CN105257547B - A kind of long-life high-efficiency multi-stage centrifugal pump - Google Patents
A kind of long-life high-efficiency multi-stage centrifugal pump Download PDFInfo
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- CN105257547B CN105257547B CN201510764980.7A CN201510764980A CN105257547B CN 105257547 B CN105257547 B CN 105257547B CN 201510764980 A CN201510764980 A CN 201510764980A CN 105257547 B CN105257547 B CN 105257547B
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Abstract
The invention belongs to water pump technologies, are specifically related to a kind of long-life high-efficiency multi-stage centrifugal pump.The long-life high-efficiency multi-stage centrifugal pump includes that first be set on pump shaft along pump shaft axial restraint pumps section, the second water pumping section and pump section positioned at first, the second water pumping section centre is used to be isolated the intermediate isolating set of the first water pumping section, the second water pumping section, the impeller direction in impeller and the second water pumping section in the first water pumping section is reversed, the water outlet of the first water pumping section is connected to the water inlet of the second water pumping section, and the described first impeller progression for pumping section pumps level-one or two-stage more than section impeller progression than second.Impeller asymmetric distribution can effectively reduce intermediate isolating set pressure at two ends in the first water pumping section, the second water pumping section in the present invention, reduce leakage rate and improve volumetric efficiency, reduce abrasion to provide service life.Efficiency at least 5%~15% can be improved in the occasion of conveying solid substance particle using the long-life high-efficiency multi-stage centrifugal pump of the design production of the technology, the service life extends 30%~100%.
Description
Technical field
The invention belongs to water pump technologies, are specifically related to a kind of long-life efficient and long life high-efficiency multi-stage centrifugal pump.
Background technology
Centrifugal multistage pump multiple centrifugal pump is a kind of pump that a kind of range of flow is wide, lift is relatively high, impeller at least there are two.It is more at present
There are mainly two types of grade centrifugal pump structure patterns：Arranged in series centrifugal multistage pump multiple centrifugal pump (with balancing frame or balancing drum), the symmetrical cloth in both ends
Set centrifugal multistage pump multiple centrifugal pump.
1) arranged in series centrifugal multistage pump multiple centrifugal pump
This is a kind of centrifugal multistage pump multiple centrifugal pump of most original, and structural shape is a kind of vertical subdivision centrifugal multistage pump multiple centrifugal pump, it is by one
A leading portion, a back segment and several stage casings composition, an entirety is connected as with four bolt of long stem.Leaf on pump shaft
The number of wheel just represents the series of centrifugal pump, and each impeller in stage casing matches a guide vane, and the effect of guide vane is substantially the same as spiral case phase
Together, static energy is mainly converted kinetic energy into.Impeller is generally single suction, inhales population both facing to a direction.For balance shaft
Xiang Li is equipped with balancing frame behind latter end, balance pipe is used in combination to be connected with leading portion import.Its rotor during the work time can edge
Axial left and right play maintains rotor near equilbrium position by the axial force of the thrust-balancing impeller sets of balancing frame.The two of axis
End is supported with bearing, is placed on bearing block, and there is gland seal device at the both ends of axis.
2) both ends are arranged symmetrically centrifugal multistage pump multiple centrifugal pump
The impeller progression of this structure centrifugal multistage pump multiple centrifugal pump is even number.Pump is intermediate to be arranged a separation sleeve, the two of separation sleeve
While being distributed the impeller of identical quantity, impeller is to install back-to-back, and the axial force of the centrifugal multistage pump multiple centrifugal pump of this structure is by back-to-back
Impeller autobalance.
But no matter that arrangement linkage, there is following functions defect or deficiency, influence pump efficiency and use
Service life.
1) arranged in series centrifugal multistage pump multiple centrifugal pump structure axial force cannot balance, and a set of balancing frame or balancing drum device is needed to put down
Weigh axial force.Since the axial force of arranged in series centrifugal multistage pump multiple centrifugal pump can not achieve self-balancing, by its balancing frame or balancing drum
Friction pair realizes balance or counteracting, therefore the type pump balancing axial power apparatus abrasion is very fast, be that the maximum of this kind of structure is thin
Weak place.Especially in the case where pumped medium contains solid particle, the service life of this structure pump is extremely short, is no more than sometimes
15 days, the average life span 1-2 months.It has been eliminated gradually in this structure pump in the case where conveying the mixture condition containing particle.
