CN104251215B - Asynchronous transmission multistage centrifugal pump - Google Patents
Asynchronous transmission multistage centrifugal pump Download PDFInfo
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- CN104251215B CN104251215B CN201410492443.7A CN201410492443A CN104251215B CN 104251215 B CN104251215 B CN 104251215B CN 201410492443 A CN201410492443 A CN 201410492443A CN 104251215 B CN104251215 B CN 104251215B
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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 pump technical field is centrifuged, and in particular to asynchronous transmission centrifugal multistage pump multiple centrifugal pump.
Background technology
It is most of to be realized using centrifugal multistage pump multiple centrifugal pump in order to realize high-lift output.Conventional multi-level centrifugal pump is by multistage leaf
Wheel is installed step by step on a shaft, and lift adds up, high-lift so as to obtain.In some devices of petroleum chemical industry, to pump
Requirement it is harsh, not only require high-lift, also require especially low net positive suction head, energy-efficient, No leakage etc..In order to realize
Low net positive suction head, traditional method is：1. first-stage double-absorption formula impeller is selected.
2. inducer is set up in the suction side of first stage impeller.
3. MODEL VERTICAL MULTISTAGE PUMP is adopted, the first stage impeller of pump is arranged in lowly pump hole.
4. the rotating speed of multistage pump is reduced.
Conventional pump is solely limited to the net positive suction head effect of reduction pump using first-stage double-absorption formula impeller or inducer, energy
The limited extent of reduction.Meanwhile, in some actual design library part editor and reuses, because installation site, foundation of civil work are limited, do not allow to adopt
Use vertical pump.Net positive suction head is reduced by reducing the rotating speed of multistage pump, by formulaLearn, rotating speed declines, and raises
Journey can significantly be declined with the multiple of 2 powers, cause the series of pump excessive, cost of idleness, and when rotating speed declines, efficiency also declines.
The content of the invention
The present invention is aiming at the problems referred to above, there is provided one kind does not change centrifugal pump series, and net positive suction head is greatly lowered, and
Ensure the horizontal asynchronous transmission centrifugal multistage pump multiple centrifugal pump of lift.
To realize the above-mentioned purpose of the present invention, the present invention is adopted the following technical scheme that.The present invention includes the chopped-off head pump housing, chopped-off head
Double-sided impeller is provided with by chopped-off head axle in the pump housing, it is characterised in that：The water side of the chopped-off head pump housing passes through the same multistage pump of water pipe
The water inlet end of body is connected；Multi-stage impeller is provided with by multiple axle in the multistage pump body；The multiple axle is between chopped-off head axle
It is connected by change speed gear box.
Used as a preferred embodiment of the present invention, the chopped-off head axle is connected with the low one end of change speed gear box rotating speed；It is described multistage
Axle is connected with the high one end of change speed gear box rotating speed.
Used as another kind of preferred version of the present invention, one end and multiple axle two ends of the chopped-off head axle are provided with magnetic force connection
Axle device；The chopped-off head axle is connected by magnetic coupling with multiple axle with the change speed gear box.
Further preferred version, the magnetic coupling includes being arranged at the interior magnetic at chopped-off head axle one end and multiple axle two ends
Set, and the outer magnetic sleeve coordinated with inner magnetic sleeve；Outer magnetic sleeve on chopped-off head axle is connected with the outer magnetic sleeve of multiple axle one end with change speed gear box；
The two ends of the chopped-off head axle are provided with nonmetallic bearing between the chopped-off head pump housing；Corresponding to the one of change speed gear box on the chopped-off head pump housing
End is provided with thrust collar, and thrust collar is engaged with the end face of the nonmetallic bearing on chopped-off head axle；It is provided with thrust collar
The closure of isolation inner magnetic sleeve and outer magnetic sleeve；The two ends of the multiple axle have an end structure phase of magnetic coupling with chopped-off head axle
Together；Axle sleeve is provided between the nonmetallic bearing and chopped-off head axle of the chopped-off head axle other end, end face of shaft bush is by the locking on chopped-off head axle
Nut is provided with thrust button；It is provided with shaft-cup, shaft-cup corresponding to chopped-off head axle on the chopped-off head pump housing and is provided with only corresponding to thrust button
Thrust bearing.
Further preferred version, the shaft-cup connects the rinse jet of nonmetallic bearing with being provided with thrust collar.
