Control method and device for defrosting of air conditioner and air conditioner

Abstract

The invention provides a control method and device for defrosting of an air conditioner and the air conditioner. The method comprises the steps that on the basis that the air conditioner is in a heating mode, outdoor environment parameters and first heat exchange parameters of all heat exchange units are obtained, and the outdoor environment parameters at least comprise the temperature of the environment where the air conditioner is located; the first heat exchange parameters at least comprise the temperature of a refrigerant flow path of the heat exchange unit and the opening degree of an electronic expansion valve; generating a control strategy based on the outdoor environment parameters and the first heat exchange parameters, wherein the control strategy at least comprises the opening degree of an electronic expansion valve and the rotating speed of an outdoor unit fan; and when the air conditioner is in the heating mode, non-stop defrosting is conducted on the heat exchange unit based on the control strategy. According to the control method and the control device, the regional intermittent overheating control is carried out on the outdoor heat exchanger, so that independent defrosting treatment is carried out on the heat exchange units in different regions, it is guaranteed that the air conditioner can always carry out heating operation, only a small amount of heating capacity is sacrificed in an individual time period, the indoor comfort is guaranteed, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a control method and device for defrosting of an air conditioner and the air conditioner. BACKGROUND

[0002] At present, when the air conditioner is running in heating mode in winter, the heat exchanger of the outdoor unit exchanges heat with the external air in convection, which can condense water molecules in the air and attach them to the surface of the heat exchanger. When the air conditioner is running in heating mode for a long time, the water on the fins of the outdoor heat exchanger does not flow in time, or further exchanges heat with the hairpin tube which is lower than the water freezing temperature, and the water begins to freeze from the liquid state. When the heat exchanger begins to frost, the heat exchanger and the external air exchange heat, which leads to a decrease in the heat exchange coefficient of the heat exchanger, resulting in a decrease in the heating capacity of the air conditioning system.

[0003] When the heat exchanger begins to frost, it has two adverse effects on the outdoor heat exchanger. On the one hand, it leads to a decrease in the heat exchange coefficient of the heat exchanger, resulting in a decrease in the heating capacity of the air conditioning system. On the other hand, it further hinders the flow of condensed water, and the frost on the heat exchanger further expands, resulting in a flow imbalance of the refrigerant inside the heat exchanger due to different temperatures in different regions of the heat exchanger, which further affects the heating capacity of the air conditioning system.

[0004] In related technologies, when the air conditioner is running in heating mode, it often adopts the form of reversing the four-way valve for a period of time to defrost the outdoor heat exchanger. At this time, the air conditioner is equivalent to running in cooling mode, and the difference between normal cooling and this time is that the fans of the indoor and outdoor units are stopped running to ensure that the indoor unit does not blow cold air, and the outdoor heat exchanger can also heat the hairpin tube to melt the ice and frost on it. The impact of this method is that the air conditioning system does not perform heating output during this stage, and the indoor side relies entirely on its own thermal insulation effect to maintain the indoor temperature. During this stage, the air conditioner has no energy output, and its heating capacity is greatly reduced. SUMMARY

[0005] The present application provides a control method and device for defrosting of an air conditioner, which solves the defect that the existing defrosting mode does not perform heating output during this stage, the indoor side relies entirely on its own thermal insulation effect to maintain the indoor temperature, and the air conditioner has no energy output during this stage, which greatly reduces its heating capacity.

[0006] According to the control method for defrosting of an air conditioner provided by the first aspect of the present application, the heat exchanger of the air conditioner is provided with a plurality of parallel heat exchange units, and each heat exchange unit is provided with an electronic expansion valve on the upstream side.

[0007] The method comprises:

[0008] Based on the air conditioner in the heating mode, an outdoor environment parameter and a first heat exchange parameter of each heat exchange unit are acquired, the outdoor environment parameter at least including a temperature of an environment where the air conditioner is located, and the first heat exchange parameter at least including a temperature of a refrigerant flow path of the heat exchange unit and an opening degree of the electronic expansion valve;

[0009] Based on the outdoor environment parameter and the first heat exchange parameter, a control strategy is generated, the control strategy at least including adjusting the opening degree of the electronic expansion valve and a rotating speed of an outdoor unit fan;

[0010] In the air conditioner in the heating mode, the heat exchange unit is defrosted based on the control strategy.

[0011] According to an embodiment of the present application, the step of acquiring the first heat exchange parameter of each heat exchange unit specifically includes:

[0012] The first heat exchange temperature between the electronic expansion valve and the heat exchange unit and the second heat exchange temperature of the refrigerant at an outlet end of the heat exchange unit are acquired;

[0013] The first heat exchange parameter is generated based on the first heat exchange temperature and the second heat exchange temperature.

[0014] Specifically, the embodiment provides an embodiment of acquiring the first heat exchange parameter of each heat exchange unit.

[0015] According to an embodiment of the present application, the step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically includes:

[0016] When the outdoor temperature identified by the outdoor environment parameter is less than a first preset outdoor temperature, and the first heat exchange parameter indicates that the heat exchanger is in a defrosting standby state, a control strategy of switching the air conditioner from the heating mode to a normal defrosting mode is generated.

[0017] Specifically, the embodiment provides an embodiment of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter.

[0018] According to an embodiment of the present application, the step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically further includes:

[0019] When the outdoor temperature identified by the outdoor environment parameter is greater than or equal to a first preset outdoor temperature and less than a second preset outdoor temperature, the first heat exchange temperature is acquired.

[0020] obtaining a first duration, based on the first heat exchange temperature being less than or equal to a first preset heat exchange temperature, the first duration being a duration that the heat exchange unit is maintained at the first heat exchange temperature, the first preset heat exchange temperature being less than or equal to a defrost target temperature value, the defrost target temperature value being a function value output by a defrost target function constructed based on the outdoor environment parameter;

[0021] generating the control strategy of adjusting the electronic expansion valve corresponding to the heat exchange unit to the closed state, based on the first duration being greater than or equal to a preset duration.

