Air Conditioner Defrosting Method and Device Considering Refrigerant State

Abstract

This invention discloses a defrosting method and apparatus for an air conditioner that considers the refrigerant state. The method includes: when the air conditioner is operating in heating mode, acquiring the frost thickness on the surface of the outdoor heat exchanger at first predetermined time intervals; when the frost thickness reaches a first preset thickness threshold, acquiring the liquid refrigerant content at second predetermined time intervals; adjusting a preset vaporization efficiency or preset defrosting duration in the initial defrosting strategy according to the content threshold range of the liquid refrigerant content to obtain a target defrosting strategy; and controlling the air conditioner to perform defrosting operations according to the target defrosting strategy until the frost thickness is less than the second preset thickness threshold. This invention solves the technical problem in related technologies where hot gas bypass defrosting technology may result in liquid refrigerant entering the compressor or excessive refrigerant vaporization, leading to poor defrosting efficiency.

Description

Technical Field

[0001] This invention relates to the field of home appliance control technology, and more specifically, to a defrosting method and apparatus for an air conditioner that takes into account the refrigerant state. Background Technology

[0002] Hot gas bypass defrosting technology introduces high-temperature, high-pressure gas discharged from the compressor into the condenser for defrosting. Because it requires no additional heating elements and defrosts quickly, it is widely used in air conditioning and heat pump systems. However, during defrosting, the high-temperature gas on the condenser surface may condense into liquid refrigerant. Incompletely evaporated liquid refrigerant entering the compressor can cause liquid slugging, severely impacting the compressor's reliability and lifespan, and also reducing the defrosting performance of the air conditioner.

[0003] While current technologies generally use gas-liquid separators to mitigate the risk of liquid slugging, this method has significant shortcomings in the following situations: 1) Defrosting time is difficult to control dynamically: if the defrosting time is too short, the liquid refrigerant may not evaporate completely; if the time is too long, energy is wasted and equipment efficiency is reduced; 2) Liquid refrigerant is not fully vaporized: some systems are not designed with an effective liquid refrigerant heating stage, and the gas-liquid separator cannot completely solve the liquid slugging problem; 3) Insufficient dynamic adaptability: existing methods do not fully consider dynamic factors such as ambient temperature and humidity, defrosting load, and system operating status, making it difficult to ensure that the compressor suction end is always filled with gaseous refrigerant.

[0004] Regarding the issue that when using hot gas bypass defrosting technology in the aforementioned technologies, there may be situations where liquid refrigerant enters the compressor or the refrigerant is excessively vaporized, resulting in poor defrosting efficiency of the air conditioner, no effective solution has yet been proposed. Summary of the Invention

[0005] This invention provides an air conditioner defrosting method and apparatus that takes into account the refrigerant state, in order to at least solve the technical problem in the related art where liquid refrigerant may enter the compressor or the refrigerant may be excessively vaporized when using hot gas bypass defrosting technology, resulting in poor defrosting efficiency of the air conditioner.

[0006] According to one aspect of the present invention, a defrosting method for an air conditioner considering the refrigerant state is provided, comprising: when the air conditioner is operating in heating mode, acquiring the frost layer thickness 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; and when the frost layer thickness reaches a first preset thickness threshold, acquiring 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 predetermined time interval. The time interval; adjust the preset vaporization efficiency or preset defrosting time in the initial defrosting strategy according to the content threshold range of the liquid refrigerant content to obtain the target defrosting strategy, wherein the initial defrosting strategy is a preset defrosting strategy, the preset vaporization efficiency is the vaporization efficiency of the refrigerant in the initial defrosting strategy, and the preset defrosting time is the duration of the defrosting process in the initial defrosting strategy; control the air conditioner to perform defrosting operation according to the target defrosting 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.

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

[0008] Optionally, when the frost layer thickness reaches a first preset thickness threshold, obtaining the liquid refrigerant content at a second predetermined time interval includes: when the frost layer thickness reaches the first preset thickness threshold, controlling a four-way reversing valve to perform a first state switch to adjust the refrigerant flow direction from the current flow direction to a target flow direction, wherein the current flow direction is the flow direction of the refrigerant during the air conditioner's operation in the heating mode, and the target flow direction is the flow direction of the refrigerant during the air conditioner's defrosting process; during the air conditioner's defrosting process, controlling a temperature sensor to obtain the refrigerant temperature at the compressor suction end at a second predetermined time interval, and controlling a pressure sensor to obtain the refrigerant pressure at the compressor suction end at a second predetermined time interval, wherein the compressor suction end is the end of the compressor that draws in the refrigerant; determining the current saturated vapor pressure of the refrigerant based on the refrigerant temperature, wherein there is a one-to-one mapping relationship between the refrigerant temperature and the saturated vapor pressure; and 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 the liquid refrigerant content using a first formula based on the refrigerant pressure and the saturated vapor pressure, wherein the first formula is: P represents the liquid refrigerant content, and P represents the refrigerant pressure. sat P represents the saturated vapor pressure. max This indicates the maximum operating pressure of the compressor.

