CN107906023A - A kind of regulating valve of centrifugal pump is non-to close startup control method - Google Patents
A kind of regulating valve of centrifugal pump is non-to close startup control method Download PDFInfo
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- CN107906023A CN107906023A CN201711088352.7A CN201711088352A CN107906023A CN 107906023 A CN107906023 A CN 107906023A CN 201711088352 A CN201711088352 A CN 201711088352A CN 107906023 A CN107906023 A CN 107906023A
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- Prior art keywords
- valve
- centrifugal pump
- torque
- power
- regulating valve
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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
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0022—Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/01—Purpose of the control system
- F05D2270/05—Purpose of the control system to affect the output of the engine
- F05D2270/052—Torque
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
It is an object of the invention to provide a kind of non-valve closing of regulating valve of centrifugal pump to start control method, characteristic curve when starting the present invention provides centrifugal pump under non-closed valve state, and give its control valve opening and piping flow and centrifuge relation between pump power, the method that flow and power accurately control when giving centrifugation pump conduit non-valve closing starting state.According to the present invention, it can be achieved that in the case where the requirement of specific aperture is traffic requirement, examine whether power meets the requirements, or limited according to startup power, calculate control valve opening limitation, so as to fulfill the purpose for improving efficiency, reducing energy consumption and clean boot.
Description
Technical field
The present invention relates to a kind of regulating valve Poewr control method, more particularly to a kind of regulating valve of centrifugal pump is non-to close startup control
Method processed.
Background technology
Centrifugal pump rises emphatically as a kind of important equipment of Pipeline transport fluid in modern industry, agricultural, production and living
The effect wanted.Any problem is not present in startup typically for middle-size and small-size centrifugal pump group, and for the startup of large-scale pump assembly
Very big dash current may then be caused, influence the normal operation of power grid.It is additionally, since large centrifugal pump assembly inertia and resistance
Torque is big, makes to cause difficulty in starting sometimes.The shaft power of general centrifugal pump is shutting a minimum, is about rated power
30%-90%, also increases with the increase power of flow.Therefore it is general using pass valve Starting mode for centrifuging pump conduit.
For closing valve Starting mode, although startup power is small, start compared to valve opening, its water outlet efficiency is low, energy consumption
Greatly, and for valve opening opportunity hold also relatively difficult, and clear way valve starts that to be easy to cause shaft power excessive.Therefore, one is studied
The regulating valve for the centrifugal pump that kind falls between is non-to close startup control method, and accurately showing for efficiency is controlled and emphasize for pursuit
It is necessary for pump line path control system.
Through retrieval, have with the relevant patent of this patent：The method for starting centrifugal pump under outlet valve opening is (open
Number：CN102828971A), the patent provides under a kind of valve wide open state, pump startup method is centrifuged.But the patent does not relate to
And under the non-closed state of valve, centrifuge pump startup control method.
The content of the invention
To solve the above problems, startup control method is closed the present invention relates to a kind of regulating valve of centrifugal pump is non-.The present invention is right
In centrifuge pump conduit regulating valve is non-close when flow and Power Control be a kind of very effective method.
The purpose of the present invention is achieved through the following technical solutions：
For centrifuging pump conduit, from the gradual speedup of inactive state when closing regulating valve, torque press with rotating speed into square pass
System reaches rated speed, and torque at this time shuts the torque of a shaft power for respective pump, and rotating speed is constant afterwards.With regulating valve
Open, flow increase, torque also gradually changes.Start-up course torque changes as shown in Figure 1, M1It is to overcome friction of rest power to turn
Square, its value are generally less than the 30% of nominal torque.Increase after startup with rotating speed, torque increases to M2(shutting a torque), and
Flow increases to nominal torque M afterwards3。
And during for valve wide open, the start-up course of centrifugal pump is as shown in Fig. 2, its torque change such as ABCE in figure, is turning
Speed is n1When, have begun to send water, when rotating speed reaches rated speed, reached metered flow, torque at this time is nominal torque
M3。
Compare two kinds of Starting mode, it is clear that valve opening detent torque is more than valve closing, that is, valve opening power is more than valve closing power.
If can be based on being actually needed, start valve opening, accurate control start power are rationally adjusted, it is clear that be a kind of more economical
Method.According to the relation in pump assembly start-up course, met between various torques：
M=MMachine hinders+MWater resistance+MAccelerate
In formula：M-motor torque；
MMachine hinders- in start-up course, due to the moment of resistance of various mechanical frictional resistances (such as bearing, filler) formation；
MWater resistance- in start-up course, due to the moment of resistance of various flow resistances formation；
MAccelerate- in start-up course, the accelerating torque of unit.