[0022] Specifically, the embodiment provides an implementation of generating a control strategy based on the outdoor environment parameter and the first heat exchange parameter.

[0023] According to an embodiment of the present application, the step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically further comprises:

[0024] obtaining the first heat exchange temperature, based on the outdoor temperature identified based on the outdoor environment parameter being greater than or equal to a second preset outdoor temperature;

[0025] obtaining a second duration, based on the first heat exchange temperature being less than or equal to a second preset heat exchange temperature, the second duration being a duration that the heat exchange unit is maintained at the first heat exchange temperature;

[0026] generating the control strategy of adjusting the electronic expansion valve corresponding to the heat exchange unit to the closed state, based on the second duration being greater than or equal to a preset duration.

[0027] Specifically, the embodiment provides an implementation of generating a control strategy based on the outdoor environment parameter and the first heat exchange parameter.

[0028] According to an embodiment of the present application, the step of generating the control strategy of adjusting the electronic expansion valve corresponding to the heat exchange unit to the closed state specifically further comprises:

[0029] obtaining a preset number of each of the heat exchange units to be adjusted, based on the number of the heat exchange units to be adjusted being greater than or equal to a preset number;

[0030] sequentially adjusting the electronic expansion valve corresponding to the heat exchange unit to the closed state, based on the preset number sequence.

[0031] Specifically, the embodiment provides an implementation of generating the control strategy of adjusting the electronic expansion valve corresponding to the heat exchange unit to the closed state.

[0032] According to an embodiment of the present application, the step of defrosting the heat exchange unit without shutdown based on the control strategy specifically comprises:

[0033] When the heat exchange unit is in the defrosting without shutdown, the electronic expansion valve corresponding to the heat exchange unit is adjusted to the closed state, and the rotating speed of the outdoor fan is adjusted to a preset rotating speed, which is greater than the rotating speed of the outdoor fan in the heating mode.

[0034] When the duration of defrosting the heat exchange unit without shutdown reaches a third duration, the electronic expansion valve corresponding to the heat exchange unit is adjusted to an initial state, which is the opening degree of the electronic expansion valve before the heat exchange unit enters defrosting.

[0035] Specifically, the embodiment provides an implementation of defrosting the heat exchange unit without shutdown based on the control strategy.

[0036] According to an embodiment of the present application, the step of adjusting the electronic expansion valve corresponding to the heat exchange unit to the initial state specifically further comprises:

[0037] Based on the electronic expansion valve corresponding to the heat exchange unit being adjusted to the initial state, a third preset heat exchange temperature and an instant superheat degree are obtained, the third preset heat exchange temperature is a target superheat temperature of the heat exchange unit after defrosting without shutdown, and the instant superheat degree is a temperature value determined based on the first heat exchange temperature and the second heat exchange temperature.

[0038] Based on the instant superheat degree meeting the third preset heat exchange temperature, the real-time opening degree of the electronic expansion valve corresponding to the heat exchange unit is adjusted.

[0039] Specifically, the embodiment provides an implementation of adjusting the electronic expansion valve corresponding to the heat exchange unit to the initial state.

[0040] According to an embodiment of the present application, the step of defrosting the heat exchange unit without shutdown based on the control strategy specifically comprises:

[0041] When the heat exchange unit is in the defrosting without shutdown, a second heat exchange parameter of the remaining heat exchange units is obtained in real time.

[0042] When the second heat exchange parameter indicates that the corresponding heat exchange unit is in the defrosting state, a first frosting time and a second frosting time are obtained, the first frosting time is the time when the heat exchange unit corresponding to the first heat exchange parameter enters the defrosting state, and the second frosting time is the time when the heat exchange unit corresponding to the second heat exchange parameter enters the defrosting state.

[0043] based on the difference between the first frosting time and the second frosting time being less than or equal to a preset interval threshold, defrosting the heat exchange units according to a current defrosting sequence without stopping the air conditioner;

[0044] based on the difference between the first frosting time and the second frosting time being greater than the preset interval threshold, obtaining a first heat exchange temperature of all the heat exchange units that need to be defrosted without stopping the air conditioner, and defrosting the heat exchange units according to the temperature values corresponding to all the first heat exchange temperatures.

[0045] Specifically, the embodiment provides an implementation of defrosting the heat exchange units based on the control strategy.

[0046] According to a second aspect of the present application, a control device for defrosting an air conditioner is provided, the air conditioner comprising: a heat exchanger of the air conditioner provided with a plurality of parallel heat exchange units, and an electronic expansion valve arranged on an upstream side of each heat exchange unit;

[0047] The device comprises:

[0048] a parameter acquisition module configured to acquire an outdoor environment parameter and a first heat exchange parameter of each heat exchange unit based on the air conditioner being in a heating mode, the outdoor environment parameter comprising at least a temperature of an environment in which the air conditioner is located, and the first heat exchange parameter comprising at least a temperature of a refrigerant flow path of the heat exchange unit and an opening degree of the electronic expansion valve;

[0049] a strategy generation module configured to generate a control strategy based on the outdoor environment parameter and the first heat exchange parameter, the control strategy comprising at least adjustment of the opening degree of the electronic expansion valve and a rotating speed of an outdoor unit fan;

[0050] a strategy execution module configured to defrost the heat exchange units based on the control strategy without stopping the air conditioner when the air conditioner is in the heating mode.

[0051] According to a third aspect of the present application, an air conditioner is provided, comprising: a memory and a processor;

[0052] The memory and the processor complete mutual communication through a bus;

[0053] The memory stores computer instructions capable of running on the processor;

[0054] When the processor invokes the computer instructions, the processor can execute the above-mentioned control method for defrosting an air conditioner.

[0055] The one or more technical solutions in the application have at least one of the following technical effects: the control method and device for defrosting of the air conditioner and the air conditioner provided by the application achieve separate defrosting treatment of different area heat exchange units through intermittent overheating control of the outdoor heat exchanger, ensure that the air conditioner can always perform heating operation, only a small amount of heating capacity is sacrificed at individual time periods, ensure indoor comfort, and reduce the four-way valve reversing process of the whole machine, improve the stability of equipment operation and the experience of users.

