CN104729025A - Dynamic refrigerant balance control method in refrigerating process of multi-connected air-conditioner unit - Google Patents
Dynamic refrigerant balance control method in refrigerating process of multi-connected air-conditioner unit Download PDFInfo
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- CN104729025A CN104729025A CN201510164965.9A CN201510164965A CN104729025A CN 104729025 A CN104729025 A CN 104729025A CN 201510164965 A CN201510164965 A CN 201510164965A CN 104729025 A CN104729025 A CN 104729025A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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Abstract
The invention discloses a dynamic refrigerant balance control method in the refrigerating process of a multi-connected air-conditioner unit. The method includes the steps that once it is found that the exhaust temperature of started outdoor units is high, while the exhaust pressure and the suction pressure are insufficient, the frequency of the outdoor units started initially is reduced by 30% in the operating process, and outdoor units originally turned off are made to operate at the frequency 30% the initial operation frequency of the initial outdoor units till it is found by detection that the exhaust temperature is lowered to be in the normal state while both the exhaust pressure and the suction pressure are increased to be in the normal state; once it is found that both the exhaust pressure and the suction pressure of the started outdoor units are overly large, it is judged that the outdoor units originally turned off serve as adjusting outdoor units, electronic expansion valves (2) of the adjusting outdoor units are opened, and the excessive part of refrigerant in system circulation enters the outdoor heat exchangers of the adjusting outdoor units from the electronic expansion valves (2) to be stored. By means of the method, the refrigerant of the started outdoor units can be adjusted automatically.
Description
Technical field
The present invention relates to VRF Air Conditioning System, is specifically the dynamic equilibrium control method of refrigerant during a kind of VRF Air Conditioning System refrigeration.
Background technology
Megastore, office building and factory's many employings central air-conditioning and VRF Air Conditioning System regulate the room temperature.The VRF Air Conditioning System of prior art comprises multiple outdoor unit modules, multiple indoor set module and connects two refrigerant circulation house stewards of each indoor set module and each outdoor unit modules, multiple outdoor unit modules is in parallel, and the outdoor unit modules after parallel connection is communicated with the indoor set module after parallel connection by two refrigerant circulation house stewards.
Each outdoor unit modules comprises compressor, oil eliminator, four-way change-over valve, outdoor heat exchanger (being condenser during refrigeration mode) and outer organic electronic expansion valve, compressor outlet is communicated with one end of oil eliminator, the other end of oil eliminator is communicated with the first valve port of four-way change-over valve, four-way change-over valve second valve port is communicated with outdoor heat exchanger one end, the outdoor heat exchanger other end is communicated with outer organic electronic expansion valve one end, one of circulating in house steward is communicated with for the outer organic electronic expansion valve other end and two root refrigerants, and another root refrigerant circulation house steward in two root refrigerant circulation house stewards is communicated with four-way change-over valve the 3rd valve port of each outdoor unit modules, four-way change-over valve the 4th valve port is communicated with suction port of compressor, each indoor set module comprises indoor heat exchanger (being evaporimeter during refrigeration mode), one that one end and two root refrigerants of indoor heat exchanger circulate in house steward is communicated with, and the house steward that circulates is communicated with for the other end and two root refrigerants another root refrigerant circulated in house steward of indoor heat exchanger.During refrigeration mode, the first valve port of four-way change-over valve is communicated with the second valve port, and the 3rd valve port is communicated with the 4th valve port, and namely refrigerant is along compressor, outdoor heat exchanger, indoor heat exchanger, the circulation of this route of compressor.
This unit be also provided with for measures ambient temperature the first temperature sensor, be positioned at compressor outlet be used for surveying delivery temperature the second temperature sensor, be positioned at equally compressor outlet the first pressure sensor being used for measuring pressure at expulsion and be positioned at suction port of compressor be used for measure the second pressure sensor of pressure of inspiration(Pi), above-mentioned four sensors are all electrically connected with the controller of unit.
When VRF Air Conditioning System is run, the number of units of off-premises station start can be decided according to the load of indoor set, during as indoor set standard-sized sheet, off-premises station is standard-sized sheet also, during the start of indoor set part, off-premises station also part start another part is not started shooting, and during iff one or two indoor set start, off-premises station often also only needs to open one.Like this, the refrigerant in the off-premises station of often start is often on the high side, and the few off-premises station refrigerant of number of times of starting shooting is naturally on the low side.But on the high side or be on the low sidely all unfavorable for unit operation.But in practical operation, when especially singly opening a certain off-premises station, be difficult to again the most reasonably supplement the refrigerant of this start off-premises station, all detect for the off-premises station of start if each, refrigerant is many just to be bled off a part and has lacked and just supplement, and just significantly will certainly increase the workload of attendant, increasing cost of labor, and can refrigerant be wasted, actual operation is not strong.So the automatic adjustment how realizing unit refrigerant has just become technical barrier urgently to be resolved hurrily in industry.
