Defrosting control method of air conditioning system and air conditioning system

Abstract

The present application relates to the technical field of air conditioners, and specifically provides a defrosting control method of an air conditioning system and the air conditioning system. The present application aims to solve the problem that the existing air conditioner shortens the service life of the compressor and affects the user experience due to the start and stop of the compressor during the defrosting process. To this end, the defrosting control method of the air conditioner system of the present application comprises: acquiring the outer disc temperature of the outdoor heat exchanger in real time during the execution of the heating mode, denoted as the first temperature; comparing the first temperature with the first preset temperature; selectively executing the non-stop defrosting mode according to the comparison result; the non-stop defrosting mode comprises cyclically executing the first defrosting mode and the second defrosting mode until the defrosting is completed. In the defrosting process, the defrosting control method of the present application does not need to start and stop the compressor, can work continuously, does not need to change the flow direction of the refrigerant, and at the same time, the indoor heat exchanger does not cool and heats uninterruptedly, which can effectively improve the user experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and particularly provides a defrosting control method of an air conditioning system and the air conditioning system. BACKGROUND

[0002] When the air conditioner is heating, the low-temperature refrigerant flows to the outdoor heat exchanger, resulting in frosting of the outdoor heat exchanger. Generally, the air conditioner needs to shut down the compressor and switch the four-way valve flow direction to remove the frost by transferring the hot refrigerant into the outdoor heat exchanger. However, this operation needs to shut down the compressor, and the compressor consumes a large amount of energy during the start-stop process, which is about five to six times of the normal operation. At the same time, frequent start-stop of the compressor will affect the service life of the compressor. In addition, the indoor heat exchanger does not heat during the defrosting stage, which affects the user experience.

[0003] Correspondingly, there is a need in the art for a new technical solution to solve the above technical problems. SUMMARY

[0004] The present application aims to solve the above technical problems, i.e., to solve the problem of shortening the service life of the compressor due to start-stop of the compressor during the defrosting process of the existing air conditioner and the problem of affecting the user experience due to the fact that the indoor heat exchanger does not heat during the defrosting process.

[0005] In a first aspect, the present application provides a defrosting control method of an air conditioning system, the air conditioning system comprising a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a first throttling valve and a second throttling valve, wherein a first end of the indoor heat exchanger is communicated with the compressor through the four-way valve, a second end of the indoor heat exchanger is communicated with a first end of the outdoor heat exchanger through the first throttling valve, a second end of the outdoor heat exchanger is communicated with the compressor through the four-way valve, and the second throttling valve is arranged between the second end of the outdoor heat exchanger and the four-way valve; the defrosting control method comprises: acquiring an outdoor coil temperature of the outdoor heat exchanger in real time during execution of a heating mode, denoted as a first temperature; comparing the first temperature with a first preset temperature; and selectively executing a non-stop defrosting mode according to a comparison result; the non-stop defrosting mode comprises cyclically executing a first defrosting mode and a second defrosting mode until defrosting is completed; wherein the first defrosting mode is to operate according to a first defrosting operation for a first preset time, in the first defrosting operation, the compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger continue to operate according to state parameters in the heating mode before defrosting, the first throttling valve is kept fully open and the second throttling valve is kept fully closed; and the second defrosting mode is to operate according to a second defrosting operation for a second preset time, in the second defrosting mode, the compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger continue to operate according to the state parameters in the heating mode before defrosting, the first throttling valve is kept at an opening degree in the heating mode before defrosting and the second throttling valve is kept fully open.

[0006] In the preferred technical scheme of the defrosting control method of the air conditioning system, the step of selectively executing the non-stop defrosting mode according to the comparison result specifically comprises: if the first temperature is greater than the first preset temperature, the non-stop defrosting mode is not executed; and if the first temperature is not greater than the first preset temperature, the non-stop defrosting mode is executed.

[0007] In the preferred technical scheme of the defrosting control method of the air conditioning system, before the execution of the non-stop defrosting mode, the defrosting control method further comprises: obtaining a cycle period of the last execution of the non-stop defrosting mode, denoted as a last cycle period; wherein the cycle period is the cycle number of cyclically executing the first defrosting mode and the second defrosting mode; in the case of obtaining the last cycle period, obtaining a continuous defrosting number of executing the non-stop defrosting mode with the last cycle period; judging whether the continuous defrosting number is less than 3; if the judgment result is "yes", determining the last cycle period as a target cycle period, and then executing the non-stop defrosting mode this time with the target cycle period; if the judgment result is "no", determining a target cycle period according to a cycle period determination method, and then executing the non-stop defrosting mode this time with the target cycle period.

[0008] In the preferred technical scheme of the defrosting control method of the air conditioning system, the step of "determining a target cycle period according to a cycle period determination method" specifically comprises: judging whether the continuous defrosting number is less than 4; if the judgment result is "yes", determining the target cycle period by a first determination method; if the judgment result is "no", determining the target cycle period by a second determination method.

[0009] In the preferred technical scheme of the defrosting control method of the air conditioning system, the step of "determining the target cycle period by the first determination method" specifically comprises: obtaining the operation time of the heating mode between the execution of the non-stop defrosting mode for two adjacent times in the last three times of executing the non-stop defrosting mode, respectively denoted as T 11 and T 12 , wherein T 12 is the operation time of the heating mode before the last execution of the non-stop defrosting mode, and T 11 is the operation time of the heating mode before the execution of the non-stop defrosting mode for two adjacent times in the last three times of executing the non-stop defrosting mode; according to T 11 and T 12 , selectively determining the last cycle period as the target cycle period.

