Air conditioner defrosting method and device considering refrigerant state

Abstract

The invention discloses an air conditioner defrosting method and device considering the refrigerant state. The method comprises the steps that under the condition that the air conditioner operates in a heating mode, the thickness of a frost layer on the surface of an outdoor heat exchanger is obtained according to a first preset time interval; under the condition that the thickness of the frost layer reaches a first preset thickness threshold value, the liquid refrigerant content is obtained according to a second preset time interval; according to the content threshold range of the liquid refrigerant content, the preset gasification efficiency or the preset defrosting duration in the initial defrosting strategy is adjusted, and a target defrosting strategy is obtained; and the air conditioner is controlled to execute defrosting operation according to the target defrosting strategy till the thickness of the frost layer is smaller than a second preset thickness threshold value. The technical problem that in the related technology, when a hot gas bypass defrosting technology is adopted for defrosting, the situation that a liquid refrigerant possibly enters a compressor or the refrigerant is excessively gasified possibly exists, and consequently the defrosting efficiency of the air conditioner is poor is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliance control, and in particular to a defrosting method and device for an air conditioner taking into account the state of a refrigerant. Background Art

[0002] Hot gas bypass defrosting technology introduces high-temperature and high-pressure gas discharged from the compressor into the condenser for defrosting. It does not require additional heating elements and has a fast defrosting speed, so it is widely used in air conditioning and heat pump systems. However, during the defrosting process, the high-temperature gas on the surface of the condenser may condense into liquid refrigerant, and the incompletely evaporated liquid refrigerant enters the compressor, causing liquid hammer problems, which not only seriously affects the operating reliability and life of the compressor, but also causes the defrosting effect of the air conditioner to deteriorate.

[0003] In current technology, although a gas-liquid separator is generally used to mitigate the risk of liquid hammer, this method has significant shortcomings in the following situations: 1) The defrost time is difficult to control dynamically: if the defrost time is too short, the liquid refrigerant may not be completely evaporated; if the time is too long, energy is wasted and equipment efficiency is reduced; 2) The liquid refrigerant is not fully vaporized: some systems are not designed with an effective liquid refrigerant heating link, and the gas-liquid separator cannot completely solve the liquid hammer problem; 3) Insufficient dynamic adaptability: The existing method does not fully consider dynamic factors such as ambient temperature and humidity, defrost load, and system operating status, and it is difficult to ensure that the compressor suction end is always gaseous refrigerant.

[0004] Regarding the problem that when the hot gas bypass defrost technology is used for defrosting in the above-mentioned related technologies, liquid refrigerant may enter the compressor or the refrigerant may be over-gasified, resulting in poor defrosting efficiency of the air conditioner. No effective solution has been proposed so far. Summary of the invention

[0005] The embodiments of the present invention provide an air conditioner defrosting method and device taking into account the refrigerant state, so as to at least solve the technical problem in the related art that when the hot gas bypass defrosting technology is used for defrosting, liquid refrigerant may enter the compressor or the refrigerant may be over-gasified, resulting in poor defrosting efficiency of the air conditioner.

[0006] According to one aspect of an embodiment of the present invention, a defrosting method for an air conditioner taking into account the state of the refrigerant is provided, comprising: when the air conditioner is operating in a heating mode, obtaining the thickness of a frost layer on the surface of an outdoor heat exchanger at a first predetermined time interval, wherein the outdoor heat exchanger is a component in the air conditioner; when the thickness of the frost layer reaches a first preset thickness threshold, obtaining the liquid refrigerant content at a second predetermined time interval, wherein the liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant, and the second predetermined time interval is the same as or different from the first preset time interval. time interval; adjusting the preset vaporization efficiency or the preset defrost duration in the initialization frost strategy according to the content threshold range of the liquid refrigerant content to obtain a target defrost strategy, wherein the initialization frost strategy is a pre-set defrost strategy, the preset vaporization efficiency is the vaporization efficiency for vaporizing the refrigerant in the initialization frost strategy, and the preset defrost duration is the duration of the defrost process in the initialization frost strategy; controlling the air conditioner to perform a defrost operation according to the target defrost strategy until the frost layer thickness is less than a second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold.

[0007] Optionally, when the air conditioner is operating in the heating mode, the frost thickness on the surface of the outdoor heat exchanger is obtained at a first predetermined time interval, including: when the air conditioner is operating in the heating mode, controlling the ultrasonic sensor to transmit an ultrasonic signal to the outdoor heat exchanger at the first predetermined time interval, and receiving the outdoor heat exchanger and a reflected signal reflected from the ultrasonic signal, wherein the outdoor heat exchanger is arranged within a predetermined range of the surface of the outdoor heat exchanger; obtaining the cumulative time between the ultrasonic sensor transmitting the ultrasonic signal and receiving the reflected signal; and calculating the frost thickness based on the cumulative time and the propagation speed of the ultrasonic signal.

[0008] Optionally, when the thickness of the frost layer reaches a first preset thickness threshold, the liquid refrigerant content is obtained at a second preset time interval, including: when the thickness of the frost layer reaches the first preset thickness threshold, controlling the four-way reversing valve to perform a first state switch to adjust the flow direction of the refrigerant from the current flow direction to the target flow direction, wherein the current flow direction is the flow direction of the refrigerant during the operation of the air conditioner in the heating mode, and the target flow direction is the flow direction of the refrigerant during the defrosting process of the air conditioner; during the defrosting process of the air conditioner, controlling the temperature sensor to obtain the refrigerant temperature at the suction end of the compressor at the second preset time interval, and controlling the pressure sensor to obtain the refrigerant pressure at the suction end of the compressor at the second preset time interval, wherein the suction end of the compressor is an end of the compressor that inhales the refrigerant; determining the current saturated vapor pressure of the refrigerant according to the refrigerant temperature, wherein there is a one-to-one mapping relationship between the refrigerant temperature and the saturated vapor pressure; analyzing the refrigerant pressure and the saturated vapor pressure to obtain the liquid refrigerant content.

[0009] Optionally, analyzing the refrigerant pressure and the saturated vapor pressure to obtain the liquid refrigerant content includes: calculating according to the refrigerant pressure and the saturated vapor pressure using a first formula to obtain the liquid refrigerant content, wherein the first formula is: represents the liquid refrigerant content, P represents the refrigerant pressure, P sat represents the saturated vapor pressure, P max Indicates the maximum working pressure of the compressor.

