Control method of air conditioner, air conditioner and storage medium

Abstract

The invention discloses a control method of an air conditioner, the air conditioner and a storage medium. The air conditioner comprises an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger which are sequentially connected, a water collecting device is arranged below the outdoor heat exchanger, and a pipeline between the indoor heat exchanger and the electronic expansion valve is in heat exchange connection with the water collecting device. The air conditioner is controlled to operate in a heating mode, and state parameters representing the freezing risk of the water collecting device are obtained; when the state parameters reach preset conditions, an electronic expansion valve and / or an indoor fan corresponding to an indoor heat exchanger and / or an outdoor fan corresponding to an outdoor heat exchanger are / is controlled to operate so as to melt frost of a water collecting device; wherein the preset condition shows that the water collecting device is frozen. The deicing timeliness of the outdoor heat exchanger water collecting device after defrosting of the air conditioner is improved, and normal operation of the air conditioner is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control method of an air conditioner, an air conditioner and a storage medium. Background Art

[0002] A water collection device is installed under the heat exchanger that serves as the evaporator in the air conditioner to collect the condensed water from the evaporator. Some air conditioners (such as window air conditioners, etc.) have a section of refrigerant pipe between the indoor and outdoor heat exchangers installed in the water collection device. When the air conditioner is running in heating mode, the refrigerant that condenses through the indoor heat exchanger prevents the water collection device from freezing.

[0003] However, during the heating operation, the air conditioner needs to switch to the defrost operation. During the defrost operation, the low-temperature refrigerant after evaporation from the indoor heat exchanger flows through the water collection device and is prone to freezing. When the air conditioner exits the defrost operation, the condensed water generated by the outdoor heat exchanger falls into the frozen water collection device and cannot be discharged in time, causing water overflow from the outdoor unit, affecting the normal operation of the air conditioner. Summary of the invention

[0004] The main purpose of the present invention is to provide a control method for an air conditioner, an air conditioner and a storage medium, aiming to improve the timeliness of defrosting of an outdoor heat exchanger water collecting device after defrosting of the air conditioner and ensure the normal operation of the air conditioner.

[0005] To achieve the above object, the present invention provides a control method for an air conditioner, wherein the air conditioner comprises an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger which are connected in sequence, a water collecting device is arranged below the outdoor heat exchanger, and a pipeline between the indoor heat exchanger and the electronic expansion valve is connected to the water collecting device for heat exchange, and the control method for the air conditioner comprises the following steps:

[0006] When the air conditioner exits the defrosting mode, controlling the air conditioner to operate in the heating mode, and obtaining a state parameter representing the freezing risk of the water collection device;

[0007] When the state parameter reaches a preset condition, the electronic expansion valve and / or the indoor fan corresponding to the indoor heat exchanger and / or the outdoor fan corresponding to the outdoor heat exchanger are controlled to operate to melt the frost of the water collection device;

[0008] Wherein, the preset condition indicates that the water collection device is frozen.

[0009] Optionally, when the state parameter reaches a preset condition, the step of controlling the electronic expansion valve and / or the indoor fan corresponding to the indoor heat exchanger and / or the outdoor fan corresponding to the outdoor heat exchanger to operate to melt the frost of the water collection device includes:

[0010] When the state parameter reaches the preset condition, controlling the indoor fan to be turned off;

[0011] When the temperature of the indoor heat exchanger is greater than or equal to a first temperature threshold, controlling the indoor fan and / or the outdoor fan and / or the electronic expansion valve to operate so as to increase the temperature of the water collection device;

[0012] Wherein, the first temperature threshold is greater than the cold wind protection temperature of the indoor heat exchanger in the heating mode.

[0013] Optionally, the step of controlling the indoor fan to operate to increase the temperature of the water collection device includes:

[0014] The indoor fan is controlled to start and the rotation speed is adjusted so that the temperature of the indoor heat exchanger reaches a second temperature threshold, and the second temperature threshold is greater than the first temperature threshold.

[0015] Optionally, the step of controlling the outdoor fan to operate to increase the temperature of the water collection device includes:

[0016] The outdoor fan is controlled to reduce its rotation speed.

[0017] Optionally, the step of controlling the operation of the electronic expansion valve to increase the temperature of the water collecting device comprises:

[0018] The electronic expansion valve is controlled to increase its opening degree.

