CN103292421A - Multi-split refrigeration operation outer draught fan rotating speed control method - Google Patents
Multi-split refrigeration operation outer draught fan rotating speed control method Download PDFInfo
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- CN103292421A CN103292421A CN2013102384942A CN201310238494A CN103292421A CN 103292421 A CN103292421 A CN 103292421A CN 2013102384942 A CN2013102384942 A CN 2013102384942A CN 201310238494 A CN201310238494 A CN 201310238494A CN 103292421 A CN103292421 A CN 103292421A
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Abstract
A multi-split refrigeration operation outer draught fan rotating speed control method includes the steps of firstly, determining an initial rotating speed according to an outdoor environment temperature after a draught fan is started, wherein the higher the outdoor environment temperature is, the higher the initial rotating speed of the outer draught fan is; secondly, adjusting the rotating speed of the outer draught fan according to a difference value of an air discharging pressure practical value and a target value t minutes after refrigeration operation is conducted, wherein the air discharging pressure target value is determined according to the outdoor environment temperature, and the higher the outdoor environment temperature is, the higher the target pressure is. According to the multi-split refrigeration operation outer draught fan rotating speed control method, the target pressure value can be set according to changes of the outdoor environment temperature, and system running is made to be more reasonable and more reliable. Meanwhile the multi-split refrigeration operation outer draught fan rotating speed control method has the advantages of being high in speed of air discharging pressure adjustment and accurate in air discharging pressure adjustment.
Description
Technical field
The present invention relates to the multi-online air-conditioning system technical field, especially a kind of method for controlling number of revolution of outer blower fan, the specifically outer blower fan method for controlling number of revolution of a kind of multi-joint machine-processed cold operation.
Background technology
Multi-online air-conditioning system relies on technical characterstics such as its control is accurate, use is free, be convenient to install, energy-efficient, plays the part of more and more important role in the central air-conditioning field.Because outer machine of multi-joint machine system can connect many indoor sets, and indoor and outdoor temperature all changing all the time, causes the load variations of multi-joint machine very big.Change on a large scale for adapting to air conditioner load, except the adjusting to compressor frequency, electric expansion valve, the adjusting of outer machine exchange capability of heat is also very important.For the refrigeration mode operation, the adjusting to the outdoor heat exchanger ability at present mainly contains following several method:
1, by cross valve commutation, cutoff outdoor heat exchanger, the area of conditioning chamber external heat exchanger
2, outer blower fan arranges multistage wind shelves, regulates the outdoor fan rotating speed
Regulating the off-premises station heat exchange area need increase system pipeline, valve member, system complex and cost height, and there be limited evidence currently of is used; Conditioning chamber exogenous wind rotating speed is simple and easy to do and effect is good, uses at present generally, and it adopts following dual mode usually:
1, by the outer blower fan rotating speed of outer coiler adjustment, though this method is simple and easy to do, because there is hysteresis quality in coil temperature, reacts slow, so this method is difficult to quick, the accurately control of the system that realizes;
2, at off-premises station environment temperature sensor is set, at compressor exhaust pipe back pressure transducer is set, utilize pressure at expulsion, outdoor environment temperature to regulate outer blower fan rotating speed, this kind mode is present common way.Chinese patent literature CN102518595A discloses this regulative mode on June 27th, 2012, and its specific practice is: according to outdoor environment temperature, the aims of systems pressure at expulsion is fixed in certain scope, departs from this scope and just regulate.Though this adjusting strategy is easy, accurate inadequately, and system exhaust pressure can fluctuate within the specific limits, also do not take into full account outdoor environment temperature to the influence of system exhaust pressure.
Summary of the invention
The objective of the invention is at the problems referred to above, invent a kind of can the variation according to outdoor environment temperature, accurately control the pressure at expulsion of multi-joint mechanism when cold, guarantee multi-joint machine-processed cold operation that pressure at expulsion and system running state adapt blower fan method for controlling number of revolution outward.