MWater resistanceIt is the opplied moment by blade to water when closing valve startup, disk friction torque, and flow impact, vortex
Deng formation torque form.There are current when valve opening starts and excessively stream part rubs the torque M to be formedCurrent。
For in Fig. 1 and Fig. 2, M2=MMachine hinders+MWater resistance+MAccelerate, M3=MMachine hinders+MWater resistance+MAccelerate+MCurrent, M4=MCurrent.Shut a torque
M2With nominal torque M3It can be drawn by the characteristic curve of pump.M4That is MCurrentSize it is directly proportional to uninterrupted, therefore can be with
Uninterrupted is adjusted by control valve opening, accurately controls M4Size so that accurately control start power.
As shown in figure 3, when regulating valve selection is non-close startup when, its torque change such as ABCF in figure, the torque of point F is according to stream
Amount size can be calculated according to control valve opening and drawn, the rotating speed of point F is rated speed, therefore the power of point F can calculate
Go out.Curve is located between valve opening and valve closing start, and realizes and realize that valve is non-according to control valve opening control and close under startup, pumps
Accurate control of the unit for start power.
Brief description of the drawings
Fig. 1 is the valve closing detent torque variation diagram of one embodiment of the invention.
Fig. 2 is the clear way valve detent torque variation diagram of the same embodiment.
Fig. 3 is the non-valve closing detent torque variation diagram of the same embodiment.
In figure：M1It is to overcome friction of rest power torque；M2It is to shut a torque；M3Nominal torque；M4It is current and flow passage
Centimorgan wipe formed torque.
Embodiment
The present invention provides " a kind of non-valve closing of the regulating valve of centrifugal pump starts control method ".It realizes centrifugal pump start
For the accurate control of torque and power during startup, the purpose for realize and improve control efficiency, reducing energy consumption and safe operation.Under
Face is introduced the present invention with reference to the drawings and specific embodiments.
As shown in Figure 1, for the centrifugal pump start-up course of valve closing, just torque slightly declines after startup, then torque and rotating speed
Increase to D points into a square ratio.Flow increases after opening valve, and torque is slowly increased to nominal torque M3。
As shown in Fig. 2, during for valve wide open, the start-up course of centrifugal pump as shown in Fig. 2, its torque change as in figure
ABCE, is n in rotating speed1When, have begun to send water, when rotating speed reaches rated speed, reached metered flow, torque at this time is
Nominal torque M3。
Compare two kinds of Starting mode, it is clear that valve opening detent torque is more than valve closing, that is, valve opening power is more than valve closing power.
If can be based on being actually needed, start valve opening, accurate control start power are rationally adjusted, it is clear that be a kind of more economical
Method.According to the relation in pump assembly start-up course, met between various torques：
M=MMachine hinders+MWater resistance+MAccelerate
In formula：M-motor torque；
MMachine hinders- in start-up course, due to the moment of resistance of various mechanical frictional resistances (such as bearing, filler) formation；
MWater resistance- in start-up course, due to the moment of resistance of various flow resistances formation；
MAccelerate- in start-up course, the accelerating torque of unit.
MWater resistanceIt is the opplied moment by blade to water when closing valve startup, disk friction torque, and flow impact, vortex
Deng formation torque form.There are current when valve opening starts and excessively stream part rubs the torque M to be formedCurrent。
For in Fig. 1 and Fig. 2, M2=MMachine hinders+MWater resistance+MAccelerate, M3=MMachine hinders+MWater resistance+MAccelerate+MCurrent, M4=MCurrent.Shut a torque
M2With nominal torque M3It can be drawn by the characteristic curve of pump.M4That is MCurrentSize it is directly proportional to uninterrupted, therefore can be with
Uninterrupted is adjusted by control valve opening, accurately controls M4Size so that accurately control start power.
As shown in figure 3, when regulating valve selection is non-close startup when, its torque change such as ABCF in figure, the torque of point F is according to stream
Amount size can be calculated according to control valve opening and drawn, the rotating speed of point F is rated speed, therefore the power of point F can calculate
Go out.
Adjusting of the regulating valve for flow meets equation：
In formula：WtIt is measured discharge；
WT, qwIt is standard-sized sheet flow under actual pressure differential；
GsIt is valve perfect flow characteristics；
Kv is discharge coefficient；
Δ P is that operating condition lower valve pressure at two ends is poor；
R is valve regulating ratio；
L is valve relative opening degree；
F function becomes according to regulation valve core type.
The relation for centrifuging pump power and torque, rotating speed meets：
P=Mn/9550
In formula：P is power；
M is torque；
N is rotating speed.
M=W in the present embodimentt/QIt is specified·(M3-M2)+M2
In formula：QIt is specifiedIt is centrifugal pump metered flow.
