CN107084139A - Fluid parameter regulating system and method - Google Patents
Fluid parameter regulating system and method Download PDFInfo
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- CN107084139A CN107084139A CN201710164422.6A CN201710164422A CN107084139A CN 107084139 A CN107084139 A CN 107084139A CN 201710164422 A CN201710164422 A CN 201710164422A CN 107084139 A CN107084139 A CN 107084139A
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- fluid
- parameter
- fluid parameter
- fluid device
- electric signal
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
Abstract
The invention provides a kind of fluid parameter regulating system and method, this method includes：Fluid device, 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, the fluid parameter value for detecting fluid parameter adjustment system output end, and the fluid parameter value is converted into corresponding electric signal；The speed regulating control unit, it is additionally operable to according to the electric signal and fluid parameter setting value, the fluid device operation is controlled by PID regulation control out-put supply frequencies, and using the supply frequency, to update the fluid parameter value of the fluid parameter regulating system output end；Power supply, for being powered for the fluid parameter regulating system.The present invention can save 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 system and method.
Background technology
Variable torque (such as water pump class, fan-type, mixer propeller class load) application is quite varied, and total installed capacity holds
Amount accounts for 50% or so of industrial electrical dragging total amount, especially in metallurgy, oil, chemical industry, food, generating, water supply, large-scale building
In the industries such as space air-conditioning, become that torque class load number is more, power greatly, have become the general machinery equipment of these enterprises, also into
The large electricity consumer of enterprise.This kind equipment is in initial designs, and the allowance generally considered is excessive.Provided according to design specification, wind
Machine, the flow nargin of water pump class are respectively 5%~10%, and blast, 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, generally always system
Maximum quantity of wind, flow and blast, lift nargin are as the foundation of lectotype selection, but the M＆S of blower fan, water pump is limited
, often just up leaned on when choosing less than suitable blower fan and Model of pump, it is relatively common that nargin is more than 20~30%.
This kind equipment is in actual motion, because nargin is larger, and flow, the pressure of its rated output are much larger than actual condition
Demand, do not matched that with production technology demand, on production process control influence it is larger.The solution of current conventional art
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, to realize the regulation of fluid parameter, the demand of production technology is met with this, the mesh matched with actual condition is reached
's.In the prior art, fan delivery is adjusted using the aperture of damper, air channel 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 fan or water pump is constant, only turn down air door, baffle plate
Or the aperture of valve, artificially increase the resistance of pipeline, to reach the purpose of regulation fluid parameter, thus increase pipe-line system
Energy loss, is unfavorable for blower fan, 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 to consume in vain on baffle plate, the resistance of valve, 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 regulation side
Method includes control unit, fluid device and fluid line valve etc..Wherein, control unit：It is general to use general electronic corporation element, group
Into 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 born
Lotus function；Fluid device：By three-phase AC asynchronous motor driving blower fan, the operation of pump class, fluid is exported；Fluid line valve：
Flow or pressure for adjusting trandfer fluid.During the trandfer fluid, fluid device is operated with rated speed, at full capacity
Operation, using the aperture of valve on regulation conveyance conduit come the adjustment of fluid parameter needed for realizing technique.This Traditional control skill
Art, although can meet requirement of its production technology to fluid parameter, still, it is, to lose many energy consumptions as cost, to exist
Shortcoming：1) fluid device is due to using across-the-line starting or reduced voltage starting, when starting powerful device, and starting current can be very big,
There is impact to power network, line loss increase, voltage decreases, plant machinery abrasion increase reduces the service life of its equipment, increased
The maintenance load and maintenance cost of equipment；2) regulation of fluid parameter, by the aperture of pipeline valve, increases the resistance of ducting or returns
The method of stream realizes, the intrinsic operation characteristic of its blower fan or water pump is constant, this adjustment control method, is set with losing fluid
Standby energy, reduction device efficiency is cost；3) control of the change flow automatic regulation parameter with technological parameter can not be realized
Function processed, it is impossible to realize Automated condtrol flow, low production efficiency.