Technical scheme of the present invention is:
The outer blower fan control method of a kind of multi-joint machine-processed cold operation, it is characterized in that by environment temperature sensor is set with in detecting outdoor environment temperature at multi-joint machine off-premises station, back pressure transducer is set for detection of the unit pressure at expulsion at compressor exhaust pipe, utilizes detected outdoor environment temperature, pressure at expulsion to control the outdoor fan rotating speed according to the following steps:
Environment temperature T when S1) the detection system operational mode is refrigerating state, when T≤T1, outer blower fan is with rotating speed V1 operation t minute, when T1＜T≤T2, outer blower fan was with rotating speed V2 operation t minute, when T2＜T≤T3, outer blower fan is with rotating speed V3 operation t minute, when T3＜T≤T4, outer blower fan was with rotating speed V4 operation t minute, as T〉during T4, outer blower fan is with rotating speed V5 operation t minute, wherein V1＜V2＜V3＜V4＜V5;
S2) every interval s detects back pressure transducer Pd one time second, according to outdoor environment temperature T, and target setting pressure at expulsion Pm, when T≤T1, P1＜Pm＜P2, when T1＜T≤T2, Pm=P3, when T2＜T≤T3, Pm=P4, when T3＜T≤T4, Pm=P5 is as T〉during T4, Pm=P6;
S3) increase or subtract the rotating speed gear of outer blower fan as follows:
Outer blower fan shelves number variation=deviation * E+ △ deviation * D, deviation=Pd-Pm, △ deviation=current deviation-last time deviation, original deflection is that 0, E, D are constant, judges that regulating cycle is s second;
Described back pressure transducer is mounted on the blast pipe between compressor exhaust pipe and the oil eliminator.
Described outdoor fan is many grades of adjustable speed fans.
The invention has the beneficial effects as follows:
The present invention can be fast, the accurate pressure at expulsion of regulating system, and the pressure at expulsion of system is changed along with the variation of outdoor environment temperature, makes system's operation more reasonable.
Description of drawings
Fig. 1 is multi-joint machine structural representation of the present invention.
Among the figure: 1-compressor, 2-oil eliminator, 3-cross valve, 4-off-premises station heat exchanger, 5-off-premises station orifice union, 6-liquid valve, 7-indoor set orifice union, 8-indoor set heat exchanger, 9-air valve, 10-gas-liquid separator, 11-back pressure transducer, 12-outdoor environment temperature sensor, 13-outdoor fan.
The specific embodiment
Below in conjunction with accompanying drawing the present invention and the specific embodiment thereof are described in further detail.
As shown in Figure 1.
Multi-joint machine of the present invention is made up of an off-premises station, many indoor sets, inside and outside machine tube connectors.Off-premises station mainly is made up of compressor 1, oil eliminator 2, cross valve 3, off-premises station heat exchanger 4, off-premises station blower fan 13, off-premises station orifice union 5, liquid valve 6, air valve 9, gas-liquid separator 10; At compressor exhaust pipe pressure sensor 11 is set, the detection system pressure at expulsion is at the other outdoor environment temperature sensor 12 that arranges of off-premises station heat exchanger; Outdoor fan 13 is many grades of adjustable speed fans; Indoor set mainly is made up of orifice union 7, indoor set heat exchanger 8.
Outer blower fan control method is during refrigeration:
After outer blower fan starts, its initial speed is determined according to outdoor environment temperature T, outdoor environment temperature T is more high, its initial speed is more high, behind the system boot, outer blower fan is regulated and control outer blower fan rotating speed with the pressure at expulsion actual value Pd of system's detection and the difference of pressure at expulsion desired value Pm subsequently with initial speed operation 4 minutes.Target exhaust pressure determines that according to outdoor environment temperature outdoor environment temperature is more high, and goal pressure is more high.
