CN103292422B - Direct-current variable-frequency multi-connection mechanism cold runs pressure of inspiration(Pi) control method - Google Patents
Direct-current variable-frequency multi-connection mechanism cold runs pressure of inspiration(Pi) control method Download PDFInfo
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- CN103292422B CN103292422B CN201310238601.1A CN201310238601A CN103292422B CN 103292422 B CN103292422 B CN 103292422B CN 201310238601 A CN201310238601 A CN 201310238601A CN 103292422 B CN103292422 B CN 103292422B
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Abstract
A kind of direct-current variable-frequency multi-connection mechanism cold runs pressure of inspiration(Pi) control method, regulate unit pressure of inspiration(Pi) particular by change DC frequency-changeable compressor operating frequency, its novel part can judge that whether current pressure of inspiration(Pi) is reasonable according to the operating condition of interior machine; If unreasonable, then carry out the change of target pressure of inspiration(Pi) force value.Described interior machine operating condition is entered to coil the temperature saturation temperature corresponding with current goal pressure of inspiration(Pi) by interior machine heat exchanger and is determined, accurately and reliably; By the present invention, accurately can control the pressure of inspiration(Pi) that direct-current variable-frequency multi-connection mechanism cold runs, ensure that the interior machine running status of freezing is better, pressure of inspiration(Pi) when making unit refrigerating operaton and indoor set operating condition adapt simultaneously, ensure the coupling that room inside/outside machine operates.
Description
Technical field
The present invention relates to multi-online air-conditioning system technical field, especially a kind of pressure of inspiration(Pi) control method, specifically a kind of direct-current variable-frequency multi-connection mechanism cold runs pressure of inspiration(Pi) control method.
Background technology
Pressure of inspiration(Pi) size during multi-connected machine refrigerating operaton, reflects the running status of interior machine, also has impact to the safe and reliable operation of compressor.Each air-conditioning producer all controls there is strict demand to pressure of inspiration(Pi) during refrigerating operaton.And for the determination of target pressure of inspiration(Pi), the running status of interior machine should be considered, need again the safe operation taking into account compressor.Current processing mode regulates compressor operating frequency mainly 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 ensure that compressor runs 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 whether current pressure of inspiration(Pi) matches with the operating condition of interior machine.
Summary of the invention
The object of the invention is cannot accurately control for existing suction pressure of compressor and the problem whether current pressure of inspiration(Pi) matches with the operating condition of interior machine can not be judged, invent a kind of direct-current variable-frequency multi-connection mechanism cold and run pressure of inspiration(Pi) control method, pressure of inspiration(Pi) when multi-connected machine freezes accurately can be controlled by the method, and judge its reasonability by the operating condition of interior machine, if unreasonable, change, until pressure of inspiration(Pi) and interior machine operating condition match.
Technical scheme of the present invention is:
A kind of direct-current variable-frequency multi-connection mechanism cold runs pressure of inspiration(Pi) control method, it is characterized in that first at multi-online indoor machine heat exchanger import set temperature sensor, for detecting indoor set heat exchanger inlet temperature; Pressure sensor is set on compressor return air pipe, for detecting unit pressure of inspiration(Pi) simultaneously; And carry out pressure of inspiration(Pi) control according to the following steps:
S1) first given pressure of inspiration(Pi) desired value Po, meanwhile, detects the actual pressure of inspiration(Pi) force value P1 of unit by the inspiratory pressure sensor be arranged on compressor return air pipe;
S2) regulate compressor frequency according to pressure differential △ P=P1-Po, until ︱ △ P ︱ <0.5Bar, think that P1 and Po is close, without the need to regulating; If △ is P >=0.5Bar, compressor operating frequency increases XHz; If △ is P≤-0.5Bar, compressor operating frequency reduces XHz;
S3) temperature sensor installed by indoor set heat exchanger import detects indoor set heat exchanger inlet temperature T
in, the target saturation temperature that goal pressure Po is corresponding is designated as To; According to machine heat exchanger inlet temperature mean value T in refrigerating operaton
in-avewith the difference of To, change target pressure value Po,
If 0≤△ is T=T
in-ave-To<0.5 DEG C, without the need to changing current goal pressure value P o;
If △ is T=T
in-ave-To>=0.5 DEG C, duration t
1min, then control objectives pressure value P o comparatively current goal force value 0.5Bar falls;
If △ is T=T
in-ave-To<0.5 DEG C, duration t
2min, then control objectives pressure value P o comparatively current goal force value add 0.5Bar; Above-mentioned duration t
1, t
2initial timing point be step S2 run complete;
S4) goal pressure Po excursion is Pm≤Po≤Pn, if Po >=Pn, then and Po=Pn; If Po≤Pm, then Po=Pm;
Step S4 returns S1, S2, carries out the loop cycle of S1-S2-S3-S4-S1, the every t of above-mentioned control after running
os detects and regulates once.