[0056] Further, in the heating process, the application achieves different control of defrosting according to the outdoor ring temperature, so as to reduce the dependence on heating capacity output to complete defrosting of the outdoor heat exchanger, ensure the user's comfort experience, avoid the prior art of defrosting the outdoor unit through the four-way valve reversing under all heating conditions, reduce the user's comfort experience, and greatly reduce the problem of machine heating capacity. BRIEF DESCRIPTION OF DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0058] Figure 1 is one of the structural schematic diagrams of the air conditioner provided by the application;

[0059] Figure 2 is the second structural schematic diagram of the air conditioner provided by the application;

[0060] Figure 3 is the flowchart of the control method for defrosting of the air conditioner provided by the application;

[0061] Figure 4 is the structural schematic diagram of the control device for defrosting of the air conditioner provided by the application;

[0062] Figure 5 is the structural schematic diagram of the electronic device provided by the application.

[0063] REFERENCE SIGNS:

[0064] 10, heat exchanger; 11, heat exchange unit; 20, electronic expansion valve; 30, four-way reversing valve; 40, oil separator; 50, compressor; 60, gas-liquid separator;

[0065] 100, parameter acquisition module;

[0066] 110, a policy generation module; 20, a policy execution module;

[0067] 810, a processor; 820, a communication interface; 830, a memory; 840, a communication bus. DETAILED DESCRIPTION

[0068] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0069] The present application will be described below in detail with reference to the drawings in the description. The specific operation methods in the method embodiments can also be applied to the device embodiments or the system embodiments. In the description of the present application, unless otherwise specified, “at least one” includes one or more. “Multiple” refers to two or more. For example, at least one of A, B and C includes: A alone, B alone, A and B together, A and C together, B and C together, and A, B and C together. In the present application, “ / ” means or, for example, A / B can mean A or B; “and / or” in this document only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone.

[0070] The present application will be described below in detail with reference to the drawings in the description. The specific operation methods in the method embodiments can also be applied to the device embodiments or the system embodiments. In the description of the present application, unless otherwise specified, “at least one” includes one or more. “Multiple” refers to two or more. For example, at least one of A, B and C includes: A alone, B alone, A and B together, A and C together, B and C together, and A, B and C together. In the present application, “ / ” means or, for example, A / B can mean A or B; “and / or” in this document only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone.

[0070] The present application will be described below in detail with reference to the drawings in the description. The specific operation methods in the method embodiments can also be applied to the device embodiments or the system embodiments. In the description of the present application, unless otherwise specified, “at least one” includes one or more. “Multiple” refers to two or more. For example, at least one of A, B and C includes: A alone, B alone, A and B together, A and C together, B and C together, and A, B and C together. In the present application, “ / ” means or, for example, A / B can mean A or B; “and / or” in this document only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone.

[0070] The present application will be described below in detail with reference to the drawings in the description. The specific operation methods in the method embodiments can also be applied to the device embodiments or the system embodiments. In the description of the present application, unless otherwise specified, “at least one” includes one or more. “Multiple” refers to two or more. For example, at least one of A, B and C includes: A alone, B alone, A and B together, A and C together, B and C together, and A, B and C together. In the present application, “ / ” means or, for example, A / B can mean A or B; “and / or” in this document only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone.

[0070] The present application will be described below in detail with reference to the drawings in the description. The specific operation methods in the method embodiments can also be applied to the device embodiments or the system embodiments. In the description of the present application, unless otherwise specified, “at least one” includes one or more. “Multiple” refers to two or more. For example, at least one of A, B and C includes: A alone, B alone, A and B together, A and C together, B and C together, and A, B and C together. In the present application, “ / ” means or, for example, A / B can mean A or B; “and / or” in this document only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone.

[0071] In some embodiments of the present application, as shown in Figures 1 to 3 The present application provides a control method for defrosting of an air conditioner, the air conditioner comprising: a heat exchanger 10 of the air conditioner is provided with a plurality of parallel heat exchange units 11, and each heat exchange unit 11 is provided with an electronic expansion valve 20 on the upstream side thereof;

[0072] The method comprises:

[0073] Based on the air conditioner being in a heating mode, an outdoor environment parameter and a first heat exchange parameter of each heat exchange unit 11 are acquired, the outdoor environment parameter at least including a temperature of an environment in which the air conditioner is located, and the first heat exchange parameter at least including a temperature of a refrigerant flow path of the heat exchange unit 11 and an opening degree of the electronic expansion valve 20;

[0074] Based on the outdoor environment parameter and the first heat exchange parameter, a control strategy is generated, the control strategy at least including an opening degree of the electronic expansion valve 20 and a rotating speed of an outdoor unit fan;

[0075] In the heating mode of the air conditioner, the heat exchange unit 11 is defrosted based on the control strategy.

[0076] It should be noted that, by acquiring the outdoor environment and the operation of each heat exchange unit 11, and then adjusting the speed of the outdoor fan and the opening degree of the corresponding electronic expansion valve 20 of each heat exchange unit 11 under the condition of meeting the relevant conditions, on the one hand, the defrosting treatment of the heat exchange unit 11 that may appear frost is realized, and on the other hand, the continuity of indoor heating is realized, only a small amount of heating capacity is sacrificed in individual time period, avoiding the switching of the four-way valve in the conventional defrosting, thereby affecting the user experience.

[0077] Further, by intermittently overheating the heat exchange unit 11 of the outdoor unit, it is ensured that the air conditioner can defrost the outdoor heat exchanger 10 while continuously operating in heating mode. Thus, the indoor comfort and the heating effect of the whole machine are ensured, and the influence of the system internal fluctuation caused by the traditional defrosting four-way valve switching on the reliability of the compressor 50 is avoided.

