CN102353117A - System protection method for sudden indoor load change of variable refrigerant volume (VRV) air conditioner - Google Patents
System protection method for sudden indoor load change of variable refrigerant volume (VRV) air conditioner Download PDFInfo
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- CN102353117A CN102353117A CN2011102219185A CN201110221918A CN102353117A CN 102353117 A CN102353117 A CN 102353117A CN 2011102219185 A CN2011102219185 A CN 2011102219185A CN 201110221918 A CN201110221918 A CN 201110221918A CN 102353117 A CN102353117 A CN 102353117A
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Abstract
The invention provides a system protection method for sudden indoor load change of a variable refrigerant volume (VRV) air conditioner. The system protection method is characterized in that: different measures are taken according to different conditions, namely when the reduction range of an indoor unit load is more than 20 percent in a calculating cycle, an indoor unit which receives a shutdown command is shut down, and the opening of a corresponding indoor electronic expansion valve is zero step; an indoor unit which does not receive a shutdown command is continuously operated, and the opening of a corresponding indoor electronic expansion valve is between 350 and 450 steps; when the reduction range of the indoor unit load is more than 20 percent in the calculating cycle, the opening of an electronic expansion valve of an indoor unit which is just started up is initial basic opening, and the initial basic opening is automatically regulated immediately according to superheat degree or supercooling degree of a heat exchanger of the indoor unit; and when the indoor unit load is increased suddenly to make the increase range of the target operating frequency of a variable frequency compressor is more than 20 Hz, and when the current operating frequency is lower than 50 Hz or higher than 50 Hz and lower than 70 Hz, the operating frequency is increased to 50 Hz or 70 Hz respectively for 30 s and then is increased to the target frequency.
Description
Technical field
The present invention relates to air-conditioning technical field, relate in particular to the system protection method of a kind of VRV air-conditioning when indoor load suddenlys change.
Background technology
The VRV air-conditioning, promptly the DC frequency-changing multi-gang air-conditioner is to drag one or many indoor sets by an off-premises station, during indoor set load coupling, the indoor set load is 100%～130% of an off-premises station load.The VRV air-conditioning is when normal operation, and the circulating mass of refrigerant in the pipe-line system is consistent with the compressor air-discharging amount, and system operational parameters also is in normal range (NR) like delivery temperature, suction temperature, pressure at expulsion, back pressure etc.
In the daily life; If the people is for closing a large amount of indoor sets; Perhaps a large amount of indoor sets have a power failure suddenly; Only remaining a small amount of indoor set operation can cause the indoor set load to reduce significantly suddenly, still; Early stage compressor load output was whenever regulated once at a distance from 40 seconds; In this time interval, compressor load output will occur much larger than the indoor set load so, the discharge capacity of compressor is greater than the circulating mass of refrigerant in the pipe-line system at this moment.Under refrigeration mode, it is excessive that the indoor set throttling will appear in the VRV air-conditioning system, crosses low fault and low pressure takes place; Under heating mode, it is excessive that the indoor set high pressure will appear in the VRV air-conditioning system, and high voltage fault takes place.
Another kind of situation, if owing in the short time, have a large amount of indoor sets to open, can cause the indoor set load to rise significantly suddenly, at this moment, compressor load is exported in order to adapt to the indoor set load variations, must rise to high frequency from low frequency.But, because compressor raising frequency speed is higher than the speed of indoor set electronic expansion valve regulation, the compressor air-discharging amount will appear greater than circulating mass of refrigerant in the pipeline.Under refrigeration mode, it is excessive that the indoor set throttling will appear in the VRV air-conditioning system, crosses low fault and low pressure takes place; Under heating mode, it is excessive that the indoor set high pressure will appear in the VRV air-conditioning system, and high voltage fault takes place.
Summary of the invention
System protection method when the technical problem that the present invention will solve provides the internal loading sudden change of a kind of VRV air conditioning chamber is avoided the generation of many on-line systems of DC frequency-changing low voltage failure or high voltage fault, improves the reliability and the operational effect of operation of air conditioner.