Described multi-connected machine adopts DC frequency-changeable compressor, its quantity >=1.
The invention has the beneficial effects as follows:
The present invention accurately can control the pressure of inspiration(Pi) that direct-current variable-frequency multi-connection mechanism cold runs, and ensure that the interior machine running status of freezing is better, pressure of inspiration(Pi) when making unit refrigerating operaton and indoor set operating condition adapt simultaneously, ensures the coupling that room inside/outside machine operates.
Accompanying drawing explanation
Fig. 1 is multi-connected machine structural representation of the present invention.
In figure: 1-DC frequency-changeable compressor, 2-oil eliminator, 3-cross valve, 4-outdoor unit 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.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention and detailed description of the invention thereof are described in further detail.
As shown in Figure 1.
Multi-connected machine of the present invention is formed by tube connector is connected by an off-premises station, multiple stage indoor set, internal-external machine.Off-premises station forms primarily of compressor 1, oil eliminator 2, cross valve 3, outdoor unit heat exchanger 4, off-premises station orifice union 5, liquid valve 6, air valve 9, gas-liquid separator 10; Compressor return air pipe is provided with pressure sensor 12, for detection system pressure of inspiration(Pi).Indoor set forms primarily of orifice union 7, indoor set heat exchanger 8; Indoor set heat exchanger import department is provided with temperature sensor 11.
The control method that direct-current variable-frequency multi-connection mechanism cold shown in Fig. 1 runs pressure of inspiration(Pi) is:
First given pressure of inspiration(Pi) desired value Po=9Bar, compressor original frequency is set to m
o, determine according to 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 is close, without the need to regulating; If △ is P >=0.5Bar, the concrete frequency number that compressor operating frequency increases 4Hz(to be increased at every turn or reduce can be selected voluntarily, and numeral less control difficulty is larger); If △ is P≤-0.5Bar, compressor operating frequency reduces 4Hz;
According to machine heat exchanger inlet temperature mean value T in refrigerating operaton
in-avewith the difference of target air-breathing saturation temperature To, change target pressure value Po.
If 0≤△ is T=T
in-ave-To<0.5 DEG C, without the need to changing current goal force value;
If △ is T=T
in-ave-To>=0.5 DEG C, the duration 30min(concrete time also can sets itself as required, is advisable to be no more than 40 minutes), then control objectives force value comparatively current goal force value 0.5Bar falls;
If △ is T=T
in-ave-To<0.5 DEG C, the duration 10min(concrete time also can sets itself as required, is advisable to be no more than 20 minutes), then control objectives force value comparatively current goal force value add 0.5Bar;
Goal pressure Po excursion is 6≤Po≤11Bar, if Po >=11Bar, then and Po=11Bar; If Po≤6Bar, then Po=6Bar;
After target pressure value adjustment terminates, interval remeasures unit actual motion pressure of inspiration(Pi) P1 for 40 seconds, and enters circulation.
