CN103244396A - Determining and operating control method for full-flow efficient parallel secondary water supply pump unit - Google Patents
Determining and operating control method for full-flow efficient parallel secondary water supply pump unit Download PDFInfo
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- CN103244396A CN103244396A CN2013101668114A CN201310166811A CN103244396A CN 103244396 A CN103244396 A CN 103244396A CN 2013101668114 A CN2013101668114 A CN 2013101668114A CN 201310166811 A CN201310166811 A CN 201310166811A CN 103244396 A CN103244396 A CN 103244396A
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Abstract
The invention discloses a determining and operating control method for full-flow efficient parallel secondary water supply pump unit. The determining and operating control method comprises a determining method and an operating control method for the parallel pump unit. The determining method for the parallel pump unit includes steps of (1) determining a variable-frequency pump according to the highest daily average flow rate and lift determined by referring to designed water pressure; (2) determining n<1> small-working-frequency pumps and n<2> large-working-frequency pumps according to an equation set. The operating control method for the parallel pump unit includes that according to current water usage quantity, the variable-frequency pump operates within an efficient range by gradual switching of the small-working-frequency pumps and the large-working-frequency pumps. Specification of the variable-frequency pump and specifications and number of the various working-frequency pumps are scientifically determined, control points of pump unit switching are provided, and equipment are in proper and suitable size. By the determining and operating control method, reliable water supply safety is provided, requirements of full-time flow and efficiency of water supply of the system can be met, frequency is variable, energy is saved and consumption is reduced. Meanwhile, references can be provided for automation design of pump unit control.
Description
Technical field
The present invention relates to a kind of parallel-connected pumps group for secondary water-supply, particularly relate to determining and progress control method of the efficient parallel-connected pumps group of a kind of secondary water-supply full flow.
Background technique
In tall building secondary water-supply field, adopt the frequency modulation water supply mode at present, early stage frequency modulation water supply product is made up of same model pump more, pump frequency conversion wherein, all the other pump power frequencies.Flow hour, 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 efficient scope, and during low flow rate condition, pump efficiency can drop to below 30%, thereby not only can cause the waste of the energy but also can shorten working life of water pump.Along with the progress in epoch, the variable-frequency control pump group is developed to multiple model by single model, the modified model frequency modulation water supply equipment that big pump is joined little pump occurs.Improved equipment often too much causes actual motion to switch loaded down with trivial details because of the frequency control of motor speed Type of pump of selecting for use or the frequency control of motor speed Type of pump is not suitable for, in whole design second flow weight range, multistage fallback district can occur, make the variable-frequency speed-adjusting energy-saving effect can not get good embodiment.
Summary of the invention
The present invention provides determining and progress control method of the efficient parallel-connected pumps group of a kind of secondary water-supply full flow for solving the technical problem that exists in the known technology, adopt the secondary water-supply parallel-connected pumps group of this method to have reliable water supply security, can satisfy the requirement efficiently of the full-time flow of system water supply, reach the purpose of energy-saving and frequency-variable consumption reduction, can also provide advisory opinion for the The Automation Design of pump group control simultaneously.
The technological scheme that the present invention takes for the technical problem that exists in the solution known technology is: determining and progress control method of the efficient parallel-connected pumps group of a kind of secondary water-supply full flow comprises the progress control method of definite method and the parallel-connected pumps group of parallel-connected pumps group; Definite method of described parallel-connected pumps group may further comprise the steps:
One) determines a variable frequency pump according to the highest per day flow of water system with reference to the lift that design is determined with water pressure;
Two) determine n according to following set of equation
1The little general pump of platform and n
2The big general pump of platform:
In the formula: q
1-variable frequency pump efficient operation scope high order end flow (m
3/ h);
q
2-variable frequency pump efficient operation scope low order end flow (m
3/ h);
Q
a-little general pump rated flow (m
3/ h);
Q
b-big general pump rated flow (m
3/ h);
n
1-little general pump platform number;
n
2-big general pump platform number;
q
Design-design second flow amount;
The progress control method of described parallel-connected pumps group: according to current water consumption, the switching gradually by little general pump and big general pump realizes that variable frequency pump is moving in efficient scope, and 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 the formula: Q
Current-current with water flow (m
3/ h);
A-for switching the platform number of little general pump;
B-for switching the platform number of big general pump;
In design second flow weight range, when satisfying the combination of above-mentioned formula with water flow, the pump group should be switched when current.