[0019] Optionally, the air conditioner further comprises a compressor, a flash evaporator and an air supply branch, the air supply branch is provided with a refrigerant valve, the indoor heat exchanger and the outdoor heat exchanger are respectively connected to the exhaust port of the compressor and the return port of the compressor, one end of the air supply branch is connected to the air supply port of the compressor, the other end of the air supply branch, the electronic expansion valve and the outdoor heat exchanger are connected via the flash evaporator, and the control method of the air conditioner further comprises:

[0020] When the air conditioner operates in a heating mode, the refrigerant valve is controlled to open.

[0021] Optionally, after the step of controlling the air conditioner to operate in a heating mode and acquiring a state parameter characterizing the freezing risk of the water collection device when the air conditioner exits the defrost mode, the method further includes:

[0022] When the state parameter reaches a preset condition, start timing and execute the step of controlling the electronic expansion valve and / or the indoor fan corresponding to the indoor heat exchanger and / or the outdoor fan corresponding to the outdoor heat exchanger to operate to melt the frost of the water collection device;

[0023] When the timing duration is greater than or equal to the target ice-melting duration, the drainage device of the water collection device is controlled to open.

[0024] Optionally, before starting the timing, the method further includes:

[0025] When the state parameter reaches a preset condition, the target defrosting time is determined according to the outdoor ambient temperature corresponding to the air conditioner, and the target defrosting time is negatively correlated with the outdoor ambient temperature.

[0026] Optionally, the preset condition includes that the outdoor ambient temperature is lower than a preset ambient temperature.

[0027] In addition, in order to achieve the above-mentioned purpose, the present application also proposes an air conditioner, which includes a refrigerant circuit and a control device;

[0028] The refrigerant circuit includes an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger connected in sequence, a water collecting device is arranged below the outdoor heat exchanger, a pipeline between the indoor heat exchanger and the electronic expansion valve is connected to the water collecting device for heat exchange, an indoor fan is arranged corresponding to the indoor heat exchanger, and an outdoor fan is arranged corresponding to the outdoor heat exchanger;

[0029] The electronic expansion valve, the indoor fan and the outdoor fan are all connected to the control device, which includes: a memory, a processor and an air conditioner control program stored in the memory and executable on the processor, and the air conditioner control program, when executed by the processor, implements the steps of the air conditioner control method as described in any one of the above items.

[0030] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of an air conditioner is stored. When the control program of the air conditioner is executed by a processor, the steps of the control method of the air conditioner as described in any of the above items are implemented.

[0031] The present invention proposes a control method for an air conditioner. When the air conditioner exits the defrost mode, the method detects that a water collection device is frozen through a state parameter during the operation of the air conditioner in the heating mode. The frost in the water collection device is melted by controlling the operation of an electronic expansion valve and / or an outdoor fan and / or an indoor fan. This ensures that the air conditioner can quickly melt the frost in the outdoor water collection device after the defrost mode is in the air conditioner, and ensures that the water collection device can effectively collect condensed water generated by the outdoor heat exchanger during the heating operation of the air conditioner, and the outdoor unit will not overflow, thereby improving the timeliness of the ice-melting of the water collection device of the outdoor heat exchanger after the air conditioner is defrosted, and ensuring the normal operation of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a refrigerant system of an air conditioner according to an embodiment of the present invention;

[0033] Figure 2A schematic diagram of the hardware structure involved in the operation of an air conditioner according to an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of a flow chart of an embodiment of a method for controlling an air conditioner according to the present invention;

[0035] Figure 4 A flow chart of another embodiment of a method for controlling an air conditioner according to the present invention;

[0036] Figure 5 The figure is a flow chart of another embodiment of the air conditioner control method of the present invention.

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0039] The embodiment of the present invention provides an air conditioner. In this embodiment, the air conditioner is a window air conditioner. In other embodiments, the air conditioner may also be other types of air conditioners, such as a cabinet air conditioner, a wall-mounted air conditioner, a ceiling air conditioner, etc.

[0040] In the embodiment of the present invention, refer to Figure 1 and Figure 2 The air conditioner includes a control device 100 and a refrigerant circuit, the refrigerant circuit includes a compressor 1, an indoor heat exchanger 2, an electronic expansion valve 3, an outdoor heat exchanger 4 and a reversing assembly 5, the indoor heat exchanger 2, the electronic expansion valve 3 and the outdoor heat exchanger 4 are connected in sequence, and the indoor heat exchanger 2 and the outdoor heat exchanger 4 are respectively connected to the exhaust port of the compressor 1 and the return air port of the compressor 1. The pipeline between the indoor heat exchanger 2 and the electronic expansion valve 3 includes a heat exchange pipe 6, and the heat exchange pipe 6 is connected to the water collection device for heat exchange. Among them, the outdoor heat exchanger 4 is correspondingly provided with an outdoor fan 401, and the indoor heat exchanger 2 is correspondingly provided with an indoor fan 201. The electronic expansion valve 3, the compressor 1, the outdoor fan 401, the indoor fan 201 and the reversing assembly 5 are all connected to the control device 100.