Claims (2)
1. direct-current variable-frequency multi-connection mechanism cold runs a pressure of inspiration(Pi) control method, it is characterized in that first at multi-online indoor machine heat exchanger import set temperature sensor, for detecting indoor set heat exchanger inlet temperature; Pressure sensor is set on compressor return air pipe, for detecting unit pressure of inspiration(Pi) simultaneously; And carry out pressure of inspiration(Pi) control according to the following steps:
S1) first given pressure of inspiration(Pi) desired value Po, meanwhile, detects the actual pressure of inspiration(Pi) force value P1 of unit by the inspiratory pressure sensor be arranged on compressor return air pipe;
S2) regulate compressor frequency according to pressure differential △ P=P1-Po, until ︱ △ P ︱ <0.5Bar, think that P1 and Po is close, without the need to regulating; If △ is P >=0.5Bar, compressor operating frequency increases XHz; If △ is P≤-0.5Bar, compressor operating frequency reduces XHz;
S3) temperature sensor installed by indoor set heat exchanger import detects indoor set heat exchanger inlet temperature T
in, the target saturation temperature that goal pressure Po is corresponding is designated as To; According to machine heat exchanger inlet temperature mean value T in refrigerating operaton
in-avewith the difference of To, change target pressure value Po,
If 0≤△ is T=T
in-ave-To<0.5 DEG C, without the need to changing current goal pressure value P o;
If △ is T=T
in-ave-To>=0.5 DEG C, duration t
1min, then control objectives pressure value P o comparatively current goal force value 0.5Bar falls;
If △ is T=T
in-ave-To<0 DEG C, duration t
2min, then control objectives pressure value P o comparatively current goal force value add 0.5Bar; Above-mentioned duration t
1, t
2initial timing point be step S2 run complete;
S4) goal pressure Po excursion is Pm≤Po≤Pn, if Po >=Pn, then and Po=Pn; If Po≤Pm, then Po=Pm;
Step S4 returns S1, S2, carries out the loop cycle of S1-S2-S3-S4-S1, the every t of above-mentioned control after running
os detects and regulates once.
2. method according to claim 1, is characterized in that described multi-connected machine adopts DC frequency-changeable compressor, its quantity >=1.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| Publication Number | Publication Date |
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| CN103292422A CN103292422A (en) | 2013-09-11 |
| CN103292422B true CN103292422B (en) | 2015-12-23 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791941B (en) * | 2014-01-21 | 2017-11-10 | 广东美的暖通设备有限公司 | Air-conditioning system and its control method, the outdoor unit of air-conditioning system |
| CN104791945B (en) * | 2014-01-21 | 2017-10-31 | 广东美的暖通设备有限公司 | Air-conditioning system and its control method, the outdoor unit of air-conditioning system |
| 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 |
| 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 |
| 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 | The compensation method of air conditioner connecting pipe pressure loss 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 |
| 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 |
| 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 |
| CN113007861B (en) * | 2021-04-20 | 2022-07-12 | 宁波奥克斯电气股份有限公司 | Method and module for determining air suction side pressure, and control method, device and system |
| CN113074410B (en) * | 2021-04-28 | 2022-04-19 | 南京天加环境科技有限公司 | Refrigeration control method for long-piping multi-split air conditioner |
| CN113719964B (en) * | 2021-08-11 | 2022-06-28 | 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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| CN1366597A (en) * | 2000-04-03 | 2002-08-28 | 大金工业株式会社 | Air conditioner |
| CN1789846A (en) * | 2004-12-16 | 2006-06-21 | 松下电器产业株式会社 | Air conditioning device |
| CN101809372A (en) * | 2007-09-28 | 2010-08-18 | 大金工业株式会社 | Compressor operation control device and air conditioner using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012202590A (en) * | 2011-03-24 | 2012-10-22 | Hitachi Appliances Inc | Refrigerating device |
| ES2664520T3 (en) * | 2011-11-30 | 2018-04-19 | Samsung Electronics Co., Ltd. | Air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1366597A (en) * | 2000-04-03 | 2002-08-28 | 大金工业株式会社 | Air conditioner |
| CN1789846A (en) * | 2004-12-16 | 2006-06-21 | 松下电器产业株式会社 | Air conditioning device |
| CN101809372A (en) * | 2007-09-28 | 2010-08-18 | 大金工业株式会社 | Compressor operation control device and air conditioner using the same |
| CN102425841A (en) * | 2011-12-02 | 2012-04-25 | 深圳市森控科技有限公司 | Method for controlling machine room air conditioner based on variable frequency compressor |
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