Defrosting method and device for multi-split air conditioner, multi-split air conditioner and computer readable storage medium

Abstract

The invention relates to the technical field of air conditioners, and discloses a defrosting method for a multi-split air conditioner, the multi-split air conditioner comprises a plurality of outdoor units connected in parallel, and the rated capacities of the outdoor units are different; the method comprises the steps that under the condition that the multi-split air conditioner operates in a defrosting mode, defrosting operation parameters of all outdoor units are recorded; the defrosting operation parameters comprise the defrosting duration and the defrosting operation frequency of the compressor; under the condition that the defrosting duration of one or more outdoor units is larger than the reference duration, the defrosting operation frequency of each target outdoor unit is corrected upwards, so that the target operation frequency is obtained; the target outdoor unit is an outdoor unit of which the defrosting duration is greater than the reference duration; and under the condition that the multi-split air conditioner runs in the defrosting mode next time, all the target outdoor units are controlled to execute the corresponding target running frequencies. According to the method, the overall defrosting duration of the system can be effectively improved. The invention further discloses a defrosting device for the multi-split air conditioner, the multi-split air conditioner and a computer readable storage medium.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, for example, relates to a defrosting method and device for a multi-split air conditioner, a multi-split air conditioner and a computer readable storage medium. BACKGROUND

[0002] In the installation process of the multi-split air conditioner, in order to reduce the laying quantity of the refrigerant main pipeline, several outdoor units are often connected in parallel to form a multi-outdoor-unit parallel system with larger capacity. Each outdoor unit in the system controls a single outdoor unit, multiple outdoor units or all outdoor units to perform refrigeration or heating operation according to the indoor side start-up load. In actual use, due to the different capacities of the parallel outdoor units, when defrosting control is performed in winter, the outdoor units with small capacity have the problems of incomplete defrosting or too long overall system defrosting time, which further leads to poor system heating effect.

[0003] The related technology discloses a defrosting control method of a multi-split system, comprising: obtaining a defrosting time and an outlet temperature of each outdoor heat exchanger after the multi-split system starts a defrosting mode; determining whether the multi-split system meets a first defrosting exit condition according to the defrosting time and the outlet temperature of each outdoor heat exchanger; when the first defrosting exit condition is met, controlling all outdoor units to exit the defrosting mode; and when the first defrosting exit condition is not met, controlling the outdoor units to exit or continue to maintain the defrosting mode according to the defrosting time and the outlet temperature of each outdoor heat exchanger.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related technology:

[0005] Although the related technology can solve the problem of incomplete defrosting, it cannot solve the problem of too long overall system defrosting time.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a brief overview is given below. The overview is not an overall description of the embodiments, nor is it intended to identify key / important elements or delineate the scope of the embodiments, but to serve as a prelude to the detailed description below.

[0008] The embodiments of the present disclosure provide a defrosting method and device for a multi-split air conditioner, a multi-split air conditioner and a computer readable storage medium, to improve the overall defrosting time of the system.

[0009] In some embodiments, a multi-split air conditioner includes multiple outdoor units connected in parallel, and the rated capacities of the outdoor units are different; the method includes: when the multi-split air conditioner operates in defrost mode, recording the defrost operation parameters of each outdoor unit; the defrost operation parameters include defrost duration and the defrost operation frequency of the compressor; when the defrost duration of one or more outdoor units is greater than the reference duration, upwardly correcting the defrost operation frequency of each target outdoor unit to obtain a target operation frequency; the target outdoor unit is an outdoor unit whose defrost duration is greater than the reference duration; when the multi-split air conditioner operates in defrost mode next time, controlling each target outdoor unit to execute the corresponding target operation frequency.

[0010] Alternatively, the reference duration can be determined by using the shortest defrost duration in each defrost record as the reference duration, or by using the defrost duration of the outdoor unit with the highest rated capacity among multiple outdoor units as the reference duration. By appropriately selecting the reference duration, the defrost frequency of outdoor units with lower rated capacities or longer defrost durations can be increased, thereby ensuring that the defrost duration of all outdoor units is consistent with the reference duration.

[0011] Optionally, the defrost operating frequency of each target outdoor unit is adjusted upward to obtain a target operating frequency, including: adjusting the defrost operating frequency of the target outdoor unit upward based on the defrost operating parameters and rated capacity of the outdoor unit associated with the reference duration and the target outdoor unit; and obtaining the target operating frequency based on the maximum operating frequency of the target outdoor unit and the adjusted defrost operating frequency. In this manner, the defrost operating frequency of the target outdoor unit is adjusted based on the defrost operating parameters of the outdoor unit associated with the reference duration, thereby obtaining a feasible target operating frequency. The target outdoor unit is then defrosted at the target operating frequency during the next defrost operation, thereby shortening the defrost duration. This reduces the difference in defrost duration between the outdoor units within the system and ensures effective defrosting of each outdoor unit.

