CN108954677B - Defrosting control method and system of multi-split air conditioning system and storage medium - Google Patents
Defrosting control method and system of multi-split air conditioning system and storage medium Download PDFInfo
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- CN108954677B CN108954677B CN201810809810.XA CN201810809810A CN108954677B CN 108954677 B CN108954677 B CN 108954677B CN 201810809810 A CN201810809810 A CN 201810809810A CN 108954677 B CN108954677 B CN 108954677B
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
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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 provides a defrosting control method and system of a multi-split air-conditioning system, a computer readable storage medium and the multi-split air-conditioning system. The defrosting control method comprises the following steps: after the multi-split system starts a defrosting mode, acquiring defrosting time and outlet temperature of each outdoor heat exchanger; judging whether the multi-split system meets a first defrosting exit condition or not according to the defrosting time and the outlet temperature of each outdoor heat exchanger; when the first defrosting exit condition is met, controlling all the outdoor units to exit the defrosting mode; and when the first defrosting exit condition is not met, controlling the outdoor unit to exit or continue to maintain the defrosting mode according to the defrosting time length and the outlet temperature of each outdoor heat exchanger. The invention solves the problem that when a plurality of outdoor units of the multi-split air conditioning system are connected in parallel, partial outdoor unit heat exchangers are not completely defrosted, improves the heating effect, avoids that all the outdoor units exit the defrosting mode until the last outdoor unit is defrosted, shortens the defrosting time and improves the use comfort.
Description
Technical Field
The invention relates to the technical field of multi-split air conditioners, in particular to a defrosting control method and a defrosting control system of a multi-split system, a computer readable storage medium and the multi-split system.
Background
The three-pipe multi-split air conditioning system has the advantages that multiple outdoor units are connected in parallel, frost conditions of heat exchangers of the outdoor units are different under certain conditions during heating operation, for example, when part of the outdoor units are exposed to the sun, part of the outdoor units are shaded or have great wind influence, the frost conditions are influenced by the installation environment and the heat exchange quality, and if frost of individual outdoor units is thick, the frost may not be completely removed every time, and the heating effect is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the present invention is to provide a defrosting control method for a multi-split air conditioning system.
A second aspect of the present invention is to provide a defrost control system for a multi-split system.
A third aspect of the present invention is directed to a computer-readable storage medium.
A fourth aspect of the present invention is to provide a multi-split system.
In view of the above, according to an aspect of the present invention, a defrosting control method for a multi-split air-conditioning system is provided, the multi-split air-conditioning system including a plurality of outdoor units, the outdoor units including outdoor heat exchangers, the defrosting control method including: after the multi-split system starts a defrosting mode, acquiring defrosting time and outlet temperature of each outdoor heat exchanger; judging whether the multi-split system meets a first defrosting exit condition or not according to the defrosting time and the outlet temperature of each outdoor heat exchanger; when the first defrosting exit condition is met, controlling all the outdoor units to exit the defrosting mode; and when the first defrosting exit condition is not met, controlling the outdoor unit to exit or continue to maintain the defrosting mode according to the defrosting time length and the outlet temperature of each outdoor heat exchanger.
According to the defrosting control method of the multi-split air conditioner system, whether the multi-split air conditioner system meets the first defrosting exit condition or not is judged according to the defrosting time and the outlet temperature of each outdoor heat exchanger, the first defrosting exit condition is met, defrosting of all the outdoor units is completed, all the outdoor units are controlled to exit the defrosting mode, and the comfort of use of an air conditioner is guaranteed. When the first defrosting condition is not met, it is indicated that defrosting of one or more outdoor units is not completed at the moment, the defrosting completion condition of each outdoor unit is determined respectively according to the defrosting time and the outlet temperature of each outdoor heat exchanger, the outdoor units completing defrosting are controlled to exit from the defrosting mode according to the determination result, and the outdoor units which do not completely defrost continue defrosting.
According to the defrosting control method of the multi-split air conditioning system, the technical characteristics can be as follows:
in the above technical solution, preferably, the first defrost exit condition includes: the defrosting time is a first preset time, and the outlet temperature of each outdoor heat exchanger is greater than or equal to the first preset temperature; or the defrosting time is a second preset time, and the minimum outlet temperature in the outlet temperatures of all the outdoor heat exchangers is greater than or equal to the second preset temperature.
In the technical scheme, whether all the outdoor units are defrosted can be judged through the following two conditions, wherein in the first condition, after the multi-split air conditioning system enters a defrosting mode for a first preset time, the outlet temperature of each outdoor heat exchanger is greater than or equal to a first preset temperature, and defrosting of each outdoor unit is finished; secondly, when the multi-split air conditioning system enters the defrosting mode for a second preset time, the minimum value of the outlet temperature of the outdoor heat exchanger is greater than or equal to the second preset temperature, and defrosting of each outdoor unit is finished; one of the two determination conditions may be selected, or the first condition may be determined first, and the second condition may be determined when the first condition is not satisfied. Whether all the outdoor units are defrosted is determined by various judging modes, so that the problem that the individual outdoor units are unclean in defrosting is solved.
In any of the above technical solutions, preferably, the controlling the outdoor unit to exit or continue to maintain the defrosting mode according to the defrosting time and the outlet temperature of each outdoor heat exchanger specifically includes: determining and controlling the outdoor unit of which the outlet temperature meets a second defrosting exit condition to exit the defrosting mode; and determining and controlling the outdoor unit of which the outlet temperature does not meet the second defrosting exit condition to continuously maintain the defrosting mode.
