CN102914027B - Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit - Google Patents
Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit Download PDFInfo
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- CN102914027B CN102914027B CN201210349913.5A CN201210349913A CN102914027B CN 102914027 B CN102914027 B CN 102914027B CN 201210349913 A CN201210349913 A CN 201210349913A CN 102914027 B CN102914027 B CN 102914027B
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Abstract
The invention discloses a control method for preventing a refrigerant of an outdoor unit from bias flowing during the refrigeration of a multi-split air-conditioning unit. The control method comprises the following steps: a. starting and operating a compressor (2) of a part of an outdoor unit (1); b. measuring the temperature Tcm of the middle part of a coil of the outdoor unit (1), measuring the temperature Tdef of the outlet of the coil of the outdoor unit (1), and further calculating the temperature difference delta T of the outlet and the middle part of the coil; c. judging whether delta T is larger than or equal to 4 and whether the temperature Tcm of the middle part of the coil of the outdoor unit (1) is larger than 55 DEG C, if both so, entering step e; if one condition is not met, entering next step; d. measuring the pressure value P of the outlet of the compressor (2) of the outdoor unit (1), and judging whether the pressure value P of the outlet of the compressor (2) is larger than 4Mpa; e. opening an electromagnetic valve (6) on a refrigerant pipe (7) of the outdoor unit (1) which is not operated; and f. operating normally. The control method can adjust automatically while the air-conditioner refrigerates so as to prevent the refrigerant of the outdoor unit from bias flowing.
Description
Technical field
The present invention relates to VRF Air Conditioning System, when being specifically a kind of VRF Air Conditioning System refrigeration, prevent the control method of off-premises station refrigerant bias current.
Background technology
The VRF Air Conditioning System of prior art comprises multiple off-premises station parallel with one another, multiple indoor set parallel with one another and connects two refrigerant circulation house stewards of each indoor set and each off-premises station.Multiple off-premises stations after parallel connection are communicated with the multiple indoor sets after parallel connection by two refrigerant circulation house stewards.
Each off-premises station comprises compressor, oil eliminator, four-way change-over valve, outdoor heat exchanger (being condenser during refrigeration mode), reservoir and gas-liquid separator.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 one end of reservoir, one that the other end and two refrigerants of reservoir circulate in house steward is communicated with by a cooling medium liquid pipe, this cooling medium liquid pipe is provided with magnetic valve, and another root refrigerant circulation house steward in two refrigerant circulation house stewards is communicated with four-way change-over valve the 3rd valve port of each off-premises station, four-way change-over valve the 4th valve port is connected with one end of gas-liquid separator, the other end of gas-liquid separator is communicated with suction port of compressor.
Each indoor set comprises interior organic electronic expansion valve and indoor heat exchanger (being evaporimeter during refrigeration mode), one end of indoor heat exchanger is communicated with one end of interior organic electronic expansion valve, one that the other end and two refrigerants of interior organic electronic expansion valve circulate in house steward is communicated with, and the house steward that circulates is communicated with for the other end and two 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.
The middle part of the heat exchange coil of outdoor heat exchanger is provided with the first temperature inductor, and the outlet of the heat exchange coil of outdoor heat exchanger is provided with the second temperature inductor, and the outlet of compressor is provided with a pressure sensor.Magnetic valve on cooling medium liquid pipe between two above-mentioned temperature inductors, a pressure sensor and reservoir and a refrigerant circulation house steward is all electrically connected with air-conditioning master controller.
VRF Air Conditioning System can regulate the number of the off-premises station of work according to interior machine workload demand, time interior capabilities demand is high, whole off-premises station runs, and time interior capabilities demand is low, only has part off-premises station to run.As fruit part off-premises station longtime running, other off-premises station does not run for a long time, and just easily cause cold-producing medium bias current, the refrigerant of the off-premises station namely run is too much, the off-premises station refrigerant do not run is very few, once the refrigerant of off-premises station is too much, then easily there is high voltage fault, shorten the service life of unit.
Summary of the invention
The technical problem to be solved in the present invention is, provides the control method preventing the bias current of off-premises station refrigerant during a kind of VRF Air Conditioning System refrigeration that can automatically regulate.