[0010] Optionally, the initial defrosting strategy is adjusted according to the content threshold range of the liquid refrigerant content to obtain a target defrosting strategy, including: when the liquid refrigerant content is greater than a first content threshold, increasing the preset vaporization power in the initial defrosting strategy to a target vaporization power to obtain the target defrosting strategy, wherein the target vaporization power is the vaporization power that ensures the liquid refrigerant content in the refrigerant is not greater than the first content threshold within a preset defrosting 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 the initial defrosting strategy as the target defrosting 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 defrosting time in the initial defrosting strategy to a target defrosting time to obtain the target defrosting 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 initial defrost strategy is increased to a target vaporization power to obtain the target defrost strategy. This includes: when the liquid refrigerant content is greater than the first content threshold, obtaining the current state of an auxiliary vaporization device, wherein the auxiliary vaporization device is a device installed at the compressor suction end 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, thereby increasing the preset vaporization power for vaporizing the refrigerant in the initial defrost strategy to the target vaporization power to 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 its heating power while meeting a preset power requirement, thereby increasing the preset vaporization power for vaporizing the refrigerant in the initial defrost strategy to the target vaporization power to 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 defrosting operation according to the target defrosting strategy until the frost layer thickness is less than the second preset thickness threshold, the air conditioner defrosting method considering the refrigerant state further 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 returns to the operating state of operating in the heating mode.

[0013] According to another aspect of the present invention, an air conditioner defrosting device considering refrigerant state is also provided, comprising: a first acquisition unit, configured to acquire the frost layer thickness on the surface of an outdoor heat exchanger at a first predetermined time interval when the air conditioner is operating in heating mode, wherein the outdoor heat exchanger is a component in the air conditioner; and a second acquisition unit, configured to acquire 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. The time interval; the third acquisition unit is used to adjust the preset vaporization efficiency or preset defrosting time in the initial defrosting strategy according to the content threshold range of the liquid refrigerant content, to obtain the target defrosting strategy, wherein the initial defrosting strategy is a preset defrosting strategy, the preset vaporization efficiency is the vaporization efficiency of the refrigerant in the initial defrosting strategy, and the preset defrosting time is the duration of the defrosting process in the initial defrosting strategy; the first control unit is used to control the air conditioner to perform defrosting operation according to the target defrosting 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.

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

[0015] Optionally, the second acquisition unit includes: a second control module, configured to control a four-way reversing valve to perform a first state switch when the frost layer thickness 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 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; a third control module, configured to control a temperature sensor to acquire the refrigerant temperature at the compressor suction end according to the second predetermined time interval during the defrosting process of the air conditioner, and control a pressure sensor to acquire the refrigerant pressure at the compressor suction end according to the second predetermined time interval, wherein the compressor suction end is the end of the compressor that draws in the refrigerant; a first determination module, configured to determine the current saturated vapor pressure of the refrigerant based on 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, configured 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 calculate the liquid refrigerant content based on the refrigerant pressure and the saturated vapor pressure using a first formula, wherein the first formula is: P represents the liquid refrigerant content, and P represents the refrigerant pressure. sat P represents the saturated vapor pressure. max This indicates the maximum operating pressure of the compressor.

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

[0018] Optionally, the third acquisition module includes: a second acquisition submodule, configured 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 installed at the compressor suction end to heat the refrigerant; a first control submodule, configured 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 the target vaporization power, thereby obtaining the target defrost strategy; and a second control submodule, configured to control the auxiliary vaporization device to increase the heating power while meeting a 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 the target vaporization power, thereby obtaining 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 into account the refrigerant state further includes: a second control unit, used to control the air conditioner to perform a defrosting operation according to the target defrosting strategy until the frost layer thickness is less than a second preset thickness threshold, and then control 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 returns to the operating state of operating in the heating mode.

[0020] According to another aspect of the present invention, an air conditioner defrosting system that takes into account the refrigerant state is also provided, wherein the air conditioner defrosting system that takes into account the refrigerant state uses any of the above-described air conditioner defrosting methods that take into account the refrigerant state.

[0021] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes any of the above-described defrosting methods for an air conditioner taking into account the refrigerant state.

[0022] According to another aspect of the present invention, a processor is also provided, the processor being configured to run a program, wherein the program, when running, executes any of the above-described defrosting methods for an air conditioner taking into account the refrigerant state.

[0023] According to another aspect of the present invention, a computer program product is also provided, including computer instructions that, when executed by a processor, perform any of the above-described defrosting methods for an air conditioner considering refrigerant status.

