CN103216909B - Control method of outdoor fan during heating of variable-frequency multi-connection type air conditioning unit - Google Patents

Control method of outdoor fan during heating of variable-frequency multi-connection type air conditioning unit Download PDF

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Publication number
CN103216909B
CN103216909B CN201310109323.XA CN201310109323A CN103216909B CN 103216909 B CN103216909 B CN 103216909B CN 201310109323 A CN201310109323 A CN 201310109323A CN 103216909 B CN103216909 B CN 103216909B
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outdoor fan
temperature
mean value
condensation temperature
wind shelves
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CN103216909A (en
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郑坚江
侯丽峰
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Abstract

The invention discloses a control method of an outdoor fan during heating of a variable-frequency multi-connection type air conditioning unit. The control method comprises the following specific steps of a, measuring outdoor environment temperature; b, judging whether the outdoor environment temperature is less than or equal to 18 DEG C or not, if so, starting an outdoor fan (1) in high wind level, continuously running for 30 seconds and entering into step c; and if not, starting the outdoor fan (1) in a medium wind level, continuously running for 30 seconds and then directly entering into step d; c, regulating the wind level in which the outdoor fan (1) runs for once every 30 seconds according to the average value of the condensation temperature; and d, regulating the wind level in which the outdoor fan (1) runs for once every 30 seconds according to the average value of the condensation temperature. According to the control method disclosed by the invention, the frequency of the outdoor fan can run reasonably.