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 regulation side
Method is that it is defeated to adjust to change fluid reflux amount by using fluid return line valve with the adjusting method difference shown in Fig. 1
Send the flow or pressure of destination fluid.This kind of Traditional control technology, although can also meet its production technology and be wanted to fluid parameter
Ask, but be also, to lose energy consumption as cost, there is shortcoming：Fluid device makes big due to using across-the-line starting or reduced voltage starting
When power apparatus is started, starting current can be very big, there is impact to power network, and line loss increase, voltage decreases, plant machinery abrasion
Increase, reduces the service life of its equipment, increases the maintenance load and maintenance cost of equipment；The regulation 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 its fluid device is constant, this
Adjustment control method, is also that, to lose the energy of fluid device, reduction device efficiency is cost；It can not realize with technological parameter
Change flow automatic regulation parameter control function, it is impossible to realize Automated condtrol flow, low production efficiency.
The content of the invention
The present invention provides a kind of fluid parameter regulating system and method, is lacked with solving one or more of the prior art
Lose.
The present invention provides a kind of fluid parameter regulating system, including：Fluid device, 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, for detection stream
The fluid parameter value of body parameter adjustment system output end, and the fluid parameter value is converted into corresponding electric signal；
The speed regulating control unit, is additionally operable to according to the electric signal and fluid parameter setting value, is adjusted and controlled by PID
Out-put supply frequency, and the fluid device operation is controlled using the supply frequency, it is to update the fluid parameter regulation
The fluid parameter value for output end of uniting；Power supply, for being powered for the fluid parameter regulating system.
In one embodiment, the speed regulating control unit, be additionally operable 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 additionally operable to the fluid parameter value after renewal being converted into the electric signal of renewal；
The speed regulating control unit, is additionally operable to be adjusted by PID according to the electric signal and the fluid parameter setting value of the renewal and controls
The supply frequency that system output updates, and the control fluid device operation is updated using the supply frequency of the renewal, with 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 stabilization in the fluid parameter setting value.
In one embodiment, in addition to：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 additionally operable 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 additionally operable to set the fluid parameter setting value.
The present invention also provides a kind of fluid parameter adjusting method, including：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 by the stream
The parameter value of body is converted into corresponding electric signal；It is defeated by PID regulation controls according to the electric signal and fluid parameter setting value
Go out supply frequency, and the fluid device operation is controlled using the supply frequency, 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, in addition to：The parameter value of fluid after renewal is converted into the electric signal of renewal；According to described
The electric signal of renewal and the fluid parameter setting value adjust the supply frequency that control output updates by PID, and utilize described
The supply frequency of renewal updates the control fluid device operation, with the parameter value to the fluid conveyed via the fluid device
Closed-loop control is carried out, makes the parameter value stabilization 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, including：Detection is via described
Fluid device conveys and utilized the parameter value of the fluid of pipeline valve adjustment.
The fluid parameter regulating system and method for the embodiment of the present invention, by the soft start to fluid device, can be reduced
Starting current, reduces the impact to power network, reduces line loss.By fed-back fluid parameter electric signal to speed regulating control unit,
And the supply frequency for controlling fluid device is adjusted by PID, automatic, the closed loop regulation of fluid conveying can be realized, system is improved
The stability of operation, reaches the purpose matched with actual condition, while process requirements are met, it is possible to increase equipment is imitated
Rate, reduces the power output of motor, saves electric energy.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying 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 representation of the fluid parameter regulating system of one embodiment of the invention；
Fig. 4 is the structural representation of the fluid parameter regulating system of another embodiment of the present invention；
Fig. 5 is the schematic flow sheet of the fluid parameter adjusting method of one embodiment of the invention；
Fig. 6 is the schematic flow sheet of the fluid parameter adjusting method of another embodiment of the present invention；
Fig. 7 is the schematic flow sheet of the fluid parameter adjusting method of further embodiment of this invention.
Embodiment
For the purpose, technical scheme and advantage of the embodiment of the present invention are more clearly understood, below in conjunction with the accompanying drawings to this hair
Bright embodiment is described in further details.Here, the schematic description and description of the present invention is 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, using sensing technology, converter technique, changes its fluid device
Rotating speed.Control is adjusted by the closed loop of fluid system, the variable frequency regulating speed control to fluid device is realized, reaches that improvement system is transported
Row, the purpose for improving efficiency, saving electric energy.