[0041] In this embodiment, the water collecting device is a water receiving pan arranged below the outdoor heat exchanger 4, the water receiving pan is provided with a drain port, and the heat exchange tube 6 is installed in the water receiving pan and contacts the bottom wall of the water receiving pan. The heat exchange tube 6 is arranged in a serpentine shape. The refrigerant flowing between the indoor heat exchanger 2 and the electronic expansion valve 3 can exchange heat with the water collecting device when flowing through the heat exchange tube 6.

[0042] The exhaust port of the compressor 1, the return port of the compressor 1, the indoor heat exchanger 2 and the outdoor heat exchanger 4 are all connected to the reversing component 5. In this embodiment, the reversing component 5 is a four-way valve. In other embodiments, the reversing component 5 may also include one or more refrigerant regulating components with the same flow direction switching function.

[0043] The reversing assembly 5 has a first operating state and a second operating state. When the reversing assembly 5 operates in the first operating state, the exhaust port of the compressor 1 is connected to the indoor heat exchanger 2, and the return air port of the compressor 1 is connected to the outdoor heat exchanger 4; when the reversing assembly 5 operates in the second operating state, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 4, and the return air port of the compressor 1 is connected to the indoor heat exchanger 2.

[0044] The operation mode of the air conditioner in this embodiment is described in detail below:

[0045] In the first mode, such as the heating mode, the reversing assembly 5 operates in the first operating state, and the refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 2, the electronic expansion valve 3, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1, wherein the indoor heat exchanger 2 is in a condensing state and the outdoor heat exchanger 4 is in an evaporating state. The refrigerant flowing out of the indoor heat exchanger 2 after condensation can release heat into the water collection device when flowing through the water collection device to increase the temperature of the water collection device.

[0046] In the second mode, such as the cooling mode or the defrosting mode, the reversing assembly 5 operates in the second operating state, and the refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 4, the electronic expansion valve 3, and the indoor heat exchanger 2 in sequence and then flows back to the compressor 1, wherein the indoor heat exchanger 2 is in an evaporating state and the outdoor heat exchanger 4 is in a condensing state. When the indoor air needs to be regulated, it can exchange heat with the indoor heat exchanger 2 to reduce the indoor air temperature and humidity. When the outdoor unit is frosted, the outdoor heat exchanger 4 can release heat to melt the frost of the outdoor unit.

[0047] Furthermore, the air conditioner further comprises a flash evaporator 7 and an air supply branch. The air supply branch is provided with a refrigerant valve 8, the indoor heat exchanger 2 and the outdoor heat exchanger 4 are respectively connected to the exhaust port of the compressor 1 and the return port of the compressor 1, the first end of the air supply branch is connected to the air supply port of the compressor 1, and the other end of the air supply branch, the electronic expansion valve 3 and the outdoor heat exchanger 4 are connected via the flash evaporator 7.

[0048] In this embodiment, the refrigerant valve 8 is a solenoid valve. In other embodiments, the refrigerant valve 8 may also be other refrigerant regulating components with adjustable opening, such as an electronic expansion valve 3.

[0049] The flash evaporator 7 has a first refrigerant port, a second refrigerant port and a gas phase outlet, the electronic expansion valve 3 is connected to the first refrigerant port, the outdoor heat exchanger 4 is connected to the second refrigerant port, and the air supply port of the compressor 1 is connected to the other end of the refrigerant branch. The refrigerant flowing into the flash evaporator 7 can be separated into gas and liquid. When the refrigerant valve 8 is opened, the gas phase refrigerant in the flash evaporator 7 can flow through the air supply branch from the air supply port into the compressor 1 to supply air to the compressor 1 and increase enthalpy.

[0050] Furthermore, the water collection device is also provided with a drainage device 01, and the drainage device 01 is connected to the control device 100. The drainage device 01 may include a drainage valve provided at the drainage port of the water collection device and / or a drainage pump provided at a drainage pipe connected to the water collection device. When the drainage device 01 is opened, the water in the water collection device can be discharged to the outside.