[0010] In the preferred technical scheme of the defrosting control method of the air conditioning system, the step of "selectively determining the last cycle period as the target cycle period according to T 11 and T 12 " specifically comprises: calculating the difference between T 12 and T 11 , denoted as ΔT1, wherein ΔT1=T 12 -T 11comparing an absolute value |ΔT1| of ΔT1 with a first preset difference value; if |ΔT1| is not greater than the first preset difference value, determining the last cycle period as the target cycle period; if |ΔT1| is greater than the first preset difference value, judging whether ΔT1 is greater than 0; if ΔT1 is greater than 0, reducing one cycle from the last cycle period and determining the cycle as the target cycle period; if ΔT1 is not greater than 0, adding one cycle to the last cycle period and determining the cycle as the target cycle period.

[0011] In the preferred technical scheme of the defrosting control method of the air conditioning system, the step of determining the target cycle period by the second determining method comprises: obtaining running time of the heating mode between two adjacent times of executing the non-stop defrosting mode in the first four times of executing the non-stop defrosting mode, and denoting the running time as T 21 , T 22 and T 23 respectively, wherein T 23 is running time of the heating mode before the last time of executing the non-stop defrosting mode, T 22 is running time of the heating mode before the time before the last time of executing the non-stop defrosting mode, and T 21 is running time of the heating mode before the time before the time before the last time of executing the non-stop defrosting mode; and selectively determining the last cycle period as the target cycle period according to T 21 , T 22 and T 23 .

[0012] In the preferred technical scheme of the defrosting control method of the air conditioning system, the step of selectively determining the last cycle period as the target cycle period according to T 21 , T 22 and T 23 comprises: comparing T 23 with T 22 ; if T 23 is less than T 22 , judging whether T 22 is less than T 21 ; if T 22 is less than T 21 , calculating a difference value ΔT2 of T 21 and T 23 , ΔT2=T 21 -T 23; if the ΔT2 is greater than the second preset difference value, then one cycle is added to the last cycle period and the cycle is determined as the target cycle period; if T 22 is not less than T 21 , then the last cycle period is determined as the target cycle period; if T 23 is equal to T 22 , then the last cycle period is determined as the target cycle period; if T 23 is greater than T 22 , then it is judged whether T 22 is greater than T 21 ; if T 22 is greater than T 21 , then a difference value ΔT3 between T 23 and T 21 is calculated, ΔT3 = T 23 -T 21 ; the ΔT3 is compared with the second preset difference value; if the ΔT3 is not greater than the second preset difference value, then the last cycle period is determined as the target cycle period; if the ΔT3 is greater than the second preset difference value, then one cycle is subtracted from the last cycle period and the cycle is determined as the target cycle period; if T 22 is not less than T 21 , then the last cycle period is determined as the target cycle period.

[0013] In the preferred technical scheme of the defrosting control method of the air conditioning system, before the non-stop defrosting mode is executed, the defrosting control method further comprises: in the case that the last cycle period is not acquired, directly executing the non-stop defrosting mode; in the non-stop defrosting mode, acquiring an outdoor heat exchanger outer disc temperature in real time, denoted as a second temperature; comparing the second temperature with a second preset temperature; and selectively stopping the execution of the non-stop defrosting mode according to the comparison result.

[0014] In the preferred technical scheme of the defrosting control method of the air conditioning system, the step of "selectively stopping the execution of the non-stop defrosting mode according to the comparison result" specifically comprises: if the second temperature is greater than the second preset temperature, then the execution of the non-stop defrosting mode is stopped; and if the second temperature is not greater than the second preset temperature, then the execution of the non-stop defrosting mode is not stopped.

[0015] In the preferred technical scheme of the defrosting control method of the air conditioning system, in the case of obtaining the last cycle period, and before executing the non-stop defrosting mode, the defrosting control method further comprises: judging whether the determined target cycle period is greater than a limit cycle period; if the target cycle period is greater than the limit cycle period, the non-stop defrosting mode is not executed, and a normal defrosting mode is executed; if the target cycle period is not greater than the limit cycle period, the non-stop defrosting mode is executed according to the target cycle period; wherein the normal defrosting mode is to restart the compressor and make the four-way valve reverse, so that the air conditioning system operates in the refrigeration mode, while the second throttling valve keeps fully open.

[0016] In the preferred technical scheme of the defrosting control method of the air conditioning system, the first preset time is 30s-60s; and / or, the second preset time is 30s-60s.

[0017] In the second aspect, the present application provides an air conditioning system, which comprises a controller configured to be capable of executing the defrosting control method of the air conditioning system described above.

