Defrosting method and device and air conditioning equipment

Abstract

The embodiment of the invention discloses a defrosting method and device and air conditioning equipment. The method comprises the steps that environment parameter information and operation data of the air conditioner equipment are obtained, and the operation data of the air conditioner equipment comprise parameter information of a heat exchanger and current information of the air conditioner equipment; adjusting a preset difference threshold value and a preset current threshold value according to the environmental parameter information; and according to the difference value between the environment parameter information and the parameter information of the heat exchanger, the difference between the environment parameter information and a preset difference value threshold value and the difference between the current information and a preset current threshold value, the air conditioning equipment is controlled to defrost the heat exchanger. According to the technical scheme provided by the embodiment of the invention, the accuracy of frosting judgment of the heat exchanger is improved, and the risk of misjudgment is reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioning defrosting technology, and in particular to a defrosting method, apparatus and air conditioning equipment. Background Technology

[0002] With the continuous advancement of life and technology, air conditioning equipment has become an indispensable energy conversion tool in industrial production and daily life. However, the heat exchanger in air conditioning equipment may frost up during operation, which will seriously affect the working efficiency and heating effect of the air conditioning equipment.

[0003] Currently, the determination of whether a heat exchanger is frosted mainly relies on obtaining the coil temperature through a temperature sensor or by measuring the compressor current. The coil temperature, representing the temperature at a specific point within the air conditioning unit, cannot accurately reflect whether the heat exchanger is frosted. Furthermore, the compressor current varies according to the high and low pressure differential of the air conditioning unit, and its magnitude cannot directly indicate whether the heat exchanger is actually frosted. Existing technologies cannot accurately determine whether the heat exchanger is truly frosted using only coil temperature and compressor current, leading to the phenomenon of defrosting even when no frosting has formed, thus affecting the performance of the air conditioning unit.

[0004] The lack of accuracy in determining whether a heat exchanger is truly frosted using existing defrosting methods has become a pressing technical problem that needs to be solved in the industry. Summary of the Invention

[0005] This invention provides a defrosting method, apparatus, and air conditioning equipment to solve the problem of poor accuracy in determining whether a heat exchanger is truly frosted in existing defrosting methods, thereby improving the accuracy of the determination.

[0006] According to one aspect of the present invention, a defrosting method is provided, comprising:

[0007] Acquire environmental parameter information and operating data of air conditioning equipment, wherein the operating data of air conditioning equipment includes parameter information of heat exchanger and current information of air conditioning equipment;

[0008] Based on the environmental parameter information, adjust the preset difference threshold and the preset current threshold;

[0009] Based on the difference between the environmental parameter information and the heat exchanger parameter information, the difference between these differences and a preset difference threshold, and the difference between the current information and a preset current threshold, the air conditioning equipment is controlled to defrost the heat exchanger.

[0010] Optionally, controlling the air conditioning equipment to defrost the heat exchanger based on the difference between the environmental parameter information and the heat exchanger parameter information, the difference between these differences and a preset difference threshold, and the difference between the current information and a preset current threshold, includes:

[0011] The evaporation temperature of the heat exchanger is calculated based on the pressure information of the heat exchanger; wherein, the parameter information of the heat exchanger includes the pressure information of the heat exchanger.

[0012] Based on the difference between the ambient temperature and the evaporation temperature, the difference between the ambient temperature and the preset temperature difference threshold, the difference between the fan current and the first preset current threshold, and the difference between the compressor current and the second preset current threshold, the air conditioning equipment is controlled to defrost the heat exchanger.

[0013] The environmental parameter information includes ambient temperature; the current information of the air conditioning equipment includes fan current and compressor current; the preset difference threshold includes a preset temperature difference threshold; and the preset current threshold includes a first preset current threshold and a second preset current threshold.

[0014] Optionally, controlling the air conditioning equipment to defrost the heat exchanger based on the difference between the ambient temperature and the evaporation temperature, the difference between the difference and a preset temperature difference threshold, the difference between the fan current and a first preset current threshold, and the difference between the compressor current and a second preset current threshold includes:

[0015] If the difference between the ambient temperature and the evaporation temperature is greater than the preset temperature difference threshold, and the fan current is greater than the first preset current threshold, and the compressor current is greater than the second preset current threshold, then the air conditioning equipment is controlled to defrost the heat exchanger.

[0016] If the difference between the ambient temperature and the evaporation temperature is less than or equal to the preset temperature difference threshold, or the fan current is less than or equal to the first preset current threshold, or the compressor current is less than or equal to the second preset current threshold, then it is determined that the heat exchanger is not frosted, and the air conditioning equipment is controlled to continue operating in heating mode.

[0017] Optionally, controlling the air conditioning equipment to defrost the heat exchanger based on the difference between the environmental parameter information and the heat exchanger parameter information, the difference between these differences and a preset difference threshold, and the difference between the current information and a preset current threshold includes:

[0018] Based on the difference between the ambient pressure and the pressure information of the heat exchanger, the difference between the difference and the preset pressure difference threshold, the difference between the fan current and the first preset current threshold, and the difference between the compressor current and the second preset current threshold, the air conditioning equipment is controlled to defrost the heat exchanger.

