CN104949283A - Air valve adjusting method and system for controlling air volume - Google Patents

Air valve adjusting method and system for controlling air volume Download PDF

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Publication number
CN104949283A
CN104949283A CN201510373616.8A CN201510373616A CN104949283A CN 104949283 A CN104949283 A CN 104949283A CN 201510373616 A CN201510373616 A CN 201510373616A CN 104949283 A CN104949283 A CN 104949283A
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Prior art keywords
air
valve
air quantity
characteristic
current
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CN201510373616.8A
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CN104949283B (en
Inventor
孔鹏
蔡燕君
汪建锋
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Shanghai Zephirus Technology Co Ltd
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Shanghai Zephirus Technology Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Flow Control (AREA)

Abstract

The invention provides an air valve adjusting method and system for controlling air volume. The air value adjusting method comprises the steps that air volumes of different openings are measured under different external resistances of the air valve; different air volumes under the different external resistances of the air valve and curve families of air value openings are obtained, and a family curve formula is confirmed; the best resistance characteristic curve in the curve families is confirmed, and a characteristic constant is confirmed; a current air volume of the air valve and a current opening of the air valve are measured, and a characteristic variation coefficient in the family curve formula is confirmed, so that a characteristic curve of the air volume of the air valve and the air valve opening under the current external resistance of the air valve are confirmed; a needed air valve opening corresponding to a target air volume of the air valve is obtained according to the characteristic curve of the air volume of the air valve and the air valve opening under the current external resistance of the air valve; the current opening of the air valve is adjusted to the obtained needed valve opening. According to the air valve adjusting method and system for controlling the air volume, the characteristic curve of the external resistance of the air valve is used for predicting and controlling the opening of the air valve, the adjustment is simple, the control is quick, and a pretty high control speed can be reached.

