CN103292422A - Method for controlling refrigerating running suction pressure of direct current frequency conversion multi-line unit - Google Patents
Method for controlling refrigerating running suction pressure of direct current frequency conversion multi-line unit Download PDFInfo
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- CN103292422A CN103292422A CN2013102386011A CN201310238601A CN103292422A CN 103292422 A CN103292422 A CN 103292422A CN 2013102386011 A CN2013102386011 A CN 2013102386011A CN 201310238601 A CN201310238601 A CN 201310238601A CN 103292422 A CN103292422 A CN 103292422A
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Abstract
Provided is a method for controlling the refrigerating running suction pressure of a direct current frequency conversion multi-line unit. The operating frequency of a direct current frequency inverter compressor is changed to adjust the suction pressure of the unit. The method is characterized in that the current suction pressure is judged to be reasonable or not according to the operating state of an internal machine, and if not reasonable, a target suction pressure value is changed. The operating state of the internal machine is determined through the temperature of a feeding tray of a heat exchanger of the internal machine and the corresponding saturation temperature of current target suction pressure, and accuracy and reliability are achieved. Through the method, the refrigerating running suction pressure of the direct current frequency conversion multi-line unit can be controlled precisely, meanwhile, the good operating state of the refrigerating internal machine is guaranteed, the refrigerating running suction pressure of the unit is made to be adaptive to the operating state of an indoor unit, and matching of operating of the indoor unit and operating of an outdoor unit is guaranteed.
Description
Technical field
The present invention relates to the multi-online air-conditioning system technical field, especially a kind of pressure of inspiration(Pi) control method, the specifically multi-joint machine-processed cold operation pressure of inspiration(Pi) control method of a kind of DC frequency-changing.
Background technology
Pressure of inspiration(Pi) size during multi-joint machine-processed cold operation has reflected the running status of interior machine, and is also influential to the safe and reliable operation of compressor.The pressure of inspiration(Pi) control of each air-conditioning producer during all to refrigerating operaton has strict demand.And determine that for the target pressure of inspiration(Pi) running status of machine in should considering need be taken into account the safe operation of compressor again.Present processing mode is many regulates the compressor operating frequency with the return air temperature of interior machine and the difference of wind pushing temperature, and then regulates pressure of inspiration(Pi).This control methods can guarantee that compressor moves in safe range, but its regulation and control result is unpredictable, makes pressure of inspiration(Pi) have randomness, is unfavorable for accurate control, and can not judge that whether current pressure of inspiration(Pi) is complementary with the operating condition of interior machine.
Summary of the invention
The objective of the invention is accurately to control and can not judge the problem whether current pressure of inspiration(Pi) is complementary with the operating condition of interior machine at existing compressor air suction pressure, invent the multi-joint machine-processed cold operation pressure of inspiration(Pi) control method of a kind of DC frequency-changing, can accurately control the pressure of inspiration(Pi) of multi-joint mechanism when cold by this method, and judge its reasonability by the operating condition of interior machine, then change as if unreasonable, be complementary until pressure of inspiration(Pi) and interior machine operating condition.
