CN110319541B - Unloading adjustment control method of large-displacement variable-frequency multi-split system - Google Patents
Unloading adjustment control method of large-displacement variable-frequency multi-split system Download PDFInfo
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- CN110319541B CN110319541B CN201910578064.2A CN201910578064A CN110319541B CN 110319541 B CN110319541 B CN 110319541B CN 201910578064 A CN201910578064 A CN 201910578064A CN 110319541 B CN110319541 B CN 110319541B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention discloses an unloading regulation control method of a large-displacement variable-frequency multi-split system, wherein the multi-split system comprises an outdoor unit and a plurality of indoor units, each indoor unit comprises an indoor heat exchanger and an electronic expansion valve, the outdoor unit comprises an outdoor heat exchanger, a compressor and an unloading electromagnetic valve, and the unloading electromagnetic valve is used for communicating the air outlet side and the air return side of the compressor; the control method comprises the following steps: the multi-split system enters a working mode, and the start-stop state of each indoor heat exchanger is detected and judged; if the working mode is a refrigeration mode, acquiring outlet temperature parameters of the indoor heat exchanger in an opening state, calculating an outlet temperature average value, and determining the opening degree of the unloading electromagnetic valve according to the outlet temperature average value; and if the working mode is the heating mode, acquiring the middle temperature parameter of the indoor heat exchanger in the opening state, calculating the average value of the middle temperature, and determining the opening degree of the unloading electromagnetic valve according to the average value of the middle temperature.
Description
Technical Field
The invention relates to the technical field of multi-split air conditioners, in particular to an unloading adjustment control method of a large-displacement variable-frequency multi-split air conditioner system.
Background
In the existing multi-split air-conditioning system, the indoor unit is small in model and small in required refrigerating capacity, the output capacity of a high-displacement variable frequency compressor is far greater than that of the indoor unit even if the variable frequency compressor runs at the lowest operable frequency (for example, the lowest operation frequency of 20-P variable frequency compressors is 10Hz, and the compressor capacity of the variable frequency compressor exceeds 3000W), so that the compressor capacity is large, the capacity demand of the indoor unit is small, namely the phenomenon of 'large horse-drawn trolley', and under the condition that the output of the outdoor unit compressor is large, the evaporator of the indoor unit is small and the caliber of an electronic expansion valve matched with the evaporator of the indoor unit is small, the high-pressure of the multi-split air-conditioning system is frequently caused to cause frequent start and stop of the;
meanwhile, in a refrigeration mode, the heat exchanger of the indoor unit cannot completely evaporate liquid refrigerant, so that the evaporation temperature of the refrigerant is low, the heat exchanger of the indoor unit is frosted seriously and can be frozen, the indoor unit cannot be continuously refrigerated due to anti-freezing protection of the indoor unit, the change of the indoor environment temperature is large, and the comfort of a user is affected;
and under the heating mode, the indoor set heat exchanger can not the complete condensation, will lead to the refrigerant condensation temperature very high, and indoor chance appears preventing high temperature protection, appears preventing because the indoor set can not continuously heat after the high temperature protection, leads to the ambient temperature of indoor side to change greatly, finally influences the travelling comfort that the user used.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an unloading regulation control method of a large-displacement variable-frequency multi-split air-conditioning system with high energy efficiency value.
In order to achieve the purpose, the scheme provided by the invention is as follows: the multiple on-line system comprises an outdoor unit and a plurality of indoor units, wherein each indoor unit comprises an indoor heat exchanger and an electronic expansion valve, the outdoor unit comprises an outdoor heat exchanger, a compressor and an unloading electromagnetic valve, and the unloading electromagnetic valve is used for communicating the air outlet side and the air return side of the compressor; the control method comprises the following steps: the multi-split system enters a working mode, and the start-stop state of each indoor heat exchanger is detected and judged; if the working mode is a refrigeration mode, acquiring outlet temperature parameters of the indoor heat exchanger in an opening state, calculating an outlet temperature average value, and determining the opening degree of the unloading electromagnetic valve according to the outlet temperature average value; and if the working mode is the heating mode, acquiring the middle temperature parameter of the indoor heat exchanger in the opening state, calculating the average value of the middle temperature, and determining the opening degree of the unloading electromagnetic valve according to the average value of the middle temperature.
