CN102364258A - Protection method for preventing superheat during heating of multi-connection air conditioning unit - Google Patents
Protection method for preventing superheat during heating of multi-connection air conditioning unit Download PDFInfo
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Abstract
The invention discloses a protection method for preventing superheat during the heating of a multi-connection air conditioning unit, which comprises the following steps of: measuring the temperature Tm in the middle of an indoor heat exchanger (3) in each indoor machine; when Tm is equal to or greater than 56 DEG C and smaller than 60 DEG C, enforcing an outdoor fan to stop and enforcing an indoor fan to run under a high wind level as well as commanding a frequency conversion compressor (2) of each outdoor machine to run under a down frequency by a main controller; and when Tm reaches 60 DEG C, commanding the frequency conversion compressor (2) of each outdoor machine to directly reduce the frequency to a fixed value and to run under the fixed frequency, stopping a fixed frequency compressor (1) of one outdoor machine, and then stopping a running fixed frequency compressor (1) of one outdoor machine every 10 seconds by the main controller. Through the protection method, high voltage faults can be avoided, the system can run stably and the damage of the unit is avoided.
Description
Technical field
The present invention relates to VRF Air Conditioning System, specifically is that a kind of VRF Air Conditioning System prevents overheated guard method when heating.
Background technology
The VRF Air Conditioning System of prior art comprises a plurality of off-premises stations parallel with one another, 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.Each off-premises station comprises an invariable frequency compressor, frequency-changeable compressor, outdoor heat exchanger (evaporimeter) and a throttling arrangement; Two compressor parallels; The outlet of two compressors all is communicated with a refrigerant circulation house steward; Another root refrigerant circulation house steward is communicated with an end of throttling arrangement, and the other end of throttling arrangement is communicated with an end of outdoor heat exchanger, and the other end of outdoor heat exchanger is communicated with two inlets of the compressor of two parallel connections respectively; Each indoor set comprises electric expansion valve and indoor heat exchanger (condenser); One end of electric expansion valve is communicated with a refrigerant circulation house steward; The other end of electric expansion valve is communicated with an end of indoor heat exchanger, and the other end of indoor heat exchanger is communicated with another root refrigerant circulation house steward.The middle part of indoor heat exchanger is provided with temperature sensor, and each indoor heat exchanger is provided with indoor fan, and each outdoor heat exchanger is provided with outdoor fan.Above-mentioned temperature sensor, indoor fan, outdoor fan, frequency-changeable compressor and invariable frequency compressor all are electrically connected with the air-conditioning master controller.
In general the coil temperature of the indoor heat exchanger of the indoor set of VRF Air Conditioning System is high more good more, can reach heating effect fast like this, but anything is all limited; In case coil temperature is too high, promptly overheated, will cause harmful effect; Specifically, during the VRF Air Conditioning System operation, because some situation; Room Exposure to Sunlight angle like certain indoor set place is good, the Exposure to Sunlight time is long, indoor temperature is high, and when perhaps coming off duty, most of indoor sets of this unit are closed; Only the indoor set in the room of overtime work is opened, and makes cold-producing medium concentrate on situations such as this room, all can cause the indoor set coil temperature overheated; In case it is overheated the coil pipe of indoor set to have occurred, will makes that the gaseous coolant in this coil pipe can't liquefy in heat release, and then cause existing in the air-conditioning system a large amount of gaseous coolants; System's air pressure constantly increases like this, causes unit high voltage fault, fluctuation of service to occur, even can damage unit.
Summary of the invention
The technical problem that the present invention will solve is, prevents overheated guard method when providing a kind of and can avoid high voltage fault, making system is stable, avoid unit to damage VRF Air Conditioning System to heat.