[0024] In this embodiment of the invention, when the air conditioner is operating in heating mode, the frost thickness on the surface of the outdoor heat exchanger is obtained at a first predetermined time interval, wherein the outdoor heat exchanger is a component in the air conditioner; when the frost thickness reaches a first preset thickness threshold, the liquid refrigerant content is obtained 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; the preset vaporization efficiency or preset defrosting time in the initial defrosting strategy is adjusted according to the content threshold range of the liquid refrigerant content to obtain a target defrosting strategy, wherein the initial defrosting strategy is a pre-set defrosting strategy, the preset vaporization efficiency is the vaporization efficiency of the refrigerant in the initial defrosting strategy, and the preset defrosting time is the duration of the defrosting process in the initial defrosting strategy; the air conditioner is controlled to perform defrosting operation according to the target defrosting strategy until the frost thickness is less than the second preset thickness threshold, wherein the second preset thickness threshold is less than the first preset thickness threshold. The above technical solutions achieve the goal of flexibly adjusting the defrosting operation by monitoring the proportion of liquid refrigerant in the refrigerant, thereby effectively defrosting the air conditioner. This achieves the technical effect of adjusting the defrosting strategy by adjusting the liquid refrigerant content to avoid liquid refrigerant entering the compressor and causing liquid slugging or excessive refrigerant vaporization. This not only improves the defrosting efficiency of the air conditioner but also enhances the operational reliability and lifespan of the compressor. Furthermore, it solves the technical problem of poor defrosting efficiency in related technologies that use hot gas bypass defrosting technology, which may result in liquid refrigerant entering the compressor or excessive refrigerant vaporization. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

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

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

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

[0029] Figure 4 This is a schematic diagram of an air conditioner defrosting device considering the refrigerant state according to an embodiment of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort 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, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] As described in the background section, when using hot gas bypass defrosting technology in related technologies, situations may arise such as liquid refrigerant entering the compressor or excessive refrigerant vaporization, resulting in poor defrosting efficiency of the air conditioner. To address these shortcomings, embodiments of the present invention provide an air conditioner defrosting method and apparatus that considers the refrigerant state.

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

[0034] The methods and embodiments provided in this invention can be executed on a mobile terminal, a computer terminal, or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for an air conditioner defrosting method considering refrigerant status, according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0035] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the air conditioner defrosting method considering refrigerant state in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-described networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the above-described networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station 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 considering the refrigerant state is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0037] Figure 2 This is a flowchart of an air conditioner defrosting method considering refrigerant state according to an embodiment of the present invention, such as... Figure 2 As shown, the method includes the following steps:

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

[0039] In this embodiment, during the operation of the air conditioner in 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] The following is combined Figure 3 The embodiments of the present invention will be described in detail below. Figure 3 This is a flowchart of an optional air conditioner defrosting method considering the refrigerant state according to an embodiment of the present invention.

[0041] According to the above embodiments of the present invention, in step S202, when the air conditioner is operating in heating mode, obtaining the frost thickness on the surface of the outdoor heat exchanger at a first predetermined time interval includes: when the air conditioner is operating in heating mode, controlling an ultrasonic sensor to emit ultrasonic signals to the outdoor heat exchanger at a first predetermined time interval, and receiving the outdoor heat exchanger and the reflected signal reflected from the ultrasonic signal, wherein the outdoor heat exchanger is disposed within a predetermined range on the surface of the outdoor heat exchanger; obtaining the cumulative duration between the ultrasonic sensor emitting the ultrasonic signal and receiving the reflected signal; and calculating the frost thickness based on the cumulative duration 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 frost thickness in real time. Specifically, the ultrasonic sensor measures the frost thickness by emitting ultrasonic pulses to the surface of the outdoor heat exchanger and receiving the pulses reflected back from the frost surface. The speed of ultrasonic waves in the air is known. By measuring the time difference between the emitted and received pulses, the frost thickness can be calculated. This method is real-time and can continuously monitor the accumulation of frost, thereby triggering the defrosting process in a timely manner and preventing excessive frost from affecting system performance.

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

[0044] In this embodiment, when the frost layer thickness reaches the first preset thickness threshold, it indicates that defrosting needs to be initiated. During the defrosting process, the proportion of liquid refrigerant in the refrigerant, i.e., the liquid refrigerant content, can be monitored in real time to prevent liquid refrigerant from entering the compressor and causing liquid slugging. The liquid refrigerant content can also be used to determine whether there is excessive vaporization, so as to adjust the defrosting time in a timely manner.