[0051] Furthermore, the air conditioner further comprises a temperature sensor 02, which is arranged on the indoor heat exchanger 2 and connected to the control device 100. The temperature sensor 02 is used to detect the temperature of the indoor heat exchanger 2.

[0052] Furthermore, the air conditioner further comprises an environment detection module 03, and the environment detection module 03 is connected to the control device 100. The environment detection module 03 can be arranged in an outdoor environment to detect the outdoor environment temperature.

[0053] In the embodiment of the present invention, refer to Figure 2 The control device 100 of the air conditioner includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0054] Those skilled in the art will understand that Figure 2 The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0055] like Figure 2 As shown, the memory 1002 as a computer storage medium may include a control program for the air conditioner.

[0056] exist Figure 2 In the device shown, the processor 1001 can be used to call the air conditioner control program stored in the memory 1002 and execute the relevant steps of the air conditioner control method in the following embodiments.

[0057] The embodiment of the present invention further provides a control method of an air conditioner, which is applied to the above-mentioned air conditioner.

[0058] Reference Figure 3 , an embodiment of a control method of an air conditioner of the present application is proposed. In this embodiment, the control method of the air conditioner includes:

[0059] Step S10, when the air conditioner exits the defrost mode, controlling the air conditioner to operate in the heating mode, and obtaining a state parameter representing the freezing risk of the water collection device;

[0060] When the air conditioner is operating in heating mode, the environmental parameters of the environment in which it is located and / or the operating status parameters of the air conditioner itself can be detected. When the detected parameters meet the conditions required for frosting of the outdoor unit, the air conditioner can be controlled to enter defrost mode.

[0061] When the air conditioner operates in heating mode, the reversing component operates in the first operating state, and the refrigerant discharged from the compressor flows through the indoor heat exchanger, the electronic expansion valve, and the outdoor heat exchanger in sequence and then flows back to the compressor. Among them, the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state.

[0062] When the air conditioner operates in defrost mode, the reversing component operates in the second operating state. The refrigerant discharged from the compressor flows through the outdoor heat exchanger, the electronic expansion valve, and the indoor heat exchanger in sequence and then flows back to the compressor. Among them, the indoor heat exchanger is in an evaporating state and the outdoor heat exchanger is in a condensing state. The outdoor heat exchanger can release heat to melt the frost formed on the outdoor unit.

[0063] The state parameters here may include environmental parameters of the environment where the air conditioner is located and / or parameters of the operating state parameters of the air conditioner itself that are related to the risk of freezing of the water collection device.

[0064] The state parameter may characterize the risk of freezing of the water collection device. In this embodiment, the state parameter includes the outdoor ambient temperature. In other embodiments, the state parameter may also include the temperature of the liquid storage chamber of the water collection device and / or the temperature difference before and after the refrigerant flows into the water collection device, etc.

[0065] In this embodiment, the preset condition includes that the outdoor ambient temperature is lower than the preset ambient temperature, which can accurately reflect the risk of freezing of the outdoor water collection device after the defrost mode.

[0066] The air conditioner may first switch from the defrost mode to the heating mode, and detect the state parameters in the heating mode. Alternatively, the air conditioner may first detect the state parameters and then switch to the state parameters when the defrost mode ends. Alternatively, the air conditioner may detect the state parameters while switching from the defrost mode to the heating mode.

[0067] Step S20, when the state parameter reaches a preset condition, control the electronic expansion valve and / or the indoor fan corresponding to the indoor heat exchanger and / or the outdoor fan corresponding to the outdoor heat exchanger to operate to melt the frost on the water collection device; wherein the preset condition indicates that the water collection device is frozen.

[0068] The preset conditions include a target parameter range that the state parameter of the water collection device needs to reach when it is frozen or a target relationship that the relationship between the state parameter and the preset parameter needs to reach.

[0069] When the water collection device is frozen, the drain outlet will be blocked. During the initial stage when the air conditioner switches from defrost mode to heating mode, conventional heating control will be used, which will cause the water in the water collection device to be unable to drain away.

[0070] When the state parameter reaches the preset condition, it indicates that the water collection device is frozen. At this time, the frost of the water collection device can be melted by the operation of the electronic expansion valve and / or the indoor fan and / or the outdoor fan; when the state parameter does not reach the preset condition, it indicates that the water collection device is not frozen. At this time, the electronic expansion valve and / or the indoor fan and / or the outdoor fan can be operated according to the conventional heating. Among them, when the state parameter reaches the preset condition, the heat released by the refrigerant to the water collection device under the control of the above-mentioned components in the de-icing operation is greater than the heat released by the refrigerant to the water collection device under the conventional heating control of the above-mentioned components when the state parameter does not reach the preset condition.