The technical solution of the present invention is to provide an air-conditioned indoor load mutation VRV system protection methods for the following different situations take different measures: When the indoor unit load is reduced in the calculation cycle larger than 20%, the shutdown command is received indoor machine shutdown, the corresponding indoor electronic expansion valve opening degree is zero step, the shutdown command is not received indoor unit continues to run, the corresponding indoor electronic expansion valve opening degree is always open to the steps 350 to 450, the indoor fan on high winds, e expansion valve opening degree of 350 to step 450 in duration to 50 seconds to 70 seconds, the electronic expansion valve opening degree returns to automatic control state; when the indoor unit in the calculation cycle, the load increase rate of greater than 20%, the new boot indoor unit The opening degree of the electronic expansion valve opening degree of an initial base, the system according to the indoor unit heat exchanger superheat or subcooling automatic adjustment.The indoor set electronic expansion valve opening of having started shooting is regulated according to the degree of supercooling or the degree of superheat automatically; When the rising rapidly of indoor set load, when causing frequency-changeable compressor object run frequency ascensional range to be higher than 20Hz, when current running frequency is lower than 50Hz; Target frequency is higher than 50Hz; When being lower than 70Hz, after running frequency was raised to 50Hz operation 30s earlier, raising frequency was to target frequency again; When current running frequency is higher than 50Hz, and be lower than 70Hz, when target frequency was higher than 70Hz, after running frequency was raised to 70Hz operation 30s earlier, raising frequency was to target frequency again.When current running frequency is lower than 50Hz, when target frequency was higher than 70Hz, running frequency was raised to 50Hz operation 30s earlier, and raising frequency is to 70Hz operation 30s again, and raising frequency is to target frequency at last.Simultaneously, the unloading magnetic valve between the high and low pressure side is opened, after running frequency is raised to target frequency, and closed electromagnetic valve.
As preferably, said indoor set load computing cycle is 40s ~ 60s.
As preferably, the reduction amplitude is greater than 20% the time in computing cycle when the indoor set load, and the electronic expansion valve opening of indoor set that does not receive shutdown command is after 350～450 steps continued 50 seconds～70 seconds, and electronic expansion valve opening is returned to automatic adjustment state.
As preferably, the reduction amplitude is greater than 20% the time in computing cycle when the indoor set load, and the indoor set electronic expansion valve opening of having started shooting is regulated according to the degree of supercooling or the degree of superheat automatically.
As preferably, described initial basic aperture was 150～200 steps.
As preferably, when frequency-changeable compressor object run frequency ascensional range was higher than 20Hz, the unloading magnetic valve between the high and low pressure side was opened, after running frequency is raised to target frequency, and closed electromagnetic valve.
As preferably, the raising frequency speed of described compressor operating frequency is 1H
Z/ S.
The present invention compared with the prior art; Have following remarkable advantage and beneficial effect: to indoor set load in computing cycle the reduction amplitude greater than 20% situation; The measure that the present invention taked; In computing cycle; Can increase the indoor set load; Increase the circulating mass of refrigerant in the pipe-line system, thereby reduce because high voltage fault and low pressure that the discharge capacity of compressor causes greater than the circulating mass of refrigerant in the pipe-line system are crossed low fault.
To indoor set load in computing cycle the rising amplitude greater than 20% situation; The measure that the present invention taked; In computing cycle; Can reduce the indoor set load of new start; Reduce the circulating mass of refrigerant in the pipe-line system, thereby reduce because low voltage failure and low pressure that the discharge capacity of compressor produces less than the circulating mass of refrigerant in the pipe-line system are crossed low fault.
To situation about rising rapidly when the indoor set load; Cause frequency-changeable compressor object run frequency ascensional range to be higher than the situation of 20Hz; The measure that the present invention taked; In computing cycle; Can reduce frequency-changeable compressor raising frequency speed, thereby reduce high voltage fault and the low voltage failure that produces because compressor raising frequency speed is higher than the speed of indoor set electronic expansion valve regulation.
When the indoor set sudden load change, the present invention avoids the generation of many on-line systems of DC frequency-changing low voltage failure or high voltage fault through regulating the raising frequency mode of corresponding electric expansion valve and compressor operating frequency, improves the reliability and the operational effect of operation of air conditioner.