[0010] Optionally, the initialization frost strategy is adjusted according to the content threshold range of the liquid refrigerant content to obtain a target defrost strategy, including: when the liquid refrigerant content is greater than a first content threshold, increasing the preset vaporization power in the initialization frost strategy to a target vaporization power to obtain the target defrost strategy, wherein the target vaporization power is a vaporization power that makes the liquid refrigerant content in the refrigerant not greater than the first content threshold within a preset defrost time; when the liquid refrigerant content is not greater than the first content threshold and the liquid refrigerant content is not less than a second content threshold, determining that the initialization frost strategy is the target defrost strategy, wherein the second content threshold is less than the first content threshold; when the liquid refrigerant content is less than the second content threshold, shortening the preset defrost time in the initialization frost strategy to a target defrost time to obtain the target defrost strategy.

[0011] Optionally, when the liquid refrigerant content is greater than a first content threshold, the preset vaporization power for vaporizing the refrigerant in the initialization frost strategy is increased to a target vaporization power to obtain the target defrost strategy, including: when the liquid refrigerant content is greater than the first content threshold, obtaining the current state of the auxiliary vaporization device, wherein the auxiliary vaporization device is a device arranged at the suction end of the compressor to heat the refrigerant; when the current state indicates that the auxiliary vaporization device is in a closed state, controlling the auxiliary vaporization device to start, so as to increase the preset vaporization power for vaporizing the refrigerant in the initialization frost strategy to the target vaporization power, and obtain the target defrost strategy; when the current state indicates that the auxiliary vaporization device is in an open state, controlling the auxiliary vaporization device to increase the heating power under the premise of meeting a preset power requirement, so as to increase the preset vaporization power for vaporizing the refrigerant in the initialization frost strategy to the target vaporization power, and obtain the target defrost strategy, wherein the preset power requirement is that the heating power of the auxiliary vaporization device is not greater than a preset power threshold.

[0012] Optionally, after controlling the air conditioner to perform a defrost operation according to a target defrost strategy until the frost layer thickness is less than a second preset thickness threshold, the air conditioner defrosting method taking into account the refrigerant state also includes: controlling the four-way reversing valve to perform a second state switch to adjust the flow direction of the refrigerant from the target flow direction to the current flow direction, so that the air conditioner is restored to the operating state of operating in the heating mode.

[0013] According to another aspect of an embodiment of the present invention, there is also provided an air conditioner defrosting device taking into account the refrigerant state, comprising: a first acquisition unit, for acquiring the thickness of a frost layer on the surface of an outdoor heat exchanger at a first predetermined time interval when the air conditioner is operating in a heating mode, wherein the outdoor heat exchanger is a component in the air conditioner; a second acquisition unit, for acquiring the liquid refrigerant content at a second predetermined time interval when the frost layer thickness reaches a first preset thickness threshold, wherein the liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant, and the second predetermined time interval is the same as or different from the first preset time interval. time interval; a third acquisition unit, used to adjust the preset vaporization efficiency or the preset defrost duration in the initialization frost strategy according to the content threshold range of the liquid refrigerant content to obtain a target defrost strategy, wherein the initialization frost strategy is a pre-set defrost strategy, the preset vaporization efficiency is the vaporization efficiency of vaporizing the refrigerant in the initialization frost strategy, and the preset defrost duration is the duration of the defrost process in the initialization frost strategy; a first control unit, used to control the air conditioner to perform a defrost operation according to the target defrost strategy until the frost layer thickness is less than a second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold.

[0014] Optionally, the first acquisition unit includes: a first control module, used to control the ultrasonic sensor to transmit an ultrasonic signal to the outdoor heat exchanger at the first predetermined time interval when the air conditioner operates in the heating mode, and receive the outdoor heat exchanger and a reflected signal reflected from the ultrasonic signal, wherein the outdoor heat exchanger is arranged within a predetermined range of the surface of the outdoor heat exchanger; a first acquisition module, used to obtain the cumulative time between the ultrasonic sensor transmitting the ultrasonic signal and receiving the reflected signal; and a calculation module, used to calculate the thickness of the frost layer based on the cumulative time and the propagation speed of the ultrasonic signal.

[0015] Optionally, the second acquisition unit includes: a second control module, which is used to control the four-way reversing valve to perform a first state switch when the thickness of the frost layer reaches the first preset thickness threshold, so as to adjust the flow direction of the refrigerant from the current flow direction to the target flow direction, wherein the current flow direction is the flow direction of the refrigerant when the air conditioner is running in the heating mode, and the target flow direction is the flow direction of the refrigerant during the defrosting process of the air conditioner; a third control module, which is used to control the temperature sensor to obtain the refrigerant temperature at the suction end of the compressor according to the second predetermined time interval during the defrosting process of the air conditioner, and control the pressure sensor to obtain the refrigerant pressure at the suction end of the compressor according to the second predetermined time interval, wherein the suction end of the compressor is an end of the compressor that inhales the refrigerant; a first determination module, which is used to determine the current saturated vapor pressure of the refrigerant according to the refrigerant temperature, wherein there is a one-to-one mapping relationship between the refrigerant temperature and the saturated vapor pressure; a second acquisition module, which is used to analyze the refrigerant pressure and the saturated vapor pressure to obtain the liquid refrigerant content.

[0016] Optionally, the second acquisition module includes: a first acquisition submodule, configured to obtain the liquid refrigerant content by calculating according to the refrigerant pressure and the saturated vapor pressure using a first formula, wherein the first formula is: represents the liquid refrigerant content, P represents the refrigerant pressure, P sat represents the saturated vapor pressure, P max Indicates the maximum working pressure of the compressor.

[0017] Optionally, the third acquisition unit includes: a third acquisition module, which is used to increase the preset vaporization power in the initialization frost strategy to a target vaporization power to obtain the target defrost strategy when the liquid refrigerant content is greater than a first content threshold, wherein the target vaporization power is a vaporization power that makes the liquid refrigerant content in the refrigerant not greater than the first content threshold within a preset defrost time; a second determination module, which is used to determine that the initialization frost strategy is the target defrost strategy when the liquid refrigerant content is not greater than the first content threshold and the liquid refrigerant content is not less than a second content threshold, wherein the second content threshold is less than the first content threshold; a fourth acquisition module, which is used to shorten the preset defrost time in the initialization frost strategy to a target defrost time to obtain the target defrost strategy when the liquid refrigerant content is less than the second content threshold.

