CN114017303A - Variable-frequency capacity-increasing control method of water pump - Google Patents
Variable-frequency capacity-increasing control method of water pump Download PDFInfo
- Publication number
- CN114017303A CN114017303A CN202111322927.3A CN202111322927A CN114017303A CN 114017303 A CN114017303 A CN 114017303A CN 202111322927 A CN202111322927 A CN 202111322927A CN 114017303 A CN114017303 A CN 114017303A
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- China
- Prior art keywords
- water pump
- rotating speed
- lift
- upper limit
- control method
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000012417 linear regression Methods 0.000 claims abstract description 9
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004548 suspo-emulsion Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/08—Cooling; Heating; Preventing freezing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a variable-frequency capacity-increasing control method of a water pump, which comprises the following steps of: s1, according to the set output power POutput ofStarting the water pump, recording the flow and temperature rise T of the water pump under different lifts1Ambient temperature T2And the actual power P of the water pump is obtained by calculation according to the lift and the flowPractice of(ii) a S2, establishing a binary linear regression equation PPractice of=A×T1+B×T2+ C; s3, selecting the upper limit of the lift of the water pump during workingAnd the ambient temperature is slightly higher than or equal to the rotating speed corresponding to the upper limit of the lift, so that the water pump works at a constant rotating speed. When the pump is used, the upper limit of the lift is limited according to a binary linear regression equation, so that the water pump works at a constant rotating speed, and compared with a constant-power variable pump, the upper limit of the flow of the constant-power variable pump is broken through in an interval of being lower than the upper limit of the limited lift, the fluid conveying efficiency of the water pump is improved, the output power and the voltage of the water pump are changed to stabilize the rotating speed, and the flow of fluid is increased.
Description
Technical Field
The invention relates to a submersible pump, in particular to a variable-frequency capacity-increasing control method of a water pump.
Background
Water pumps are machines that deliver or pressurize a liquid. It transfers the mechanical energy of prime mover or other external energy to liquid to increase the energy of liquid, and is mainly used to transfer liquid including water, oil, acid-base liquid, emulsion, suspoemulsion and liquid metal.
The existing constant-power variable pump fully utilizes the power of the motor when guaranteeing that the motor cannot exceed the power, has large flow at low pressure and small flow at high pressure, breaks through the upper limit of the flow compared with a constant-pressure pump before reaching the limited power, and improves the transport efficiency of the water pump to fluid. Because of the influence of the ambient temperature and the water pump temperature rise, when the sum of the ambient temperature and the water pump temperature rise is too high, the resistance of the motor is increased, the useless work of the water pump is gradually increased, and the actual power output is reduced, so that the output power of the constant-power variable pump is limited, and the upper limit of the flow of the water pump is limited. Therefore, a variable-frequency capacity-increasing control method for a water pump capable of increasing the upper limit of the flow rate of the water pump is needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a variable-frequency capacity-increasing control method of a water pump, which can improve the upper limit of the flow of the water pump.
The purpose of the invention is realized by adopting the following technical scheme:
a frequency conversion capacity-increasing control method of a water pump comprises the following steps:
s1, according to the set output power POutput ofStarting the water pump, recording the flow and temperature rise T of the water pump under different lifts1Ambient temperature T2And the actual power P of the water pump is obtained by calculation according to the lift and the flowPractice of；
S2, establishing a binary linear regression equation PPractice of＝A×T1+B×T2+ C, A, B and C are constants;
s3, selecting the upper lift limit and the environment temperature when the water pump works, and making the water pump work at a constant rotating speed at a rotating speed slightly larger than or equal to the rotating speed corresponding to the upper lift limit.
Preferably, the motor of the water pump is a water-cooling motor, and a rotating shaft of the motor is positioned in the water-cooling channel.
Through in time dispelling the heat to the motor, slow down the temperature rise when the water pump uses, avoid the water pump temperature rise too fast, too high, influence the normal use of water pump.