In the technical scheme, whether the outdoor unit exits the defrosting mode or continues to maintain the defrosting mode is controlled by judging that the outlet temperature of the outdoor heat exchanger meets a second defrosting exit condition. Specifically, when one or some of the outdoor units meet the second defrosting condition, which indicates that the outdoor units have finished defrosting, the outdoor units with finished defrosting are controlled to exit the defrosting mode first, so that the situation that all the outdoor units exit the defrosting mode only after the last outdoor unit finishes defrosting is avoided, and the defrosting time of the outdoor units is shortened; when one or some outdoor units do not meet the second defrosting condition, the defrosting of the outdoor units is not finished, the outdoor units with finished defrosting are controlled to continuously keep the defrosting mode, the problem that the defrosting of part of outdoor unit heat exchangers is not clean due to the fact that a short defrosting time is set is avoided, and the heating effect is improved.
In any of the above technical solutions, preferably, the second defrost exit condition includes: the outlet temperature of the outdoor heat exchanger is greater than or equal to a third preset temperature; or the outlet temperature of the outdoor heat exchanger is greater than or equal to the average value of the outlet temperatures of all the outdoor heat exchangers and a fourth preset temperature difference value; or the outlet temperature of the outdoor heat exchanger is less than or equal to the difference value between the maximum outlet temperature and the fifth preset temperature among the outlet temperatures of all the outdoor heat exchangers; wherein the third preset temperature is less than the first preset temperature and the second preset temperature.
In the technical scheme, whether the outdoor units are defrosted completely can be judged by the following conditions, wherein the first condition is determined by comparing the outlet temperature with a third preset temperature; secondly, the difference between the average value of the outlet temperature of each outdoor unit and a preset value (fourth preset temperature) is compared to determine, and if the outlet temperature is greater than the average value of the outlet temperature by a preset value, the outdoor unit is considered to be defrosted completely; thirdly, the defrosting of the outdoor unit is considered to be completed if the outlet temperature is lower than the maximum outlet temperature by a few degrees celsius, as determined by comparing the outlet temperature with the difference between the maximum outlet temperature and a preset value (fifth preset temperature).
In any of the above technical solutions, preferably, after determining and controlling the outdoor unit whose outlet temperature does not satisfy the second defrosting exit condition to continue to maintain the defrosting mode, the method further includes: after a third preset time, when any outdoor unit which continues to maintain the defrosting mode meets a third defrosting exit condition, controlling any outdoor unit to exit the defrosting mode; wherein the third defrost exit condition comprises: the outlet temperature of the outdoor heat exchanger is greater than or equal to a sixth preset temperature, and the sixth preset temperature is less than the third preset temperature.
In the technical scheme, after the outdoor unit continues defrosting for a third preset time without defrosting, the outlet temperature of the outdoor heat exchanger is judged to be greater than or equal to a sixth preset temperature, and the defrosting mode can be quitted if the conditions are met. The sixth preset temperature is lower than the third preset temperature, and the condition that part of the outdoor unit is actually defrosted completely due to the fact that the high outlet temperature threshold value is kept all the time is avoided by decreasing the outlet temperature threshold value exiting the defrosting mode, but the system still judges that the outdoor unit is not defrosted completely and is in the defrosting mode all the time, and the using comfort of the air conditioner is reduced.
In any of the above technical solutions, preferably, the method further includes: and when the defrosting time reaches a fourth preset time, controlling all the outdoor units to exit the defrosting mode.
In the technical scheme, all the outdoor units are controlled to exit the defrosting mode by setting the defrosting time to reach the fourth preset time, so that the problem that the use comfort of the air conditioner is poor due to the fact that individual outdoor units are always in the defrosting mode is avoided.
According to a second aspect of the present invention, there is provided a defrost control system for a multi-split system, the multi-split system including a plurality of outdoor units, the outdoor units including outdoor heat exchangers, comprising: a memory for storing a computer program; a processor for executing a computer program to: after the multi-split system starts a defrosting mode, acquiring defrosting time and outlet temperature of each outdoor heat exchanger; judging whether the multi-split system meets a first defrosting exit condition or not according to the defrosting time and the outlet temperature of each outdoor heat exchanger; when the first defrosting exit condition is met, controlling all the outdoor units to exit the defrosting mode; and when the first defrosting exit condition is not met, controlling the outdoor unit to exit or continue to maintain the defrosting mode according to the defrosting time length and the outlet temperature of each outdoor heat exchanger.
According to the defrosting control system of the multi-split air conditioner system, the memorizer stores a computer program; when the processor executes the computer program, whether the multi-split air conditioner system meets a first defrosting exit condition is judged according to the defrosting time and the outlet temperature of each outdoor heat exchanger, the first defrosting exit condition is met, defrosting of all the outdoor units is completed, all the outdoor units are controlled to exit a defrosting mode, and the comfort of the use of the air conditioner is guaranteed. When the first defrosting condition is not met, it is indicated that defrosting of one or more outdoor units is not completed at the moment, the defrosting completion condition of each outdoor unit is determined respectively according to the defrosting time and the outlet temperature of each outdoor heat exchanger, the outdoor units completing defrosting are controlled to exit from the defrosting mode according to the determination result, and the outdoor units which do not completely defrost continue defrosting.
The defrosting control system of the multi-split air conditioning system according to the present invention may further include the following technical features:
in the above technical solution, preferably, the first defrost exit condition includes: the defrosting time is a first preset time, and the outlet temperature of each outdoor heat exchanger is greater than or equal to the first preset temperature; or the defrosting time is a second preset time, and the minimum outlet temperature in the outlet temperatures of all the outdoor heat exchangers is greater than or equal to the second preset temperature.