[0012] Optionally, the defrost operation frequency of the target outdoor unit is modified according to the defrost operation parameters and rated capacities of the outdoor unit to which the reference duration belongs and the target outdoor unit, including:

[0013] Calculate F i =(t i / t s )*(Q s *F s *C i ) / (C s *Q i ); where F i is the corrected operating frequency of the i-th target outdoor unit, F s is the defrost operation frequency of the outdoor unit to which the benchmark duration belongs; t i is the defrost duration of the target outdoor unit i, t s is the benchmark duration; C iC is the displacement of the compressor of the i-th target outdoor unit at this defrosting time s Q is the rated capacity of the outdoor unit of the reference time length s Q is the rated capacity of the outdoor unit of the reference time length i Qi is the rated capacity of the i-th target outdoor unit; i < N, N is the number of outdoor units. In this way, the frequency optimization can be performed on the basis of the original defrosting operation frequency of the target outdoor unit and the defrosting operation parameters of the outdoor unit of the reference time length. Thus, the defrosting time of the target outdoor unit is shortened, the defrosting capacities of the outdoor units in the system are relatively balanced, and the overall defrosting time of the system is further shortened.

[0014] Optionally, the target operation frequency is obtained according to the maximum operation frequency of the target outdoor unit and the corrected operation frequency, including: in the case that the corrected operation frequency is less than the maximum operation frequency of the target outdoor unit, taking the corrected operation frequency as the target operation frequency; in the case that the corrected operation frequency is greater than or equal to the maximum operation frequency of the target outdoor unit, taking the maximum operation frequency of the target outdoor unit as the target operation frequency. In this way, the corrected frequency is compared with the maximum operation frequency of the corresponding target outdoor unit each time the defrosting operation frequency of the outdoor unit is corrected, so as to avoid that the outdoor unit defrosts at a frequency exceeding the maximum operation frequency.

[0015] Optionally, after the control of the execution of the corresponding target operation frequency by each target outdoor unit, the method further includes: recording the defrosting time of each target outdoor unit operating at the corresponding target operation frequency; in the case that the defrosting time corresponding to the target operation frequency is greater than the reference time length, correcting the target operation frequency of the target outdoor unit upward until the latest defrosting time is less than or equal to the reference time length, or the target operation frequency reaches the maximum operation frequency. In this way, the defrosting operation frequency can be corrected multiple times when the corrected defrosting operation frequency does not reach the maximum operation frequency, until the corresponding defrosting time is less than or equal to the reference time length corresponding to the reference outdoor unit. And when the corrected defrosting operation frequency reaches the maximum operation frequency, the correction is stopped. At this time, the defrosting efficiency of the target outdoor unit has reached the maximum, and further increasing the defrosting operation frequency will cause damage to the outdoor unit.

[0016] Optionally, the method further comprises: in the case that the defrosting duration of the one or more outdoor units is less than or equal to the reference duration, saving the defrosting operation frequency of the non-target outdoor unit in this time defrosting; and in the case that the multi-split air conditioner next time runs in the defrosting mode, controlling each target outdoor unit to execute the saved defrosting operation frequency. Here, for the non-target outdoor unit whose defrosting duration is less than or equal to the reference duration, the defrosting operation frequency is not adjusted after this time defrosting, but the defrosting operation frequency of this time defrosting is directly saved. So as to run according to the saved defrosting operation frequency at the next time defrosting. In this way, the defrosting operation frequency of the outdoor unit is dynamically adjusted according to the defrosting condition each time, that is, only the frequency of the target outdoor unit is adjusted. Thus, while ensuring the defrosting effect, the relative balance of the defrosting capacity of each parallel outdoor unit in the system is maintained.

[0017] In some embodiments, the apparatus comprises: a processor and a memory storing program instructions, the processor being configured to execute the defrosting method for a multi-split air conditioner as described above when running the program instructions.

[0018] In some embodiments, the multi-split air conditioner comprises: a plurality of parallel outdoor units, and the rated capacities of the outdoor units are different; and the defrosting apparatus for a multi-split air conditioner as described above is installed in the outdoor units.

[0019] In some embodiments, the computer readable storage medium stores program instructions, the program instructions being used to cause a computer to execute the defrosting method for a multi-split air conditioner as described above when running.