2) both ends are arranged symmetrically centrifugal multistage pump multiple centrifugal pump and completely eliminate axial force by spontaneous structure.In structure, balance is eliminated
Disk and balancing drum balancing axial power apparatus, eliminate the friction pair in low service life, and service life increases.But due in the structure
Between guide bearing both sides exist and be equivalent to the pressure difference of pump lift half.This pressure difference is larger, causes to leak at intermediate isolating set
It measures larger, less efficient.Simultaneously because High Pressure Difference flowing can also cause intermediate isolating set abrasion aggravation, for containing solid particle
Pump it is particularly evident.The centrifugal multistage pump multiple centrifugal pump that pumped medium contains this kind of structural shape of solid particle at present put down by general service life
It is 6 months or so.
Invention content
The present invention provides a kind of long-life high-efficiency multi-stage centrifugal pump, which can be significantly increased microcosmic flow resistance, reduce and let out
Leakage loss is lost, reduces wear extent, to improve the service life of pump, the operational efficiency of increasing pump.
In order to achieve the object of the present invention, present invention employs following technical schemes：
A kind of long-life high-efficiency multi-stage centrifugal pump, this centrifugal pump include being set on pump shaft successively along pump shaft axial restraint
First pumped, which pumps section, the second water pumping section and pumped positioned at the first water pumping section, second, is used to be isolated the first water pumping among section
Section, second pump section intermediate isolating set, it is described first pump section in impeller and second pump section in impeller direction it is opposite
Setting, the water outlet of the first water pumping section are connected to the water inlet of the second water pumping section, and described first pumps the impeller progression of section
Level-one or two-stage more than the second water pumping section impeller progression.
Further technical solution：Impeller and second in the first water pumping section pump the impeller in section facing away from centre
Separation sleeve is arranged.
Further technical solution：Described first pumps and is equipped with the in section between highest impeller back and intermediate isolating set
One sealing opening ring；Described second pumps highest impeller back and intermediate isolating in section is equipped with the second sealing opening ring between covering.
Further technical solution：The intermediate isolating set includes the interior isolation being radially sequentially arranged from inside to outside along pump shaft
Set, outer separation sleeve, the outer separation sleeve side are equipped with through the outer rinse mouth that sleeve wall thickness is isolated and is communicated with interior separation sleeve.
Further technical solution：The draw ratio of the intermediate isolating set is more than 2.
Further technical solution：First sealing opening ring is arranged close to pump spindle center line, and the second sealing opening ring is separate
Pump spindle center line is arranged, and the outer separation sleeve is equipped with the seal groove for accommodating the first sealing opening ring, the second sealing opening ring.
Further technical solution：The rinse mouth pumps section setting close to first.
The beneficial effects of the present invention are：
(1) impeller asymmetric distribution can effectively reduce intermediate isolating set in the first water pumping section, the second water pumping section in the present invention
Pressure at two ends reduces leakage rate and improves volumetric efficiency, reduces abrasion to provide service life.It is produced using the design of the technology
Long-life high-efficiency multi-stage centrifugal pump can improve efficiency at least 5%~15% in the occasion of conveying solid substance particle, the service life extends
30%~50%.
(2) in the case of impeller asymmetric arrangement, due to the throttling action of the sealing opening ring of impeller overleaf so that fluid
Flow resistance greatly increase, greatly reduce leakage rate and wear rate in this way.
(3) draw ratio that the present invention selects is conducive to increase flow resistance, reduces leakage rate, and can reduce intermediate isolating set
Effective area of passage, reduce leakage rate, be conducive to improve efficiency, prolong the service life.
Description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is the partial structural diagram between the first water pumping section superlative degree impeller and intermediate isolating set.
Fig. 3 is the partial structural diagram between the second water pumping section superlative degree impeller and intermediate isolating set.