[0078] In some possible embodiments of the present application, the step of acquiring the first heat exchange parameter of each heat exchange unit 11 specifically comprises:

[0079] The first heat exchange temperature and the second heat exchange temperature of each heat exchange unit 11 are acquired, the first heat exchange temperature is the refrigerant temperature between the electronic expansion valve 20 and the heat exchange unit 11, and the second heat exchange temperature is the refrigerant temperature at the outlet end of the heat exchange unit 11;

[0080] The first heat exchange parameter is generated based on the first heat exchange temperature and the second heat exchange temperature.

[0081] Specifically, the embodiment provides an implementation of acquiring the first heat exchange parameter of each heat exchange unit 11. By acquiring the refrigerant temperature on the upstream side and the downstream side of each heat exchange unit 11, the accuracy of judging the frosting condition of the heat exchange unit 11 is improved, and in the case that the heat exchange unit 11 has frosting risk, the defrosting of the corresponding heat exchange unit 11 is realized by timely adjusting the opening degree of the corresponding electronic expansion valve 20 and the speed of the outdoor fan. The present application has the advantage of realizing the non-stop regional defrosting control above 0℃ outdoor temperature without increasing the pipeline cost.

[0082] Further, by alternately closing the electronic expansion valves 20 of different heat exchange units 11, the pipe temperature of the outdoor heat exchanger 10 in different regions can be close to room temperature, and the heat exchange with outdoor air is stopped to continue to produce frost. At the same time, by increasing the operating speed of the outdoor fan, the outdoor fan volume is increased to remove the frost layer. At the same time, the refrigerant circulation amount of the heat exchanger 10 in other regions is ensured, and the system high pressure pressure caused by the sudden closing of the outdoor heat exchanger 10 in individual region is avoided.

[0083] In some possible implementation of the present application, the step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically comprises:

[0084] When the outdoor temperature identified based on the outdoor environment parameter is less than the first preset outdoor temperature, and the first heat exchange parameter indicates that the heat exchanger 10 is in the defrosting standby state, the control strategy of switching the air conditioner from the heating mode to the normal defrosting mode is generated.

[0085] Specifically, the embodiment provides an implementation of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter. Since the melting point of water is 0℃, the defrosting method is only applicable to the environment working condition above 0℃, otherwise, once the frost layer is melted into water and frozen into ice and attached to the hairpin tube, the ice layer is difficult to be removed even if the air volume is large. Therefore, by acquiring and judging the outdoor temperature, the rationality of the defrosting form of the outdoor heat exchanger 10 is ensured, and the defrosting effect is guaranteed.

[0086] In a possible embodiment, the first preset outdoor temperature is 1℃.

[0087] In some possible implementation of the present application, the step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically comprises:

[0088] When the outdoor temperature identified based on the outdoor environment parameter is greater than or equal to the first preset outdoor temperature and less than the second preset outdoor temperature, the first heat exchange temperature is acquired.

[0089] When the first heat exchange temperature is less than or equal to the first preset heat exchange temperature, the first duration is acquired, the first duration is the duration of the heat exchange unit 11 at the first heat exchange temperature, the first preset heat exchange temperature is less than or equal to the defrosting target temperature value, and the defrosting target temperature value is the function value output by the defrosting target function constructed based on the outdoor environment parameter.

[0090] When the first duration is greater than or equal to the preset duration, the control strategy of adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to the closed state is generated.

[0091] Specifically, the embodiment provides an implementation of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter. According to the interval of the outdoor temperature, the defrosting target temperature value of the heat exchange unit 11 is judged in different degrees, so that the heat exchange unit 11 can be defrosted in time in the early stage of frosting, and the defrosting is alternated according to the different temperatures of each heat exchange unit 11, so as to avoid excessive system pressure.

[0092] In a possible embodiment, the first preset outdoor temperature is 1℃, and the second preset outdoor temperature is 4℃.

[0093] In a possible embodiment, the first duration is greater than or equal to 3 minutes and less than or equal to 6 minutes.

[0094] In a possible embodiment, the defrosting target function is y = xT-i, where y is a defrosting target temperature value, x and i are coefficients, T is an outdoor environment temperature, that is, an outdoor environment parameter, x takes a value such as 0.8, and i takes a value such as 8.5.

[0095] In some possible embodiments of the present application, the step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter further comprises the following steps.

[0096] The outdoor temperature identified based on the outdoor environment parameter is greater than or equal to a second preset outdoor temperature, and the first heat exchange temperature is obtained.

[0097] Based on the fact that the first heat exchange temperature is less than or equal to a second preset heat exchange temperature, a second duration is obtained, which is the duration of the heat exchange unit 11 at the first heat exchange temperature.

[0098] Based on the fact that the second duration is greater than or equal to a preset duration, a control strategy is generated to adjust the electronic expansion valve 20 corresponding to the heat exchange unit 11 to the closed state.

[0099] Specifically, the present embodiment provides an implementation of generating a control strategy based on an outdoor environment parameter and a first heat exchange parameter. According to the interval of the outdoor temperature, the defrosting target temperature value of the heat exchange unit 11 is judged to different degrees. When the outdoor temperature is greater than a second preset outdoor temperature, the comparison relationship between the first heat exchange temperature and the second preset heat exchange temperature of the corresponding heat exchange unit 11 is obtained, so that the heat exchange unit 11 can be defrosted in time in the early stage of frosting, and the heat exchange units 11 are defrosted alternately according to different temperatures, thereby avoiding excessive system pressure.

[0100] In a possible embodiment, the second preset heat exchange temperature is -7 degrees Celsius.

[0101] In a possible embodiment, the second duration is greater than or equal to 3 minutes and less than or equal to 6 minutes.

[0102] In some possible embodiments of the present application, the step of generating the control strategy to adjust the electronic expansion valve 20 corresponding to the heat exchange unit 11 to the closed state further comprises the following steps.

[0103] Based on the fact that the number of heat exchange units 11 to be adjusted in the state of the electronic expansion valve 20 is greater than or equal to a preset number, a preset number of each heat exchange unit 11 to be adjusted is obtained.