[0020] The defrosting method for a multi-split air conditioner, the defrosting apparatus for a multi-split air conditioner, the multi-split air conditioner and the computer readable storage medium provided by the embodiments of the present disclosure can achieve the following technical effects:

[0021] Based on the reference duration of defrosting, the defrosting frequency of the target outdoor unit whose defrosting duration is greater than the reference duration is corrected. At the next time defrosting, the target outdoor unit is controlled to run according to the improved target operation frequency. In this way, the defrosting duration of each outdoor unit is basically synchronized with the reference duration. Thus, the problem that the overall defrosting time of the multi-split air conditioner system is long due to the fact that the defrosting duration of the outdoor unit with small rated capacity becomes longer as the difference between the rated capacities of the outdoor units is too large is avoided. So as to improve the overall defrosting duration of the system while ensuring the defrosting effect.

[0022] The foregoing general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] One or more embodiments are illustrated by way of example in the figures that are not intended to be limiting of the present embodiments. Like numbers refer to like elements throughout. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. In the drawings:

[0024] Figure 1 is a structural schematic diagram of a multi-split air conditioner provided by an embodiment of the present disclosure;

[0025] Figure 2 is a schematic diagram of a defrosting method for a multi-split air conditioner provided by an embodiment of the present disclosure;

[0026] Figure 3 is a schematic diagram of another defrosting method for a multi-split air conditioner provided by an embodiment of the present disclosure;

[0027] Figure 4 is a schematic diagram of another defrosting method for a multi-split air conditioner provided by an embodiment of the present disclosure;

[0028] Figure 5 is a schematic diagram of another defrosting method for a multi-split air conditioner provided by an embodiment of the present disclosure;

[0029] Figure 6 is a schematic diagram of an application of a defrosting method for a multi-split air conditioner provided by an embodiment of the present disclosure;

[0030] Figure 7 is a schematic diagram of a defrosting device for a multi-split air conditioner provided by an embodiment of the present disclosure;

[0031] Figure 8 is a structural schematic diagram of another multi-split air conditioner provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to illustrate.

[0033] The terms "first", "second", and the like in the description and claims of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0034] Unless otherwise specified, the term "a plurality of" means two or more.

[0035] In the present disclosure, the character " / " in the literal content indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B. The character " / " in the public notice indicates the division sign.

[0036] The term "and / or" is a description of the association between objects, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, the three relationships.

[0037] The term "corresponding" can refer to an association or binding relationship. A and B correspond to each other means that A and B have an association or binding relationship.

[0038] In combination Figure 1 In the present disclosure, the multi-split air conditioner includes a plurality of parallel-connected outdoor units 10 and indoor units 20, and the rated capacities of the outdoor units are different. Among them, the rated capacities of the outdoor units are different means that at least one outdoor unit has a rated capacity different from that of another outdoor unit. The number of outdoor units N≥2, and the number of indoor units is not limited here.

[0039] As an example, the outdoor unit 10 includes four outdoor units, namely outdoor unit a, outdoor unit b, outdoor unit c and outdoor unit d. The rated capacities of the outdoor units from large to small are outdoor unit a, outdoor unit b, outdoor unit c and outdoor unit d, and the rated capacities of outdoor unit a and outdoor unit b are the same.

[0040] In combination Figure 2 As shown, the present disclosure provides a defrosting method for a multi-split air conditioner, comprising:

[0041] S101, in the case of running the defrosting mode of the multi-split air conditioner, the processor records the defrosting running parameters of each outdoor unit; the defrosting running parameters include the defrosting time length and the defrosting running frequency of the compressor.

[0042] S102, in the case that the defrosting time length of one or more outdoor units is greater than the reference time length, the processor corrects the defrosting running frequency of each target outdoor unit upward to obtain a target running frequency; the target outdoor unit is the outdoor unit whose defrosting time length is greater than the reference time length.

[0043] S103, in the case of the next operation of the multi-split air conditioner in the defrosting mode, the processor controls each target outdoor unit to execute the corresponding target operation frequency.

[0044] Here, when the multi-split air conditioner meets the defrosting condition, each outdoor unit operates in the defrosting mode. During operation, each outdoor unit defrosts according to its own default compressor defrosting operation frequency. When the defrosting end condition is met, the outdoor unit exits the defrosting mode. During the defrosting process, because the defrosting operation frequencies of each outdoor unit are different, the defrosting time lengths of each outdoor unit also have certain differences. Therefore, the timing of each outdoor unit exiting the defrosting mode is different. Therefore, the defrosting time length and the defrosting operation frequency of each outdoor unit are recorded each time defrosting is performed.