Technical solution of the present invention is, prevent the control method of off-premises station refrigerant bias current when providing a kind of VRF Air Conditioning System to freeze, its concrete steps are as follows:
A, VRF Air Conditioning System is adjusted to refrigeration mode, and the start of the compressor of part off-premises station is run a period of time, and other off-premises station is not started shooting;
B, measured the coil pipe middle portion temperature T of this off-premises station by the first temperature inductor in the middle part of the coil pipe of the outdoor heat exchanger of off-premises station that running
cmand temperature-measuring results is sent to air-conditioning master controller; The Coil outlet temperature T of this off-premises station is measured by the second temperature inductor of the coil outlets of the outdoor heat exchanger of this off-premises station
defand temperature-measuring results is sent to air-conditioning master controller, then calculate T
cmdeduct T
defdifference △ T;
C, judge whether △ T is more than or equal to 4 and the coil pipe middle portion temperature T of this off-premises station
cmwhether be greater than 55 DEG C, if two conditions are all satisfied, then enter step e; If two conditions do not meet, then enter step f; If there is a condition not meet, enter next step;
D, measured the compressor delivery pressure value P of this off-premises station by the pressure sensor of the compressor outlet of off-premises station run, and result is sent to air-conditioning master controller, judge whether compressor delivery pressure value P is greater than 4Mpa, if yes then enter step e, if not, then directly step f is entered;
E, the magnetic valve opened on the cooling medium liquid pipe of the off-premises station do not run, until the coil pipe middle portion temperature T of the off-premises station run
cmbe less than 52 DEG C or the compressor delivery pressure value P of off-premises station that runs is less than 3.1Mpa, then close the magnetic valve on the cooling medium liquid pipe of the off-premises station do not run;
F, at interval of a period of time, repeat step b ~ e, until shut down.
This controlling party ratio juris is: during VRF Air Conditioning System refrigerating operaton, find that the middle part of coil pipe and the temperature difference in exit of outdoor heat exchanger are greater than 4 DEG C, just illustrate that this off-premises station is in normal refrigeration, once the compressor delivery pressure of this off-premises station is excessive or outdoor heat exchanger coil pipe middle portion temperature is too high, just can judge that the refrigerant of this off-premises station is too much, there is bias current, now, open the magnetic valve of the cooling medium liquid pipe of off-duty off-premises station, the reservoir that the refrigerant of the too much off-premises station of refrigerant just can be made to enter off-duty off-premises station from this magnetic valve and outdoor heat exchanger, refrigerant in the off-premises station making the refrigerant that running too much reduces, pressure reduces, alleviate and improve refrigerant bias current.
Adopt above method, prevent the control method of off-premises station refrigerant bias current compared with prior art during VRF Air Conditioning System refrigeration of the present invention, have the following advantages:
By this control method, effectively can alleviate the situation improving the bias current of VRF Air Conditioning System different off-premises station refrigerant, there is high voltage fault in the off-premises station avoiding refrigerant many, extend the service life of unit, the off-premises station refrigeration simultaneously preventing refrigerant very few is bad, and the several judgement data in this control method, as coil pipe middle portion temperature T
cmwhether be greater than 55 DEG C, whether compressor delivery pressure value P is greater than 4Mpa, △ T whether is more than or equal to 4 and judge that judgement data compression machine exit pressure levels P that adjustment process terminates is less than the coil pipe middle portion temperature T of 3.1Mpa, off-premises station
cmbe less than the optimum data that 52 DEG C of grades are all through repetition test screening and checking, above-mentioned a series of data, namely can not too sensitivity cause crossing too early repeatedly to regulate wasting unit energy, also adjustment will be caused to occur high voltage fault not in time due to too blunt.
As improvement, a period of time described in step a refers to 5 ~ 10 minutes, namely compressor operating started to regulate Biased flow phenomenon after 5 ~ 10 minutes, because after this VRF Air Conditioning System runs a period of time, just started to occur Biased flow phenomenon, proved by test, running after 5 ~ 10 minutes regulates relatively accurately, too early regulates, not there will be bias current, need not regulate, the high voltage fault that the words bias current regulated too late causes causes harmful effect.
As improving again, a period of time described in step a refers to 10 minutes, namely compressor operating 10 minutes these time points start to regulate Biased flow phenomenon, proved by repetition test, within 10 minutes, this time point is the most accurate, too early regulates, not there will be bias current, need not regulate, the high voltage fault that the words bias current regulated too late causes causes harmful effect.
As improving further, a period of time described in step f refers to 10 ~ 30 seconds again, namely each regulate be spaced apart 10 ~ 30 seconds, better to the regulating effect of bias current, this is through, and test draws, if regulate too frequent, there is no need; If regulate number of times very little, the dynamics regulated bias current is inadequate.
As also further improving, a period of time described in step e refers to 15 seconds, namely regulates once at interval of 15 seconds, best to the regulating effect of bias current, and this is through, and repetition test draws, if regulate too frequent, there is no need; If regulate number of times very little, the dynamics regulated bias current is inadequate.
Accompanying drawing explanation
Fig. 1 prevents the systematic schematic diagram of the control method of off-premises station refrigerant bias current when being VRF Air Conditioning System of the present invention refrigeration.