In the technical scheme, whether all the outdoor units are defrosted can be judged through the following two conditions, wherein in the first condition, after the multi-split air conditioning system enters a defrosting mode for a first preset time, the outlet temperature of each outdoor heat exchanger is greater than or equal to a first preset temperature, and defrosting of each outdoor unit is finished; secondly, when the multi-split air conditioning system enters the defrosting mode for a second preset time, the minimum value of the outlet temperature of the outdoor heat exchanger is greater than or equal to the second preset temperature, and defrosting of each outdoor unit is finished; one of the two determination conditions may be selected, or the first condition may be determined first, and the second condition may be determined when the first condition is not satisfied. Whether all the outdoor units are defrosted is determined by various judging modes, so that the problem that the individual outdoor units are unclean in defrosting is solved.
In any of the above technical solutions, preferably, the processor is specifically configured to execute the computer program to: determining and controlling the outdoor unit of which the outlet temperature meets a second defrosting exit condition to exit the defrosting mode; and determining and controlling the outdoor unit of which the outlet temperature does not meet the second defrosting exit condition to continuously maintain the defrosting mode.
In the technical scheme, whether the outdoor unit exits the defrosting mode or continues to maintain the defrosting mode is controlled by judging that the outlet temperature of the outdoor heat exchanger meets a second defrosting exit condition. Specifically, when one or some of the outdoor units meet the second defrosting condition, which indicates that the outdoor units have finished defrosting, the outdoor units with finished defrosting are controlled to exit the defrosting mode first, so that the situation that all the outdoor units exit the defrosting mode only after the last outdoor unit finishes defrosting is avoided, and the defrosting time of the outdoor units is shortened; when one or some outdoor units do not meet the second defrosting condition, the defrosting of the outdoor units is not finished, the outdoor units with finished defrosting are controlled to continuously keep the defrosting mode, the problem that the defrosting of part of outdoor unit heat exchangers is not clean due to the fact that a short defrosting time is set is avoided, and the heating effect is improved.
In any of the above technical solutions, preferably, the second defrost exit condition includes: the outlet temperature of the outdoor heat exchanger is greater than or equal to a third preset temperature; or the outlet temperature of the outdoor heat exchanger is greater than or equal to the average value of the outlet temperatures of all the outdoor heat exchangers and a fourth preset temperature difference value; or the outlet temperature of the outdoor heat exchanger is less than or equal to the difference value between the maximum outlet temperature and the fifth preset temperature among the outlet temperatures of all the outdoor heat exchangers; wherein the third preset temperature is less than the first preset temperature and the second preset temperature.
In the technical scheme, whether the outdoor units are defrosted completely can be judged by the following conditions, wherein the first condition is determined by comparing the outlet temperature with a third preset temperature; secondly, the difference between the average value of the outlet temperature of each outdoor unit and a preset value (fourth preset temperature) is compared to determine, and if the outlet temperature is greater than the average value of the outlet temperature by a preset value, the outdoor unit is considered to be defrosted completely; thirdly, the defrosting of the outdoor unit is considered to be completed if the outlet temperature is lower than the maximum outlet temperature by a few degrees celsius, as determined by comparing the outlet temperature with the difference between the maximum outlet temperature and a preset value (fifth preset temperature).
In any of the above solutions, preferably, the processor is further configured to execute the computer program to: after a third preset time, when any outdoor unit which continues to maintain the defrosting mode meets a third defrosting exit condition, controlling any outdoor unit to exit the defrosting mode; wherein the third defrost exit condition comprises: the outlet temperature of the outdoor heat exchanger is greater than or equal to a sixth preset temperature, and the sixth preset temperature is less than the third preset temperature.
In the technical scheme, after the outdoor unit continues defrosting for a third preset time without defrosting, the outlet temperature of the outdoor heat exchanger is judged to be greater than or equal to a sixth preset temperature, and the defrosting mode can be quitted if the conditions are met. The sixth preset temperature is lower than the third preset temperature, and the condition that part of the outdoor unit is actually defrosted completely due to the fact that the high outlet temperature threshold value is kept all the time is avoided by decreasing the outlet temperature threshold value exiting the defrosting mode, but the system still judges that the outdoor unit is not defrosted completely and is in the defrosting mode all the time, and the using comfort of the air conditioner is reduced.
In any of the above solutions, preferably, the processor is further configured to execute the computer program to: and when the defrosting time reaches a fourth preset time, controlling all the outdoor units to exit the defrosting mode.
In the technical scheme, all the outdoor units are controlled to exit the defrosting mode by setting the defrosting time to reach the fourth preset time, so that the problem that the use comfort of the air conditioner is poor due to the fact that individual outdoor units are always in the defrosting mode is avoided.
According to a third aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, the computer program, when being executed by a processor, implementing the steps of the defrosting control method of the multi-split system according to any one of the above aspects.
The computer-readable storage medium provided by the present invention stores thereon a computer program, and when the computer program is executed by a processor, the steps of the method for controlling defrosting of a multi-split air-conditioning system in any of the above technical solutions are implemented, so that the method has all the technical effects of the method for controlling defrosting of a multi-split air-conditioning system, and will not be described herein again.
According to a fourth aspect of the present invention, there is provided a multi-split system, comprising: a defrost control system for a multi-split system as in any one of the above claims, or a computer readable storage medium as in any one of the above claims.