Technical scheme of the present invention is:
The multi-joint machine-processed cold operation pressure of inspiration(Pi) control method of a kind of DC frequency-changing is characterized in that at first in the import of multi-online indoor machine heat exchanger temperature sensor being set, for detection of indoor set heat exchanger inlet temperature; Simultaneously at the compressor return air pipe pressure sensor is set, for detection of the unit pressure of inspiration(Pi); And carry out pressure of inspiration(Pi) according to the following steps and control:
S1) at first given pressure of inspiration(Pi) desired value Po simultaneously, detects the actual pressure of inspiration(Pi) value of unit P1 by the inspiratory pressure sensor that is installed on the compressor return air pipe;
S2) regulate compressor frequency according to pressure differential △ P=P1-Po, until ︱ △ P ︱＜0.5Bar, think that P1 and Po approach, need not to regulate; If △ P 〉=0.5Bar, the compressor operating frequency increases XHz; If △ P≤-0.5Bar, the compressor operating frequency reduces XHz;
S3) by machine heat exchanger inlet temperature T in the temperature sensor sensing chamber of indoor set heat exchanger import installation
In, the target saturation temperature of goal pressure Po correspondence is designated as To; According to the interior machine heat exchanger inlet temperature mean value T in the refrigerating operaton
In-aveWith the difference of To, change target pressure value Po,
If 0≤△ T=T
In-ave-To＜0.5 ℃ need not to change current goal pressure value P o;
If △ T=T
In-ave-To 〉=0.5 ℃, duration t
1Min then controls target pressure value Po and falls 0.5Bar than the current goal force value;
If △ T=T
In-ave-To＜0.5 ℃, duration t
2Min then controls target pressure value Po and adds 0.5Bar than the current goal force value; Above-mentioned duration t
1, t
2Initial timing point finish for step S2 operation;
S4) goal pressure Po excursion is Pm≤Po≤Pn, if Po 〉=Pn, then Po=Pn; If Po≤Pm, then Po=Pm;
After step S4 operation finishes, return S1, S2, carry out the loop cycle of S1-S2-S3-S4-S1, the every t of above-mentioned control
oS detects and regulates once.
Described multi-joint machine adopts DC frequency-changeable compressor, its quantity 〉=1.
The invention has the beneficial effects as follows:
The present invention can accurately control the pressure of inspiration(Pi) of the multi-joint machine-processed cold operation of DC frequency-changing, guarantees that simultaneously the interior machine running status of refrigeration is preferable, and the pressure of inspiration(Pi) when making the unit refrigerating operaton and indoor set operating condition adapt, and guarantee the coupling of chamber inside/outside machine running.
Description of drawings
Fig. 1 is multi-joint machine structural representation of the present invention.
Among the figure: 1-DC frequency-changeable 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-indoor set heat exchanger inlet temperature sensor, 12-inspiratory pressure sensor.
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 linked to each other by tube connector and is formed by an off-premises station, many indoor sets, inside and outside machines.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 orifice union 5, liquid valve 6, air valve 9, gas-liquid separator 10; The compressor return air pipe is provided with pressure sensor 12, for detection of system's pressure of inspiration(Pi).Indoor set mainly is made up of orifice union 7, indoor set heat exchanger 8; Import department is provided with temperature sensor 11 at the indoor set heat exchanger.
The control method of the multi-joint machine-processed cold operation pressure of inspiration(Pi) of DC frequency-changing shown in Figure 1 is:
At first given pressure of inspiration(Pi) desired value Po=9Bar, the compressor original frequency is made as m
o, decide according to the indoor set workload demand.Unit actual motion pressure of inspiration(Pi) is P1; Regulate compressor frequency according to pressure differential △ P=P1-Po, until △ P＜0.5Bar, think that P1 and Po approach, need not to regulate; If △ P 〉=0.5Bar, the compressor operating frequency increases the each concrete frequency number that increases or reduce of 4Hz(can be selected voluntarily, and the more little control difficulty of numeral is more big); If △ P≤-0.5Bar, the compressor operating frequency reduces 4Hz;
According to the interior machine heat exchanger inlet temperature mean value T in the refrigerating operaton
In-aveWith the difference of the air-breathing saturation temperature To of target, change target pressure value Po.
If 0≤△ T=T
In-ave-To＜0.5 ℃ need not to change the current goal force value;
If △ T=T
In-ave-To 〉=0.5 ℃, the concrete time of duration 30min(also can set up on their own as required, is advisable to be no more than 40 minutes), then control target pressure value and fall 0.5Bar than the current goal force value;
If △ T=T
In-ave-To＜0.5 ℃, the concrete time of duration 10min(also can set up on their own as required, is advisable to be no more than 20 minutes), then control target pressure value and add 0.5Bar than the current goal force value;
Goal pressure Po excursion is 6≤Po≤11Bar, if Po 〉=11Bar, then Po=11 Bar; If Po≤6Bar, then Po=6Bar;
After the target pressure value adjustment finishes, remeasured unit actual motion pressure of inspiration(Pi) P1 in 40 seconds at interval, and enter circulation.