Be example with the R410A refrigerant, specify control law of the present invention:
The initial speed of outer blower fan was to determine according to outdoor environment temperature when system started, when T≤10 ℃, outer blower fan is with rotating speed V1 operation 4 minutes, when 10＜T≤20 ℃, outer blower fan was with rotating speed V2 operation 4 minutes, when 20＜T≤27 ℃, outer blower fan is with rotating speed V3 operation 4 minutes, when 27＜T≤35 ℃, outer blower fan was with rotating speed V4 operation 4 minutes, as T〉35 ℃ times, outer blower fan is with rotating speed V5 operation 4 minutes, wherein V1＜V2＜V3＜V4＜V5;
According to outdoor environment temperature T, target setting pressure at expulsion Pm, when T≤10 ℃, 18＜Pm＜22Bar, when 10＜T≤20 ℃, Pm=22Bar, when 20＜T≤27 ℃, Pm=24Bar, when 27＜T≤35 ℃, Pm=26 Bar is as T〉35 ℃ times, Pm=28 Bar;
System's operation was regulated outer blower fan rotating speed according to the pressure at expulsion Pd of back pressure transducer detection and the difference of goal pressure Pm after 4 minutes.
Control law:
Outer blower fan shelves number variation=deviation * E+ △ deviation * D, deviation=Pd-Pm, △ deviation=current deviation-last time deviation, wherein E=1, D=0.5, outer blower fan shelves number changes round off and rounds, and judges that regulating cycle is 10 seconds.
The part that the present invention does not relate to prior art that maybe can adopt same as the prior art is realized.
Claims (3)
1. the outer blower fan control method of a multi-joint machine-processed cold operation, it is characterized in that by environment temperature sensor is set with in detecting outdoor environment temperature at multi-joint machine off-premises station, back pressure transducer is set for detection of the unit pressure at expulsion at compressor exhaust pipe, utilizes detected outdoor environment temperature, pressure at expulsion to control the outdoor fan rotating speed according to the following steps:
Environment temperature T when S1) the detection system operational mode is refrigerating state, when T≤T1, outer blower fan is with rotating speed V1 operation t minute, when T1＜T≤T2, outer blower fan was with rotating speed V2 operation t minute, when T2＜T≤T3, outer blower fan is with rotating speed V3 operation t minute, when T3＜T≤T4, outer blower fan was with rotating speed V4 operation t minute, as T〉during T4, outer blower fan is with rotating speed V5 operation t minute, wherein V1＜V2＜V3＜V4＜V5;
S2) every interval s detects back pressure transducer Pd one time second, according to outdoor environment temperature T, and target setting pressure at expulsion Pm, when T≤T1, P1＜Pm＜P2, when T1＜T≤T2, Pm=P3, when T2＜T≤T3, Pm=P4, when T3＜T≤T4, Pm=P5 is as T〉during T4, Pm=P6;
S3) increase or subtract the rotating speed gear of outer blower fan as follows:
Outer blower fan shelves number variation=deviation * E+ △ deviation * D, deviation=Pd-Pm, △ deviation=current deviation-last time deviation, original deflection is that 0, E, D are constant, judges that regulating cycle is s second.
2. method according to claim 1 is characterized in that: described back pressure transducer is mounted on the blast pipe between compressor exhaust pipe and the oil eliminator.
3. method according to claim 1, it is characterized in that: described outdoor fan is many grades of adjustable speed fans.
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| CN104697106A (en) * | 2013-12-09 | 2015-06-10 | 珠海格力电器股份有限公司 | Pressure control method of air conditioning system |
| CN104728996A (en) * | 2013-12-23 | 2015-06-24 | 珠海格力电器股份有限公司 | Air conditioner high temperature control method, air conditioner high temperature control device and air conditioning unit comprising same |
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| WO2021238215A1 (en) * | 2020-05-29 | 2021-12-02 | 广东美的制冷设备有限公司 | Control method and device for air conditioner outdoor unit, air conditioner outdoor unit, and air conditioner |
| CN111578472A (en) * | 2020-05-29 | 2020-08-25 | 广东美的制冷设备有限公司 | Control method and device of air conditioner outdoor unit, air conditioner outdoor unit and air conditioner |
| CN112178863A (en) * | 2020-08-17 | 2021-01-05 | 珠海格力电器股份有限公司 | Refrigerant quantity control device and method and air conditioner |
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Application publication date: 20130911 |