CN101270755B - Timing and switching method for controlling water pump fan parallel-connection energy-saving operation - Google Patents
Timing and switching method for controlling water pump fan parallel-connection energy-saving operation Download PDFInfo
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- CN101270755B CN101270755B CN200810099427.6A CN200810099427A CN101270755B CN 101270755 B CN101270755 B CN 101270755B CN 200810099427 A CN200810099427 A CN 200810099427A CN 101270755 B CN101270755 B CN 101270755B
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Abstract
The invention relates to a speed regulation and switching method which is used for controlling the parallel energy saving operation of a pump fan. A power saving operation speed switching unit is added between a conventional enclosed ring controlled controller and a governor and implements the energy saving speed regulation and the switching control on the operation of the pump fan. The power saving operation speed switching unit determines a flow switching point and a speed switching point for the parallel energy saving operation of the pump and the fan according to the set pressure and the set flow required by the process, the practical pressure and the practical flow of the pump fan and the characteristic parameters of the pump fan.
Description
Affiliated technical field
The present invention relates to the energy-saving operating method for controlling water pump fan, in particular for controlling speed governing and the switching method of water pump fan parallel-connection energy-saving operation.
Background technique
The power consumption of water pump fan accounts for the 30-35% of whole world total electricity consumption, a lot of well-known electric manufacturers of the world have all released the product for water pump fan energy-saving run as companies such as ABB, Siemens, Fuji, Toshiba, AB, General Electric, speed regulator is current most widely used technological means, use speed regulator to regulate the rotating speed of water pump fan, to reduce the waste that traditional valve regulated is brought in the past.Conventional speed regulator comprises frequency variator, cascade speed control device, electromagnetic speed regulator and hydraulic couplers etc., and at present, frequency variator is applied the rapidest because self-operating efficiency is relatively high.Current known water pump fan speed governing operation method is conventional single closed loop control, in conventional single closed loop control method, just to meet technological requirement as simple target, do not ensure method and measure that water pump fan overall operation efficiency is the highest, thereby cause water pump fan can not guarantee to move under minimum power consumption.The known design method for water pump fan is to carry out according to conventional design code at present, and design code is a guiding design principle, do not guarantee that water pump fan realizes the concrete equipment configuration method of power-saving running and the energy-saving design index of quantification.At present knownly contrast and provide with valve control for the energy-conservation measuring and calculating of water pump fan mode of speed regulation, more do not provide comparative approach for the water pump fan constant speed method of operation without valve regulated, and do not consider the variation that motor and arrangements for speed regulation operational efficiency are in operation yet, so there is narrow limitation and energy-conservation measuring and calculating error in these known methods.Patent 03101326.0 has provided the energy-conservation design measuring and calculating operation method in water pump fan station, patent 02159869.X has provided the operational efficiency controlling method of separate unit water pump fan under speed governing state, patent 03103247.8 has provided the water pump fan operational efficiency controlling method for industrial control unit (ICU) and configuration software, these patents have solved the quantitative implementation method of current water pump fan energy-saving design measuring and calculating and operation, but these patents are for the economize on electricity rotating speed method of more than one water pump fan parallel running, the method of economize on electricity switching method and searching economize on electricity switching point does not provide concrete description.
Summary of the invention
Operate in the problem in efficient district in order to overcome the water pump fan that can not guarantee existing in conventional single closed loop control method, for the optimum speed controlling method that lacks economize on electricity under current water pump fan parallel running mode, the present situation of best switching method and searching optimum switching point method, the invention provides a kind of for controlling method for controlling number of revolution and the switching method of water pump fan power-saving running in parallel, and provide best economize on electricity switching point, these methods can be in the situation that meeting normal technology controlling and process requirement, effectively guarantee that water pump fan operates in electricity-saving state in the situation that in parallel at many.
The technical solution adopted for the present invention to solve the technical problems is: between the controller and speed regulator of conventional closed loop control, increase power-saving running speed governing switching unit, speed governing and switching controls that power-saving running speed governing switching unit economizes on electricity to the operation of water pump fan.Power-saving running speed governing switching unit is according to the special parameter of the setting pressure of technological requirement, the actual pressure of setting flow, water pump fan, actual flow, water pump fan, determine flow switch point and the rotating speed switching point of water pump fan power-saving running in parallel, do not consider slippage factor, frequency and rotating speed are one to one, so rotating speed switching point is told about to the situation that can represent frequency switching point.
At the water pump fan station that has the parallel connection of n platform water pump fan, there is the operation of m-1 platform water pump fan, the total head providing (or total head) at water pump fan station is H (m-1), the total discharge of water pump fan station output is Q
m-1(H (m-1)), the total consumed power at water pump fan station is P
m-1(H (m-1)), P
i (m-1)(H (m-1)) representative power that i platform water pump fan consumes under total head (or total head) H (m-1) under the operation of m-1 platform water pump fan, Q
i (m-1)(H (m-1)) representative is the output flow of i platform water pump fan under total head (or total head) H (m-1) under the operation of m-1 platform water pump fan, n
i (m-1)(H (m-1)) representative i platform water pump fan rotating speed under total head (or total head) H (m-1) under m-1 platform water pump fan runnability, has: Q
m-1(H (m-1))=Q
1 (m-1)(H (m-1))+Q
2 (m-1)(H (m-1)))+... + Q
m-1 (m-1)(H (m-1)), P
m-1(H (m-1))=P
1 (m-1)(H (m-1))+P
2 (m-1)(H (m-1))+... + P
m-1 (m-1)(H (m-1)).
The in the situation that of m platform water pump fan actual motion, the total head providing (or total head) at water pump fan station is H (m), and the total discharge of water pump fan station output is Q
m(H (m)), the total consumed power at water pump fan station is P
m(H (m)), P
i (m)(H (m)) representative power that i platform water pump fan consumes under total head (or total head) H (m) under m platform water pump fan runnability, Q
i (m)(H (m)) representative i platform water pump fan output flow under total head (or total head) H (m) under m platform water pump fan runnability, n
i (m)(H (m)) representative i platform water pump fan rotating speed under total head (or total head) H (m) under m platform water pump fan practical operation situation, has: Q
m(H (m))=Q
1 (m)(H (m))+Q
2 (m)(H (m))+... + Q
m (m)(H (m)), P
m(H (m))=P
1 (m)(H (m))+P
2 (m)(H (m)+... + P
m (m)(H (m)).
In the situation that water pump fan can fully carry out rotational speed regulation, if when the parameters such as the pressure of technological requirement, flow, temperature or concentration still can not maintain the value of requirement, at this moment just must carry out the switching of water pump fan operation number of units.
For the parallel connection of non-same model water pump fan, 1 X-type water pump fan that rated flow is less, total head (or total head) is HX (1), flow is Q
1 (1)(H
x(1)), power is P
1 (1)(H
x(1)), rotating speed is n
1 (1)(H
x(1)), 1 Y type water pump fan that rated flow is larger, total head (or total head) is H
y(1), flow is Q
2 (1)(H
y(1)), power is P
2 (1)(H
y(1)), rotating speed is n
2 (1)(H
y(1)), power-saving running speed governing switching unit provides the optimum switching point of 1 X-type water pump fan and 1 Y type water pump fan power-saving running and is: H
x(1)=H
y(1), Q
1 (1)(H
x(1))=Q
2 (1)(H
y(1)), P
1 (1)(H
x(1))=P
2 (1)(H
y(1)).