[0018] Optionally, the third acquisition module includes: a second acquisition submodule, used to acquire the current state of the auxiliary vaporization device when the liquid refrigerant content is greater than the first content threshold, wherein the auxiliary vaporization device is a device arranged at the suction end of the compressor to heat the refrigerant; a first control submodule, used to control the auxiliary vaporization device to start up when the current state indicates that the auxiliary vaporization device is in a closed state, so as to increase the preset vaporization power for vaporizing the refrigerant in the initial frost strategy to the target vaporization power, and obtain the target defrost strategy; a second control submodule, used to control the auxiliary vaporization device to increase the heating power on the premise of meeting the preset power requirement when the current state indicates that the auxiliary vaporization device is in an open state, so as to increase the preset vaporization power for vaporizing the refrigerant in the initial frost strategy to the target vaporization power, and obtain the target defrost strategy, wherein the preset power requirement is that the heating power of the auxiliary vaporization device is not greater than a preset power threshold.

[0019] Optionally, the air conditioner defrosting device that takes the refrigerant state into consideration also includes: a second control unit, for controlling the air conditioner to perform a defrost operation according to a target defrost strategy until the frost layer thickness is less than a second preset thickness threshold, and then controlling the four-way reversing valve to perform a second state switch to adjust the flow direction of the refrigerant from the target flow direction to the current flow direction, so that the air conditioner is restored to the operating state of operating in the heating mode.

[0020] According to another aspect of an embodiment of the present invention, there is further provided an air conditioner defrosting system taking into account the refrigerant state, wherein the air conditioner defrosting system taking into account the refrigerant state uses any of the above-mentioned air conditioner defrosting methods taking into account the refrigerant state.

[0021] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, the computer-readable storage medium comprising a stored program, wherein the program executes any one of the above-mentioned air conditioner defrosting methods considering the refrigerant state.

[0022] According to another aspect of an embodiment of the present invention, a processor is further provided, the processor being used to run a program, wherein when the program is run, any one of the above-mentioned air conditioner defrosting methods considering the refrigerant state is executed.

[0023] According to another aspect of an embodiment of the present invention, a computer program product is further provided, comprising computer instructions, wherein when the computer instructions are executed by a processor, any one of the above-mentioned air conditioner defrosting methods considering the refrigerant state is executed.

[0024] In an embodiment of the present invention, when the air conditioner is operating in a heating mode, the thickness of the frost layer on the surface of the outdoor heat exchanger can be obtained according to a first predetermined time interval, wherein the outdoor heat exchanger is a component in the air conditioner; when the frost layer thickness reaches a first preset thickness threshold, the liquid refrigerant content is obtained according to a second preset time interval, wherein the liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant, and the second predetermined time interval is a time interval that is the same as or different from the first preset time interval; according to the content threshold range of the liquid refrigerant content, the preset vaporization efficiency or the preset defrost time in the initialization frost strategy is adjusted to obtain a target defrost strategy, wherein the initialization frost strategy is a pre-set defrost strategy, the preset vaporization efficiency is the vaporization efficiency for vaporizing the refrigerant in the initialization frost strategy, and the preset defrost time is the duration of the defrost process in the initialization frost strategy; the air conditioner is controlled to perform a defrost operation according to the target defrost strategy until the frost layer thickness is less than the second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold. Through the above technical scheme, the purpose of flexibly adjusting the defrost operation by monitoring the proportion of liquid refrigerant in the refrigerant is achieved to effectively defrost the air conditioner, and the technical effect of adjusting the defrost strategy according to the liquid refrigerant content to avoid liquid refrigerant entering the compressor to cause liquid hammer problems or excessive vaporization of the refrigerant is achieved. Not only the defrost efficiency of the air conditioner is improved, but also the operating reliability and life of the compressor are improved, thereby solving the technical problem in the related technology that when using hot gas bypass defrost technology for defrosting, there may be liquid refrigerant entering the compressor or excessive vaporization of the refrigerant, resulting in poor defrost efficiency of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a hardware structure block diagram of a mobile terminal of an air conditioner defrosting method considering the refrigerant state according to an embodiment of the present invention;

[0027] Figure 2 is a flow chart of a defrosting method for an air conditioner considering a refrigerant state according to an embodiment of the present invention;

[0028] Figure 3 is a flow chart of an optional air conditioner defrosting method considering the refrigerant state according to an embodiment of the present invention;

[0029] Figure 4 2 is a schematic diagram of a defrosting device for an air conditioner considering a refrigerant state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] As introduced in the background technology, when hot gas bypass defrosting technology is used for defrosting in the related art, liquid refrigerant may enter the compressor or the refrigerant may be over-gasified, resulting in poor defrosting efficiency of the air conditioner. In view of the above defects, an air conditioner defrosting method and device that considers the refrigerant state is provided in an embodiment of the present invention.

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] The method embodiments provided in the embodiments of the present invention can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal for an air conditioner defrosting method taking into account the refrigerant state according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0035] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the air conditioner defrosting method considering the refrigerant state in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0036] According to an embodiment of the present invention, a method embodiment of an air conditioner defrosting method taking into account the refrigerant state is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0037] Figure 2 is a flow chart of an air conditioner defrosting method considering the refrigerant state according to an embodiment of the present invention. Figure 2 As shown, the method comprises the following steps:

[0038] Step S202: when the air conditioner is operated in a heating mode, obtaining the thickness of the frost layer on the surface of the outdoor heat exchanger at a first predetermined time interval, wherein the outdoor heat exchanger is a component in the air conditioner.

[0039] In this embodiment, when the air conditioner is running in the heating mode, it is necessary to monitor the thickness of the frost layer on the surface of the outdoor heat exchanger in real time to determine whether defrosting is required.

[0040] Combine the following Figure 3 The above embodiments of the present invention are described in detail. Figure 3 is a flow chart of an optional air conditioner defrosting method considering the refrigerant state according to an embodiment of the present invention.

[0041] According to the above embodiment of the present invention, in the above step S202, when the air conditioner is operating in the heating mode, the thickness of the frost layer on the surface of the outdoor heat exchanger is obtained according to a first predetermined time interval, including: when the air conditioner is operating in the heating mode, controlling the ultrasonic sensor to transmit an ultrasonic signal to the outdoor heat exchanger according to a first predetermined time interval, and receiving the outdoor heat exchanger and a reflected signal reflected from the ultrasonic signal, wherein the outdoor heat exchanger is arranged within a predetermined range of the surface of the outdoor heat exchanger; obtaining the cumulative time between the ultrasonic sensor transmitting the ultrasonic signal and receiving the reflected signal; and calculating the thickness of the frost layer based on the cumulative time and the propagation speed of the ultrasonic signal.

