CN102278804B - Control method for preventing bias flow of refrigerants during heating of multi-connected air conditioning unit - Google Patents
Control method for preventing bias flow of refrigerants during heating of multi-connected air conditioning unit Download PDFInfo
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- CN102278804B CN102278804B CN 201110255060 CN201110255060A CN102278804B CN 102278804 B CN102278804 B CN 102278804B CN 201110255060 CN201110255060 CN 201110255060 CN 201110255060 A CN201110255060 A CN 201110255060A CN 102278804 B CN102278804 B CN 102278804B
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Abstract
The invention discloses a control method for preventing bias flow of refrigerants during heating of a multi-connected air conditioning unit. The method comprises the following steps of: a, starting the multi-connected air conditioning unit; b, measuring a middle temperature T0 of an indoor heat exchanger (2), wherein an indoor machine of which the T0 is the highest has the most refrigerants, and the indoor machine of which the T0 is the lowest has the fewest refrigerants; c, measuring an outlet temperature T1min of the indoor heat exchanger (2) of the indoor machine which has the fewest refrigerants, measuring an outlet temperature T1max of the indoor heat exchanger (2) of the indoor machine which has the most refrigerants, and calculating a difference value delta T between the T1min and the T1max; d, judging whether the delta T is more than or equal to 5, if so, increasing the aperture of an indoor machine electronic expansion valve (4) of the indoor machine which has the fewest refrigerants, and decreasing the aperture of the indoor machine electronic expansion valve (4) of the indoor machine which has the most refrigerants; and e, repeating the steps b to d at certain intervals until the multi-connected air conditioning unit is shut down. By the method, heating effect of each indoor machine is better, and waste is avoided.
Description
Technical field
The present invention relates to VRF Air Conditioning System, specifically is the control method that a kind of VRF Air Conditioning System prevents the refrigerant bias current when heating.
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 a plurality of indoor sets after the parallel connection by two refrigerants circulation house stewards; If off-premises station is a plurality of, then a plurality of off-premises station parallel connections, the off-premises station after the parallel connection is communicated with indoor set after the parallel connection by two refrigerants circulation house stewards.
Each off-premises station comprises compressor, oil eliminator, four-way change-over valve, outdoor heat exchanger (being evaporimeter during heating mode), throttling arrangement, 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, the 3rd valve port of four-way change-over valve is communicated with a refrigerant pipe among two refrigerants circulation house stewards, another root refrigerant pipe among two refrigerants circulation house steward is communicated with an end of reservoir, one end of the other end throttling arrangement of reservoir is communicated with, the other end of throttling arrangement is communicated with an end of outdoor heat exchanger, the other end of outdoor heat exchanger is communicated with second valve port of four-way change-over valve, the 4th valve port of four-way change-over valve 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 heating mode, first valve port of four-way change-over valve is communicated with the 3rd valve port, and second valve port is communicated with the 4th valve port, and namely refrigerant is along compressor, indoor heat exchanger, outdoor heat exchanger, this route circulation of compressor.
Organic electronic expansion valve and indoor heat exchanger (being condenser during heating 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 entrance 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.
Multi-connected air conditioner comprises a plurality of indoor sets, mostly be 64 indoor sets most, and each indoor set is different with the distance of off-premises station, so air-conditioning long-time running, more apart from the refrigerant of near indoor set with off-premises station, less with the indoor-unit cooling-medium of off-premises station distance, refrigerant bias current phenomenon namely appears.In case refrigerant bias current, the more off-premises station of refrigerant are piled up refrigerant and too much caused waste, and the heating effect of the less indoor set of refrigerant is very poor, and can't guarantee that this defective of heating effect of each indoor set can have a strong impact on the promotion and application of multi-connected air conditioner.
Summary of the invention
The technical problem to be solved in the present invention is, the control method of refrigerant bias current is provided when providing a kind of heating effect that had not only guaranteed each indoor set all better but also can wasting VRF Air Conditioning System not heat.