For the parallel connection of non-same model water pump fan, the total less X-type water pump fan of m1 platform rated flow, the total larger Y type water pump fan of i1 platform rated flow, m1+i1=n, suppose to have m platform X-type water pump fan in operation, have i platform Y type water pump fan in operation, m is less than or equal to m1, i is less than or equal to i1, and the total head (or total head) of m platform X-type water pump fan is H
x(m), total discharge is Q
m(H
x(m)), total output is P
m(HX (m)), the flow of m platform X-type water pump fan is respectively Q
1 (m)(H
x(m)), Q
2 (m)(H
x(m)) ..., Q
m (m)(H
x(m)), power is respectively P
1 (m)(H
x(m)), P
2 (m)(H
x(m)) ..., P
m (m)(H
x(m)), rotating speed is respectively n
1 (m)(H
x(m)), n
2 (m)(H
x(m)) ..., n
m (m)(H
x(m)), the total head (or total head) of i platform Y type water pump fan is H
y(i), total discharge is Q
i(H
y(i)), total output is P
i(H
y(i)), the flow of i platform Y type water pump fan is respectively Q
1 (i)(H
y(i)), Q
2 (i)(H
y(i)) ..., Q
i (i)(H
x(i)), power is respectively P
1 (i)(H
y(i)), P
2 (i)(H
y(i)) ..., P
i (i)(H
x(i)), rotating speed is respectively n
1 (i)(H
y(i)), n
2 (i)(H
y(i)) ..., n
i (i)(H
x(i)), the total head (or total head) of m+1 platform X-type water pump fan is H
x(m+1), total discharge is Q
m+1(H
x(m+1)), total output is P
m+1(HX (m+1)), the flow of m+1 platform X-type water pump fan is respectively Q
1 (m+1)(H
x(m+1)), Q
2 (m+1)(H
x(m+1)) ..., Q
m+1 (m+1)(H
x(m+1)), power is respectively P
1 (m+1)(H
x(m+1)), P
2 (m+1)(H
x(m+1)) ..., P
m+1 (m+1)(H
x(m+1)), rotating speed is respectively n
1 (m+1)(H
x(m+1)), n
2 (m+1)(H
x(m+1)) ..., n
m+1 (m+1)(H
x(m+1)), the total head (or total head) of i+1 platform Y type water pump fan is H
y(i+1), total discharge is Q
i+1(H
y(i+1)), total output is P
i+1(H
y(i+1)), the flow of i+1 platform Y type water pump fan is respectively Q
1 (i+1)(H
y(i+1)), Q
2 (i+1)(H
y(i+1)) ..., Q
i+1 (i+1)(H
x(i+1)), power is respectively P
1 (i+1)(H
y(i+1)), P
2 (i+1)(H
y(i+1)) ..., P
i+1 (i+1)(H
x(i+1)), rotating speed is respectively n
1 (i+1)(H
y(i+1)), n
2 (i+1)(H
y(i+1)) ..., n
i+1 (i+1)(H
x(i+1)), the span of m is 0 to m1, and the span of i is 0 to i1, in the time that m gets m1, just there is not the switching of m platform X-type water pump fan and m+1 platform X-type water pump fan, in the time that i gets i1, just do not have the switching of i platform Y type water pump fan and i+1 platform Y type water pump fan.
Owing to being parallel running, there is H
x(m)=H
y(i)=H
x(m+1), in the time that the total discharge of m platform X-type water pump fan and i platform Y type water pump fan is not enough to maintain technological requirement, need to be switched to m+1 platform X-type water pump fan and the operation of i platform Y type water pump fan or m platform X-type water pump fan and i+1 platform Y type water pump fan switching point in service has that a kind of compound mode of solution and total discharge minimum and total output minimum, and the optimum switching point that power-saving running speed governing switching unit provides m platform X-type water pump fan and i platform Y type water pump fan and m+1 platform X-type water pump fan and i platform Y type water pump fan power-saving running is: H
x(m)=H
y(i)=H
x(m+1), Q
m(H
x(m))=Q
m+1(H
x(m+1)), P
m(H
x(m))=P
m+1(H
x(m+1)), Q
m(H
x(m))=Q
1 (m)(HX (m))+Q
2 (m)(H
x(m))+... + Q
m (m)(H
x(m)), P
m(H
x(m))=P
1 (m)(H
x(m))+P
2 (m)(H
x(m))+... + P
m (m)(H
x(m)), Q
m+1(H
x(m+1))=Q
1 (m+1)(H
x(m+1))+Q
2 (m+1)(H
x(m+1))+... + Q
m+1(m+1) (H
x(m+1)), P
m+1(H
x(m+1))=P
1 (m+1)(H
x(m+1))+P
2 (m+1)(H
x(m+1))+... + P
m+1 (m+1)(H
x(m+1)), Q
1 (m)(H
x(m))=Q
2 (m)(H
x(m))=...=Q
m (m)(H
x(m)), P
1 (m)(H
x(m))=P
2 (m)(H
x(m))=...=P
m (m)(H
x(m)), Q
1 (m+1)(H
x(m+1))=Q
2 (m+1)(H
x(m+1))=...=Q
m+1 (m+1)(H
x(m+1)), P
1 (m+1)(H
x(m+1))=P
2 (m+1)(H
x(m+1))=...=P
m+1 (m+1)(H
x(m+1)), Q
1 (i)(H
y(i))=Q
2 (i)(H
y(i))=...=Q
i (i)(H
y(i)), P
1 (i)(H
y(i))=P
2 (i)(H
y(i))=...=P
i (i)(H
y(i)), the speed regulating method of economize on electricity is: n
1 (m)(H
x(m))=n
2 (m)(H
x(m))=...=n
m (m)(H
x(m)), n
1 (m+1)(H
x(m+1))=n
2 (m+1)(H
x(m+1))=...=n
m+1 (m+1)(H
x(m+1)), n
1 (i)(H
y(i))=n
2 (i)(H
y(i))=...=n
i (i)(H
y(i)).The optimum switching point that power-saving running speed governing switching unit provides m platform X-type water pump fan and i platform Y type water pump fan and m platform X-type water pump fan and i+1 platform Y type water pump fan power-saving running is: H
x(m)=H
y(i)=H
y(i+1), Q
i(H
y(i))=Q
i+1(H
y(i+1)), P
i(H
y(i))=P
i+1(H
y(i+1)), Q
i(H
y(i))=Q
1 (i)(H
y(i))+Q
2 (i)(H
y(i))+... + Q
i (i)(H
y(i)), P
i(H
y(i))=P
1 (i)(H
y(i))+P
2 (i)(H
y(i))+... + P
i (i)(H
y(i)), Q
i+1(H
y(i+1))=Q
1 (i+1)(H
y(i+1))+Q
2 (i+1)(H
y(i+1))+... + Q
i+1 (i+1)(H
y(i+1)), P
i+1(H
y(i+1))=P
1 (i+1)(H
y(i+1))+P
2 (i+1)(H
y(i+1))+... + P
i+1 (i+1)(H
y(i+1)), Q
1 (i)(H
y(i))=Q
2 (i)(H
y(i))=...=Q
i (i)(H
y(i)), P
1 (i)(H
y(i))=P
2 (i)(H
y(i))=...=P
i (i)(H
y(i)), Q
1 (i+1)(H
y(i+1))=Q
2 (i+1)(H
y(i+1))=...=Q
i+1 (i+1)(H
y(i+1)), P
1 (i+1)(H
y(i+1))=P
2 (i+1)(H
y(i+1))=...=P
i+1 (i+1)(H
y(i+1)), Q
1 (m)(H
x(m))=Q
2 (m)(H
x(m))=...=Q
m (m)(H
x(m)), P
1 (m)(H
x(m))=P
2 (m)(H
x(m))=...=P
m (m)(H
x(m)), the speed regulating method of economize on electricity is: n
1 (i)(H
y(i))=n
2 (i)(H
y(i))=...=n
i (i)(H
y(i)), n
1 (i+1)(H
y(i+1))=n
2 (i+1)(H
y(i+1))=...=n
i+1 (i+1)(H
y(i+1)), n
1 (m)(H
x(m))=n
2 (m)(H
x(m))=...=n
m (m)(H
x(m)).