Claims (2)
1. the multi-joint machine-processed cold operation pressure of inspiration(Pi) control method of DC frequency-changing is characterized in that at first in the import of multi-online indoor machine heat exchanger temperature sensor being set, for detection of indoor set heat exchanger inlet temperature; Simultaneously at the compressor return air pipe pressure sensor is set, for detection of the unit pressure of inspiration(Pi); And carry out pressure of inspiration(Pi) according to the following steps and control:
S1) at first given pressure of inspiration(Pi) desired value Po simultaneously, detects the actual pressure of inspiration(Pi) value of unit P1 by the inspiratory pressure sensor that is installed on the compressor return air pipe;
S2) regulate compressor frequency according to pressure differential △ P=P1-Po, until ︱ △ P ︱＜0.5Bar, think that P1 and Po approach, need not to regulate; If △ P 〉=0.5Bar, the compressor operating frequency increases XHz; If △ P≤-0.5Bar, the compressor operating frequency reduces XHz;
S3) by machine heat exchanger inlet temperature T in the temperature sensor sensing chamber of indoor set heat exchanger import installation
In, the target saturation temperature of goal pressure Po correspondence is designated as To; According to the interior machine heat exchanger inlet temperature mean value T in the refrigerating operaton
In-aveWith the difference of To, change target pressure value Po,
If 0≤△ T=T
In-ave-To＜0.5 ℃ need not to change current goal pressure value P o;
If △ T=T
In-ave-To 〉=0.5 ℃, duration t
1Min then controls target pressure value Po and falls 0.5Bar than the current goal force value;
If △ T=T
In-ave-To＜0.5 ℃, duration t
2Min then controls target pressure value Po and adds 0.5Bar than the current goal force value; Above-mentioned duration t
1, t
2Initial timing point finish for step S2 operation;
S4) goal pressure Po excursion is Pm≤Po≤Pn, if Po 〉=Pn, then Po=Pn; If Po≤Pm, then Po=Pm;
After step S4 operation finishes, return S1, S2, carry out the loop cycle of S1-S2-S3-S4-S1, the every t of above-mentioned control
oS detects and regulates once.
2. method according to claim 1 is characterized in that described multi-joint machine adopts DC frequency-changeable compressor, its quantity 〉=1.
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| CN201310238601.1A CN103292422B (en) | 2013-06-17 | 2013-06-17 | Direct-current variable-frequency multi-connection mechanism cold runs pressure of inspiration(Pi) control method |
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| CN201310238601.1A CN103292422B (en) | 2013-06-17 | 2013-06-17 | Direct-current variable-frequency multi-connection mechanism cold runs pressure of inspiration(Pi) control method |
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| CN103292422B CN103292422B (en) | 2015-12-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791945A (en) * | 2014-01-21 | 2015-07-22 | 广东美的暖通设备有限公司 | Air conditioner system, control method of air conditioner system and outdoor unit of air conditioner system |
| CN104791941A (en) * | 2014-01-21 | 2015-07-22 | 广东美的暖通设备有限公司 | Air conditioning system and control method thereof and outdoor unit of air conditioning system |
| CN105299845A (en) * | 2015-11-20 | 2016-02-03 | 广东美的制冷设备有限公司 | Virtual running parameter detecting method and device of air conditioner system |
| CN106765550A (en) * | 2016-11-28 | 2017-05-31 | 广东美的暖通设备有限公司 | The control method of multiple on-line system and its compressor |
