the decline of efficient compensates for obtaining by reduction of speed and the mode that changes impeller diameter, it is characterized in that a, change back and pairing pump housing region of interest parameter such as pitch angle alpha will A separately at impeller diameter, base circle diameter (BCD) D3A and spiral initial angle Φ A utilize a variable pump housing cut water portion still to keep it to be coupled closely and mate, b, increase pump housing light section area I to the 10-40% of design section area routinely, reduce the big cross-sectional area VIII of the pump housing to design section area routinely 20% in.
2, method according to claim 1, it is characterized in that the impeller after diameter changes, the Changing Pattern of its vane thickness from entrance point (7) to outlet end (4) longshore current line length of run L is that two end part thickness 2R1 is approximately equal to 2R2 and is approximately equal to 1/3rd of interior thickness T, entrance length L1 is approximately equal to 0.3L, middle part length is similar to 0.25L, exit length L2 is approximately equal to 0.45L, and interior thickness T is calculated by intensity and chooses.
3, according to claim 1,2 described methods, it is characterized in that the vane thickness Changing Pattern from declared working condition to the small impeller operating mode, its impeller diameter by the blade metal mold of different size directly casting form.
4, method according to claim 1 is characterized in that impeller makes every effort to approaching into and out of the numerical value of bicker β 1 and β 2, and when being difficult to realize on the waterpower, β 2 is controlled in 32, and the variation of β value is controlled in the 1-2 near the outlet.
5, method according to claim 1, when it is characterized in that making mould, variable pump housing cut water mould can be directly fixed on pump body core, also can utilize intermediate to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98113325A CN1080837C (en) | 1997-08-27 | 1997-08-27 | Method for increasing pumping-effciency and reducing specific gravity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98113325A CN1080837C (en) | 1997-08-27 | 1997-08-27 | Method for increasing pumping-effciency and reducing specific gravity |
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| Publication Number | Publication Date |
|---|---|
| CN1209509A CN1209509A (en) | 1999-03-03 |
| CN1080837C true CN1080837C (en) | 2002-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98113325A Expired - Lifetime CN1080837C (en) | 1997-08-27 | 1997-08-27 | Method for increasing pumping-effciency and reducing specific gravity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101092974B (en) * | 2006-06-19 | 2010-05-12 | 高其海 | Spiral case of centrifugal type fluids machinery |
| CN102734228A (en) * | 2012-06-29 | 2012-10-17 | 江苏国泉泵业制造有限公司 | Method for designing guide vane of helical axial-flow pump |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062123A (en) * | 2012-11-07 | 2013-04-24 | 江苏大学 | Centrifugal pump volute structure capable of reducing noises and racial forces |
| CN103089707A (en) * | 2013-03-11 | 2013-05-08 | 中国船舶重工集团公司第七0四研究所 | Centrifugal-type modularized volute |
| CN103267018A (en) * | 2013-06-03 | 2013-08-28 | 高邮市高农机械配件有限公司 | Internal combustion engine cooling water pump water suction chamber runner |
| CN105332950B (en) * | 2015-11-09 | 2017-10-20 | 江苏大学 | A kind of centrifugal pump with low-noise characteristic |
| CN112324711A (en) * | 2020-11-04 | 2021-02-05 | 上海凯士比泵有限公司 | Volute with performance adjusting function and volute pump |
| CN112287619A (en) * | 2020-11-05 | 2021-01-29 | 中国船舶工业集团公司第七0八研究所 | Impeller design method for series type spectrum of water jet propulsion device and impeller hydraulic model |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT395944B (en) * | 1989-12-29 | 1993-04-26 | Schima Heinrich | A centrifugal blood pump with an uncovered rotor |
| CN2226164Y (en) * | 1995-06-29 | 1996-05-01 | 张景云 | Disintegrating type centrifugal pump |
| CN2228149Y (en) * | 1995-09-21 | 1996-05-29 | 杜碧华 | Constant speed helical force pump |
| US5549451A (en) * | 1992-12-07 | 1996-08-27 | Lyda, Jr.; Eldon L. | Impelling apparatus |
| CN2236033Y (en) * | 1995-03-30 | 1996-09-25 | 陈和祺 | Centrifugal pump structure |
| CN2248257Y (en) * | 1995-02-16 | 1997-02-26 | 袁明亮 | Blade type pump |
-
1997
- 1997-08-27 CN CN98113325A patent/CN1080837C/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT395944B (en) * | 1989-12-29 | 1993-04-26 | Schima Heinrich | A centrifugal blood pump with an uncovered rotor |
| US5549451A (en) * | 1992-12-07 | 1996-08-27 | Lyda, Jr.; Eldon L. | Impelling apparatus |
| CN2248257Y (en) * | 1995-02-16 | 1997-02-26 | 袁明亮 | Blade type pump |
| CN2236033Y (en) * | 1995-03-30 | 1996-09-25 | 陈和祺 | Centrifugal pump structure |
| CN2226164Y (en) * | 1995-06-29 | 1996-05-01 | 张景云 | Disintegrating type centrifugal pump |
| CN2228149Y (en) * | 1995-09-21 | 1996-05-29 | 杜碧华 | Constant speed helical force pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101092974B (en) * | 2006-06-19 | 2010-05-12 | 高其海 | Spiral case of centrifugal type fluids machinery |
| CN102734228A (en) * | 2012-06-29 | 2012-10-17 | 江苏国泉泵业制造有限公司 | Method for designing guide vane of helical axial-flow pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1209509A (en) | 1999-03-03 |
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