CN110425153A - A kind of lift prediction technique of centrifugal pump - Google Patents
A kind of lift prediction technique of centrifugal pump Download PDFInfo
- Publication number
- CN110425153A CN110425153A CN201910623409.1A CN201910623409A CN110425153A CN 110425153 A CN110425153 A CN 110425153A CN 201910623409 A CN201910623409 A CN 201910623409A CN 110425153 A CN110425153 A CN 110425153A
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- China
- Prior art keywords
- centrifugal pump
- lift
- gap
- impeller
- wearing
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
Abstract
The present invention provides a kind of lift prediction techniques of centrifugal pump, include the steps of determining that the centrifugal pump for not occurring wearing initialized gap values δ between impeller and sealing ring0；Determine gap width δ of the centrifugal pump for occurring wearing between impeller and sealing ring；According to gap difference DELTA δ and there is the centrifugal pump measured discharge Q worn1, correct the lift for the centrifugal pump for occurring wearing.The present invention can predict the centrifugal pump lift for occurring after abrasion by the wearing clearance value between measurement impeller and sealing ring.
Description
Technical field
The present invention relates to the performance prediction field of pump, in particular to the lift prediction technique of a kind of centrifugal pump.
Background technique
Centrifugal pump is widely used in power industry, petrochemical industry, field irrigation, hydraulic engineering and ship as one kind
The rotating machinery of the national economy every field such as oceangoing ship industry, the hot spot always studied both at home and abroad for the research of its sealing device
And difficult point.Impeller port ring and sealing surface cooperation are a kind of common sealing devices, and main function is in limitation impeller operating room
Highly pressurised liquid leaked to impeller inlet or the low-pressure area of impeller center.The presence of choma not only changes centrifugal pump inside stream
The flow regime of body, while also resulting in the volumetric loss inside pump.In addition, leakage stream and impeller inlet master at impeller port ring
The effect disturbed between stream there are one, so that the more disorder of the flow regime of impeller inlet, thus to the whole of centrifugal pump
A performance has an impact.In the actual moving process of centrifugal pump, can be caused due to various impeller port ring with it is close
The abrasion of cover causes gap width between the two to change, and then produces bigger effect to the external characteristic curve of centrifugal pump,
So that original device performance curve can not carry out performance prediction to existing centrifugal pump again.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of lift prediction technique of centrifugal pump, Ke Yitong
It crosses and measures the wearing clearance value between impeller and sealing ring to predict the centrifugal pump lift after wearing occur.
The present invention achieves the above technical objects by the following technical means.
A kind of lift prediction technique of centrifugal pump, includes the following steps:
Determine the centrifugal pump for not occurring wearing initialized gap values δ between impeller and sealing ring0；
Determine gap width δ of the centrifugal pump for occurring wearing between impeller and sealing ring；
According to gap difference DELTA δ and there is the centrifugal pump measured discharge Q worn1, correct raising for the centrifugal pump for occurring wearing
Journey.
Further, by directly measuring or centrifugal pump that wearing does not occur in sensor measurement is between impeller and sealing ring
Initialized gap values δ0；By directly measuring or between sensor measurement the centrifugal pump worn occurs between impeller and sealing ring
Gap value δ.
Further, according to gap difference DELTA δ and there is the centrifugal pump measured discharge Q worn1, correct the centrifugation for occurring wearing
The lift of pump, is specifically determined by following relationship:
In formula:
H is the centrifugal pump after wearing occur in measured discharge Q1Amendment lift under operating condition, m；
K is head coefficient, and value range is 1.2~2；
KaFor gap factor, value range is 0.02~0.05；
Δ δ ' is dimensionless gap difference, specifically:
In formula:
δ is the centrifugal pump seal czermak space value occurred after abrasion, mm；
δ0Not occur the centrifugal pump seal ring initialized gap values worn, mm；
δ1For unit gap, value 1mm；
Q11For measured discharge Q1Standardized value, specifically:
In formula:
Q1To there is the centrifugal pump after abrasion in measured discharge, m3/h；
Q0For metered flow, m3/h；
KbRefer to coefficient for stream, value range is 1~4；
H0Not occur the centrifugal pump worn in metered flow Q0Lift under operating condition, m.