Technical solution of the present invention is, prevents overheated guard method when providing a kind of VRF Air Conditioning System to heat, 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
m, temperature-measuring results is sent to the air-conditioning master controller;
C, judgement T
mWhether also continue 3 seconds more than or equal to 56 ℃, if otherwise directly get into step g; If then get into steps d;
D, judgement T
mWhether also continue 3 seconds, if not, then get into step e, if then get into step f more than or equal to 60 ℃;
E, master controller force outdoor fan to be shut down, and force the high wind shelves operation of indoor fan, and the frequency-changeable compressor frequency reducing operation of each off-premises station of master controller order simultaneously is until T
mLess than 55 ℃ and lasting 3 seconds, get into step g again;
F, master controller order the frequency-changeable compressor of each off-premises station directly to drop to fixed value operation frequently surely, and the invariable frequency compressor of an off-premises station is shut down, and whenever at a distance from 10 seconds one are still shut down at the invariable frequency compressor of the off-premises station that moves then, until T
mLess than 55 ℃ and lasting 3 seconds, get into step g again;
G, unit normally move, and return step b, until whole compressor emergency shutdown.
The principle of this control method is following.
Detect earlier the coil pipe middle part temperature of the indoor heat exchanger of each indoor set, if do not have overheated, i.e. T
mWhen not reaching 56 ℃, can not influence the liquefaction of coil pipe inner refrigerant, the air pressure in the whole unit is normal, so normal operation unit.
In case T
mReach 56 ℃ but when not reaching 60 ℃, when promptly overheated, the difficult liquefaction of coil pipe inner refrigerant; Air pressure in the whole unit also begins to increase, and at this moment, outdoor fan is shut down; Reduce the heat in the outdoor heat exchanger, can reduce the liquid refrigerants evaporation, reduce system's internal gas pressure; And, can at utmost strengthen the indoor set heat exchange with the high wind shelves operation of indoor fan, and promote the cooling medium liquefaction in the indoor heat exchanger, reduce system's internal gas pressure; The frequency-changeable compressor of each off-premises station of frequency reducing operation reduces the speed of service of cold-producing medium in whole system, also can reduce the coil temperature of indoor heat exchanger, alleviates overheated, reduction air pressure; After above-mentioned three kinds of regulative modes adjusting, coil pipe middle part temperature T
mReach system's internal gas pressure and begin to descend, work as T
mWhen also continuing 3 seconds less than 55 ℃, when promptly no longer overheated, system begins normal operation.
And work as T
mWhen reaching 60 ℃, system is seriously overheated, and air pressure increases severely; Must regulate the most fast, at this moment, directly the frequency-changeable compressor with whole off-premises stations is depressured to a lower fixed frequency; And close the invariable frequency compressor of an off-premises station, after 10 seconds, close still in the invariable frequency compressor of other off-premises station of operation; After 10 seconds, continue to close still in the invariable frequency compressor of other off-premises station that moves, until T
mWhen also continuing 3 seconds less than 55 ℃, when promptly no longer overheated, normal operational system.
Adopt above method, VRF Air Conditioning System of the present invention prevents overheated guard method compared with prior art when heating, and has the following advantages:
This method can be regulated according to overheated degree targetedly, thereby avoids preventing that unit from damaging because of high-voltage operation because the overheated a series of high voltage faults that cause of indoor heat exchanger coil pipe of indoor set make system stable.
As improvement, described a period of time of step a is meant 10 ~ 30 minutes, and promptly compressor operating begins to detect and regulate overheating conditions after 10 ~ 30 minutes; Because this VRF Air Conditioning System after operation a period of time, just begins to occur superheating phenomenon, through evidence; It is more accurate that 10 ~ 30 minutes these time periods began to regulate, and too early regulates, and it is overheated can not occur; Need not regulate, the words of regulating too late are overheated to have caused harmful effect.
As improving, described a period of time of step a is meant 15 minutes again, and promptly compressor operating begins to regulate superheating phenomenon after 15 minutes; Prove through repetition test; This time point was the most accurate in 15 minutes, too early regulated, and it is overheated can not occur; Need not regulate, the words of regulating too late are overheated to have caused harmful effect.