In the time that the total discharge of m+1 platform X-type water pump fan and i platform Y type water pump fan or m platform X-type water pump fan and i+1 platform Y type water pump fan exceedes the flow of technological requirement, need to be switched to m platform X-type water pump fan and the operation of i platform Y type water pump fan time, it is identical with said process with energy-saving speed regulating mode that its power-saving running optimum switching point is found mode.
For the parallel connection of same model water pump fan, 1 water pump fan and 2 problems that water pump fan switches, the total head (or total head) of a water pump fan is H (1), total discharge is Q
1(H (1)), Q
1(H (1)) equals the flow Q of a water pump fan
1 (1)(H (1)), total output is P
1(H (1)), P
1(H (1)) equals the power P of a water pump fan
1 (1)(H (1)), rotating speed is n
1 (1)(H (1)), the total head (or total head) of two water pump fans is H (2), total discharge is Q
2(H (2)), total output is P
2(H (2)), the flow of two water pump fans is respectively Q
1 (2)(H (2)) and Q
2 (2)(H (2)), the power of two water pump fans is respectively P
1 (2)(H (2)) and P
2 (2)(H (2)), rotating speed is respectively n
1 (2)(H (2)) and n
2 (2)(H (2)), power-saving running speed governing switching unit provides 1 water pump fan and with the optimum switching point of 2 water pump fan power-saving runnings is: H (1)=H (2), Q
1(H (1))=Q
2(H (2)), P
1(H (1))=P
2(H (2)), Q
2(H (2))=Q
1 (2)(H (2))+Q
2 (2)(H (2)), P
2(H (2))=P
1 (2)(H (2))+P
2 (2)(H (2)), Q
1 (2)(H (2))=Q
2 (2)(H (2)), P
1 (2)(H (2))=P
2 (2)(H (2)), the speed regulating method of economize on electricity is: n
1 (2)(H (2))=n
2 (2)(H (2)).
For the parallel connection of same model water pump fan, the problem that m-1 platform water pump fan and m platform water pump fan switch, the total head (or total head) of m-1 platform water pump fan is H (m-1), total discharge is Q
m-1(H (m-1)), total output is P
m-1(H (m-1)), the flow of m-1 platform water pump fan is respectively Q
1 (m-1)(H (m-1)), Q
2 (m-1)(H (m-1)) ..., Q
m-1 (m-1)(H (m-1)), the power of m-1 platform water pump fan is respectively P
1 (m-1)(H (m-1)), P
2 (m-1)(H (m-1)) ..., P
m-1 (m-1)(H (m-1)), the rotating speed of m-1 platform water pump fan is respectively n
1 (m-1)(H (m-1)), n
2 (m-1)(H (m-1)) ..., n
m (m-1)(H (m-1)), the total head (or total head) of m platform water pump fan is H (m), total discharge is Q
m(H (m)), total output is P
m(H (m)), the flow of m platform water pump fan is respectively Q
1 (m)(H (m)), Q
2 (m)(H (m)) ..., Q
m (m)(H (m)), the power of m platform water pump fan is respectively P
1 (m)(H (m)), P
2 (m)(H (m)) ..., P
m (m)(H (m)), the rotating speed of m platform water pump fan is respectively n
1 (m)(H (m)), n
2 (m)(H (m)) ..., n
m (m)(H (m)), the span of m is 2 to n, the optimum switching point that power-saving running speed governing switching unit provides m-1 platform water pump fan and m platform water pump fan power-saving running is: H (m-1)=H (m), Q
m-1(H (m-1))=Q
m(H (m)), P
m-1(H (m-1))=P
m(H (m)), Q
m-1(H (m-1))=Q
1 (m-1)(H (m-1))+Q
2 (m-1)(H (m-1))+... + Q
m-1 (m-1)(H (m-1)), P
m-1(H (m-1))=P
1 (m-1)(H (m-1))+P
2 (m-1)(H (m-1))+... + P
m-1 (m-1)(H (m-1)), Q
m(H (m))=Q
1 (m)(H (m))+Q
2 (m)(H (m))+... + Q
m (m)(H (m)), P
m(H (m))=P
1 (m)(H (m))+P
2 (m)(H (m))+... + P
m (m)(H (m)), Q
1 (m-1)(H (m-1))=Q
2 (m-1)(H (m-1))=...=Q
m-1 (m-1)(H (m-1)), P
1 (m-1)(H (m-1))=P
2 (m-1)(H (m-1))=...=P
m-1 (m-1)(H (m-1)), Q
1 (m)(H (m))=Q
2 (m)(H (m))=...=Q
m (m)(H (m)), P
1 (m)(H (m))=P
2 (m)(H (m))=...=P
m (m)(H (m)), the speed regulating method of economize on electricity is: n
1 (m-1)(H (m-1))=n
2 (m-1)(H (m-1))=...=n
m-1 (m-1)(H (m-1)), n
1 (m)(H (m))=n
2 (m)(H (m))=...=n
m (m)(H (m)).
According to method and the speed regulating method of the searching switching point of above-mentioned economize on electricity, the total head (or total head) of establishing technological requirement is H
sV, under identical total head (or total head), when the operation of m-1 platform water pump fan, if H (m-1) is less than H
sV, the rotating speed of m-1 platform water pump fan increases always, while arriving switching point, if H (m-1) is still less than H
sV, be switched to the operation of m platform water pump fan; When the operation of m platform water pump fan, if H (m) is greater than H
sV, the rotating speed of m platform water pump fan reduces always, while arriving switching point, if H (m) is still greater than H
sV, be switched to the operation of m-1 platform water pump fan, m value 2 to n.