Summary of the invention
The technical problem to be solved in the present invention is, the dynamic equilibrium control method of refrigerant when providing a kind of VRF Air Conditioning System that can automatically regulate the refrigerant of the off-premises station of start to freeze.
Technical solution of the present invention is, the dynamic equilibrium control method of refrigerant when providing a kind of VRF Air Conditioning System to freeze, and its concrete steps are as follows:
A, a unlatching off-premises station normally run, and now testing environment temperature Tao, as met 35 DEG C≤Tao < 43 DEG C, then enters step b, as met 25 DEG C≤Tao < 35 DEG C, then enters step c;
B, the delivery temperature Td, the pressure at expulsion Pd that detect the compressor of the off-premises station of start and pressure of inspiration(Pi) Ps, if meet Td >=95 DEG C and Pd≤2.6Mpa and Ps≤0.6Mpa simultaneously, enter steps d, if meet Pd > 3.7Mpa and Ps > 1.2Mpa, enter step e;
C, the delivery temperature Td, the pressure at expulsion Pd that detect the compressor of the off-premises station of start and pressure of inspiration(Pi) Ps, if meet Td >=95 DEG C and Pd≤2.4Mpa and Ps≤0.5Mpa simultaneously, enter step f, if meet Pd > 3.5Mpa and Ps > 1.1Mpa, enter step g;
D, 70 ﹪ off-premises station frequency of initially starting shooting being reduced to initial launch frequency run, and open another off-premises station as adjustment off-premises station, run regulating off-premises station with 30 ﹪ of the initial launch frequency of initial off-premises station; Until delivery temperature Td≤90 of initial off-premises station DEG C and pressure at expulsion Pd meets 3.2Mpa≤Pd≤3.7Mpa and pressure of inspiration(Pi) Ps meets 0.9Mpa≤Ps≤1.2Mpa, then by outer for conditioning chamber machine-operated machine, initial off-premises station normally runs;
E, the off-premises station of another not started shooting are as adjustment off-premises station, 200 steps are adjusted to by regulating the electronic expansion valve opening of off-premises station, until the pressure at expulsion Pd of the off-premises station of initial start meets Pd≤3.5Mpa and the pressure of inspiration(Pi) Ps≤0.95Mpa of this off-premises station, then close the electric expansion valve regulating off-premises station;
F, 70 ﹪ off-premises station frequency of initially starting shooting being reduced to initial launch frequency run, and open another off-premises station as adjustment off-premises station, run regulating off-premises station with 30 ﹪ of the initial launch frequency of initial off-premises station; Until delivery temperature Td≤90 of initial off-premises station DEG C and pressure at expulsion Pd meets 2.6Mpa≤Pd≤3Mpa and pressure of inspiration(Pi) Ps meets 0.7Mpa≤Ps≤0.9Mpa, then by outer for conditioning chamber machine-operated machine, initial off-premises station normally runs;
G, the off-premises station of another not started shooting are as adjustment off-premises station, 200 steps are adjusted to by regulating the electronic expansion valve opening of off-premises station, until the pressure at expulsion Pd of the off-premises station of initial start meets Pd≤3.2Mpa and the pressure of inspiration(Pi) Ps≤0.9Mpa of this off-premises station, then close the electric expansion valve regulating off-premises station.
This controlling party ratio juris is as follows.Once find that the delivery temperature of off-premises station of start is high and pressure at expulsion and pressure of inspiration(Pi) are all not enough, then judge that this off-premises station lacks refrigerant, now, off-premises station frequency reducing 30 ﹪ initially started shooting is run, and the off-premises station of originally not starting shooting is run with 30 ﹪ of the initial launch frequency of initial off-premises station, like this, both ensure that the total fan-out capability of off-premises station met system cloud gray model requirement, again the refrigerant originally left unused in the off-premises station of not starting shooting is provided, to alleviate the problem of cold medium shortage, after running a period of time, drop to normal by detection discovery delivery temperature and pressure at expulsion and pressure of inspiration(Pi) are all brought up to normally, then illustrate that refrigerant supplements enough, close and regulate off-premises station, initial off-premises station is normally run.And once find the pressure at expulsion of off-premises station of start and pressure of inspiration(Pi) all excessive, then judge that the refrigerant of this off-premises station is too much, now, using the off-premises station of originally not starting shooting as regulating off-premises station, open the electric expansion valve regulating off-premises station, the part refrigerant had more in systemic circulation is entered the outdoor heat exchanger of adjustment off-premises station from electric expansion valve store, when the pressure at expulsion of off-premises station and pressure of inspiration(Pi) that find initial launch all drop to normal after, then in illustrative system, refrigerant is no longer on the high side, close the electric expansion valve regulating off-premises station, the off-premises station of initial launch continues normally to run.