Shown in figure 1, off-premises station, 2, compressor, 3, outdoor heat exchanger, the 4, first temperature inductor, 5, pressure sensor, 6, magnetic valve, 7, cooling medium liquid pipe, 8, reservoir, 9, refrigerant circulation house steward, the 10, second temperature inductor.
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, prevent the control method of off-premises station refrigerant bias current during VRF Air Conditioning System refrigeration of the present invention, its concrete steps are as follows.
A, VRF Air Conditioning System is adjusted to refrigeration mode, and the compressor 2 of part off-premises station 1 is started shooting runs a period of time, and other off-premises station 1 is not started shooting; A period of time in this step refers to 5 ~ 10 minutes, preferably 10 minutes.
B, measured the coil pipe middle portion temperature T of this off-premises station 1 by the first temperature inductor 4 in the middle part of the coil pipe of the outdoor heat exchanger 3 of off-premises station 1 that running
cmand temperature-measuring results is sent to air-conditioning master controller; The Coil outlet temperature T of this off-premises station 1 is measured by the second temperature inductor 10 of the coil outlets of the outdoor heat exchanger 3 of this off-premises station 1
defand temperature-measuring results is sent to air-conditioning master controller, then calculate T
cmdeduct T
defdifference △ T; Wherein, two data of each off-premises station 1 run are one group, and the master controller of air-conditioning is by the one group of data i.e. T of this off-premises station 1 of same off-premises station 1
cmdeduct T
defobtain difference △ T.
C, judge whether △ T is more than or equal to 4 and the coil pipe middle portion temperature T of this off-premises station 1
cmwhether be greater than 55 DEG C, if two conditions are all satisfied, then enter step e; If two conditions do not meet, then enter step f; If there is a condition not meet, enter next step; In particular, for each off-premises station 1 run, must judge that the △ T of this off-premises station 1 is more than or equal to 4 and the T of this off-premises station 1
cmbe greater than 55 DEG C, just can enter step e and regulate, if one in two conditions does not meet, then enter next step and continue judge and do not regulate; If the △ T of this off-premises station 1 is less than 4 and the T of this off-premises station 1
cmbe less than 55 DEG C, just enter step f and normally run.
The compressor 2 exit pressure levels P of this off-premises station 1 measured by the pressure sensor 5 that d, the compressor 2 passing through the off-premises station 1 run export, and result is sent to air-conditioning master controller, judge whether compressor 2 exit pressure levels P is greater than 4Mpa, if yes then enter step e, if not, then directly step f is entered.
E, the magnetic valve 6 opened on the cooling medium liquid pipe 7 of the off-premises station 1 do not run, until the coil pipe middle portion temperature T of the off-premises station 1 run
cmbe less than 52 DEG C or the compressor 2 exit pressure levels P of off-premises station 1 that runs is less than 3.1Mpa, then close the magnetic valve 6 on the cooling medium liquid pipe 7 of the off-premises station 1 do not run.This magnetic valve 6 is the magnetic valves 6 on the cooling medium liquid pipe 7 between the reservoir 8 and a refrigerant circulation house steward 9 of VRF Air Conditioning System of off-premises station 1, once open the magnetic valve 6 of the off-premises station 1 do not run, refrigerant just can enter reservoir 8 and the outdoor heat exchanger 3 of the off-premises station 1 do not run through this magnetic valve 6.As the coil pipe middle portion temperature T of the off-premises station 1 run
cmbeing less than 52 DEG C or the compressor 2 exit pressure levels P of off-premises station 1 that runs is less than under these two conditions of 3.1Mpa meet the prerequisite of, and the magnetic valve 6 of just cutting out the off-premises station 1 do not run terminates adjustment.
F, at interval of a period of time, repeat step b ~ e, until shut down; A period of time in this step refers to 10 ~ 30 seconds, preferably 15 seconds.
Claims (5)
1. prevent a control method for off-premises station refrigerant bias current during VRF Air Conditioning System refrigeration, it is characterized in that: its concrete steps are as follows:
A, VRF Air Conditioning System is adjusted to refrigeration mode, and the start of the compressor (2) of part off-premises station (1) is run a period of time, and other off-premises station (1) is not started shooting;
B, measured the coil pipe middle portion temperature T of this off-premises station (1) by the first temperature inductor (4) in the middle part of the coil pipe of the outdoor heat exchanger (3) of off-premises station (1) that running
cmand temperature-measuring results is sent to air-conditioning master controller; The Coil outlet temperature T of this off-premises station (1) is measured by second temperature inductor (10) of the coil outlets of the outdoor heat exchanger (3) of this off-premises station (1)
defand temperature-measuring results is sent to air-conditioning master controller, then calculate T
cmdeduct T
defdifference △ T;
C, judge whether △ T is more than or equal to 4 DEG C and the coil pipe middle portion temperature T of this off-premises station (1)
cmwhether be greater than 55 DEG C, if two conditions are all satisfied, then enter step e; If two conditions do not meet, then enter step f; If there is a condition not meet, enter next step;
Compressor (2) the exit pressure levels P of this off-premises station (1) measured by the pressure sensor (5) that d, the compressor (2) passing through the off-premises station (1) run export, and result is sent to air-conditioning master controller, judge whether compressor (2) exit pressure levels P is greater than 4Mpa, if yes then enter step e, if not, then directly step f is entered;
E, the magnetic valve (6) opened on the cooling medium liquid pipe (7) of the off-premises station (1) do not run, until the coil pipe middle portion temperature T of the off-premises station (1) run
cmbe less than 52 DEG C or compressor (2) the exit pressure levels P of off-premises station (1) that runs is less than 3.1Mpa, then close the magnetic valve (6) on the cooling medium liquid pipe (7) of the off-premises station (1) do not run;
F, at interval of a period of time, repeat step b ~ e, until shut down.
