CN107084139B - Fluid parameter regulating system and method - Google Patents
Fluid parameter regulating system and method Download PDFInfo
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- CN107084139B CN107084139B CN201710164422.6A CN201710164422A CN107084139B CN 107084139 B CN107084139 B CN 107084139B CN 201710164422 A CN201710164422 A CN 201710164422A CN 107084139 B CN107084139 B CN 107084139B
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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
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
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Abstract
The present invention provides a kind of fluid parameter regulating system and methods, this method comprises: fluid device, is used for trandfer fluid；Speed regulating control unit for fluid device described in soft start and makes the fluid device progressively reach oepration at full load；Transmitter is converted into corresponding electric signal for detecting the fluid parameter value of fluid parameter adjustment system output end, and by the fluid parameter value；The speed regulating control unit, be also used to according to the electric signal with fluid parameter setting value, control out-put supply frequency is adjusted by PID, and controls the fluid device using the supply frequency and runs, to update the fluid parameter value of the fluid parameter regulating system output end；Power supply, for powering for the fluid parameter regulating system.The present invention can save capable of being lost for fluid device by speed regulating control unit variable frequency adjustment fluid device.
Description
Technical field
The present invention relates to variable torque applied technical field more particularly to a kind of fluid parameter regulating systems and method.
Background technique
Variable torque (such as water pump class, fan-type, blender propeller class load) application is very extensive, and total installed capacity holds
Amount accounts for about 50% or so of industrial electrical dragging total amount, especially in metallurgy, petroleum, chemical industry, food, power generation, water supply, large-scale building
In the industries such as space air-conditioning, become that torque class load number is more, power is big, have become the general machinery equipment of these enterprises, also at
The large electricity consumer of enterprise.For this kind of equipment in initial designs, the allowance usually considered is excessive.It is provided according to design specification, wind
Machine, water pump class flow nargin be respectively 5%~10%, wind pressure, lift nargin are respectively 10%~15%.In design process very
Difficulty calculates the accurate resistance of pipe network and the various problems in view of occurring in During Process of Long-term Operation, usually always system
The foundation of maximum quantity of wind, flow and wind pressure, lift nargin as lectotype selection, but the M&S of blower, water pump is limited
, it is often just up leaned on when choosing less than suitable blower and Model of pump, it is relatively common that nargin is greater than 20~30%.
In actual operation, since nargin is larger, the flow of rated output, pressure are much larger than actual condition to this kind of equipment
Demand, do not matched that with production technology demand, to production process control be affected.The solution of traditional technology at present
It is valve or damper to be installed on the forward and backward pipeline of conveying equipment for fluid substances, by manually changing valve or damper
Aperture, the adjusting of Lai Shixian fluid parameter meets the needs of production technology with this, reaches the mesh to match with actual condition
's.In the prior art, fan delivery is adjusted using the aperture of damper, air duct plate washer or valve, the method for pump capacity,
Referred to as flow restriction control.During flow restriction control, the intrinsic operation characteristic of blower or water pump is constant, only turns down air door, baffle
Or the aperture of valve, artificially increase the resistance of pipeline, to achieve the purpose that adjust fluid parameter, thus increases pipe-line system
Energy loss is unfavorable for blower, the energy-saving run of water pump.The method of operation of this fluid system is directed at fluid device efficiency drop
It is low, cause many energy consume in vain baffle, valve resistance on, it is extremely uneconomical.