The invention provides a multi-split system, comprising: as for the defrosting control system of the multi-split air-conditioning system in any of the above technical solutions, or the computer-readable storage medium in any of the above technical solutions, all technical effects of the defrosting control system of the multi-split air-conditioning system or the computer-readable storage medium are achieved, and are not described herein again.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart illustrating a defrost control method of a multi-split system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a defrost control method of a multi-split system according to another embodiment of the present invention;
fig. 3 is a flowchart illustrating a defrost control method of a multi-split system according to still another embodiment of the present invention;
fig. 4 is a flowchart illustrating a defrost control method of a multi-split system according to still another embodiment of the present invention;
fig. 5 is a flowchart illustrating a defrost control method of a multi-split system according to still another embodiment of the present invention;
fig. 6 is a schematic structural diagram illustrating a multi-split system according to an embodiment of the present invention;
FIG. 7 illustrates a schematic block diagram of a defrost control system for a multi-online system in accordance with an embodiment of the present invention;
fig. 8 shows a schematic block diagram of a multi-split system according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the names of the components in fig. 6 is:
the system comprises a main engine 1, a first compressor 11, a first low-pressure tank 12, a first four-way valve 13, a second four-way valve 14, a first outdoor heat exchanger 15, a first high-pressure air pipe 16, a second low-pressure air pipe 17, a slave engine 2, a second compressor 21, a second low-pressure tank 22, a third four-way valve 23, a fourth four-way valve 24, a second outdoor heat exchanger 25, a second high-pressure air pipe 26, a second low-pressure air pipe 27, a defrosting valve 28, a first indoor unit 3, a first electromagnetic valve 31, a second electromagnetic valve 32, a second indoor unit 4, a third electromagnetic valve 41 and a fourth electromagnetic valve 42.
Detailed Description
So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
Fig. 1 is a schematic flow chart of a defrosting control method of a multi-split air-conditioning system according to an embodiment of the present invention. As shown in fig. 1, the method includes:
104, judging whether the multi-split system meets a first defrosting exit condition or not according to the defrosting time and the outlet temperature of each outdoor heat exchanger;
and 106, when the first defrosting exit condition is met, controlling all the outdoor units to exit the defrosting mode, and when the first defrosting exit condition is not met, controlling the outdoor units to exit or continuously maintain the defrosting mode according to the defrosting time length and the outlet temperature of each outdoor heat exchanger.
According to the defrosting control method of the multi-split air conditioner system, whether the multi-split air conditioner system meets the first defrosting exit condition or not is judged according to the defrosting time and the outlet temperature of each outdoor heat exchanger, the first defrosting exit condition is met, defrosting of all the outdoor units is completed, all the outdoor units are controlled to exit the defrosting mode, and the comfort of use of an air conditioner is guaranteed. When the first defrosting condition is not met, it is indicated that defrosting of one or more outdoor units is not completed at the moment, the defrosting completion condition of each outdoor unit is determined respectively according to the defrosting time and the outlet temperature of each outdoor heat exchanger, the outdoor units completing defrosting are controlled to exit from the defrosting mode according to the determination result, and the outdoor units which do not completely defrost continue defrosting.
In the above embodiment, preferably, the first defrost exit condition includes: the defrosting time is a first preset time, and the outlet temperature of each outdoor heat exchanger is greater than or equal to the first preset temperature; or the defrosting time is a second preset time, and the minimum outlet temperature in the outlet temperatures of all the outdoor heat exchangers is greater than or equal to the second preset temperature.
In the embodiment, whether defrosting of all the outdoor units is finished can be judged by two conditions, namely, after the multi-split air conditioning system enters a defrosting mode for a first preset time, the outlet temperature of each outdoor heat exchanger is greater than or equal to a first preset temperature, which indicates that defrosting of each outdoor unit is finished; secondly, when the multi-split air conditioning system enters the defrosting mode for a second preset time, the minimum value of the outlet temperature of the outdoor heat exchanger is greater than or equal to the second preset temperature, and defrosting of each outdoor unit is finished; one of the two determination conditions may be selected, or the first condition may be determined first, and the second condition may be determined when the first condition is not satisfied. Whether all the outdoor units are defrosted is determined by various judging modes, so that the problem that the individual outdoor units are unclean in defrosting is solved.
Fig. 2 is a flowchart illustrating a defrost control method of a multi-split system according to another embodiment of the present invention. Wherein, the method comprises the following steps:
step 202, after the multi-split system starts a defrosting mode, acquiring defrosting time and outlet temperature of each outdoor heat exchanger;
and step 208, determining and controlling the outdoor unit of which the outlet temperature of the outdoor heat exchanger meets the second defrosting exit condition to exit the defrosting mode, and determining and controlling the outdoor unit of which the outlet temperature of the outdoor heat exchanger does not meet the second defrosting exit condition to continuously keep the defrosting mode.
In this embodiment, whether the outdoor unit exits the defrost mode or continues to maintain the defrost mode is controlled by determining that the outlet temperature of the outdoor heat exchanger satisfies the second defrost exit condition. Specifically, when one or some of the outdoor units meet the second defrosting condition, which indicates that the outdoor units have finished defrosting, the outdoor units with finished defrosting are controlled to exit the defrosting mode first, so that the situation that all the outdoor units exit the defrosting mode only after the last outdoor unit finishes defrosting is avoided, and the defrosting time of the outdoor units is shortened; when one or some outdoor units do not meet the second defrosting condition, the defrosting of the outdoor units is not finished, the outdoor units with finished defrosting are controlled to continuously keep the defrosting mode, the problem that the defrosting of part of outdoor unit heat exchangers is not clean due to the fact that a short defrosting time is set is avoided, and the heating effect is improved.