[0071] When the status parameters reach the preset conditions, the electronic expansion valve and / or the outdoor fan and / or the indoor fan can operate with fixed defrosting parameters until the frost in the water collection device melts; the electronic expansion valve and / or the outdoor fan and / or the indoor fan can also operate with different defrosting parameters in stages until the frost in the water collection device melts.

[0072] When the state parameters reach the preset conditions, the parameters of the electronic expansion valve and / or the outdoor fan and / or the indoor fan during the defrosting operation can be pre-set fixed parameters, or can be parameters determined according to the actual operating state of the air conditioner, for example, according to the state parameters and / or the high pressure of the air conditioner and / or the low pressure of the air conditioner and / or the air supply temperature of the compressor, etc. Among them, determining the parameters during the defrosting operation according to the state parameters is conducive to improving the ice melting efficiency of the water collection device; determining the parameters during the defrosting operation according to the high pressure and / or the low pressure is conducive to improving the operating stability of the air conditioner; determining the parameters during the defrosting operation according to the air supply temperature is conducive to improving the energy efficiency of the air conditioner.

[0073] When the state parameters reach the preset conditions, the operating opening of the electronic expansion valve may be greater than the conventional heating opening of the electronic expansion valve; the operating speed of the outdoor fan may be lower than the conventional heating speed of the outdoor fan; the operating state of the indoor fan may be lower than the conventional heating speed of the outdoor fan.

[0074] A control method for an air conditioner is proposed in an embodiment of the present invention. When the air conditioner exits the defrost mode, if the state parameters are used to detect that a water collection device is frozen during the operation of the air conditioner in the heating mode, the frost in the water collection device is melted by controlling the operation of the electronic expansion valve and / or the outdoor fan and / or the indoor fan. This ensures that the air conditioner can quickly melt the frost in the outdoor water collection device after the defrost mode is selected, and that the water collection device can effectively collect condensed water generated by the outdoor heat exchanger during the heating operation of the air conditioner, and that the outdoor unit will not overflow. This improves the timeliness of the ice-melting of the water collection device of the outdoor heat exchanger after the air conditioner is defrosted, and ensures the normal operation of the air conditioner.

[0075] Furthermore, based on the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed.

[0076] In this embodiment, refer to Figure 4 , the step S20 comprises:

[0077] Step S21, when the state parameter reaches the preset condition, controlling the indoor fan to be turned off;

[0078] When the indoor fan is turned off, the temperature of the indoor heat exchanger can be detected to identify whether the temperature of the indoor heat exchanger is greater than or equal to a first temperature threshold. When the temperature of the indoor heat exchanger is less than the first temperature threshold, the indoor fan can be controlled to remain in the off state.

[0079] In this embodiment, during the process of shutting down the indoor fan, the outdoor fan and / or the compressor and / or the electronic expansion valve and / or the refrigerant valve on the air supply branch can be controlled to be regulated according to the conventional heating operation. In other embodiments, the outdoor fan can also be operated at a speed lower than the speed of the conventional heating operation and / or the compressor can be operated at a frequency higher than the frequency of the conventional heating operation and / or the electronic expansion valve can be operated at a larger opening than the opening of the conventional heating operation and / or the refrigerant valve on the air supply branch can be operated at a larger opening than the opening of the conventional heating operation.

[0080] Step S22, when the temperature of the indoor heat exchanger is greater than or equal to a first temperature threshold, control the indoor fan and / or the outdoor fan and / or the electronic expansion valve to operate to increase the temperature of the water collection device; wherein the first temperature threshold is greater than the cold wind protection temperature of the indoor heat exchanger in the heating mode.

[0081] The cold wind prevention temperature is specifically the minimum temperature that the indoor heat exchanger needs to reach when the indoor fan is allowed to turn on after the air conditioner starts the heating mode in advance.

[0082] The first temperature threshold can be a pre-set fixed threshold, or it can be a value obtained by increasing the cold wind protection temperature according to the actual operation of the air conditioner. For example, the temperature adjustment value can be determined according to the operation time of the air conditioner in the defrost mode to increase the cold wind protection temperature to obtain the first temperature threshold, and so on.