Further, if the operating mode is the cooling mode, acquiring an outlet temperature parameter of the indoor heat exchanger in an open state and calculating an outlet temperature average value, and determining the opening degree of the unloading solenoid valve according to the outlet temperature average value includes: the determining the opening degree of the unloading solenoid valve according to the average value of the outlet temperature comprises: when the average value of the outlet temperatures is greater than or equal to a first maximum preset temperature value, determining the opening degree of the unloading electromagnetic valve to be fully closed, when the average value of the outlet temperatures is less than or equal to a first minimum preset temperature value, determining the opening degree of the unloading electromagnetic valve to be fully opened, and when the average value of the outlet temperatures is less than the first maximum preset temperature value and greater than the first minimum preset temperature value, determining the opening degree of the unloading electromagnetic valve according to the negative correlation relationship between the preset average value of the outlet temperatures and the opening degree of the unloading electromagnetic valve.
Further, the first maximum preset temperature value is 8 ℃, and the first minimum preset temperature value is 2 ℃.
Further, if the operating mode is a heating mode, acquiring a middle temperature parameter of the indoor heat exchanger in an open state and calculating a middle temperature average value, and determining the opening degree of the unloading electromagnetic valve according to the middle temperature average value includes: when the average value of the middle temperature is greater than or equal to a second maximum preset temperature value, the opening degree of the unloading electromagnetic valve is determined to be fully opened, when the average value of the middle temperature is less than or equal to a second minimum preset temperature value, the opening degree of the unloading electromagnetic valve is determined to be fully closed, and when the average value of the middle temperature is less than the second maximum preset temperature value and greater than the second minimum preset temperature value, the opening degree of the unloading electromagnetic valve is determined according to a positive correlation relation between the preset average value of the middle temperature and the opening degree of the unloading electromagnetic valve.
Further, the second maximum preset temperature value is 55 ℃, and the second minimum preset temperature value is 44 ℃.
Further, the control method further includes: if only one indoor heat exchanger in an opening state is used, acquiring an indoor environment temperature parameter corresponding to the indoor heat exchanger, and when the working mode is a refrigeration mode, determining the opening degree of the unloading electromagnetic valve together according to the average value of the outlet temperature of the indoor heat exchanger and the indoor environment temperature parameter; and when the working mode is a heating mode, determining the opening degree of the unloading electromagnetic valve according to the average value of the middle temperature of the indoor heat exchanger and the indoor environment temperature parameter.
Further, when the working mode is a cooling mode, the determining the opening degree of the unloading electromagnetic valve according to the average value of the outlet temperature of the indoor heat exchanger and the indoor environment temperature parameter comprises: subtracting a preset indoor target temperature from an indoor environment temperature parameter to obtain a cooling difference value, determining the opening degree of the unloading electromagnetic valve to be fully closed when the cooling difference value is greater than or equal to a first maximum temperature difference value, determining the opening degree of the unloading electromagnetic valve to be fully open when the cooling difference value is less than or equal to a first minimum temperature difference value, and determining the opening degree of the unloading electromagnetic valve according to a negative correlation relation between the preset cooling difference value and the opening degree of the unloading electromagnetic valve when the cooling difference value is less than the first maximum temperature difference value and greater than the first minimum temperature difference value; and comparing the opening degree of the unloading electromagnetic valve determined according to the average value of the outlet temperature with the opening degree of the unloading electromagnetic valve determined according to the indoor environment temperature parameter, and selecting the maximum opening degree as the final opening degree of the unloading electromagnetic valve.
Further, the first maximum temperature difference value is 5 ℃, and the first minimum temperature difference value is-1 ℃.