In any of the above embodiments, preferably, the second defrost exit condition comprises: the outlet temperature of the outdoor heat exchanger is greater than or equal to a third preset temperature; or the outlet temperature of the outdoor heat exchanger is greater than or equal to the average value of the outlet temperatures of all the outdoor heat exchangers and a fourth preset temperature difference value; or the outlet temperature of the outdoor heat exchanger is less than or equal to the difference value between the maximum outlet temperature and the fifth preset temperature among the outlet temperatures of all the outdoor heat exchangers; wherein the third preset temperature is less than the first preset temperature and the second preset temperature.
In this embodiment, whether the outdoor units are all defrosted can be determined by comparing the outlet temperature with a third preset temperature; secondly, the difference between the average value of the outlet temperature of each outdoor unit and a preset value (fourth preset temperature) is compared to determine, and if the outlet temperature is greater than the average value of the outlet temperature by a preset value, the outdoor unit is considered to be defrosted completely; thirdly, the defrosting of the outdoor unit is considered to be completed if the outlet temperature is lower than the maximum outlet temperature by a few degrees celsius, as determined by comparing the outlet temperature with the difference between the maximum outlet temperature and a preset value (fifth preset temperature).
Fig. 3 is a flowchart illustrating a defrost control method of a multi-split system according to still another embodiment of the present invention. Wherein, the method comprises the following steps:
step 302, after the multi-split system starts a defrosting mode, acquiring defrosting time and outlet temperature of each outdoor heat exchanger;
step 308, determining and controlling the outdoor unit with the outlet temperature of the outdoor heat exchanger meeting the second defrosting exit condition to exit the defrosting mode, and determining and controlling the outdoor unit with the outlet temperature of the outdoor heat exchanger not meeting the second defrosting exit condition to continue to maintain the defrosting mode;
and step 310, after a third preset time, when any outdoor unit which continues to maintain the defrosting mode meets a third defrosting exit condition, controlling any outdoor unit to exit the defrosting mode.
Wherein the third defrost exit condition comprises: the outlet temperature of the outdoor heat exchanger is greater than or equal to a sixth preset temperature, and the sixth preset temperature is less than the third preset temperature.
In this embodiment, after the outdoor unit continues defrosting for a third preset time period without defrosting, it is determined that the outlet temperature of the outdoor heat exchanger is greater than or equal to the sixth preset temperature, and the defrosting mode can be exited when the conditions are met. The sixth preset temperature is lower than the third preset temperature, and the condition that part of the outdoor unit is actually defrosted completely due to the fact that the high outlet temperature threshold value is kept all the time is avoided by decreasing the outlet temperature threshold value exiting the defrosting mode, but the system still judges that the outdoor unit is not defrosted completely and is in the defrosting mode all the time, and the using comfort of the air conditioner is reduced.
Fig. 4 is a flowchart illustrating a defrost control method of a multi-split system according to still another embodiment of the present invention. Wherein, the method comprises the following steps:
step 408, determining and controlling the outdoor unit of which the outlet temperature of the outdoor heat exchanger meets the second defrosting exit condition to exit the defrosting mode, and determining and controlling the outdoor unit of which the outlet temperature of the outdoor heat exchanger does not meet the second defrosting exit condition to continuously keep the defrosting mode;
step 410, after a third preset time, when any outdoor unit which continues to maintain the defrosting mode meets a third defrosting exit condition, controlling any outdoor unit to exit the defrosting mode;
in step 412, when the defrosting time reaches a fourth preset time, all the outdoor units are controlled to exit the defrosting mode.
Wherein the third defrost exit condition comprises: the outlet temperature of the outdoor heat exchanger is greater than or equal to a sixth preset temperature, and the sixth preset temperature is less than the third preset temperature.
In the embodiment, the defrosting time duration is set to reach the fourth preset time duration, all the outdoor units are controlled to exit the defrosting mode, and the condition that the comfort of the air conditioner is poor due to the fact that individual outdoor units are always in the defrosting mode is avoided.
An embodiment of the present invention is described below with reference to fig. 5 and 6.
In this embodiment, the outlet temperature T3i of each outdoor unit heat exchanger is detected, the defrosting exit temperature A, B, C, D and the defrosting exit time T1, T2 and T3 are preset, and the average temperature T3 (T3) when defrosting exits is calculatedAverage) As shown in fig. 5, the specific control method includes:
in step 504, after time t1, whether any of the following points is satisfied is judged: firstly, all the outdoor units T3i are more than or equal to A; ② after T2 lasting, T3minIf yes, go to step 506, if no, go to step 508;
step 510, the outdoor unit meeting the conditions exits the defrosting mode;
and step 514, after defrosting is continued for t3, the defrosting mode is exited.
In step 508, the determining conditions may also be: t3maxT3i is more than or equal to E or T3i is more than or equal to F (F is a preset value and is less than A and B values); t3minMinimum of all external machine heat exchanger outlet temperatures, T3maxThe maximum value of the outlet temperature of all the external machine heat exchangers.