Fig. 1 is a kind of schematic diagram of fluid control flow in the prior art.As shown in Figure 1, this kind of fluid parameter adjusting side
Method includes control unit, fluid device and fluid line valve etc..Wherein, general electronic corporation element, group generally control unit: are used
At across-the-line starting, reduced voltage starting control, electrical protection systems, the starting of fluid device can only be controlled, is stopped, no adjustment equipment is negative
Lotus function；Fluid device: by three-phase AC asynchronous motor driving blower, pump class operation, fluid is exported；Fluid line valve:
For adjusting the flow or pressure of trandfer fluid.During the trandfer fluid, fluid device is operated with rated speed, at full capacity
The adjustment of fluid parameter needed for technique is realized in operation using the aperture for adjusting valve on conveyance conduit.This Traditional control skill
Art, although being able to satisfy requirement of its production technology to fluid parameter, existed to lose many energy consumptions as cost
Disadvantage: 1) fluid device is due to using across-the-line starting or reduced voltage starting, and when starting powerful device, starting current can be very big,
There is impact to power grid, line loss increases, and voltage decreases, and plant machinery abrasion increases, and reduces the service life of its equipment, increases
The maintenance load and maintenance cost of equipment；2) adjusting of fluid parameter increases the resistance of ducting or returns by the aperture of pipeline valve
The method of stream realizes, it is to lose fluid and set that the intrinsic operation characteristic of blower or water pump is constant, this adjustment control method
Standby energy, reducing device efficiency is cost；3) it can not achieve the control of the variation flow automatic regulation parameter with technological parameter
Function processed, can not achieve automation control process, and production efficiency is low.
Fig. 2 is a kind of schematic diagram of fluid control flow in the prior art.As shown in Fig. 2, this kind of fluid parameter adjusting side
Method is with adjusting method shown in FIG. 1 difference, defeated to adjust by changing fluid reflux amount using fluid return line valve
Send the flow or pressure of destination fluid.This kind of Traditional control technology wants fluid parameter although being also able to satisfy its production technology
It asks, but is also to have the disadvantage that fluid device due to using across-the-line starting or reduced voltage starting, makes big to lose energy consumption as cost
When power apparatus starts, starting current can be very big, has impact to power grid, and line loss increases, and voltage decreases, plant machinery abrasion
Increase, reduces the service life of its equipment, increase the maintenance load and maintenance cost of equipment；The adjusting of fluid parameter, is close to
The aperture of pipeline valve is flowed, changes the method for fluid reflux amount to realize, the intrinsic operation characteristic of fluid device is constant, this
Adjustment control method, and to lose the energy of fluid device, reducing device efficiency is cost；It can not achieve with technological parameter
Variation flow automatic regulation parameter control function, can not achieve automation control process, production efficiency is low.
Summary of the invention
The present invention provides a kind of fluid parameter regulating system and method, to solve in the prior art one or more lack
It loses.
The present invention provides a kind of fluid parameter regulating system, comprising: fluid device is used for trandfer fluid；Speed regulating control list
Member for fluid device described in soft start and makes the fluid device progressively reach oepration at full load；Transmitter is used for detection stream
The fluid parameter value of body parameter adjustment system output end, and corresponding electric signal is converted by the fluid parameter value；
The speed regulating control unit is also used to adjust and control by PID with fluid parameter setting value according to the electric signal
Out-put supply frequency, and control the fluid device using the supply frequency and run, system is adjusted to update the fluid parameter
The fluid parameter value of system output end；Power supply, for powering for the fluid parameter regulating system.
In one embodiment, the speed regulating control unit, be also used to control the rate of change of the supply frequency with it is described
The difference of electric signal and the fluid parameter setting value is directly proportional.
In one embodiment, the transmitter is also used to convert updated fluid parameter value to the electric signal of update；
The speed regulating control unit is also used to be adjusted according to the electric signal and the fluid parameter setting value of the update by PID and control
The supply frequency that system output updates, and control the fluid device using the update of the supply frequency of the update and run, to institute
The fluid parameter value for stating fluid parameter regulating system output end carries out closed-loop control, makes the fluid parameter regulating system output end
Fluid parameter value stablize in the fluid parameter setting value.
In one embodiment, further includes: pipeline valve, the parameter of the fluid for adjusting the fluid device conveying, with
The fluid parameter value detected.
In one embodiment, the speed regulating control unit, be also used to overload the motor in the fluid device,
Short circuit, overvoltage, under-voltage, ground connection and open-phase protection.
In one embodiment, the speed regulating control unit is also used to be arranged the fluid parameter setting value.
The present invention also provides a kind of fluid parameter adjusting methods, comprising: soft start fluid device simultaneously makes the fluid device
Progressively reach oepration at full load trandfer fluid；Detect the parameter value of fluid conveyed via the fluid device, and by the stream
The parameter value of body is converted into corresponding electric signal；According to the electric signal with fluid parameter setting value, it is defeated that control is adjusted by PID
Supply frequency out, and control the fluid device using the supply frequency and run, it is conveyed with updating via the fluid device
Fluid parameter value.