Description

The control method of outdoor fan when variable-frequency multi-connection type air-conditioner set heats
Technical field
The present invention relates to VRF Air Conditioning System, is specifically the control method of a kind of variable-frequency multi-connection type air-conditioner set outdoor fan when heating.
Background technology
The VRF Air Conditioning System of prior art comprises off-premises station, multiple indoor set parallel with one another and connects two refrigerant circulation house stewards of each indoor set and off-premises station.Off-premises station is communicated with the multiple indoor sets after parallel connection by two refrigerant circulation house stewards.
Each off-premises station comprises compressor, oil eliminator, four-way change-over valve, reservoir, throttling arrangement, outdoor heat exchanger (being evaporimeter during heating mode) and gas-liquid separator.Compressor outlet is communicated with one end of oil eliminator, the other end of oil eliminator is communicated with the first valve port of four-way change-over valve, one of circulating in house steward is communicated with for four-way change-over valve second valve port and two refrigerants, and another root refrigerant circulation house steward in two refrigerant circulation house stewards is communicated with one end of reservoir, the other end of reservoir is communicated with one end of throttling arrangement, the other end of throttling arrangement is communicated with one end of outdoor heat exchanger, the other end of outdoor heat exchanger is communicated with the 3rd valve port of four-way change-over valve, 4th valve port of four-way change-over valve is communicated with one end of gas-liquid separator, the other end of gas-liquid separator is communicated with suction port of compressor.
Each indoor set comprises interior organic electronic expansion valve and indoor heat exchanger (being condenser during heating mode), one end of indoor heat exchanger is communicated with one end of interior organic electronic expansion valve, one that the other end and two refrigerants of interior organic electronic expansion valve circulate in house steward is communicated with, and the house steward that circulates is communicated with for the other end and two refrigerants another root refrigerant circulated in house steward of indoor heat exchanger.
During heating mode, the first valve port of four-way change-over valve is communicated with the second valve port, and the 3rd valve port is communicated with the 4th valve port, and namely refrigerant is along compressor, indoor heat exchanger, outdoor heat exchanger, the circulation of this route of compressor.
The middle part of the heat exchange coil of indoor heat exchanger is provided with the first temperature inductor, and this temperature inductor can measure the coil pipe middle portion temperature of indoor heat exchanger, i.e. condensation temperature.Off-premises station is also provided with the second temperature inductor detecting outdoor environment temperature.The compressor outlet of off-premises station is provided with the 3rd temperature inductor detecting delivery temperature.Three above-mentioned temperature inductors are all electrically connected with air-conditioning master controller.Off-premises station is also provided with the blower fan of upper and lower two heat exchange, and two blower fans are also electrically connected with the master controller of air-conditioning.Two blower fans, under air-conditioning main controller controls, can run with five wind shelves, i.e. high wind shelves, apoplexy shelves, low wind shelves, ultralow wind shelves and blowing-out shelves.High wind shelves refer to that two all high wind shelves of blower fan run, and apoplexy shelves refer to that two equal apoplexy shelves of blower fan run, and low wind shelves refer to that two all low wind shelves of blower fan run, and ultralow wind shelves refer to that the low wind shelves of blower fan run and another fan parking, and blowing-out shelves refer to that two blower fans are all shut down.
The running frequency of frequency-changeable compressor constantly changes along with the height of outdoor environment temperature, and the heat exchange area of outdoor heat exchanger is constant, the wind shelves that outdoor fan runs are depended on the heat exchange amount of external environment, if the compressor operating frequency of the wind shelves of fan operation and air-conditioning and outdoor environment temperature do not mate, as too high in wind shelves, then noise is large, fan energy consumption is large, and hypertonia in the middle part of the coil pipe of indoor set, condensation temperature is high, easily there is high voltage fault, can not normally heat, and wind shelves are too low, then in the middle part of coil pipe, pressure is little, condensation temperature is low, cannot normally heat equally.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of control method that the frequency of outdoor fan can be made to run outdoor fan when rational variable-frequency multi-connection type air-conditioner set heats.
Technical solution of the present invention is, the control method of outdoor fan when providing a kind of variable-frequency multi-connection type air-conditioner set to heat, and its concrete steps are as follows:
A, by off-premises station second temperature inductor measure outdoor environment temperature, measurement result is sent to the master controller of air-conditioning;
B, whether judge outdoor environment temperature≤18 DEG C, if so, then start outdoor fan with high wind shelves, and continuous service 30s, then enter step c; If not, then start outdoor fan with apoplexy shelves, and continuous service 30s, more directly enter steps d;
C, every 30s, the condensation temperature of every platform indoor set is measured with the first temperature inductor of every platform indoor set of start, and temperature-measuring results is sent to the master controller of air-conditioning, and calculate the mean value of the condensation temperature of whole indoor sets of this moment starting shooting, again according to the mean value of condensation temperature this moment, regulate the wind shelves of an outdoor fan operation; The adjustment criteria of this step is: mean value≤45 DEG C of condensation temperature this moment, then improve wind shelves and run outdoor fan, the mean value > 45 DEG C of condensation temperature this moment and < 51 DEG C, former wind shelves are then kept to run outdoor fan, mean value >=51 DEG C of condensation temperature this moment, then reduce wind shelves and run outdoor fan, in this step, the minimum wind shelves that outdoor fan runs are ultralow wind shelves, and outdoor fan does not allow blowing-out shelves;
D, every 30s, the condensation temperature of every platform indoor set is measured with the first temperature inductor of every platform indoor set of start, and temperature-measuring results is sent to the master controller of air-conditioning, and calculate the mean value of the condensation temperature of whole indoor sets of this moment starting shooting, again according to the mean value of condensation temperature this moment, regulates the wind shelves of an outdoor fan operation; The adjustment criteria of this step is: mean value≤37 DEG C of condensation temperature this moment, then improve wind shelves and run outdoor fan, the mean value > 37 DEG C of condensation temperature this moment and < 48 DEG C, former wind shelves are then kept to run outdoor fan, mean value >=48 of condensation temperature this moment DEG C and < 56 DEG C, then reduce wind shelves and run outdoor fan;
While the gear process of carrying out every 30s adjustment outdoor fan once, the mean value whether >=56 DEG C of the master controller of air-conditioning also Real-Time Monitoring condensation temperature, once find mean value >=56 DEG C of condensation temperature this moment, then aperiodic pressure blowing-out machine, until the mean value of condensation temperature drops to 45 DEG C, aperiodic lasting low wind shelves run outdoor fan again, last until the mean value of condensation temperature restarts to rise, then recover 30s normal regulating once;