Technical solution of the present invention is, the control method of refrigerant bias current is provided when providing a kind of VRF Air Conditioning System to heat, and its concrete steps are as follows:
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 by 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 maximum indoor set of refrigerant, the temperature T at indoor heat exchanger middle part
0Minimum indoor set is the minimum 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 by 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 by the maximum indoor set of refrigerant
1max, above-mentioned two temperature values are passed to the air-conditioning master controller, and calculate T
1maxDeduct T
1minDifference △ T;
D, whether judge △ T more than or equal to 5, if then the aperture of the interior organic electronic expansion valve of the indoor set that refrigerant is minimum increases, the aperture of the interior organic electronic expansion valve of the indoor set that refrigerant is maximum reduces simultaneously; If not, then do not regulate;
E, every certain interval of time, repeating step b ~ d is until shutdown.
This controlling party ratio juris is: the ratio maximum of the refrigerant of the condensation in the indoor heat exchanger of the indoor set that refrigerant is minimum, cooling extent are also maximum, so the middle part temperature T of the indoor heat exchanger of this indoor set
0Minimum; In like manner, the ratio minimum of the refrigerant of condensation in the indoor heat exchanger of the indoor set that refrigerant is maximum, cooling extent is also minimum, so the middle part temperature T of the indoor heat exchanger of this indoor set
0The highest; So with T
0The aperture of the interior organic electronic expansion valve of minimum indoor set increases, with T
0The interior organic electronic expansion valve opening of the highest indoor set reduces, and just can regulate the bias current phenomenon of each indoor set.
Adopt above method, VRF Air Conditioning System of the present invention prevents the refrigerant bias current when heating control method compared with prior art has the following advantages:
After this air-conditioning unit operation a period of time, just can increase the cold medium flux of the minimum indoor set of refrigerant at regular intervals, 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 the bias current phenomenon, make coolant quantity equilibrium in each indoor set, avoid the more indoor set of refrigerant to cause waste, the more important thing is the drawback of avoiding the less indoor set heating effect difference of refrigerant, make that the heating effect of each indoor set is all good, promote the promotion and application of VRF Air Conditioning System.
As improvement, described a period of time of step a refers to 10 ~ 30 minutes, be that 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, by evidence, it is more accurate that 10 ~ 30 minutes these time periods began to regulate, and too early regulates, and bias current can not occur, need not regulate, the heating effect difference that causes of the words bias current of Tiao Jieing has caused harmful effect too late.
As improving again, described a period of time of step a refers to 15 minutes, be that compressor operating begins to regulate the bias current phenomenon after 15 minutes, prove by repetition test, this time point was the most accurate in 15 minutes, too early regulated, and bias current can not occur, need not regulate, the heating effect difference that causes of the words bias current of Tiao Jieing has caused harmful effect too late.
As also improving, the described aperture of steps d reduces to refer to, any one is several with original aperture multiply by between 0.9 ~ 0.95; The described aperture of steps d increases and refers to, any one is several with original aperture multiply by between 1.05 ~ 1.1; By evidence, originally any one number of multiply by in 0.9 ~ 0.95 this scope of aperture is turned the maximum indoor set of refrigerant down, and effect is more satisfactory; Equally, originally any one number of multiply by in 1.05 ~ 1.1 these scopes of aperture increases the less indoor set of refrigerant, and effect is more satisfactory.
As further improvement, the described aperture of steps d reduces to refer to, multiply by 0.95 with original aperture; The described aperture increase of steps d refers to, multiply by 1.05 with original aperture; Prove that by 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 improvement, described a period of time of step e refers to 10 ~ 30 seconds, namely each regulate be spaced apart 10 ~ 30 seconds any one time in the scope, better to the regulating effect of bias current, this draws through overtesting, if regulate too frequently, 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 refers to 15 seconds, and namely 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 is the systematic schematic diagram that VRF Air Conditioning System of the present invention prevents the control method of refrigerant bias current when heating.
Shown in the figure 1, compressor, 2, indoor heat exchanger, 3, temperature sensor, 4, interior organic electronic expansion valve.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, VRF Air Conditioning System of the present invention prevents the control method of refrigerant bias current when heating, and its concrete steps are as follows:
A, with compressor 1 start operation a period of time of off-premises station, specifically refer to compressor start operation a period of time of any one off-premises station of this VRF Air Conditioning System.
Described a period of time of step a refers to 10 ~ 30 minutes, preferred 15 minutes.