[0104] Based on the preset number sequence, the electronic expansion valve 20 corresponding to the heat exchange unit 11 is adjusted to the closed state in sequence.

[0105] Specifically, the embodiment provides an implementation of a control strategy for adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to a closed state, when the plurality of heat exchange units 11 are all in the frosting state, and the electronic expansion valve 20 corresponding to the heat exchange unit 11 needs to be closed alternately, so as to avoid the simultaneous closing of the plurality of heat exchange units 11, which causes the system pressure to suddenly increase and affects the indoor heating effect.

[0106] Further, the opening and closing of the electronic expansion valve 20 is adjusted according to the preset number sequence of each heat exchange unit 11, so that the electronic expansion valve 20 corresponding to the heat exchange unit 11 is alternately opened and closed, and the electronic expansion valve 20 of the heat exchange unit 11 is prevented from being closed at the same time.

[0107] In some possible embodiments of the present application, the step of defrosting the heat exchange unit 11 without shutdown based on the control strategy specifically includes:

[0108] When the heat exchange unit 11 is in the defrosting without shutdown state, the electronic expansion valve 20 corresponding to the heat exchange unit 11 is adjusted to a closed state, and the rotating speed of the outdoor fan is adjusted to a preset rotating speed, which is greater than the rotating speed of the outdoor fan in the heating mode.

[0109] When the duration of the defrosting of the heat exchange unit 11 without shutdown continuously reaches a third duration, the electronic expansion valve 20 corresponding to the heat exchange unit 11 is adjusted to an initial state, which is the opening degree of the electronic expansion valve 20 before the heat exchange unit 11 enters the defrosting.

[0110] Specifically, the embodiment provides an implementation of defrosting the heat exchange unit 11 without shutdown based on the control strategy, and when the heat exchange unit 11 is in the defrosting without shutdown state, the rotating speed of the outdoor fan is adjusted accordingly, and the operating rotating speed of the outdoor fan is increased to pull up the outdoor fan air volume to remove the frost layer.

[0111] In possible embodiments, the third duration is greater than or equal to 3 min and less than or equal to 6 min.

[0112] In some possible embodiments of the present application, the step of adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to the initial state specifically further includes:

[0113] Based on the electronic expansion valve 20 corresponding to the heat exchange unit 11 being adjusted to the initial state, a third preset heat exchange temperature and an instantaneous superheat degree are obtained, the third preset heat exchange temperature is a target superheat temperature of the heat exchange unit 11 after the defrosting without shutdown, and the instantaneous superheat degree is a temperature value determined based on the first heat exchange temperature and the second heat exchange temperature.

[0114] Based on the instantaneous superheat degree satisfying the third preset heat exchange temperature, the real-time opening degree of the electronic expansion valve 20 corresponding to the heat exchange unit 11 is adjusted.

[0115] Specifically, the embodiment provides an implementation of adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to the initial state, and after the electronic expansion valve 20 of the heat exchange unit 11 is closed for a certain time length, the opening degree of the electronic expansion valve 20 is controlled according to a target superheat temperature determined according to the first heat exchange temperature and the second heat exchange temperature of the heat exchange unit 11, so that the refrigerant is normally heat-exchanged, the overall system is normally operated, and the frosting of the heat exchange unit 11 is avoided from occurring again.

[0116] In some possible embodiments of the present application, the step of performing non-stop defrosting on the heat exchange unit 11 based on the control strategy specifically includes:

[0117] In the case that the heat exchange unit 11 is in non-stop defrosting, the second heat exchange parameters of the remaining heat exchange units 11 are acquired in real time;

[0118] In the case that the second heat exchange parameter indicates that the corresponding heat exchange unit 11 is in the defrosting standby state, the first frosting time and the second frosting time are acquired, the first frosting time is the time when the heat exchange unit 11 corresponding to the first heat exchange parameter enters the defrosting standby state, and the second frosting time is the time when the heat exchange unit 11 corresponding to the second heat exchange parameter enters the defrosting standby state;

[0119] Based on the difference between the first frosting time and the second frosting time being less than or equal to a preset interval threshold, the heat exchange unit 11 is defrosted according to the current defrosting sequence;

[0120] Based on the difference between the first frosting time and the second frosting time being greater than the preset interval threshold, the first heat exchange temperatures of all the heat exchange units 11 that need to be defrosted are acquired, and the heat exchange units 11 are defrosted according to the temperature values of the first heat exchange temperatures.

[0121] Specifically, the embodiment provides an implementation of performing non-stop defrosting on the heat exchange unit 11 based on a control strategy, and while the heat exchange unit 11 is defrosted, other heat exchange units 11 may also be frosted. According to the time when the heat exchange unit 11 in the frosting enters the frosting, the corresponding defrosting sequence is determined, the defrosting sequence of the heat exchange unit 11 is ensured to be reasonable, and the heat exchange unit 11 can be defrosted in time.

[0122] In some specific embodiments of the present application, as shown in Figure 1 , Figure 2 and Figure 4 , the present scheme provides a control device for defrosting of an air conditioner, the air conditioner comprising: a heat exchanger 10 of the air conditioner, which is provided with a plurality of parallel heat exchange units 11, and each heat exchange unit 11 is provided with an electronic expansion valve 20 on an upstream side;

[0123] The device comprises:

[0124] The parameter acquisition module 100 is configured to acquire an outdoor environment parameter and a first heat exchange parameter of each heat exchange unit 11 based on that the air conditioner is in the heating mode, wherein the outdoor environment parameter at least includes a temperature of an environment where the air conditioner is located, and the first heat exchange parameter at least includes a temperature of a refrigerant flow path of the heat exchange unit 11 and an opening degree of the electronic expansion valve 20;

[0125] The strategy generation module 110 is configured to generate a control strategy based on the outdoor environment parameter and the first heat exchange parameter, wherein the control strategy at least includes adjusting the opening degree of the electronic expansion valve 20 and a rotating speed of an outdoor unit fan.