While the gear process of carrying out every 30s adjustment outdoor fan once, the master controller of air-conditioning is the delivery temperature whether >=105 DEG C of the compressor of off-premises station measured of Real-Time Monitoring the 3rd temperature inductor also, once find delivery temperature >=105 DEG C this moment, then aperiodic pressure blowing-out machine, until delivery temperature drops to 92 DEG C, aperiodic lasting low wind shelves run outdoor fan again, last until delivery temperature restarts to rise, then recover 30s normal regulating once.
This controlling party ratio juris is: during VRF Air Conditioning System heating operation, the size of pressure in the middle part of the coil pipe that condensation temperature can reflect the indoor heat exchanger of indoor set, if strengthen the wind shelves that outdoor fan runs, then heat exchange amount increases, the amount of refrigerant evaporation increases, in the middle part of the coil pipe of condensation temperature and indoor heat exchanger, pressure can improve, and the pressure at expulsion of compressor outlet and delivery temperature also can improve; And reducing the wind shelves of outdoor fan operation, then heat exchange amount reduces, and the amount of refrigerant evaporation reduces, and the pressure in the middle part of the coil pipe of indoor heat exchanger and condensation temperature can reduce, and the pressure at expulsion of compressor outlet and delivery temperature also can reduce; And outdoor environment temperature is higher, the heat transfer effect of air-conditioning is better, and the wind shelves that outdoor fan runs require lower; Therefore can according to condensation temperature, outdoor environment temperature, delivery temperature, comprehensive reasonable regulates the operation wind shelves of outdoor fan.
Adopt above method, when variable-frequency multi-connection type air-conditioner set of the present invention heats, the control method of outdoor fan compared with prior art, has the following advantages:
By this control method, can ensure that the wind shelves of fan operation all mate at any time with the compressor operating frequency of air-conditioning and outdoor environment temperature, avoid that the too high noise caused of wind shelves is large, fan energy consumption be large, in the middle part of coil pipe pressure and Compressor Discharge Pressure too high, there is the drawbacks such as high voltage fault, avoid again that pressure in the middle part of the too low coil pipe caused of wind shelves is little, situation that the compressor exhaust temperature of indoor set condensation temperature and off-premises station is too low, ensure normally to freeze.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of variable-frequency multi-connection type air-conditioner set of the present invention control method of outdoor fan when heating.
Shown in figure 1, outdoor fan, the 2, first temperature inductor, 3, compressor, the 4, the 3rd temperature inductor, 5, indoor heat exchanger.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, the control method of outdoor fan when variable-frequency multi-connection type air-conditioner set of the present invention heats, its concrete steps are as follows.
A, by off-premises station second temperature inductor measure outdoor environment temperature, measurement result is sent to the master controller of air-conditioning.
B, whether judge outdoor environment temperature≤18 DEG C, if so, then start outdoor fan 1 with high wind shelves, and continuous service 30s, then enter step c; If not, then start outdoor fan 1 with apoplexy shelves, and continuous service 30s, more directly enter steps d.
C, every 30s, coil pipe middle portion temperature and the condensation temperature of the indoor heat exchanger 5 of every platform indoor set is measured with the first temperature inductor 2 of every platform indoor set of start, and temperature-measuring results is sent to the master controller of air-conditioning, and calculate the mean value of the condensation temperature of whole indoor sets of this moment starting shooting, again according to the mean value of condensation temperature this moment, regulate the wind shelves of outdoor fan 1 operation.Briefly, be exactly after outdoor fan 1 starts, start the operation wind shelves that every 30s regulates an outdoor fan 1.The adjustment criteria of this step is: mean value≤45 DEG C of condensation temperature this moment, then improve wind shelves and run outdoor fan 1; The mean value > 45 DEG C of condensation temperature this moment and < 51 DEG C, then keep former wind shelves to run outdoor fan 1; Mean value >=51 DEG C of condensation temperature this moment, then reduce wind shelves and run outdoor fan 1.In this step, the minimum wind shelves that outdoor fan 1 runs are ultralow wind shelves, outdoor fan 1 does not allow blowing-out shelves, specifically, the lowest gear that outdoor fan 1 runs is exactly ultralow wind shelves, even outdoor fan 1 just to run and condensation temperature mean value this moment meets the condition of reduction wind shelves at ultralow wind shelves this moment, the mean value as condensation temperature is this moment 54 DEG C, but still needs to keep ultralow wind shelves to run.
D, every 30s, the condensation temperature of every platform indoor set is measured with the first temperature inductor 2 of every platform indoor set of start, and temperature-measuring results is sent to the master controller of air-conditioning, and calculate the mean value of the condensation temperature of whole indoor sets of this moment starting shooting, again according to the mean value of condensation temperature this moment, regulates the wind shelves of outdoor fan 1 operation.The adjustment criteria of this step is: mean value≤37 DEG C of condensation temperature this moment, then improve wind shelves and run outdoor fan 1, the mean value > 37 DEG C of condensation temperature this moment and < 48 DEG C, former wind shelves are then kept to run outdoor fan 1, mean value >=48 of condensation temperature this moment DEG C and < 56 DEG C, then reduce wind shelves and run outdoor fan 1.Every 30s adjustment process once, belongs to normal regulating process above, once there are following two kinds of situations, will exit normal regulating process.
The first needs the situation exiting normal regulating process to be, while the gear process of carrying out every 30s adjustment outdoor fan 1 once, the mean value whether >=56 DEG C of the master controller of air-conditioning also Real-Time Monitoring condensation temperature, once find mean value >=56 DEG C of condensation temperature this moment, then aperiodic pressure blowing-out machine, that is, the outdoor fan 1 that makes of in unlimited time continues blowing-out shelves, until the mean value of condensation temperature drops to 45 DEG C, aperiodic lasting low wind shelves run outdoor fan 1 again, it is last until the mean value of condensation temperature restarts to rise, recover 30s normal regulating once again, namely every 30s normal regulating process once is again returned to.
The second needs the situation exiting normal regulating process to be, while the gear process of carrying out every 30s adjustment outdoor fan 1 once, the master controller of air-conditioning is the delivery temperature whether >=105 DEG C of the compressor 3 of off-premises station measured of Real-Time Monitoring the 3rd temperature inductor 4 also, once find delivery temperature >=105 DEG C this moment, then aperiodic pressure blowing-out machine, until delivery temperature drops to 92 DEG C, aperiodic lasting low wind shelves run outdoor fan 1 again, it is last until delivery temperature restarts to rise, recover 30s normal regulating once again, namely every 30s normal regulating process once is again returned to.