The concrete meaning of reference numeral is as follows in attached drawing：
10- pump shafts 20- first pumps section 30- second and pumps section 40- intermediate isolating sets
Outer separation sleeve 43- rinse mouths the first sealing opening rings of 51- of separation sleeve 42- in 41-
The second sealing opening rings of 52-
Specific implementation mode
Structure of the invention is further described below in conjunction with the accompanying drawings：
As shown in Figure 1：A kind of long-life high-efficiency multi-stage centrifugal pump, the long-life high-efficiency multi-stage centrifugal pump includes along pump shaft
The first water pumping section 20, second that 10 axial restraints are set on pump shaft 10 pumps section 30 and pumps section 20, second positioned at first
The intermediate isolating set 40 for pumping section 30 among section 30 for the first water pumping section 20, second to be isolated is pumped, described first pumps section 20
In impeller and second water pumping section 30 in impeller direction be reversed, it is described first pump section 20 water outlet with second water pumping
The water inlet connection of section 30, the described first impeller progression for pumping section 20 pump level-one or two more than 30 impeller progression of section than second
Grade.
It is preferred that the described first impeller pumped in impeller and the second water pumping section 30 in section 20 covers 40 facing away from intermediate isolating
Setting.
According to the above-mentioned technical solution：A primary object of the invention is the even number impeller knot for arranging conventional symmetric
Configuration formula is changed to the structural shape of odd number impeller asymmetric arrangement.The total series of impeller is designed as odd number, low-pressure area leaf by calculating
Wheel always than higher-pressure region impeller more arranges one；It is even number also under a few cases, at this moment low-pressure area impeller is than higher-pressure region impeller
Mostly 2 impellers of arrangement and asymmetric arrangement.Although the axial force of pump is unable to autobalance, but its axial force is equivalent to level-one
Pump generate power, this axial force is smaller, by pump end thrust bearing can balance completely with its axial force of arrester, be not necessarily to axis
To thrust balancing device.
In addition, impeller asymmetric distribution can effectively reduce intermediate isolating set pressure at two ends, reduces leakage rate and improve volume effect
Rate reduces abrasion to provide service life.Its principles and methods is as follows：
Assuming that pump lift (pressure head) is P, the total series of impeller of pump is n,
In the case that impeller is arranged symmetrically, second water pumping section 30 (higher-pressure region) maximum pressure is the pressure head P of pump, and first pumps
Section 20 (low-pressure area) maximum pressures beThen 40 both ends pressure differences of intermediate isolating set are：
In the case of impeller asymmetric arrangement, second water pumping section 30 (higher-pressure region) maximum pressure is the pressure head P of pump, the first pump
Water section 20 (low-pressure area) maximum pressure is(it is n to pump total series, by low-pressure area series more than the series of higher-pressure region based on 1 grade
Calculate) then intermediate isolating cover 40 pressure at two ends differences be：
It will be reduced by the pressure difference of asymmetric design intermediate isolating set 40 in this way：
Pressure difference slip is：
By hydrodynamics method, when other conditions are definite value, the leakage rate of intermediate isolating set 40：
Then the ratio of different impeller arrangement leakage rates is：
| Series | 3 | 5 | 7 | 9 | 11 | 13 |
| Leak relative quantity % | 81.6 | 89.4 | 92.6 | 94.3 | 95.3 | 96.1 |
| Leak decrement % | 18.4 | 10.6 | 7.4 | 5.7 | 4.7 | 3.9 |
Different series effects are different, and series is smaller, and effect is better.Therefore make that series is few as far as possible when we design.