According to method and the speed regulating method of the above-mentioned searching switching point providing, under identical total head (or total head), get m from 2 to n, flow Q changes from 0 to this water pump fan peak rate of flow, draws [Q corresponding to every bit flow Q
m-1(m-1)/P
m-1(m-1)] value, can draw the maximum unit power consumption production curve of complete water pump fan station with changes in flow rate, contrast with the current effective unit power consumption output at each concrete flow in water pump fan station, can provide concrete economize on electricity ratio, draw [P corresponding to every bit flow Q
m-1(m-1)/Q
m-1(m-1)] value, can draw the minimum specific yield power consumption curve of complete water pump fan station with changes in flow rate, contrasts with the current effective unit output power consumption at each concrete flow in water pump fan station, also can draw economize on electricity ratio.
In order to realize the Energy Saving Control to water pump fan easily on a large amount of control apparatuss such as PLC, computer that use of industry, above-mentioned optimizing switching method need to be become more easily to the engineering method of realizing, provide take flow and rotating speed as switching controls point the energy-saving switching method of easily realizing in engineering respectively below.
For the situation of same model water pump fan parallel connection, the maximum total head (or total head) providing is provided at water pump fan station is H
m, the minimum total head (or total head) providing is provided at water pump fan station is H
m, obtaining water pump fan, to stand in total head (or total head) be H
mtime, the energy-conservation flow switch point of m-1 platform water pump fan and m platform water pump fan is Q
m-1m(H
m), Q
m-1m(H
m) be that m-1 platform water pump fan is H at total head (or pressure)
mtime energy-saving run allow peak rate of flow, Q
m-1m(H
m) corresponding m-1 platform water pump fan is H at total head (or pressure)
mtime energy-saving run maximum (top) speed n
m-1M(H
m), Q
m-1m(H
m) be also that m platform water pump fan is H at total head (or pressure) simultaneously
mtime energy-saving run allow minimum discharge, Q
m-1m(H
m) corresponding m platform water pump fan is H at total head (or pressure)
mtime energy-saving run minimum speed n
mm(H
m), the span of m is 2 to n.Obtaining water pump fan, to stand in total head (or total head) be H
mtime, the energy-conservation flow switch point of m-1 platform water pump fan and m platform water pump fan is Q
m-1m(H
m), Q
m-1m(H
m) be that m-1 platform water pump fan is H at total head (or pressure)
mtime energy-saving run allow peak rate of flow, Q
m-1m(H
m) corresponding m-1 platform water pump fan is H at total head (or pressure)
mtime energy-saving run maximum (top) speed n
m-1M(H
m), Q
m-1m(H
m) be also that m platform water pump fan is H at total head (or pressure) simultaneously
mtime energy-saving run allow minimum discharge, Q
m-1m(H
m) corresponding m platform water pump fan is H at total head (or pressure)
mtime energy-saving run minimum speed n
mm(H
m), the span of m is 2 to n.
While selecting flow to control as switching point, m-1 platform water pump fan and m platform water pump fan actual motion are at total head (or total head) H
sVthe flow switch point Q of Shi Jieneng
m-1m(H
sV) can go out engineering switching point, Q with following linear relationship calculus of approximation
m-1m(H
sv)=Q
m-1m(H
m)-(Q
m-1m(H
m)-Q
m-1m(H
m)) × (H
m-H
sV)/(H
m-H
m).
While selecting rotating speed to control as switching point, m-1 platform water pump fan actual motion is at total head (or total head) H
sVthe maximum speed switching point n of Shi Jieneng
m-1M(H
sV) can go out engineering switching point, n with following linear relationship calculus of approximation
m-1M(H
sV)=n
m-1M(H
m)-(n
m-1m(H
m)-n
m-1m(H
m)) × (H
m-H
sV)/(H
m-H
m).
While selecting rotating speed to control as switching point, m platform water pump fan actual motion is at total head (or total head) H
sVthe minimum speed switching point n of Shi Jieneng
mm(H
sV) can go out engineering switching point, n with following linear relationship calculus of approximation
mm(H
sV)=n
mm(H
m)-(n
mm(H
m)-n
mm(H
m)) × (H
m-H
sV)/(H
m-H
m).
At H
mand H
mbetween a total head (or total head) H
sV1point, show that the energy-conservation flow switch point of m-1 platform water pump fan and m platform water pump fan is Q
m-1m(H
sV1), Q
m-1m(H
sV1) be that m-1 platform water pump fan is H at total head (or pressure)
sV1time energy-saving run allow peak rate of flow, Q
m-1m(H
sV1) corresponding m-1 platform water pump fan is H at total head (or pressure)
sV1time energy-saving run maximum (top) speed n
m-1M(H
sV1), Q
m-1m(H
sV1) be also that m platform water pump fan is H at total head (or pressure) simultaneously
sV1time energy-saving run allow minimum discharge, Q
m-1m(H
sV1) corresponding m platform water pump fan is H at total head (or pressure)
sV1time energy-saving run minimum speed n
mm(H
sV1), the span of m is 2 to n.
While selecting flow to control as switching point, m-1 platform water pump fan and m platform water pump fan actual motion are at total head (or total head) H
sVthe flow switch point Q of Shi Jieneng
m-1m(H
sV) can be with than the linear relationship close method that seemingly draws computational engineering switching point of quadratic curve more accurately, Q
m-1m(H
sv)=A+B × H
sV+ C × H
2 sV, wherein: C=[(Q
m-1m(H
m)-Q
m-1m(H
m))/(H
m-H
m)-(Q
m-1m(H
m)-Q
m-1m(H
sV1))/(H
m-H
sV1)]/(H
m-H
sV1)), B=[Q
m-1m(H
m)-Q
m-1m(H
m)-C × (H
2 m-H
2 m)]/(H
m-H
m), A=Q
m-1m(H
m)-B × H
m-C × H
2 m.
While selecting rotating speed to control as switching point, m-1 platform water pump fan actual motion is at total head (or total head) H
sVthe maximum speed switching point n of Shi Jieneng
m-1M(H
sV) can go out engineering switching point, n with quadratic curve calculus of approximation
m-1M(H
sV)=A
2+ B
2× H
sV+ C
2× H
2 sV, wherein: C
2=[(n
m-1M(H
m)-n
m-1M(H
m))/(H
m-H
m)-(n
m-1M(H
m)-n
m-1M(H
sV1))/(H
m-H
sV1)]/(H
m-H
sV1)), B
2=[n
m-1M(H
m)-n
m-1M(H
m)-C
2× (H
2 m-H
2 m)]/(H
m-H
m), A
2=n
m-1M(H
m)-B
2× H
m-C
2× H
2 m.
While selecting rotating speed to control as switching point, m platform water pump fan actual motion is at total head (or total head) H
sVthe minimum speed switching point n of Shi Jieneng
mm(H
sV) can go out engineering switching point, n with quadratic curve calculus of approximation
mm(H
sV)=A
3+ B
3× H
sV+ C
3× H
2 sV, wherein: C
3=[(
nmm(H
m)-n
mm(H
m))/(H
m-H
m)-(n
mm(H
m)-n
mm(H
sV1))/(H
m-H
sV1)]/(H
m-H
sV1)), B
3=[n
mm(H
m)-n
mm(H
m)-C
3× (H
2 m-H
2 m)]/(H
m-H
m), A
3=n
mm(H
m)-B
3× H
m-C
3× H
2 m.