[0042] like Figure 3 As shown, an ultrasonic sensor is added to the outdoor heat exchanger to monitor the thickness of the frost layer in real time. Specifically, the ultrasonic sensor can measure the thickness of the frost layer by emitting ultrasonic pulses to the surface of the outdoor heat exchanger and receiving pulses reflected from the surface of the frost layer. The propagation speed of ultrasonic waves in the air is known. By measuring the time difference between the transmitted and received pulses, the thickness of the frost layer can be calculated. This method is real-time and can continuously monitor the accumulation of the frost layer, thereby triggering the defrosting process in time to prevent the frost layer from being too thick and affecting the system performance.

[0043] Step S204, when the frost layer thickness reaches a first preset thickness threshold, obtaining the liquid refrigerant content according to a second preset time interval, wherein the liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant, and the second preset time interval is the same as or different from the first preset time interval.

[0044] In this embodiment, when the thickness of the frost layer reaches a first preset thickness threshold, it indicates that defrosting needs to be started. During the defrosting process, the proportion of liquid refrigerant in the refrigerant, that is, the liquid refrigerant content, can be monitored in real time to avoid liquid refrigerant entering the compressor and causing liquid hammer. The liquid refrigerant content can also be used to determine whether there is excessive vaporization and to adjust the defrost time in time.

[0045] According to the above embodiment of the present invention, in the above step S204, when the thickness of the frost layer reaches the first preset thickness threshold, the liquid refrigerant content is obtained according to the second preset time interval, including: when the thickness of the frost layer reaches the first preset thickness threshold, the four-way reversing valve is controlled to perform a first state switch to adjust the flow direction of the refrigerant from the current flow direction to the target flow direction, wherein the current flow direction is the flow direction of the refrigerant when the air conditioner is running in the heating mode, and the target flow direction is the flow direction of the refrigerant during the defrosting process of the air conditioner; during the defrosting process of the air conditioner, the temperature sensor is controlled to obtain the refrigerant temperature at the suction end of the compressor according to the second preset time interval, and the pressure sensor is controlled to obtain the refrigerant pressure at the suction end of the compressor according to the second preset time interval, wherein the suction end of the compressor is one end of the compressor that inhales the refrigerant; the current saturated vapor pressure of the refrigerant is determined according to the refrigerant temperature, wherein there is a one-to-one mapping relationship between the refrigerant temperature and the saturated vapor pressure; the refrigerant pressure and the saturated vapor pressure are analyzed to obtain the liquid refrigerant content.

[0046] like Figure 3 As shown, when the frost layer thickness reaches the set threshold (i.e., the first preset thickness threshold), assuming that the frost layer thickness is ≥2mm, it is necessary to switch the four-way reversing valve and start defrosting; if the frost layer thickness is less than 2mm, continuous monitoring is maintained until the frost layer reaches the threshold and then defrosting is started; when the defrost process is started, the high-precision temperature and pressure sensor installed at the suction end of the compressor can monitor the temperature and pressure of the refrigerant (i.e., the refrigerant temperature and the refrigerant pressure) in real time, and find the saturated vapor pressure at the corresponding temperature through the current pressure and temperature, so as to analyze and determine the current liquid refrigerant content.

[0047] In a specific embodiment of the present invention, the refrigerant pressure and the saturated vapor pressure are analyzed to obtain the liquid refrigerant content, including: calculating the liquid refrigerant content using a first formula according to the refrigerant pressure and the saturated vapor pressure, wherein the first formula is: Indicates the liquid refrigerant content, P indicates the refrigerant pressure, P sat represents the saturated vapor pressure, P max Indicates the maximum working pressure of the compressor.

[0048] Specifically, according to the formula Calculate the liquid refrigerant content, where Indicates the liquid refrigerant content, P indicates the refrigerant pressure, P sat represents the saturated vapor pressure, P max It indicates the maximum working pressure or safe working pressure of the compressor system. It determines whether and how to adjust the original defrost strategy (i.e. initial defrost strategy) by the proportion of liquid refrigerant in the refrigerant.

[0049] Step S206, adjust the preset vaporization efficiency or the preset defrost time in the initialization frost strategy according to the content threshold range of the liquid refrigerant to obtain the target defrost strategy, wherein the initialization frost strategy is a pre-set defrost strategy, the preset vaporization efficiency is the vaporization efficiency for vaporizing the refrigerant in the initialization frost strategy, and the preset defrost time is the duration of the defrost process in the initialization frost strategy.

[0050] In this embodiment, whether to adjust the initial frost strategy can be determined based on the threshold range of the liquid refrigerant content, and specifically how to adjust the preset vaporization efficiency or the preset defrost time in the initial frost strategy to obtain the target defrost strategy.

[0051] According to the above embodiment of the present invention, in the above step S206, the initialization frost strategy is adjusted according to the content threshold range of the liquid refrigerant content to obtain a target defrost strategy, including: when the liquid refrigerant content is greater than the first content threshold, the preset vaporization power in the initialization frost strategy is increased to the target vaporization power to obtain the target defrost strategy, wherein the target vaporization power is the vaporization power that makes the liquid refrigerant content in the refrigerant not greater than the first content threshold within the preset defrost time; when the liquid refrigerant content is not greater than the first content threshold and the liquid refrigerant content is not less than the second content threshold, the initialization frost strategy is determined to be the target defrost strategy, wherein the second content threshold is less than the first content threshold; when the liquid refrigerant content is less than the second content threshold, the preset defrost time in the initialization frost strategy is shortened to the target defrost time to obtain the target defrost strategy.

[0052] like Figure 3 As shown, if the liquid refrigerant content is detected to be too high (>20%), it means that the hot air in the defrosting process cannot completely vaporize the refrigerant, and the liquid refrigerant may enter the compressor. At this time, it is necessary to adjust the preset vaporization power in the initial defrost strategy to ensure that the refrigerant is completely vaporized and prevent the liquid refrigerant from entering the compressor, so as to obtain the corresponding target defrost strategy; if the liquid refrigerant content is normal (10%-20%), it means that the vaporization process is sufficient and the system can continue to defrost without additional vaporization measures. It can be considered that there is no need to adjust the initial frost strategy, and the initial frost strategy is the target defrost strategy; if the liquid refrigerant content is too low (<10%), it means that the defrost work can continue, but the defrost time needs to be shortened according to the actual situation to avoid excessive vaporization.