Further preferred version, the rinse jet is connected by flush pipe with the chopped-off head pump housing or multistage pump body.
Beneficial effects of the present invention：1st, the present invention reduces first-stage double-absorption formula wheel rotation speed by arranging change speed gear box,
And improve the rotating speed of multi-stage impeller, constant so as to reach total series for ensureing pump, net positive suction head is than former double-sided impeller structure
The purpose being greatly lowered.
2nd, the present invention is connected change speed gear box with multiple axle with chopped-off head axle by magnetic coupling；Reduce change speed gear box and chopped-off head
Sealing structure between axle and multiple axle, reduces leakage point, improves sealing effectiveness.
3rd, using non-metallic shaft bearing structure, it is not necessary to rolling bearing, thrust ball bearing or Sliding bush, thrust pad axle
Hold, it is not necessary to grease or lubricating oil.Only gear-box needs lubricating oil or grease, reduces pollution, is particularly well-suited to cleaning
Liquid is conveyed.
4th, using without sealing structure, it is ensured that No leakage or atomic Small leak, it is particularly well-suited to petroleum chemical industry conveying easy
Combustion, explosive, volatile, poisonous and precious liquid.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the A portions enlarged drawing of Fig. 1.
Fig. 3 is the B portions enlarged drawing of Fig. 1.
In accompanying drawing 1 be flush pipe, 2 be the chopped-off head pump housing, 3 be double-suction-port ring, 4 be double-sided impeller, 5 be chopped-off head axle, 6 be magnetic
Power shaft coupling, 7 be change speed gear box, 8 be gear wheel, 9 be little gear, 10 be multiple axle, 11 be multi-stage impeller, 12 be 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 non-gold
Category bearing, 20 be axle sleeve, 21 be thrust collar, 22 be closure, 23 be inner magnetic sleeve, 24 be outer magnetic sleeve, 25 be water pipe.
Specific embodiment
The present invention includes chopped-off head axle 5 is provided with double-sided impeller 4 in the chopped-off head pump housing 2, the chopped-off head pump housing 2, and its feature exists
In：The water side of the chopped-off head pump housing 2 is connected by water pipe 25 with the water inlet end of the multistage pump housing 12；By many in the multistage pump housing 12
Level axle 10 is provided with multi-stage impeller 11；The multiple axle 10 is connected between chopped-off head axle 5 by change speed gear box 7.
Used as a preferred embodiment of the present invention, the chopped-off head axle 5 is connected with the low one end of the rotating speed of change speed gear box 7；It is described many
Level axle 10 is connected with the high one end of the rotating speed of change speed gear box 7.
Used as another kind of preferred version of the present invention, one end and the two ends of multiple axle 10 of the chopped-off head axle 5 are provided with magnetic
Power shaft coupling 6；The chopped-off head axle 5 is connected by magnetic coupling 6 with multiple axle 10 with the change speed gear box 7.
Further preferred version, the magnetic coupling 6 includes being arranged at the one end of chopped-off head axle 5 and the two ends of multiple axle 10
Inner magnetic sleeve 23, and the outer magnetic sleeve 24 coordinated with inner magnetic sleeve 23；The outer magnetic of outer magnetic sleeve 24 and the one end of multiple axle 10 on chopped-off head axle 5
Set 24 is connected with change speed gear box 7；The two ends of the chopped-off head axle 5 are with being provided with nonmetallic bearing 19 between the chopped-off head pump housing 2；The chopped-off head
One end on the pump housing 2 corresponding to change speed gear box 7 is provided with thrust collar 21, the nonmetallic bearing on thrust collar 21 and chopped-off head axle 5
19 end face is engaged；The closure 22 of isolation inner magnetic sleeve 23 and outer magnetic sleeve 24 is provided with thrust collar 21；The multiple axle
10 two ends have an end structure of magnetic coupling 6 identical with chopped-off head axle 5；The nonmetallic bearing 19 of the other end of chopped-off head axle 5 with
Axle sleeve 20 is provided between chopped-off head axle 5, the end face of axle sleeve 20 is provided with thrust button 17 by the locking nut 16 on chopped-off head axle 5；It is first
It is provided with shaft-cup 14, shaft-cup 14 corresponding to chopped-off head axle 5 on the level pump housing 2 and thrust button 17 is provided with thrust bearing 15.