In this embodiment, each outdoor unit enters the defrost mode and exits the defrost mode by controlling the power-on or power-off of the corresponding four-way valve. Fig. 6 is a block diagram illustrating a multi-connected system in an embodiment, and as shown in fig. 6, the multi-connected system includes: two outdoor units (master unit 1 and slave unit 2), a first indoor unit 3 and a second indoor unit 4. Each outdoor unit comprises a corresponding compressor, a low-pressure tank, two four-way valves, an outdoor heat exchanger, a high-pressure air pipe and a low-pressure air pipe. Each indoor unit comprises two corresponding electromagnetic valves. Specifically, the host 1 includes: a first compressor 11, a first low-pressure tank 12, a first four-way valve 13, a second four-way valve 14, a first outdoor heat exchanger 15, a first high-pressure air pipe 16 and a second low-pressure air pipe 17; the slave 2 includes: a second compressor 21, a second low-pressure tank 22, a third four-way valve 23, a fourth four-way valve 24, a second outdoor heat exchanger 25, a second high-pressure gas pipe 26, and a second low-pressure gas pipe 27; the first indoor unit 3 comprises a first solenoid valve 31 and a second solenoid valve 32; the second indoor unit 4 includes a third solenoid valve 41 and a fourth solenoid valve 42. The specific connection relationship of each component is shown in fig. 6, and the specific working process is as follows: an inner machine (the second inner machine 4) is used for cooling, an inner machine is used for heating (the first inner machine 3), SV1B (the second electromagnetic valve 32) and SV2A (the third electromagnetic valve 41) are opened, SV1A (the first electromagnetic valve 31) and SV2B (the fourth electromagnetic valve 42) are closed, if the main machine 1 is defrosted completely at the moment, the auxiliary machine 2 still defrostes to continue defrosting, the host 1 exits the defrosting mode first, the first four-way valve 13 is powered on, the second four-way valve 14 is powered off to be converted into the heating mode, the high-pressure and high-temperature refrigerant of the host 1 passes through the first compressor 11, the second four-way valve 14, the first high-pressure air pipe 16 and the second electromagnetic valve 32 and then flows to the heating indoor unit (the first indoor unit 3), a part of refrigerant flowing out of the heating indoor unit returns to the second outdoor heat exchanger 25 from the liquid pipe, a part of refrigerant flows to the refrigerating indoor unit (the second indoor unit 4) to continue to be evaporated and refrigerated, and the refrigerant flowing out of the refrigerating indoor unit returns to the first compressor 11. The high-pressure high-temperature refrigerant of the slave compressor (the second compressor 21) firstly flows to the slave heat exchanger (the second outdoor heat exchanger 25), the defrosting of the slave heat exchanger is continuously carried out, part of the condensed refrigerant flows to the master heat exchanger (the first outdoor heat exchanger 15) to be evaporated and then returns to the first compressor 11, and part of the refrigerant directly returns to the second compressor 21 from the defrosting valve 28 (at the moment, the third four-way valve 23 is powered off, and the fourth four-way valve 24 is powered on to keep the defrosting mode). After the slave 2 is defrosted completely, the third four-way valve 23 is powered on, the fourth four-way valve 24 is switched to a heating mode after being powered off, and the heating operation is started synchronously with the master 1.
In this embodiment, solve when many outer machines parallel operation partial outer machine because of the poor frosting of heat transfer is very serious, can not totally the clean problem of frost when leading to the defrosting, improved outer machine's heat transfer ability, promote user's comfort in utilization simultaneously.
In a second aspect of the present invention, a defrost control system 700 of a multi-split system is provided, and fig. 7 is a block diagram illustrating a defrost control system 700 of a multi-split system according to an embodiment of the present invention. As shown in fig. 7, the defrost control system 700 of the multi-split system includes: a memory 702 for storing a computer program; a processor 704 for executing a computer program to: after the multi-split system starts a defrosting mode, acquiring defrosting time and outlet temperature of each outdoor heat exchanger; judging whether the multi-split system meets a first defrosting exit condition or not according to the defrosting time and the outlet temperature of each outdoor heat exchanger; when the first defrosting exit condition is met, controlling all the outdoor units to exit the defrosting mode; and when the first defrosting exit condition is not met, controlling the outdoor unit to exit or continue to maintain the defrosting mode according to the defrosting time length and the outlet temperature of each outdoor heat exchanger.
In the defrosting control system 700 of the multi-split air conditioning system provided by the invention, a memory 702 stores a computer program; when the processor 704 executes the computer program, whether the multi-split air conditioner system meets the first defrosting exit condition is judged according to the defrosting time and the outlet temperature of each outdoor heat exchanger, the first defrosting exit condition is met, defrosting of all the outdoor units is completed, and then all the outdoor units are controlled to exit the defrosting mode, so that the comfort of the use of the air conditioner is ensured. When the first defrosting condition is not met, it is indicated that defrosting of one or more outdoor units is not completed at the moment, the defrosting completion condition of each outdoor unit is determined respectively according to the defrosting time and the outlet temperature of each outdoor heat exchanger, the outdoor units completing defrosting are controlled to exit from the defrosting mode according to the determination result, and the outdoor units which do not completely defrost continue defrosting.
In the above embodiment, preferably, the first defrost exit condition includes: the defrosting time is a first preset time, and the outlet temperature of each outdoor heat exchanger is greater than or equal to the first preset temperature; or the defrosting time is a second preset time, and the minimum outlet temperature in the outlet temperatures of all the outdoor heat exchangers is greater than or equal to the second preset temperature.
In the embodiment, whether defrosting of all the outdoor units is finished can be judged by two conditions, namely, after the multi-split air conditioning system enters a defrosting mode for a first preset time, the outlet temperature of each outdoor heat exchanger is greater than or equal to a first preset temperature, which indicates that defrosting of each outdoor unit is finished; secondly, when the multi-split air conditioning system enters the defrosting mode for a second preset time, the minimum value of the outlet temperature of the outdoor heat exchanger is greater than or equal to the second preset temperature, and defrosting of each outdoor unit is finished; one of the two determination conditions may be selected, or the first condition may be determined first, and the second condition may be determined when the first condition is not satisfied. Whether all the outdoor units are defrosted is determined by various judging modes, so that the problem that the individual outdoor units are unclean in defrosting is solved.