[0018] In the case of adopting the above technical solutions, the air conditioning system of the present application adds a second throttling valve between the outdoor heat exchanger and the four-way valve, so that during the defrosting phase, the opening degree of the first throttling valve and the second throttling valve can be regulated to realize non-stop defrosting, and the circulating direction of the refrigerant does not need to be changed during the defrosting process; the defrosting control method of the present application executes the non-stop defrosting mode when defrosting is needed, wherein the non-stop defrosting mode cyclically executes the first defrosting mode and the second defrosting mode, the first defrosting mode is to run for a first preset time according to a first defrosting operation, the first defrosting operation is to make the compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger continue to run according to the state parameters in the heating mode before defrosting, the first throttling valve remains fully open and the second throttling valve remains fully closed; the second defrosting mode is to run for a second preset time according to a second defrosting operation, the second defrosting operation is to make the compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger continue to run according to the state parameters in the heating mode before defrosting, the first throttling valve remains at the opening degree in the heating mode before defrosting and the second throttling valve remains fully open; such a setting mode cyclically executes the first defrosting mode and the second defrosting mode during the defrosting process, during the execution of the first defrosting mode, the high-temperature refrigerant is transported from the indoor heat exchanger to the outdoor heat exchanger, and the high-temperature refrigerant is heat-exchanged at the outdoor heat exchanger, thereby defrosting the frost on the outdoor heat exchanger, at the same time, the second throttling valve is fully closed to disconnect the passage between the outdoor heat exchanger and the compressor, and after the continuous defrosting for the first preset time, the second defrosting mode is executed, i.e. normal heating is performed, which is to make the refrigerant in the circulating loop flow again, increase the exhaust temperature, and after running for the second preset time, the first defrosting mode is executed again to defrost the frost on the outdoor heat exchanger again, and the first defrosting mode and the second defrosting mode are cyclically executed until the defrosting is completed; during the defrosting process, the compressor does not need to be started and stopped, and can work continuously, and the circulating direction of the refrigerant does not need to be changed, at the same time, the indoor heat exchanger does not need to be cooled and heated continuously, which can effectively improve the user experience, in addition, the circulating line of the air conditioning system does not need to be changed, only one throttling valve needs to be added to realize the regulation, which is low in cost and convenient to use.

[0019] Further, before executing the non-stop defrosting mode, the defrosting control method further comprises: obtaining a cycle period of a previous execution of the non-stop defrosting mode, denoted as a last cycle period; in the case of obtaining the last cycle period, obtaining a continuous defrosting number of the non-stop defrosting mode executed in the last cycle period; judging whether the continuous defrosting number is less than 3; if the result of the judgment is "yes", determining the last cycle period as a target cycle period, and then executing the non-stop defrosting mode in the target cycle period; if the result of the judgment is "no", determining the target cycle period according to the cycle period determination method, and then executing the non-stop defrosting mode in the target cycle period; in this way, the cycle period of the previous execution of the non-stop defrosting mode is obtained first, and the continuous defrosting number of the non-stop defrosting mode executed in the last cycle period is obtained, and the continuous defrosting number is compared with 3, so as to determine the target cycle period of the execution of the non-stop defrosting mode according to the comparison result, so as to end the defrosting operation more quickly and facilitate use.

[0020] Further, the step of "determining the target cycle period according to the cycle period determination method" specifically comprises: judging whether the continuous defrosting number is less than 4, and determining whether the first determination method or the second determination method is used to determine the target cycle period according to the judgment result, so as to make the finally determined cycle period adapt to the current situation and ensure the defrosting effect. BRIEF DESCRIPTION OF DRAWINGS

[0021] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0022] Figure 1 is a structural schematic diagram of the air conditioning system of the present application;

[0023] Figure 2 is a flow chart of the main steps of the defrosting control method of the air conditioning system of the present application;

[0024] Figure 3 is a flow chart of the first embodiment of the defrosting control method of the air conditioning system of the present application;

[0025] Figure 4 is a flow chart of the second embodiment of the defrosting control method of the air conditioning system of the present application;

[0026] Figure 5 is a flow chart of the third embodiment of the defrosting control method of the air conditioning system of the present application;

[0027] Figure 6 is a flow chart of the "first determination method" in the defrosting control method of the air conditioning system of the present application;

[0028] Figure 7 is a flow chart of the "second determination method" in the defrosting control method of the air conditioning system of the present application.

[0029] List of reference signs:

[0030] 1 compressor; 2 four-way valve; 3 indoor heat exchanger; 4 outdoor heat exchanger; 5 first throttling valve; 6 second throttling valve. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the embodiments are only used to explain the technical principles of the present application, and are not intended to limit the scope of protection of the present application.

[0032] It should be noted that in the description of the present application, the terms "first", "second" are only used for the purpose of description, and should not be understood as indicating or implying relative importance.

[0033] In addition, it should also be noted that in the description of the present application, unless otherwise specified and limited, the terms "set", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be directly connected, or it can be indirectly connected through other components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Based on the problems of shortening the service life of the compressor due to the start-stop of the compressor during the defrosting process of the existing air conditioner and affecting the user experience due to the indoor heat exchanger not heating during the defrosting process as pointed out in the background art. The air conditioning system of the present application adds a second throttling valve between the outdoor heat exchanger and the four-way valve, so that during the defrosting stage, by adjusting the opening degree of the first throttling valve and the second throttling valve, non-stop defrosting can be realized, and the circulating direction of the refrigerant does not need to be changed during the defrosting process; the defrosting control method of the air conditioning system of the present application circulates the first defrosting mode and the second defrosting mode during the defrosting process, during the operation of the first defrosting mode, the high-temperature refrigerant is transported from the indoor heat exchanger to the outdoor heat exchanger, and the high-temperature refrigerant is heat-exchanged at the outdoor heat exchanger, thereby defrosting the outdoor heat exchanger, and at the same time, the second throttling valve is fully closed to disconnect the passage between the outdoor heat exchanger and the compressor, and the defrosting continues for a first preset time, then the second defrosting mode is executed, that is, normal heating is performed, this process is to make the refrigerant in the circulating loop flow, increase the exhaust temperature, and after a second preset time, the first defrosting mode is executed again to defrost the frost on the outdoor heat exchanger again, and the first defrosting mode and the second defrosting mode are circulated until the defrosting is completed; this non-stop defrosting mode does not need to start and stop the compressor during the defrosting process, and the compressor can work continuously without changing the flow direction of the refrigerant, and at the same time, the indoor heat exchanger does not cool and heats continuously, which can effectively improve the user experience, in addition, it does not need to change the circulating line of the air conditioning system, only needs to add a throttling valve to realize adjustment, low cost, convenient to use, and effectively guarantees the service life of the compressor.