In one embodiment, the rate of change of the supply frequency and the electric signal and the fluid parameter setting value it
Difference is directly proportional.
In one embodiment, further includes: convert the parameter value of updated fluid to the electric signal of update；According to described
The electric signal of update and the fluid parameter setting value adjust the supply frequency that control output updates by PID, and described in utilization
The supply frequency of update, which updates, controls the fluid device operation, with the parameter value to the fluid conveyed via the fluid device
Closed-loop control is carried out, stablizes the parameter value of the fluid conveyed via the fluid device in the fluid parameter setting value.
In one embodiment, the parameter value of the fluid conveyed via the fluid device is detected, comprising: detection is via described
Fluid device conveys and utilizes the parameter value of the fluid of pipeline valve adjustment.
The fluid parameter regulating system and method for the embodiment of the present invention can reduce by the soft start to fluid device
Starting current reduces the impact to power grid, reduces line loss.By fed-back fluid parameter electric signal to speed regulating control unit,
And the supply frequency of control fluid device is adjusted by PID, it can be realized the automatic of fluid conveying, closed loop is adjusted, raising system
The stability of operation achievees the purpose that match with actual condition, while meeting process requirements, can be improved equipment effect
Rate reduces the output power of motor, saves electric energy.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is a kind of schematic diagram of fluid control flow in the prior art；
Fig. 2 is a kind of schematic diagram of fluid control flow in the prior art；
Fig. 3 is the structural schematic diagram of the fluid parameter regulating system of one embodiment of the invention；
Fig. 4 is the structural schematic diagram of the fluid parameter regulating system of another embodiment of the present invention；
Fig. 5 is the flow diagram of the fluid parameter adjusting method of one embodiment of the invention；
Fig. 6 is the flow diagram of the fluid parameter adjusting method of another embodiment of the present invention；
Fig. 7 is the flow diagram of the fluid parameter adjusting method of further embodiment of this invention.
Specific embodiment
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, with reference to the accompanying drawing to this hair
Bright embodiment is described in further details.Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
The present invention provides a kind of fluid parameter regulating system and changes its fluid device using sensing technology, converter technique
Revolving speed.Control is adjusted by the closed loop of fluid system, realizes the variable frequency regulating speed control to fluid device, reaches improvement system fortune
Go, improve efficiency, saving the purpose of electric energy.
Fig. 3 is the structural schematic diagram of the fluid parameter regulating system of one embodiment of the invention.As shown in figure 3, the present embodiment
Fluid parameter regulating system, it may include: power supply 111, speed regulating control unit 112, fluid device 113 and transmitter 114.
Fluid device 113 is used for trandfer fluid.Speed regulating control unit 112 is for fluid device 113 described in soft start and makes
The fluid device 113 progressively reaches oepration at full load.Transmitter 114 is for detecting fluid parameter adjustment system output end 121
Fluid parameter value, and convert corresponding electric signal for the fluid parameter value.The speed regulating control unit 112 is also used to root
According to the electric signal and fluid parameter setting value, control out-put supply frequency is adjusted by PID, and utilize the supply frequency control
It makes the fluid device 113 to run, to update the fluid parameter value of the fluid parameter regulating system output end.Power supply 111 is used
It powers in for the fluid parameter regulating system, may be, for example, speed regulating control unit 112 and transmitter 114 is powered.
Power supply 111 can be connect with the input terminal of speed regulating control unit 112.The output end of speed regulating control unit 112 can be with stream
The input terminal of body equipment 113 connects.The output end of fluid device 113 can be fluid parameter regulating system output end 121.Fluid
Parameter adjustment system output end 121 can be connect with the input terminal of transmitter 114, and the output end of transmitter 114 can be with speed regulating control
The input terminal of unit 112 connects.
In the present embodiment, the supply frequency of fluid device is controlled by speed regulating control unit, may be implemented to fluid device
Voltage carry out variable frequency adjustment and so as to avoid one from causing fluid device oepration at full load stream can be reduced as far as possible with this
The loss of body plant capacity improves the efficiency of fluid device.Pass through the stream of transmitter fed-back fluid parameter adjustment system output end
Body parameter can make speed regulating control unit preferably control fluid device operation, to meet the requirement of process fluid parameter.Pass through tune
Fast control unit soft start fluid device can reduce impact of the fluid device starting to power grid, reduce line loss, reduce equipment machine
Tool abrasion, improves the physical life of equipment.