| CN108131805A (en) * | 2017-10-31 | 2018-06-08 | 宁波奥克斯电气股份有限公司 | A kind of multi-connected machine self_adaptive adjusting method and device |
| CN110360704A (en) * | 2018-04-09 | 2019-10-22 | 珠海格力电器股份有限公司 | air conditioner connecting pipe pressure loss compensation method and device |
| 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 |
| CN112664455A (en) * | 2019-10-15 | 2021-04-16 | 广东芬尼克兹节能设备有限公司 | Lubrication adjusting method and device for compressor, electronic equipment and storage medium |
| CN113007861A (en) * | 2021-04-20 | 2021-06-22 | 宁波奥克斯电气股份有限公司 | Suction side pressure determination method, module, control method, device and system |
| CN113074410A (en) * | 2021-04-28 | 2021-07-06 | 南京天加环境科技有限公司 | Refrigeration control method for long-piping multi-split air conditioner |
| CN113719964A (en) * | 2021-08-11 | 2021-11-30 | 宁波奥克斯电气股份有限公司 | Air conditioner control method and device and air conditioner |
| CN114440414A (en) * | 2020-11-04 | 2022-05-06 | 广东美的制冷设备有限公司 | Multi-split air conditioner, control method thereof and computer storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105299845B (en) * | 2015-11-20 | 2018-03-13 | 广东美的制冷设备有限公司 | Air-conditioning system operational factor virtual detection method and device |
| CN105299845A (en) * | 2015-11-20 | 2016-02-03 | 广东美的制冷设备有限公司 | Virtual running parameter detecting method and device of air conditioner system |
| CN106765550A (en) * | 2016-11-28 | 2017-05-31 | 广东美的暖通设备有限公司 | The control method of multiple on-line system and its compressor |
| CN108131805A (en) * | 2017-10-31 | 2018-06-08 | 宁波奥克斯电气股份有限公司 | A kind of multi-connected machine self_adaptive adjusting method and device |
| CN108131805B (en) * | 2017-10-31 | 2020-07-10 | 宁波奥克斯电气股份有限公司 | Multi-split self-adaptive adjustment control method and device |
| CN110360704A (en) * | 2018-04-09 | 2019-10-22 | 珠海格力电器股份有限公司 | air conditioner connecting pipe pressure loss compensation method and device |
| CN112664455B (en) * | 2019-10-15 | 2023-02-21 | 广东芬尼克兹节能设备有限公司 | Lubrication adjusting method and device for compressor, electronic equipment and storage medium |
| CN112664455A (en) * | 2019-10-15 | 2021-04-16 | 广东芬尼克兹节能设备有限公司 | Lubrication adjusting method and device for compressor, electronic equipment and storage medium |
| WO2021072954A1 (en) * | 2019-10-15 | 2021-04-22 | 广东芬尼克兹节能设备有限公司 | Compressor lubrication adjusting method and device, electronic equipment, and storage medium |
| 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 |
| 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 |
| CN111578472B (en) * | 2020-05-29 | 2022-03-22 | 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 |
| CN114440414A (en) * | 2020-11-04 | 2022-05-06 | 广东美的制冷设备有限公司 | Multi-split air conditioner, control method thereof and computer storage medium |
| CN114440414B (en) * | 2020-11-04 | 2023-05-26 | 广东美的制冷设备有限公司 | Multi-split air conditioner, control method thereof and computer storage medium |
| CN113007861A (en) * | 2021-04-20 | 2021-06-22 | 宁波奥克斯电气股份有限公司 | Suction side pressure determination method, module, control method, device and system |
| CN113074410A (en) * | 2021-04-28 | 2021-07-06 | 南京天加环境科技有限公司 | Refrigeration control method for long-piping multi-split air conditioner |
| CN113719964A (en) * | 2021-08-11 | 2021-11-30 | 宁波奥克斯电气股份有限公司 | Air conditioner control method and device and air conditioner |
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