The specific embodiment
Be described in detail technical scheme of the present invention for better illustrating below in conjunction with the instance specific embodiments of the invention.
Example one: in computing cycle, when indoor set operation number from original 10, when being reduced to 7, being the reduction amplitude is 30%, the indoor set that receives shutdown command is shut down, corresponding indoor electronic expansion valve opening was zero step.The indoor set that does not receive shutdown command continues operation, and corresponding indoor electronic expansion valve opening reached for 350 steps without exception, and the indoor set blower fan is opened high wind.Electronic expansion valve opening is after 350 duration in step were 60 seconds, and electronic expansion valve opening returns to automatic adjustment state.
Example two: in computing cycle; When indoor set operation number from original 10; When being increased to 14, being the rising amplitude is that 40% new indoor set electronic expansion valve opening of starting shooting is initial basic aperture, and this moment, system regulated according to the degree of superheat or the degree of supercooling of indoor set heat exchanger automatically.The indoor set electronic expansion valve opening of having started shooting is regulated according to the degree of supercooling or the degree of superheat automatically.
Example three: when the rising rapidly of indoor set load, causing frequency-changeable compressor object run frequency ascensional range is 25Hz, and current running frequency is 40Hz, and when target frequency was 65Hz, after running frequency was raised to 50Hz operation 30s earlier, raising frequency was to 65Hz again.Simultaneously, the unloading magnetic valve between the high and low pressure side is opened, after running frequency is raised to 65Hz, and closed electromagnetic valve.
Example four: when the rising rapidly of indoor set load, causing frequency-changeable compressor object run frequency ascensional range is 25Hz, and current running frequency is 55Hz, and when target frequency was 80Hz, after running frequency was raised to 70Hz operation 30s earlier, raising frequency was to 80Hz again.Simultaneously, the unloading magnetic valve between the high and low pressure side is opened, after running frequency is raised to 80Hz, and closed electromagnetic valve.
Example five: when the rising rapidly of indoor set load, causing frequency-changeable compressor object run frequency ascensional range is 35Hz, and current running frequency is 45Hz; When target frequency is 80Hz; Running frequency is raised to 50Hz operation 30s earlier, and raising frequency is to 70Hz operation 30s again, and last raising frequency is to 80Hz.Simultaneously, the unloading magnetic valve between the high and low pressure side is opened, after running frequency is raised to 80Hz, and closed electromagnetic valve.
In the above-described embodiments; Preferred forms of the present invention is described; Obviously; Under inventive concept of the present invention; Still can make a lot of variations; As described when indoor set load in computing cycle the reduction amplitude greater than 20% the time; Also can take when indoor set load in computing cycle the reduction amplitude greater than 18% the time or the indoor set load reduction amplitude in indoor set load computing cycle that can bear of other VRV air-conditionings; And for example said electronic expansion valve opening is after 350 duration in step were 60 seconds; Electronic expansion valve opening is returned to automatic adjustment state; Also can take any value of electronic expansion valve opening in 350～450 step scopes; After duration is any value in 50 seconds～70 seconds scopes; Electronic expansion valve opening is returned to automatic adjustment state; And for example when current running frequency is lower than 50Hz; After running frequency is raised to 50Hz operation 30s earlier; Raising frequency is to target frequency again; Also can take when current running frequency is lower than 55Hz; After running frequency was raised to 55Hz operation 25s earlier, raising frequency was to target frequency again.Should illustrate that any change of under inventive concept of the present invention, being made all will fall in protection scope of the present invention.