In any of the above embodiments, preferably, the processor 704 is specifically configured to execute a computer program to: determining and controlling the outdoor unit of which the outlet temperature meets a second defrosting exit condition to exit the defrosting mode; and determining and controlling the outdoor unit of which the outlet temperature does not meet the second defrosting exit condition to continuously maintain the defrosting mode.
In this embodiment, whether the outdoor unit exits the defrost mode or continues to maintain the defrost mode is controlled by determining that the outlet temperature of the outdoor heat exchanger satisfies the second defrost exit condition. Specifically, when one or some of the outdoor units meet the second defrosting condition, which indicates that the outdoor units have finished defrosting, the outdoor units with finished defrosting are controlled to exit the defrosting mode first, so that the situation that all the outdoor units exit the defrosting mode only after the last outdoor unit finishes defrosting is avoided, and the defrosting time of the outdoor units is shortened; when one or some outdoor units do not meet the second defrosting condition, the defrosting of the outdoor units is not finished, the outdoor units with finished defrosting are controlled to continuously keep the defrosting mode, the problem that the defrosting of part of outdoor unit heat exchangers is not clean due to the fact that a short defrosting time is set is avoided, and the heating effect is improved.
In any of the above embodiments, preferably, the second defrost exit condition comprises: the outlet temperature of the outdoor heat exchanger is greater than or equal to a third preset temperature; or the outlet temperature of the outdoor heat exchanger is greater than or equal to the average value of the outlet temperatures of all the outdoor heat exchangers and a fourth preset temperature difference value; or the outlet temperature of the outdoor heat exchanger is less than or equal to the difference value between the maximum outlet temperature and the fifth preset temperature among the outlet temperatures of all the outdoor heat exchangers; wherein the third preset temperature is less than the first preset temperature and the second preset temperature.
In this embodiment, whether the outdoor units are all defrosted can be determined by comparing the outlet temperature with a third preset temperature; secondly, the difference between the average value of the outlet temperature of each outdoor unit and a preset value (fourth preset temperature) is compared to determine, and if the outlet temperature is greater than the average value of the outlet temperature by a preset value, the outdoor unit is considered to be defrosted completely; thirdly, the defrosting of the outdoor unit is considered to be completed if the outlet temperature is lower than the maximum outlet temperature by a few degrees celsius, as determined by comparing the outlet temperature with the difference between the maximum outlet temperature and a preset value (fifth preset temperature).
In any of the above embodiments, preferably, the processor 704 is further configured to execute a computer program to: after a third preset time, when any outdoor unit which continues to maintain the defrosting mode meets a third defrosting exit condition, controlling any outdoor unit to exit the defrosting mode; wherein the third defrost exit condition comprises: the outlet temperature of the outdoor heat exchanger is greater than or equal to a sixth preset temperature, and the sixth preset temperature is less than the third preset temperature.
In this embodiment, after the outdoor unit continues defrosting for a third preset time period without defrosting, it is determined that the outlet temperature of the outdoor heat exchanger is greater than or equal to the sixth preset temperature, and the defrosting mode can be exited when the conditions are met. The sixth preset temperature is lower than the third preset temperature, and the condition that part of the outdoor unit is actually defrosted completely due to the fact that the high outlet temperature threshold value is kept all the time is avoided by decreasing the outlet temperature threshold value exiting the defrosting mode, but the system still judges that the outdoor unit is not defrosted completely and is in the defrosting mode all the time, and the using comfort of the air conditioner is reduced.
In any of the above embodiments, preferably, the processor 704 is further configured to execute a computer program to: and when the defrosting time reaches a fourth preset time, controlling all the outdoor units to exit the defrosting mode.
In the embodiment, the defrosting time duration is set to reach the fourth preset time duration, all the outdoor units are controlled to exit the defrosting mode, and the condition that the comfort of the air conditioner is poor due to the fact that individual outdoor units are always in the defrosting mode is avoided.
In an embodiment of the third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the defrosting control method of the multi-split air-conditioning system in any of the above embodiments.
The computer-readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of the defrosting control method of the multi-split air-conditioning system in any of the embodiments described above, so that the method has all technical effects of the defrosting control method of the multi-split air-conditioning system, and is not described herein again.
In an embodiment of a fourth aspect of the present invention, a multi-split system 800 is provided, and fig. 8 shows a schematic block diagram of the multi-split system 800 according to an embodiment of the present invention. As shown in fig. 8, the multi-split system 800 includes: a defrost control system 802 for a multi-split system as in any of the above embodiments.
The present invention provides a multi-split system 800, including: as described above, the defrosting control system 802 of the multi-split system in any of the embodiments has all the technical effects of the defrosting control system 802 of the multi-split system, and will not be described herein again.
A multi-split system according to another embodiment of the present invention includes: a computer readable storage medium as in any one of the above embodiments.