The system of the present embodiment, soft start of the ac motor under frequency control mode have the following characteristics that motor
Starting speed it is controllable, the starting time is adjustable；Starting inertia is small, realizes smooth stepless starting, reduces starting current (generally volume
1~2 times of constant current), the impact to power grid can be reduced；Extend service life of equipment.Existing motor can be overcome directly to rise
Starting current very big (generally 5~8 times of rated current) when dynamic, reduced voltage starting and larger due to playing dynamic stress, and cause
The service life of load equipment reduces, pressure drop of grid increases, influences the disadvantages of other equipment operation.
In some embodiments, export fluid pressure or flow signal through transmitter turn be changed to standard electric signal (4~
20mA current signal or 1~5V voltage signal) feed back to speed regulating control unit 112.Speed regulating control unit 112 can be by feedback signal
The output frequency of operation output control signal control frequency converter is compared with Setting signal, to change fluid device 113
Motor speed can form a closed-loop regulating system to achieve the purpose that adjust output fluid pressure, flow.
The operation of fluid device, Ke Yishi are controlled by speed regulating control unit out-put supply frequency and using the supply frequency
Existing output voltage, frequency adjust the function of fluid device.PID is carried out by speed regulating control unit and adjusts control, may be implemented to compare
Example, integral, differential regulatory function.It may be implemented to carry out soft start to motor in fluid device by speed regulating control unit, stop
Only function.Fluid device (variable torque) may include three-phase alternating-current motor, can be with driving equipment (such as water pump class, blower
Class) rotation speed-regulating function, drive revolving speed that can change, i.e. revolving speed n=60f/p with the variation of supply frequency, wherein n is revolving speed,
F is supply frequency, and p is motor number of pole-pairs.Transmitter, which can have, is converted into corresponding current signal or electricity for fluid parameter
Press signal output function.Transmitter can be sensing transducer.Above-mentioned fluid parameter setting value can be required fluids process
Parameter.The electric signal can be voltage signal or current signal.Fluid parameter for example can be flow, pressure etc..
In some embodiments, the speed regulating control unit 112 can also be used to controlling the rate of change of the supply frequency with
The difference of the electric signal and the fluid parameter setting value is directly proportional.With this, variable frequency adjustment preferably can be carried out to fluid device.
In some embodiments, the transmitter 114 can also be used in the electricity for converting updated fluid parameter value to update
Signal.The speed regulating control unit 112 can also be used to be passed through according to the electric signal and the fluid parameter setting value of the update
PID adjusts control and exports the supply frequency updated, and is updated using the supply frequency of the update and control the fluid device fortune
Row carries out closed-loop control with the fluid parameter value to the fluid parameter regulating system output end, adjusts the fluid parameter
The fluid parameter value of system output is stablized in the fluid parameter setting value.In the present embodiment, it may be implemented to fluid device
The closed-loop control that PID is adjusted, so as to realize that closed loop that is continuous, stablizing fluid parameter value needed for exporting technique is adjusted.
Fig. 4 is the structural schematic diagram of the fluid parameter regulating system of another embodiment of the present invention.As shown in figure 4, shown in Fig. 3
Fluid parameter regulating system may also include pipeline valve 115.Pipeline valve 115 is used to adjust the stream of the fluid device conveying
The parameter of body, with the fluid parameter value detected.In the present embodiment, the aperture by adjusting pipeline valve can be with convection current
The parameter of the fluid of body equipment conveying is made further to adjust, such as adjusts flow pressure, can be improved needed for reaching technique with this
The speed of fluid parameter, it may also be used for pipe-line system maintenance, distribution etc..
In some embodiments, the speed regulating control unit 112 can also be used in the motor in the fluid device 113 into
Row overload, short circuit, overvoltage, under-voltage, ground connection and open-phase protection.By setting speed regulating control unit have electromotor overload,
The defencive functions such as short circuit, overvoltage, under-voltage, ground connection, phase shortage can prevent the motor in fluid device to be damaged, prolong
Long electrical motor service life.