Further preferred version, the shaft-cup 14 connects rushing for nonmetallic bearing 19 with being provided with thrust collar 21
Wash mouth 18.
Further preferred version, the rinse jet 18 by flush pipe 1 with the chopped-off head pump housing 2 or the multistage pump housing 12 inside
Connection.
The both sides of double-sided impeller 4 are provided with double-suction-port ring 3；Prevent liquid from flowing back.
The balance cylinder 13 of multi-stage impeller 11 is provided with the multistage pump housing 12；The non-metallic shaft of the one end of the multiple axle 10
Hold 19 to be arranged between balance cylinder 13 and multiple axle 10；The thrust collar 21 is arranged at the upper of balance cylinder 13.
The little gear 9 being connected with multiple axle 10 and the gear wheel 8 being connected with chopped-off head axle 5 are provided with the change speed gear box 7；Greatly
The girth of gear 8 is two times of the girth of little gear 9.
The nonmetallic bearing 19 adopts engineering plastics.
According to cavitation specific speed formula, single suction pump, double entry pumpLearn, as NPSHr and
The timing of Q-value one, only reducing rotating speed n can just obtain less C values.In order to ensure that the series of pump does not increase when rotating speed n is reduced
Plus it is excessive, first-stage double-absorption formula impeller 4 is designed as the slow-speed of revolution by the present invention, individually with an axle support rotating；Remaining multistage leaf
Wheel 11 supports high-speed rotation with another axle.
Jing is tested, and the present invention will use fixed drive ratio between multiple axle 10 and chopped-off head axle 5（2：1）Change speed gear box 7 connect.Drive
Power intake, is arranged on pump discharge high-pressure side.The rotating speed of multi-stage impeller 11 is designed as 2980r/min, is become by gear-box
Speed, drives to the rotating speed of first-stage double-absorption formula impeller 4 and is changed into 1490r/min.Consider hydraulic loss factor, in practice it has proved that, when under rotating speed
After drop half, the net positive suction head of pump is about the 0.3～0.4 of former rotating speed, it is ensured that the net positive suction head of pump is greatly lowered.
After the rotating speed of first-stage double-absorption formula impeller 4 is reduced, lift is the 25% of former rotating speed.Because remaining multi-stage impeller 11 is height
Rotating speed, you can compensation first-stage double-absorption formula impeller 4 is because reducing by 75% lift that rotating speed loses, it is ensured that total series of pump is constant.
Fixed drive ratio is adopted between two axles（2：1）Gear-box connection, in order to shorten the total length of pump, make up because increase
Gear-box causes the length of pump to increase, and the axle of first-stage double-absorption formula impeller 4 is built-in defeated using nonmetallic bearing 19, without sealing structure
Send medium self-lubricating thrust ring and shaft-cup 14.The axle of remaining multi-stage impeller 11 is also adopted by without metal bearing, without sealing structure, multistage
The axial force of impeller 11 is balanced by balancing frame.
When the present invention is used, motor（It is not shown）Rotating speed is 2980r/min, by the magnetic force shaft coupling of the right-hand member of multiple axle 10
Device 6（Driving force input）Multiple axle 10, multi-stage impeller 11 is driven to rotate, by the magnetic coupling 6 of the left end of multiple axle 10（It is multistage
The outfan of impeller 11）Moment of torsion is reached into change speed gear box 7, speed change to 1490r/min, by magnetic coupling 6（Double-entry impeller input）
Chopped-off head axle 5 and first-stage double-absorption formula impeller 4 is driven to rotate.Liquid is inhaled into by the both sides of first-stage double-absorption formula impeller 4, first-stage double-absorption formula
The both sides of impeller 4 are provided with double-suction-port ring 3 prevents liquid from flowing back.Liquid Jing first-stage double-absorption formulas impeller 4 enters pressure area, by chopped-off head pump
Oral siphon 25 is entered in the water side of body 2, enters back into the multistage pump housing 12, and by the multistage pump housing 12 highly pressurised liquid is exported, and meets engineering demand.
The pressure release backwater of the equalizing feature of multi-stage impeller 11 is connected to the low-pressure area of pump by balance cylinder 13.
It is understood that above with respect to the specific descriptions of the present invention, being merely to illustrate the present invention and being not limited to this
Technical scheme described by inventive embodiments, it will be understood by those within the art that, still the present invention can be carried out
Modification or equivalent, to reach identical technique effect；As long as meet use needs, all protection scope of the present invention it
It is interior.