[0083] In this embodiment, at least one of the indoor fan, the outdoor fan and the electronic expansion valve can adjust operating parameters so that the current temperature of the water collection device is higher than the temperature of the water collection device when the temperature of the indoor heat exchanger does not reach the first temperature threshold.

[0084] In this embodiment, the step of controlling the indoor fan to increase the temperature of the water collection device includes: controlling the indoor fan to start and adjusting the speed so that the temperature of the indoor heat exchanger reaches a second temperature threshold, and the second temperature threshold is greater than the first temperature threshold. The second temperature threshold is a target temperature value of the indoor heat exchanger that can achieve rapid melting of frost in the outdoor water collection device while the air conditioner can maintain reliable operation. The second temperature threshold can be a preset fixed value, or it can be determined according to the actual operation of the air conditioner. Specifically, the second temperature threshold here can be determined according to the above-mentioned state parameters and / or the high pressure of the air conditioner and / or the low pressure of the air conditioner and / or the air supply temperature of the compressor, etc. When the indoor fan is turned on, the temperature of the indoor heat exchanger can be detected in real time. When it is detected that the temperature of the indoor heat exchanger is greater than the second temperature threshold, the indoor fan can be controlled to increase the speed of operation; when it is detected that the temperature of the indoor heat exchanger is less than the second temperature threshold, the indoor fan can be controlled to reduce the speed of operation.

[0085] In this embodiment, the step of controlling the outdoor fan to increase the temperature of the water collection device includes: controlling the outdoor fan to reduce the rotation speed. In one implementation of this embodiment, the outdoor fan is controlled to reduce the rotation speed to a preset defrosting speed. In another implementation of this embodiment, the rotation speed adjustment value can be determined according to the actual operation state of the air conditioner, and the current rotation speed of the outdoor fan can be reduced according to the rotation speed adjustment value. For example, the rotation speed adjustment value here can be determined according to the above-mentioned state parameters and / or the high pressure of the air conditioner and / or the low pressure of the air conditioner and / or the air supply temperature of the compressor.

[0086] In this embodiment, the step of controlling the operation of the electronic expansion valve to increase the temperature of the water collection device includes: controlling the electronic expansion valve to increase the opening degree. In one implementation of this embodiment, the electronic expansion valve is controlled to increase to a preset defrosting opening degree. In another implementation of this embodiment, the opening adjustment value can be determined according to the actual operating state of the air conditioner, and the current opening of the electronic expansion valve can be increased according to the opening adjustment value. For example, the opening adjustment value here can be determined according to the above-mentioned state parameters and / or the high pressure of the air conditioner and / or the low pressure of the air conditioner and / or the air supply temperature of the compressor.

[0087] In this embodiment, when the temperature of the indoor heat exchanger is greater than or equal to the first temperature threshold, the indoor fan is controlled to start and adjust the speed so that the temperature of the indoor heat exchanger reaches the second temperature threshold, the outdoor fan is controlled to reduce the speed, and the electronic expansion valve is controlled to increase the opening degree. In other embodiments, when the temperature of the indoor heat exchanger is greater than or equal to the first temperature threshold, the indoor fan is controlled to start and adjust the speed so that the temperature of the indoor heat exchanger reaches the second temperature threshold, and the outdoor fan and the electronic expansion valve maintain the current operating parameters; or, when the temperature of the indoor heat exchanger is greater than or equal to the first temperature threshold, the electronic expansion valve is controlled to increase the opening degree, and the indoor fan and the outdoor fan maintain the current operating parameters.

[0088] In this embodiment, the defrosting process of the water collection device is controlled in stages. In the first stage, the indoor fan is turned off and a first temperature threshold that is higher than the cold air protection temperature during conventional heating is used to limit the opening of the indoor fan. This is beneficial to quickly increase the overall heat of the system. When the temperature of the indoor heat exchanger reaches the first temperature threshold, the heat of the water collection device is further increased by operating and regulating the indoor fan and / or outdoor fan and / or the electronic expansion valve, thereby ensuring that there is enough heat to quickly melt the frost in the outdoor water collection device at the end of defrosting, further effectively improving the timeliness of the defrosting of the outdoor heat exchanger water collection device after defrosting the air conditioner, and ensuring the normal operation of the air conditioner.

[0089] In other embodiments, the step of controlling the indoor fan to operate to increase the temperature of the water collecting device may include: controlling the indoor fan to remain closed.