Advantage and good effect that the present invention has are: utilize the variable frequency pump working principle, in conjunction with actual used water amount big characteristics of proportion when height is per day, the model of variable frequency pump and model and the platform number of each general pump have scientifically been determined, and the control point that the pump group is switched proposed, instrument size is appropriately suitable, has reliable water supply security, can satisfy the requirement efficiently of the full-time flow of system water supply, reach the purpose of energy-saving and frequency-variable consumption reduction, can also provide advisory opinion for the The Automation Design of pump group control simultaneously.
Description of drawings
Fig. 1 is for using the model schematic representation of water system of the present invention;
Fig. 2 is for using the changes in flow rate schematic representation of water system of the present invention;
Fig. 3 is for using the skeleton diagram that the present invention moves control section.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
Determining and progress control method of the efficient parallel-connected pumps group of a kind of secondary water-supply full flow comprises the progress control method of definite method and the parallel-connected pumps group of parallel-connected pumps group;
Definite method of described parallel-connected pumps group may further comprise the steps:
One) determines the model of a variable frequency pump according to the highest per day flow of water system with reference to designing the lift of determining with water pressure; The highest per day flow sets up standard according to dwelling house classification and sanitary ware, in conjunction with the highest civil water quota, can find the solution, the highest per day flow find the solution the employing prior art, do not repeat them here.
Two) determine n according to following set of equation
1The little general pump of platform and n
2The big general pump of platform:
In the formula: q
1-variable frequency pump efficient operation scope high order end flow (m
3/ h);
q
2-variable frequency pump efficient operation scope low order end flow (m
3/ h);
Q
a-little general pump rated flow (m
3/ h);
Q
b-big general pump rated flow (m
3/ h);
n
1-little general pump platform number;
n
2-big general pump platform number;
q
Design-design second flow amount;
Determine variable frequency pump efficient operation scope high order end flow q by the model of described variable frequency pump
1With low order end flow q
2, and set up standard according to dwelling house classification and sanitary ware and to find the solution design second flow amount q
Design, find the solution model and the platform number of large and small general pump again according to above-mentioned formula.
The progress control method of described parallel-connected pumps group: according to current water consumption, the switching gradually by little general pump and big general pump realizes that variable frequency pump is moving in efficient scope, and 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 the formula: Q
Current-current with water flow (m
3/ h);
A-for switching the platform number of little general pump;
B-for switching the platform number of big general pump;
In design second flow weight range, when satisfying the combination of above-mentioned formula with water flow, the pump group should be switched when current.
Variable frequency pump puts into operation during small flow, 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 flow surpassed certain value, little general pump was all stopped transport, a big general pump puts into operation, flow is if continue to increase, and a little general pump puts into operation again, by that analogy, many general pumps switch gradually, can satisfy the requirement of design second flow amount when all big general pump and variable frequency pump parallel running.In the whole service process, variable frequency pump all turns round in efficient scope.
Application example of the present invention:
See also Fig. 1, according to " Code for design of building water supply and sewerage ", set up standard according to dwelling house classification, sanitary ware, in conjunction with the highest civil water quota, find the solution the design second flow amount q of certain secondary water supply system
DesignBe 27.7L/s(100m
3/ h), high per day flow Q
On averageBe 13m
3/ h, water system constant voltage value H is 70m, from satisfying pressure of supply water, variable frequency pump q
1Be 6m
3/ h, q
2Be 16m
3/ h.With q
Design, q
1, q
2The substitution formula is found the solution in (1), 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 with water pressure H.In the present embodiment, water system is selected a variable frequency pump 1 for use, two little general pumps 2 of same model, 3, four big general pumps 4 of same model, 5,6,7, wherein big general pump 7 is stand by pump, above-mentioned water system is a kind of varying speed and constant pressure feed water system, during system works, the pump group 8 is drawn water and is supplied water to user 14 from the pond, pressure transducer 9 continuous acquisition pump group discharge pressures, and pressure signal fed back to intelligent controller 11 in the 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 13 work of general pump controller, thereby control variable frequency pump 1 and little general pump 2,3, big general pump 4,5,6,7 mutual switchings make the system pipe network internal pressure remain on pressure set points.