[0053] In another optional embodiment of the present invention, when the liquid refrigerant content is greater than a first content threshold, the preset vaporization power for vaporizing the refrigerant in the initialization frost strategy is increased to a target vaporization power to obtain a target defrost strategy, including: when the liquid refrigerant content is greater than the first content threshold, obtaining a current state of the auxiliary vaporization device, wherein the auxiliary vaporization device is a device arranged at the suction end of the compressor to heat the refrigerant; when the current state indicates that the auxiliary vaporization device is in a closed state, controlling the auxiliary vaporization device to start, so as to increase the preset vaporization power for vaporizing the refrigerant in the initialization frost strategy to the target vaporization power, and obtaining a target defrost strategy; when the current state indicates that the auxiliary vaporization device is in an open state, controlling the auxiliary vaporization device to increase the heating power under the premise of meeting the preset power requirement, so as to increase the preset vaporization power for vaporizing the refrigerant in the initialization frost strategy to the target vaporization power, and obtaining a target defrost strategy, wherein the preset power requirement is that the heating power of the auxiliary vaporization device is not greater than the preset power threshold.

[0054] Specifically, Figure 3 As shown, when it is detected that the liquid refrigerant content is too high (>20%), the auxiliary vaporization device (electric heater) installed at the suction end of the compressor can be turned on or its heating power can be adjusted to increase the vaporization power for vaporizing the refrigerant, ensure that the refrigerant is completely vaporized, avoid liquid refrigerant from entering the compressor, and dynamically adjust the heating power according to actual conditions to avoid efficiency loss caused by excessive heating. Here, it can be considered that the preset vaporization power for vaporizing the refrigerant in the initial defrost strategy is increased to the target vaporization power, and the target defrost strategy is obtained. The target vaporization power here can accelerate the vaporization of the refrigerant, so that the liquid refrigerant content can be adjusted to a normal range (10%-20%) within the preset defrost time.

[0055] Step S208, controlling the air conditioner to perform a defrosting operation according to the target defrosting strategy until the thickness of the frost layer is less than a second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold.

[0056] like Figure 3 As shown, in the process of controlling the air conditioner to defrost, it is also necessary to monitor the frost thickness on the surface of the outdoor heat exchanger in real time. If the frost thickness is detected to be less than a second preset thickness threshold, for example, when the frost layer is detected to be less than 1 mm, and it is confirmed that the refrigerant at the suction end of the compressor has been completely vaporized and no liquid refrigerant has entered, ensuring stable operation of the compressor, the defrost process can be terminated.

[0057] In an optional embodiment of the present invention, after controlling the air conditioner to perform a defrost operation according to a target defrost strategy until the frost layer thickness is less than a second preset thickness threshold, the air conditioner defrosting method taking into account the refrigerant state also includes: controlling the four-way reversing valve to perform a second state switch to adjust the flow direction of the refrigerant from the target flow direction to the current flow direction, so that the air conditioner is restored to an operating state of operating in heating mode.

[0058] Specifically, after defrosting is completed, the four-way reversing valve can be controlled to switch the state again to switch the air conditioner back to the normal heating mode to ensure that the equipment continues to operate efficiently.

[0059] From the above, it can be seen that through the technical solution provided by the above embodiment of the present invention, when the air conditioner is running in the heating mode, the frost layer thickness on the surface of the outdoor heat exchanger can be obtained according to the first predetermined time interval, wherein the outdoor heat exchanger is a component in the air conditioner; when the frost layer thickness reaches the first preset thickness threshold, the liquid refrigerant content is obtained according to the second predetermined time interval, wherein the liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant, and the second predetermined time interval is the same as or different from the first preset time interval; according to the content threshold range of the liquid refrigerant content, the preset vaporization efficiency or the preset defrost time in the initial defrost strategy is adjusted to obtain the target defrost strategy, wherein the initial defrost strategy It is a pre-set defrost strategy, the preset vaporization efficiency is the vaporization efficiency for vaporizing the refrigerant in the initial defrost strategy, and the preset defrost duration is the duration of the defrost process in the initial defrost strategy; the air conditioner is controlled to perform the defrost operation according to the target defrost strategy until the frost layer thickness is less than a second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold, thereby achieving the purpose of flexibly adjusting the defrost operation by monitoring the proportion of liquid refrigerant in the refrigerant to effectively defrost the air conditioner, and achieving the technical effect of adjusting the defrost strategy by the liquid refrigerant content to avoid liquid refrigerant entering the compressor to cause liquid hammer problems or excessive vaporization of the refrigerant, which not only improves the defrost efficiency of the air conditioner, but also improves the operating reliability and life of the compressor.

[0060] Therefore, the technical solution provided by the above-mentioned embodiment of the present invention solves the technical problem that when the hot gas bypass defrosting technology is used for defrosting in the related technology, liquid refrigerant may enter the compressor or the refrigerant may be over-gasified, resulting in poor defrosting efficiency of the air conditioner.

[0061] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0062] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment 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 this understanding, the technical solution of the present application, 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), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0063] According to an embodiment of the present invention, there is also provided an air conditioner defrosting device taking into account the refrigerant state for implementing the air conditioner defrosting method taking into account the refrigerant state. Figure 4 Schematic diagram of an air conditioner defrosting device considering the refrigerant state according to an embodiment of the present invention. Figure 4 As shown, the device comprises: a first acquisition unit 41, a second acquisition unit 43, a third acquisition unit 45 and a first control unit 47. The air conditioner defrosting device considering the refrigerant state is described in detail below.

[0064] The first acquisition unit 41 is used to acquire the frost thickness on the surface of the outdoor heat exchanger at a first predetermined time interval when the air conditioner operates in a heating mode, wherein the outdoor heat exchanger is a component in the air conditioner.

[0065] The second acquisition unit 43 is used to obtain the liquid refrigerant content at a second preset time interval when the frost layer thickness reaches the first preset thickness threshold, wherein the liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant, and the second preset time interval is the same as or different from the first preset time interval.

[0066] The third acquisition unit 45 is used to adjust the preset vaporization efficiency or the preset defrost time in the initialization frost strategy according to the content threshold range of the liquid refrigerant content to obtain a target defrost strategy, wherein the initialization frost strategy is a pre-set defrost strategy, the preset vaporization efficiency is the vaporization efficiency for vaporizing the refrigerant in the initialization frost strategy, and the preset defrost time is the duration of the defrost process in the initialization frost strategy.

[0067] The first control unit 47 is used to control the air conditioner to perform a defrosting operation according to a target defrosting strategy until the thickness of the frost layer is less than a second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold.

[0068] It should be noted here that the above-mentioned first acquisition unit 41, second acquisition unit 43, third acquisition unit 45 and first control unit 47 correspond to steps S202 to S208 in the above-mentioned embodiments, and the four units and the corresponding steps implement the same instances and application scenarios, but are not limited to the contents disclosed in the above-mentioned embodiments.