[0126] The strategy execution module 120 is configured to perform non-stop defrosting on the heat exchange unit 11 based on the control strategy when the air conditioner is in the heating mode.

[0127] Possibly, the step of acquiring the first heat exchange parameter of each heat exchange unit 11 specifically includes:

[0128] The first heat exchange temperature and the second heat exchange temperature of each heat exchange unit 11 are acquired, wherein the first heat exchange temperature is a refrigerant temperature between the electronic expansion valve 20 and the heat exchange unit 11, and the second heat exchange temperature is a refrigerant temperature at an outlet end of the heat exchange unit 11.

[0129] The first heat exchange parameter is generated based on the first heat exchange temperature and the second heat exchange temperature.

[0130] Specifically, the embodiment provides an implementation manner of acquiring the first heat exchange parameter of each heat exchange unit 11.

[0131] Possibly, the step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically includes:

[0132] When the outdoor temperature identified based on the outdoor environment parameter is less than a first preset outdoor temperature, and the heat exchanger 10 is in a defrosting standby state identified based on the first heat exchange parameter, a control strategy of switching the air conditioner from the heating mode to a normal defrosting mode is generated.

[0133] Specifically, the embodiment provides an implementation manner of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter.

[0134] Possibly, the step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically further includes:

[0135] When the outdoor temperature identified based on the outdoor environment parameter is greater than or equal to the first preset outdoor temperature and less than a second preset outdoor temperature, the first heat exchange temperature is acquired.

[0136] obtaining a first duration, the first duration being a duration that the heat exchange unit 11 continues at the first heat exchange temperature, based on the first heat exchange temperature being less than or equal to a first preset heat exchange temperature, the first preset heat exchange temperature being less than or equal to a defrost target temperature value, the defrost target temperature value being a function value output by a defrost target function constructed based on an outdoor environment parameter;

[0137] generating a control strategy of adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to a closed state, based on the first duration being greater than or equal to a preset duration.

[0138] Specifically, the embodiment provides an implementation of generating a control strategy based on an outdoor environment parameter and a first heat exchange parameter.

[0139] Possibly, the step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically further includes:

[0140] obtaining the first heat exchange temperature based on the outdoor temperature identified based on the outdoor environment parameter being greater than or equal to a second preset outdoor temperature;

[0141] obtaining a second duration, the second duration being a duration that the heat exchange unit 11 continues at the first heat exchange temperature, based on the first heat exchange temperature being less than or equal to a second preset heat exchange temperature;

[0142] generating a control strategy of adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to a closed state, based on the second duration being greater than or equal to a preset duration.

[0143] Specifically, the embodiment provides an implementation of generating a control strategy based on an outdoor environment parameter and a first heat exchange parameter.

[0144] Possibly, the step of generating the control strategy of adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to a closed state specifically further includes:

[0145] obtaining a preset number of each heat exchange unit 11 to be adjusted, based on a quantity of the heat exchange units 11 in a state to be adjusted of the electronic expansion valve 20 being greater than or equal to a preset quantity.

[0146] sequentially adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to a closed state based on a preset number order.

[0147] Specifically, the embodiment provides an implementation of generating a control strategy of adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to a closed state.

[0148] Possibly, the step of performing non-stop defrosting on the heat exchange unit 11 based on the control strategy specifically includes:

[0149] In the case that the heat exchange unit 11 is in the non-stop defrosting, the electronic expansion valve 20 corresponding to the heat exchange unit 11 is adjusted to a closed state, and the rotating speed of the outdoor fan is adjusted to a preset rotating speed, which is greater than the rotating speed of the outdoor fan in the heating mode.

[0150] Based on the duration of the non-stop defrosting of the heat exchange unit 11 continuously reaching a third duration, the electronic expansion valve 20 corresponding to the heat exchange unit 11 is adjusted to an initial state, which is the opening degree of the electronic expansion valve 20 of the heat exchange unit 11 before entering the defrosting.

[0151] Specifically, the embodiment provides an implementation of non-stop defrosting of the heat exchange unit 11 based on a control strategy.

[0152] Possibly, the step of adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to the initial state further includes:

[0153] Based on the electronic expansion valve 20 corresponding to the heat exchange unit 11 being adjusted to the initial state, a third preset heat exchange temperature and an instant superheat degree are obtained, the third preset heat exchange temperature is a target superheat temperature of the heat exchange unit 11 after the non-stop defrosting, and the instant superheat degree is a temperature value determined based on the first heat exchange temperature and the second heat exchange temperature.

[0154] Based on the instant superheat degree satisfying the third preset heat exchange temperature, the real-time opening degree of the electronic expansion valve 20 corresponding to the heat exchange unit 11 is adjusted.

[0155] Specifically, the embodiment provides an implementation of adjusting the electronic expansion valve 20 corresponding to the heat exchange unit 11 to the initial state.

[0156] Possibly, the step of non-stop defrosting of the heat exchange unit 11 based on the control strategy specifically includes:

[0157] In the case that the heat exchange unit 11 is in the non-stop defrosting, the second heat exchange parameters of the remaining heat exchange units 11 are obtained in real time.

[0158] In the case that the second heat exchange parameter indicates that the corresponding heat exchange unit 11 is in the defrosting standby state, the first frosting time and the second frosting time are obtained, the first frosting time is the time when the heat exchange unit 11 corresponding to the first heat exchange parameter enters the defrosting standby state, and the second frosting time is the time when the heat exchange unit 11 corresponding to the second heat exchange parameter enters the defrosting standby state.

[0159] Based on the difference between the first frosting time and the second frosting time being less than or equal to a preset interval threshold, the heat exchange unit 11 is defrosted in the current defrosting order.

[0160] Based on the difference between the first frosting moment and the second frosting moment being greater than a preset interval threshold, a first heat exchange temperature of all heat exchange units 11 requiring non-stop defrosting is obtained, and the heat exchange units 11 are defrosted non-stop according to the temperature values corresponding to all the first heat exchange temperatures.