Further, when the specific speed of the centrifugal pump is in 120~350 range, the recommendation of the head coefficient K is
1.53。
Further, when the specific speed of the centrifugal pump is in 120~350 range, the gap factor KaRecommendation be
0.035。
Further, when the specific speed of the centrifugal pump is in 120~350 range, the stream refers to COEFFICIENT KbRecommendation be
2.64。
The beneficial effects of the present invention are:
1. the lift prediction technique of centrifugal pump of the present invention can predict sealing wear occur by correction formula
Centrifugal pump lift.
2. the lift prediction technique of centrifugal pump of the present invention, required parameter are few, it is only necessary to measurement occur wearing from
Heart pump seal clearance can be realized.
3. the lift prediction technique of centrifugal pump of the present invention, when the specific speed of the centrifugal pump is in 120~350 ranges
When, the head curve prediction fitting accuracy of centrifugal pump reaches 95% or more.
Detailed description of the invention
Fig. 1 is the flow chart of the method for pump seal gap wear amount of the present invention.
Fig. 2 is seal clearance schematic diagram of the embodiment of the present invention.
Fig. 3 is the correlation curve of test value of the embodiment of the present invention and calculated value.
In figure:
1- impeller；2- ante-chamber；3- sealing ring.
Specific embodiment
Present invention will be further explained with reference to the attached drawings and specific examples, but protection scope of the present invention is simultaneously
It is without being limited thereto.
As depicted in figs. 1 and 2, the lift prediction technique of centrifugal pump of the present invention, includes the following steps:
Determine the centrifugal pump for not occurring wearing initialized gap values δ between impeller 1 and sealing ring 30；By directly measuring or
Person's sensor measurement does not occur the centrifugal pump worn initialized gap values δ between impeller 1 and sealing ring 30；
Determine gap width δ of the centrifugal pump for occurring wearing between impeller 1 and sealing ring 3；By directly measuring or passing
There is gap width δ of the centrifugal pump worn between impeller 1 and sealing ring 3 in sensor measurement；
According to gap difference DELTA δ and there is the centrifugal pump measured discharge Q worn1, correct raising for the centrifugal pump for occurring wearing
Journey is specifically determined by following relationship:
In formula:
H is the centrifugal pump after wearing occur in measured discharge Q1Amendment lift under operating condition, m；
K is head coefficient, and value range is 1.2~2；
KaFor gap factor, value range is 0.02~0.05；
Δ δ ' is dimensionless gap difference, specifically:
In formula:
δ is the centrifugal pump seal czermak space value occurred after abrasion, mm；
δ0Not occur the centrifugal pump seal ring initialized gap values worn, mm；
δ1For unit gap, value 1mm；
Q11For measured discharge Q1Standardized value, specifically:
In formula:
Q1To there is the centrifugal pump after abrasion in measured discharge, m3/h；
Q0For metered flow, m3/h；
KbRefer to coefficient for stream, value range is 1~4；
H0Not occur the centrifugal pump worn in metered flow Q0Lift under operating condition, m.
When the specific speed of the centrifugal pump is in 120~350 range, the recommendation of the head coefficient K is 1.53, described
Gap factor KaRecommendation be 0.035, the stream refers to COEFFICIENT KbRecommendation be 2.64, the prediction of the head curve of centrifugal pump is quasi-
It closes accuracy and reaches 95% or more.
It is verified below by specific embodiment:
The centrifugal pump that a specific speed is 185.5 is chosen as subjects, when the centrifugal pump abrasion does not occur, In
Metered flow Q0For 250m3Lift H under/h operating condition0For 15m.By directly measuring or wearing do not occur in sensor measurement
Centrifugal pump initialized gap values δ between impeller 1 and sealing ring 30For 0.45mm；By Vehicle Processing impeller 1, by impeller 1 and sealing
Gap is worked into 0.65mm between ring 3.The dimensionless gap difference DELTA δ ' is according to the centrifugation after the appearance abrasion measured
Pump seal czermak space value δ and do not occur the centrifugal pump seal ring initialized gap values δ worn0It is calculated, specifically:
In formula:
δ is the centrifugal pump seal czermak space value occurred after abrasion, mm；
δ0Not occur the centrifugal pump seal ring initialized gap values worn, mm；
δ1For unit gap, value 1mm；
According to gap difference DELTA δ and there is the centrifugal pump measured discharge Q worn1, correct raising for the centrifugal pump for occurring wearing
Journey is specifically determined by following relationship:
In formula:
H is the centrifugal pump after wearing occur in measured discharge Q1For 275m3Amendment lift under/h operating condition, m；
K is head coefficient, value range 1.53；
KaFor gap factor, value range 0.035；
Δ δ ' is 0.2；
Q11For measured discharge Q1For 275m3The standardized value of/h, specifically:
In formula:
Q1To there is the centrifugal pump after abrasion in measured discharge, m3/h；
Q0For metered flow, m3/h；
KbRefer to coefficient, value range 2.64 for stream；
H0For 15m.
