CN104251215A - Asynchronous transmission multistage centrifugal pump - Google Patents
Asynchronous transmission multistage centrifugal pump Download PDFInfo
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- CN104251215A CN104251215A CN201410492443.7A CN201410492443A CN104251215A CN 104251215 A CN104251215 A CN 104251215A CN 201410492443 A CN201410492443 A CN 201410492443A CN 104251215 A CN104251215 A CN 104251215A
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Abstract
The invention discloses an asynchronous transmission multistage centrifugal pump, belongs to the technical field of centrifugal pumps, and particularly relates to asynchronous transmission multistage centrifugal pumps. The asynchronous transmission multistage centrifugal pump comprises a primary pump body. A double-sided impeller is arranged in the primary pump body via a primary shaft. The asynchronous transmission multistage centrifugal pump is characterized in that a water outlet end of the primary pump body is connected with a water inlet end of a multistage pump body; a multistage impeller is arranged in the multistage pump body via a multistage shaft; the multistage shaft is connected with the primary shaft by a gearbox. The asynchronous transmission multistage centrifugal pump has the advantages that the net positive suction head can be greatly reduced without changing the number of stages of the centrifugal pump, and the lift of the horizontal asynchronous transmission multistage centrifugal pump can be guaranteed.
Description
Technical field
The invention belongs to centrifugal pump technical field, be specifically related to asynchronous transmission multistage centrifugal pump.
Background technique
In order to realize high-lift output, major part adopts multistage centrifugal pump to realize.Conventional multi-level centrifugal pump is installed step by step on a shaft by multi-stage impeller, and lift adds up, thus obtains high-lift.In some device of petroleum chemical industry, harsh to the requirement of pump, not only require high-lift, also require net positive suction head low especially, energy-efficient, No leakage etc.In order to realize low net positive suction head, traditional method is: 1. select first-stage double-absorption formula impeller.
2. set up inducer in the suction side of first stage impeller.
3. adopt MODEL VERTICAL MULTISTAGE PUMP, the first stage impeller of pump is arranged in lowly pump hole.
4. reduce the rotating speed of multistage pump.
Conventional pump solely adopts first-stage double-absorption formula impeller or inducer to reduction NPSH limited efficiency, the limited extent that can reduce.Meanwhile, in some design library part editor and reuse of reality, due to mounting point, foundation of civil work restriction, do not allow to adopt vertical pump.Net positive suction head is reduced, by formula by the rotating speed reducing multistage pump
learn, rotating speed declines, and lift significantly can decline with the multiple of 2 powers, and cause the progression of pump too much, cost of idleness, when rotating speed declines, efficiency also declines.
Summary of the invention
The present invention is exactly for the problems referred to above, provides one not change centrifugal pump progression, significantly reduces net positive suction head, and ensures the horizontal asynchronous transmission multistage centrifugal pump of lift.
For realizing above-mentioned purpose of the present invention, the present invention adopts following technological scheme.The present invention includes the chopped-off head pump housing, in the chopped-off head pump housing, chopped-off head axle is provided with double-sided impeller, it is characterized in that: the waterexit end of the chopped-off head pump housing is connected by the feed-water end of water pipe with the multistage pump housing; In the described multistage pump housing, multiple axle is provided with multi-stage impeller; Described multiple axle is connected by gearbox with between chopped-off head axle.
As a preferred embodiment of the present invention, described chopped-off head axle is connected with one end that gearbox rotating speed is low; Described multiple axle is connected with one end that gearbox rotating speed is high.
As another kind of preferred version of the present invention, one end and the multiple axle two ends of described chopped-off head axle are provided with magnetic coupling; Described chopped-off head axle is connected with described gearbox by magnetic coupling with multiple axle.