Description

A kind of air-valve control method and system controlling air quantity
Technical field
The present invention relates to industrial ventilation technical field, be specially a kind of the air-valve control method and the system that control air quantity.
Background technology
Industrial ventilation or supply air system, often in order to reach control object, use all kinds of air-valve to carry out the control of air quantity.The control system of this kind of air-valve often includes and detects air quantity, valve area, system pressure, controller (mechanism), valve area actuator (mechanism).And pressure in the middle of wind system pipeline and resistance situation can frequent variations, air-valve needs to carry out in good time adjustment to reach technique or the comfortableness requirement of system.
Current air-valve control mode mainly contains two classes.The first kind is the closed-loop control of wind speed/air quantity, and this type of control method mainly carries out FEEDBACK CONTROL according to the wind speed/wind pressure sensor in pipe-line system.Usual employing PID control method, as shown in Figure 1, when Air Quantity Required changes, PID controls set point change, then system deviation increases, and the control of PID exports and increases, and system is exported by multiply periodic continuous adjustment and finally reaches control set point.When the pressure of pipe-line system or resistance change, wind speed in pipe-line system can change, and now the object procedure value of PID changes, then system deviation increases, the control of PID exports and increases, and system is exported by multiply periodic continuous adjustment and finally reaches control set point.The parameter tuning that PID controls often is wasted time and energy in working control engineering very much, and the set of parameter simultaneously often adjusted adapts to completely for the system disturbance control difference of different time characteristic.The occasion not high at general real-time control overflow can be suitable for, but needs the fast accurate occasion that controls often cannot to meet the demands as easy as rolling off a log generation hyperharmonic concussion at some.Equations of The Second Kind control mode reaches equalizing pressure mainly through the self-adaptative adjustment mechanism of air-valve inside, as shown in Figure 2, the air-valve of this kind of adaptive mechanism often utilizes spring, air bag, gravity isoequilibrium mechanism, when pipeline pressure increases, then the aperture of air-valve diminishes because of the compensating action of balanced controls, when pipeline pressure diminishes, then the aperture of air-valve increases, and is carried out the change of (resistance of air-valve) equalizing pressure by the change of such aperture.Although this kind of air-valve has good pressure adaptive performance, general structure is complicated, and cost is high, and the pressure loss is large.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of the air-valve control method and the system that control air quantity, for solving the problem that control rate is slow, deviation is large and wind valve structure is complicated, cost is high existed when prior art stroke valve controls.
For achieving the above object and other relevant objects, the invention provides a kind of air-valve control method controlling air quantity, the air-valve control method of described control air quantity comprises: under different air-valve external drag situations, measures the air quantity of air-valve under different opening; According to the air quantity under air-valve different opening, obtain the set of curves of air-valve air quantity and valve area under different air-valve external drags, and determine set of curves formula; Determine the best resistance curve in described set of curves, and determine the characteristic constant in described set of curves formula according to described best resistance curve; When there is skew in control objectives or air-valve external drag situation changes, measure current air-valve air quantity and current valve area, characteristic characteristic variations coefficient under current air-valve external drag is determined in described set of curves formula by described current air-valve air quantity and described current valve area, thus the characteristic curve of air-valve air quantity and valve area under determining current air-valve external drag; According to the characteristic curve of air-valve air quantity and valve area under current air-valve external drag, obtain the required valve area corresponding with target air-valve air quantity; The current aperture of adjusting air valve is the described required valve area obtained.
Preferably, described air-valve external drag is that the drag overall of the supply air system at air-valve place deducts air-valve self resistance.
Preferably, described set of curves formula is:
y=Ax 2+Bx+C
Wherein, y is valve area, and x is air-valve air quantity, A and C is set of curves characteristic constant, and B is characteristic characteristic variations coefficient under different air-valve external drag.
Preferably, the characteristic curve as B=0 is best resistance curve; Described best resistance curve is y=Ax 2+ C.
Preferably, by any two groups of corresponding air-valve air quantity on described best resistance curve and valve area, the characteristic constant in described set of curves formula is determined.
For achieving the above object, the present invention also provides a kind of air-valve regulating system controlling air quantity, and the air-valve regulating system of described control air quantity comprises: measure module, under different air-valve external drag situations, measures the air quantity of air-valve under different opening; Set of curves module, is connected with described mensuration module, for according to the air quantity under air-valve different opening, obtains the set of curves of air-valve air quantity and valve area under different air-valve external drags, and determines set of curves formula; Control anticipation module, being connected with described set of curves module, for determining the best resistance curve in described set of curves, and determining the characteristic constant in described set of curves formula according to described best resistance curve; Current properties curve module, be connected with described control anticipation module with described set of curves module, when there is skew in control objectives or air-valve external drag situation changes, for to determine in described set of curves formula characteristic characteristic variations coefficient under current air-valve external drag according to the current air-valve air quantity of current mensuration and current valve area, thus the characteristic curve of air-valve air quantity and valve area under determining current air-valve external drag; Valve area determination module, is connected with described current properties curve module, for the characteristic curve according to air-valve air quantity and valve area under current air-valve external drag, obtains the required valve area corresponding with target air-valve air quantity; Adjustment module, is connected with described valve area determination module, for the current aperture of air-valve being adjusted to the described required valve area of acquisition.