[0035] Specifically, referring to Figure 1 , the air conditioning system of the present application comprises a compressor 1, a four-way valve 2, an indoor heat exchanger 3, an outdoor heat exchanger 4, a first throttling valve 5 and a second throttling valve 6 forming a circulating loop.

[0036] Among them, the first end of the indoor heat exchanger 3 communicates with the compressor 1 through the four-way valve 2, the second end of the indoor heat exchanger 3 communicates with the first end of the outdoor heat exchanger 4 through the first throttling valve 5, the second end of the outdoor heat exchanger 4 communicates with the compressor 1 through the four-way valve 2, and the second throttling valve 6 is arranged between the second end of the outdoor heat exchanger 4 and the four-way valve 2.

[0037] In addition, the air conditioning system of the present application further comprises a controller configured to execute the defrosting control method of the present application.

[0038] Specifically, referring to Figure 2 , the defrosting control method of the air conditioning system of the present application comprises the following steps:

[0039] S1: acquiring the outdoor heat exchanger temperature in real time during the execution of the heating mode, denoted as the first temperature.

[0040] In the heating mode, the outdoor heat exchanger performs heat exchange in real time, the temperature of the outer plate thereof decreases and frost is formed, so the temperature of the outer plate of the outdoor heat exchanger is obtained in real time and recorded as a first temperature, so as to determine whether defrosting operation is needed according to the first temperature.

[0041] Exemplarily, the outdoor heat exchanger is provided with a temperature sensor capable of detecting the temperature of the outer plate of the outdoor heat exchanger.

[0042] S2: comparing the first temperature with a first preset temperature.

[0043] The first preset temperature is the temperature of the outer plate of the outdoor heat exchanger when the frost formation is relatively serious and defrosting is needed, and the specific value thereof can be set according to actual needs.

[0044] The first temperature is compared with the first preset temperature, and then it is determined whether defrosting is needed according to the comparison result.

[0045] S3: selectively performing a non-stop defrosting mode according to the comparison result.

[0046] The non-stop defrosting mode includes cyclically performing a first defrosting mode and a second defrosting mode until defrosting is completed. In the first defrosting mode, the compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger continue to operate according to the state parameters in the heating mode before defrosting, the first throttling valve is kept fully open and the second throttling valve is kept fully closed. The first throttling valve is fully open and does not throttle, so that the refrigerant flowing into the outdoor heat exchanger is kept in a high-temperature state, thereby enabling heat exchange at the outdoor heat exchanger to defrost the frost outside the outer plate of the outdoor heat exchanger, and the second throttling valve is kept fully closed, thereby cutting off the passage between the outdoor heat exchanger and the compressor to avoid liquid refrigerant generated in the defrosting stage from entering the compressor and damaging the compressor.

[0047] In the second defrosting mode, the compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger continue to operate according to the state parameters in the heating mode before defrosting, the first throttling valve is kept at the opening degree in the heating mode before defrosting, and the second throttling valve is kept fully open. The first throttling valve restores the throttling opening degree in the heating mode, and the second throttling valve is fully open, so that the refrigerant flows again. Firstly, the indoor heat exchanger continues to heat to ensure the temperature in the room, and secondly, the exhaust temperature of the indoor heat exchanger is increased, so as to perform the first defrosting mode again to defrost the outer plate again. After flowing again, since the first preset time is relatively short, the liquid refrigerant of the outdoor heat exchanger is less, which enters the liquid storage tank before returning to the compressor, so as not to damage the compressor.

[0048] The defrosting control method of the present application cyclically executes the first defrosting mode and the second defrosting mode during the defrosting process. During the execution of the first defrosting mode, the high-temperature refrigerant is directly delivered from the indoor heat exchanger to the outdoor heat exchanger, and the high-temperature refrigerant is subjected to heat exchange at the outdoor heat exchanger, thereby defrosting the frost on the outdoor heat exchanger. At the same time, the second throttling valve is fully closed to disconnect the passage between the outdoor heat exchanger and the compressor, and the defrosting is continuously performed for a first preset time. Then, the second defrosting mode is executed, that is, normal heating is performed. This process is to make the refrigerant in the circulating loop flow, increase the exhaust temperature, and execute the first defrosting mode again after a second preset time. The frost on the outdoor heat exchanger is defrosted again. The first defrosting mode and the second defrosting mode are cyclically executed until the defrosting is completed. The non-stop defrosting mode can continuously work without starting and stopping the compressor during the defrosting process, and does not need to change the flow direction of the refrigerant. At the same time, the indoor heat exchanger does not cool and continuously heats, which can effectively improve the user experience. In addition, the circulating line of the air conditioning system does not need to be changed, and only one throttling valve needs to be added to realize the adjustment, which is low in cost and convenient to use, and effectively ensures the service life of the compressor.