[0045] According to the above embodiments of the present invention, in step S204, when the frost layer thickness reaches a first preset thickness threshold, the liquid refrigerant content is obtained according to a second predetermined time interval, including: when the frost layer thickness reaches the first preset thickness threshold, controlling the four-way reversing valve to perform a first state switch to adjust the refrigerant flow direction from the current flow direction to the target flow direction, wherein the current flow direction is the flow direction of the refrigerant during the air conditioner's operation in heating mode, and the target flow direction is the flow direction of the refrigerant during the air conditioner's defrosting process; during the air conditioner's defrosting process, controlling the temperature sensor to obtain the refrigerant temperature at the compressor suction end according to a second predetermined time interval, and controlling the pressure sensor to obtain the refrigerant pressure at the compressor suction end according to a second predetermined time interval, wherein the compressor suction end is the end of the compressor that draws in refrigerant; determining the current saturated vapor pressure of the refrigerant based on the refrigerant temperature, wherein there is a one-to-one mapping relationship between the refrigerant temperature and the saturated vapor pressure; and analyzing the refrigerant pressure and the saturated vapor pressure 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 the frost layer thickness is ≥2mm, the four-way reversing valve needs to be switched to start defrosting; if the frost layer thickness is less than 2mm, continuous monitoring is maintained until the frost layer reaches the threshold before defrosting is started; when the defrosting process is started, the high-precision temperature and pressure sensors installed at the compressor suction end can monitor the refrigerant temperature and pressure (i.e., refrigerant temperature and 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, analyzing the refrigerant pressure and saturated vapor pressure to obtain the liquid refrigerant content includes: calculating the liquid refrigerant content based on the refrigerant pressure and saturated vapor pressure using a first formula, wherein the first formula is: P represents the liquid refrigerant content, and P represents the refrigerant pressure. sat P represents the saturated vapor pressure. max This indicates the compressor's maximum operating pressure.

[0048] Specifically, it can be based on the formula Calculate the liquid refrigerant content, where, P represents the liquid refrigerant content, and P represents the refrigerant pressure. sat P represents the saturated vapor pressure. max This indicates the maximum or safe operating pressure of the compressor system. The proportion of liquid refrigerant in the refrigerant determines whether the original defrosting strategy (i.e., the initial defrosting strategy) needs to be adjusted and how to adjust it.

[0049] Step S206: Adjust the preset vaporization efficiency or preset defrosting time in the initial defrosting strategy according to the content threshold range of the liquid refrigerant content to obtain the target defrosting strategy. The initial defrosting strategy is a pre-set defrosting strategy, the preset vaporization efficiency is the vaporization efficiency of the refrigerant in the initial defrosting strategy, and the preset defrosting time is the duration of the defrosting process in the initial defrosting strategy.

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

[0051] According to the above embodiments of the present invention, in step S206, adjusting the initial defrosting strategy based on the content threshold range of the liquid refrigerant content to obtain a target defrosting strategy includes: when the liquid refrigerant content is greater than a first content threshold, increasing the preset vaporization power in the initial defrosting strategy to a target vaporization power to obtain a target defrosting strategy, wherein the target vaporization power is the vaporization power that ensures the liquid refrigerant content in the refrigerant is not greater than the first content threshold within a preset defrosting time; when the liquid refrigerant content is not greater than the first content threshold and not less than a second content threshold, determining the initial defrosting strategy as the target defrosting 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 defrosting time in the initial defrosting strategy to a target defrosting time to obtain the target defrosting strategy.

[0052] like Figure 3 As shown, if the detected liquid refrigerant content is too high (>20%), it indicates that the hot gas during the defrosting process cannot completely vaporize the refrigerant, and the liquid refrigerant may enter the compressor. In this case, the preset vaporization power in the initial defrosting strategy needs to be adjusted to ensure complete vaporization of the refrigerant and prevent liquid refrigerant from entering the compressor, thus obtaining the corresponding target defrosting strategy. If the liquid refrigerant content is normal (10%-20%), it indicates that the vaporization process is sufficient, and the system can continue defrosting without additional vaporization measures. In this case, it can be considered that no adjustment is needed to the initial defrosting strategy, and the initial defrosting strategy is the target defrosting strategy. If the liquid refrigerant content is too low (<10%), it indicates that the defrosting work can continue, but the defrosting time needs to be shortened according to the actual situation to avoid over-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 refrigerant vaporization in the initial defrosting strategy is increased to a target vaporization power to obtain a target defrosting strategy. This includes: when the liquid refrigerant content is greater than the first content threshold, obtaining the current state of an auxiliary vaporization device, wherein the auxiliary vaporization device is a device installed at the compressor suction end 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, thereby increasing the preset vaporization power for refrigerant vaporization in the initial defrosting strategy to the target vaporization power to obtain the target defrosting strategy; when the current state indicates that the auxiliary vaporization device is in an open state, controlling the auxiliary vaporization device to increase its heating power while meeting a preset power requirement, thereby increasing the preset vaporization power for refrigerant vaporization in the initial defrosting strategy to the target vaporization power to obtain the target defrosting strategy, wherein the preset power requirement is that the heating power of the auxiliary vaporization device is not greater than a preset power threshold.

