CN103244396B - The determination of the efficient parallel pumps of secondary water-supply full flow and progress control method - Google Patents
The determination of the efficient parallel pumps of secondary water-supply full flow and progress control method Download PDFInfo
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- CN103244396B CN103244396B CN201310166811.4A CN201310166811A CN103244396B CN 103244396 B CN103244396 B CN 103244396B CN 201310166811 A CN201310166811 A CN 201310166811A CN 103244396 B CN103244396 B CN 103244396B
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- flow
- general pump
- variable frequency
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Abstract
The invention discloses determination and the progress control method of the efficient parallel pumps of a kind of secondary water-supply full flow, comprise the defining method of parallel pumps and the progress control method of parallel pumps; The defining method of parallel pumps comprises the following steps: the lift one) determined according to the highest intraday effect and the reference design water pressure of water system determines a variable frequency pump; Two) n is determined according to set of equation
1the little general pump of platform and n
2the large general pump of platform; The progress control method of parallel pumps: according to current water consumption, realizes variable frequency pump by the switching gradually of little general pump and large general pump and runs in higher efficiency range.The present invention scientifically determines the model of variable frequency pump and the model of each general pump and number of units, and propose the control point of pump group switching, instrument size is appropriately suitable for, there is reliable water supply security, the requirement of the full-time flow-quantity high-efficiency of system water supply can be met, reach the object of energy-saving and frequency-variable consumption reduction, the Automation Design that simultaneously can also control for pump group provides advisory opinion.
Description
Technical field
The present invention relates to a kind of parallel pumps for secondary water-supply, particularly relate to determination and the progress control method of the efficient parallel pumps of a kind of secondary water-supply full flow.
Background technique
At present in tall building secondary water-supply field, many employing frequency modulation water supply modes, early stage frequency modulation water supply product is made up of same model pump, wherein a pump frequency conversion, all the other pump power frequencies.When flow is less, a pump speed governing operation, along with the increase of flow, general pump progressively puts into operation.The shortcoming of this kind equipment is the time length of water pump darg in higher efficiency range, and during low flow rate condition, pump efficiency can drop to less than 30%, thus not only can cause the waste of the energy but also can shorten working life of water pump.Along with the progress in epoch, variable-frequency control pump group is developed to Multiple Type by single model, occurs that the modified model Of Frequency Conversion And Timing Water-Supplying Equipment of little pump joined by large pump.Improved equipment is often not suitable for because the frequency control of motor speed Type of pump selected too much causes actual motion to switch loaded down with trivial details or frequency control of motor speed Type of pump, within the scope of whole design second flow, there will be multistage fallback district, make variable-frequency speed-adjusting energy-saving effect can not get good embodiment.
Summary of the invention
The present invention provides determination and the progress control method of the efficient parallel pumps of a kind of secondary water-supply full flow for solving in known technology the technical problem that exists, the secondary water-supply parallel pumps of the method is adopted to have reliable water supply security, the requirement of the full-time flow-quantity high-efficiency of system water supply can be met, reach the object of energy-saving and frequency-variable consumption reduction, the Automation Design that simultaneously can also control for pump group provides advisory opinion.
The technological scheme that the present invention takes for the technical problem existed in solution known technology is: the determination of the efficient parallel pumps of a kind of secondary water-supply full flow and progress control method, comprise the defining method of parallel pumps and the progress control method of parallel pumps; The defining method of described parallel pumps comprises the following steps:
One) lift determined according to the highest intraday effect and the reference design water pressure of water system determines a variable frequency pump;
Two) n is determined according to following set of equation
1the little general pump of platform and n
2the large general pump of platform:
In formula: q
1-variable frequency pump efficient operating regime high order end flow (m
3/ h);
Q
2-variable frequency pump efficient operating regime low order end flow (m
3/ h);
Q
a-little general pump rated flow (m
3/ h);
Q
b-large general pump rated flow (m
3/ h);
N
1-little general pump number of units;
N
2-large general pump number of units;
Q
design-design second flow;
The progress control method of described parallel pumps: according to current water consumption, realize variable frequency pump by the switching gradually of little general pump and large general pump and run in higher efficiency range, switching point is determined according to following formula:
Q
current=AQ
a+ BQ
b+ q
1, 0≤A≤n
1, 0≤B≤n
2-1
In formula: Q
current-current water flow (m
3/ h);
A-for switching the number of units of little general pump;
B-for switching the number of units of large general pump;
Within the scope of design second flow, when current water flow meets the combination of above-mentioned formula, pump group should switch.
The advantage that the present invention has and good effect are: utilize variable frequency pump working principle, in conjunction with the actual used water amount feature that proportion is large when height is per day, scientifically determine the model of variable frequency pump and the model of each general pump and number of units, and propose the control point of pump group switching, instrument size is appropriately suitable for, there is reliable water supply security, the requirement of the full-time flow-quantity high-efficiency of system water supply can be met, reach the object of energy-saving and frequency-variable consumption reduction, the Automation Design that simultaneously can also control for pump group provides advisory opinion.