If other conditions are the same, the intermediate isolating of pump covers 40 wear rates and is inversely proportional with flowing velocity square, in
Between at separation sleeve 40 fluid-flow rate and leakage rate in directly proportional, therefore：
| Series | 3 | 5 | 7 | 9 | 11 | 13 |
| Service life relative quantity | 1.50 | 1.25 | 1.17 | 1.13 | 1.1 | 1.08 |
Further technical solution：It is set between highest impeller back and intermediate isolating set 40 in the first water pumping section 20
There is the first sealing opening ring 51；Second to be equipped between highest impeller back and intermediate isolating set 40 close in the second water pumping section 30
Seal mouth ring 52.First sealing opening ring 51 is arranged close to 10 center line of pump shaft, and the second sealing opening ring 52 is far from 10 center of pump shaft
Line is arranged, and the outer separation sleeve 42 is equipped with the seal groove for accommodating the first sealing opening ring 51, the second sealing opening ring 52.Leaf of the present invention
In the case of taking turns asymmetric arrangement, due to the throttling action of the sealing opening ring of highest wheel backface so that the flowing of fluid hinders
Power greatly increases, and greatly reduces leakage rate in this way and reduces wear rate.First, which pumps section 20 and second, pumps section 30 due to pressure
Power size distribution is different, the first sealing opening ring 51, the second sealing opening ring 52 position be arranged according to the above technical scheme, such as scheme
2, shown in 3, it can be only achieved optimum efficiency in this way.
The intermediate isolating set 40 includes along radial interior separation sleeve 41, the outer separation sleeve being sequentially arranged from inside to outside of pump shaft 10
42,42 side of outer separation sleeve is equipped with the rinse mouth 43 for running through 42 wall thickness of outer separation sleeve and being communicated with interior separation sleeve 41.In
Between at separation sleeve 40 setting rinse mouth 43 be mainly the flow resistance for further increasing fluid in intermediate isolating set 40, reduce leakage
Amount, increases the flowing for blocking particulate matter, and lubrication intermediate isolating set 40 improves the working environment of intermediate isolating set 40.By rinse mouth
43 a little higher than multistage centrifugal pump discharge pressures of external flushing water pressure entered, due to the rinse mouth 43 on intermediate isolating set 40
Hydraulic pressure is higher than impeller pressure at two ends, therefore particulate matter can further be blocked to enter intermediate isolating set 40, and lubrication improves intermediate isolating
Set 40 reduces wear rate, improves working life.Since 43 hydraulic pressure of rinse mouth on intermediate isolating set 40 is higher than two side pressure of impeller
Power, therefore can further block the second water pumping section 30 to pump section 20 to first and flow, volumetric loss is reduced, volumetric efficiency is improved.
Rinse mouth 43 pumps section 20 close proximity to first and is arranged, in order to reduce flushing water pressure.
The draw ratio of the intermediate isolating set 40 is more than 2, and it is advantageous if other conditions are the same to lengthen axial dimension
In increasing flow resistance, leakage rate is reduced；Radial dimension is reduced, then can reduce effective area of passage of intermediate isolating set, is reduced
Leakage rate is conducive to improve efficiency, prolong the service life.
Claims (3)
1. a kind of long-life high-efficiency multi-stage centrifugal pump, it is characterised in that：This centrifugal pump includes being arranged along pump shaft (10) axial restraint
On pump shaft (10) pump successively first pump section (20), second pump section (30) and positioned at first pump section (20),
Intermediate isolating set (40) among second water pumping section (30) for the first water pumping section (20), the second water pumping section (30) to be isolated, it is described
The impeller direction in impeller and the second water pumping section (30) in first water pumping section (20) is reversed, and described first pumps section (20)
Water outlet with second water pumping section (30) water inlet be connected to, it is described first pump section (20) impeller progression than second water pumping section
(30) the more level-ones of impeller progression or two-stage；
In the first water pumping section (20) the first sealing opening ring is equipped between highest impeller back and intermediate isolating set (40)
(51)；In the second water pumping section (30) the second sealing opening ring is equipped between highest impeller back and intermediate isolating set (40)
(52)；
The intermediate isolating set (40) includes along the radial interior separation sleeve (41) being sequentially arranged from inside to outside of pump shaft (10), outer isolation
It covers (42), the outer separation sleeve (42) is equipped with the rinse mouth for running through outer separation sleeve (42) wall thickness and being communicated with interior separation sleeve (41)
(43)；
The draw ratio of the intermediate isolating set (40) is more than 2, and the draw ratio of the intermediate isolating set (40) refers to intermediate isolating set
(40) the ratio between the interior diameter of axial length and intermediate isolating set (40)；
The rinse mouth (43) pumps section (20) close to first and is arranged.