[0045] After the defrosting of all outdoor units of the multi-split air conditioner is completed, the defrosting time length of each outdoor unit is compared with the reference time length. If the defrosting time length of an outdoor unit is greater than the reference time length, it indicates that the defrosting time length of the outdoor unit is relatively long, which will result in a relatively long overall defrosting time of the system. Therefore, the defrosting operation frequency of the outdoor unit is corrected upward; under the same conditions, the higher the defrosting operation frequency, the faster the defrosting speed, and the shorter the defrosting time length. Correcting the defrosting operation frequency of the target outdoor unit upward can improve the defrosting time length. After the defrosting operation frequency is corrected upward, the target operation frequency is obtained, and then during the next defrosting, the target outdoor unit is controlled to operate according to the target operation frequency, so as to shorten the defrosting time length. The remaining outdoor units whose frequencies are not corrected can defrost according to their own default defrosting operation frequencies. In this way, the defrosting operation frequency of the outdoor unit whose defrosting time length does not meet the condition is optimized and controlled, so as to shorten the defrosting time length of the outdoor unit. Further, the overall defrosting time length of the system is improved, and the heating effect of the system is improved. The reference time length depends on the defrosting time length of each outdoor unit; the reference time length is used as an evaluation reference for the defrosting time length of the multi-split system. As an example, the defrosting time length of any outdoor unit with a medium-to-high rated capacity level is used as the reference time length. As another example, the average value of the defrosting time lengths of all outdoor units is used as the reference time length.

[0046] By using the method for defrosting of the multi-split air conditioner provided in the embodiments of the present disclosure, the defrosting frequency of the target outdoor unit whose defrosting time length is greater than the reference time length is corrected based on the reference defrosting time length. During the next defrosting, the target outdoor unit is controlled to operate according to the improved target operation frequency. In this way, the defrosting time length of each outdoor unit is basically synchronized with the reference time length. Thus, the problem that the overall defrosting time of the multi-split air conditioner system is long due to the large difference in the rated capacity of the outdoor units, which results in a long defrosting time length of the outdoor units with small rated capacity, is avoided. In this way, the overall defrosting time length of the system is effectively improved while ensuring the defrosting effect.

[0047] Optionally, in step S102, the processor determines the reference time length by the following method:

[0048] The processor takes the shortest defrosting duration in each defrosting record as the reference duration, or takes the defrosting duration of the outdoor unit with the largest rated capacity among the multiple outdoor units as the reference duration.

[0049] Here, the reference outdoor unit corresponding to the reference duration can be a certain fixed outdoor unit, or can be dynamically selected. Specifically, the shortest defrosting duration in each defrosting record can be taken as the reference duration. At this time, the reference outdoor unit corresponding to the reference duration is not fixed, and even for outdoor units with the same rated capacity, the defrosting duration fluctuates within a certain range. Therefore, the outdoor unit with the shortest defrosting duration is dynamically selected as the reference standard, and the defrosting operation frequency of the outdoor unit with a longer defrosting duration is adjusted. Alternatively, the defrosting duration of the outdoor unit with the largest rated capacity among the multiple outdoor units can be taken as the reference duration. At this time, the reference outdoor unit corresponding to the reference duration is fixed, and generally, the stronger the rated capacity of the outdoor unit, the higher the defrosting efficiency and the shorter the defrosting duration. Based on the defrosting duration of the outdoor unit with the largest rated capacity, the defrosting operation frequency of the outdoor unit with a longer defrosting duration is adjusted. The rated capacity refers to the rated refrigeration capacity, and the defrosting duration is when the air conditioner is in the cooling mode, so the rated refrigeration capacity is compared. In this way, the defrosting operation frequency of the outdoor unit with a smaller rated capacity or a longer defrosting duration is improved, so that the defrosting duration of each outdoor unit is leveled with the reference duration.

[0050] In addition, in the case that the outdoor unit with the largest rated capacity is not unique, any one of the outdoor units is taken as the reference outdoor unit, and the defrosting duration of the reference outdoor unit is taken as the reference duration. When the defrosting duration of the outdoor unit with the largest rated capacity among the multiple outdoor units is taken as the reference duration, the processor detects the parallel state of each outdoor unit after the multi-split air conditioner is installed and powered on for the first time. In the case that each outdoor unit is in parallel, the outdoor unit with the largest rated capacity is selected as the reference outdoor unit (i.e., the reference outdoor unit).

[0051] In combination Figure 3 As shown in the figure, the embodiment of the present disclosure provides another defrosting method for a multi-split air conditioner, which comprises:

[0052] S101, in the case that the multi-split air conditioner operates in the defrosting mode, the processor records the defrosting operation parameters of each outdoor unit; the defrosting operation parameters include the defrosting duration and the defrosting operation frequency of the compressor.

[0053] S121, in the case that the defrosting duration of one or more outdoor units is greater than the reference duration, the processor corrects upward the defrosting operation frequency of the target outdoor unit according to the defrosting operation parameters and the rated capacity of the reference outdoor unit and the target outdoor unit; the target outdoor unit is the outdoor unit with the defrosting duration greater than the reference duration.

[0054] S122, the processor obtains a target operating frequency according to the maximum operating frequency of the target outdoor unit and the corrected defrost operating frequency.

