CN102353120A - Control method for preventing refrigerant partial flowing in refrigeration of multi-connection-type air-conditioning unit - Google Patents
Control method for preventing refrigerant partial flowing in refrigeration of multi-connection-type air-conditioning unit Download PDFInfo
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- CN102353120A CN102353120A CN2011102550661A CN201110255066A CN102353120A CN 102353120 A CN102353120 A CN 102353120A CN 2011102550661 A CN2011102550661 A CN 2011102550661A CN 201110255066 A CN201110255066 A CN 201110255066A CN 102353120 A CN102353120 A CN 102353120A
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Abstract
The invention discloses a control method for preventing refrigerant partial flowing in refrigeration of a multi-connection-type air-conditioning unit. The method comprises the following steps: a. starting up; b. measuring the temperature T0 in the middle of an indoor heat exchanger (2), wherein the indoor unit with the highest temperature T0 has minimum refrigerants, and the indoor unit with the lowest temperature T0 has maximal refrigerants; c. measuring the outlet temperature T1min of the indoor heat exchanger (2) of the indoor machine with minimum refrigerants, and measuring the outlet temperature T1max of the indoor heat exchanger (2) of the indoor machine with maximal refrigerants, and calculating the difference delta T between the outlet temperature T1min and the outlet temperature T1max; d. determining whether the delta T is greater than or equal to 5, if yes, increasing the aperture of an inner unit electronic expansion valve (4) of the indoor machine with the minimum refrigerants, and decreasing the aperture of the inner unit electronic expansion valve (4) of the indoor machine with the maximal refrigerants; and e. repeating the steps b-d at set intervals of time until power off. Through the control method, not only can the refrigerant return liquid be prevented from damaging the compressor, but also the good refrigeration effect of each indoor machine can be ensured.
Description
Technical field
The present invention relates to VRF Air Conditioning System, prevent the control method of refrigerant bias current when specifically being a kind of VRF Air Conditioning System refrigeration.
Background technology
The VRF Air Conditioning System of prior art comprises one or more off-premises stations, a plurality of indoor set parallel with one another and two refrigerant circulation house stewards that connect each indoor set and each off-premises station.If off-premises station is one, this off-premises station is communicated with through a plurality of indoor sets after two refrigerants circulation house stewards and the parallel connection; If off-premises station is a plurality of, the parallel connection of then a plurality of off-premises stations, the off-premises station after the parallel connection is communicated with through the indoor set after two refrigerants circulation house stewards and the parallel connection.
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 an end of oil eliminator; The other end of oil eliminator is communicated with 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 an end of reservoir, and one among the other end of reservoir and the two refrigerants circulation house stewards is communicated with, and another root refrigerant pipe among two refrigerants 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 an end of gas-liquid separator, and the other end of gas-liquid separator is communicated with the suction port of compressor.During refrigeration mode, first valve port of four-way change-over valve is communicated with second valve port, and the 3rd valve port is communicated with the 4th valve port, and promptly refrigerant is along compressor, outdoor heat exchanger, indoor heat exchanger, this route circulation of compressor.
Organic electronic expansion valve and indoor heat exchanger (being evaporimeter during refrigeration mode) in each indoor set comprises; One end of indoor heat exchanger is communicated with an end of interior organic electronic expansion valve; One among the other end of interior organic electronic expansion valve and the two refrigerants circulation house stewards is communicated with, and another root refrigerant pipe that the other end of indoor heat exchanger and two refrigerants circulate among the house stewards is communicated with.The inlet of indoor heat exchanger, middle part and outlet are respectively equipped with three temperature sensors.Three above-mentioned temperature sensors and interior organic electronic expansion valve all are electrically connected with the air-conditioning master controller.
VRF Air Conditioning System comprises a plurality of indoor sets, be at most 64 indoor sets, and each indoor set is different with the distance of off-premises station; So air-conditioning long-time running; More with off-premises station apart from the refrigerant of near indoor set, less with the indoor-unit cooling-medium of off-premises station distance, refrigerant bias current phenomenon promptly appears.Like this, the liquid refrigerants in the more indoor set of refrigerant can not be evaporated to gaseous coolant fully, can return liquid to compressor, returns liquid for a long time and can dilute lubricating oil in the compressor, causes the compressor oil film to be destroyed, and finally damages compressor; And the poor refrigerating efficiency of the less indoor set of refrigerant.