[0054] Specifically, such as Figure 3 As shown, when the liquid refrigerant content is detected to be too high (>20%), the auxiliary vaporization device (electric heater) installed at the compressor suction end can be turned on or its heating power can be adjusted to increase the vaporization power of the refrigerant, ensuring that the refrigerant is completely vaporized and preventing liquid refrigerant from entering the compressor. The heating power can be dynamically adjusted according to the actual situation to avoid efficiency loss caused by overheating. This can be considered as increasing the preset vaporization power of the refrigerant in the initial defrosting strategy to the target vaporization power, thus obtaining the target defrosting strategy. The target vaporization power can accelerate the vaporization of the refrigerant so that the liquid refrigerant content can be adjusted to the normal range (10%-20%) within the preset defrosting time.

[0055] Step S208: Control the air conditioner to perform defrosting operation according to the target defrosting 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.

[0056] like Figure 3 As shown, during the defrosting process of the air conditioner, 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 the second preset thickness threshold, for example, when the frost thickness is detected to be less than 1 mm, and it is confirmed that the refrigerant at the compressor suction end has been completely vaporized and no liquid refrigerant has entered, ensuring stable compressor operation, the defrosting process can be terminated.

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

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

[0059] As described above, the technical solution provided by the above embodiments of the present invention allows for the acquisition of frost thickness on the surface of the outdoor heat exchanger at a first predetermined time interval when the air conditioner is operating in heating mode. The outdoor heat exchanger is a component of the air conditioner. When the frost thickness reaches a first preset thickness threshold, the liquid refrigerant content is acquired at a second predetermined time interval. The liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant, used to determine the state of the refrigerant. The second predetermined time interval is the same as or different from the first predetermined time interval. Based on the content threshold range of the liquid refrigerant content, the preset vaporization efficiency or preset defrosting time in the initial defrosting strategy is adjusted to obtain the target defrosting strategy. The initial defrosting strategy... The system employs a pre-set defrosting strategy, with a preset vaporization efficiency equal to the refrigerant vaporization efficiency in the initial defrosting strategy and a preset defrosting duration equal to the defrosting process duration in the initial defrosting strategy. It controls the air conditioner to execute defrosting operations according to the target defrosting strategy until the frost layer thickness is less than a second preset thickness threshold, where the second preset thickness threshold is less than a first preset thickness threshold. This achieves the goal of flexibly adjusting the defrosting operation by monitoring the proportion of liquid refrigerant in the refrigerant, thus effectively defrosting the air conditioner. It realizes the technical effect of adjusting the defrosting strategy by adjusting the liquid refrigerant content to avoid liquid refrigerant entering the compressor and causing liquid slugging or excessive refrigerant vaporization. This not only improves the defrosting efficiency of the air conditioner but also enhances the operational reliability and lifespan of the compressor.

[0060] Therefore, the technical solution provided by the above embodiments of the present invention solves the technical problem in the related art that when using hot gas bypass defrosting technology for defrosting, there may be situations such as liquid refrigerant entering the compressor or excessive vaporization of refrigerant, resulting in poor defrosting efficiency of the air conditioner.

[0061] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0062] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0063] According to embodiments of the present invention, an air conditioner defrosting apparatus considering refrigerant state is also provided for implementing the above-described air conditioner defrosting method considering refrigerant state. Figure 4 This is a schematic diagram of an air conditioner defrosting device considering the refrigerant state according to an embodiment of the present invention, as shown below. Figure 4 As shown, the device includes: a first acquisition unit 41, a second acquisition unit 43, a third acquisition unit 45, and a first control unit 47. The defrosting device for an air conditioner that takes into account the refrigerant state will be 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 is operating in heating mode, wherein the outdoor heat exchanger is a component in the air conditioner.

[0065] The second acquisition unit 43 is used to acquire the liquid refrigerant content according to a second predetermined time interval when the frost layer thickness reaches a first preset thickness threshold. The liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant. The second predetermined time interval is a time interval that 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 preset defrosting time in the initial defrosting strategy according to the content threshold range of the liquid refrigerant content, so as to obtain the target defrosting strategy. The initial defrosting strategy is a pre-set defrosting strategy, the preset vaporization efficiency is the vaporization efficiency of the refrigerant in the initial defrosting strategy, and the preset defrosting time is the duration of the defrosting process in the initial defrosting strategy.

[0067] The first control unit 47 is used to control the air conditioner to perform a defrosting operation according to the target defrosting 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.