As also improving, the described frequency reducing operation of step e is meant that frequency-changeable compressor is with the speed frequency reducing operation of 5 ~ 10Hz/s; Through evidence, frequency-changeable compressor is with the speed frequency reducing of 5 ~ 10Hz/s, and regulating effect is more satisfactory, neither can cause harmful effect excessively slowly because of governing speed, also can not make system response too drastic because of governing speed is too fast, wastes the energy.
As further improvement, frequency-changeable compressor is with the speed frequency reducing operation of 5Hz/s; Prove that through repetition test frequency-changeable compressor is with the speed frequency reducing operation of 5Hz/s; Regulating effect is the most desirable, neither can cause harmful effect excessively slowly because of governing speed, also can not make system response too drastic because of governing speed is too fast, wastes the energy.
As further improvement, the described frequency-changeable compressor of step f directly drops to fixed value operation frequently surely, and this fixed value is 30 ~ 36Hz; Promptly directly frequency-changeable compressor is dropped to 30 ~ 36Hz, better to overheated regulating effect, this draws through overtesting; If frequency is too high, then strength of adjustment is not enough, if frequency is too low; Then react too drastic, regulation and control excessively.
As also further improving, the described frequency-changeable compressor of step f directly drops to fixed value operation frequently surely, and this fixed value is 30Hz; Promptly directly frequency-changeable compressor is dropped to 30Hz, best to overheated regulating effect, this draws through overtesting; If frequency is too high, then strength of adjustment is not enough, if frequency is too low; Then react too drastic, regulation and control excessively.
Description of drawings
Fig. 1 is the structural representation that the embodiment of the present invention VRF Air Conditioning System prevents the device of overheated guard method when heating.
Shown in the figure 1, invariable frequency compressor, 2, frequency-changeable compressor, 3, indoor heat exchanger, 4, temperature sensor.
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 overheated guard method when heating, and its concrete steps are following:
A, with the compressor of off-premises station start operation a period of time; Described a period of time is meant 10 ~ 30 minutes, preferred 15 minutes.
The temperature sensor 4 at b, indoor heat exchanger 3 middle parts through each indoor set is measured the temperature T at indoor heat exchanger 3 middle parts of each indoor set
m, temperature-measuring results is sent to the air-conditioning master controller.
C, judgement T
mWhether also continue 3 seconds more than or equal to 56 ℃, if otherwise directly get into step g; If then get into steps d.
D, judgement T
mWhether also continue 3 seconds, if not, then get into step e, if then get into step f more than or equal to 60 ℃.
E, master controller force outdoor fan to be shut down, and force the high wind shelves operation of indoor fan, and the frequency-changeable compressor 2 frequency reducings operation of each off-premises station of master controller order simultaneously is until T
mLess than 55 ℃ and lasting 3 seconds, get into step g again; Described frequency reducing operation is meant that frequency-changeable compressor 2 is with the speed frequency reducing operation of 5 ~ 10Hz/s, and preferably the speed frequency reducing with 5Hz/s moves.
F, master controller order the frequency-changeable compressor 2 of each off-premises station directly to drop to fixed value operation frequently surely, and the invariable frequency compressor 1 of an off-premises station is shut down, and whenever at a distance from 10 seconds one are still shut down at the invariable frequency compressor 1 of the off-premises station that moves then, until T
mLess than 55 ℃ and lasting 3 seconds, get into step g again; Described frequency-changeable compressor 2 directly drops to fixed value operation frequently surely, and this fixed value is 30 ~ 36Hz, preferred 30Hz.
G, unit normally move, and return step b, until whole compressor emergency shutdown.