Summary of the invention
The technical problem that the present invention will solve is, provides a kind of and can avoid refrigerant to return liquid damaging the control method that prevents the refrigerant bias current when compressor can guarantee the VRF Air Conditioning System refrigeration of good refrigeration effect of each indoor set again.
Technical solution of the present invention is, prevents the control method of refrigerant bias current when a kind of VRF Air Conditioning System refrigeration is provided, and its concrete steps are following:
A, with the compressor of off-premises station start operation a period of time;
The temperature T at the indoor heat exchanger middle part of each indoor set of temperature sensor measurement at b, the middle part of the indoor heat exchanger through each indoor set
0, temperature-measuring results is sent to the air-conditioning master controller, the temperature T at indoor heat exchanger middle part
0The highest indoor set is the minimum indoor set of refrigerant, the temperature T at indoor heat exchanger middle part
0Minimum indoor set is the maximum indoor set of refrigerant;
The temperature T of the outlet of the indoor heat exchanger of this indoor set of temperature sensor measurement of the outlet of c, the indoor heat exchanger through the minimum indoor set of refrigerant
1min, the temperature T of the outlet of the indoor heat exchanger of this indoor set of temperature sensor measurement of the outlet of the indoor heat exchanger through the maximum indoor set of refrigerant
1max, above-mentioned two temperature values are passed to the air-conditioning master controller, and calculate T
1minDeduct T
1maxDifference △ T;
D, whether judge △ T more than or equal to 5, if the aperture of the interior organic electronic expansion valve of then that refrigerant is minimum indoor set increases, the aperture of the interior organic electronic expansion valve of simultaneously that refrigerant is maximum indoor sets reduces; If not, then do not regulate;
E, every certain interval of time, repeating step b ~ d is until shutdown.
The principle of this control method is: the ratio of the refrigerant of the evaporation in the indoor heat exchanger of the indoor set that refrigerant is minimum is maximum, and the intensification amplitude is also maximum, so the middle part temperature T of the indoor heat exchanger of this indoor set
0The highest; In like manner, the ratio of the refrigerant that evaporates in the indoor heat exchanger of the indoor set that refrigerant is maximum is minimum, and the intensification amplitude is also minimum, so the middle part temperature T of the indoor heat exchanger of this indoor set
0Minimum; So with T
0The aperture of the interior organic electronic expansion valve of the highest indoor set increases, with T
0The interior organic electronic expansion valve opening of minimum indoor set reduces, and just can regulate the bias current phenomenon of each indoor set.
Adopt above method, the control method that prevents the refrigerant bias current during VRF Air Conditioning System of the present invention refrigeration compared with prior art has the following advantages:
After this air-conditioning unit operation a period of time; Just can increase at regular intervals the minimum indoor set of refrigerant cold medium flux, reduce the cold medium flux of the maximum indoor set of refrigerant; Be about to the cold medium flux balance of two the most serious indoor sets of bias current, like this, after repeatedly regulating; Can effectively alleviate and improve refrigerant bias current phenomenon; Make the coolant quantity in each indoor set balanced, avoid the more indoor set of refrigerant, avoid the drawback of the less indoor set poor refrigerating efficiency of refrigerant simultaneously because compressor is returned liquid and damages compressor.
As improvement, described a period of time of step a is meant 10 ~ 30 minutes, and promptly compressor operating begins to regulate the bias current phenomenon after 10 ~ 30 minutes; Because this VRF Air Conditioning System after operation a period of time, just begins to occur the bias current phenomenon, through evidence; It is more accurate to regulate in 10 ~ 30 minutes these time periods, too early regulates, and bias current can not occur; Need not regulate, backflow, poor refrigerating efficiency that the words bias current of regulating too late causes have caused harmful effect.
As improving, described a period of time of step a is meant 15 minutes again, and promptly 15 minutes these time points of compressor operating begin to regulate the bias current phenomenon; Prove through repetition test; This time point was the most accurate in 15 minutes, too early regulated, and bias current can not occur; Need not regulate, backflow, poor refrigerating efficiency that the words bias current of regulating too late causes have caused harmful effect.