[0161] Specifically, the embodiment provides an implementation of non-stop defrosting of the heat exchange units 11 based on a control strategy.

[0162] In some specific embodiments of the present application, as shown in Figures 1 to 4 The present application provides an air conditioner, which comprises a memory and a processor.

[0163] The memory and the processor complete mutual communication through a bus.

[0164] The memory stores computer instructions capable of running on the processor.

[0165] When the processor calls the computer instructions, the above-mentioned control method for defrosting of the air conditioner can be executed.

[0166] Figure 5 An example of a schematic diagram of the physical structure of an electronic device is shown in Figure 5 The electronic device can include a processor 810, a communications interface 820, a memory 830 and a communications bus 840, wherein the processor 810, the communications interface 820 and the memory 830 complete mutual communication through the communications bus 840. The processor 810 can call logical instructions in the memory 830 to execute the control method for defrosting of the air conditioner.

[0167] It should be noted that the electronic device in the embodiment can be a server, a PC or other devices, as long as it includes a processor 810, a communications interface 820, a memory 830 and a communications bus 840 as shown in Figure 5 , wherein the processor 810, the communications interface 820 and the memory 830 complete mutual communication through the communications bus 840, and the processor 810 can call logical instructions in the memory 830 to execute the above-mentioned method. The embodiment does not limit the specific implementation form of the electronic device.

[0168] The server can be a single server or a server group. The server group can be centralized or distributed (for example, the server can be a distributed system).

[0169] In a possible embodiment, the server can be local or remote with respect to the terminal. For example, the server can access information stored in the user terminal, the database, or any combination thereof via a network.

[0170] As another example, the server can be directly connected to at least one of the user terminal and the database to access information and / or data stored therein.

[0171] In a possible embodiment, the server can be implemented on a cloud platform; for example only, the cloud platform can include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an inter-cloud, a multi-cloud, etc., or any combination thereof.

[0172] In a possible embodiment, the server and the user terminal can be implemented on an electronic device having one or more components in the embodiments of the present application.

[0173] Further, the network can be used for exchange of information and / or data.

[0174] In a possible embodiment, one or more components in the interaction scenario (e.g., the server, the user terminal, and the database) can send information and / or data to other components.

[0175] In a possible embodiment, the network can be any type of wired or wireless network, or a combination thereof. For example only, the network can include a wired network, a wireless network, a fiber optic network, a telecommunication network, an intranet, the Internet, a Local Area Network (LAN), a Wide Area Network (WAN), a wireless local area network (WLAN), a Metropolitan Area Network (MAN), a Wide Area Network (WAN), a Public Switched Telephone Network (PSTN), a Bluetooth network, a ZigBee network, or a Near Field Communication (NFC) network, etc., or any combination thereof.

[0176] In possible embodiments, the network can include one or more network access points. For example, the network can include wired or wireless network access points, such as base stations and / or network switching nodes, through which one or more components of the interactive scenario can connect to the network to exchange data and / or information.

[0177] In addition, the logical instructions in the memory 830 described above can be implemented in the form of a software function unit and sold or used as an independent product, and can be stored in a computer readable storage medium.

[0178] Based on such understanding, the technical solutions of the present application, in essence or the part that contributes to the prior art, or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the various embodiment methods of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0179] In possible embodiments, the embodiments of the present application further provide a non-transitory computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the control method for defrosting of an air conditioner provided by the above-mentioned embodiments.

[0180] In possible embodiments, the embodiments of the present application further provide a computer program product, the computer program product including a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions that, when executed by a computer, enable the computer to perform the method provided by the above-mentioned method embodiments.

[0181] The above-described device embodiments are only schematic, and units illustrated as separate components can or can not be physically separate, and components illustrated as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment. Those skilled in the art can understand and implement without creative labor.

[0182] Those skilled in the art can clearly understand the technical solutions of the various embodiments from the above description of the embodiments, and the various embodiments can be implemented by means of software with the necessary general hardware platforms, and of course can also be implemented by hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part of the prior art that makes a contribution, can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, and the like, and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods of the various embodiments or some parts of the embodiments.

[0183] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method for defrosting of an air conditioner, characterized by, The air conditioner comprises a heat exchanger (10) of the air conditioner, which is provided with a plurality of parallel heat exchange units (11), and each heat exchange unit (11) is provided with an electronic expansion valve (20) on the upstream side; The method comprises: Based on the air conditioner being in a heating mode, an outdoor environment parameter and a first heat exchange parameter of each heat exchange unit (11) are obtained, the outdoor environment parameter at least includes the temperature of the environment where the air conditioner is located, and the first heat exchange parameter at least includes the temperature of the refrigerant flow path of the heat exchange unit (11) and the opening degree of the electronic expansion valve (20); Based on the outdoor environment parameter and the first heat exchange parameter, a control strategy is generated, which at least includes adjusting the opening degree of the electronic expansion valve (20) and the rotating speed of the outdoor unit fan; When the air conditioner is in the heating mode, the heat exchange unit (11) is defrosted without shutdown based on the control strategy.

2. The control method for defrosting an air conditioner according to claim 1, wherein, The step of obtaining the first heat exchange parameter of each heat exchange unit (11) specifically comprises: The first heat exchange temperature and the second heat exchange temperature of each heat exchange unit (11) are obtained, the first heat exchange temperature is the refrigerant temperature between the electronic expansion valve (20) and the heat exchange unit (11), and the second heat exchange temperature is the refrigerant temperature at the outlet end of the heat exchange unit (11); The first heat exchange parameter is generated based on the first heat exchange temperature and the second heat exchange temperature.

3. The control method for defrosting an air conditioner according to claim 2, wherein The step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically comprises: When the outdoor temperature identified by the outdoor environment parameter is less than a first preset outdoor temperature, and the first heat exchange parameter indicates that the heat exchanger (10) is in a defrosting standby state, a control strategy is generated to switch the air conditioner from the heating mode to a normal defrosting mode.