Claims (7)
1. prevent overheated guard method when a VRF Air Conditioning System heats, it is characterized in that: its concrete steps are following:
A, with the compressor of off-premises station start operation a period of time;
The temperature sensor (4) at b, the middle part of the indoor heat exchanger (3) through each indoor set is measured the temperature T at indoor heat exchanger (3) middle part of each indoor set
m, temperature-measuring results is sent to the air-conditioning master controller;
C, judgement T
mWhether also continue 3 seconds more than or equal to 56 ℃, if otherwise directly get into step g; If then get into steps d;
D, judgement T
mWhether also continue 3 seconds, if not, then get into step e, if then get into step f more than or equal to 60 ℃;
E, master controller force outdoor fan to be shut down, and force the high wind shelves operation of indoor fan, and frequency-changeable compressor (2) the frequency reducing operation of each off-premises station of master controller order simultaneously is until T
mLess than 55 ℃ and lasting 3 seconds, get into step g again;
The frequency-changeable compressor (2) of f, each off-premises station of master controller order directly drops to fixed value operation frequently surely; And the invariable frequency compressor (1) of an off-premises station is shut down; Whenever at a distance from 10 seconds one is still shut down at the invariable frequency compressor (1) of the off-premises station that moves then, until T
mLess than 55 ℃ and lasting 3 seconds, get into step g again;
G, unit normally move, and return step b, until whole compressor emergency shutdown.
2. VRF Air Conditioning System according to claim 1 prevents overheated guard method when heating, and 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 overheated guard method when heating, and 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 overheated guard method when heating, and it is characterized in that: the described frequency reducing operation of step e is meant that frequency-changeable compressor (2) is with the speed frequency reducing operation of 5 ~ 10Hz/s.
5. VRF Air Conditioning System according to claim 4 prevents overheated guard method when heating, and it is characterized in that: the described frequency reducing operation of step e is meant that frequency-changeable compressor (2) is with the speed frequency reducing operation of 5Hz/s.
6. VRF Air Conditioning System according to claim 1 prevents overheated guard method when heating, and it is characterized in that: the described frequency-changeable compressor of step f (2) directly drops to fixed value operation frequently surely, and this fixed value is 30 ~ 36Hz.
7. VRF Air Conditioning System according to claim 6 prevents overheated guard method when heating, and it is characterized in that: the described frequency-changeable compressor of step f (2) directly drops to fixed value operation frequently surely, and this fixed value is 30Hz.
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| CN 201110283873 CN102364258B (en) | 2011-09-23 | 2011-09-23 | Protection method for preventing superheat during heating of multi-connection air conditioning unit |
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| CN 201110283873 CN102364258B (en) | 2011-09-23 | 2011-09-23 | Protection method for preventing superheat during heating of multi-connection air conditioning unit |
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| CN102538149A (en) * | 2012-03-07 | 2012-07-04 | 广东志高空调有限公司 | Overheat protection control method and overheat protection control device for air conditioner |
| CN104879892A (en) * | 2015-05-12 | 2015-09-02 | 广东美的暖通设备有限公司 | Control method and control system for high-temperature protection of air conditioner internal unit |
| CN105042770A (en) * | 2015-07-02 | 2015-11-11 | 珠海格力电器股份有限公司 | Control method and device for air conditioner heating startup |
| CN105091238A (en) * | 2015-08-26 | 2015-11-25 | 珠海格力电器股份有限公司 | Method and device for controlling heating and high temperature prevention of air conditioner system and air conditioner |
| CN106500241A (en) * | 2016-10-10 | 2017-03-15 | 芜湖美智空调设备有限公司 | The halt control method of air-conditioner and device and air-conditioner |
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| CN111023264A (en) * | 2019-12-25 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Air conditioner and control method thereof |
| CN111578414A (en) * | 2020-05-25 | 2020-08-25 | 广东美的制冷设备有限公司 | Radiation air conditioner and radiation surface drying control method and device |
| CN111578414B (en) * | 2020-05-25 | 2021-12-28 | 广东美的制冷设备有限公司 | Radiation air conditioner and radiation surface drying control method and device |
| 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 |
| CN112944585A (en) * | 2021-02-20 | 2021-06-11 | 格力电器（合肥）有限公司 | Air conditioning equipment control method and device, air conditioning equipment and storage medium |
| CN112944585B (en) * | 2021-02-20 | 2023-02-28 | 格力电器（合肥）有限公司 | Air conditioning equipment control method and device, air conditioning equipment and storage medium |
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