[0055] S103, in the case of next defrost mode of the multi-connected air conditioner, the processor controls each target outdoor unit to execute the corresponding target operating frequency.

[0056] Here, if the defrosting time of one or more outdoor units is greater than the reference time, the defrosting operating frequency of each target outdoor unit is corrected upward according to the defrosting operating parameters and rated capacity of the outdoor unit as the reference time and the target outdoor unit. Among them, under the same conditions, for outdoor units with different rated capacities, the factors affecting the defrosting rate mainly depend on the defrosting operating parameters (such as the displacement of the compressor, the operating frequency) and the corresponding heat exchanger system. And the rated capacity of the heat exchanger system and the outdoor unit is matched. Therefore, based on the defrosting operating parameters and the rated capacity, the defrosting operating frequency of the target outdoor unit is corrected.

[0057] After correcting the defrosting operating frequency of the target outdoor unit, it is further determined whether the corrected defrosting operating frequency is reasonable. That is, the corrected defrosting operating frequency and the maximum operating frequency of the target outdoor unit are compared; if the corrected defrosting operating frequency does not exceed the corresponding maximum operating frequency, it indicates that the defrosting of the outdoor unit at the corrected defrosting operating frequency will not cause damage. In this way, the feasible target operating frequency is obtained. Further, the target outdoor unit defrosts at the target operating frequency during the next defrosting, thereby shortening the defrosting time. Thus, the defrosting time gap of each outdoor unit in the system is reduced, and the defrosting effect of each outdoor unit is ensured.

[0058] Optionally, in step S121, the processor corrects the defrosting operating frequency of the target outdoor unit upward according to the defrosting operating parameters and rated capacity of the outdoor unit belonging to the reference time and the target outdoor unit, comprising:

[0059] Calculate F i = (t i / t s )*(Q s *F s *C i ) / (C s *Q i ) formula 1

[0060] Wherein, F i is the corrected operating frequency of the i-th target outdoor unit, F s is the defrosting operating frequency of the outdoor unit belonging to the reference time; t i is the defrosting time of the i-th target outdoor unit, t s is the reference time; C i is the displacement of the compressor during the defrosting of the i-th target outdoor unit, C sa displacement of a compressor of the outdoor unit to which the reference time length belongs; Q s a rated capacity of the outdoor unit to which the reference time length belongs; Q i a rated capacity of the ith target outdoor unit; i < N, N is a number of the outdoor units.

[0061] Here, for the target outdoor unit, the defrosting operation parameter includes the displacement of the compressor; for the outdoor unit as the reference time length, the defrosting operation parameter includes the corresponding defrosting operation frequency and the displacement of the compressor. For a single outdoor unit, the defrosting time length is related to the defrosting operation frequency, the capacity value of the outdoor unit and the displacement of the compressor. Among them, the defrosting time length and the defrosting operation frequency, the capacity value of the outdoor unit are positively correlated, and the displacement of the compressor is negatively correlated. Therefore, based on the relationship, the above formula of the two outdoor units about the defrosting time length can be obtained. That is, based on the defrosting time length of the target outdoor unit and the reference time length, and the above parameters, the corrected defrosting operation frequency of the target outdoor unit can be calculated. In the case of multiple target outdoor units, the corresponding corrected defrosting operation frequency is obtained by calculating according to the above formula. In this way, the frequency optimization can be carried out on the basis of the original defrosting operation frequency of the target outdoor unit and the defrosting operation parameters of the reference time length outdoor unit. Thus, the defrosting time length of the target outdoor unit is shortened, the defrosting capacity of each outdoor unit in the system is relatively balanced, and the overall defrosting time length of the system is further shortened.

[0062] Optionally, S122, the processor obtains a target operation frequency according to the maximum operation frequency of the target outdoor unit and the corrected defrosting operation frequency, including:

[0063] In the case that the corrected operation frequency is less than the maximum operation frequency of the target outdoor unit, the processor takes the corrected operation frequency as the target operation frequency.

[0064] In the case that the corrected operation frequency is greater than or equal to the maximum operation frequency of the target outdoor unit, the processor takes the maximum operation frequency of the target outdoor unit as the target operation frequency.

[0065] Here, the corrected defrosting operation frequency is calculated based on the above formula. In the calculation process, the frequency upper limit value of the outdoor unit with smaller rated capacity is not considered. In order to ensure the performance and service life of the outdoor unit, each outdoor unit is provided with an allowed maximum operation frequency. If the operation frequency exceeds the maximum operation frequency, the compressor will be damaged or the performance of the compressor will be affected. Therefore, when the defrosting operation frequency of the outdoor unit is corrected each time, the corrected frequency needs to be compared with the maximum operation frequency of the corresponding target outdoor unit to avoid the outdoor unit defrosting at a frequency exceeding the maximum operation frequency.