Further preferred version, described magnetic coupling comprises the inner magnetic sleeve being arranged at chopped-off head axle one end and multiple axle two ends, and with the outer magnetic sleeve that inner magnetic sleeve coordinates; Outer magnetic sleeve on chopped-off head axle is connected with gearbox with the outer magnetic sleeve of multiple axle one end; The two ends of described chopped-off head axle are provided with nonmetallic bearing with between the chopped-off head pump housing; One end corresponding to gearbox on the described chopped-off head pump housing is provided with thrust collar, and thrust collar matches with the end face of the nonmetallic bearing on chopped-off head axle; Thrust collar is provided with the sealing cover of isolation inner magnetic sleeve and outer magnetic sleeve; The end structure that the two ends of described multiple axle have magnetic coupling with chopped-off head axle is identical; Be provided with axle sleeve between the nonmetallic bearing of the chopped-off head axle the other end and chopped-off head axle, end face of shaft bush is provided with thrust button by the locking nut on chopped-off head axle; The chopped-off head pump housing is provided with shaft-cup corresponding to chopped-off head axle, in shaft-cup, thrust button is provided with thrust bearing.
Further preferred version, described shaft-cup is communicated with the rinse jet of nonmetallic bearing with thrust collar is provided with.
Further preferred version, described rinse jet is communicated with the chopped-off head pump housing or multistage pump body by cleaning hose.
Beneficial effect of the present invention: 1, the present invention is by arranging gearbox, first-stage double-absorption formula wheel rotation speed is reduced, and improve the rotating speed of multi-stage impeller, thus the total progression reaching guarantee pump is constant, the object that net positive suction head significantly reduces than former double-sided impeller structure.
2, gearbox is connected with multiple axle with chopped-off head axle by magnetic coupling by the present invention; Decrease gearbox and the sealing configuration between chopped-off head axle and multiple axle, reduce leakage point, improve sealing effect.
3, adopt non-metallic shaft bearing structure, do not need rolling bearing, thrust ball bearing or Sliding bush, thrust pad bearing, do not need lubricating grease or lubricant oil.Only have gear-box to need lubricant oil or lubricating grease, decreasing pollution, be specially adapted to clean liquid conveying.
4, adopt without sealing configuration, ensure No leakage or atomic Small leak, be specially adapted to inflammable, explosive, volatile, the poisonous and precious liquid of petroleum chemical industry conveying.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the A portion enlarged view of Fig. 1.
Fig. 3 is the B portion enlarged view of Fig. 1.
In accompanying drawing, 1 is cleaning hose, 2 is the chopped-off head pump housing, 3 is double-suction-port ring, 4 is double-sided impeller, 5 is chopped-off head axle, 6 is magnetic coupling, 7 is gearbox, 8 is gearwheel, 9 is small gear, 10 is multiple axle, 11 is multi-stage impeller, 12 is the multistage pump housing, 13 is balance cylinder, 14 is shaft-cup, 15 is thrust bearing, 16 is locking nut, 17 is thrust button, 18 is rinse jet, 19 is nonmetallic bearing, 20 is axle sleeve, 21 is thrust collar, 22 is sealing cover, 23 is inner magnetic sleeve, 24 is outer magnetic sleeve, 25 is water pipe.
Embodiment
The present invention includes the chopped-off head pump housing 2, in the chopped-off head pump housing 2, chopped-off head axle 5 is provided with double-sided impeller 4, it is characterized in that: the waterexit end of the chopped-off head pump housing 2 is connected by the feed-water end of water pipe 25 with the multistage pump housing 12; In the described multistage pump housing 12, multiple axle 10 is provided with multi-stage impeller 11; Described multiple axle 10 is connected by gearbox 7 with between chopped-off head axle 5.
As a preferred embodiment of the present invention, described chopped-off head axle 5 is connected with one end that gearbox 7 rotating speed is low; Described multiple axle 10 is connected with one end that gearbox 7 rotating speed is high.
As another kind of preferred version of the present invention, one end and multiple axle 10 two ends of described chopped-off head axle 5 are provided with magnetic coupling 6; Described chopped-off head axle 5 is connected with described gearbox 7 by magnetic coupling 6 with multiple axle 10.