Fig. 3 is the structural representation 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 used for fluid device 113 described in soft start and made
The fluid device 113 progressively reaches oepration at full load.Transmitter 114 is used to detect fluid parameter adjustment system output end 121
Fluid parameter value, and the fluid parameter value is converted into corresponding electric signal.The speed regulating control unit 112 is additionally operable to root
According to the electric signal and fluid parameter setting value, by PID regulation control out-put supply frequencies, and the supply frequency control is utilized
Make 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
Powered in for the fluid parameter regulating system, for example, can be that speed regulating control unit 112 and transmitter 114 are powered.
Power supply 111 can be connected with the input of speed regulating control unit 112.The output end of speed regulating control unit 112 can be with stream
The input connection of body equipment 113.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 connected with the input of transmitter 114, and the output end of transmitter 114 can be with speed regulating control
The input connection of unit 112.
In the present embodiment, the supply frequency of fluid device is controlled by speed regulating control unit, it is possible to achieve to fluid device
Voltage carry out variable frequency adjustment, 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 better control over fluid device operation, to meet the requirement of process fluid parameter.By adjusting
Fast control unit soft start fluid device, can reduce impact of the fluid device startup to power network, reduce line loss, reduce equipment machine
Tool weares and teares, and improves the physical life of equipment.
The system of the present embodiment, soft start of the ac motor under VFC pattern has the characteristics that：Motor
Starting speed it is controllable, the starting time is adjustable；Starting inertia is small, realizes smooth stepless startup, and reduction starting current (is generally volume
Determine 1~2 times of electric current), it is possible to decrease the impact to power network；Extension device service life.Existing motor can be overcome directly to rise
Starting current very big (generally 5~8 times of rated current) during dynamic, reduced voltage starting and larger due to playing dynamic stress, and cause
The shortcomings of service life reduction of load equipment, pressure drop of grid increase, influence miscellaneous equipment are run.
In some embodiments, export fluid pressure or flow signal through transmitter turn be changed to standard electric signal (4~
20mA current signals or 1~5V voltage signals) feed back to speed regulating control unit 112.Speed regulating control unit 112 can be by feedback signal
The output frequency that computing output control signal controls frequency converter is compared with Setting signal, so as to change fluid device 113
Motor speed, so as to reach regulation output fluid pressure, the purpose of flow, can form a closed-loop regulating system.
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 regulation controls are carried out by speed regulating control unit, it is possible to achieve ratio
Example, integration, differential regulatory function.It can be realized by speed regulating control unit and soft start is carried out to motor in fluid device, is stopped
Only function.Fluid device (variable torque) can include three-phase alternating-current motor, can be with driving equipment (such as water pump class, blower fan
Class) rotation speed-regulating function, drive rotating speed to change with the change of supply frequency, i.e. rotating speed n=60f/p, wherein, n is rotating speed,
F is supply frequency, and p is motor number of pole-pairs.Transmitter, which can have, is converted into fluid parameter corresponding current signal or electricity
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 is such as can be flow, pressure.
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 be additionally used in the electricity that the fluid parameter value after renewal is converted into renewal
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 renewal
The supply frequency that PID regulation control outputs update, and update the control fluid device fortune using the supply frequency of the renewal
OK, to carry out closed-loop control to the fluid parameter value of the fluid parameter regulating system output end, adjust the fluid parameter
The fluid parameter value stabilization of system output is in the fluid parameter setting value.In the present embodiment, it is possible to achieve to fluid device
The closed-loop control of PID regulations, so as to the closed loop regulation of fluid parameter value needed for realizing continuous, stable output technique.
Fig. 4 is the structural representation 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 for the stream for adjusting the fluid device conveying
The parameter of body, with the fluid parameter value detected., can be with convection current by the aperture for adjusting pipeline valve in the present embodiment
The parameter of the fluid of body equipment conveying makees further regulation, for example, adjust flow pressure, can be improved with this needed for reaching technique
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 to enter the motor in the fluid device 113
Row overload, short circuit, overvoltage, under-voltage, ground connection and open-phase protection.By set 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 set the fluid parameter setting value.The fluid
Pre-set parameter can be according to needed for technique fluid parameter determine.It can realize that the fluid for automatically controlling fluid device is defeated with this
Send, improve the stability of system operation, reach the purpose matched 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, with output voltage, frequency regulation function；With fluid parameter setting
Function；With ratio, integration, 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；Work(is protected with electromotor overload, short circuit, overvoltage, under-voltage, ground connection, phase shortage etc.
