CN110705130A - Water pump model selection method for low-lift pump device of large pump station - Google Patents
Water pump model selection method for low-lift pump device of large pump station Download PDFInfo
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- CN110705130A CN110705130A CN201911049077.7A CN201911049077A CN110705130A CN 110705130 A CN110705130 A CN 110705130A CN 201911049077 A CN201911049077 A CN 201911049077A CN 110705130 A CN110705130 A CN 110705130A
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- 238000010187 selection method Methods 0.000 title claims abstract description 18
- 238000005086 pumping Methods 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
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- 238000000034 method Methods 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 2
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Abstract
The invention discloses a water pump model selection method of a low-lift pump device of a large-scale pump station, belongs to the technical field of hydraulic engineering and fluid mechanical engineering, and is scientific in model selection method and clear in principle0The pump lift H is characterized in that the flow Q of a single water pump is obtained by selecting the number Z of units of 2-3 schemes, the specific revolution number close to that of an excellent pump device is obtained by adjusting the nD value, the revolution speed n of the water pump and the diameter D of a water pump impeller are determined, the most critical design of the nD value of the water pump and the specific revolution number of the pump device are quantized through a pump device model test database, the water pump type selection process is stylized, the optimized type selection of the water pump device is rapidly realized, the type selection efficiency is improved, and the type selection quality is improved.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering and fluid mechanical engineering, relates to a model selection method of a pump device, and particularly relates to a water pump model selection method of a low-lift pump device of a large pump station.
Background
Under the condition that the design flow and the lift of a pump station are known, the design of a large-scale pump station aims to determine the type of a pump device, the diameter of a pump unit table sleeve, the diameter of a pump impeller and the rotating speed of the pump, and a water pump hydraulic model is optimized to ensure the safe, stable and efficient operation of the pump unit. Due to the fact that more parameters need to be considered, an effective type selection technology and method cannot be formed so far. Often according to experience, the trial and error method is adopted for comparison and selection, and the working efficiency is very low. The water inlet and outlet flow passage loss of the low-lift pump station accounts for a large proportion of the net lift, theoretical calculation is difficult to carry out, and the pump lift is checked through equal flow and hydraulic loss, so that the pump device is not guaranteed to work in a high-efficiency area theoretically. The design quality can not be guaranteed in the existing pump station design model selection process, the unit operation efficiency is low, and potential safety hazards are easy to occur. Therefore, in view of the above situation, it is necessary to design a model selection method for a low-lift pump device of a large pumping station.
Disclosure of Invention
The invention aims to overcome the defects in the existing pump station design model selection process, and provides a model selection method for a large-scale pump station low-lift pump device.
The technical scheme of the invention is as follows: a water pump model selection method for a low-lift pump device of a large pump station is characterized by comprising the following specific steps:
(1) designing flow Q according to known pump station0And a head H;
(2) by the number of units Z, from the formula
Wherein Q is the single-machine flow of the water pump; q0Designing total flow for a pump station; z is the number of the units, and the single-unit flow Q of the water pump is obtained;
(3) substituting nD value into formula by initially selecting nD value
Wherein n is11Is the unit rotating speed of the water pump; h is the pump station lift to obtain the unit rotating speed n of the water pump11；
(4) By means of water pumpsUnit speed of rotation n11From a simplified linear relationship, the specific speed n of the pump devices＝3.2364n11-306.9；
(5) Judging whether the specific revolution of the pump device in the step (4) has a corresponding excellent hydraulic model;
(6) if the judgment result in the step (5) has an excellent hydraulic model corresponding to the judgment result, calculating the rotating speed n of the water pump and the diameter D of the impeller of the water pump by the following two formulas respectively;
wherein n is the rotating speed of the water pump; n issThe specific revolution of the pump device; h is the pump station lift; q is the flow rate of a single water pump,
wherein n is11Is the unit rotating speed of the water pump; h is the pump station lift; n is the rotating speed of the water pump;
(7) judging whether n in the step (6) accords with the rotating speed of the corresponding motor, and if so, selecting the scheme;
(8) if the judgment result in the step (5) does not accord with the excellent hydraulic model, entering the step (3) until the excellent hydraulic model corresponding to the nD value is found by adjusting the nD value; and (4) if the n in the step (7) does not correspond to the motor rotating speed, the step (3) is carried out again.