Further preferred version, described magnetic coupling 6 comprises the inner magnetic sleeve 23 being arranged at chopped-off head axle 5 one end and multiple axle 10 two ends, and with the outer magnetic sleeve 24 that inner magnetic sleeve 23 coordinates; Outer magnetic sleeve 24 on chopped-off head axle 5 is connected with gearbox 7 with the outer magnetic sleeve 24 of multiple axle 10 one end; The two ends of described chopped-off head axle 5 are provided with nonmetallic bearing 19 with between the chopped-off head pump housing 2; One end corresponding to gearbox 7 on the described chopped-off head pump housing 2 is provided with thrust collar 21, and thrust collar 21 matches with the end face of the nonmetallic bearing 19 on chopped-off head axle 5; Thrust collar 21 is provided with the sealing cover 22 of isolation inner magnetic sleeve 23 and outer magnetic sleeve 24; The end structure that the two ends of described multiple axle 10 have magnetic coupling 6 with chopped-off head axle 5 is identical; Be provided with axle sleeve 20 between the nonmetallic bearing 19 of chopped-off head axle 5 the other end and chopped-off head axle 5, axle sleeve 20 end face is provided with thrust button 17 by the locking nut 16 on chopped-off head axle 5; The chopped-off head pump housing 2 is provided with shaft-cup 14 corresponding to chopped-off head axle 5, in shaft-cup 14, thrust button 17 is provided with thrust bearing 15.
Further preferred version, described shaft-cup 14 is communicated with the rinse jet 18 of nonmetallic bearing 19 with thrust collar 21 is provided with.
Further preferred version, described rinse jet 18 is communicated with the chopped-off head pump housing 2 or the multistage pump housing 12 inside by cleaning hose 1.
The both sides of double-sided impeller 4 are provided with double-suction-port ring 3; Prevent liquid backflow.
The described multistage pump housing 12 is provided with the balance cylinder 13 of multi-stage impeller 11; The nonmetallic bearing 19 of described multiple axle 10 one end is arranged between balance cylinder 13 and multiple axle 10; Described thrust collar 21 is arranged at the upper of balance cylinder 13.
The gearwheel 8 being provided with the small gear 9 be connected with multiple axle 10 in described gearbox 7 and being connected with chopped-off head axle 5; Gearwheel 8 girth be two times of small gear 9 girth.
Described nonmetallic bearing 19 adopts engineering plastics.
According to cavitation specific speed formula, single entry pump
, double suction pump
learn, when NPSHr and Q value one timing, to only have reduction rotating speed n just can obtain less C value.In order to ensure that the progression of pump does not increase too much, and first-stage double-absorption formula impeller 4 is designed to the slow-speed of revolution by the present invention when reducing rotating speed n, separately with an axle support rotating; Another root axle of remaining multi-stage impeller 11 supports high speed rotating.
Through test, the present invention connects between multiple axle 10 and chopped-off head axle 5 with the gearbox 7 of fixed drive ratio (2:1).Driving force input end, is arranged on pump discharge high pressure side.The axle Design of Rotation of multi-stage impeller 11 is 2980r/min, by gear-box speed change, drives to first-stage double-absorption formula impeller 4 rotating speed and becomes 1490r/min.Consider hydraulic loss factor, facts have proved, when after rotating speed drop by half, NPSH is about 0.3 ~ 0.4 of former rotating speed, ensures that NPSH significantly reduces.
After first-stage double-absorption formula impeller 4 rotating speed reduces, lift is 25% of former rotating speed.Because remaining multi-stage impeller 11 is high rotating speed, first-stage double-absorption formula impeller 4 can being compensated because reducing by 75% lift of rotating speed loss, ensureing that total progression of pump is constant.
The gear-box of fixed drive ratio (2:1) is adopted to connect between two axles, in order to shorten the total length of pump, make up and cause the length of pump to increase because increasing gear-box, the axle of first-stage double-absorption formula impeller 4 employing nonmetallic bearing 19, without sealing configuration, built-in fed sheet of a media selflubricating thrust ring and shaft-cup 14.The axle of all the other multi-stage impellers 11 also adopts without metal bearing, without sealing configuration, and the axial force of multi-stage impeller 11 is balanced by Balance disc.