Know H
mand H
mbetween any two total heads (or total head) H
sV2and H
sV3point, at H
sV2point, the energy-conservation flow switch point of m-1 platform water pump fan and m platform water pump fan is Q
m-1m(H
sV2), Q
m-1m(H
sV2) be that m-1 platform water pump fan is H at total head (or pressure)
sV2time energy-saving run allow peak rate of flow, Q
m-1m(H
sV2) corresponding m-1 platform water pump fan is H at total head (or pressure)
sV2time energy-saving run maximum (top) speed be n
m-1M(H
sV2), Q
m-1m(H
sV2) be also that m platform water pump fan is H at total head (or pressure) simultaneously
sV2time energy-saving run allow minimum discharge, Q
m-1m(H
sV2) corresponding m platform water pump fan is H at total head (or pressure)
sV2time energy-saving run minimum speed be n
mm(H
sV2), the span of m is 2 to n.At H
sV3point, the energy-conservation flow switch point of m-1 platform water pump fan and m platform water pump fan is Q
m-1m(H
sV3), Q
m-1m(H
sV3) be that m-1 platform water pump fan is H at total head (or pressure)
sV3time energy-saving run allow peak rate of flow, Q
m-1m(H
sV3) corresponding m-1 platform water pump fan is H at total head (or pressure)
sV3time energy-saving run maximum (top) speed be n
m-1M(H
sV3), Q
m-1m(H
sV3) be also that m platform water pump fan is H at total head (or pressure) simultaneously
sV3time energy-saving run allow minimum discharge, Q
m-1m(H
sV3) corresponding m platform water pump fan is H at total head (or pressure)
sV3time energy-saving run minimum speed be n
mm(H
sV3), the span of m is 2 to n.
While selecting flow to control as switching point, H
sV2and H
sV3between total head (or total head) H
sV, can show that m-1 platform water pump fan and m platform water pump fan actual motion are at total head (or total head) H with following linear relationship is approximate
sVthe flow switch point Q of Shi Jieneng
m-1m(H
sV) engineering switching point, Q
m-1m(H
sV)=Q
m-1m(H
sV3)-(Q
m-1m(H
sV3)-Q
m-1m(H
sV2)) × (H
sV3-H
sV)/(H
sV3-H
sV2).
While selecting rotating speed to control as switching point, m-1 platform water pump fan actual motion is at total head (or total head) H
sVthe maximum speed switching point n of Shi Jieneng
m-1M(H
sV) can go out engineering switching point, n with following linear relationship calculus of approximation
m-1M(H
sv)=n
m-1M(H
sV3)-(n
m-1M(H
sV3)-n
m-1M(H
sV2)) × (H
sV3-H
sV)/(H
sV3-H
sV2).
While selecting rotating speed to control as switching point, m platform water pump fan actual motion is at total head (or total head) H
sVthe minimum speed switching point n of Shi Jieneng
mm(H
sV) can go out engineering switching point, n with following linear relationship calculus of approximation
mm(H
sv)=n
mm(H
sV3)-(n
mm(H
sV3)-n
mm(H
sV2)) × (H
sV3-H
sV)/(H
sV3-H
sV2).
Know H
mand H
mbetween any three total heads (or total head) H
sV4, H
sV5and H
sV6, at H
sV4point, the energy-conservation flow switch point of m-1 platform water pump fan and m platform water pump fan is Q
m-1m(H
sV4), Q
m-1m(H
sV4) be that m-1 platform water pump fan is H at total head (or pressure)
sV4time energy-saving run allow peak rate of flow, Q
m-1m(H
sV4) corresponding m-1 platform water pump fan is H at total head (or pressure)
sV4time energy-saving run maximum (top) speed n
m-1M(H
sV4), Q
m-1m(H
sV4) be also that m platform water pump fan is H at total head (or pressure) simultaneously
sV4time energy-saving run allow minimum discharge, Q
m-1m(H
sV4) corresponding m platform water pump fan is H at total head (or pressure)
sV4time energy-saving run minimum speed n
mm(H
sV4), the span of m is 2 to n.At H
sV5point, the energy-conservation flow switch point of m-1 platform water pump fan and m platform water pump fan is Q
m-1m(H
sV5), Q
m-1m(H
sV5) be that m-1 platform water pump fan is H at total head (or pressure)
sV5time energy-saving run allow peak rate of flow, Q
m-1m(H
sV5) corresponding m-1 platform water pump fan is H at total head (or pressure)
sV5time energy-saving run maximum (top) speed n
m-1M(H
sV5), Q
m-1m(H
sV5) be also that m platform water pump fan is H at total head (or pressure) simultaneously
sV5time energy-saving run allow minimum discharge, Q
m-1m(H
sV5) corresponding m platform water pump fan is H at total head (or pressure)
sV5time energy-saving run minimum speed n
mm(H
sV5), the span of m is 2 to n.At H
sV6point, the energy-conservation flow switch point of m-1 platform water pump fan and m platform water pump fan is Q
m-1m(H
sV6), Q
m-1m(H
sV6) be that m-1 platform water pump fan is H at total head (or pressure)
sV6time energy-saving run allow peak rate of flow, Q
m-1m(H
sV6) corresponding m-1 platform water pump fan is H at total head (or pressure)
sV6time energy-saving run maximum (top) speed n
m-1M(H
sV6), Q
m-1m(H
sV6) be also that m platform water pump fan is H at total head (or pressure) simultaneously
sV6time energy-saving run allow minimum discharge, Q
m-1m(H
sV6) corresponding m platform water pump fan is H at total head (or pressure)
sV6time energy-saving run minimum speed n
mm(H
sV6), the span of m is 2 to n.
While selecting flow to control as switching point, m-1 platform water pump fan and m platform water pump fan actual motion are at total head (or total head) H
sVthe flow switch point Q of Shi Jieneng
m-1m(H
sV) can be with close engineering switching point, the Q of seemingly calculating of following quadratic curve
m-1m(H
sv)=A
1+ B
1× H
sV+ C
1× H
2 sV, wherein: C
1=[(Q
m-1m(H
sV6)-Q
m-1m(H
sV4))/(H
sV6-H
sV4)-(Q
m-1m(H
sV6)-Q
m-1m(H
sV5))/(H
sV6-H
sV5)]/(H
sV4-H
sV5)), B
1=[Q
m-1m(H
sV6)-Q
m-1m(H
sV4)-C
1× (H
2 sV6-H
2 sV4)]/(H
sV6-H
sV4), A
1=Q
m-1m(H
sV6)-B
1× H
sV6-C
1× H
2 sV6.
While selecting rotating speed to control as switching point, m-1 platform water pump fan actual motion is at total head (or total head) H
sVthe maximum speed switching point n of Shi Jieneng
m-1M(H
sV) can go out engineering switching point, n with following quadratic curve calculus of approximation
m-1M(H
sV)=A
4+ B
4× H
sV+ C
4× H
2 sV, wherein: C
4=[(n
m-1M(H
sV6)-n
m-1M(H
sV4))/(H
sV6-H
sV4)-(n
m-1M(H
sV6)-n
m-1M(H
sV5))/(H
sV6-H
sV5)]/(H
sV4-H
sV5)), B
4=[n
m-1M(H
sV6)-n
m-1M(H
sV4)-C
4× (H
2 sV6-H
2 sV4)]/(H
sV6-H
sV4), A
4=n
m-1M(H
sV6)-B
4× H
sV6-C
4× H
2 sV6.