In some embodiments, the speed regulating control unit 112 can also be used to that the fluid parameter setting value be arranged.The fluid
Pre-set parameter can be determined according to the fluid parameter needed for technique.It is defeated with the fluid that this may be implemented to automatically control fluid device
It send, improves the stability of system operation, achieve the purpose that match with actual condition.
In some embodiments, the speed regulating control unit 112 can have digital quantity, the input of analog quantity (I/O) point, output work
Energy.
In one embodiment, speed regulating control unit has output voltage, frequency regulation function；It is set with fluid parameter
Function；With ratio, integral, differential (PID) regulatory function；With digital quantity, the input of analog quantity (I/O) point, output function；Tool
There is flexible starter for electric motor, stop function；Function is protected with electromotor overload, short circuit, overvoltage, under-voltage, ground connection, phase shortage etc.
Energy.Wherein, digital quantity, that is, switching value can be used for realizing switching function.Analog quantity for example may include that voltage, electric current, temperature etc. connect
The amount of continuous variation.It may include the adjuster with PID function, programmable controller (PLC), frequency conversion tune in speed regulating control unit
Fast device, power supply control circuit etc..
The fluid parameter regulating system of the embodiment of the present invention passes through the soft start of speed regulating control cellular convection body equipment, energy
Starting current is enough reduced, the impact to power grid is reduced, reduces line loss.Pass through transmitter fed-back fluid parameter electric signal to tune
Fast control unit, and the supply frequency for controlling fluid device is adjusted by speed regulating control unit PID, it can be realized fluid conveying
Automatically, closed loop is adjusted, and is improved the stability of system operation, is achieved the purpose that match with actual condition, meeting process requirements
While, it can be improved device efficiency, reduce the output power of motor, save electric energy.
Based on inventive concept identical with fluid parameter regulating system shown in Fig. 3, the present invention also provides a kind of fluid ginsengs
Number adjusting method.The above-mentioned fluid parameter regulating system that is referred to of fluid parameter adjusting method is implemented, and it is no longer superfluous to repeat place
It states.
Fig. 5 is the flow diagram of the fluid parameter adjusting method of one embodiment of the invention.As shown in figure 5, the present embodiment
Fluid parameter adjusting method, it may include step:
S210: soft start fluid device simultaneously makes the fluid device progressively reach oepration at full load trandfer fluid；
S220: the parameter value for the fluid that detection is conveyed via the fluid device, and the parameter value of the fluid is converted
For corresponding electric signal；
S230: according to the electric signal with fluid parameter setting value, control out-put supply frequency, and benefit are adjusted by PID
The fluid device operation is controlled with the supply frequency, to update the parameter value of the fluid conveyed via the fluid device.
In the present embodiment, by controlling the supply frequency of fluid device, it may be implemented to become the voltage of fluid device
Frequency modulation section can reduce fluid device energy so as to avoid one from causing fluid device oepration at full load with this as far as possible
Loss, improves the efficiency of fluid device.By the fluid parameter of fed-back fluid parameter adjustment system output end, speed regulating control can be made
Unit preferably controls fluid device operation, to meet the requirement of process fluid parameter.By soft start fluid device, can subtract
Small fluid device starts the impact to power grid, reduces line loss, reduces plant machinery abrasion, improves the physical life of equipment.
In some embodiments, the rate of change of the supply frequency and the electric signal and the fluid parameter setting value it
Difference is directly proportional.With this, variable frequency adjustment preferably can be carried out to fluid device.
Fig. 6 is the flow diagram of the fluid parameter adjusting method of another embodiment of the present invention.As shown in fig. 6, shown in Fig. 5
Fluid parameter adjusting method, may further comprise the step of:
S240: the parameter value of updated fluid is converted to the electric signal of update；
S250: control output is adjusted by PID according to the electric signal of the update and the fluid parameter setting value and is updated
Supply frequency, and updated using the supply frequency of the update and to control the fluid device and run, to via the fluid
The parameter value of the fluid of equipment conveying carries out closed-loop control, stablizes the parameter value of the fluid conveyed via the fluid device
The fluid parameter setting value.