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

[0069] As can be seen from the above, in the solution described in the above embodiments of the present invention, the first acquisition unit can acquire the frost layer thickness on the surface of the outdoor heat exchanger at a first predetermined time interval when the air conditioner is running in heating mode, wherein the outdoor heat exchanger is a component in the air conditioner; then, the second acquisition unit can acquire 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; then, the third acquisition unit can adjust the preset vaporization efficiency or preset defrosting time in the initial defrosting strategy according to the content threshold range of the liquid refrigerant content to obtain the target defrosting strategy, wherein... The initial defrosting strategy is a pre-set defrosting strategy, the preset vaporization efficiency is the vaporization efficiency of the refrigerant in the initial defrosting strategy, and the preset defrosting duration is the duration of the defrosting process in the initial defrosting strategy. Finally, the first control unit controls the air conditioner to perform defrosting operation according to the target defrosting strategy until the frost layer thickness is less than the second preset thickness threshold, where the second preset thickness threshold is less than the first preset thickness threshold. This achieves the goal of flexibly adjusting the defrosting operation by monitoring the proportion of liquid refrigerant in the refrigerant, so as to effectively defrost the air conditioner. It realizes the technical effect of adjusting the defrosting strategy by adjusting the liquid refrigerant content to avoid liquid refrigerant entering the compressor and causing liquid slugging or excessive refrigerant vaporization. This not only improves the defrosting efficiency of the air conditioner, but also improves the operating reliability and lifespan of the compressor.

[0070] Therefore, the technical solution provided by the above embodiments of the present invention solves the technical problem in the related art that when using hot gas bypass defrosting technology for defrosting, there may be situations such as liquid refrigerant entering the compressor or excessive vaporization of refrigerant, 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, configured to control an ultrasonic sensor to emit ultrasonic signals to an outdoor heat exchanger at a first predetermined time interval when the air conditioner is operating in heating mode, and to receive the outdoor heat exchanger and the reflected signal reflected from the ultrasonic signal, wherein the outdoor heat exchanger is disposed within a predetermined range on the surface of the outdoor heat exchanger; the first acquisition module is configured to acquire the cumulative duration between the ultrasonic sensor emitting the ultrasonic signal and receiving the reflected signal; and a calculation module is configured to calculate the frost layer thickness based on the cumulative duration 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, configured to control a 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 refrigerant flow direction from the current flow direction to the target flow direction, wherein the current flow direction is the flow direction of the refrigerant during the air conditioner's operation in heating mode, and the target flow direction is the flow direction of the refrigerant during the air conditioner's defrosting process; a third control module, configured to control a temperature sensor to acquire the refrigerant temperature at the compressor suction end at a second predetermined time interval and control a pressure sensor to acquire the refrigerant pressure at the compressor suction end at a second predetermined time interval during the air conditioner's defrosting process, wherein the compressor suction end is the end of the compressor that draws in refrigerant; a first determination module, configured to determine the current saturated vapor pressure of the refrigerant based on 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, configured to analyze the refrigerant pressure and 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, configured to calculate the liquid refrigerant content based on the refrigerant pressure and saturated vapor pressure using a first formula, wherein the first formula is: P represents the liquid refrigerant content, and P represents the refrigerant pressure. sat P represents the saturated vapor pressure. max This indicates the compressor's maximum operating pressure.

[0074] In an optional embodiment of the present invention, the third acquisition unit includes: a third acquisition module, configured to increase the preset vaporization power in the initial defrosting strategy to a target vaporization power when the liquid refrigerant content is greater than a first content threshold, thereby obtaining a target defrosting strategy, wherein the target vaporization power is the vaporization power that ensures the liquid refrigerant content in the refrigerant is not greater than the first content threshold within a preset defrosting time; a second determination module, configured to determine the initial defrosting strategy as the target defrosting strategy when the liquid refrigerant content is not greater than the first content threshold and not less than a second content threshold, wherein the second content threshold is less than the first content threshold; and a fourth acquisition module, configured to shorten the preset defrosting time in the initial defrosting strategy to a target defrosting time when the liquid refrigerant content is less than the second content threshold, thereby obtaining the target defrosting strategy.

[0075] In an optional embodiment of the present invention, the third acquisition module includes: a second acquisition submodule, configured 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 installed at the compressor suction end to heat the refrigerant; a first control submodule, configured 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, thereby obtaining a target defrost strategy; and a second control submodule, configured to control the auxiliary vaporization device to increase the heating power while meeting a 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, thereby obtaining 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.

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

[0077] According to another aspect of the present invention, an air conditioner defrosting system considering refrigerant state is also provided, which uses any of the above-described air conditioner defrosting methods considering refrigerant state.

[0078] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes any of the above-described defrosting methods for an air conditioner taking into account the refrigerant state.