Further, when the working mode is a heating mode, the step of jointly determining the opening degree of the unloading electromagnetic valve according to the average value of the middle temperature of the indoor heat exchanger and the indoor environment temperature parameter comprises the following steps: subtracting an indoor environment temperature parameter from a preset indoor target temperature to obtain a temperature rise difference value, determining the opening degree of the unloading electromagnetic valve to be fully closed when the temperature rise difference value is greater than or equal to a second maximum temperature difference value, determining the opening degree of the unloading electromagnetic valve to be fully open when the temperature rise difference value is less than or equal to a second minimum temperature difference value, and determining the opening degree of the unloading electromagnetic valve according to the negative correlation relationship between the preset temperature rise difference value and the opening degree of the unloading electromagnetic valve when the temperature rise difference value is less than the second maximum temperature difference value and greater than the second minimum temperature difference value; and comparing the opening degree of the unloading electromagnetic valve determined according to the average value of the middle temperature with the opening degree of the unloading electromagnetic valve determined according to the indoor environment temperature parameter, and selecting the maximum opening degree as the final opening degree of the unloading electromagnetic valve.
Further, the second maximum temperature difference value is 5 ℃, and the second minimum temperature difference value is-1 ℃.
Compared with the prior art, the invention has the advantages that the opening of the unloading electromagnetic valve is correspondingly controlled, so that when the demand of each indoor heat exchanger on the refrigerant is low, part of the refrigerant coming out of the air outlet side of the compressor directly flows back to the air return side of the compressor through the unloading electromagnetic valve, and when the demand of each indoor heat exchanger on the refrigerant is lower, the opening of the unloading electromagnetic valve is controlled to be larger, so that the refrigerant coming out of the air outlet side of the compressor is unloaded to the air return side of the compressor more, on one hand, the refrigerant circulation quantity of the indoor unit is reduced, on the other hand, the high-pressure side pressure of the multi-split air system is also reduced, the low-pressure side pressure of the multi-split air system is improved, the reliability of the compressor is enhanced, the problems that the output capacity of the compressor is far higher than the demand of each indoor heat exchanger, the whole multi-split air, The problem that the indoor unit can not continuously heat in the heating mode.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a first flowchart of the present invention.
FIG. 3 is a second flowchart of the present invention.
The system comprises a compressor 1, an outdoor heat exchanger 2, an unloading electromagnetic valve 3, an indoor heat exchanger 4, an electronic expansion valve 6, an outlet temperature sensor 7, a middle temperature sensor 8 and an indoor temperature sensor 9.
Detailed Description
The invention will be further illustrated with reference to specific examples:
referring to fig. 1 to 3, the present embodiment is a large-displacement variable-frequency multi-split system, including an outdoor unit and a plurality of indoor units, each indoor unit includes an indoor heat exchanger 4 and an electronic expansion valve 6, the outdoor unit includes an outdoor heat exchanger 2, a compressor 1 (the compressor 1 is a variable-frequency compressor), an unloading solenoid valve 3, and a four-way valve, wherein an unloading branch is disposed between a gas outlet side and a gas return side of the compressor 1, the unloading solenoid valve 3 is disposed in series on the unloading branch, and the unloading branch can be communicated with the gas outlet side and the gas return side of the compressor 1 by opening the unloading solenoid valve 3; the system also comprises a controller and a plurality of sensors, wherein the plurality of sensors comprise outlet temperature sensors 7 arranged at the outlets of the indoor heat exchangers 4, middle temperature sensors 8 arranged at the middle positions of the indoor sensors and indoor temperature sensors 9 arranged in indoor environments corresponding to the indoor sensors, the controller is simultaneously electrically connected with the sensors, the electronic expansion valves 6 and the unloading electromagnetic valves 3 for data interaction, the opening degree of the unloading electromagnetic valves 3 is correspondingly controlled after comprehensive analysis and judgment are carried out by acquiring the opening and closing information of the electronic expansion valves 6 and the parameter information acquired by the sensors, so that when the requirements of the indoor heat exchangers 4 on the refrigerant are low, the unloading electromagnetic valves 3 are opened to enable the unloading branches to be conducted, and part of the refrigerant coming out of the gas outlet side of the compressor 1 directly flows back to the gas return side of the compressor 1 through the unloading branches, and when the demand of each indoor heat exchanger 4 on the refrigerant is lower, the opening degree of the unloading electromagnetic valve 3 is controlled to be larger, so that the refrigerant coming out of the air outlet side of the compressor 1 is unloaded to the air return side of the compressor 1 more, on one hand, the refrigerant circulation quantity of the indoor unit is reduced, on the other hand, the high-pressure side pressure of the multi-split system is also reduced, the low-pressure side pressure of the multi-split system is improved, the reliability of the compressor 1 is enhanced, and the problems that the whole multi-split system is frequently started and stopped due to the fact that the output capacity of the compressor 1 is far higher than the demand of each indoor heat exchanger 4, the indoor unit cannot continuously refrigerate in the refrigerating mode, and the indoor unit cannot continuously.