When the present invention uses, motor (not shown) rotating speed is 2980r/min, magnetic coupling 6(driving force input end by multiple axle 10 right-hand member) drive multiple axle 10, multi-stage impeller 11 rotates, magnetic coupling 6(multi-stage impeller 11 output terminal by multiple axle 10 left end) moment of torsion is reached gearbox 7, speed change to 1490r/min, by magnetic coupling 6(double-entry impeller input end) drive chopped-off head axle 5 and first-stage double-absorption formula impeller 4 to rotate.Liquid is inhaled into by the both sides of first-stage double-absorption formula impeller 4, and the both sides of first-stage double-absorption formula impeller 4 are provided with double-suction-port ring 3 and prevent liquid backflow.Liquid enters pressure area through first-stage double-absorption formula impeller 4, enters water pipe 25 by the waterexit end of the chopped-off head pump housing 2, then enters the multistage pump housing 12, exports highly pressurised liquid, meet engineering demand by the multistage pump housing 12.The pressure release backwater of multi-stage impeller 11 equalizing feature is connected to the low pressure area of pump by balance cylinder 13.
Be understandable that, above about specific descriptions of the present invention, the technological scheme described by the embodiment of the present invention is only not limited to for illustration of the present invention, those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, to reach identical technique effect; Needs are used, all within protection scope of the present invention as long as meet.
Claims (10)
1. an asynchronous transmission multistage centrifugal pump, comprise the chopped-off head pump housing (2), in the chopped-off head pump housing (2), chopped-off head axle (5) is provided with double-sided impeller (4), it is characterized in that: the waterexit end of the chopped-off head pump housing (2) is connected by the feed-water end of water pipe (25) with the multistage pump housing (12); In the described multistage pump housing (12), multiple axle (10) is provided with multi-stage impeller (11); Described multiple axle (10) is connected by gearbox (7) with between chopped-off head axle (5).
2. the asynchronous transmission multistage centrifugal pump of one according to claim 1, is characterized in that: one end that described chopped-off head axle (5) same to gearbox (7) rotating speed is low is connected; One end that described multiple axle (10) same to gearbox (7) rotating speed is high is connected.
3. the asynchronous transmission multistage centrifugal pump of one according to claim 1, is characterized in that: one end and multiple axle (10) two ends of described chopped-off head axle (5) are provided with magnetic coupling (6); Described chopped-off head axle (5) is connected with described gearbox (7) by magnetic coupling (6) with multiple axle (10).
4. the asynchronous transmission multistage centrifugal pump of one according to claim 1, it is characterized in that: described magnetic coupling (6) comprises the inner magnetic sleeve (23) being arranged at chopped-off head axle (5) one end and multiple axle (10) two ends, and the outer magnetic sleeve (24) that same inner magnetic sleeve (23) coordinates; Outer magnetic sleeve (24) on chopped-off head axle (5) is connected with outer magnetic sleeve (24) the same to gearbox (7) of multiple axle (10) one end; The two ends of described chopped-off head axle (5) are provided with nonmetallic bearing (19) with between the chopped-off head pump housing (2); One end corresponding to gearbox (7) on the described chopped-off head pump housing (2) is provided with thrust collar (21), and thrust collar (21) matches with the end face of the nonmetallic bearing (19) on chopped-off head axle (5); Thrust collar (21) is provided with the sealing cover (22) of isolation inner magnetic sleeve (23) and outer magnetic sleeve (24); The end structure that the two ends of described multiple axle (10) have magnetic coupling (6) with chopped-off head axle (5) is identical; Be provided with axle sleeve (20) between the nonmetallic bearing (19) of chopped-off head axle (5) the other end and chopped-off head axle (5), axle sleeve (20) end face is provided with thrust button (17) by the locking nut (16) on chopped-off head axle (5); The chopped-off head pump housing (2) is provided with shaft-cup (14) corresponding to chopped-off head axle (5), in shaft-cup (14), thrust button (17) is provided with thrust bearing (15).
5. the asynchronous transmission multistage centrifugal pump of one according to claim 1, is characterized in that: described shaft-cup (14) with thrust collar (21) is provided with the rinse jet (18) being communicated with nonmetallic bearing (19).
6. the asynchronous transmission multistage centrifugal pump of one according to claim 1, is characterized in that: described rinse jet (18) is communicated with the chopped-off head pump housing (2) or the multistage pump housing (12) inside by cleaning hose (1).
7. the asynchronous transmission multistage centrifugal pump of one according to claim 1, is characterized in that: the both sides of double-sided impeller (4) are provided with double-suction-port ring (3).