Claims (7)
1. the system protection method when a VRV air conditioning chamber internal loading suddenlys change; It is characterized in that; Take different measure to following different situations: when indoor set load in computing cycle the reduction amplitude greater than 20% the time; The indoor set that receives shutdown command is shut down, and corresponding indoor electronic expansion valve opening was zero step; The indoor set that does not receive shutdown command continues operation, and corresponding indoor electronic expansion valve opening reached for 350～450 steps without exception, and the indoor set blower fan is opened high wind; The rising amplitude is greater than 20% the time in computing cycle when indoor set load, and the electronic expansion valve opening of the indoor set of new start be initial basic aperture, and system regulates according to the degree of superheat or the degree of supercooling of indoor set heat exchanger automatically at this moment; When the rising rapidly of indoor set load, when causing frequency-changeable compressor object run frequency ascensional range to be higher than 20Hz, when current running frequency is lower than 50Hz; Target frequency is higher than 50Hz; When being lower than 70Hz, running frequency elder generation raising frequency is behind 50Hz operation 30s, and raising frequency is to target frequency again; When current running frequency is higher than 50Hz, and be lower than 70Hz, when target frequency was higher than 70Hz, after running frequency elder generation raising frequency moved 30s to 70Hz, raising frequency was to target frequency again; When current running frequency is lower than 50Hz, when target frequency was higher than 70Hz, running frequency elder generation raising frequency was to 50Hz operation 30s, and raising frequency moves 30s to 70Hz again, and raising frequency is to target frequency at last.
2. according to claim 1, it is characterized in that: said indoor set load computing cycle is 40s ~ 60s.
3. according to claim 1; It is characterized in that: when indoor set load in computing cycle the reduction amplitude greater than 20% the time; The electronic expansion valve opening of indoor set that does not receive shutdown command is after 350～450 steps continued 50 seconds～70 seconds, and electronic expansion valve opening is returned to automatic adjustment state.
4. according to claim 1, it is characterized in that: the reduction amplitude is greater than 20% the time in computing cycle when indoor set load, and the indoor set electronic expansion valve opening of having started shooting is regulated according to the degree of supercooling or the degree of superheat automatically.
5. according to claim 1, it is characterized in that: described initial basic aperture was 150～200 steps.
6. according to claim 1, it is characterized in that: when frequency-changeable compressor object run frequency ascensional range was higher than 20Hz, the unloading magnetic valve between the high and low pressure side was opened, after running frequency is raised to target frequency, and closed electromagnetic valve.
7. according to claim 1, it is characterized in that: the raising frequency speed of described compressor operating frequency is 1H
Z/ S.
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| CN 201110221918 CN102353117B (en) | 2011-08-04 | 2011-08-04 | System protection method for sudden indoor load change of variable refrigerant volume (VRV) air conditioner |
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| CN 201110221918 CN102353117B (en) | 2011-08-04 | 2011-08-04 | System protection method for sudden indoor load change of variable refrigerant volume (VRV) air conditioner |
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| CN102353117B CN102353117B (en) | 2013-06-05 |
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Cited By (12)
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| CN103486689A (en) * | 2013-09-11 | 2014-01-01 | 广东美的制冷设备有限公司 | Air conditioner control method and device |
| CN104729022A (en) * | 2015-04-09 | 2015-06-24 | 宁波奥克斯电气有限公司 | Variable frequency air conditioner unit starting frequency raising control method |
| CN105157292A (en) * | 2015-07-06 | 2015-12-16 | 重庆美的通用制冷设备有限公司 | Control method and device for electronic expansion valves of air cooling screw unit |
| CN105571079A (en) * | 2016-01-28 | 2016-05-11 | 广东美的暖通设备有限公司 | Control method and control system during coping with indoor unit capacity change by multi-connected outdoor unit |