The unloading regulation control method of the large-displacement variable-frequency multi-split system comprises the following steps:
if the multi-split system enters a refrigeration mode, the controller judges the start-stop state of each indoor heat exchanger 4 by detecting the start-stop information of each electronic expansion valve 6:
if a plurality of opened indoor heat exchangers 4 are detected, acquiring outlet temperature parameters of the indoor heat exchangers 4 in an opened state and calculating an outlet temperature average value, determining the opening degree of the unloading solenoid valve 3 according to the outlet temperature average value, specifically, determining the opening degree of the unloading solenoid valve 3 to be fully closed when the outlet temperature average value is greater than or equal to a first maximum preset temperature value, determining the opening degree of the unloading solenoid valve 3 to be fully opened when the outlet temperature average value is less than or equal to a first minimum preset temperature value, and determining the opening degree of the unloading solenoid valve 3 according to a negative correlation relation between the preset outlet temperature average value and the opening degree of the unloading solenoid valve 3 when the outlet temperature average value is less than the first maximum preset temperature value and greater than the first minimum preset temperature value, wherein in the embodiment, the negative correlation relation is specifically: the first maximum preset temperature value is 8 ℃, the first minimum preset temperature value is 2 ℃, when the average value of the outlet temperatures is greater than or equal to 8 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 0 degree (namely, fully closed), when the average value of the outlet temperatures is 7 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 60 degrees, when the average value of the outlet temperatures is 6 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 120 degrees, when the average value of the outlet temperatures is 5 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 180 degrees, when the average value of the outlet temperatures is 4 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 240 degrees, when the average value of the outlet temperatures is 3 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 300 degrees, and when the average value of the outlet temperatures is 2 ℃, the opening degree of the unloading solenoid valve 3 is determined;
if only one indoor heat exchanger 4 in the opening state is detected, the indoor environment temperature parameter corresponding to the indoor heat exchanger 4 is obtained, the opening degree of the unloading electromagnetic valve 3 is determined according to the average value of the outlet temperature of the indoor heat exchanger 4 and the indoor environment temperature parameter, specifically, the preset indoor target temperature is subtracted from the indoor environment temperature parameter to obtain a cooling difference value, when the cooling difference value is larger than or equal to the first maximum temperature difference value, it is determined that the opening degree of the unloading solenoid valve 3 is fully closed, and when the cooling difference value is less than or equal to the first minimum temperature difference value, the opening degree of the unloading solenoid valve 3 is determined to be full open, when the temperature reduction difference value is smaller than the first maximum temperature difference value and larger than the first minimum temperature difference value, determining the opening degree of the unloading electromagnetic valve 3 according to the negative correlation between the preset cooling difference value and the opening degree of the unloading electromagnetic valve 3; comparing the opening degree of the unloading solenoid valve 3 determined according to the average value of the outlet temperatures with the opening degree of the unloading solenoid valve 3 determined according to the indoor ambient temperature parameters, and selecting the maximum opening degree as the final opening degree of the unloading solenoid valve 3, in the present embodiment, the first maximum temperature difference value is 5 ℃, the first minimum temperature difference value is-1 ℃, when the cooling difference value is 5 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 0 degree (i.e. fully closed), when the cooling difference value is 4 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 60 degrees, when the cooling difference value is 3 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 120 degrees, when the cooling difference value is 2 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 180 degrees, when the cooling difference value is 1 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 240 degrees, and when the cooling difference value is 0 ℃, the opening degree of the unloading solenoid valve 3 is determined, when the temperature reduction difference is-1 ℃, the opening degree of the unloading electromagnetic valve 3 is determined to be 360 degrees (namely, fully opened); then, if the opening degree of the unloading solenoid valve 3 determined by the average value of the outlet temperatures is 240 degrees and the opening degree of the unloading solenoid valve 3 determined by the indoor ambient temperature parameter is 300 degrees, the final opening degree of the unloading solenoid valve 3 is determined to be 300 degrees.