8. the asynchronous transmission multistage centrifugal pump of one according to claim 1, is characterized in that: the balance cylinder (13) the described multistage pump housing (12) being provided with multi-stage impeller (11); The nonmetallic bearing (19) of described multiple axle (10) one end is arranged between balance cylinder (13) and multiple axle (10); Described thrust collar (21) is arranged at the upper of balance cylinder (13).
9. the asynchronous transmission multistage centrifugal pump of one according to claim 1, is characterized in that: be provided with the small gear (9) be connected with multiple axle (10) and the gearwheel (8) be connected with chopped-off head axle (5) in described gearbox (7); Gearwheel (8) girth be two times of small gear (9) girth.
10. the asynchronous transmission multistage centrifugal pump of one according to claim 1, is characterized in that: described nonmetallic bearing (19) adopts engineering plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410492443.7A CN104251215B (en) | 2014-09-24 | 2014-09-24 | Asynchronous transmission multistage centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410492443.7A CN104251215B (en) | 2014-09-24 | 2014-09-24 | Asynchronous transmission multistage centrifugal pump |
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| Publication Number | Publication Date |
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| CN104251215A true CN104251215A (en) | 2014-12-31 |
| CN104251215B CN104251215B (en) | 2017-04-26 |
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| CN201410492443.7A Active CN104251215B (en) | 2014-09-24 | 2014-09-24 | Asynchronous transmission multistage centrifugal pump |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109951046A (en) * | 2019-04-04 | 2019-06-28 | 河北国创石油设备有限公司 | A kind of stator structure of oil-submersible linear lifting power device |
| CN109980889A (en) * | 2019-04-04 | 2019-07-05 | 河北国创石油设备有限公司 | A kind of Structure of mover of oil-submersible linear lifting power device |
| CN111706513A (en) * | 2020-07-27 | 2020-09-25 | 沈阳启源工业泵制造有限公司 | Combined low-cavitation multistage centrifugal pump |
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| CN2093253U (en) * | 1990-12-03 | 1992-01-15 | 黄友益 | Ac/dc powered dual-purpose miniature oil pump |
| CN101325360A (en) * | 2008-07-14 | 2008-12-17 | 大连理工大学 | Magnetic force driver |
| CN101737335A (en) * | 2008-11-07 | 2010-06-16 | 李永胜 | High-lift multi-stage centrifugal pump |
| JP5318254B2 (en) * | 2012-06-14 | 2013-10-16 | 株式会社酉島製作所 | Horizontal shaft pump |
| CN203394838U (en) * | 2013-08-15 | 2014-01-15 | 沈阳三科水力机械制造有限公司 | Industrial pump for nuclear power station |
| CN204267302U (en) * | 2014-09-24 | 2015-04-15 | 沈阳启源工业泵制造有限公司 | A kind of asynchronous transmission multistage centrifugal pump |
-
2014
- 2014-09-24 CN CN201410492443.7A patent/CN104251215B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2093253U (en) * | 1990-12-03 | 1992-01-15 | 黄友益 | Ac/dc powered dual-purpose miniature oil pump |
| CN101325360A (en) * | 2008-07-14 | 2008-12-17 | 大连理工大学 | Magnetic force driver |
| CN101737335A (en) * | 2008-11-07 | 2010-06-16 | 李永胜 | High-lift multi-stage centrifugal pump |
| JP5318254B2 (en) * | 2012-06-14 | 2013-10-16 | 株式会社酉島製作所 | Horizontal shaft pump |
| CN203394838U (en) * | 2013-08-15 | 2014-01-15 | 沈阳三科水力机械制造有限公司 | Industrial pump for nuclear power station |
| CN204267302U (en) * | 2014-09-24 | 2015-04-15 | 沈阳启源工业泵制造有限公司 | A kind of asynchronous transmission multistage centrifugal pump |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109951046A (en) * | 2019-04-04 | 2019-06-28 | 河北国创石油设备有限公司 | A kind of stator structure of oil-submersible linear lifting power device |
| CN109980889A (en) * | 2019-04-04 | 2019-07-05 | 河北国创石油设备有限公司 | A kind of Structure of mover of oil-submersible linear lifting power device |
| CN111706513A (en) * | 2020-07-27 | 2020-09-25 | 沈阳启源工业泵制造有限公司 | Combined low-cavitation multistage centrifugal pump |
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| CN104251215B (en) | 2017-04-26 |
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