[0066] In combination with Figure 4 As shown in FIG. 8, the embodiment of the present disclosure provides another defrosting method for a multi-split air conditioner, including:

[0067] S101, in the case of the operation of the defrosting mode of the multi-split air conditioner, the processor records the defrosting operation parameters of each outdoor unit; the defrosting operation parameters include the defrosting time length and the defrosting operation frequency of the compressor.

[0068] S102, in the case that the defrosting time length of one or more outdoor units is greater than the reference time length, the processor corrects upward the defrosting operation frequency of each target outdoor unit to obtain a target operation frequency; the target outdoor unit is the outdoor unit whose defrosting time length is greater than the reference time length.

[0069] S103, in the case of the next operation of the defrosting mode of the multi-split air conditioner, the processor controls each target outdoor unit to execute the corresponding target operation frequency.

[0070] S204, record the defrosting time length of each target outdoor unit under the corresponding target operation frequency.

[0071] S205, in the case that the defrosting time length corresponding to the target operation frequency is greater than the reference time length, the processor corrects the target operation frequency of the target outdoor unit again until the latest defrosting time length is less than or equal to the reference time length, or the latest target operation frequency reaches the maximum operation frequency.

[0072] Here, after correcting the defrosting operation frequency of the target outdoor unit, the defrosting time length of the target outdoor unit under the target operation frequency is recorded next time. If the defrosting time length of the target outdoor unit this time is still greater than the reference time length of this time, it indicates that the defrosting time length of the target outdoor unit is still longer, and needs to be further corrected. Therefore, the target operation frequency is corrected based on the above formula and the operation parameters of this time defrosting, etc.; until the latest defrosting time length is less than or equal to the reference time length, or the latest target operation frequency after correction reaches the maximum operation frequency. In this way, when the corrected defrosting operation frequency does not reach the maximum operation frequency, the defrosting operation frequency can be corrected multiple times until the corresponding defrosting time length is less than or equal to the reference time length corresponding to the reference outdoor unit. And when the corrected defrosting operation frequency reaches the maximum operation frequency, the correction is stopped. At this time, the defrosting efficiency of the target outdoor unit has reached the maximum, and further increasing the defrosting operation frequency will cause damage to the outdoor unit. In this way, the defrosting time length of each target outdoor unit is made to reach the reference time length as much as possible, and the efficient synchronization of the defrosting of the multi-split unit is ensured.

[0073] In combination with Figure 5 The embodiment of the present disclosure provides another defrosting method for a multi-split air conditioner, which comprises:

[0074] S101, in the case of the operation of the defrosting mode of the multi-split air conditioner, the processor records the defrosting operation parameters of each outdoor unit; the defrosting operation parameters include the defrosting time length and the defrosting operation frequency of the compressor.

[0075] S102, in the case that the defrosting time length of one or more outdoor units is greater than the reference time length, the processor corrects upward the defrosting operation frequency of each target outdoor unit to obtain a target operation frequency; the target outdoor unit is the outdoor unit whose defrosting time length is greater than the reference time length.

[0076] S103, in the case that the multi-split air conditioner next time runs the defrosting mode, the processor controls each target outdoor unit to execute the corresponding target operation frequency.

[0077] S304, in the case that the defrosting time length of one or more outdoor units is less than or equal to the reference time length, the processor saves the defrosting operation frequency of the non-target outdoor unit this time.

[0078] S305, in the case that the multi-split air conditioner next time runs the defrosting mode, the processor controls each target outdoor unit to execute the saved defrosting operation frequency.

[0079] Here, in the case that the defrosting time length of certain or some outdoor units is less than or equal to the reference time length, the defrosting operation frequency of these outdoor units is not adjusted after this time defrosting, and the defrosting operation frequency of this time defrosting is saved. In the next time defrosting, the saved defrosting operation frequency is executed. In the subsequent defrosting process, if the defrosting time length is greater than the reference time length, the correction is performed again. That is, the defrosting operation frequency of the outdoor unit is dynamically adjusted according to each time defrosting. Thus, the defrosting effect is ensured, and the relative balance of the defrosting capacity of each parallel outdoor unit in the system is maintained.

[0080] As an example, as shown in Figure 6 , the outdoor unit includes four outdoor units, namely outdoor unit a, outdoor unit b, outdoor unit c and outdoor unit d. It is assumed that the rated capacity of outdoor unit a is the largest and it is taken as the reference outdoor unit, and it is assumed that the defrosting operation frequency of outdoor unit b needs to be corrected, and the defrosting process is as shown in Figure 6 .