If the multi-split system enters a heating mode, the controller judges the start-stop state of each indoor heat exchanger 4 by detecting the start-stop information of each electronic expansion valve 6:
if a plurality of opened indoor heat exchangers 4 are detected, acquiring a middle temperature parameter of the indoor heat exchangers 4 in an opened state and calculating a middle temperature average value, determining the opening degree of the unloading solenoid valve 3 according to the middle temperature average value, specifically, when the middle temperature average value is greater than or equal to a second maximum preset temperature value, determining the opening degree of the unloading solenoid valve 3 to be fully opened, when the middle temperature average value is less than or equal to a second minimum preset temperature value, determining the opening degree of the unloading solenoid valve 3 to be fully closed, when the middle temperature average value is less than the second maximum preset temperature value and greater than the second minimum preset temperature value, determining the opening degree of the unloading solenoid valve 3 according to a positive correlation relationship between the preset middle temperature average value and the opening degree of the unloading solenoid valve 3, in the embodiment, the positive correlation relationship is specifically: the second maximum preset temperature value is 55 ℃, the second minimum preset temperature value is 44 ℃, when the average value of the intermediate temperatures is greater than or equal to 55 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 360 degrees (i.e., fully open), when the average value of the intermediate temperatures is 53 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 300 degrees, when the average value of the intermediate temperatures is 51 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 240 degrees, when the average value of the intermediate temperatures is 49 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 180 degrees, when the average value of the intermediate temperatures is 47 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 120 degrees, when the average value of the intermediate temperatures is 45 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 60 degrees, and when the average value of the intermediate temperatures is 44 ℃, the opening degree of the unloading solenoid valve 3;
if only one indoor heat exchanger 4 in the opening state is detected, the indoor environment temperature parameter corresponding to the indoor heat exchanger 4 is obtained, the opening degree of the unloading electromagnetic valve 3 is determined according to the average value of the middle temperature of the indoor heat exchanger 4 and the indoor environment temperature parameter, specifically, the indoor environment temperature parameter is subtracted from the preset indoor target temperature to obtain a temperature rise difference value, when the temperature rise difference value is larger than or equal to a second maximum temperature difference value, it is determined that the opening degree of the unloading solenoid valve 3 is fully closed, and when the temperature rise difference is less than or equal to the second minimum temperature difference, the opening degree of the unloading solenoid valve 3 is determined to be full open, when the temperature rise difference value is smaller than the second maximum temperature difference value and larger than the second minimum temperature difference value, determining the opening degree of the unloading electromagnetic valve 3 according to the negative correlation between the preset temperature rise difference value and the opening degree of the unloading electromagnetic valve 3; comparing the opening degree of the unloading solenoid valve 3 determined according to the average value of the middle temperature with the opening degree of the unloading solenoid valve 3 determined according to the indoor environment temperature parameter, selecting the maximum opening degree as the final opening degree of the unloading solenoid valve 3, in this embodiment, the second maximum temperature difference value is 5 ℃, the second minimum temperature difference value is-1 ℃, when the temperature rise difference value is 5 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 0 degree (i.e. fully closed), when the temperature rise difference value is 4 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 60 degrees, when the temperature rise difference value is 3 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 120 degrees, when the temperature rise difference value is 2 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 180 degrees, when the temperature rise difference value is 1 ℃, the opening degree of the unloading solenoid valve 3 is determined to be 240 degrees, when the temperature rise difference value is 0 ℃, the opening degree of the unloading solenoid valve, when the temperature rise difference is-1 ℃, determining the opening degree of the unloading electromagnetic valve 3 to be 360 degrees (namely, fully open); then, if the opening degree of the unloading solenoid valve 3 determined by the middle temperature average value is 180 degrees and the opening degree of the unloading solenoid valve 3 determined by the indoor ambient temperature parameter is 120 degrees, the final opening degree of the unloading solenoid valve 3 is determined to be 180 degrees.