[0090] In other embodiments, the step of controlling the outdoor fan to operate to increase the temperature of the water collecting device may include: controlling the outdoor fan to be turned off.

[0091] In other embodiments, the step of controlling the electronic expansion valve to operate to increase the temperature of the water collecting device may include: controlling the electronic expansion valve to operate at a maximum opening degree.

[0092] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, the air conditioner further includes a compressor, a flash evaporator and an air supply branch, the air supply branch is provided with a refrigerant valve, the indoor heat exchanger and the outdoor heat exchanger are respectively connected to the exhaust port of the compressor and the return port of the compressor, one end of the air supply branch is connected to the air supply port of the compressor, and the other end of the air supply branch, the electronic expansion valve and the outdoor heat exchanger are connected through the flash evaporator, and the control method of the air conditioner further includes:

[0093] When the air conditioner operates in a heating mode, the refrigerant valve is controlled to open.

[0094] Specifically, when the air conditioner starts the heating mode, the refrigerant valve is controlled to start, and during the operation of the heating mode, when the state parameter reaches a preset condition, the refrigerant valve maintains an open state.

[0095] In this embodiment, the refrigerant valve is a solenoid valve, and the solenoid valve maintains an open state when the state parameter reaches a preset condition. In other embodiments, the refrigerant valve is an expansion valve with adjustable opening, and when the state parameter reaches a preset condition, when the temperature of the indoor heat exchanger is less than the first temperature threshold, the opening of the expansion valve may be greater than the opening of the expansion valve when the temperature of the indoor heat exchanger is greater than or equal to the first temperature threshold.

[0096] In this embodiment, when the air conditioner is operating in the heating mode, the refrigerant valve on the air supply branch is opened to use the gaseous refrigerant separated by the flash evaporator to supply air to the compressor to increase enthalpy, thereby improving the heating output capacity of the compressor.

[0097] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. Figure 5 , after step S10, further comprising:

[0098] Step S201, when the state parameter reaches a preset condition, start timing and execute the step of controlling the electronic expansion valve and / or the indoor fan corresponding to the indoor heat exchanger and / or the outdoor fan corresponding to the outdoor heat exchanger to operate to melt the frost of the water collection device;

[0099] Step S30, when the timing duration is greater than or equal to the target ice-melting duration, the drainage device of the water collection device is controlled to open.

[0100] The target defrosting time may be a preset fixed time, or may be determined according to the actual operating conditions of the air conditioner.

[0101] The drainage device may include the above-mentioned drainage valve and / or drainage pump, etc. The drainage device may be operated at a preset fixed power (e.g., maximum power, etc.), or the operating power of the drainage device may be determined according to the timing duration and / or the operating duration of the air conditioner in the defrost mode and / or state parameters, and the drainage device may be controlled to open according to the operating power.

[0102] In this embodiment, after identifying that the outdoor water collection device is frozen, the drainage device is controlled to open to discharge the melted ice water in the water collection device, thereby further ensuring that the outdoor unit will not overflow after the defrost mode ends, thereby improving the stability of the air conditioner operation.

[0103] Furthermore, in this embodiment, when the state parameter reaches a preset condition, the target defrosting time is determined according to the outdoor ambient temperature corresponding to the air conditioner, and the target defrosting time is negatively correlated with the outdoor ambient temperature.

[0104] The outdoor ambient temperature can be detected by the above-mentioned environment detection module.

[0105] In one implementation of this embodiment, the outdoor ambient temperature may be substituted into a preset formula to calculate the target defrosting time.

[0106] In another implementation of this embodiment, different temperature intervals may correspond to different defrosting times, and the temperature interval in which the outdoor ambient temperature is located may be determined, and the defrosting time corresponding to the temperature interval may be used as the target defrosting time.

[0107] In this embodiment, the target defrosting time is determined according to the outdoor ambient temperature, which is beneficial to further ensure that the air conditioner can provide sufficient heat to melt the frost in the water collection device, thereby further improving the timeliness of the melting of frost in the water collection device after the defrost mode ends.

[0108] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program for an air conditioner is stored. When the control program for the air conditioner is executed by a processor, the relevant steps of any embodiment of the control method for the air conditioner are implemented.