[0081] S401, the multi-split air conditioner is powered on for the first time;

[0082] S402, the state of each outdoor unit is detected, and when the outdoor units are in parallel, the outdoor unit a with the largest rated capacity is taken as the reference outdoor unit;

[0083] S403, in the case that the multi-split air conditioner meets the defrosting condition, each outdoor unit runs according to the default defrosting operation frequency thereof, and the defrosting time length of each outdoor unit running to the exit of the defrosting mode is recorded;

[0084] S404, it is judged whether the defrosting time lengths tbi, tci and tdi of outdoor units b to d are all less than or equal to the reference time length tai of outdoor unit a; if yes, S405 is executed; if no, S406 is executed; (here, the multi-split air conditioner executes the defrosting mode for the first time, so i=1; i represents the defrosting number)

[0085] S405, save the default defrosting operation frequency Fa, Fb, Fc, Fd of each outdoor unit, and defrost according to the default defrosting operation frequency next time;

[0086] S406, in the case that tbi>tai, and tci, tdi are all less than or equal to tai, obtain the corrected Fb' by using formula 1;

[0087] S407, judge whether Fb'≤Fbmax, if yes, execute S408; if no, execute S411; wherein Fbmax is the maximum operation frequency allowed by the compressor of outdoor unit b;

[0088] S408, save Fb' and Fa, Fc, Fd, and defrost according to the saved defrosting operation frequency next time;

[0089] S409, run the defrosting mode again, each outdoor unit runs according to the corresponding frequency Fb' and Fa, Fc, Fd, and record the defrosting time tai, tbi, tci, tdi (here, i=2 in the second defrosting, the defrosting time of each outdoor unit is ta2, tb2, tc2, td2 respectively, and the same for the third defrosting and so on);

[0090] S410, judge whether tbi>tai (here, it is assumed that tci, tdi are all less than tai); if yes, execute S406; if no, execute S408;

[0091] S411, save Fbmax and Fa, Fc, Fd, and defrost according to the saved defrosting operation frequency next time.

[0092] In the above example, only the defrosting operation frequency of outdoor unit b needs to be corrected. In actual application, the outdoor units whose defrosting operation frequency needs to be corrected can be judged according to the foregoing scheme.

[0093] In combination with Figure 7 As shown in the figure, the embodiment of the present disclosure provides a defrosting device 100 for a multi-split air conditioner, which comprises a processor 101 and a memory 102. Optionally, the device 100 can further comprise a communication interface 103 and a bus 104. Wherein the processor 101, the communication interface 103, and the memory 102 can complete the communication among each other through the bus 104. The communication interface 103 can be used for information transmission. The processor 101 can call the logical instructions in the memory 102 to execute the defrosting method for a multi-split air conditioner of the above-mentioned embodiment.

[0094] In addition, the logic instructions in the memory 102 described above can be implemented in the form of a software function unit and sold or used as an independent product, which can be stored in a computer readable storage medium.

[0095] The memory 102 as a computer readable storage medium can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiments of the present disclosure. The processor 101 executes the program instructions / modules stored in the memory 102, thereby performing functional applications and data processing, that is, implementing the defrosting method for the multi-split air conditioner in the above embodiments.

[0096] The memory 102 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 102 can include a high-speed random access memory, and can also include a non-volatile memory.

[0097] In combination Figure 8 As shown in the figure, the embodiments of the present disclosure provide a multi-split air conditioner 200, which includes a plurality of parallel-connected outdoor units 10 and indoor units 20, and the rated capacities of the outdoor units are different, and the defrosting device 100 for the multi-split air conditioner described above. The defrosting device 100 for the multi-split air conditioner is installed in the outdoor unit 10. The installation relationship described herein is not limited to being placed in the interior of the outdoor unit, but also includes installation connection with other components of the multi-split air conditioner 100, including but not limited to physical connection, electrical connection or signal transmission connection, etc. Those skilled in the art can understand that the defrosting device 200 for the multi-split air conditioner can be adapted to a feasible main body, thereby realizing other feasible embodiments.

[0098] The embodiments of the present disclosure provide a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are set to execute the defrosting method for the multi-split air conditioner described above.

[0099] The technical solutions of the embodiments of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc. various media that can store program codes.

[0100] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variations "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups of these. In the absence of further restrictions, an element defined by the sentence "comprising a..." does not exclude the presence of other identical elements in the process, method or device that includes the element. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments can be referenced to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can be found in the description of the method part.

[0101] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technicians will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0102] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to apparatuses, devices, etc.), can be implemented in other manners. For example, the described apparatus embodiments can be implemented only in a form of a logical function, and can be implemented by using a manner such as software (for example, application program) or the like. In some embodiments, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or indirect coupling between different units, or the coupling or direct coupling or indirect coupling between the displayed or discussed communication connections can be in a form of electrical, mechanical or other forms.