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

[0080] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the air conditioner is operating in heating mode, obtaining the frost 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 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 the same as or different from the first preset time interval; adjusting the preset vaporization efficiency or preset defrosting time in the initial defrosting strategy according to the content threshold range of the liquid refrigerant content to obtain a target defrosting strategy, wherein the initial defrosting strategy is a pre-set defrosting strategy, the preset vaporization efficiency is the vaporization efficiency of the refrigerant in the initial defrosting strategy, and the preset defrosting time is the duration of the defrosting process in the initial defrosting strategy; controlling the air conditioner to perform defrosting operation according to the target defrosting strategy until the frost thickness is less than the 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 code for performing the following steps: when the air conditioner is operating in heating mode, controlling the ultrasonic sensor to emit ultrasonic signals to the outdoor heat exchanger at a first predetermined time interval, and receiving the outdoor heat exchanger and the reflected signal reflected from the ultrasonic signal, wherein the outdoor heat exchanger is disposed within a predetermined range on the surface of the outdoor heat exchanger; obtaining the cumulative duration between the ultrasonic sensor emitting the ultrasonic signal and receiving the reflected signal; and calculating the frost layer thickness based on the cumulative duration and the propagation speed of the ultrasonic signal.

[0082] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the frost layer thickness reaches a first preset thickness threshold, controlling the four-way reversing valve to perform a first state switch to adjust the refrigerant flow direction from the current flow direction to the target flow direction, wherein the current flow direction is the refrigerant flow direction during the air conditioner's operation in heating mode, and the target flow direction is the refrigerant flow direction during the air conditioner's defrosting process; during the air conditioner's defrosting process, controlling the temperature sensor to acquire the refrigerant temperature at the compressor suction end according to a second predetermined time interval, and controlling the pressure sensor to acquire the refrigerant pressure at the compressor suction end according to a second predetermined time interval, wherein the compressor suction end is the end of the compressor that draws in refrigerant; determining the current saturated vapor pressure of the refrigerant based on 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 program code for performing the following steps: calculating the liquid refrigerant content based on the refrigerant pressure and saturated vapor pressure using a first formula, wherein the first formula is: P represents the liquid refrigerant content, and P represents the refrigerant pressure. sat P represents the saturated vapor pressure. max This indicates the compressor's maximum operating pressure.

[0084] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the liquid refrigerant content is greater than a first content threshold, increasing the preset vaporization power in the initial defrost strategy to a target vaporization power to obtain a target defrost strategy, wherein the target vaporization power is the vaporization power that ensures the liquid refrigerant content in the refrigerant is not greater than the first content threshold within a preset defrost duration; when the liquid refrigerant content is not greater than the first content threshold and 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, shortening the preset defrost duration in the initial defrost strategy to a target defrost duration to obtain the target defrost strategy.

[0085] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the liquid refrigerant content is greater than a first content threshold, obtaining the current state of the auxiliary vaporization device, wherein the auxiliary vaporization device is a device installed at the compressor suction end 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 defrosting strategy to a target vaporization power, thereby obtaining a target defrosting 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 initial defrosting strategy to a target vaporization power, thereby obtaining a target defrosting 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 code for performing the following steps: controlling the four-way reversing valve to perform a second state switch to adjust the refrigerant flow direction from the target flow direction to the current flow direction, so that the air conditioner returns to the operating state of operating in heating mode.

[0087] According to another aspect of the present invention, a processor is also provided, which is used to run a program, wherein the program executes any of the above-described defrosting methods for an air conditioner that takes into account the refrigerant state.

[0088] According to another aspect of the present invention, a computer program product is also provided, including computer instructions, which, when executed by a processor, perform any of the above-described defrosting methods for an air conditioner considering the refrigerant state.

[0089] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0090] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer 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. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

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

[0093] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0094] If the integrated unit is implemented as 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. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0095] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A defrosting method for an air conditioner considering the refrigerant state, characterized in that, include: When the air conditioner is operating in heating mode, the frost thickness on the surface of the outdoor heat exchanger is obtained 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, the liquid refrigerant content is obtained according to 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 predetermined time interval; The preset vaporization power or preset defrosting time in the initial defrosting strategy is adjusted according to the content threshold range of the liquid refrigerant content to obtain the target defrosting strategy. The initial defrosting strategy is a pre-set defrosting strategy, the preset vaporization power is the vaporization power of the refrigerant in the initial defrosting strategy, and the preset defrosting time is the duration of the defrosting process in the initial defrosting strategy. The air conditioner is controlled 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.