Preferably, described air-valve external drag is that the drag overall of the supply air system at air-valve place deducts air-valve self resistance.
Preferably, described set of curves formula is:
y=Ax 2+Bx+C
Wherein, y is valve area, and x is air-valve air quantity, A and C is set of curves characteristic constant, and B is characteristic characteristic variations coefficient under different air-valve external drag.
Preferably, the characteristic curve as B=0 is best resistance curve; Described best resistance curve is y=Ax 2+ C.
Preferably, by any two groups of corresponding air-valve air quantity on described best resistance curve and valve area, the characteristic constant in described set of curves formula is determined.
As mentioned above, a kind of air-valve control method and system controlling air quantity of the present invention, has following beneficial effect:
1, the present invention adopts air-valve external drag characteristic family to carry out the aperture of PREDICTIVE CONTROL air-valve, and debugging is simple, controls rapidly, in the departure allowed band allowed, can reach very high control rate.
2, the present invention compares traditional PID closed loop feedback control, has speed faster, shakes little advantage.
3, the present invention compares the air-valve of internal pressure balanced controls, then have implementation cost low, the advantage that maintenance cost is low and implementation is good.
4, the present invention has stronger versatility and practicality.
Accompanying drawing explanation
Fig. 1 is shown as PID closed loop feedback traditional in prior art and controls schematic diagram.
Fig. 2 is shown as in prior art the adjusting air valve schematic diagram with pressure balance mechanism.
Fig. 3 is shown as a kind of schematic flow sheet controlling the air-valve control method of air quantity of the present invention.
Fig. 4 is shown as a kind of characteristic family figure of air-valve control method stroke valve under different external drag situation controlling air quantity of the present invention.
Fig. 5 is shown as a kind of schematic diagram controlling to obtain in the air-valve control method of air quantity required valve area of the present invention.
Fig. 6 is shown as a kind of structural representation controlling the air-valve regulating system of air quantity of the present invention.
Element numbers explanation
The air-valve regulating system of 1 control air quantity
11 measure module
12 set of curves modules
13 control anticipation module
14 current properties curve modules
15 valve area determination modules
16 adjustment modules
S11 ~ S16 step
Detailed description of the invention
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this description can understand other advantages of the present invention and effect easily.
Refer to Fig. 3 to Fig. 6.Notice, structure, ratio, size etc. that this description institute accompanying drawings illustrates, content all only in order to coordinate description to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, still all should drop on disclosed technology contents and obtain in the scope that can contain.Simultaneously, quote in this description as " on ", D score, "left", "right", " centre " and " one " etc. term, also only for ease of understanding of describing, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under changing technology contents without essence, when being also considered as the enforceable category of the present invention.
The object of the present invention is to provide a kind of the air-valve control method and the system that control air quantity, for solving the problem that control rate is slow, deviation is large and wind valve structure is complicated, cost is high existed when prior art stroke valve controls.Of the present inventionly a kind ofly controlling the air-valve control method of air quantity and the principle of system and embodiment by elaborating below, making those skilled in the art not need creative work can understand a kind of air-valve control method and system controlling air quantity of the present invention.
The present embodiment provides a kind of air-valve control method controlling air quantity, and particularly, as shown in Figure 3, the air-valve control method of described control air quantity comprises the following steps.
Step S11, under different air-valve external drag situations, measures the air quantity of air-valve under different opening; Wherein, described air-valve external drag is that the drag overall of the supply air system at air-valve place deducts air-valve self resistance.Under same air-valve external drag situation, measure the air quantity of air-valve under different opening, obtain the data of many group apertures and corresponding air quantity.
Step S12, according to the air quantity under air-valve different opening, obtains the set of curves of air-valve air quantity and valve area under different air-valve external drags, and determines set of curves formula.By the aperture adopting air-valve external drag characteristic family to carry out PREDICTIVE CONTROL air-valve, debugging is simple, controls rapidly, in the departure allowed band allowed, can reach very high control rate.
Particularly, as shown in Figure 4, in the present embodiment, described set of curves formula is:
y=Ax 2+Bx+C
Wherein, y is valve area, and x is air-valve air quantity, A and C is set of curves characteristic constant, and B is characteristic characteristic variations coefficient under different air-valve external drag.
Step S13, determines the best resistance curve in described set of curves, and determines the characteristic constant in described set of curves formula according to described best resistance curve.