The multi-split system of this embodiment includes: the computer-readable storage medium in any of the above embodiments, therefore, has all the technical effects of the computer-readable storage medium, and will not be described herein again.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The defrosting control method of a multi-split air conditioning system is characterized in that the multi-split air conditioning system comprises a plurality of outdoor units, each outdoor unit comprises an outdoor heat exchanger, and the defrosting control method comprises the following steps:
after the multi-split system starts a defrosting mode, acquiring defrosting time and outlet temperature of each outdoor heat exchanger;
judging whether the multi-split air conditioner system meets a first defrosting exit condition or not according to the defrosting duration and the outlet temperature of each outdoor heat exchanger;
when the first defrosting exit condition is met, controlling all the outdoor units to exit the defrosting mode; and
when the first defrosting exit condition is not met, controlling the outdoor unit to exit or continuously keep the defrosting mode according to the defrosting time length and the outlet temperature of each outdoor heat exchanger;
the controlling the outdoor unit to exit or continue to maintain the defrosting mode according to the defrosting time and the outlet temperature of each outdoor heat exchanger specifically includes:
determining and controlling the outdoor unit of which the outlet temperature meets a second defrosting exit condition to exit the defrosting mode; and
determining and controlling the outdoor unit of which the outlet temperature does not meet the second defrosting exit condition to continuously maintain the defrosting mode;
the first defrost exit condition comprises:
the defrosting time is a first preset time, and the outlet temperature of each outdoor heat exchanger is greater than or equal to the first preset temperature; or
The defrosting time is a second preset time, and the minimum outlet temperature of the outlet temperatures of all the outdoor heat exchangers is greater than or equal to the second preset temperature;
the second defrost exit condition comprises:
the outlet temperature of the outdoor heat exchanger is greater than or equal to a third preset temperature; or
The outlet temperature of the outdoor heat exchanger is greater than or equal to the average value of the outlet temperatures of all the outdoor heat exchangers and a fourth preset temperature difference value; or
The outlet temperature of the outdoor heat exchanger is less than or equal to the difference value between the maximum outlet temperature and the fifth preset temperature among the outlet temperatures of all the outdoor heat exchangers;
wherein the third preset temperature is less than the first preset temperature and the second preset temperature.
2. The defrosting control method of a multi-split system as set forth in claim 1, further comprising, after the determining and controlling the outdoor units whose outlet temperatures of the outdoor heat exchangers do not satisfy the second defrosting exit condition to continue to maintain the defrosting mode:
after a third preset time, when any outdoor unit which continues to maintain the defrosting mode meets a third defrosting exit condition, controlling any outdoor unit to exit the defrosting mode;
wherein the third defrost exit condition comprises: the outlet temperature of the outdoor heat exchanger is greater than or equal to a sixth preset temperature, and the sixth preset temperature is less than the third preset temperature.
3. The defrosting control method of a multi-split system as set forth in claim 1 or 2, further comprising:
and when the defrosting time reaches a fourth preset time, controlling all the outdoor units to exit the defrosting mode.
4. A defrost control system for a multi-split system, the multi-split system comprising a plurality of outdoor units, the outdoor units comprising outdoor heat exchangers, comprising:
a memory for storing a computer program;
a processor for executing the computer program to:
after the multi-split system starts a defrosting mode, acquiring defrosting time and outlet temperature of each outdoor heat exchanger;
judging whether the multi-split air conditioner system meets a first defrosting exit condition or not according to the defrosting duration and the outlet temperature of each outdoor heat exchanger;
when the first defrosting exit condition is met, controlling all the outdoor units to exit the defrosting mode; and
when the first defrosting exit condition is not met, controlling the outdoor unit to exit or continuously keep the defrosting mode according to the defrosting time length and the outlet temperature of each outdoor heat exchanger;
the processor is specifically configured to execute the computer program to:
determining and controlling the outdoor unit of which the outlet temperature meets a second defrosting exit condition to exit the defrosting mode; and
determining and controlling the outdoor unit of which the outlet temperature does not meet the second defrosting exit condition to continuously maintain the defrosting mode;
the first defrost exit condition comprises:
the defrosting time is a first preset time, and the outlet temperature of each outdoor heat exchanger is greater than or equal to the first preset temperature; or
The defrosting time is a second preset time, and the minimum outlet temperature of the outlet temperatures of all the outdoor heat exchangers is greater than or equal to the second preset temperature;
the second defrost exit condition comprises:
the outlet temperature of the outdoor heat exchanger is greater than or equal to a third preset temperature; or
The outlet temperature of the outdoor heat exchanger is greater than or equal to the average value of the outlet temperatures of all the outdoor heat exchangers and a fourth preset temperature difference value; or
The outlet temperature of the outdoor heat exchanger is less than or equal to the difference value between the maximum outlet temperature and the fifth preset temperature among the outlet temperatures of all the outdoor heat exchangers;
wherein the third preset temperature is less than the first preset temperature and the second preset temperature.
5. A defrost control system for a multi-online system as in claim 4, said processor further for executing said computer program to:
after a third preset time, when any outdoor unit which continues to maintain the defrosting mode meets a third defrosting exit condition, controlling any outdoor unit to exit the defrosting mode;
wherein the third defrost exit condition comprises: the outlet temperature of the outdoor heat exchanger is greater than or equal to a sixth preset temperature, and the sixth preset temperature is less than the third preset temperature.
6. The defrost control system of a multi-online system as in claim 4 or 5, wherein the processor is further configured to execute the computer program to:
and when the defrosting time reaches a fourth preset time, controlling all the outdoor units to exit the defrosting mode.
7. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the defrost control method of a multi-split air system according to any of the claims 1-3.
8. A multiple on-line system, comprising: a defrost control system of a multi-split system as claimed in any one of claims 4 to 6, or a computer readable storage medium as claimed in claim 7.
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| CN110332653B (en) * | 2019-07-10 | 2020-07-24 | 珠海格力电器股份有限公司 | Outdoor unit defrosting control method, device and equipment |
| CN111237982B (en) * | 2020-01-14 | 2021-11-05 | 广东美的暖通设备有限公司 | Air conditioner, control method and device thereof, electronic equipment and storage medium |
| CN112556094A (en) * | 2020-12-04 | 2021-03-26 | 四川长虹空调有限公司 | Air conditioner defrosting control method |
| CN114963451B (en) * | 2022-05-30 | 2023-08-18 | 宁波奥克斯电气股份有限公司 | Multi-module multi-split defrosting control method and device and air conditioner |
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