2. prevent the control method of off-premises station refrigerant bias current during VRF Air Conditioning System refrigeration according to claim 1, it is characterized in that: a period of time described in step a refers to 5 ~ 10 minutes.
3. prevent the control method of off-premises station refrigerant bias current during VRF Air Conditioning System refrigeration according to claim 2, it is characterized in that: a period of time described in step a refers to 10 minutes.
4. prevent the control method of off-premises station refrigerant bias current during VRF Air Conditioning System refrigeration according to claim 1, it is characterized in that: a period of time described in step f refers to 10 ~ 30 seconds.
5. prevent the control method of off-premises station refrigerant bias current during VRF Air Conditioning System refrigeration according to claim 4, it is characterized in that: a period of time described in step f refers to 15 seconds.
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| CN201210349913.5A CN102914027B (en) | 2012-09-20 | 2012-09-20 | Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit |
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| CN201210349913.5A CN102914027B (en) | 2012-09-20 | 2012-09-20 | Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit |
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| CN102914027B true CN102914027B (en) | 2015-01-21 |
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| CN104344456B (en) * | 2013-07-29 | 2017-03-29 | 广东美的暖通设备有限公司 | The uneven control method of multi-online air-conditioning system and its off-premises station coolant distribution |
| CN104456731B (en) * | 2014-11-21 | 2017-10-20 | 特灵空调系统(中国)有限公司 | Multi-connected machine |
| CN104729025B (en) * | 2015-04-09 | 2017-09-29 | 宁波奥克斯电气股份有限公司 | The dynamic equilibrium control method of refrigerant when VRF Air Conditioning System is freezed |
| CN104776659A (en) * | 2015-04-14 | 2015-07-15 | 四川长虹空调有限公司 | Multi-split air conditioner refrigerant balancing control method and air conditioning system for achieving same |
| CN105423495B (en) * | 2015-12-16 | 2018-03-27 | 美的集团武汉制冷设备有限公司 | Air conditioner and its anti-freeze control method and device |
| CN105546736B (en) * | 2015-12-23 | 2018-07-06 | 宁波奥克斯电气股份有限公司 | The method for solving the indoor heat exchanger hydrops of multi-connected machine during heating |
| CN105526676B (en) * | 2015-12-23 | 2018-07-27 | 宁波奥克斯电气股份有限公司 | Judge heating when multi-connected machine indoor heat exchanger whether the method for hydrops |
| CN113847684A (en) * | 2021-09-10 | 2021-12-28 | 珠海格力电器股份有限公司 | Compressor bias current processing method and device, storage medium and electronic equipment |
| CN114484720B (en) * | 2022-01-17 | 2024-06-07 | 青岛海尔空调电子有限公司 | Method and device for controlling air conditioner, air conditioner and storage medium |
| CN114674063B (en) * | 2022-04-22 | 2023-10-20 | 宁波奥克斯电气股份有限公司 | Air conditioner control method and device and air conditioner system |
| CN115614910A (en) * | 2022-10-11 | 2023-01-17 | 珠海格力电器股份有限公司 | Refrigerant bias flow processing method and device and modular air conditioning unit |
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| JP4032634B2 (en) * | 2000-11-13 | 2008-01-16 | ダイキン工業株式会社 | Air conditioner |
| CN1920423A (en) * | 2005-08-22 | 2007-02-28 | 乐金电子(天津)电器有限公司 | Air conditioner temperature control apparatus and method therefor |
| JP4135766B2 (en) * | 2006-09-19 | 2008-08-20 | ダイキン工業株式会社 | Mediation device for air conditioning control, air conditioning control system, air conditioning control method, and air conditioning control program |
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Address after: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee after: NINGBO AUX ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before: Ningbo AUX Electric Co., Ltd. |