[0069] From the above, it can be seen that in the scheme recorded in the above-mentioned embodiment of the present invention, the first acquisition unit can be used to obtain the frost layer thickness on the surface of the outdoor heat exchanger according to the first predetermined time interval when the air conditioner is operating in the heating mode, wherein the outdoor heat exchanger is a component in the air conditioner; then the second acquisition unit is used to obtain the liquid refrigerant content according to the second predetermined time interval when the frost layer thickness reaches the first preset thickness threshold, wherein the liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant, and the second predetermined time interval is the same as or different from the first preset time interval; then the third acquisition unit is used to adjust the preset vaporization efficiency or the preset defrost time in the initial defrost strategy according to the content threshold range of the liquid refrigerant content to obtain the target defrost strategy, wherein , the initial defrost strategy is a pre-set defrost strategy, the preset vaporization efficiency is the vaporization efficiency of vaporizing the refrigerant in the initial defrost strategy, and the preset defrost duration is the duration of the defrost process in the initial defrost strategy; finally, the first control unit is used to control the air conditioner to perform the defrost operation according to the target defrost strategy until the frost layer thickness is less than the second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold, thereby achieving the purpose of flexibly adjusting the defrost operation by monitoring the proportion of liquid refrigerant in the refrigerant to effectively defrost the air conditioner, and achieving the technical effect of adjusting the defrost strategy by the liquid refrigerant content to avoid liquid refrigerant entering the compressor to cause liquid hammer problems or excessive vaporization of the refrigerant, which not only improves the defrost efficiency of the air conditioner, but also improves the operating reliability and life of the compressor.

[0070] Therefore, the technical solution provided by the above-mentioned embodiment of the present invention solves the technical problem that when the hot gas bypass defrosting technology is used for defrosting in the related technology, liquid refrigerant may enter the compressor or the refrigerant may be over-gasified, resulting in poor defrosting efficiency of the air conditioner.

[0071] In an optional embodiment of the present invention, the first acquisition unit includes: a first control module, which is used to control the ultrasonic sensor to transmit an ultrasonic signal to the outdoor heat exchanger at a first predetermined time interval when the air conditioner is operating in a heating mode, and receive the outdoor heat exchanger and a reflected signal reflected from the ultrasonic signal, wherein the outdoor heat exchanger is arranged within a predetermined range of the surface of the outdoor heat exchanger; a first acquisition module, which is used to obtain the cumulative time between the ultrasonic sensor transmitting the ultrasonic signal and receiving the reflected signal; and a calculation module, which is used to calculate the frost thickness based on the cumulative time and the propagation speed of the ultrasonic signal.

[0072] In an optional embodiment of the present invention, the second acquisition unit includes: a second control module, which is used to control the four-way reversing valve to perform a first state switch when the frost layer thickness reaches a first preset thickness threshold, so as to adjust the flow direction of the refrigerant from the current flow direction to the target flow direction, wherein the current flow direction is the flow direction of the refrigerant when the air conditioner is running in the heating mode, and the target flow direction is the flow direction of the refrigerant during the defrosting process of the air conditioner; a third control module, which is used to control the temperature sensor to obtain the refrigerant temperature at the suction end of the compressor according to a second predetermined time interval during the defrosting process of the air conditioner, and control the pressure sensor to obtain the refrigerant pressure at the suction end of the compressor according to a second predetermined time interval, wherein the suction end of the compressor is an end of the compressor that inhales the refrigerant; a first determination module, which is used to determine the current saturated vapor pressure of the refrigerant according to the refrigerant temperature, wherein there is a one-to-one mapping relationship between the refrigerant temperature and the saturated vapor pressure; and a second acquisition module, which is used to analyze the refrigerant pressure and the saturated vapor pressure to obtain the liquid refrigerant content.

[0073] In an optional embodiment of the present invention, the second acquisition module includes: a first acquisition submodule, which is used to calculate the liquid refrigerant content by using a first formula according to the refrigerant pressure and the saturated vapor pressure, wherein the first formula is: Indicates the liquid refrigerant content, P indicates the refrigerant pressure, P sat represents the saturated vapor pressure, P max Indicates the maximum working pressure of the compressor.

[0074] In an optional embodiment of the present invention, a third acquisition unit includes: a third acquisition module, which is used to increase the preset vaporization power in the initialization frost strategy to the target vaporization power when the liquid refrigerant content is greater than the first content threshold, so as to obtain a target defrost strategy, wherein the target vaporization power is the vaporization power that makes the liquid refrigerant content in the refrigerant not greater than the first content threshold within the preset defrost time; a second determination module, which is used to determine that the initialization frost strategy is the target defrost strategy when the liquid refrigerant content is not greater than the first content threshold and the liquid refrigerant content is not less than the second content threshold, wherein the second content threshold is less than the first content threshold; a fourth acquisition module, which is used to shorten the preset defrost time in the initialization frost strategy to the target defrost time when the liquid refrigerant content is less than the second content threshold, so as to obtain the target defrost strategy.

[0075] In an optional embodiment of the present invention, a third acquisition module includes: a second acquisition submodule, used to acquire the current state of the auxiliary vaporization device when the liquid refrigerant content is greater than a first content threshold, wherein the auxiliary vaporization device is a device arranged at the suction end of the compressor to heat the refrigerant; a first control submodule, used to control the auxiliary vaporization device to start when the current state indicates that the auxiliary vaporization device is in a closed state, so as to increase the preset vaporization power for vaporizing the refrigerant in the initial defrost strategy to a target vaporization power, and obtain a target defrost strategy; a second control submodule, used to control the auxiliary vaporization device to increase the heating power on the premise of meeting the preset power requirement when the current state indicates that the auxiliary vaporization device is in an open state, so as to increase the preset vaporization power for vaporizing the refrigerant in the initial defrost strategy to a target vaporization power, and obtain a target defrost strategy, wherein the preset power requirement is that the heating power of the auxiliary vaporization device is not greater than the preset power threshold.

[0076] In an optional embodiment of the present invention, the air conditioner defrosting device taking into account the refrigerant state also includes: a second control unit, for controlling the air conditioner to perform a defrost operation according to a target defrost strategy until the frost layer thickness is less than a second preset thickness threshold, and then controlling the four-way reversing valve to perform a second state switch to adjust the flow direction of the refrigerant from the target flow direction to the current flow direction, so that the air conditioner is restored to an operating state of operating in heating mode.