Particularly, as shown in Figure 4, in the present embodiment, the characteristic curve as B=0 is best resistance curve; Described best resistance curve is y=Ax 2+ C.By any two groups of corresponding air-valve air quantity on described best resistance curve and valve area, determine the characteristic constant in described set of curves formula, i.e. A and C.As shown in Figure 5, now, described best resistance curve can be called limber up period external drag characteristic curve, by 2 points on limber up period external drag characteristic curve, such as, characteristic constant A and C in described set of curves formula is determined by (air quantity is X1, and aperture is Y1) and (air quantity is X1, and aperture is Y1) 2.
Step S14, when there is skew in control objectives or air-valve external drag situation changes, measure current air-valve air quantity and current valve area (the air quantity Xm in such as Fig. 5, aperture Ym), characteristic characteristic variations coefficient under current air-valve external drag is determined in described set of curves formula by described current air-valve air quantity and described current valve area, thus the characteristic curve of air-valve air quantity and valve area under determining current air-valve external drag, the current actual external drag characteristic curve namely described in Fig. 5.
Step S15, according to the characteristic curve of air-valve air quantity and valve area under current air-valve external drag, obtain the required valve area (namely required valve area be Yr Fig. 5 shown in) corresponding with target air-valve air quantity (Xr namely shown in Fig. 5).
Step S16, the current aperture of adjusting air valve is the described required valve area obtained.This sample embodiment is measured by the air-valve external drag situation of timing, can continuous adjustment System resistance working curve.Reach good anticipation control effects.
For achieving the above object, the present embodiment also provides a kind of air-valve regulating system controlling air quantity, particularly, as shown in Figure 6, the air-valve regulating system 1 controlling air quantity comprises: measure module 11, set of curves module 12, control anticipation module 13, current properties curve module 14, valve area determination module 15 and adjustment module 16.
Measure module 11 under different air-valve external drag situations, measure the air quantity of air-valve under different opening.Wherein, described air-valve external drag is that the drag overall of the supply air system at air-valve place deducts air-valve self resistance.Under same air-valve external drag situation, measure module 11 and measure the air quantity of air-valve under different opening, obtain the data of many group apertures and corresponding air quantity.
Set of curves module 12 is connected with described mensuration module 11, for according to the air quantity under air-valve different opening, obtains the set of curves of air-valve air quantity and valve area under different air-valve external drags, and determines set of curves formula.By the aperture adopting air-valve external drag characteristic family to carry out PREDICTIVE CONTROL air-valve, debugging is simple, controls rapidly, in the departure allowed band allowed, can reach very high control rate.
Particularly, as shown in Figure 4, in the present embodiment, described set of curves formula is:
y=Ax 2+Bx+C
Wherein, y is valve area, and x is air-valve air quantity, A and C is set of curves characteristic constant, and B is characteristic characteristic variations coefficient under different air-valve external drag.
Controlling anticipation module 13 to be connected with described set of curves module 12, for determining the best resistance curve in described set of curves, and determining the characteristic constant in described set of curves formula according to described best resistance curve.
Particularly, as shown in Figure 4, in the present embodiment, the characteristic curve as B=0 is best resistance curve; Described best resistance curve is y=Ax 2+ C.By any two groups of corresponding air-valve air quantity on described best resistance curve and valve area, determine the characteristic constant in described set of curves formula, i.e. A and C.As shown in Figure 5, now, described best resistance curve can be called limber up period external drag characteristic curve, by 2 points on limber up period external drag characteristic curve, such as, characteristic constant A and C in described set of curves formula is determined by (air quantity is X1, and aperture is Y1) and (air quantity is X1, and aperture is Y1) 2.
Current properties curve module 14 is connected with described control anticipation module 13 with described set of curves module 12, as shown in Figure 5, when there is skew in control objectives or air-valve external drag situation changes, measure current air-valve air quantity and current valve area (the air quantity Xm in such as Fig. 5, aperture Ym), characteristic characteristic variations coefficient under current air-valve external drag is determined in described set of curves formula by described current air-valve air quantity and described current valve area, thus the characteristic curve of air-valve air quantity and valve area under determining current air-valve external drag, namely the current actual external drag characteristic curve described in Fig. 5.
Valve area determination module 15 is connected with described current properties curve module 14, for the characteristic curve according to air-valve air quantity and valve area under current air-valve external drag, obtains the required valve area corresponding with target air-valve air quantity.Particularly, as shown in Figure 5, according to the characteristic curve of air-valve air quantity and valve area under current air-valve external drag, obtain the required valve area (namely required valve area be Yr Fig. 5 shown in) corresponding with target air-valve air quantity (Xr namely shown in Fig. 5).
Described in adjustment module 16, valve area determination module 15 is connected, for the current aperture of air-valve being adjusted to the described required valve area of acquisition.This sample embodiment is measured by the air-valve external drag situation of timing, can continuous adjustment System resistance working curve.Reach good anticipation control effects.
In sum, the present invention adopts air-valve external drag characteristic family to carry out the aperture of PREDICTIVE CONTROL air-valve, and debugging is simple, controls rapidly, in the departure allowed band allowed, can reach very high control rate; The present invention compares traditional PID closed loop feedback and controls, and has speed faster, shakes little advantage; The present invention compares the air-valve of internal pressure balanced controls, then have implementation cost low, the advantage that maintenance cost is low and implementation is good; And the present invention has stronger versatility and practicality.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.