And (3) calculating the single machine flow Q of the water pump according to the number Z of different units in the step (2) and not less than 3 schemes.
And (4) the nD value range in the step (3) is 280-435.
And (6) the rotating speed n corresponds to the power machine and reducer transformation ratio, and the number of the selected rotating speed schemes is not less than 2.
The invention has the beneficial effects that: the water pump type selection method for the low-lift pump device of the large pump station, provided by the invention, is scientific in type selection method and clear in principle, and the flow Q is designed through the known pump station0The lift H is obtained by selecting the number Z of the units of 2-3 schemesThe pump single machine flow Q obtains the specific revolution number close to the excellent pump device by adjusting the nD value, thereby determining the rotating speed n of the pump and the diameter D of the impeller of the pump, and rapidly realizing the optimization and model selection of the pump device by adjusting the number of units and the nD value through the quantitative relation between the specific revolution number and the nD value and the model selection efficiency, and improving the model selection quality.
Drawings
FIG. 1 is a schematic diagram of the type selection process of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1, a water pump model selection method for a low-lift pump device of a large pump station specifically comprises the following steps:
(1) designing flow Q according to known pump station0And a head H;
(2) by the number of units Z, from the formula
Wherein Q is the single-machine flow of the water pump; q0Designing total flow for a pump station; z is the number of the units, and the single-unit flow Q of the water pump is obtained;
(3) substituting nD value into formula by initially selecting nD value
Wherein n is11Is the unit rotating speed of the water pump; h is the pump station lift to obtain the unit rotating speed n of the water pump11；
(4) By unit speed n of the water pump11From a simplified linear relationship, the specific speed n of the pump devices＝3.2364n11-306.9；
(5) Judging whether the specific revolution of the pump device in the step (4) has a corresponding excellent hydraulic model;
(6) if the judgment result in the step (5) has an excellent hydraulic model corresponding to the judgment result, calculating the rotating speed n of the water pump and the diameter D of the impeller of the water pump by the following two formulas respectively;
wherein n is the rotating speed of the water pump; n issThe specific revolution of the pump device; h is the pump station lift; q is the flow rate of a single water pump,
wherein n is11Is the unit rotating speed of the water pump; h is the pump station lift; n is the rotating speed of the water pump;
(7) judging whether n in the step (6) accords with the rotating speed of the corresponding motor, and if so, selecting the scheme;
(8) if the judgment result in the step (5) does not accord with the excellent hydraulic model, entering the step (3) until the excellent hydraulic model corresponding to the nD value is found by adjusting the nD value; and (4) if the n in the step (7) does not correspond to the motor rotating speed, the step (3) is carried out again.
As shown in fig. 1, the model selection principle of the water pump model selection method for the low-lift pump device of the large pump station is as follows:
the model selection method is based on big data, various pump device model test results formed by excellent water pump hydraulic models are collected, and the specific revolution basically realizes the full coverage of a low-lift range. By using the pump device model test result, the calculation of the hydraulic loss of the water inlet and outlet flow channel with low precision is avoided, and the reliability of the performance of the pump device is effectively improved.
Obtaining the pump device lift coefficient psi and the pump device specific revolution n through data analysissCan be regressed into phi 13285ns -1.407Due to the lift coefficient psi and unit speed n11Are respectively as
The specific revolution of the pump unit is expressed as a relation with the unit revolution
ns＝0.6456n11 1.3732
Reduced to linear relationship to obtain
ns＝3.2364n11-306.9
Since the head H is known, by giving the value nD, the specific number of revolutions n of the pump device can be obtainedsThe selection of the pump device type and the hydraulic model of the water pump is also determined. The flow Q of the water pump set is known according to the specific revolution
The rotating speed n of the water pump can be obtained, so that the diameter D of the impeller of the water pump is determined, and finally the model selection of the water pump is realized.