2. The defrosting method for an air conditioner considering the refrigerant state according to claim 1, characterized in that, When the air conditioner is operating in 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, the ultrasonic sensor is controlled to emit ultrasonic signals to the outdoor heat exchanger at the first predetermined time interval, and to receive the outdoor heat exchanger and the reflected signal reflected by the ultrasonic signal, wherein the outdoor heat exchanger is disposed within a predetermined range on the surface of the outdoor heat exchanger. The cumulative duration between the ultrasonic sensor emitting the ultrasonic signal and receiving the reflected signal is obtained. The thickness of the frost layer is calculated based on the cumulative duration and the propagation speed of the ultrasonic signal.

3. The defrosting method for an air conditioner considering the refrigerant state according to claim 1, characterized in that, When the frost layer thickness reaches a first preset thickness threshold, the liquid refrigerant content is obtained at a second predetermined time interval, including: When the frost layer thickness 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 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, the temperature sensor is controlled to obtain the refrigerant temperature at the compressor suction end according to the second predetermined time interval, and the pressure sensor is controlled to obtain the refrigerant pressure at the compressor suction end according to the second predetermined time interval, wherein the compressor suction end is the end of the compressor that draws in the refrigerant; The current saturated vapor pressure of the refrigerant is determined based on 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 saturated vapor pressure are analyzed to obtain the liquid refrigerant content.

4. The defrosting method for an air conditioner considering the refrigerant state according to claim 3, characterized in that, The refrigerant pressure and saturated vapor pressure are analyzed to obtain the liquid refrigerant content, including: The liquid refrigerant content is calculated using a first formula based on the refrigerant pressure and the saturated vapor pressure, wherein the first formula is: , This indicates the liquid refrigerant content, and P indicates the refrigerant pressure. This represents the saturated vapor pressure. This indicates the maximum operating pressure of the compressor.

5. The defrosting method for an air conditioner considering the refrigerant state according to claim 1, characterized in that, The initial defrosting strategy is adjusted based on the content threshold range of the liquid refrigerant to obtain the target defrosting strategy, including: When the liquid refrigerant content is greater than a first content threshold, the preset vaporization power in the initial defrosting strategy is increased to a target vaporization power to obtain the target defrosting strategy, wherein the target vaporization power is the vaporization power that keeps the liquid refrigerant content in the refrigerant from being greater than the first content threshold within a preset defrosting time. If 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 initial defrosting strategy is determined to be the target defrosting 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 defrosting time in the initial defrosting strategy is shortened to the target defrosting time to obtain the target defrosting strategy.

6. The defrosting method for an air conditioner considering the refrigerant state according to claim 5, characterized in that, When the liquid refrigerant content is greater than a first content threshold, the preset vaporization power for vaporizing the refrigerant in the initial defrosting strategy is increased to a target vaporization power to obtain the target defrosting strategy, including: When the liquid refrigerant content is greater than the first content threshold, the current state of the auxiliary vaporization device is obtained, wherein the auxiliary vaporization device is a device installed at the compressor suction end to heat the refrigerant; When the current state indicates that the auxiliary vaporization device is in the off state, the auxiliary vaporization device is controlled to start, so as to increase the preset vaporization power of the refrigerant in the initial defrosting strategy to the target vaporization power, thereby obtaining the target defrosting strategy; When the current state flag indicates that the auxiliary vaporization device is in the on state, the auxiliary vaporization device is controlled to increase the heating power while meeting the preset power requirement, so as to increase the preset vaporization power for vaporizing the refrigerant in the initial defrosting strategy to the target vaporization power, thereby obtaining the target defrosting 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 defrosting method for an air conditioner considering the refrigerant state according to claim 1, characterized in that, After controlling the air conditioner to perform defrosting operations according to the target defrosting strategy until the frost layer thickness is less than a second preset thickness threshold, the method further includes: The four-way reversing valve is controlled 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 returns to the operating state of operating in the heating mode.

8. An air conditioner defrosting device considering the refrigerant state, characterized in that, include: The first acquisition unit 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 is running in heating mode, wherein the outdoor heat exchanger is a component in the air conditioner. The second acquisition unit is used to acquire the liquid refrigerant content according to a second predetermined time interval when the frost layer thickness reaches a first preset thickness threshold. The liquid refrigerant content refers to the proportion of liquid refrigerant in the refrigerant and is used to determine the state of the refrigerant. The second predetermined time interval is the same as or different from the first predetermined time interval. The third acquisition unit is used to adjust the preset vaporization power or preset defrosting time in the initial defrosting strategy according to the content threshold range of the liquid refrigerant content, so as to obtain the target defrosting strategy. The initial defrosting strategy is a preset defrosting strategy, the preset vaporization power is the vaporization power of the refrigerant in the initial defrosting strategy, and the preset defrosting time is the duration of the defrosting process in the initial defrosting strategy. A first control unit is configured 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 performs the air conditioner defrosting method taking into account the refrigerant state as described in 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, they perform the air conditioner defrosting method considering the refrigerant state as described in any one of claims 1 to 7.

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