[0049] In addition, in the non-stop defrosting mode, the operating parameters and states of the compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger are the same as those in the heating mode. Only by adjusting the opening degrees of the first throttling valve and the second throttling valve can the non-stop defrosting be realized, which is simple to control and convenient to use.

[0050] It should be noted that during the execution of the heating mode, the first throttling valve is kept in the throttling state, and the second throttling valve is fully opened. When the throttling valve is fully opened, there is no throttling effect, and no throttling is performed. When the throttling valve is fully closed, the pipeline is blocked. The throttling valve only plays a throttling role in the throttling state.

[0051] It should be noted that the present application does not make any limitation on the specific value of the first preset time. In actual application, the specific value of the first preset time can be set by the person skilled in the art according to actual needs.

[0052] Preferably, the first preset time is 30s-60s. By setting the first preset time to 30s-60s, the defrosting can be performed to a certain extent, and a large amount of liquid refrigerant can be avoided in the defrosting process to avoid damage to the compressor.

[0053] It should be noted that the present application does not make any limitation on the specific value of the second preset time. In actual application, the specific value of the second preset time can be set by the person skilled in the art according to actual needs.

[0054] Preferably, the second preset time is 30s-60s. The second preset time is set to 30s-60s, which can not only make the refrigerant circulate to improve the exhaust temperature, but also avoid the frost of the outer coil from being more serious due to the execution of the heating, avoid the aggravation of the frost degree, and ensure the defrosting effect.

[0055] Preferably, referring to Figure 3 , the step S3 "selectively executing the non-stop defrosting mode according to the comparison result" comprises:

[0056] S31: if the first temperature is greater than the first preset temperature, the non-stop defrosting mode is not executed, and the heating mode is continuously executed.

[0057] The first temperature is greater than the first preset temperature when the judgment result is "yes", which indicates that the frost degree of the outdoor heat exchanger does not reach the defrosting standard at this time, so that the non-stop defrosting mode is not executed, and the heating mode is continuously executed.

[0058] S32: if the first temperature is not greater than the first preset temperature, the non-stop defrosting mode is executed.

[0059] The first temperature is not greater than the first preset temperature when the judgment result is "no", which indicates that the frost degree of the outdoor heat exchanger reaches the defrosting standard at this time, so that the non-stop defrosting mode is executed.

[0060] Preferably, referring to Figure 4 , before the non-stop defrosting mode is executed, the defrosting control method further comprises:

[0061] S41: obtaining a cycle period of the previous execution of the non-stop defrosting mode, which is recorded as the last cycle period. The cycle period is the cycle number of the cyclic execution of the first defrosting mode and the second defrosting mode, and one cycle period is one cycle, which includes the execution of the first defrosting mode once and the execution of the second defrosting mode once.

[0062] S42: in the case of obtaining the last cycle period, step S43 is executed.

[0063] In the case of obtaining the last cycle period, it is indicated that the air conditioning system has been running before, and it is not the first time to run, so that the cycle period of the execution of the non-stop defrosting mode this time can be determined according to the cycle period of the previous execution of the non-stop defrosting mode.

[0064] S43: obtaining the continuous defrosting number of the execution of the non-stop defrosting mode in the last cycle period.

[0065] Exemplarily, when the last cycle period is 5, the number of continuous defrosting times when the cycle period is 5 is determined according to the operation record of the air conditioning system, and the last defrosting operation is the first time, and the number of continuous defrosting times is counted in turn. Specifically, for example, if the cycle period of the last defrosting operation is 5 and the cycle period of the last-but-one defrosting operation is 6, the number of continuous defrosting times is determined to be 1; if the cycle period of the last defrosting operation is 5, the cycle period of the last-but-one defrosting operation is 5, and the cycle period of the last-but-two defrosting operation is 6, the number of continuous defrosting times is 2, and so on.

[0066] S44: determining whether the number of continuous defrosting times is less than 3.

[0067] S45: if the determination result is "yes", determining the last cycle period as the target cycle period, and then performing step S31.

[0068] If the number of continuous defrosting times is less than 3, i.e. the number of continuous defrosting times of the last cycle period is not more than 2, the last cycle period is determined as the target cycle period.

[0069] S46: if the determination result is "no", determining the target cycle period according to the cycle period determination method, and then performing step S31.

[0070] If the number of continuous defrosting times is not less than 3, the number of continuous defrosting times of the last cycle period is at least 3, and it is possible to adjust the defrosting cycle period this time, so the target cycle period is determined according to the cycle period determination method.

[0071] S31: performing the non-stop defrosting mode this time with the target cycle period.

[0072] Preferably, please continue to refer to Figure 4 , the step of step S46 "determining the target cycle period according to the cycle period determination method" specifically includes:

[0073] S461: determining whether the number of continuous defrosting times is less than 4.

[0074] Determining whether the number of continuous defrosting times is less than 4, so as to determine the determination method according to the determination result.

[0075] S462: if the determination result is "yes", determining the target cycle period by the first determination method.

[0076] The determination result is "yes", which means that the number of continuous defrosting times is 3, and the target cycle period is determined by the first determination method.