Preferably, the upper temperature limit T of the water pumpmaxIs 85 ℃; t ismax≥T1+T2。
By controlling the ambient temperature T2And temperature rise T1The sum of the temperature and the temperature of the water pump is not more than the upper limit of the temperature of the water pump, so that the water pump can work within the safe temperature use range
Preferably, the upper limit of the lift of the water pump is 20-40 m.
In step S3, the rotation speed of the water pump during constant rotation speed operation is equal to the rotation speed corresponding to the upper limit of the head.
When the rotating speed of the water pump working at constant rotating speed is equal to the rotating speed corresponding to the upper limit of the lift, different output power P is obtainedOutput ofAll have a binary linear regression equation P corresponding theretoPractice of＝A×T1+B×T2+ C, ambient temperature T, without exceeding the upper lift limit2And temperature rise T1The sum of the water temperature and the water temperature is not more than the working temperature of the upper limit of the lift, and the water pump can normally work under the upper limit of the lift, namely, the environmental temperature T is ensured2And temperature rise T1The sum is within the normal operating temperature range of the water pump.
Compared with the prior art, the invention has the beneficial effects that:
by establishing different output powers POutput ofAnd ambient temperature T2Temperature rise T1When the binary linear regression equation is used, the upper limit of the lift is limited according to the binary linear regression equation, so that the water pump works at a constant rotating speed, and compared with a constant-power variable pump, the upper limit of the flow of the constant-power variable pump is broken through in an interval of being lower than the upper limit of the limited lift, the fluid conveying efficiency of the water pump is improved, the output power and the voltage of the water pump are changed to stabilize the rotating speed, and the flow of the fluid is increased.
Drawings
Fig. 1 is a graph of water pump head-flow rate in an embodiment.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, belong to the protection scope of the present invention.
A frequency conversion capacity-increasing control method of a water pump comprises the following steps:
s1, starting the water pump according to different set output powers, wherein the transported fluid is water, and recording the flow and temperature rise T of the water pump under different lifts1Ambient temperature T2And the actual power P of the water pump is obtained by calculation according to the lift and the flowPractice of；
S2, establishing a binary linear regression equation PPractice of＝A×T1+B×T2+ C, A, B and C may be based on multiple sets of PPractice of、T1And T2Calculated, A, B and C are constants;
s3, selecting the upper limit of the lift of the water pump when the water pump works as 40m and the ambient temperature as 25 ℃, and selecting POutput ofA binary linear regression equation of 1400W, the flow rate is 4.94m when the head is 40m3The rotating speed is 4650r/min, and the impeller set of the water pump is a 6T impeller set; the water pump is driven to work at a constant rotating speed of 4650r/min, and the flow of the water pump is tested under different lifts. Taking P additionallyOutput ofHead, flow and speed data of 1250W, 1400W, respectively, the results are shown in table 1.
TABLE 1 data table of lift, flow and rotation speed of constant-speed water pump and constant-output water pump
The head-flow curve is plotted against the database of table 1, with head on the abscissa and flow on the ordinate, and the results are shown in fig. 1.
As can be seen from FIG. 1, in the interval of the head less than 40m, the flow rate of the water pump with the constant rotating speed of 4650r/min is high, and the conveying capacity of the fluid is high.
The motor of the water pump is a water-cooling motor, and a rotating shaft of the motor is positioned in the water-cooling channel.
Upper temperature limit T of water pumpmaxIs 85 ℃; t ismax≥T1+T2。
The above embodiments are only some of the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (5)
1. A frequency conversion capacity-increasing control method of a water pump is characterized by comprising the following steps:
s1, according to the set output power POutput ofStarting the water pump, recording the flow and temperature rise T of the water pump under different lifts1Ambient temperature T2And the actual power P of the water pump is obtained by calculation according to the lift and the flowPractice of；
S2, establishing a binary linear regression equation PPractice of=A×T1+B×T2+ C, A, B and C are constants;
and S3, selecting the upper lift limit and the ambient temperature of the water pump during working, and enabling the water pump to work at a constant rotating speed at a rotating speed slightly larger than or equal to the rotating speed corresponding to the upper lift limit.