While selecting rotating speed to control as switching point, m platform water pump fan actual motion is at total head (or total head) H
sVthe minimum speed switching point n of Shi Jieneng
mm(H
sV) can go out engineering switching point, n with following quadratic curve calculus of approximation
mm(H
sV)=A
5+ B
5× H
sV+ C
5× H
2 sV, wherein: C
5=[(n
mm(H
sV6)-n
mm(H
sV4))/(H
sV6-H
sV4)-(n
mm(H
sV6)-n
mm(H
sV5))/(H
sV6-H
sV5)]/(H
sV4-H
sV5)), B
5=[n
mm(H
sV6)-n
mm(H
sV4)-C
5× (H
2 sV6-H
2 sV4)]/(H
sV6-H
sV4), A
5=n
mm(H
sV6)-B
5× H
sV6-C
5× H
2 sV6.
If actual setpoint or actual pressure are just expressed for the outlet at water pump fan station, to consider the impact of the inlet pressure of water pump fan, because total head (or total head) refers to from exporting to the total head (or total pressure) of import, suppose that the outlet that water pump fan station needs is set as P
sV7, P
sV7converting outlet setting lift to is H
sV7, the actual outlet pressure of water pump fan is P
pV1, P
pV1converting lift to is H
pV1, the inlet pressure of water pump fan is P
e, P
econverting lift to is H
e, set total head (or total head) H
sVequal H
sV7and H
eclose, H
sV=H
sV7+ H
e, actual total head (or total head) H of water pump fan
pVequal H
pV1and H
eclose, H
pV=H
pV1+ H
e.
Power-saving running speed governing switching unit can be used as a part for speed regulator and inserts in speed regulator, power-saving running speed governing switching unit can be used as a part for PID regulator, PLC programmable controller, DCS control gear, water pump fan nonshared control unit function and inserts in PID regulator, PLC programmable controller, DCS control gear, water pump fan nonshared control unit, and power-saving running speed governing switching unit also can be used as independently water pump fan energy-saving running control device.
The invention has the beneficial effects as follows by increasing power-saving running speed governing switching unit, in meeting normal technological requirement, find economize on electricity switching point and control, mediate according to economize on electricity speed adjustment strategy, water pump fan station is operated under the state economizing on electricity most.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the routine list closed loop control block diagram of controlling water pump fan outlet pressure.
Fig. 2 increases the block diagram that after power-saving running speed governing switching unit, water pump fan outlet pressure is carried out to closed loop control.
Fig. 3 increases the block diagram that after power-saving running speed governing switching unit, non-pressure process parameter is carried out to closed loop control.
Fig. 4 is the flow diagram of power-saving running speed governing switching unit.
H in figure
sVfor pressure set points, H
efor water pump fan import additional pressure value, H
pVfor the actual pressure value of water pump fan, V
sVfor the controlled pre-set parameter beyond pressure, V
pVfor the controlled parameter actual value beyond pressure, n
sthe rotary speed regulating signal of regulon output, n
s' be the rotary speed regulating signal of power-saving running speed governing switching unit output, controller 101 is conventional controller or regulator, speed regulator 102 is common speed regulator, water pump fan 103 is controlled water pump fan, pressure transducer 104 is conventional pressure transmitter, power-saving running speed governing switching unit 105 is responsible for the power-saving running of water pump fan to carry out speed regulating control and switching controls, and sensor 106 is controlled V parameter
pvmeasuring transducer.
Embodiment
In Fig. 1, H
sVfor water pump fan outlet pressure setting value, the actual pressure of water pump fan outlet is H
pV, the H measuring when pressure transducer 104
pVlower than setting value H
sVtime, the output of controller 101 increases, and speed regulator 102 raises the rotating speed of water pump fan 103, the actual pressure H of water pump fan outlet
pVraise, the highest if the rotating speed of water pump fan 103 arrives, H
pVstill be less than H
sV, increase the operation number of units of water pump fan 103, until H
pVequal H
sV; Work as H
sVhigher than setting value H
sVtime, controller 101 produce reduction, speed regulator 102 reduces the rotating speed of water pump fan 103, the actual pressure H of water pump fan outlet
pVreduce, the highest if the rotating speed of water pump fan 103 arrives, H
pVstill higher than H
sV, reduce the operation number of units of water pump fan 103, until H
pVequal H
sV; So just make the actual outlet pressure H of water pump fan
pVremain on H
sVnear.
In Fig. 2, H
sVfor water pump fan outlet pressure setting value, the actual pressure of water pump fan outlet is H
pV, the H measuring when pressure transducer 104
pVlower than setting value H
sVtime, the output speed controlling value of controller 101 increases, and power-saving running speed governing switching unit 105 judges this rotating speed, if this rotating speed is lower than the highest power-saving running speed-changing, this rotating speed is outputed to speed regulator 102 rotating speed of water pump fan 103 is raise, the actual pressure H of water pump fan outlet
pVraise, if this rotating speed arrives the highest power-saving running speed-changing, H
pVstill be less than H
sV, increase the operation number of units of water pump fan 103, until H
pVequal H
sV; Work as H
sVhigher than setting value H
sVtime, the rotating speed producing of controller 101 reduces, and power-saving running speed governing switching unit 105 judges this rotating speed, if this rotating speed is higher than minimum power-saving running speed-changing, this rotating speed is outputed to speed regulator 102 rotating speed of water pump fan 103 is reduced, the actual pressure H of water pump fan outlet
pVreduce, if this rotating speed arrives minimum power-saving running speed-changing, H
pVstill higher than H
sV, reduce the operation number of units of water pump fan 103, until H
pVequal H
sV; So just make the actual outlet pressure H of water pump fan
pVremain on H
sVnear.Power-saving running speed governing switching unit 105 can be used as a constituent element of speed regulator and inserts in speed regulator, power-saving running speed governing switching unit 105 also can be used as PID regulator, PLC programmable controller, DCS control gear, a constituent element of water pump fan nonshared control unit is inserted PID regulator, PLC programmable controller, DCS control gear, in water pump fan nonshared control unit, power-saving running speed governing switching unit 105 also can be used as independently water pump fan operational efficiency control gear, controller 101 can be a part for speed regulator, also can be the PID regulator being independent of outside speed regulator, PLC programmable controller, DCS control gear, water pump fan nonshared control unit.
In Fig. 3, controlled parameter is not the pressure of water pump fan, and its setting value is V
sVif can obtain actual flow and the operation total head (or total head) of water pump fan, according to total head (or total head) value, power-saving running speed governing switching unit 105 draws peak rate of flow switching point and minimum discharge switching point, and controller 101 is according to setting value V
sVthe actual value V measuring with sensor 106
pVbetween difference, output speed regulated value, power-saving running speed governing switching unit 105 judges the actual flow of water pump fan, if between the peak rate of flow switching point and minimum discharge switching point of this flow in economize on electricity, this tach signal is sent in the adjustable speed water pump blower fan of all operations, if this flow greater than or equal to peak rate of flow switching point, increases the operation number of units of water pump fan 103, if this flow is less than or equal to minimum discharge switching point, reduce the operation number of units of water pump fan 103.