[0109] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0110] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0111] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0112] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner comprises an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger which are connected in sequence, a water collecting device is arranged below the outdoor heat exchanger, a pipeline between the indoor heat exchanger and the electronic expansion valve is connected to the water collecting device for heat exchange, and the control method of the air conditioner comprises the following steps: When the air conditioner exits the defrosting mode, controlling the air conditioner to operate in the heating mode, and obtaining a state parameter representing the freezing risk of the water collection device; When the state parameter reaches a preset condition, the electronic expansion valve and / or the indoor fan corresponding to the indoor heat exchanger and / or the outdoor fan corresponding to the outdoor heat exchanger are controlled to operate to melt the frost of the water collection device; Wherein, the preset condition indicates that the water collection device is frozen.

2. The air conditioner control method according to claim 1, characterized in that: When the state parameter reaches a preset condition, the step of controlling the electronic expansion valve and / or the indoor fan corresponding to the indoor heat exchanger and / or the outdoor fan corresponding to the outdoor heat exchanger to operate to melt the frost of the water collection device includes: When the state parameter reaches the preset condition, controlling the indoor fan to be turned off; When the temperature of the indoor heat exchanger is greater than or equal to a first temperature threshold, controlling the indoor fan and / or the outdoor fan and / or the electronic expansion valve to operate so as to increase the temperature of the water collection device; Wherein, the first temperature threshold is greater than the cold wind protection temperature of the indoor heat exchanger in the heating mode.

3. The air conditioner control method according to claim 2, characterized in that: The step of controlling the indoor fan to operate to increase the temperature of the water collecting device comprises: The indoor fan is controlled to start and the rotation speed is adjusted so that the temperature of the indoor heat exchanger reaches a second temperature threshold, and the second temperature threshold is greater than the first temperature threshold.

4. The air conditioner control method according to claim 2, characterized in that: The step of controlling the outdoor fan to operate to increase the temperature of the water collecting device comprises: The outdoor fan is controlled to reduce its rotation speed.

5. The air conditioner control method according to claim 2, characterized in that: The step of controlling the operation of the electronic expansion valve to increase the temperature of the water collecting device comprises: The electronic expansion valve is controlled to increase its opening degree.

6. The air conditioner control method according to claim 1, characterized in that: The air conditioner further comprises a compressor, a flash evaporator and an air supply branch, the air supply branch is provided with a refrigerant valve, the indoor heat exchanger and the outdoor heat exchanger are respectively connected to the exhaust port of the compressor and the return port of the compressor, one end of the air supply branch is connected to the air supply port of the compressor, and the other end of the air supply branch, the electronic expansion valve and the outdoor heat exchanger are connected through the flash evaporator, and the control method of the air conditioner further comprises: When the air conditioner operates in a heating mode, the refrigerant valve is controlled to open.

7. The method for controlling an air conditioner according to any one of claims 1 to 6, characterized in that: After the step of controlling the air conditioner to operate in the heating mode and obtaining the state parameter representing the freezing risk of the water collecting device when the air conditioner exits the defrosting mode, the method further includes: When the state parameter reaches a preset condition, start timing and execute the step of controlling the electronic expansion valve and / or the indoor fan corresponding to the indoor heat exchanger and / or the outdoor fan corresponding to the outdoor heat exchanger to operate to melt the frost of the water collection device; When the timing duration is greater than or equal to the target ice-melting duration, the drainage device of the water collection device is controlled to open.

8. The air conditioner control method according to claim 7, characterized in that: Before the timing is started, it also includes: When the state parameter reaches a preset condition, the target defrosting time is determined according to the outdoor ambient temperature corresponding to the air conditioner, and the target defrosting time is negatively correlated with the outdoor ambient temperature.

9. The method for controlling an air conditioner according to any one of claims 1 to 6, characterized in that: The preset condition includes that the outdoor ambient temperature is lower than the preset ambient temperature.

10. An air conditioner, characterized in that: The air conditioner comprises a refrigerant circuit and a control device; The refrigerant circuit includes an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger connected in sequence, a water collecting device is arranged below the outdoor heat exchanger, a pipeline between the indoor heat exchanger and the electronic expansion valve is connected to the water collecting device for heat exchange, an indoor fan is arranged corresponding to the indoor heat exchanger, and an outdoor fan is arranged corresponding to the outdoor heat exchanger; The electronic expansion valve, the indoor fan and the outdoor fan are all connected to the control device, which includes: a memory, a processor and an air conditioner control program stored in the memory and executable on the processor, wherein the air conditioner control program implements the steps of the air conditioner control method as described in any one of claims 1 to 9 when executed by the processor.

11. A storage medium, characterized in that: The storage medium stores a control program of the air conditioner, and when the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner as described in any one of claims 1 to 9 are implemented.

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