Therefore, the power of F points is
For example, for the regulating valve of an equal percentage spool, Kv=50, R=50, G=R(L-t).If relative opening degree L=
0.3, i.e. G=50(0.3-1)=0.065, if valve pressure at two ends difference is Δ P=300K both ends, shut a moment of torsion M2=15NM,
Nominal torque M3=25NM, rated speed n=1200rpm, metered flow QIt is specified=86.6m3/ h, then F points power is at this time
Pump startup power under the corresponding rated speed of other apertures, which can similarly be calculated as above, to be drawn, and for non-volume
Determine under rotating speed, i.e., when rotating speed does not reach rated speed, the power of corresponding points equally can be according under clear way valve and valve closing two states
Corresponding torque calculation, computational methods equally as above,M2' it is respectively corresponding a certain non-volume
Determine centrifugal pump valve opening under rotating speed, valve closing detent torque.
Therefore, it is higher vice versa for start power requirement, or for the higher centrifugal pump pipeline of start traffic requirement,
The above method can be utilized to control to adjust valve opening and realize purpose.
Those listed above is a series of to describe illustrating only for possible embodiments of the invention in detail,
They simultaneously are not used to limit the scope of the invention, all equivalent embodiments made without departing from skill spirit of the present invention or change
It should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of regulating valve of centrifugal pump is non-to close startup control method, it is characterised in that：When centrifuging pump startup, regulating valve is kept
Certain aperture, the accurate control for the non-valve closing starting state down-off of centrifugation pump conduit and power is realized according to specific requirement
System, so as to fulfill the purpose for improving efficiency, reducing energy consumption and clean boot.
2. a kind of regulating valve of centrifugal pump according to right 1 is non-to close startup control method, it is characterised in that：Regulating valve for
Flow-rate adjustment meetsWherein WtIt is measured discharge；WT, qwIt is
Standard-sized sheet flow under actual pressure differential；GsIt is valve perfect flow characteristics；KvIt is discharge coefficient；Δ P is two side pressure of operating condition lower valve
Force difference；R is valve regulating ratio；L is valve relative opening degree；F function becomes according to regulation valve core type.
3. a kind of regulating valve of centrifugal pump according to right 1 is non-to close startup control method, it is characterised in that：Under a certain flow
Centrifugal pump maximum detent torque M=Wt/QIt is specified·(M3-M2)+M2, wherein M2It is to shut a torque；M3Nominal torque, QIt is specifiedIt is specified
Flow.
4. a kind of regulating valve of centrifugal pump according to right 1 is non-to close startup control method, it is characterised in that：Regulating valve with from
Relational expression between heart pump startup power is：Its
Middle M '3、M2' it is respectively centrifugal pump valve opening, valve closing detent torque under corresponding a certain non-rated speed, required according to specific aperture
That is traffic requirement, it can be deduced that whether power meets the requirements at this time, otherwise is limited according to startup power, can calculate aperture limit
System.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711088352.7A CN107906023A (en) | 2017-11-08 | 2017-11-08 | A kind of regulating valve of centrifugal pump is non-to close startup control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711088352.7A CN107906023A (en) | 2017-11-08 | 2017-11-08 | A kind of regulating valve of centrifugal pump is non-to close startup control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107906023A true CN107906023A (en) | 2018-04-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711088352.7A Pending CN107906023A (en) | 2017-11-08 | 2017-11-08 | A kind of regulating valve of centrifugal pump is non-to close startup control method |
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| CN (1) | CN107906023A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939582A (en) * | 2019-12-05 | 2020-03-31 | 万华化学集团股份有限公司 | Pump control method, storage medium, and electronic device |
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|---|---|---|---|---|
| EP0207866A1 (en) * | 1985-06-03 | 1987-01-07 | Neyrpic | Pump starting method by means of a pump functioning as a turbine |
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| JP2010058089A (en) * | 2008-09-05 | 2010-03-18 | Hitachi Koki Co Ltd | Centrifuge |
| CN102828971A (en) * | 2012-09-13 | 2012-12-19 | 内蒙古包钢钢联股份有限公司 | Method of starting centrifugal pump in discharge valve opening state |
| CN102840140A (en) * | 2012-08-16 | 2012-12-26 | 合肥通用机械研究院 | Outer ring type efficient starting system for self-priming pump and starting method thereof |
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| CN103671060A (en) * | 2013-12-06 | 2014-03-26 | 杭州哲达节能科技有限公司 | Sensor-free constant current pump valve integrated device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939582A (en) * | 2019-12-05 | 2020-03-31 | 万华化学集团股份有限公司 | Pump control method, storage medium, and electronic device |
| CN110939582B (en) * | 2019-12-05 | 2021-04-20 | 万华化学集团股份有限公司 | Pump control method, storage medium, and electronic device |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180413 |
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| RJ01 | Rejection of invention patent application after publication |