As also improving, the described aperture of steps d reduces to be meant, multiply by any one number in 0.9 ~ 0.95 with original aperture; The described aperture increase of steps d is meant, multiply by any one number in 1.05 ~ 1.1 with original aperture; Through evidence, originally 0.9 ~ 0.95 of aperture turn the maximum indoor set of refrigerant down, effect is more satisfactory; Equally, originally 1.05 ~ 1.1 of aperture increase the less indoor set of refrigerant, and effect is more satisfactory.
As further improvement, the described aperture of steps d reduces to be meant, multiply by 0.95 with original aperture; The described aperture increase of steps d is meant, multiply by 1.05 with original aperture; Prove through repetition test, originally 0.95 of aperture turn the maximum indoor set of refrigerant down, effect is the most desirable; Equally, originally 1.05 of aperture increase the less indoor set of refrigerant, and effect is the most desirable.
As further improving, described a period of time of step e is meant 10 ~ 30 seconds again, and that promptly regulates is spaced apart 10 ~ 30 seconds at every turn, and better to the regulating effect of bias current, this draws through overtesting, if adjusting is too frequent, there is no need; If regulate number of times very little, the dynamics that bias current is regulated is not enough.
As also further improving, described a period of time of step e is meant 15 seconds, and promptly every interval was regulated once in 15 seconds, and best to the regulating effect of bias current, this draws through repetition test, if adjusting is too frequent, there is no need; If regulate number of times very little, the dynamics that bias current is regulated is not enough.
Description of drawings
Fig. 1 prevents the systematic schematic diagram of the control method of refrigerant bias current when being VRF Air Conditioning System of the present invention refrigeration.
Shown in the figure 1, compressor, 2, indoor heat exchanger, 3, temperature sensor, 4, interior organic electronic expansion valve.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
As shown in Figure 1, VRF Air Conditioning System of the present invention prevents the control method of refrigerant bias current when freezing, and its concrete steps are following:
A, with 1 start operation a period of time of the compressor of off-premises station, be meant that specifically the compressor of any one off-premises station of this VRF Air Conditioning System is started shooting postrun a period of time.
A period of time among the step a is meant 10 ~ 30 minutes, preferred 15 minutes.
The temperature sensor 3 at b, indoor heat exchanger 2 middle parts through each indoor set is measured the temperature T at indoor heat exchanger 2 middle parts of each indoor set
0, temperature-measuring results is sent to the air-conditioning master controller, the temperature T at indoor heat exchanger 2 middle parts
0The highest indoor set is the minimum indoor set of refrigerant, the temperature T at indoor heat exchanger 2 middle parts
0Minimum indoor set is the maximum indoor set of refrigerant.
The particular location at indoor heat exchanger 2 middle parts in this step is meant, the mid-length point of the coil pipe in the indoor heat exchanger, and the temperature sensor in this step is located in this position, and the temperature value of this position of measuring is T
0
The temperature sensor 3 of the outlet of c, the indoor heat exchanger 2 through the minimum indoor set of refrigerant is measured the temperature T of outlet of the indoor heat exchanger 2 of these indoor sets
1min, the temperature sensor 3 of the outlet of the indoor heat exchanger 2 through the maximum indoor set of refrigerant is measured the temperature T of outlet of the indoor heat exchanger 2 of these indoor sets
1max, above-mentioned two temperature values are passed to the air-conditioning master controller, and calculate T
1minDeduct T
1maxDifference △ T.
D, whether judge △ T more than or equal to 5, if the aperture of the interior organic electronic expansion valve 4 of then that refrigerant is minimum indoor set increases, the aperture of the interior organic electronic expansion valve 4 of simultaneously that refrigerant is maximum indoor sets reduces; If not, then do not regulate.
The described aperture of steps d reduces to be meant, multiply by any one number in 0.9 ~ 0.95 with original aperture, preferably multiply by 0.95; The described aperture increase of steps d is meant, multiply by any one number in 1.05 ~ 1.1 with original aperture, preferably multiply by 1.05; During like refrigeration mode, the aperture of the interior organic electronic expansion valve 4 of each indoor set generally all was 120 steps, so; The aperture of the interior organic electronic expansion valve 4 of the indoor set of the less needs increase of refrigerant aperture is 120 steps to multiply by 1.05; Promptly 126 the step, and the more needs of refrigerant reduce the aperture of the indoor electric expansion valve 4 of aperture be 120 the step multiply by 0.95, promptly 114 the step.
E, every certain interval of time, repeating step b ~ d, until shutdown, the certain interval of time in this step can be any one time in 10 ~ 30 seconds, preferred interval 15 seconds.