Claims (10)

1. control an air-valve control method for air quantity, it is characterized in that, the air-valve control method of described control air quantity comprises:
Under different air-valve external drag situations, measure the air quantity of air-valve under different opening;
According to the air quantity under air-valve different opening, obtain the set of curves of air-valve air quantity and valve area under different air-valve external drags, and determine set of curves formula;
Determine the best resistance curve in described set of curves, and determine the characteristic constant in described set of curves formula according to described best resistance curve;
When there is skew in control objectives or air-valve external drag situation changes, measure current air-valve air quantity and current valve area, characteristic characteristic variations coefficient under current air-valve external drag is determined in described set of curves formula by described current air-valve air quantity and described current valve area, thus the characteristic curve of air-valve air quantity and valve area under determining current air-valve external drag;
According to the characteristic curve of air-valve air quantity and valve area under current air-valve external drag, obtain the required valve area corresponding with target air-valve air quantity;
The current aperture of adjusting air valve is the described required valve area obtained.
2. the air-valve control method of control air quantity according to claim 1, is characterized in that, described air-valve external drag is that the drag overall of the supply air system at air-valve place deducts air-valve self resistance.
3. the air-valve control method of control air quantity according to claim 1, is characterized in that, described set of curves formula is:
y=Ax 2+Bx+C
Wherein, y is valve area, and x is air-valve air quantity, A and C is set of curves characteristic constant, and B is characteristic characteristic variations coefficient under different air-valve external drag.
4. the air-valve control method of control air quantity according to claim 3, is characterized in that, the characteristic curve as B=0 is best resistance curve; Described best resistance curve is y=Ax 2+ C.
5. the air-valve control method of control air quantity according to claim 3, is characterized in that, by any two groups of corresponding air-valve air quantity on described best resistance curve and valve area, determines the characteristic constant in described set of curves formula.
6. control an air-valve regulating system for air quantity, it is characterized in that, the air-valve regulating system of described control air quantity comprises:
Measure module, under different air-valve external drag situations, measure the air quantity of air-valve under different opening;
Set of curves module, is connected with described mensuration module, for according to the air quantity under air-valve different opening, obtains the set of curves of air-valve air quantity and valve area under different air-valve external drags, and determines set of curves formula;
Control anticipation module, being connected with described set of curves module, for determining the best resistance curve in described set of curves, and determining the characteristic constant in described set of curves formula according to described best resistance curve;
Current properties curve module, be connected with described control anticipation module with described set of curves module, when there is skew in control objectives or air-valve external drag situation changes, for to determine in described set of curves formula characteristic characteristic variations coefficient under current air-valve external drag according to the current air-valve air quantity of current mensuration and current valve area, thus the characteristic curve of air-valve air quantity and valve area under determining current air-valve external drag;
Valve area determination module, is connected with described current properties curve module, for the characteristic curve according to air-valve air quantity and valve area under current air-valve external drag, obtains the required valve area corresponding with target air-valve air quantity;
Adjustment module, is connected with described valve area determination module, for the current aperture of air-valve being adjusted to the described required valve area of acquisition.
7. the air-valve regulating system of control air quantity according to claim 6, is characterized in that, described air-valve external drag is that the drag overall of the supply air system at air-valve place deducts air-valve self resistance.
8. the air-valve regulating system of control air quantity according to claim 6, is characterized in that, described set of curves formula is:
y=Ax 2+Bx+C
Wherein, y is valve area, and x is air-valve air quantity, A and C is set of curves characteristic constant, and B is characteristic characteristic variations coefficient under different air-valve external drag.
9. the air-valve regulating system of control air quantity according to claim 8, is characterized in that, the characteristic curve as B=0 is best resistance curve; Described best resistance curve is y=Ax 2+ C.
10. the air-valve regulating system of control air quantity according to claim 8, is characterized in that, by any two groups of corresponding air-valve air quantity on described best resistance curve and valve area, determines the characteristic constant in described set of curves formula.
CN201510373616.8A 2015-06-30 2015-06-30 The air-valve adjusting method and system of a kind of control air quantity Active CN104949283B (en)

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CN106642607A (en) * 2015-11-02 2017-05-10 成都捷本科技有限公司 Linear control method for split multi-blade regulating air valve
CN109708273A (en) * 2018-12-29 2019-05-03 广东美的暖通设备有限公司 The control method and its device of cryogenic refrigeration air-valve
CN109944974A (en) * 2019-03-01 2019-06-28 中国恩菲工程技术有限公司 Switch valve equipment and control method, device, equipment and computer-readable medium
CN114017910A (en) * 2021-10-27 2022-02-08 中国核动力研究设计院 Ventilation system air volume debugging method, ventilation system air volume debugging system and storage medium
CN114439767A (en) * 2021-12-28 2022-05-06 武汉佳德沃博格风动技术有限公司 Variable frequency adjusting method of fan

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