[0103] The flowcharts and block diagrams in the drawings show the possible implementation architectures, functions and operations of the system, method and computer program product according to the embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment or a part of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks can occur in an order different from that noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the drawings, the operations or steps corresponding to different blocks can also occur in an order different from that disclosed in the descriptions, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. Each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A defrosting method for a multi-split air conditioner, characterized in that, The multi-connected air conditioner comprises a plurality of outdoor units connected in parallel, and the outdoor units have different rated capacities; the method comprises the following steps: In the case that the multi-connected air conditioner is running in the defrosting mode, the defrosting operation parameters of each outdoor unit are recorded; the defrosting operation parameters comprise the defrosting time length and the defrosting operation frequency of the compressor; In the case that the defrosting time length of one or more outdoor units is greater than the reference time length, the defrosting operation frequency of each target outdoor unit is corrected upward to obtain a target operation frequency; the target outdoor unit is the outdoor unit whose defrosting time length is greater than the reference time length; In the case that the multi-connected air conditioner is running in the defrosting mode next time, each target outdoor unit is controlled to execute the corresponding target operation frequency.

2. The method of claim 1, wherein, The reference time length is determined in the following ways: The shortest defrosting time length in each defrosting record is taken as the reference time length; or The defrosting time length of the outdoor unit with the largest rated capacity among the plurality of outdoor units is taken as the reference time length.

3. The method of claim 1, wherein, The defrosting operation frequency of each target outdoor unit is corrected upward to obtain a target operation frequency, which comprises the following steps: According to the defrosting operation parameters and the rated capacities of the outdoor unit to which the reference time length belongs and the target outdoor unit, the defrosting operation frequency of the target outdoor unit is corrected upward; According to the maximum operation frequency of the target outdoor unit and the corrected defrosting operation frequency, the target operation frequency is obtained.

4. The method of claim 3, wherein, According to the defrosting operation parameters and the rated capacities of the outdoor unit to which the reference time length belongs and the target outdoor unit, the defrosting operation frequency of the target outdoor unit is corrected, which comprises the following steps: Compute F i = (t i / t s )*(Q s *F s *C i ) / (C s *Q i ) F i is the corrected operating frequency of the ith target outdoor unit, F s is the defrosting operating frequency of the outdoor unit to which the reference time length belongs; t i is the defrosting time of the ith target outdoor unit this time, t s is the reference time length; C i is the displacement of the compressor of the ith target outdoor unit at this time of defrosting, C s is the displacement of the compressor of the outdoor unit to which the reference time length belongs at this time of defrosting; Q s is the rated capacity of the outdoor unit to which the reference time length belongs, Q i is the rated capacity of the ith target outdoor unit; i < N, and N is the number of outdoor units.

5. The method of claim 3, wherein, According to the maximum operation frequency of the target outdoor unit and the corrected operation frequency, the target operation frequency is obtained, which comprises the following steps: In the case that the corrected operation frequency is less than the maximum operation frequency of the target outdoor unit, the corrected operation frequency is taken as the target operation frequency; In the case that the corrected operation frequency is greater than or equal to the maximum operation frequency of the target outdoor unit, the maximum operation frequency of the target outdoor unit is taken as the target operation frequency.

6. The method according to any one of claims 1 to 5, characterized in that, After each target outdoor unit is controlled to execute the corresponding target operation frequency, the following steps are further included: The defrosting time length of each target outdoor unit running at the corresponding target operation frequency is recorded; In the case that the defrosting time length corresponding to the target operation frequency is greater than the reference time length, the target operation frequency of the target outdoor unit is corrected upward until the latest defrosting time length is less than or equal to the reference time length or the target operation frequency reaches the maximum operation frequency.

7. The method according to any one of claims 1 to 5, characterized in that, The method further comprises the following steps: In the case that the defrosting time length of one or more outdoor units is less than or equal to the reference time length, the defrosting operation frequency of the non-target outdoor unit in this defrosting is saved; and In the case that the multi-connected air conditioner is running in the defrosting mode next time, each target outdoor unit is controlled to execute the saved defrosting operation frequency.

8. A defrosting device for a multi-split air conditioner, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the defrosting method for the multi-connected air conditioner according to any one of claims 1 to 7 when the program instructions are run.

9. A multi-split air conditioner, characterized in that, It comprises the following parts: A plurality of outdoor units connected in parallel, and the outdoor units have different rated capacities; The defrosting device for the multi-connected air conditioner according to claim 8 is installed in the outdoor units.

10. A computer-readable storage medium storing program instructions, characterized in that: The program instructions are used to make the computer execute the defrosting method for the multi-connected air conditioner according to any one of claims 1 to 7 when the program instructions are run.

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