In the present embodiment, the closed-loop control adjusted to fluid device PID may be implemented, it is continuous, stable so as to realize
The closed loop of fluid parameter value needed for exporting technique is adjusted.
In some embodiments, the method for detecting the parameter value of the fluid conveyed via the fluid device, specific embodiment party
Formula can are as follows: detection conveys via the fluid device and utilize the parameter value of the fluid of pipeline valve adjustment.In the present embodiment, lead to
The aperture for overregulating pipeline valve can be made further to adjust to the parameter for the fluid that fluid device conveys, and can be improved and reach with this
To the speed of fluid parameter needed for technique.
Fig. 7 is the flow diagram of the fluid parameter adjusting method of further embodiment of this invention.As shown in fig. 7, of the invention
The fluid parameter adjusting method of embodiment, it may include:
S310: according to the demand of production technology, in speed regulating control unit, parameter needed for setting output fluid is given
Value.
S320: operating instruction is issued to speed regulating control unit, soft start runner fluid device progressively reaches oepration at full load.
The fluid device may, for example, be pump, blower etc..At this point, in system seldom without fluid or amount, fluid device can be made to progressively reach
Oepration at full load.
S330: with the passage of fluid device time of delivery, system end sensing transducer detects fluid parameter value
Variation in time feeds back signal to speed regulating control unit.
S340: speed regulating control unit receives the feedback signal of sensing transducer and setting value is compared operation, PID tune
Section control out-put supply frequency, the rate of change of frequency are directly proportional to comparison signal difference.
S350: fluid parameter finally makes fluid output parameter value by the closed-loop control for constantly sampling, comparing, adjusting
Stablize in the range required for technique.
In the present embodiment, with existing frequency conversion control technique, sensing technology, according to production technology to fluid parameter (such as
Flow, pressure) need to set fluid parameter output valve, using the sensor for being mounted on output end, output signal value is fed back
Operation is compared with setting value to speed regulating control unit, PID adjusts control, speed regulating control unit output speed regulating control signal
(frequency), the revolving speed of control adjustment fluid device, changes fluid output parameter value with the variation of revolving speed, to reach company
Closed loop that is continuous, stablizing parameter value needed for exporting technique is adjusted.Controlling of production process process is not only improved, system automation is improved
Level, and a large amount of power consumptions have been saved, reduce production run cost.
Variable torque speed regulating control economize on electricity foundation:
Variable torque (fluid device) shaft power has proportionate relationship as shown in Table 1 with adjusting door aperture.By table 1
It is defeated when can be seen that the output flow of valve opening and fluid device, the proportionate relationship of output power, such as valve opening are 50%
Outflow is 80%, and output power is 94%/98%.
| Flow (%) | It adjusts door aperture (100%) | Entrance door controls shaft power (%) | Outlet portal controls shaft power (%) |
| 100 | 100 | 100 | 100 |
| 90 | 73 | 94 | 98 |
| 80 | 50 | 88 | 94 |
| 70 | 40 | 82 | 91 |
| 60 | 30 | 76 | 85 |
| 50 | 25 | 70 | 81 |
| 40 | 20 | 64 | 74 |
| 30 | 13 | 58 | 67 |
| 20 | 10 | 52 | 58 |
1 fluid device shaft power of table and adjusting door aperture proportionate relationship
Fluid flow is adjusted using valve opening, the method for pressure has the phenomenon that waste electric energy.Pass through valve opening
Come when adjusting fluid flow, the output power down ratio of fluid device is simultaneously few, as shown in table 1, when flow is reduced to 50%,
The output power of fluid device only drops to 81%.According to theoretical calculation, when blower, water pump revolving speed from N1Become N2When, flow
Q, lift H, the theoretic variation relation of shaft power P are as follows:
Q2=Q1(N2/N1)
H2=H1(N2/N1)2
P2=P1(N2/N1)3
Wherein, Q1Expression revolving speed is N1When air quantity (flow), Q2Expression revolving speed is N2When air quantity (flow), H1It indicates to turn
Speed is N1When wind pressure (lift), H2Expression revolving speed is N2When wind pressure (lift), P1Expression revolving speed is N1When fan shaft power,
P2Expression revolving speed is N2When fan shaft power.