Claims (4)
1. A water pump model selection method for a low-lift pump device of a large pump station is characterized by comprising the following specific steps:
(1) designing flow Q according to known pump station0And a head H;
(2) by the number of units Z, from the formula
Wherein Q is the single-machine flow of the water pump; q0Designing total flow for a pump station; z is the number of the units, and the single-unit flow Q of the water pump is obtained;
(3) substituting nD value into formula by initially selecting nD value
Wherein n is11Is the unit rotating speed of the water pump; h is the pump station lift to obtain the unit rotating speed n of the water pump11；
(4) By unit speed n of the water pump11From a simplified linear relationship, the specific speed n of the pump devices＝3.2364n11-306.9；
(5) Judging whether the specific revolution of the pump device in the step (4) has a corresponding excellent hydraulic model;
(6) if the judgment result in the step (5) has an excellent hydraulic model corresponding to the judgment result, calculating the rotating speed n of the water pump and the diameter D of the impeller of the water pump by the following two formulas respectively;
wherein n is the rotating speed of the water pump; n issThe specific revolution of the pump device; h is the pump station lift; q is the flow rate of a single water pump,
wherein n is11Is the unit rotating speed of the water pump; h is the pump station lift; n is the rotating speed of the water pump;
(7) judging whether n in the step (6) accords with the rotating speed of the corresponding motor, and if so, selecting the scheme;
(8) if the judgment result in the step (5) does not accord with the excellent hydraulic model, entering the step (3) until the excellent hydraulic model corresponding to the nD value is found by adjusting the nD value; and (4) if the n in the step (7) does not correspond to the motor rotating speed, the step (3) is carried out again.
2. The model selection method for the low-lift pump device of the large pumping station according to claim 1, characterized in that: and (3) calculating the single machine flow Q of the water pump according to the number Z of different units in the step (2) and not less than 3 schemes.
3. The model selection method for the low-lift pump device of the large pumping station according to claim 1, characterized in that: and (4) the nD value range in the step (3) is 280-435.
4. The model selection method for the low-lift pump device of the large pumping station according to claim 1, characterized in that: and (6) the rotating speed n corresponds to the power machine and reducer transformation ratio, and the number of the selected rotating speed schemes is not less than 2.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111708815A (en) * | 2020-05-11 | 2020-09-25 | 中国石油集团工程股份有限公司 | Pump model selection and analysis technology based on big data algorithm |
| CN113656969A (en) * | 2021-08-18 | 2021-11-16 | 中铁二院华东勘察设计有限责任公司 | Water pump model selection method suitable for track bed pump station in underground section of rail transit |
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| CN104989653A (en) * | 2015-05-25 | 2015-10-21 | 扬州大学 | Water pump selection method for low-lift pump unit based on impeller nominal average flow speed |
| CN105631192A (en) * | 2015-12-21 | 2016-06-01 | 扬州大学 | Comprehensive weighted evaluation method of pump unit energy consumption |
| KR20170120330A (en) * | 2016-04-21 | 2017-10-31 | 송경희 | Flow rate calculation method incident to rotation velocity and head-setting in water supply pressurizing booster pump system |
| KR101870564B1 (en) * | 2017-03-14 | 2018-06-22 | (주) 인정테크 | Frequency control method by to variable pressure according flow rate allowed pipe friction head loss at feed pump |
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- 2019-10-31 CN CN201911049077.7A patent/CN110705130B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989653A (en) * | 2015-05-25 | 2015-10-21 | 扬州大学 | Water pump selection method for low-lift pump unit based on impeller nominal average flow speed |
| CN105631192A (en) * | 2015-12-21 | 2016-06-01 | 扬州大学 | Comprehensive weighted evaluation method of pump unit energy consumption |
| KR20170120330A (en) * | 2016-04-21 | 2017-10-31 | 송경희 | Flow rate calculation method incident to rotation velocity and head-setting in water supply pressurizing booster pump system |
| KR101870564B1 (en) * | 2017-03-14 | 2018-06-22 | (주) 인정테크 | Frequency control method by to variable pressure according flow rate allowed pipe friction head loss at feed pump |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111708815A (en) * | 2020-05-11 | 2020-09-25 | 中国石油集团工程股份有限公司 | Pump model selection and analysis technology based on big data algorithm |
| CN111708815B (en) * | 2020-05-11 | 2023-04-18 | 中国石油集团工程股份有限公司 | Pump model selection and analysis method based on big data algorithm |
| CN113656969A (en) * | 2021-08-18 | 2021-11-16 | 中铁二院华东勘察设计有限责任公司 | Water pump model selection method suitable for track bed pump station in underground section of rail transit |
| CN113656969B (en) * | 2021-08-18 | 2023-09-08 | 中铁二院华东勘察设计有限责任公司 | Water pump type selection method suitable for track traffic underground section ballast bed pump station |
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