4. The control method for defrosting an air conditioner according to claim 2, wherein The step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically further comprises: When the outdoor temperature identified by the outdoor environment parameter is greater than or equal to a first preset outdoor temperature and less than a second preset outdoor temperature, the first heat exchange temperature is obtained; When the first heat exchange temperature is less than or equal to a first preset heat exchange temperature, a first duration is obtained, the first duration is the duration that the heat exchange unit (11) continues at the first heat exchange temperature, and the first preset heat exchange temperature is less than or equal to a defrosting target temperature value, the defrosting target temperature value is a function value output by a defrosting target function constructed based on the outdoor environment parameter; When the first duration is greater than or equal to a preset duration, the control strategy of adjusting the electronic expansion valve (20) corresponding to the heat exchange unit (11) to a closed state is generated.

5. The control method for defrosting an air conditioner according to claim 2, wherein The step of generating the control strategy based on the outdoor environment parameter and the first heat exchange parameter specifically further comprises: When the outdoor temperature identified by the outdoor environment parameter is greater than or equal to a second preset outdoor temperature, the first heat exchange temperature is obtained; When the first heat exchange temperature is less than or equal to a second preset heat exchange temperature, a second duration is obtained, the second duration is the duration that the heat exchange unit (11) continues at the first heat exchange temperature; Generate the control strategy of adjusting the electronic expansion valve (20) corresponding to the heat exchange unit (11) to the closed state based on the second duration being greater than or equal to the preset duration.

6. The control method for defrosting of an air conditioner according to claim 4 or 5, characterized in that, The step of generating the control strategy of adjusting the electronic expansion valve (20) corresponding to the heat exchange unit (11) to the closed state specifically further comprises: Based on the number of heat exchange units (11) to be adjusted to the state of the electronic expansion valve (20) being greater than or equal to a preset number, a preset number of each heat exchange unit (11) to be adjusted is obtained. Based on the preset number sequence, the electronic expansion valve (20) corresponding to the heat exchange unit (11) is adjusted to the closed state in sequence.

7. The control method for defrosting of an air conditioner according to any one of claims 2 to 5, characterized in that, The step of performing non-stop defrosting of the heat exchange unit (11) based on the control strategy specifically comprises: Under the condition that the heat exchange unit (11) is in non-stop defrosting, the electronic expansion valve (20) corresponding to the heat exchange unit (11) is adjusted to the closed state, and the rotation speed of the outdoor fan is adjusted to a preset rotation speed, which is greater than the rotation speed of the outdoor fan in the heating mode. Based on the duration of the heat exchange unit (11) performing non-stop defrosting lasting for a third duration, the electronic expansion valve (20) corresponding to the heat exchange unit (11) is adjusted to an initial state, and the initial state is the opening degree of the electronic expansion valve (20) of the heat exchange unit (11) before entering defrosting.

8. The control method for defrosting an air conditioner according to claim 7, wherein, The step of adjusting the electronic expansion valve (20) corresponding to the heat exchange unit (11) to the initial state specifically further comprises: Based on the electronic expansion valve (20) corresponding to the heat exchange unit (11) being adjusted to the initial state, a third preset heat exchange temperature and an instantaneous superheat degree are obtained, the third preset heat exchange temperature is a target superheat temperature after the heat exchange unit (11) undergoes non-stop defrosting, and the instantaneous superheat degree is a temperature value determined based on the first heat exchange temperature and the second heat exchange temperature. Based on the instantaneous superheat degree satisfying the third preset heat exchange temperature, the real-time opening degree of the electronic expansion valve (20) corresponding to the heat exchange unit (11) is adjusted.

9. The control method for defrosting of an air conditioner according to any one of claims 2 to 5, characterized in that, The step of performing non-stop defrosting of the heat exchange unit (11) based on the control strategy specifically comprises: Under the condition that the heat exchange unit (11) is in non-stop defrosting, the second heat exchange parameter of the remaining heat exchange units (11) is obtained in real time. When the second heat exchange parameter indicates that the corresponding heat exchange unit (11) is in a defrosting state, a first frosting time and a second frosting time are obtained, the first frosting time is the time when the heat exchange unit (11) corresponding to the first heat exchange parameter enters the defrosting state, and the second frosting time is the time when the heat exchange unit (11) corresponding to the second heat exchange parameter enters the defrosting state. Based on the difference between the first frosting time and the second frosting time being less than or equal to a preset interval threshold, the heat exchange unit (11) is defrosted in the current defrosting order. Based on the difference between the first frosting time and the second frosting time being greater than a preset interval threshold, a first heat exchange temperature of all the heat exchange units (11) requiring non-stop defrosting is obtained, and the heat exchange units (11) are defrosted without stopping according to the temperature values corresponding to all the first heat exchange temperatures.

10. A control device for defrosting of an air conditioner, characterized by, The air conditioner comprises heat exchangers (10) of the air conditioner, which are provided with a plurality of parallel heat exchange units (11), and each heat exchange unit (11) is provided with an electronic expansion valve (20) on the upstream side. The device comprises: A parameter acquisition module (100) is configured to acquire outdoor environment parameters and first heat exchange parameters of each heat exchange unit (11) based on the air conditioner being in a heating mode, wherein the outdoor environment parameters at least include the temperature of the environment where the air conditioner is located, and the first heat exchange parameters at least include the temperature of the refrigerant flow path of the heat exchange unit (11) and the opening degree of the electronic expansion valve (20); A strategy generation module (110) is configured to generate a control strategy based on the outdoor environment parameters and the first heat exchange parameters, wherein the control strategy at least includes adjusting the opening degree of the electronic expansion valve (20) and the rotating speed of the outdoor unit fan; A strategy execution module (120) is configured to defrost the heat exchange units (11) without stopping based on the control strategy when the air conditioner is in the heating mode.

11. An air conditioner characterized by comprising: It comprises: A memory and a processor; The memory and the processor communicate with each other through a bus; The memory stores computer instructions that can run on the processor; When the processor calls the computer instructions, it can execute the control method for air conditioner defrosting according to any one of claims 1 to 9.

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