[0077] S463: if the determination result is "no", determining the target cycle period by the second determination method.

[0078] The determination result is "No", indicating that the number of continuous defrosting is at least 4, and the second determination method is used to determine the target cycle period.

[0079] Through the above setting mode, before actually executing the non-stop defrosting mode, the cycle period of the current non-stop defrosting mode is determined first, so that the non-stop defrosting mode is executed according to the cycle period, which is convenient for control operation, and the defrosting time of each time is matched with the current frosting state, so as to ensure the defrosting effect and shorten the defrosting time as much as possible.

[0080] Preferably, referring to Figure 6 , the step of "determining the target cycle period by the first determination method" specifically includes:

[0081] S4621: obtaining the operation time of the heating mode between the adjacent two times of executing the non-stop defrosting mode in the process of executing the non-stop defrosting mode for the first three times, and recording as T 11 and T 12 . Wherein, T 12 is the operation time of the heating mode before the last time of executing the non-stop defrosting mode, and T 11 is the operation time of the heating mode before the second last time of executing the non-stop defrosting mode.

[0082] S4622: according to T 11 and T 12 , the last cycle period is selectively determined as the target cycle period.

[0083] Specifically, referring to Figure 6 , the step of "according to T 11 and T 12 , selectively determining the last cycle period as the target cycle period" specifically includes:

[0084] S46221: calculating the difference value of T 12 and T 11 , and recording as ΔT1, wherein ΔT1=T 12 -T 11 .

[0085] S46222: comparing the absolute value |ΔT1| of ΔT1 with the first preset difference value.

[0086] The absolute value |ΔT1| of ΔT1 is compared with the first preset difference value, whether the absolute value |ΔT1| of ΔT1 is greater than the first preset difference value is determined, and then according to the comparison result of the two, whether the last cycle period is determined as the target cycle period.

[0087] The present application does not limit the specific value of the first preset difference value, and in actual application, the specific value of the first preset difference value can be set by the person skilled in the art according to actual needs. Exemplarily, the first preset difference value is 5 min.

[0088] S46223: If |ΔT1| is not greater than the first preset difference value, the last cycle period is determined as the target cycle period.

[0089] If |ΔT1| is not greater than the first preset difference value, it indicates that the running time of the heating mode in the two consecutive times is not much different, that is, it is not necessary to adjust the cycle period of the defrosting operation, and the last cycle period is determined as the target cycle period.

[0090] S46224: If |ΔT1| is greater than the first preset difference value, it is judged whether ΔT1 is greater than 0.

[0091] If |ΔT1| is greater than the first preset difference value, it indicates that the running time of the heating mode in the two consecutive times is quite different, that is, it is necessary to further judge whether to increase or decrease a cycle period according to the size of ΔT1.

[0092] S46225: If ΔT1 is greater than 0, one cycle is subtracted from the last cycle period, and the cycle is determined as the target cycle period.

[0093] S46226: If ΔT1 is not greater than 0, one cycle is added to the last cycle period, and the cycle is determined as the target cycle period.

[0094] Preferably, referring to Figure 7 , the step of “determining the target cycle period by the second determination method” specifically includes:

[0095] S4631: The running time of the heating mode between the execution of the non-stop defrosting mode for the last four times is obtained, and is respectively recorded as T 21 , T 22 and T 23 . Among them, T 23 is the running time of the heating mode before the last execution of the non-stop defrosting mode, T 22 is the running time of the heating mode before the execution of the non-stop defrosting mode for the last time, and T 21 is the running time of the heating mode before the execution of the non-stop defrosting mode for the last time.

[0096] S4632: According to T 21 , T 22 and T 23 , the last cycle period is selectively determined as the target cycle period.

[0097] Preferably, please continue to refer to Figure 7 , the step S4632 "selecting the last cycle period as the target cycle period" specifically includes: 21 , T 22 and T 23 .

[0098] S46321: comparing T 23 with T 22 .

[0099] S46322: if T 23 is less than T 22 , executing step S463221.

[0100] S463221: judging whether T 22 is less than T 21 .

[0101] If T 22 is less than T 21 , executing step S463222; if T 22 is not less than T 21 , executing step S46325.

[0102] S463222: calculating the difference ΔT2 between T 21 and T 23 , ΔT2 = T 21 - T 23 .

[0103] S463223: comparing ΔT2 with the second preset difference value.

[0104] If ΔT2 is not greater than the second preset difference value, executing step S46325; if ΔT2 is greater than the second preset difference value, executing step S46326.

[0105] S46323: if T 23 is equal to T 22 , executing step S46325.

[0106] S46324: if T 23 is greater than T 22 , executing step S463241.

[0107] S463241: judging whether T 22 is greater than T 21 .

[0108] If T 22 is greater than T 21 , executing step S463242; if T 22not greater than T 21 Then, step S46325 is performed.

[0109] S463242: Calculate T 23 and T 21 , ΔT3 = T 23 -T 21 .

[0110] S463243: Compare ΔT3 with a second preset difference value.

[0111] If ΔT3 is not greater than the second preset difference value, step S46325 is performed; if ΔT3 is greater than the second preset difference value, step S46327 is performed.

[0112] S46325: Determine the last cycle period as the target cycle period.

[0113] S46326: Add one cycle to the last cycle period and determine the cycle as the target cycle period.

[0114] S46327: Subtract one cycle from the last cycle period and determine the cycle as the target cycle period.