In Fig. 4, take pressure as controlling parameter, take rotating speed as economize on electricity switching controls point, it in dotted line frame, is power-saving running speed governing switching unit 104, the tach signal of being sent here by controller 101 and pressure high-low signal enter after power-saving running speed governing switching unit 104, judge that actual pressure is high or low than setting pressure, if high, reduce rotating speed, if arrive minimum speed-changing, reduce water pump fan 103 and move number of units, as be not less than minimum speed-changing, rate signal is sent in speed regulator 102, speed regulator 102 regulates the rotating speed of water pump fan 103; If pressure is low, increase rotating speed, as higher than the highest speed-changing, increase water pump fan 103 and move number of units, if not higher than the highest speed-changing, rate signal to be sent in speed regulator 102, speed regulator 102 regulates the rotating speed of water pump fan 103; If actual pressure equals setting pressure, maintain original water pump fan motion speed.
Those of ordinary skill in the art should be realized that, in the situation that not deviating from the spirit and scope of the present invention, can make many modifications, as use other letter to be described, change the title of term, the number of units of the water pump fan changing, change counting and form of data used, change the structure of representation, improve or reduce the power of representation, etc., obviously, those skilled in the art does not depart from design of the present invention can implement the present invention with other form, thereby other embodiment is also in the scope of the claims in the present invention.
Claims (4)
1. one kind for controlling speed governing and the changing method of water pump fan parallel-connection energy-saving operation, between the controller of conventional closed-loop control and speed regulator, increase power-saving running speed governing switch unit, it is characterized in that: speed governing and switching controls that power-saving running speed governing switch unit economizes on electricity to the operation of water pump fan, for the parallel connection of non-same model water pump fan, 1 X-type water pump fan that metered flow is less, total head or total head are H
X(1), flow is Q
1 (1)(H
X(1)), power is P
1 (1)(H
X(1)), rotating speed is n
1 (1)(H
X(1)), 1 Y type water pump fan that metered flow is larger, total head or total head are H
Y(1), flow is Q
2 (1)(H
Y(1)), power is P
2 (1)(H
Y(1)), rotating speed is n
2 (1)(H
Y(1)), power-saving running speed governing switch unit provides the optimum switching point of 1 X-type water pump fan and 1 Y type water pump fan power-saving running and is: H
X(1)=H
Y(1), Q
1 (1)(H
X(1))=Q
2 (1)(H
Y(1)), P
1 (1)(H
X(1))=P
2 (1)(H
Y(1));For the parallel connection of non-same model water pump fan, the optimum switching point that power-saving running speed governing switch unit provides m platform X-type water pump fan and i platform Y type water pump fan and m+1 platform X-type water pump fan and i platform Y type water pump fan power-saving running is: H
X(m)=H
Y(i)=H
X(m+1), Q
m(H
X(m))=Q
M+1(H
X(m+1)), P
m(H
X(m))=P
M+1(H
X(m+1)), Q
m(H
X(m))=Q
1 (m)(H
X(m))+Q
2 (m)(H
X(m))+... + Q
m (m)(H
X(m)), P
m(H
X(m))=P
1 (m)(H
X(m))+P
2 (m)(H
X(m))+... + P
M (m)(H
X(m)), Q
M+1(H
X(m+1))=Q
1 (m+1)(H
X(m+1))+Q
2 (m+1)(H
X(m+1))+... + Q
M+1 (m+1)(H
X(m+1)), P
M+1(H
X(m+1))=P
1 (m+1)(H
X(m+1))+P
2 (m+1)(H
X(m+1))+... + P
M+1 (m+1)(H
X(m+1)), Q
1 (m)(H
X(m))=Q
2 (m)(H
X(m))=...=Q
M (m)(H
X(m)), P
1 (m)(H
X(m))=P
2 (m)(H
X(m))=...=P
M (m)(H
X(m)), Q
1 (m+1)(H
X(m+1))=Q
2 (m+1)(H
X(m+1))=...=Q
M+1 (m+1)(H
X(m+1)), P
1 (m+1)(H
X(m+1))=P
2 (m+1)(H
X(m+1))=...=P
M+1 (m+1)(H
X(m+1)), Q
1 (i)(H
Y(i))=Q
2 (i)(H
Y(i))=...=Q
I (i)(H
Y(i)), P
1 (i)(H
Y(i))=P
2 (i)(H
Y(i))=...=P
I (i)(H
V(i)), the speed regulating method of economize on electricity is: n
1 (m)(H
X(m))=n
2 (m)(H
X(m))=...=n
M (m)(H
X(m)),N
1 (m+1)(H
X(m+1))=n
2 (m+1)(H
X(m+1))=...=n
M+1 (m+1)(H
X(m+1)), n
1 (i)(H
Y(i))=n
2 (i)(H
Y(i))=...=n
I (i)(H
Y(i)); For the parallel connection of non-same model water pump fan, the optimum switching point that power-saving running speed governing switch unit provides m platform X-type water pump fan and i platform Y type water pump fan and m platform X-type water pump fan and i+1 platform Y type water pump fan power-saving running is: H
X(m)=H
Y(i)=H
Y(i+1), Q
i(H
Y(i))=Q
I+1(H
Y(i+1)), P
i(H
Y(i))=P
I+1(H
Y(i+1)), Q
i(H
Y(i))=Q
1 (i)(H
Y(i))+Q
2 (i)(H
Y(i))+... + Q
I (i)(H
Y(i)), P
i(H
Y(i))=P
1 (i)(H
Y(i))+P
2 (i)(H
Y(i))+... + P
I (i)(H
Y(i)), Q
I+1(H
Y(i+1))=Q
1 (i+1)(H
Y(i+1))+Q
2 (i+1)(H
Y(i+1))+... + Q
I+1 (i+1)(H
Y(i+1)), P
I+1(H
Y(i+1))=P
1 (i+1)(H
Y(i+1))+P
2 (i+1)(H
Y(i+1))+... + P
I+1 (i+1)(H
Y(i+1)), Q
1 (i)(H
Y(i))=Q
2 (i)(H
Y(i))=...=Q
I (i)(H
Y(i)), P
1 (i)(H
Y(i))=P
2 (i)(H
Y(i))=...=P
I (i)(H
Y(i)), Q
1 (i+1)(H
Y(i+1))=Q
2 (i+1)(H
Y(i+1))=...=Q
I+1 (i+1)(H
Y(i+1)), P
1 (i+1)(H
Y(i+1))=P
2 (i+1)(H
Y(i+1))=...=P
I+1 (i+1)(H
V(i+1)), Q
1(m) (H
X(m))=Q
2(m) (H
X(m))=...=Q
M (m)(H
X(m)), P
1 (m)(H
X(m))=P
2 (m)(H
X(m))=...=P
M (m)(H
X(m)), the speed regulating method of economize on electricity is: n
1 (i)(H
Y(i))=n
2 (i)(H
Y(i))=...=n
I (i)(H
Y(i)), n
1 (i+1)(H
Y(i+1))=n
2 (i+1)(H
Y(i+1))=...=n
I+1 (i+1)(H
Y(i+1)), n
1 (m)(H
X(m))=n
2 (m)(H
X(m))=...=n
M (m)(H
X(m)), H represents total head or total head, and Q represents flow, and P represents power, and n represents rotating speed.