Energy.Wherein, digital quantity is switching value, available for realizing switching function.Analog quantity connects such as may include voltage, electric current, temperature
The amount of continuous change.The adjuster with PID functions, programmable controller (PLC) can be included in speed regulating control unit, becomes frequency modulation
Fast device, power supply control loop 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, reduces the impact to power network, line loss is reduced.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, fluid conveying can be realized
Automatically, closed loop is adjusted, and is improved the stability of system operation, is reached the purpose matched with actual condition, meeting process requirements
While, it is possible to increase device efficiency, reduces the power output of motor, saves electric energy.
Based on the fluid parameter regulating system identical inventive concept shown in Fig. 3, the present invention also provides a kind of fluid ginseng
Number adjusting method.The above-mentioned fluid parameter regulating system that is referred to of fluid parameter adjusting method is implemented, and repeats part and no longer goes to live in the household of one's in-laws on getting married
State.
Fig. 5 is the schematic flow sheet 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 of the fluid conveyed via the fluid device is detected, and the parameter value of the fluid is converted
For corresponding electric signal；
S230：According to the electric signal and fluid parameter setting value, out-put supply frequency, and profit are controlled by PID regulations
The fluid device is controlled to run with the supply frequency, to update the parameter value of the fluid conveyed via the fluid device.
In the present embodiment, by the supply frequency for controlling fluid device, it is possible to achieve the voltage of fluid device is become
Frequency modulation section, so as to avoid one from causing fluid device oepration at full load, fluid device energy can be reduced as far as possible with this
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 better controls over fluid device operation, to meet the requirement of process fluid parameter.By soft start fluid device, it can subtract
Small fluid device starts the impact to power network, 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 schematic flow sheet 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 also include step：
S240：The parameter value of fluid after renewal is converted into the electric signal of renewal；
S250：Updated according to the electric signal of the renewal and the fluid parameter setting value by PID regulation control outputs
Supply frequency, and control fluid device operation is updated using the supply frequency of the renewal, with to via the fluid
The parameter value of the fluid of equipment conveying carries out closed-loop control, the parameter value stabilization of the fluid conveyed via the fluid device is existed
The fluid parameter setting value.
It is continuous, stably so as to realize in the present embodiment, it is possible to achieve the closed-loop control adjusted to fluid device PID
The closed loop regulation of fluid parameter value needed for exporting technique.
In some embodiments, the method for detecting the parameter value of the fluid conveyed via the fluid device, specific embodiment party
Formula can be：Detection conveys and utilized the parameter value of the fluid of pipeline valve adjustment via the fluid device.In the present embodiment, lead to
The parameter for overregulating the fluid that the aperture of pipeline valve can be conveyed to fluid device makees further regulation, can be improved and reached with this
The speed of fluid parameter needed for technique.
Fig. 7 is the schematic flow sheet 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 is given needed for setting output fluid
Value.
S320：Operating instruction is sent 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 fan etc..Now, it is seldom without fluid or amount in system, fluid device can be progressively reached
Oepration at full load.
S330：With the passage of fluid device time of delivery, system end sensing transducer detects fluid parameter value
Change, feeds back to speed regulating control unit by signal in time.
S340：Speed regulating control unit receives the feedback signal of sensing transducer and setting value is compared computing, and PID is adjusted
Section control out-put supply frequency, the rate of change of frequency is directly proportional to comparison signal difference.
S350：Fluid parameter is by constantly sampling, comparing, the closed-loop control of regulation, finally makes fluid output parameter value
Stabilization is in the scope required for technique.
In the present embodiment, with existing frequency conversion control technique, sensing technology, according to production technology to fluid parameter (for example
Flow, pressure) the need for set fluid parameter output valve, using the sensor installed in output end, output signal value is fed back
Computing, PID regulations is compared to speed regulating control unit and setting value to control, speed regulating control unit output speed regulating control signal
(frequency), the rotating speed of control adjustment fluid device, makes fluid output parameter value change with the change of rotating speed, so as to reach company
The closed loop regulation of parameter value needed for continuous, stable output technique.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 regulation door aperture.By table 1
It can be seen that valve opening and output flow, the proportionate relationship of power output of fluid device, such as it is defeated when valve opening is 50%
Outflow is 80%, and power output is 94%/98%.