Claims (7)
1. prevent the control method of refrigerant bias current when a VRF Air Conditioning System is freezed, it is characterized in that: its concrete steps are following:
A, with the compressor (1) of off-premises station start operation a period of time;
The temperature sensor (3) at b, the middle part of the indoor heat exchanger (2) through each indoor set is measured the temperature T at indoor heat exchanger (2) middle part of each indoor set
0, temperature-measuring results is sent to the air-conditioning master controller, the temperature T at indoor heat exchanger (2) middle part
0The highest indoor set is the minimum indoor set of refrigerant, the temperature T at indoor heat exchanger (2) middle part
0Minimum indoor set is the maximum indoor set of refrigerant;
The temperature sensor (3) of the outlet of c, the indoor heat exchanger (2) through the minimum indoor set of refrigerant is measured the temperature T of outlet of the indoor heat exchanger (2) of this indoor set
1min, the temperature sensor (3) of the outlet of the indoor heat exchanger (2) through the maximum indoor set of refrigerant is measured the temperature T of outlet of the indoor heat exchanger (2) of this indoor set
1max, above-mentioned two temperature values are passed to the air-conditioning master controller, and calculate T
1minDeduct T
1maxDifference △ T;
D, whether judge △ T more than or equal to 5, if the aperture of the interior organic electronic expansion valve (4) of then that refrigerant is minimum indoor set increases, the aperture of the interior organic electronic expansion valve (4) of simultaneously that refrigerant is maximum indoor sets reduces; If not, then do not regulate;
E, every certain interval of time, repeating step b ~ d is until shutdown.
2. VRF Air Conditioning System according to claim 1 prevents the control method of refrigerant bias current when freezing, it is characterized in that: described a period of time of step a is meant 10 ~ 30 minutes.
3. VRF Air Conditioning System according to claim 2 prevents the control method of refrigerant bias current when freezing, it is characterized in that: described a period of time of step a is meant 15 minutes.
4. VRF Air Conditioning System according to claim 1 prevents the control method of refrigerant bias current when freezing, it is characterized in that: the described aperture of steps d reduces to be meant, multiply by any one number in 0.9 ~ 0.95 with original aperture; The described aperture increase of steps d is meant, multiply by any one number in 1.05 ~ 1.1 with original aperture.
5. VRF Air Conditioning System according to claim 4 prevents the control method of refrigerant bias current when freezing, it is characterized in that: the described aperture of steps d reduces to be meant, multiply by 0.95 with original aperture; The described aperture increase of steps d is meant, multiply by 1.05 with original aperture.
6. VRF Air Conditioning System according to claim 1 prevents the control method of refrigerant bias current when freezing, it is characterized in that: described a period of time of step e is meant 10 ~ 30 seconds.
7. VRF Air Conditioning System according to claim 6 prevents the control method of refrigerant bias current when freezing, it is characterized in that: described a period of time of step e is meant 15 seconds.
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| CN102914026A (en) * | 2012-09-20 | 2013-02-06 | 宁波奥克斯电气有限公司 | Control method for preventing refrigerant of outdoor unit of multi-linkage air conditioning unit from deflecting during heating |
| CN104344456A (en) * | 2013-07-29 | 2015-02-11 | 广东美的暖通设备有限公司 | Multi-split air conditioning system and outdoor unit refrigerant distribution unevenness adjusting method thereof |
| CN105865096A (en) * | 2016-04-29 | 2016-08-17 | 宁波奥克斯电气股份有限公司 | Method and unit for improving heating effect of multi-connected machine set |
| CN106902907A (en) * | 2017-02-07 | 2017-06-30 | 深圳市瑞蓝技术有限公司 | A kind of environmental test chamber system of the runoff of intermediary when chilling, method and application |
| CN109708271A (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 outer machine system in parallel |
| CN111780382A (en) * | 2020-07-15 | 2020-10-16 | 海信（山东）空调有限公司 | Air conditioner |
| CN112567187A (en) * | 2018-09-13 | 2021-03-26 | 三菱重工制冷空调系统株式会社 | Control device, heat source system, method for calculating lower limit value of cooling water inlet temperature, control method, and program |
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| CN111780382A (en) * | 2020-07-15 | 2020-10-16 | 海信（山东）空调有限公司 | Air conditioner |
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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. |