[0077] According to another aspect of an embodiment of the present invention, there is further provided an air conditioner defrosting system considering the refrigerant state, the air conditioner defrosting system considering the refrigerant state using any one of the above-mentioned air conditioner defrosting methods considering the refrigerant state.

[0078] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, the computer-readable storage medium comprising a stored program, wherein the program executes any one of the above-mentioned air conditioner defrosting methods considering the refrigerant state.

[0079] Optionally, in this embodiment, the computer-readable storage medium may be located in any one of the computer terminals in a computer terminal group in a computer network, or in any one of the communication devices in a communication device group.

[0080] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: when the air conditioner is operating in a heating mode, obtaining the frost layer thickness on the surface of the outdoor heat exchanger at a first predetermined time interval, wherein the outdoor heat exchanger is a component in the air conditioner; when the frost layer thickness reaches a first preset thickness threshold, obtaining the liquid refrigerant content at a second predetermined time interval, wherein the liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant, and the second predetermined time interval is a time interval that is the same as or different from the first preset time interval; adjusting the preset vaporization efficiency or the preset defrost duration in the initialization frost strategy according to the content threshold range of the liquid refrigerant content to obtain a target defrost strategy, wherein the initialization frost strategy is a pre-set defrost strategy, the preset vaporization efficiency is the vaporization efficiency for vaporizing the refrigerant in the initialization frost strategy, and the preset defrost duration is the duration of the defrost process in the initialization frost strategy; controlling the air conditioner to perform a defrost operation according to the target defrost strategy until the frost layer thickness is less than a second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold.

[0081] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: when the air conditioner is operating in a heating mode, controlling the ultrasonic sensor to transmit an ultrasonic signal to the outdoor heat exchanger at a first predetermined time interval, and receiving a reflected signal from the outdoor heat exchanger and the ultrasonic signal, wherein the outdoor heat exchanger is arranged within a predetermined range of the surface of the outdoor heat exchanger; obtaining the cumulative time between the ultrasonic sensor transmitting the ultrasonic signal and receiving the reflected signal; and calculating the frost layer thickness based on the cumulative time and the propagation speed of the ultrasonic signal.

[0082] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: when the thickness of the frost layer reaches a first preset thickness threshold, controlling the four-way reversing valve to perform a first state switch to adjust the flow direction of the refrigerant from the current flow direction to the target flow direction, wherein the current flow direction is the flow direction of the refrigerant when the air conditioner is operating in a heating mode, and the target flow direction is the flow direction of the refrigerant during the defrosting process of the air conditioner; during the defrosting process of the air conditioner, controlling the temperature sensor to obtain the refrigerant temperature at the suction end of the compressor at a second predetermined time interval, and controlling the pressure sensor to obtain the refrigerant pressure at the suction end of the compressor at a second predetermined time interval, wherein the suction end of the compressor is an end of the compressor that inhales the refrigerant; determining the current saturated vapor pressure of the refrigerant according to the refrigerant temperature, wherein there is a one-to-one mapping relationship between the refrigerant temperature and the saturated vapor pressure; analyzing the refrigerant pressure and the saturated vapor pressure to obtain the liquid refrigerant content.

[0083] Optionally, in this embodiment, the computer-readable storage medium is configured to store a program code for executing the following steps: calculating the liquid refrigerant content by using a first formula according to the refrigerant pressure and the saturated vapor pressure, wherein the first formula is: Indicates the liquid refrigerant content, P indicates the refrigerant pressure, P sat represents the saturated vapor pressure, P max Indicates the maximum working pressure of the compressor.

[0084] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: when the liquid refrigerant content is greater than a first content threshold, increasing the preset vaporization power in the initialization frost strategy to a target vaporization power to obtain a target defrost strategy, wherein the target vaporization power is a vaporization power that makes the liquid refrigerant content in the refrigerant not greater than a first content threshold within a preset defrost time; when the liquid refrigerant content is not greater than the first content threshold and the liquid refrigerant content is not less than a second content threshold, determining that the initialization frost strategy is a target defrost strategy, wherein the second content threshold is less than the first content threshold; when the liquid refrigerant content is less than the second content threshold, shortening the preset defrost time in the initialization frost strategy to the target defrost time to obtain a target defrost strategy.

[0085] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: when the liquid refrigerant content is greater than a first content threshold, obtaining a current state of the auxiliary vaporization device, wherein the auxiliary vaporization device is a device arranged at the suction end of the compressor to heat the refrigerant; when the current state indicates that the auxiliary vaporization device is in a closed state, controlling the auxiliary vaporization device to start, so as to increase a preset vaporization power for vaporizing the refrigerant in the initialization frost strategy to a target vaporization power, and obtain a target defrost strategy; when the current state indicates that the auxiliary vaporization device is in an open state, controlling the auxiliary vaporization device to increase the heating power on the premise of meeting a preset power requirement, so as to increase the preset vaporization power for vaporizing the refrigerant in the initialization frost strategy to a target vaporization power, and obtain a target defrost strategy, wherein the preset power requirement is that the heating power of the auxiliary vaporization device is not greater than a preset power threshold.

[0086] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: controlling the four-way reversing valve to perform a second state switch to adjust the flow direction of the refrigerant from the target flow direction to the current flow direction, so that the air conditioner is restored to an operating state running in heating mode.

[0087] According to another aspect of an embodiment of the present invention, a processor is further provided, and the processor is used to run a program, wherein when the program is run, any one of the above-mentioned air conditioner defrosting methods considering the refrigerant state is executed.

[0088] According to another aspect of an embodiment of the present invention, a computer program product is provided, comprising computer instructions, which, when executed by a processor, execute any one of the above-mentioned air conditioner defrosting methods considering the refrigerant state.

[0089] 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.

[0090] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0091] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0092] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0093] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0094] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0095] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A defrosting method for an air conditioner taking into account the state of the refrigerant, characterized in that: include: When the air conditioner is operated in a heating mode, obtaining the thickness of the frost layer on the surface of the outdoor heat exchanger according to a first predetermined time interval, wherein the outdoor heat exchanger is a component in the air conditioner; When the thickness of the frost layer reaches a first preset thickness threshold, the liquid refrigerant content is obtained according to a second preset time interval, wherein the liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant, and the second preset time interval is the same as or different from the first preset time interval; According to the content threshold range of the liquid refrigerant content, the preset vaporization efficiency or the preset defrost duration in the initialization frost strategy is adjusted to obtain a target defrost strategy, wherein the initialization frost strategy is a pre-set defrost strategy, the preset vaporization efficiency is the vaporization efficiency of vaporizing the refrigerant in the initialization frost strategy, and the preset defrost duration is the duration of the defrost process in the initialization frost strategy; The air conditioner is controlled to perform a defrosting operation according to a target defrosting strategy until the thickness of the frost layer is less than a second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold.