Claims (6)
1. a kind of asynchronous transmission centrifugal multistage pump multiple centrifugal pump, including the chopped-off head pump housing（2）, the chopped-off head pump housing（2）It is interior by chopped-off head axle（5）It is provided with
Double-sided impeller（4）, it is characterised in that：The chopped-off head pump housing（2）Water side pass through water pipe（25）With the multistage pump housing（12）Water inlet
End is connected；The multistage pump housing（12）It is interior by multiple axle（10）It is provided with multi-stage impeller（11）；The multiple axle（10）With first
Level axle（5）Between pass through change speed gear box（7）It is connected；The chopped-off head axle（5）Same change speed gear box（7）The low one end of rotating speed is connected；It is described many
Level axle（10）Same change speed gear box（7）The high one end of rotating speed is connected；The chopped-off head axle（5）One end and multiple axle（10）Two ends are respectively provided with
There is magnetic coupling（6）；The chopped-off head axle（5）And multiple axle（10）By magnetic coupling（6）With the change speed gear box（7）Phase
Even；The magnetic coupling（6）Including being arranged at chopped-off head axle（5）One end and multiple axle（10）The inner magnetic sleeve at two ends（23）, and
Same inner magnetic sleeve（23）The outer magnetic sleeve of cooperation（24）；Chopped-off head axle（5）On outer magnetic sleeve（24）And multiple axle（10）The outer magnetic sleeve of one end
（24）Same change speed gear box（7）It is connected；The chopped-off head axle（5）Two ends with the chopped-off head pump housing（2）Between be provided with nonmetallic bearing（19）；
The chopped-off head pump housing（2）It is upper to correspond to change speed gear box（7）One end be provided with thrust collar（21）, thrust collar（21）With chopped-off head axle
（5）On nonmetallic bearing（19）End face be engaged；Thrust collar（21）On be provided with isolation inner magnetic sleeve（23）With outer magnetic sleeve
（24）Closure（22）；The multiple axle（10）Two ends with chopped-off head axle（5）With magnetic coupling（6）An end structure phase
Together；Chopped-off head axle（5）The nonmetallic bearing of the other end（19）With chopped-off head axle（5）Between be provided with axle sleeve（20）, axle sleeve（20）End face
By chopped-off head axle（5）On locking nut（16）It is provided with thrust button（17）；The chopped-off head pump housing（2）It is upper to correspond to chopped-off head axle（5）If
It is equipped with shaft-cup（14）, shaft-cup（14）It is interior corresponding to thrust button（17）It is provided with thrust bearing（15）；The nonmetallic bearing（19）
Using engineering plastics.
2. a kind of asynchronous transmission centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that：The shaft-cup（14）And thrust
The collar（21）On be provided with connection nonmetallic bearing（19）Rinse jet（18）.
3. a kind of asynchronous transmission centrifugal multistage pump multiple centrifugal pump according to claim 2, it is characterised in that：The rinse jet（18）Pass through
Flush pipe（1）With the chopped-off head pump housing（2）Or the multistage pump housing（12）Inside connection.
4. a kind of asynchronous transmission centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that：Double-sided impeller（4）Two
Side is provided with double-suction-port ring（3）.
5. a kind of asynchronous transmission centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that：The multistage pump housing（12）On
It is provided with multi-stage impeller（11）Balance cylinder（13）；The multiple axle（10）The nonmetallic bearing of one end（19）It is arranged at balance cylinder
（13）With multiple axle（10）Between；The thrust collar（21）It is arranged at balance cylinder（13）On.
6. a kind of asynchronous transmission centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that：The change speed gear box（7）Inside set
It is equipped with and multiple axle（10）Connected little gear（9）And with chopped-off head axle（5）Connected gear wheel（8）；Gear wheel（8）Girth be
Little gear（9）Two times of girth.
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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410492443.7A CN104251215B (en) | 2014-09-24 | 2014-09-24 | Asynchronous transmission multistage centrifugal pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104251215A CN104251215A (en) | 2014-12-31 |
| CN104251215B true CN104251215B (en) | 2017-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410492443.7A Active CN104251215B (en) | 2014-09-24 | 2014-09-24 | Asynchronous transmission multistage centrifugal pump |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Family Cites Families (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 |
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