Claims (1)

1. a control method for outdoor fan when variable-frequency multi-connection type air-conditioner set heats, is characterized in that: its concrete steps are as follows:
A, by off-premises station second temperature inductor measure outdoor environment temperature, measurement result is sent to the master controller of air-conditioning;
B, whether judge outdoor environment temperature≤18 DEG C, if so, then start outdoor fan (1) with high wind shelves, and continuous service 30s, then enter step c; If not, then start outdoor fan (1) with apoplexy shelves, and continuous service 30s, more directly enter steps d;
C, every 30s, the condensation temperature of every platform indoor set is measured with first temperature inductor (2) of every platform indoor set of start, and temperature-measuring results is sent to the master controller of air-conditioning, and calculate the mean value of the condensation temperature of whole indoor sets of this moment starting shooting, again according to the mean value of condensation temperature this moment, regulate the wind shelves that outdoor fan (1) is run; The adjustment criteria of this step is: mean value≤45 DEG C of condensation temperature this moment, then improve wind shelves and run outdoor fan (1), the mean value > 45 DEG C of condensation temperature this moment and < 51 DEG C, former wind shelves are then kept to run outdoor fan (1), mean value >=51 DEG C of condensation temperature this moment, then reduce wind shelves and run outdoor fan (1), in this step, the minimum wind shelves that outdoor fan (1) runs are ultralow wind shelves, and outdoor fan (1) does not allow blowing-out shelves;
D, every 30s, the condensation temperature of every platform indoor set is measured with first temperature inductor (2) of every platform indoor set of start, and temperature-measuring results is sent to the master controller of air-conditioning, and calculate the mean value of the condensation temperature of whole indoor sets of this moment starting shooting, again according to the mean value of condensation temperature this moment, regulate the wind shelves that outdoor fan (1) is run; The adjustment criteria of this step is: mean value≤37 DEG C of condensation temperature this moment, then improve wind shelves and run outdoor fan (1), the mean value > 37 DEG C of condensation temperature this moment and < 48 DEG C, former wind shelves are then kept to run outdoor fan (1), mean value >=48 of condensation temperature this moment DEG C and < 56 DEG C, then reduce wind shelves and run outdoor fan (1);
While the gear process of carrying out every 30s adjustment outdoor fan (1) once, the mean value whether >=56 DEG C of the master controller of air-conditioning also Real-Time Monitoring condensation temperature, once find mean value >=56 DEG C of condensation temperature this moment, then aperiodic pressure blowing-out machine, until the mean value of condensation temperature drops to 45 DEG C, aperiodic lasting low wind shelves run outdoor fan (1) again, last until the mean value of condensation temperature restarts to rise, then recover 30s normal regulating once;
While the gear process of carrying out every 30s adjustment outdoor fan (1) once, the master controller of air-conditioning is the delivery temperature whether >=105 DEG C of the compressor (3) of off-premises station measured of Real-Time Monitoring the 3rd temperature inductor (4) also, once find delivery temperature >=105 DEG C this moment, then aperiodic pressure blowing-out machine, until delivery temperature drops to 92 DEG C, aperiodic lasting low wind shelves run outdoor fan (1) again, last until delivery temperature restarts to rise, then recover 30s normal regulating once.
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Address after: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166

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