From the above equation, we can see that blower or pump capacity are directly proportional to the first power of revolving speed, the quadratic power of pressure and revolving speed is at just
Than, and shaft power is directly proportional to the cube of revolving speed.Thus, ideally, flow, pressure/lift, revolving speed and shaft power
Relationship is as shown in table 2.As can be seen from Table 1, the revolving speed of variable torque is directly proportional to output fluid flow and exports fluid pressure
Power it is square directly proportional, cube directly proportional to output power, for example, when the revolving speed decline 50% of variable torque, output
Flow is also 50%, output pressure 25%, and output power is 12.5%.Its energy-saving effect ratio is obtained with valve regulated effect master
It is more.
| Flow (%) | Pressure (lift) (%) | Revolving speed (%) | Shaft power (%) |
| 100 | 100 | 100 | 100 |
| 90 | 81 | 90 | 72.9 |
| 80 | 64 | 80 | 51.2 |
| 70 | 49 | 70 | 34.3 |
| 60 | 36 | 60 | 21.6 |
| 50 | 25 | 50 | 12.5 |
Relationship between 2 ideal situation down-off of table, pressure/lift, revolving speed and shaft power
It is directed to actual production process operation operating condition using the present invention it can be seen from above-mentioned comparison, changes fluid device
Revolving speed to achieve the purpose that adjust technological parameter, can improve equipment runnability, improve equipment operating efficiency, save electricity
Energy.
Become torque (fluid class) equipment, adjusts flow, pressure using valve regulated flow, pressure and using equipment speed regulation
Shaft power comparison:
1) respective motor shaft power P when using plate washer, valve regulated flow, pressureGearWith the relationship of flow Q are as follows:
PGear≈(0.4+0.6Q)*Pe (1)
Wherein, 0.4 and 0.6 be empirical theory calculate coefficient.
2) respective motor shaft power P when adjusting flow, pressure using speed regulationBecomeWith the relationship of flow Q are as follows:
PBecome≈Q3Ple≈N3Pe (2)
Wherein, motor reel power (kW) when Ple is valve wide open, rated speed, metered flow, N is motor speed, Q
For flow.
In one embodiment, certain centrifugal fan, motor rated power 245KW, 4 pole motors, reality are with air quantity
60% nominal air delivery will be adjusted air quantity by original air door and transform frequency control adjusting as, and interpretation of result is as follows:
Electrical consumption power is (by (1) formula) when adjusting air quantity with the air door of the prior art:
PGear≈(0.4+0.6Q)*Ple
=(0.4+0.6*60%) * 245
=0.76*245
=186.2 (KW)
Shaft power is the 186.2/245*100%=76% of rated power, is consistent with table 1.
Electrical consumption power is (by (2) formula) when adjusting air quantity with frequency control of the invention:
PBecome≈Q3Ple≈N3Ple
=0.63Ple
=0.216*245
=52.9 (KW)
Shaft power is the 52.9/245*100%=21.6% of rated power, is consistent with table 2.
Electrical power is saved when using variable frequency adjustment of the invention than adjusting air quantity using the air door of the prior art:
(186.2-52.9=133.3 KW)
Year amount of electricity saving, annual to be calculated by 300 days:
24 × 300 × 133.3=959760KWh
The Spring Festival holidays electricity charge (0.60 yuan/kWh of electricity price):
Ten thousand yuan of 0.6 × 959760=57
Power saving rate are as follows:
PGear-PBecome/PGear* 100%
=186.2-52.9/186.2*100%
=71.6%
It can be seen that blower fan water pump class variable torque by the above analytical calculation, after frequency control of the invention,
Power savings are it will be apparent that in addition, after mechanical revolving speed reduction, and mechanical abrasion is reduced, and service life extends, and are passed through indirectly
Benefit of helping is also very considerable.
The fluid parameter adjusting method of the embodiment of the present invention can reduce starting electricity by the soft start to fluid device
Stream reduces the impact to power grid, reduces line loss.By fed-back fluid parameter electric signal to speed regulating control unit, and pass through
PID adjusts the supply frequency of control fluid device, can be realized the automatic of fluid conveying, closed loop adjusting, improves system operation
Stability achievees the purpose that match with actual condition, while meeting process requirements, can be improved device efficiency, reduces
The output power of motor saves electric energy.