| CN105649988A (en) * | 2014-11-13 | 2016-06-08 | 同方人工环境有限公司 | Determination method for load percentage of stepless screw compressor |
| CN109084421A (en) * | 2018-08-03 | 2018-12-25 | 广东美的暖通设备有限公司 | Control method, control device and the air conditioner of air conditioner |
| CN110608514A (en) * | 2019-09-20 | 2019-12-24 | 珠海格力电器股份有限公司 | Control method of multi-connected air conditioning system and free distribution multi-connected air conditioning system |
| CN111765609A (en) * | 2020-06-30 | 2020-10-13 | 海信（山东）空调有限公司 | Multi-split air conditioner control method, multi-split air conditioner and storage medium |
| CN111895630A (en) * | 2020-07-31 | 2020-11-06 | 广东Tcl智能暖通设备有限公司 | Air conditioner operation control method, air conditioner and storage medium |
| CN113739350A (en) * | 2021-09-23 | 2021-12-03 | 宁波奥克斯电气股份有限公司 | Low-temperature heating frequency conversion control method and device, storage medium and air conditioner |
| CN113915112A (en) * | 2021-09-10 | 2022-01-11 | 珠海格力电器股份有限公司 | Unit variable frequency compressor control method and device and condensing unit |
| CN115289732A (en) * | 2022-07-04 | 2022-11-04 | 广东纽恩泰新能源科技发展有限公司 | Heat pump system control method and device, electronic equipment and storage medium |
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Cited By (21)
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| CN103486689B (en) * | 2013-09-11 | 2016-03-02 | 广东美的制冷设备有限公司 | The control method of air-conditioner and device |
| CN103486689A (en) * | 2013-09-11 | 2014-01-01 | 广东美的制冷设备有限公司 | Air conditioner control method and device |
| CN105649988A (en) * | 2014-11-13 | 2016-06-08 | 同方人工环境有限公司 | Determination method for load percentage of stepless screw compressor |
| CN104729022A (en) * | 2015-04-09 | 2015-06-24 | 宁波奥克斯电气有限公司 | Variable frequency air conditioner unit starting frequency raising control method |
| CN104729022B (en) * | 2015-04-09 | 2017-09-12 | 宁波奥克斯电气股份有限公司 | Raising frequency control method when convertible frequency air-conditioner unit starts |
| CN105157292A (en) * | 2015-07-06 | 2015-12-16 | 重庆美的通用制冷设备有限公司 | Control method and device for electronic expansion valves of air cooling screw unit |
| CN105157292B (en) * | 2015-07-06 | 2017-08-29 | 重庆美的通用制冷设备有限公司 | The control method for electronic expansion valve and device of air-cooled screw unit |
| CN105571079B (en) * | 2016-01-28 | 2019-01-25 | 广东美的暖通设备有限公司 | A kind of multi-joint outer machine cope in machine volume change when control method and control system |
| CN105571079A (en) * | 2016-01-28 | 2016-05-11 | 广东美的暖通设备有限公司 | Control method and control system during coping with indoor unit capacity change by multi-connected outdoor unit |
| US11168913B2 (en) | 2018-08-03 | 2021-11-09 | Hefei Midea Heating & Ventilating Equipment Co., Ltd. | Control method and control device of air conditioner and air conditioner |
| CN109084421B (en) * | 2018-08-03 | 2020-08-18 | 广东美的暖通设备有限公司 | Control method and control device of air conditioner and air conditioner |
| CN109084421A (en) * | 2018-08-03 | 2018-12-25 | 广东美的暖通设备有限公司 | Control method, control device and the air conditioner of air conditioner |
| CN110608514A (en) * | 2019-09-20 | 2019-12-24 | 珠海格力电器股份有限公司 | Control method of multi-connected air conditioning system and free distribution multi-connected air conditioning system |
| CN111765609A (en) * | 2020-06-30 | 2020-10-13 | 海信（山东）空调有限公司 | Multi-split air conditioner control method, multi-split air conditioner and storage medium |
| CN111765609B (en) * | 2020-06-30 | 2021-10-22 | 海信（山东）空调有限公司 | Multi-split air conditioner control method, multi-split air conditioner and storage medium |
| CN111895630A (en) * | 2020-07-31 | 2020-11-06 | 广东Tcl智能暖通设备有限公司 | Air conditioner operation control method, air conditioner and storage medium |
| CN113915112A (en) * | 2021-09-10 | 2022-01-11 | 珠海格力电器股份有限公司 | Unit variable frequency compressor control method and device and condensing unit |
| CN113915112B (en) * | 2021-09-10 | 2022-08-12 | 珠海格力电器股份有限公司 | Unit variable frequency compressor control method and device and condensing unit |
| CN113739350A (en) * | 2021-09-23 | 2021-12-03 | 宁波奥克斯电气股份有限公司 | Low-temperature heating frequency conversion control method and device, storage medium and air conditioner |
| CN115289732A (en) * | 2022-07-04 | 2022-11-04 | 广东纽恩泰新能源科技发展有限公司 | Heat pump system control method and device, electronic equipment and storage medium |
| CN115289732B (en) * | 2022-07-04 | 2023-11-21 | 广东纽恩泰新能源科技发展有限公司 | Heat pump system control method and device, electronic equipment and storage medium |
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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. |