In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and the equivalent or simple change of the structure, the characteristics and the principle described in the present patent idea is included in the protection scope of the present patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (9)
1. An unloading regulation control method of a large-displacement variable-frequency multi-split system is characterized by comprising the following steps: the multi-split system comprises an outdoor unit and a plurality of indoor units, each indoor unit comprises an indoor heat exchanger (4) and an electronic expansion valve (6), the outdoor unit comprises an outdoor heat exchanger (2), a compressor (1) and an unloading electromagnetic valve (3), and the unloading electromagnetic valve (3) is used for communicating the air outlet side and the air return side of the compressor (1); the control method comprises the following steps: the multi-split system enters a working mode, and the start-stop state of each indoor heat exchanger (4) is detected and judged; if the working mode is a refrigeration mode, acquiring outlet temperature parameters of the indoor heat exchanger (4) in an open state, calculating an outlet temperature average value, and determining the opening degree of the unloading electromagnetic valve (3) according to the outlet temperature average value; if the working mode is the heating mode, acquiring middle temperature parameters of the indoor heat exchanger (4) in an opening state, calculating a middle temperature average value, and determining the opening degree of the unloading electromagnetic valve (3) according to the middle temperature average value; if the working mode is a refrigeration mode, acquiring outlet temperature parameters of the indoor heat exchanger (4) in an open state and calculating an outlet temperature average value, and determining the opening degree of the unloading electromagnetic valve (3) according to the outlet temperature average value comprises the following steps: said determining the opening degree of the unloading solenoid valve (3) according to said average value of the outlet temperature comprises: when the average value of the outlet temperature is greater than or equal to a first maximum preset temperature value, determining that the opening degree of the unloading electromagnetic valve (3) is fully closed, when the average value of the outlet temperature is less than or equal to a first minimum preset temperature value, determining that the opening degree of the unloading electromagnetic valve (3) is fully open, and when the average value of the outlet temperature is less than the first maximum preset temperature value and greater than the first minimum preset temperature value, determining the opening degree of the unloading electromagnetic valve (3) according to the negative correlation relation between the preset average value of the outlet temperature and the opening degree of the unloading electromagnetic valve (3).
2. The unloading regulation control method of the large-capacity variable-frequency multi-split system according to claim 1, characterized in that: the first maximum preset temperature value is 8 ℃, and the first minimum preset temperature value is 2 ℃.
3. The unloading regulation control method of the large-capacity variable-frequency multi-split system according to claim 1, characterized in that: if the working mode is a heating mode, acquiring the middle temperature parameter of the indoor heat exchanger (4) in an open state and calculating the middle temperature average value, and determining the opening degree of the unloading electromagnetic valve (3) according to the middle temperature average value comprises the following steps: when the middle temperature average value is greater than or equal to the second maximum preset temperature value, the opening degree of the unloading electromagnetic valve (3) is determined to be fully opened, when the middle temperature average value is less than or equal to the second minimum preset temperature value, the opening degree of the unloading electromagnetic valve (3) is determined to be fully closed, and when the middle temperature average value is less than the second maximum preset temperature value and is greater than the second minimum preset temperature value, the opening degree of the unloading electromagnetic valve (3) is determined according to the positive correlation relation between the preset middle temperature average value and the opening degree of the unloading electromagnetic valve (3).