2. one kind for controlling speed governing and the switching method of water pump fan parallel-connection energy-saving operation, between the controller of conventional closed loop control and speed regulator, increase power-saving running speed governing switching unit, it is characterized in that: speed governing and switching controls that power-saving running speed governing switching unit economizes on electricity to the operation of water pump fan, for the parallel connection of same model water pump fan, the optimum switching point that power-saving running speed governing switching unit provides m-1 platform water pump fan and m platform water pump fan power-saving running is: H (m-1)=H (m), Q
m-1(H (m-1))=Q
m(H (m)), P
m-1(H (m-1))=P
m(H (m)), Q
m-1(H (m-1))=Q
1 (m-1)(H (m-1))+Q
2 (m-1)(H (m-1))+... + Q
m-1 (m-1)(H (m-1)), P
m-1(H (m-1))=P
1 (m-1)(H (m-1))+P
2 (m-1)(H (m-1))+... + P
m-1 (m-1)(H (m-1)), Q
m(H (m))=Q
1 (m)(H (m))+Q
2 (m)(H (m))+... + Q
m (m)(H (m)), P
m(H (m))=P
1 (m)(H (m))+P
2 (m)(H (m))+... + P
m (m)(H (m)), Q
1 (m-1)(H (m-1))=Q
2 (m-1)(H (m-1))=...=Q
m-1 (m-1)(H (m-1)), P
1 (m-1)(H (m-1))=P
2 (m-1)(H (m-1))=...=P
m-1 (m-1)(H (m-1)), Q
1 (m)(H (m))=Q
2 (m)(H (m))=...=Q
m (m)(H (m)), P
1 (m)(H (m))=P
2 (m)(H (m))=...=P
m (m)(H (m)), the speed regulating method of economize on electricity is: n
1 (m-1)(H (m-1))=n
2 (m-1)(H (m-1))=...=n
m-1 (m-1)(H (m-1)), n
1 (m)(H (m))=n
2 (m)(H (m))=...=n
m (m)(H (m)), H represents total head or total head, and Q represents flow, and P represents power, and n represents rotating speed.
3. according to claim 2 for controlling speed governing and the switching method of water pump fan parallel-connection energy-saving operation, it is characterized in that: the switching point in engineering application can be obtained as follows m-1 platform water pump fan and m platform water pump fan actual motion energy-conservation flow switch point Q in the time of total head or total head HSV
m-1m(H
sV)=Q
m-1m(H
sV3)-(Q
m-1m(H
sV3)-Q
m-1m(H
sV2)) × (H
sV3-H
sV)/(H
sV3-H
sV2); M-1 platform water pump fan actual motion is at total head or total head H
sVthe maximum speed switching point n of Shi Jieneng
m-1M(H
sV)=n
m-1M(H
sV3)-(n
m-1M(H
sV3)-n
m-1M(H
sV2)) × (H
sV3-H
sV)/(H
sV3-H
sV2); M platform water pump fan actual motion is at total head or total head H
sVthe minimum speed switching point n of Shi Jieneng
mm(H
sV)=n
mm(H
sV3)-(n
mm(H
sv
3)-n
mm(H
sV2)) × (H
sV3-H
sV)/(H
sV3-H
sV2).
4. according to claim 2 for controlling speed governing and the switching method of water pump fan parallel-connection energy-saving operation, it is characterized in that: the switching point in engineering application can be obtained as follows, and m-1 platform water pump fan and m platform water pump fan actual motion are at total head or total head H
sVthe flow switch point Q of Shi Jieneng
m-1m(H
sV)=A
1+ B
1× H
sV+ C
1× H
2 sV, wherein: C
1=[(Q
m-1m(H
sV6)-Q
m-1m(H
sV4))/(H
sV6-H
sV4)-(Q
m-
1mn (H
sV6)-Q
m-1m(H
sV5))/(H
sV6-H
sV5)]/(H
sV4-H
sV5)), B
1=[Q
m-1m(H
sV6)-Q
m-
1m(H
sV4)-C
1× (H
2 sV6-H
2 sV4)]/(H
sV6-H
sV4), A
1=Q
m-1m(H
sV6)-B
1× H
sV6-C
1× H
2 sV6; M-1 platform water pump fan actual motion is at total head or total head H
sVthe maximum speed switching point n of Shi Jieneng
m-1M(H
sV)=A
4+ B
4× H
sV+ C
4× H
2 sV, wherein: C
4=[(n
m-1M(H
sV6)-n
m-1M(H
sV4))/(H
sV6-H
sV4)-(n
m-1M(H
sV6)-n
m-1M(H
sV5))/(H
sV6-H
sV5)]/(H
sV4-H
sV5)), B
4=[n
m-1M(H
sV6)-n
m-1M(H
sV4)-C
4× (H
2 sV6-H
2 sV4)]/(H
sV6-H
sV4), A
4=n
m-1M(H
sV6)-B
4× H
sV6-C
4× H
2 sV6m platform water pump fan actual motion is at total head or total head H
sVthe minimum speed switching point n of Shi Jieneng
mm(H
sV)=A
5+ B
5× H
sV+ C
5× H
2 sV, wherein: C
5=[(n
mm(H
sV6)-n
mm(H
sV4))/(H
sV6-H
sV4)-(n
mm(H
sV6)-n
mm(H
sV5))/(H
sV6-H
sV5)]/(H
sV4-H
sVS)), B
5=[n
mm(H
sV6)-n
mm(H
sV4)-C
5× (H
2 sV6-H
2 sV4)]/(H
sV6-H
sV4), A
5=n
mm(H
sV6)-B
5× H
sV6-C
5× H
2 sV6.
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| CN101994704B (en) * | 2010-10-26 | 2012-02-15 | 浙江佳力科技股份有限公司 | Chemical process intelligent pump and control method thereof |
| CN103452824B (en) * | 2013-09-06 | 2015-12-02 | 武汉理工大学 | Based on the energy saving in fans and pumps system of the minimum power algorithm of flow-power curve |
| CN106438394B (en) * | 2016-07-30 | 2018-02-09 | 陈辉 | Water pump total head operation control method and controller, water pump |
| CN110939560B (en) | 2019-11-04 | 2021-09-14 | 姚福来 | Method for determining electricity-saving optimization operation and switching point of water pump unit |
| CN111852832B (en) * | 2020-07-16 | 2022-10-11 | 上海碳索能源服务股份有限公司 | Water cooling unit for parallel cold water system and variable station number control method of water pump |
| CN112833044A (en) * | 2021-02-18 | 2021-05-25 | 亿昇(天津)科技有限公司 | Multi-split air blower constant-pressure control system and control method |
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