| Flow (%) | Adjust door aperture (100%) | Entrance door control shaft power (%) | Outlet portal control 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 |
The fluid device shaft power of table 1 and regulation door aperture proportionate relationship
Fluid flow is adjusted using valve opening, the method for pressure has the phenomenon for wasting electric energy.Pass through valve opening
To adjust during fluid flow, the power output down ratio of fluid device is simultaneously few, as shown in table 1, when flow is reduced to 50%,
The power output of fluid device only drops to 81%.According to theoretical calculation, when blower fan, water pump rotating speed from N1It is changed into N2When, flow
Q, lift H, the theoretic variation relations of shaft power P are：
Q2=Q1(N2/N1)
H2=H1(N2/N1)2
P2=P1(N2/N1)3
Wherein, Q1Expression rotating speed is N1When air quantity (flow), Q2Expression rotating speed is N2When air quantity (flow), H1Represent to turn
Speed is N1When blast (lift), H2Expression rotating speed is N2When blast (lift), P1Expression rotating speed is N1When fan shaft power,
P2Expression rotating speed is N2When fan shaft power.
Understand that blower fan or pump capacity are directly proportional to the first power of rotating speed by above formula, the quadratic power of pressure and rotating speed is into just
Than, and shaft power is directly proportional to the cube of rotating speed.Thus, ideally, flow, pressure/lift, rotating speed and shaft power
Relation is as shown in table 2.As can be seen from Table 1, the rotating speed of variable torque is directly proportional to output fluid flow, with exporting fluid pressure
Square being directly proportional of power, cube it is directly proportional to power output, for example, when the rotating speed of variable torque declines 50%, it is exported
Flow is also 50%, and output pressure is 25%, and power output is 12.5%.Its energy-saving effect ratio is obtained with valve regulated effect master
It is many.
| Flow (%) | Pressure (lift) (%) | Rotating 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 |
Relation between the ideal situation down-off of table 2, pressure/lift, rotating speed and shaft power
Actual production process operation operating mode is directed to using the present invention it can be seen from above-mentioned contrast, changes fluid device
Rotating speed that the purpose of regulation technological parameter can be reached, can improve equipment runnability, improves equipment operating efficiency, saves electricity
Energy.
Become torque (fluid class) equipment, using valve regulated flow, pressure with adjusting flow, pressure using equipment speed governing
Shaft power comparison：
1) using respective motor shaft power P when plate washer, valve regulated flow, pressureGearRelation with flow Q is：
PGear≈(0.4+0.6Q)*Pe (1)
Wherein, 0.4 and 0.6 be empirical theory calculate coefficient.
2) using respective motor shaft power P when speed governing regulation flow, pressureBecomeRelation with flow Q is：
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 transform frequency control regulation as, interpretation of result is as follows by original air door regulation air quantity：
Electrical consumption power is (by (1) formula) when adjusting air quantity with the air door of 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 the frequency control of the present 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 during using the variable frequency adjustment of the present invention than adjusting air quantity using the air door of prior art：
(186.2-52.9=133.3 KW)
Year amount of electricity saving, it is 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 is：
PGear-PBecome/PGear* 100%
=186.2-52.9/186.2*100%
=71.6%
Analysis, which is calculated, more than can be seen that blower fan water pump class variable torque, after the frequency control using the present invention,
Power savings are it will be apparent that in addition, after the rotating speed reduction of machinery, mechanical abrasion is reduced, and service life is extended, indirectly warp
Benefit of helping is also very considerable.
The fluid parameter adjusting method of the embodiment of the present invention, by the soft start to fluid device, can reduce starting electricity
Stream, reduces the impact to power network, reduces line loss.By fed-back fluid parameter electric signal to speed regulating control unit, and pass through
The supply frequency of PID regulation control fluid devices, can realize automatic, the closed loop regulation of fluid conveying, improve system operation
Stability, reaches the purpose matched with actual condition, while process requirements are met, it is possible to increase device efficiency, reduces
The power output of motor, saves electric energy.