2. The frequency conversion capacity-increasing control method of the water pump according to claim 1, wherein a motor of the water pump is a water-cooling motor, and a rotating shaft of the motor is positioned in the water-cooling channel.
3. The variable-frequency capacity-increasing control method of the water pump according to claim 1, wherein the upper temperature limit T of the water pumpmaxIs 85 ℃; t ismax≥ T1+T2。
4. The variable-frequency capacity-increasing control method of the water pump according to claim 1, wherein the upper limit of the head of the water pump is 20-40 m.
5. The variable-frequency capacity-increasing control method of the water pump according to claim 1, wherein in the step S3, the rotating speed of the water pump during constant-rotating-speed operation is equal to the rotating speed corresponding to the upper limit of the head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111322927.3A CN114017303B (en) | 2021-11-09 | 2021-11-09 | Variable-frequency capacity-increasing control method for water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111322927.3A CN114017303B (en) | 2021-11-09 | 2021-11-09 | Variable-frequency capacity-increasing control method for water pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114017303A true CN114017303A (en) | 2022-02-08 |
| CN114017303B CN114017303B (en) | 2024-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111322927.3A Active CN114017303B (en) | 2021-11-09 | 2021-11-09 | Variable-frequency capacity-increasing control method for water pump |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140356212A1 (en) * | 2013-05-29 | 2014-12-04 | GM Global Technology Operations LLC | Transmission fluid pump speed control systems and methods |
| KR101790874B1 (en) * | 2016-04-26 | 2017-10-26 | 주식회사 대영파워펌프 | Pump consumption power calculation method at revolution per minute in inverter controlled water supply pump |
| CN109185972A (en) * | 2018-09-11 | 2019-01-11 | 哈尔滨顺易天翔热力技术开发有限公司 | Thermal substation circulating pump optimal regulation method |
| CN110454373A (en) * | 2019-08-20 | 2019-11-15 | 华能国际电力股份有限公司 | Optimized operation method for variable frequency pump of seawater direct-current cooling water system |
| CN212535964U (en) * | 2020-03-19 | 2021-02-12 | 佛山市沃联电气有限公司 | Constant pressure pump |
| CN112580183A (en) * | 2019-09-30 | 2021-03-30 | 北京大学 | Method for accurately controlling real-time flow of online learning water pump model |
-
2021
- 2021-11-09 CN CN202111322927.3A patent/CN114017303B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140356212A1 (en) * | 2013-05-29 | 2014-12-04 | GM Global Technology Operations LLC | Transmission fluid pump speed control systems and methods |
| KR101790874B1 (en) * | 2016-04-26 | 2017-10-26 | 주식회사 대영파워펌프 | Pump consumption power calculation method at revolution per minute in inverter controlled water supply pump |
| CN109185972A (en) * | 2018-09-11 | 2019-01-11 | 哈尔滨顺易天翔热力技术开发有限公司 | Thermal substation circulating pump optimal regulation method |
| CN110454373A (en) * | 2019-08-20 | 2019-11-15 | 华能国际电力股份有限公司 | Optimized operation method for variable frequency pump of seawater direct-current cooling water system |
| CN112580183A (en) * | 2019-09-30 | 2021-03-30 | 北京大学 | Method for accurately controlling real-time flow of online learning water pump model |
| CN212535964U (en) * | 2020-03-19 | 2021-02-12 | 佛山市沃联电气有限公司 | Constant pressure pump |
Non-Patent Citations (1)
| Title |
|---|
| 张世庆;丁飞;张西良;杨志宝;: "SOFIM水泵性能试验台的设计与应用", 中国农村水利水电, no. 12, 15 December 2007 (2007-12-15), pages 45 - 48 * |
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| CN114017303B (en) | 2024-08-16 |
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