See also Fig. 2, the progress control method of pump group:
Fig. 2 is above-mentioned secondary water supply system changes in flow rate schematic representation, from 0 to q
DesignEach flow all may occur, realize the efficient operation of full-time flow by the combination control of single variable frequency pump and various general pumps, two of every row several range of flow is pump group efficient operation section among Fig. 2, wherein general pump moves under rated flow, and variable frequency pump moves in efficient operation scope flow.In conjunction with formula (2), A, B value combined 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 is along variation shown in Figure 2, and Q
CurrentDuring for flow shown in the square frame, the pump group is switched, and concrete handoff procedure sees also Fig. 3.
See also Fig. 3, in the present embodiment, begin to realizing design second flow amount from the variable frequency pump startup, water system pump group is switched 10 times.Variable frequency pump is in running order always, does not stop transport.
1. zero delivery and during near 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 big general pump puts into operation, two unskilled labourer's frequency pump shutdowns;
5. flow continues to increase, a big general pump, and a little general pump puts into operation;
6. flow continues to increase, a big general pump, and two little general pumps put into operation;
7. flow continues to increase, and two big general pumps put into operation, two unskilled labourer's frequency pump shutdowns;
8. flow continues to increase, two big general pumps, and a little general pump puts into operation;
9. flow continues to increase, two big general pumps, and two little general pumps put into operation;
10. flow continues to increase, and three big general pumps put into operation, two unskilled labourer's frequency pump shutdowns.
Be a reversible process between above-mentioned 10 steps, can adjust according to actual conditions.
Although by reference to the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (1)
1. determining and progress control method of the efficient parallel-connected pumps group of secondary water-supply full flow is characterized in that, comprises the progress control method of definite method and the parallel-connected pumps group of parallel-connected pumps group;
Definite method of described parallel-connected pumps group may further comprise the steps:
One) determines a variable frequency pump according to the highest per day flow of water system with reference to the lift that design is determined with water pressure;
Two) determine n according to following set of equation
1The little general pump of platform and n
2The big general pump of platform:
In the formula: q
1-variable frequency pump efficient operation scope high order end flow (m
3/ h);
q
2-variable frequency pump efficient operation scope low order end flow (m
3/ h);
Q
a-little general pump rated flow (m
3/ h);
Q
b-big general pump rated flow (m
3/ h);
n
1-little general pump platform number;
n
2-big general pump platform number;
q
Design-design second flow amount;
The progress control method of described parallel-connected pumps group: according to current water consumption, the switching gradually by little general pump and big general pump realizes that variable frequency pump is moving in efficient scope, and 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 the formula: Q
Current-current with water flow (m
3/ h);
A-for switching the platform number of little general pump;
B-for switching the platform number of big general pump;
In design second flow weight range, when satisfying the combination of above-mentioned formula with water flow, the pump group should be switched when current.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103244396A true CN103244396A (en) | 2013-08-14 |
| CN103244396B CN103244396B (en) | 2015-08-05 |
Family
ID=48924166
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310166811.4A Expired - Fee Related 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401932A (en) * | 2016-11-03 | 2017-02-15 | 中冶华天工程技术有限公司 | Sewage treatment lift pump running 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 |
| CN115017666A (en) * | 2022-08-08 | 2022-09-06 | 廊坊市清泉供水有限责任公司 | Intelligent operation method and system for underground water source |
Citations (5)
| 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 |
| 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 |
-
2013
- 2013-05-08 CN CN201310166811.4A patent/CN103244396B/en not_active Expired - Fee Related
Patent Citations (5)
| 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 |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401932A (en) * | 2016-11-03 | 2017-02-15 | 中冶华天工程技术有限公司 | Sewage treatment lift pump running 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 |
| CN115017666A (en) * | 2022-08-08 | 2022-09-06 | 廊坊市清泉供水有限责任公司 | Intelligent operation method and system for underground water source |
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| CN103244396B (en) | 2015-08-05 |
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