In the description of this specification, reference term " one embodiment ", " specific embodiment ", " some implementations
Example ", " such as ", " example ", " specific example " or the description " some examples " mean to combine the embodiment or example description
Specific features, structure, material or feature are contained at least one embodiment of the present invention or example.In this manual,
Identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.Moreover, the specific features of description, knot
Structure, material or feature can in an appropriate manner be combined in any one or more embodiments or example.Each embodiment
In the step of be related to order be used for the implementation for schematically illustrating the present invention, sequence of steps therein is not construed as limiting, can be as needed
Appropriately adjust.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can be used in one or more computers for wherein including computer usable program code
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Particular embodiments described above, has been carried out further in detail to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail it is bright, should be understood that the foregoing is only the present invention specific embodiment, the guarantor being not intended to limit the present invention
Scope is protected, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. should be included in this
Within the protection domain of invention.
Claims (10)
1. a kind of fluid parameter regulating system, it is characterised in that including：
Fluid device, 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, the fluid parameter value for detecting fluid parameter adjustment system output end, and the fluid parameter value is converted
For corresponding electric signal；
The speed regulating control unit, is additionally operable to according to the electric signal and fluid parameter setting value, passes through PID regulation control outputs
Supply frequency, and the fluid device operation is controlled using the supply frequency, it is defeated to update the fluid parameter regulating system
Go out the fluid parameter value at end；
Power supply, for being powered for the fluid parameter regulating system.
2. fluid parameter regulating system as claimed in claim 1, it is characterised in that the speed regulating control unit, is additionally operable to control
Make the rate of change and the electric signal of the supply frequency and the difference of the fluid parameter setting value is directly proportional.
3. fluid parameter regulating system as claimed in claim 1, it is characterised in that
The transmitter, is additionally operable to the fluid parameter value after renewal being converted into the electric signal of renewal；
The speed regulating control unit, is additionally operable to be adjusted by PID according to the electric signal and the fluid parameter setting value of the renewal
The supply frequency that section control output updates, and the control fluid device operation is updated using the supply frequency of the renewal, with
Closed-loop control is carried out to the fluid parameter value of the fluid parameter regulating system output end, makes the fluid parameter regulating system defeated
Go out the fluid parameter value stabilization at end in the fluid parameter setting value.
4. fluid parameter regulating system as claimed in claim 1, it is characterised in that also include：
Pipeline valve, the parameter of the fluid for adjusting the fluid device conveying, with the fluid parameter value detected.
5. fluid parameter regulating system as claimed in claim 1, it is characterised in that the speed regulating control unit, it is additionally operable to pair
Motor in the fluid device is overloaded, short circuit, overvoltage, under-voltage, ground connection and open-phase protection.
6. fluid parameter regulating system as claimed in claim 1, it is characterised in that the speed regulating control unit, is additionally operable to set
Put the fluid parameter setting value.
7. a kind of fluid parameter adjusting method, it is characterised in that including：
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 the parameter value of the fluid is converted into corresponding electricity
Signal；
According to the electric signal and fluid parameter setting value, by PID regulation control out-put supply frequencies, and the power supply is utilized
Fluid device described in FREQUENCY CONTROL is run, to update the parameter value of the fluid conveyed via the fluid device.
8. fluid parameter adjusting method as claimed in claim 7, it is characterised in that
The difference of the rate of change of the supply frequency and the electric signal and the fluid parameter setting value is directly proportional.
9. fluid parameter adjusting method as claimed in claim 7, it is characterised in that also include：
The parameter value of fluid after renewal is converted into the electric signal of renewal；
The power supply frequency that control output updates is adjusted by PID according to the electric signal of the renewal and the fluid parameter setting value
Rate, and the control fluid device operation is updated using the supply frequency of the renewal, with to being conveyed via the fluid device
Fluid parameter value carry out closed-loop control, make via the fluid device convey fluid parameter value stabilization in the fluid
Pre-set parameter.
10. fluid parameter adjusting method as claimed in claim 7, it is characterised in that detection is conveyed via the fluid device
Fluid parameter value, including：
Detection conveys and utilized the parameter value of the fluid of pipeline valve adjustment via the fluid device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710164422.6A CN107084139B (en) | 2017-03-20 | 2017-03-20 | Fluid parameter regulating system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710164422.6A CN107084139B (en) | 2017-03-20 | 2017-03-20 | Fluid parameter regulating system and method |
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| CN107084139B (en) | 2019-05-07 |
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