In the description of this specification, reference term " one embodiment ", " specific embodiment ", " some implementations
Example ", " such as ", the description of " example ", " specific example " or " some examples " etc. mean it is described in conjunction with this embodiment or example
Particular features, structures, materials, or characteristics are included at least one embodiment or example of the invention.In the present specification,
Schematic expression of the above terms may not refer to the same embodiment or example.Moreover, the specific features of description, knot
Structure, material or feature can be combined in any suitable manner in any one or more of the embodiments or examples.Each embodiment
Involved in the step of sequence be used to schematically illustrate implementation of the invention, sequence of steps therein is not construed as limiting, can be as needed
It appropriately adjusts.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (6)
1. a kind of fluid parameter regulating system characterized by comprising
Fluid device is used for trandfer fluid；
Speed regulating control unit for fluid device described in soft start and makes the fluid device progressively reach oepration at full load；
Transmitter is converted for detecting the fluid parameter value of fluid parameter adjustment system output end, and by the fluid parameter value
For corresponding electric signal；For converting updated fluid parameter value to the electric signal of update；
The speed regulating control unit is also used to adjust control output by PID with fluid parameter setting value according to the electric signal
Supply frequency, and control the fluid device using the supply frequency and run, it is defeated to update the fluid parameter regulating system
The fluid parameter value of outlet；Rate of change for controlling the supply frequency is set with the electric signal and the fluid parameter
The difference of value is directly proportional；For adjusting control output by PID according to the electric signal and the fluid parameter setting value of the update
The supply frequency of update, and updated using the supply frequency of the update and control the fluid device operation, to the fluid
The fluid parameter value of parameter adjustment system output end carries out closed-loop control, makes the fluid of the fluid parameter regulating system output end
Parameter value is stablized in the fluid parameter setting value；
Power supply, for powering for the fluid parameter regulating system.
2. fluid parameter regulating system as described in claim 1, which is characterized in that further include:
Pipeline valve, the parameter of the fluid for adjusting the fluid device conveying, with the fluid parameter value detected.
3. fluid parameter regulating system as described in claim 1, which is characterized in that the speed regulating control unit is also used to pair
Motor in the fluid device overloaded, short circuit, overvoltage, under-voltage, ground connection and open-phase protection.
4. fluid parameter regulating system as described in claim 1, which is characterized in that the speed regulating control unit is also used to set
Set the fluid parameter setting value.
5. a kind of fluid parameter adjusting method characterized by comprising
Soft start fluid device simultaneously makes the fluid device progressively reach oepration at full load trandfer fluid；
The parameter value of the fluid conveyed via the fluid device is detected, and converts corresponding electricity for the parameter value of the fluid
Signal；
According to the electric signal with fluid parameter setting value, control out-put supply frequency is adjusted by PID, and utilizes the power supply
Frequency controls the fluid device operation, to update the parameter value of the fluid conveyed via the fluid device；Wherein, the electricity
The difference of the rate of change of source frequency and the electric signal and the fluid parameter setting value is directly proportional；
Convert the parameter value of updated fluid to the electric signal of update；
The power supply frequency that control output updates is adjusted by PID according to the electric signal of the update and the fluid parameter setting value
Rate, and updated using the supply frequency of the update and control the fluid device operation, to be conveyed to via the fluid device
Fluid parameter value carry out closed-loop control, make via the fluid device convey fluid parameter value stablize in the fluid
Pre-set parameter.
6. fluid parameter adjusting method as claimed in claim 5, which is characterized in that detection was conveyed via the fluid device
The parameter value of fluid, comprising:
Detection conveys via the fluid device and utilizes the parameter value of the fluid of pipeline valve adjustment.
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| CN201710164422.6A CN107084139B (en) | 2017-03-20 | 2017-03-20 | Fluid parameter regulating system and method |
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| CN201710164422.6A CN107084139B (en) | 2017-03-20 | 2017-03-20 | Fluid parameter regulating system and method |
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| CN109653844A (en) * | 2018-12-27 | 2019-04-19 | 凯龙高科技股份有限公司 | A kind of control method that urea liquid supply pump pressure is stable |
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