4. The unloading regulation control method of the large-capacity variable-frequency multi-split system according to claim 3, characterized in that: the second maximum preset temperature value is 55 ℃, and the second minimum preset temperature value is 44 ℃.
5. The unloading regulation control method of the large-capacity variable-frequency multi-split system according to claim 1, characterized in that: the control method further comprises the following steps: if only one indoor heat exchanger (4) in an opening state is used, acquiring an indoor environment temperature parameter corresponding to the indoor heat exchanger (4), and when the working mode is a refrigeration mode, determining the opening degree of the unloading electromagnetic valve (3) together according to the average value of the outlet temperature of the indoor heat exchanger (4) and the indoor environment temperature parameter; and when the working mode is a heating mode, the opening degree of the unloading electromagnetic valve (3) is determined according to the average value of the middle temperature of the indoor heat exchanger (4) and the indoor environment temperature parameter.
6. The unloading regulation control method of the large-capacity variable-frequency multi-split system according to claim 5, wherein: when the working mode is a refrigeration mode, the step of jointly determining the opening degree of the unloading electromagnetic valve (3) according to the average value of the outlet temperature of the indoor heat exchanger (4) and the indoor environment temperature parameter comprises the following steps: subtracting a preset indoor target temperature from an indoor environment temperature parameter to obtain a cooling difference value, determining that the opening degree of the unloading electromagnetic valve (3) is fully closed when the cooling difference value is greater than or equal to a first maximum temperature difference value, determining that the opening degree of the unloading electromagnetic valve (3) is fully open when the cooling difference value is less than or equal to a first minimum temperature difference value, and determining the opening degree of the unloading electromagnetic valve (3) according to a negative correlation relation between the preset cooling difference value and the opening degree of the unloading electromagnetic valve (3) when the cooling difference value is less than the first maximum temperature difference value and greater than the first minimum temperature difference value; and comparing the opening degree of the unloading electromagnetic valve (3) determined according to the average value of the outlet temperature with the opening degree of the unloading electromagnetic valve (3) determined according to the indoor environment temperature parameter, and selecting the maximum opening degree as the final opening degree of the unloading electromagnetic valve (3).
7. The unloading regulation control method of the large-capacity variable-frequency multi-split system according to claim 6, wherein: the first maximum temperature difference value is 5 ℃, and the first minimum temperature difference value is-1 ℃.
8. The unloading regulation control method of the large-capacity variable-frequency multi-split system according to claim 5, wherein: when the working mode is a heating mode, the step of jointly determining the opening degree of the unloading electromagnetic valve (3) according to the average value of the middle temperature of the indoor heat exchanger (4) and the indoor environment temperature parameter comprises the following steps: subtracting an indoor environment temperature parameter from a preset indoor target temperature to obtain a temperature rise difference value, determining that the opening degree of the unloading electromagnetic valve (3) is fully closed when the temperature rise difference value is greater than or equal to a second maximum temperature difference value, determining that the opening degree of the unloading electromagnetic valve (3) is fully open when the temperature rise difference value is less than or equal to a second minimum temperature difference value, and determining the opening degree of the unloading electromagnetic valve (3) according to a negative correlation relation between the preset temperature rise difference value and the opening degree of the unloading electromagnetic valve (3) when the temperature rise difference value is less than the second maximum temperature difference value and greater than the second minimum temperature difference value; and comparing the opening degree of the unloading electromagnetic valve (3) determined according to the average value of the middle temperature with the opening degree of the unloading electromagnetic valve (3) determined according to the indoor environment temperature parameters, and selecting the maximum opening degree as the final opening degree of the unloading electromagnetic valve (3).
9. The unloading regulation control method of the large-capacity variable-frequency multi-split system according to claim 8, wherein: the second maximum temperature difference value is 5 ℃, and the second minimum temperature difference value is-1 ℃.
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| CN113531856A (en) * | 2020-04-22 | 2021-10-22 | 青岛海尔空调电子有限公司 | Multi-connected air conditioning system and refrigerant flow control method thereof |
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