Adopt above method, during VRF Air Conditioning System refrigeration of the present invention, the dynamic equilibrium control method of refrigerant compared with prior art, has the following advantages:
Pass through the method, fully achieve the adjustment that the automatic and spontaneous off-premises station to start of dependence system carries out coolant quantity, without the need to manually adding and bleed off refrigerant at every turn, can all the time guarantee section off-premises station start time, the amount of refrigerant is neither too much nor too little to satisfy the demands, the labour intensity of technical staff can not be increased again, more can not cause the waste of refrigerant, the simple and convenient technical barrier effectively solving cold-producing medium bias current for many years in puzzlement industry.
Accompanying drawing explanation
The systematic schematic diagram of the dynamic equilibrium control method of refrigerant when Fig. 1 is VRF Air Conditioning System of the present invention refrigeration.
Shown in figure 1, compressor, 2, electric expansion valve.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, the dynamic equilibrium control method of refrigerant during VRF Air Conditioning System refrigeration of the present invention, its concrete steps are as follows.
A, a unlatching off-premises station normally run, and now testing environment temperature Tao, as met 35 DEG C≤Tao < 43 DEG C, then enters step b, as met 25 DEG C≤Tao < 35 DEG C, then enters step c.
B, the delivery temperature Td, the pressure at expulsion Pd that detect the compressor 1 of the off-premises station of start and pressure of inspiration(Pi) Ps, if meet Td >=95 DEG C and Pd≤2.6Mpa and Ps≤0.6Mpa simultaneously, enter steps d, if meet Pd > 3.7Mpa and Ps > 1.2Mpa, enter step e; If neither meet the condition entering steps d also do not meet the condition entering step e, illustrate that refrigerant is neither too much nor too little, continue normally to run.
C, the delivery temperature Td, the pressure at expulsion Pd that detect the compressor 1 of the off-premises station of start and pressure of inspiration(Pi) Ps, if meet Td >=95 DEG C and Pd≤2.4Mpa and Ps≤0.5Mpa simultaneously, enter step f, if meet Pd > 3.5Mpa and Ps > 1.1Mpa, enter step g; If neither meet the condition entering step f also do not meet the condition entering step g, illustrate that refrigerant is neither too much nor too little, continue normally to run.
D, 70 ﹪ off-premises station frequency of initially starting shooting being reduced to initial launch frequency run, and open another off-premises station as adjustment off-premises station, run regulating off-premises station with 30 ﹪ of the initial launch frequency of initial off-premises station; Until delivery temperature Td≤90 of initial off-premises station DEG C and pressure at expulsion Pd meets 3.2Mpa≤Pd≤3.7Mpa and pressure of inspiration(Pi) Ps meets 0.9Mpa≤Ps≤1.2Mpa, then by outer for conditioning chamber machine-operated machine, initial off-premises station normally runs.
E, the off-premises station of another not started shooting are as adjustment off-premises station, 200 steps are adjusted to by regulating electric expansion valve 2 aperture of off-premises station, until the pressure at expulsion Pd of the off-premises station of initial start meets Pd≤3.5Mpa and the pressure of inspiration(Pi) Ps≤0.95Mpa of this off-premises station, then close the electric expansion valve 2 regulating off-premises station; And the off-premises station of initially starting shooting normally runs.
F, 70 ﹪ off-premises station frequency of initially starting shooting being reduced to initial launch frequency run, and open another off-premises station as adjustment off-premises station, run regulating off-premises station with 30 ﹪ of the initial launch frequency of initial off-premises station; Until delivery temperature Td≤90 of initial off-premises station DEG C and pressure at expulsion Pd meets 2.6Mpa≤Pd≤3Mpa and pressure of inspiration(Pi) Ps meets 0.7Mpa≤Ps≤0.9Mpa, then by outer for conditioning chamber machine-operated machine, initial off-premises station normally runs.
G, the off-premises station of another not started shooting are as adjustment off-premises station, 200 steps are adjusted to by regulating electric expansion valve 2 aperture of off-premises station, until the pressure at expulsion Pd of the off-premises station of initial start meets Pd≤3.2Mpa and the pressure of inspiration(Pi) Ps≤0.9Mpa of this off-premises station, then close the electric expansion valve 2 regulating off-premises station, and the off-premises station of initially starting shooting normally runs.