Accompanying drawing explanation
Fig. 1 is the model schematic applying water system of the present invention;
Fig. 2 is the changes in flow rate schematic diagram applying water system of the present invention;
Fig. 3 is the skeleton diagram that application the present invention runs control section.
Embodiment
For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
The determination of the efficient parallel pumps of secondary water-supply full flow and a progress control method, comprise the defining method of parallel pumps and the progress control method of parallel pumps;
The defining method of described parallel pumps comprises the following steps:
One) lift determined according to the highest intraday effect and the reference design water pressure of water system determines the model of a variable frequency pump; The highest intraday effect arranges standard according to house classification and sanitary ware, in conjunction with the highest civil water quota, can solve, the highest intraday effect solve employing prior art, do not repeat them here.
Two) n is determined according to following set of equation
1the little general pump of platform and n
2the large general pump of platform:
In formula: q
1-variable frequency pump efficient operating regime high order end flow (m
3/ h);
Q
2-variable frequency pump efficient operating regime low order end flow (m
3/ h);
Q
a-little general pump rated flow (m
3/ h);
Q
b-large general pump rated flow (m
3/ h);
N
1-little general pump number of units;
N
2-large general pump number of units;
Q
design-design second flow;
By the model determination variable frequency pump efficient operating regime high order end flow q of described variable frequency pump
1with low order end flow q
2, and standard is set according to house classification and sanitary ware solves design second flow q
design, then according to the model of the large and small general pump of above-mentioned equations and number of units.
The progress control method of described parallel pumps: according to current water consumption, realize variable frequency pump by the switching gradually of little general pump and large general pump and run in higher efficiency range, switching point is determined according to following formula:
Q
current=AQ
a+ BQ
b+ q
1, 0≤A≤n
1, 0≤B≤n
2-1 (2)
In formula: Q
current-current water flow (m
3/ h);
A-for switching the number of units of little general pump;
B-for switching the number of units of large general pump;
Within the scope of design second flow, when current water flow meets the combination of above-mentioned formula, pump group should switch.
During small flow, variable frequency pump puts into operation, and along with the increase of flow, a little general pump puts into operation, flow continues to increase, second little general pump puts into operation, and when flowing exceed certain value, little general pump is all stopped transport, a large general pump puts into operation, if flow continues to increase, a little general pump puts into operation again, by that analogy, multiple stage general pump switches gradually, all can meet the requirement of design second flow when large general pump and variable frequency pump parallel running.In whole service process, variable frequency pump all operates in higher efficiency range.
Application example of the present invention:
Refer to Fig. 1, according to " Code for design of building water supply and sewerage ", standard is set according to house classification, sanitary ware, in conjunction with the highest civil water quota, solve the design second flow q of certain secondary water supply system
designfor 27.7L/s(100m
3/ h), high intraday effect Q
on averagefor 13m
3/ h, water system constant voltage value H is 70m, from meeting pressure of supply water, variable frequency pump q
1for 6m
3/ h, q
2for 16m
3/ h.By q
design, q
1, q
2substitute in formula (1) and solve, that is:
: Q
a=10m
3/ h; Q
b=28m
3/ h; n
1=2; n
2=4, each lift of pump is that 70m determines with reference to design water pressure H.In the present embodiment, water system selects a variable frequency pump 1, two little general pumps 2 of same model, 3, four large general pumps 4 of same model, 5, 6, 7, wherein large general pump 7 is stand by pump, above-mentioned water system is a kind of Frequency conversion speed adjusting, during system works, pump group is drawn water to user 14 from pond 8 and is supplied water, pressure transducer 9 continuous acquisition pump group discharge pressure, and the intelligent controller 11 pressure signal fed back in control cabinet 10, if actual pressure and setting pressure are not inconsistent, intelligent controller 11 sends instruction according to change value of pressure, control frequency variator 12 and general pump controller 13 work, thus control variable frequency pump 1 and little general pump 2, 3, large general pump 4, 5, 6, 7 mutual switchings make system pipe network internal pressure remain on pressure set points.
Refer to Fig. 2, the progress control method of pump group:
Fig. 2 is above-mentioned secondary water supply system changes in flow rate schematic diagram, from 0 to q
designeach flow all may occur, by the Effec-tive Function of the full-time flow of combination control realization of single variable frequency pump and various general pump, in Fig. 2, often the range of flow of two several of row is the efficient active section of pump group, wherein general pump runs under rated flow, and variable frequency pump runs in efficient operating regime flow.In conjunction with formula (2), A, B valued combinations situation may be: 1. A=0, B=0; 2. A=1, B=0; 3. A=2, B=0; 4. A=0, B=1; 5. A=1, B=1; 6. A=2, B=1; 7. A=0, B=2; 8. A=1, B=2; 9. A=2, B=2; 10. A=0, B=3.Flow changes along shown in Fig. 2, and Q
currentduring for flow shown in square frame, pump group switches, and concrete handoff procedure refers to Fig. 3.
Refer to Fig. 3, in the present embodiment, to realization design second flow from variable frequency pump starts, water system pump group switches 10 times.Variable frequency pump is always in running order, does not stop transport.