2. The air conditioner defrosting method considering the refrigerant state according to claim 1, characterized in that: When the air conditioner is operated in a heating mode, obtaining the thickness of the frost layer on the surface of the outdoor heat exchanger according to a first predetermined time interval includes: When the air conditioner is operated in the heating mode, the ultrasonic sensor is controlled to transmit an ultrasonic signal to the outdoor heat exchanger according to the first predetermined time interval, and receive a reflected signal from the outdoor heat exchanger and the reflected signal from the ultrasonic signal, wherein the outdoor heat exchanger is arranged within a predetermined range of the surface of the outdoor heat exchanger; Obtaining the cumulative duration between the ultrasonic sensor transmitting the ultrasonic signal and receiving the reflected signal; The thickness of the frost layer is calculated according to the accumulated time and the propagation speed of the ultrasonic signal.

3. The air conditioner defrosting method considering the refrigerant state according to claim 1, characterized in that: When the thickness of the frost layer reaches a first preset thickness threshold, obtaining the liquid refrigerant content at a second preset time interval includes: When the thickness of the frost layer reaches the first preset thickness threshold, the four-way reversing valve is controlled to perform a first state switching to adjust the flow direction of the refrigerant from the current flow direction to the target flow direction, wherein the current flow direction is the flow direction of the refrigerant when the air conditioner is running in the heating mode, and the target flow direction is the flow direction of the refrigerant when the air conditioner is defrosting; During the defrosting process of the air conditioner, the temperature sensor is controlled to obtain the refrigerant temperature at the suction end of the compressor according to the second predetermined time interval, and the pressure sensor is controlled to obtain the refrigerant pressure at the suction end of the compressor according to the second predetermined time interval, wherein the suction end of the compressor is an end of the compressor that inhales the refrigerant; Determine the current saturated vapor pressure of the refrigerant according to the refrigerant temperature, wherein there is a one-to-one mapping relationship between the refrigerant temperature and the saturated vapor pressure; The refrigerant pressure and the saturated vapor pressure are analyzed to obtain the liquid refrigerant content.

4. The air conditioner defrosting method considering the refrigerant state according to claim 3, characterized in that: Analyzing the refrigerant pressure and the saturated vapor pressure to obtain the liquid refrigerant content includes: The liquid refrigerant content is obtained by calculating according to the refrigerant pressure and the saturated vapor pressure using a first formula, wherein the first formula is: represents the liquid refrigerant content, P represents the refrigerant pressure, P sat represents the saturated vapor pressure, P max Indicates the maximum working pressure of the compressor.

5. The air conditioner defrosting method considering the refrigerant state according to claim 1, characterized in that: The initial defrost strategy is adjusted according to the content threshold range of the liquid refrigerant content to obtain a target defrost strategy, including: In the case where the liquid refrigerant content is greater than a first content threshold, the preset vaporization power in the initial frost strategy is increased to a target vaporization power to obtain the target defrost strategy, wherein the target vaporization power is a vaporization power that makes the liquid refrigerant content in the refrigerant not greater than the first content threshold within a preset defrost time; In a case where the liquid refrigerant content is not greater than the first content threshold and the liquid refrigerant content is not less than a second content threshold, determining the initial defrost strategy as the target defrost strategy, wherein the second content threshold is less than the first content threshold; When the liquid refrigerant content is less than the second content threshold, the preset defrost time in the initialization defrost strategy is shortened to a target defrost time to obtain the target defrost strategy.

6. The air conditioner defrosting method considering the refrigerant state according to claim 5, characterized in that: When the liquid refrigerant content is greater than a first content threshold, increasing the preset vaporization power for vaporizing the refrigerant in the initial defrost strategy to a target vaporization power to obtain the target defrost strategy, including: When the liquid refrigerant content is greater than the first content threshold, obtaining a current state of an auxiliary gasification device, wherein the auxiliary gasification device is a device disposed at a suction end of a compressor to heat the refrigerant; When the current state indicates that the auxiliary vaporization device is in a closed state, controlling the auxiliary vaporization device to start, so as to increase the preset vaporization power for vaporizing the refrigerant in the initial defrost strategy to the target vaporization power, and obtaining the target defrost strategy; When the current state indicates that the auxiliary vaporization device is in an on state, the auxiliary vaporization device is controlled to increase the heating power under the premise of meeting the preset power requirement, so as to increase the preset vaporization power for vaporizing the refrigerant in the initialization defrost strategy to the target vaporization power, and obtain the target defrost strategy, wherein the preset power requirement is that the heating power of the auxiliary vaporization device is not greater than a preset power threshold.

7. The air conditioner defrosting method considering the refrigerant state according to claim 1, characterized in that: After controlling the air conditioner to perform a defrosting operation according to a target defrosting strategy until the thickness of the frost layer is less than a second preset thickness threshold, the method further includes: The four-way reversing valve is controlled to perform a second state switching to adjust the flow direction of the refrigerant from the target flow direction to the current flow direction, so that the air conditioner is restored to the operating state of operating in the heating mode.

8. An air conditioner defrosting device taking into account the refrigerant state, characterized in that: include: a first acquisition unit, configured to acquire the thickness of a frost layer on a surface of an outdoor heat exchanger according to a first predetermined time interval when the air conditioner is operated in a heating mode, wherein the outdoor heat exchanger is a component in the air conditioner; A second acquisition unit is used to acquire the liquid refrigerant content according to a second preset time interval when the frost layer thickness reaches a first preset thickness threshold, wherein the liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant, and the second preset time interval is the same as or different from the first preset time interval; A third acquisition unit is used to adjust the preset vaporization efficiency or the preset defrost duration in the initialization frost strategy according to the content threshold range of the liquid refrigerant content to obtain a target defrost strategy, wherein the initialization frost strategy is a pre-set defrost strategy, the preset vaporization efficiency is the vaporization efficiency of vaporizing the refrigerant in the initialization frost strategy, and the preset defrost duration is the duration of the defrost process in the initialization frost strategy; The first control unit is used to control the air conditioner to perform a defrosting operation according to a target defrosting strategy until the thickness of the frost layer is less than a second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the air conditioner defrosting method considering the refrigerant state according to any one of claims 1 to 7.

10. A computer program product comprising computer instructions, characterized in that: When the computer instructions are executed by the processor, the air conditioner defrosting method considering the refrigerant state as described in any one of claims 1 to 7 is performed.

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