The temperature sensor 3 at b, indoor heat exchanger 2 middle parts by 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 maximum indoor set of refrigerant, the temperature T at indoor heat exchanger 2 middle parts
0Minimum indoor set is the minimum indoor set of refrigerant.
The particular location at indoor heat exchanger 2 middle parts in this step refers to, the mid-length point of the coil pipe in the indoor heat exchanger 2, 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 by 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 by 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
1maxDeduct T
1minDifference △ T.
D, whether judge △ T more than or equal to 5, if then the aperture of the interior organic electronic expansion valve 4 of the indoor set that refrigerant is minimum increases, the aperture of the interior organic electronic expansion valve 4 of the indoor set that refrigerant is maximum reduces simultaneously; If not, then do not regulate.
The described aperture of steps d reduces to refer to, multiply by any one number between 0.9 ~ 0.95 with original aperture, preferably multiply by 0.95; The described aperture increase of steps d refers to, with original aperture multiply by between 1.05 ~ 1.1 any one the number, preferably multiply by 1.05, during as heating mode, the aperture of the interior organic electronic expansion valve 4 of each indoor set generally all was 350 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 350 steps to multiply by 1.05, roughly be 368 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, roughly be 332 the step.
E, every certain interval of time, repeating step b ~ d, until shutdown, 10 ~ 30 seconds any one interior time of this scope of the certain interval of time preferred interval in this step, preferred 15 seconds.
Claims (7)
1. prevent the control method of refrigerant bias current when a VRF Air Conditioning System heats, it is characterized in that: its concrete steps are as follows:
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) by 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 maximum indoor set of refrigerant, the temperature T at indoor heat exchanger (2) middle part
0Minimum indoor set is the minimum indoor set of refrigerant;
The temperature sensor (3) of the outlet of c, the indoor heat exchanger (2) by 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) by 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
1maxDeduct T
1minDifference △ T;
D, whether judge △ T more than or equal to 5, if then the aperture of the interior organic electronic expansion valve (4) of the indoor set that refrigerant is minimum increases, the aperture of the interior organic electronic expansion valve (4) of the indoor set that refrigerant is maximum reduces simultaneously; If not, then do not regulate;
E, every certain interval of time, repeating step b ~ d is until shutdown.
2. prevent the control method of refrigerant bias current when VRF Air Conditioning System according to claim 1 heats, it is characterized in that: described a period of time of step a refers to 10 ~ 30 minutes.
3. prevent the control method of refrigerant bias current when VRF Air Conditioning System according to claim 2 heats, it is characterized in that: described a period of time of step a refers to 15 minutes.
4. prevent the control method of refrigerant bias current when VRF Air Conditioning System according to claim 1 heats, it is characterized in that: the described aperture of steps d reduces to refer to, multiply by any one number between 0.9 ~ 0.95 with original aperture; The described aperture of steps d increases and refers to, any one is several with original aperture multiply by between 1.05 ~ 1.1.
5. prevent the control method of refrigerant bias current when VRF Air Conditioning System according to claim 4 heats, it is characterized in that: the described aperture of steps d reduces to refer to, multiply by 0.95 with original aperture; The described aperture increase of steps d refers to, multiply by 1.05 with original aperture.
6. prevent the control method of refrigerant bias current when VRF Air Conditioning System according to claim 1 heats, it is characterized in that: described a period of time of step e refers to 10 ~ 30 seconds.
7. prevent the control method of refrigerant bias current when VRF Air Conditioning System according to claim 6 heats, it is characterized in that: described a period of time of step e refers to 15 seconds.
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| CN 201110255060 CN102278804B (en) | 2011-08-31 | 2011-08-31 | Control method for preventing bias flow of refrigerants during heating of multi-connected air conditioning unit |
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| WO2013118174A1 (en) * | 2012-02-09 | 2013-08-15 | 日立アプライアンス株式会社 | Air conditioner |
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| CN113531856A (en) * | 2020-04-22 | 2021-10-22 | 青岛海尔空调电子有限公司 | Multi-connected air conditioning system and refrigerant flow control method thereof |
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| CN115614910B (en) * | 2022-10-11 | 2024-08-20 | 珠海格力电器股份有限公司 | Refrigerant bias flow processing method and device and modularized air conditioning unit |
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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. |