2. long-life high-efficiency multi-stage centrifugal pump as described in claim 1, it is characterised in that：Described first pumps in section (20)
Impeller in impeller and the second water pumping section (30) is arranged facing away from intermediate isolating set (40).
3. long-life high-efficiency multi-stage centrifugal pump as described in claim 1, it is characterised in that：First sealing opening ring (51) is leaned on
Nearly pump shaft (10) center line setting, the second sealing opening ring (52) are arranged far from pump shaft (10) center line, the outer separation sleeve (42)
It is equipped with the seal groove for accommodating the first sealing opening ring (51), the second sealing opening ring (52).
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| CN201510764980.7A CN105257547B (en) | 2015-11-10 | 2015-11-10 | A kind of long-life high-efficiency multi-stage centrifugal pump |
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| CN201510764980.7A CN105257547B (en) | 2015-11-10 | 2015-11-10 | A kind of long-life high-efficiency multi-stage centrifugal pump |
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| CN105257547B true CN105257547B (en) | 2018-09-21 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2097301U (en) * | 1991-04-05 | 1992-02-26 | 煤炭科学研究总院唐山分院 | Cinder pulp pump of asymmetric impeller group self-balance |
| US6179553B1 (en) * | 1998-03-30 | 2001-01-30 | Sulzer Weise Gmbh | Multiple stage centrifugal pump |
| CN1439808A (en) * | 2002-07-10 | 2003-09-03 | 甘肃工业大学 | Multistage sectional centrifugal pump with symmetric impeller arrangement |
| CN1779275A (en) * | 2004-11-19 | 2006-05-31 | 上海东方泵业(集团)有限公司 | Improved axial force balancing structure of shielded pump |
| CN201265547Y (en) * | 2008-09-23 | 2009-07-01 | 长沙佳能通用泵业有限公司 | Balancing type single-suction horizontal multiple-stage centrifugal pump |
| CN204061194U (en) * | 2014-08-18 | 2014-12-31 | 湖南天一奥星泵业有限公司 | The radial subdivision centrifugal pump of two-stage single suction |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202250880U (en) * | 2011-08-02 | 2012-05-30 | 辽宁恒星泵业有限公司 | Horizontal split-case double-volute multistage centrifugal pump |
| CN202811460U (en) * | 2012-10-25 | 2013-03-20 | 浙江佳力科技股份有限公司 | Multistage middle-open type centrifugal pump axial force balance structure |
| CN204163994U (en) * | 2014-10-16 | 2015-02-18 | 大连深蓝泵业有限公司 | The section self-balanced horizontal multi-stage centrifugal pump of mono-hull |
-
2015
- 2015-11-10 CN CN201510764980.7A patent/CN105257547B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2097301U (en) * | 1991-04-05 | 1992-02-26 | 煤炭科学研究总院唐山分院 | Cinder pulp pump of asymmetric impeller group self-balance |
| US6179553B1 (en) * | 1998-03-30 | 2001-01-30 | Sulzer Weise Gmbh | Multiple stage centrifugal pump |
| CN1439808A (en) * | 2002-07-10 | 2003-09-03 | 甘肃工业大学 | Multistage sectional centrifugal pump with symmetric impeller arrangement |
| CN1779275A (en) * | 2004-11-19 | 2006-05-31 | 上海东方泵业(集团)有限公司 | Improved axial force balancing structure of shielded pump |
| CN201265547Y (en) * | 2008-09-23 | 2009-07-01 | 长沙佳能通用泵业有限公司 | Balancing type single-suction horizontal multiple-stage centrifugal pump |
| CN204061194U (en) * | 2014-08-18 | 2014-12-31 | 湖南天一奥星泵业有限公司 | The radial subdivision centrifugal pump of two-stage single suction |
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Address after: 230031 No. 888 Changjiang West Road, Shushan District, Hefei, Anhui. Applicant after: Hefei General Machinery Research Institute Co., Ltd. Address before: 230031 No. 888 Changjiang West Road, Shushan District, Hefei, Anhui. Applicant before: Hefei Universal Machinery Inst. |
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