1. zero delivery and close to during zero delivery variable frequency pump start;
2. flow increases, and a little general pump puts into operation;
3. flow continues to increase, and two little general pumps put into operation;
4. flow continues to increase, and a large general pump puts into operation, two little power frequency pump shutdowns;
5. flow continues to increase, a large general pump, and a little general pump puts into operation;
6. flow continues to increase, a large general pump, and two little general pumps put into operation;
7. flow continues to increase, and two large general pumps put into operation, two little power frequency pump shutdowns;
8. flow continues to increase, two large general pumps, and a little general pump puts into operation;
9. flow continues to increase, two large general pumps, and two little general pumps put into operation;
10. flow continues to increase, and three large general pumps put into operation, two little power frequency pump shutdowns.
Be a reversible process between above-mentioned 10 steps, can adjust according to actual conditions.
Although be described the preferred embodiments of the present invention by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, can also make a lot of form, these all belong within protection scope of the present invention.
Claims (1)
1. the determination of the efficient parallel pumps of secondary water-supply full flow and a progress control method, is characterized in that, comprise the defining method of parallel pumps and the progress control method of parallel pumps;
The defining method of described parallel pumps comprises the following steps:
One) lift determined according to the highest intraday effect and the reference design water pressure of water system determines a variable frequency pump;
Two) n is determined according to following set of equation
1the little general pump of platform and n
2the large general pump of platform:
In formula: q
1-variable frequency pump efficient operating regime high order end flow (m
3/ h);
Q
2-variable frequency pump efficient operating regime low order end flow (m
3/ h);
Q
a-little general pump rated flow (m
3/ h);
Q
b-large general pump rated flow (m
3/ h);
N
1-little general pump number of units;
N
2-large general pump number of units;
Q
design-design second flow;
The progress control method of described parallel pumps: according to current water flow, during small flow, variable frequency pump puts into operation, along with the increase of flow, a little general pump puts into operation, flow continues to increase, second little general pump puts into operation, when flowing exceed certain value, little general pump is all stopped transport, and a large general pump puts into operation, if flow continues to increase, a little general pump puts into operation again, by that analogy, realize variable frequency pump by the switching gradually of little general pump and large general pump and run in higher efficiency range, switching point is determined according to following formula:
Q
current=AQ
a+ BQ
b+ q
1, 0≤A≤n
1, 0≤B≤n
2-1
In formula: Q
current-current water flow (m
3/ h);
A-for switching the number of units of little general pump;
B-for switching the number of units of large general pump;
Within the scope of design second flow, when current water flow meets the combination of above-mentioned formula, pump group should switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310166811.4A CN103244396B (en) | 2013-05-08 | 2013-05-08 | The determination of the efficient parallel pumps of secondary water-supply full flow and progress control method |
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|---|---|---|---|
| CN201310166811.4A CN103244396B (en) | 2013-05-08 | 2013-05-08 | The determination of the efficient parallel pumps of secondary water-supply full flow and progress control method |
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| CN103244396A CN103244396A (en) | 2013-08-14 |
| CN103244396B true CN103244396B (en) | 2015-08-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401932B (en) * | 2016-11-03 | 2018-01-12 | 中冶华天工程技术有限公司 | A kind of sewage disposal elevator pump progress control method |
| CN109778958A (en) * | 2019-03-20 | 2019-05-21 | 山东科源供排水设备工程有限公司 | The application method of the full frequency-changing water supply device of full flow and the equipment |
| CN115017666B (en) * | 2022-08-08 | 2022-11-01 | 廊坊市清泉供水有限责任公司 | Intelligent operation method and system for underground water source |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1216793A (en) * | 1997-10-30 | 1999-05-19 | 赵虎哲 | Variable-frequency, speed-regulation and constant pressure water supply equipment and method for high buildings |
| CN1818237A (en) * | 2006-03-16 | 2006-08-16 | 王峰 | High-efficient frequency-variable and speed-adjusting water supplying method with total flow and supplying apparatus thereof |
| CN201292546Y (en) * | 2008-11-14 | 2009-08-19 | 天津大学 | Secondary water supply system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5622112A (en) * | 1979-08-01 | 1981-03-02 | Hitachi Ltd | Control device for water level of distributing reservoir |
| JPH08193592A (en) * | 1995-01-13 | 1996-07-30 | Toshiba Corp | Pressure control device of water distribution pump |
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2013
- 2013-05-08 CN CN201310166811.4A patent/CN103244396B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1216793A (en) * | 1997-10-30 | 1999-05-19 | 赵虎哲 | Variable-frequency, speed-regulation and constant pressure water supply equipment and method for high buildings |
| CN1818237A (en) * | 2006-03-16 | 2006-08-16 | 王峰 | High-efficient frequency-variable and speed-adjusting water supplying method with total flow and supplying apparatus thereof |
| CN201292546Y (en) * | 2008-11-14 | 2009-08-19 | 天津大学 | Secondary water supply system |
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Granted publication date: 20150805 |