Q can be calculated using same method11Amendment lift H corresponding to=0.6~1.2, by with test value
It compares, as shown in table 1 and Fig. 3:
Table 1 calculates lift value compared with testing lift value
| Q11 | 0.6 | 0.8 | 0.9 | 1 | 1.1 | 1.2 |
| Calculate lift value | 18.15 | 16.53 | 15.72 | 14.90 | 14.07 | 13.24 |
| Test lift value | 17.69 | 16.45 | 15.66 | 14.92 | 13.81 | 12.93 |
| Error | - 2.55% | - 0.49% | - 0.35% | 0.17% | - 1.85% | - 2.34% |
By comparison it is found that the error for calculating lift value and test lift value is up to 2.55%, this proves that the present invention is
Reliably.
By choosing head coefficient K, gap factor KaRefer to COEFFICIENT K with streambBoundary value, to verify as the head coefficient K
Recommendation be 1.53, the gap factor KaRecommendation be 0.035, the stream refers to COEFFICIENT KbRecommendation be 2.64, centrifugation
The head curve prediction fitting accuracy of pump reaches 95% or more:
Head coefficient K=1.2, gap factor K are chosen in citing 1a=0.02 and stream refer to COEFFICIENT Kb=1, it acquires such as 2 institute of table
Show:
The calculating lift value of the citing of table 21 is compared with testing lift value
| Q11 | 0.6 | 0.8 | 0.9 | 1 | 1.1 | 1.2 |
| Calculate lift value | 16.16 | 15.55 | 15.25 | 14.94 | 14.63 | 14.33 |
| Test lift value | 17.69 | 16.45 | 15.66 | 14.92 | 13.81 | 12.93 |
| Error | - 8.63% | - 5.46% | - 2.64% | 0.13% | 5.97% | 10.81% |
Head coefficient K=2, gap factor K are chosen in citing 2a=0.05 and stream refer to COEFFICIENT Kb=4, it acquires as shown in table 3:
The calculating lift value of the citing of table 32 is compared with testing lift value
By table 2 and table 3 as can be seen that the head coefficient K is between 1.2~2, the gap factor Ka0.02~
Between 0.05, the stream refers to COEFFICIENT KbBetween 1~4, calculating lift value and testing the worst error of lift value is 18.60%；
As shown in table 1, when the recommendation of the head coefficient K be 1.53, the gap factor KaRecommendation be 0.035, the stream
Refer to COEFFICIENT KbRecommendation be 2.64, calculate lift value and test lift value worst error be 2.55%.I.e. verifying is when described
The recommendation of head coefficient K is 1.53, the gap factor KaRecommendation be 0.035, the stream refers to COEFFICIENT KbRecommendation be
2.64, the head curve prediction fitting accuracy of centrifugal pump reaches 95% or more.
The embodiment is a preferred embodiment of the present invention, but present invention is not limited to the embodiments described above, not
In the case where substantive content of the invention, any conspicuous improvement that those skilled in the art can make, replacement
Or modification all belongs to the scope of protection of the present invention.
Claims (6)
1. a kind of lift prediction technique of centrifugal pump, which comprises the steps of:
Determine the centrifugal pump for not occurring wearing initialized gap values δ between impeller (1) and sealing ring (3)0；
Determine gap width δ of the centrifugal pump for occurring wearing between impeller (1) and sealing ring (3)；
According to gap difference DELTA δ and there is the centrifugal pump measured discharge Q worn1, correct the lift for the centrifugal pump for occurring wearing.
2. the lift prediction technique of centrifugal pump according to claim 1, which is characterized in that by directly measuring or sensing
The centrifugal pump that wearing does not occur in device measurement initialized gap values δ between impeller (1) and sealing ring (3)0；By directly measuring or
There is gap width δ of the centrifugal pump worn between impeller (1) and sealing ring (3) in sensor measurement.