[0115] Such a setting mode is more accurate in adjustment and can better guarantee the effect of each defrosting.

[0116] The present application does not make any limitation on the specific value of the second preset difference value, and in actual application, a person skilled in the art can set the specific value of the second preset difference value according to actual needs. Exemplarily, the second preset difference value is 7 min.

[0117] Preferably, referring to Figure 5 Before performing the non-stop defrosting mode, the defrosting control method further comprises:

[0118] S47: In the case where the last cycle period is not acquired, step S31 and step S481 are performed in sequence.

[0119] In the case where the last cycle period is not acquired, the previous data can be damaged or the heating mode is run for the first time, and then the non-stop defrosting mode is directly performed, and the running time of the non-stop defrosting mode is detected and determined according to the normal defrosting end node.

[0120] S31: Directly perform the non-stop defrosting mode.

[0121] S481: In the non-stop defrosting mode, the outdoor heat exchanger is acquired in real time, and the temperature of the outdoor heat exchanger is recorded as a second temperature.

[0122] S482: Compare the second temperature with a second preset temperature.

[0123] The second temperature is compared with a second preset temperature to determine whether the second temperature is greater than the second preset temperature, so as to selectively stop the non-stop defrosting mode according to the comparison result.

[0124] Specifically, “selectively stopping the non-stop defrosting mode based on the comparison result” includes:

[0125] S483: If the second temperature is greater than the second preset temperature, stop executing the non-stop defrosting mode.

[0126] If the second temperature is greater than the second preset temperature, it indicates that the frost on the outdoor heat exchanger has been removed, and the non-stop defrost mode is terminated. At the end of the non-stop defrost mode, the cycle period of the non-stop defrost mode is recorded so that the target cycle period can be determined based on the current cycle period the next time the non-stop defrost mode is executed.

[0127] S484: If the second temperature is not greater than the second preset temperature, the non-stop defrosting mode is executed.

[0128] If the second temperature is not greater than the second preset temperature, it indicates that the frost on the outdoor heat exchanger has not been completely removed, and the non-stop defrosting mode is continued to be executed for continued defrosting.

[0129] With this setting, even a new machine can smoothly execute the non-stop defrost mode, making it easy to use.

[0130] The second preset temperature is determined according to actual conditions and can be a system default value or a user-adjusted value. Specifically, the second preset temperature is higher than the first preset temperature.

[0131] Preferably, when the last cycle is obtained and before executing the non-stop defrost mode, the defrost control method further includes:

[0132] Determine whether the determined target cycle period is greater than the limit cycle period.

[0133] If the target cycle period is greater than the limit cycle period, the non-stop defrost mode is not executed, and the normal defrost mode is executed.

[0134] The target cycle period is greater than the limit cycle period, which means that the non-stop defrost mode cannot perform defrosting well and the defrosting effect is not good. At this time, the non-stop defrost mode is not executed and the normal defrost mode is switched to.

[0135] If the target cycle period is not greater than the limit cycle period, the non-stop defrosting mode is executed according to the target cycle period.

[0136] The target cycle period is not greater than the limit cycle period, which indicates that defrosting according to the non-stop defrosting mode is good, and the non-stop defrosting mode is executed according to the target cycle period.

[0137] The conventional defrosting mode is that the compressor is restarted and the four-way valve is reversed, so that the air conditioning system operates according to the refrigeration mode, and the second throttling valve is kept fully open.

[0138] In this way, when the non-stop defrosting mode cannot defrost well, that is, in extremely severe environments, the defrosting mode can be changed in time according to the actual situation to defrost as soon as possible and improve the user experience.

[0139] The technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A defrosting control method of an air conditioning system, characterized by, The air conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a first throttling valve and a second throttling valve, wherein the first end of the indoor heat exchanger is communicated with the compressor through the four-way valve, the second end of the indoor heat exchanger is communicated with the first end of the outdoor heat exchanger through the first throttling valve, the second end of the outdoor heat exchanger is communicated with the compressor through the four-way valve, and the second throttling valve is arranged between the second end of the outdoor heat exchanger and the four-way valve; The defrosting control method comprises: acquiring the outdoor heat exchanger's outer disc temperature in real time during the execution of the heating mode, denoted as a first temperature; comparing the first temperature with a first preset temperature; selectively executing a non-stop defrosting mode according to the comparison result; the non-stop defrosting mode comprises cyclically executing a first defrosting mode and a second defrosting mode until the defrosting is completed; wherein the first defrosting mode is to run a first preset time according to a first defrosting operation, in the first defrosting operation, the compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger all continue to run according to the state parameters in the heating mode before defrosting, the first throttling valve keeps fully open and the second throttling valve keeps fully closed; the second defrosting mode is to run a second preset time according to a second defrosting operation, in the second defrosting mode, the compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger all continue to run according to the state parameters in the heating mode before defrosting, the first throttling valve keeps the opening degree in the heating mode before defrosting and the second throttling valve keeps fully open.

2. The defrosting control method of an air conditioning system according to claim 1, wherein, Before executing the non-stop defrosting mode, the defrosting control method further comprises: acquiring the cycle period of the last execution of the non-stop defrosting mode, denoted as a last cycle period; wherein the cycle period is the cycle number of cyclically executing the first defrosting mode and the second defrosting mode; in the case of acquiring the last cycle period, acquiring the continuous defrosting number of executing the non-stop defrosting mode with the last cycle period; judging whether the continuous defrosting number is less than 3; if the judgment result is "yes", determining the last cycle period as a target cycle period, and then executing the non-stop defrosting mode this time with the target cycle period; if the judgment result is "no", determining the target cycle period according to a cycle period determination method, and then executing the non-stop defrosting mode this time with the target cycle period.