Claims (1)
1. a dynamic equilibrium control method for refrigerant when VRF Air Conditioning System is freezed, is characterized in that: its concrete steps are as follows:
A, a unlatching off-premises station normally run, and now testing environment temperature Tao, as met 35 DEG C≤Tao < 43 DEG C, then enters step b, as met 25 DEG C≤Tao < 35 DEG C, then enters step c;
B, the delivery temperature Td, the pressure at expulsion Pd that detect the compressor (1) of the off-premises station of start and pressure of inspiration(Pi) Ps, if meet Td >=95 DEG C and Pd≤2.6Mpa and Ps≤0.6Mpa simultaneously, enter steps d, if meet Pd > 3.7Mpa and Ps > 1.2Mpa, enter step e;
C, the delivery temperature Td, the pressure at expulsion Pd that detect the compressor (1) of the off-premises station of start and pressure of inspiration(Pi) Ps, if meet Td >=95 DEG C and Pd≤2.4Mpa and Ps≤0.5Mpa simultaneously, enter step f, if meet Pd > 3.5Mpa and Ps > 1.1Mpa, enter step g;
D, 70 ﹪ off-premises station frequency of initially starting shooting being reduced to initial launch frequency run, and open another off-premises station as adjustment off-premises station, run regulating off-premises station with 30 ﹪ of the initial launch frequency of initial off-premises station; Until delivery temperature Td≤90 of initial off-premises station DEG C and pressure at expulsion Pd meets 3.2Mpa≤Pd≤3.7Mpa and pressure of inspiration(Pi) Ps meets 0.9Mpa≤Ps≤1.2Mpa, then by outer for conditioning chamber machine-operated machine, initial off-premises station normally runs;
E, the off-premises station of another not started shooting are as adjustment off-premises station, 200 steps are adjusted to by regulating electric expansion valve (2) aperture of off-premises station, until the pressure at expulsion Pd of the off-premises station of initial start meets Pd≤3.5Mpa and the pressure of inspiration(Pi) Ps≤0.95Mpa of this off-premises station, then close the electric expansion valve (2) regulating off-premises station;
F, 70 ﹪ off-premises station frequency of initially starting shooting being reduced to initial launch frequency run, and open another off-premises station as adjustment off-premises station, run regulating off-premises station with 30 ﹪ of the initial launch frequency of initial off-premises station; Until delivery temperature Td≤90 of initial off-premises station DEG C and pressure at expulsion Pd meets 2.6Mpa≤Pd≤3Mpa and pressure of inspiration(Pi) Ps meets 0.7Mpa≤Ps≤0.9Mpa, then by outer for conditioning chamber machine-operated machine, initial off-premises station normally runs;
G, the off-premises station of another not started shooting are as adjustment off-premises station, 200 steps are adjusted to by regulating electric expansion valve (2) aperture of off-premises station, until the pressure at expulsion Pd of the off-premises station of initial start meets Pd≤3.2Mpa and the pressure of inspiration(Pi) Ps≤0.9Mpa of this off-premises station, then close the electric expansion valve (2) regulating off-premises station.
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| CN106931604A (en) * | 2017-03-30 | 2017-07-07 | 四川长虹电器股份有限公司 | The anti-refrigerant of VRF air conditioning piles up processing method |
| CN107676933A (en) * | 2017-09-18 | 2018-02-09 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN108195005A (en) * | 2017-12-28 | 2018-06-22 | 青岛海信日立空调系统有限公司 | A kind of three control water source multi-connected machines and its control method |
| CN111520875A (en) * | 2020-03-24 | 2020-08-11 | 青岛海尔空调电子有限公司 | Control method and system for multi-split air conditioner |
| CN111928419A (en) * | 2020-07-14 | 2020-11-13 | 青岛海尔空调电子有限公司 | Control method and system for multi-split air conditioning unit |
| CN112762509A (en) * | 2020-12-31 | 2021-05-07 | 浙江中广电器股份有限公司 | Storage control method for refrigerant during heating of waterless floor heating multi-split air conditioner |
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| CN106931604A (en) * | 2017-03-30 | 2017-07-07 | 四川长虹电器股份有限公司 | The anti-refrigerant of VRF air conditioning piles up processing method |
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| CN111928419B (en) * | 2020-07-14 | 2023-03-31 | 青岛海尔空调电子有限公司 | Control method and system for multi-split air conditioning unit |
| CN112762509A (en) * | 2020-12-31 | 2021-05-07 | 浙江中广电器股份有限公司 | Storage control method for refrigerant during heating of waterless floor heating multi-split air conditioner |
| CN114608189A (en) * | 2022-04-22 | 2022-06-10 | 安徽奥克斯智能电气有限公司 | Refrigerant adjusting method and device and air conditioning system |
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