3. the lift prediction technique of centrifugal pump according to claim 1, which is characterized in that according to gap difference DELTA δ and go out
The centrifugal pump measured discharge Q now worn1, the lift for the centrifugal pump for occurring wearing is corrected, is specifically determined by following relationship:
In formula:
H is the centrifugal pump after wearing occur in measured discharge Q1Amendment lift under operating condition, m；
K is head coefficient, and value range is 1.2~2；
KaFor gap factor, value range is 0.02~0.05；
Δ δ ' is dimensionless gap difference, specifically:
In formula:
δ is the centrifugal pump seal czermak space value occurred after abrasion, mm；
δ0Not occur the centrifugal pump seal ring initialized gap values worn, mm；
δ1For unit gap, value 1mm；
Q11For measured discharge Q1Standardized value, specifically:
In formula:
Q1To there is the centrifugal pump after abrasion in measured discharge, m3/h；
Q0For metered flow, m3/h；
KbRefer to coefficient for stream, value range is 1~4；
H0Not occur the centrifugal pump worn in metered flow Q0Lift under operating condition, m.
4. the lift prediction technique of centrifugal pump according to claim 3, which is characterized in that when the specific speed of the centrifugal pump
In 120~350 range, the recommendation of the head coefficient K is 1.53.
5. the lift prediction technique of centrifugal pump according to claim 3, which is characterized in that when the specific speed of the centrifugal pump
In 120~350 range, the gap factor KaRecommendation be 0.035.
6. the lift prediction technique of centrifugal pump according to claim 3, which is characterized in that when the specific speed of the centrifugal pump
In 120~350 range, the stream refers to COEFFICIENT KbRecommendation be 2.64.
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| CN201910623409.1A CN110425153B (en) | 2019-07-11 | 2019-07-11 | Centrifugal pump lift prediction method |
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|---|---|---|---|
| CN201910623409.1A CN110425153B (en) | 2019-07-11 | 2019-07-11 | Centrifugal pump lift prediction method |
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| CN110425153B CN110425153B (en) | 2020-07-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637068A (en) * | 2019-07-11 | 2020-09-08 | 江苏大学 | Method for monitoring clearance of sealing ring on line |
Citations (5)
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|---|---|---|---|---|
| US5924851A (en) * | 1995-12-08 | 1999-07-20 | Aisan Kogyo Kabushiki Kaisha | Magnetically coupled pump having a back-up radical sliding surface on the shaft |
| CN101813101A (en) * | 2010-03-19 | 2010-08-25 | 江苏大学 | Anti-abrasion device of sealing opening ring of solid-liquid two-phase flow centrifugal pump |
| CN105114334A (en) * | 2015-07-27 | 2015-12-02 | 北京化工大学 | Method for monitoring abrasion loss of impeller wear ring of multi-stage centrifugal pump based on computational fluid dynamics theory |
| CN106050687A (en) * | 2016-08-09 | 2016-10-26 | 万毅 | Abrasion characteristic analysis and optimization method for impeller type water pump |
| CN207905866U (en) * | 2018-02-07 | 2018-09-25 | 浙江核芯泵业有限公司 | A kind of impeller ring that abrasion resistant effect is good |
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2019
- 2019-07-11 CN CN201910623409.1A patent/CN110425153B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5924851A (en) * | 1995-12-08 | 1999-07-20 | Aisan Kogyo Kabushiki Kaisha | Magnetically coupled pump having a back-up radical sliding surface on the shaft |
| CN101813101A (en) * | 2010-03-19 | 2010-08-25 | 江苏大学 | Anti-abrasion device of sealing opening ring of solid-liquid two-phase flow centrifugal pump |
| CN105114334A (en) * | 2015-07-27 | 2015-12-02 | 北京化工大学 | Method for monitoring abrasion loss of impeller wear ring of multi-stage centrifugal pump based on computational fluid dynamics theory |
| CN106050687A (en) * | 2016-08-09 | 2016-10-26 | 万毅 | Abrasion characteristic analysis and optimization method for impeller type water pump |
| CN207905866U (en) * | 2018-02-07 | 2018-09-25 | 浙江核芯泵业有限公司 | A kind of impeller ring that abrasion resistant effect is good |
Non-Patent Citations (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637068A (en) * | 2019-07-11 | 2020-09-08 | 江苏大学 | Method for monitoring clearance of sealing ring on line |
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