3. The defrosting control method of an air conditioning system according to claim 2, wherein, The step of "determining the target cycle period according to the cycle period determination method" specifically comprises: judging whether the continuous defrosting number is less than 4; if the judgment result is "yes", determining the target cycle period by a first determination method; if the judgment result is "no", determining the target cycle period by a second determination method.

4. The defrosting control method of an air conditioning system according to claim 3, wherein, The step of "determining the target cycle period by the first determination method" specifically comprises: obtaining the running time of the heating mode between two adjacent times of performing the non-stop defrosting mode among the first three times of performing the non-stop defrosting mode process, respectively recorded as T 11 and T 12 , wherein T 12 is the running time of the heating mode before the last time of performing the non-stop defrosting mode, and T 11 is the running time of the heating mode before the second last time of performing the non-stop defrosting mode. According to T 11 and T 12 , the last cycle period is determined as the target cycle period selectively.

5. The defrosting control method of an air conditioning system according to claim 4, wherein, "According to T 11 and T 12 , the step of selectively determining the last cycle period as the target cycle period" specifically includes: Calculate T 12 With T 11 The difference is recorded as ΔT1, where ΔT1 = T 12 -T 11 ; comparing the absolute value |ΔT1| of ΔT1 with a first preset difference value; if |ΔT1| is not greater than the first preset difference value, determining the last cycle period as the target cycle period; If |ΔT1| is greater than the first preset difference value, it is determined whether ΔT1 is greater than 0; If ΔT1 is greater than 0, one cycle is subtracted from the last cycle period and the cycle is determined as the target cycle period; If ΔT1 is not greater than 0, one cycle is added to the last cycle period and the cycle is determined as the target cycle period.

6. The defrosting control method of an air conditioning system according to claim 3, wherein, The step of "determining the target cycle period by the second determination method" specifically comprises: Obtain the running time of the heating mode between two adjacent executions of the non-stop defrosting mode during the first four executions of the non-stop defrosting mode, and record them as T 21 、T 22 and T 23 , where T 23 T is the running time of the heating mode before the last execution of the non-stop defrosting mode, 22 T is the running time of the heating mode before the last execution of the non-stop defrosting mode, 21 The running time of the heating mode before the last execution of the non-stop defrosting mode; According to T 21 , T 22 and T 23 , the last cycle period is selectively determined as the target cycle period.

7. The defrosting control method of an air conditioning system according to claim 6, wherein "according to T 21 , T 22 and T 23 , the step of selectively determining said last cycle period as said target cycle period" specifically comprises: T 23 compared to T 22 ; If T 23 is less than T 22 , then determine whether T 22 is less than T 21 ; If T 22 is less than T 21 , calculate the difference ΔT2 between T 21 and T 23 , ΔT2 = T 21 - T 23 ; compare ΔT2 with a second preset difference value, if ΔT2 is not greater than the second preset difference value, determine the last cycle period as the target cycle period; if ΔT2 is greater than the second preset difference value, add one cycle to the last cycle period and determine the cycle as the target cycle period; If T 22 is not less than T 21 , the last cycle period is determined as the target cycle period. If T 23 is equal to T 22 , the last cycle period is determined as the target cycle period. If T 23 is greater than T 22 , then it is determined whether T 22 is greater than T 21 ; If T 22 is greater than T 21 , calculate the difference ΔT3 between T 23 and T 21 , ΔT3 = T 23 - T 21 ; compare ΔT3 with a second preset difference value, if ΔT3 is not greater than the second preset difference value, determine the last cycle period as the target cycle period; if ΔT3 is greater than the second preset difference value, decrease one cycle period from the last cycle period and determine the cycle period as the target cycle period; If T 22 is not greater than T 21 , the last cycle period is determined as the target cycle period.

8. The defrosting control method of an air conditioning system according to claim 2, wherein, Before executing the non-stop defrosting mode, the defrosting control method further comprises: In the case where the last cycle period is not acquired, the non-stop defrosting mode is directly executed; In the execution of the non-stop defrosting mode, the outdoor heat exchanger is acquired in real time, and the temperature is recorded as a second temperature; The second temperature is compared with a second preset temperature; According to the comparison result, the non-stop defrosting mode is selectively stopped.

9. The defrosting control method of an air conditioning system according to any one of claims 2 to 8, characterized by, In the case where the last cycle period is acquired, and before the non-stop defrosting mode is executed, the defrosting control method further comprises: It is determined whether the determined target cycle period is greater than a limit cycle period; If the target cycle period is greater than the limit cycle period, the non-stop defrosting mode is not executed, and a normal defrosting mode is executed; If the target cycle period is not greater than the limit cycle period, the non-stop defrosting mode is executed according to the target cycle period; The normal defrosting mode is that the compressor is restarted, the four-way valve is reversed, the air conditioning system is operated in a refrigeration mode, and the second throttling valve is kept fully open.

10. An air conditioning system comprising a controller, characterised in that, The controller is configured to execute the defrosting control method of the air conditioning system according to any one of claims 1 to 9.

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