[0019] The environmental parameter information includes environmental pressure; the heat exchanger parameter information includes the pressure information of the heat exchanger; the air conditioning equipment current information includes fan current and compressor current; the preset difference threshold includes a preset pressure difference threshold; and the preset current threshold includes a first preset current threshold and a second preset current threshold.

[0020] Optionally, controlling the air conditioning equipment to defrost the heat exchanger based on the difference between the ambient pressure and the pressure information of the heat exchanger, the difference between the difference and a preset pressure difference threshold, the difference between the fan current and a first preset current threshold, and the difference between the compressor current and a second preset current threshold includes:

[0021] If the difference between the ambient pressure and the pressure information of the heat exchanger is greater than the preset pressure difference threshold, and the fan current is greater than the first preset current threshold, and the compressor current is greater than the second preset current threshold, then the air conditioning equipment is controlled to defrost the heat exchanger.

[0022] If the difference between the ambient pressure and the pressure information of the heat exchanger is less than or equal to the preset pressure difference threshold, or the fan current is less than or equal to the first preset current threshold, or the compressor current is less than or equal to the second preset current threshold, then it is determined that the heat exchanger is not frosted, and the air conditioning equipment is controlled to continue operating in heating mode.

[0023] Optionally, based on the environmental parameter information, the preset difference threshold and the preset current threshold are adjusted, including:

[0024] A first coefficient is determined based on the change in ambient humidity, and the preset difference threshold is updated based on the product of the first coefficient and the preset difference threshold.

[0025] The second coefficient is determined based on the change in ambient humidity, and the preset current threshold is updated based on the product of the second coefficient and the preset current threshold.

[0026] The environmental parameter information includes ambient humidity; the preset difference threshold decreases as the ambient humidity increases; and the preset current threshold decreases as the ambient humidity increases.

[0027] Optionally, after controlling the heat exchanger of the air conditioning equipment to defrost, the system further includes:

[0028] The operating data of the air conditioning equipment also includes the liquid pipe temperature and defrosting time of the air conditioning equipment;

[0029] If the liquid pipe temperature is greater than the second preset temperature and / or the defrosting time is greater than the first preset time, then the air conditioning equipment is controlled to stop defrosting the heat exchanger.

[0030] Optionally, after controlling the air conditioning equipment to stop defrosting the heat exchanger, the following steps are included:

[0031] The heating mode is activated after the air conditioning equipment has been shut down for a second preset time.

[0032] According to another aspect of the present invention, a defrosting device is provided, comprising:

[0033] The acquisition module is used to acquire environmental parameter information and operating data of the air conditioning equipment, wherein the operating data of the air conditioning equipment includes parameter information of the heat exchanger and current information of the air conditioning equipment;

[0034] The adjustment module is used to adjust the preset difference threshold and the preset current threshold according to the environmental parameter information;

[0035] The control module is used to control the air conditioning equipment to defrost the heat exchanger based on the difference between the environmental parameter information and the parameter information of the heat exchanger, the difference between the difference and a preset difference threshold, and the difference between the current information and a preset current threshold.

[0036] According to another aspect of the present invention, an air conditioning device is provided, including the defrosting device provided in any of the above embodiments.

[0037] The technical solution of this invention first acquires environmental parameter information and operating data of the air conditioning equipment, wherein the operating data includes parameter information of the heat exchanger and current information of the air conditioning equipment. Then, based on the environmental parameter information, a preset difference threshold and a preset current threshold are adjusted. Finally, based on the difference between the environmental parameter information and the heat exchanger parameter information, the difference between these two thresholds, and the difference between the current information and the current threshold, the air conditioning equipment is controlled to defrost the heat exchanger. By dynamically adjusting the judgment conditions for heat exchanger frosting based on environmental parameter information, different judgment conditions correspond to different environments, making the judgment more accurate and precisely determining the frosting state, avoiding the risk of misjudgment. By using the difference between the environmental parameter information and the heat exchanger parameter information, as well as the current of the air conditioning equipment, as the conditions for controlling the air conditioning equipment to defrost the heat exchanger, the accuracy of the judgment is further improved, preventing the air conditioning equipment from entering defrosting mode due to misjudgment.

[0038] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A flowchart of a defrosting method provided in an embodiment of the present invention;

[0041] Figure 2 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0042] Figure 3 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0043] Figure 4 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0044] Figure 5 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0045] Figure 6 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0046] Figure 7 A flowchart illustrating another defrosting method provided in this embodiment of the invention;

[0047] Figure 8 This is a schematic diagram of a defrosting device provided in an embodiment of the present invention. Detailed Implementation

[0048] 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.

[0049] 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 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.

[0050] Figure 1 This is a flowchart illustrating a defrosting method provided by an embodiment of the present invention, applicable to defrosting situations involving heat exchangers in air conditioning equipment. The method can be executed by a defrosting device, which can be implemented in hardware and / or software.

[0051] like Figure 1 As shown, the defrosting method provided in this embodiment of the invention includes:

[0052] S110. Obtain environmental parameter information and operating data of air conditioning equipment.

[0053] Specifically, when an air conditioner operates in heating mode, the refrigerant exchanges heat with the air through the outdoor heat exchanger, absorbing heat from the outdoor air. The compressor then compresses the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure refrigerant, which releases heat into the indoor condenser. Because the outdoor heat exchanger absorbs heat from the outside, the surrounding temperature is lower, causing water vapor in the air to condense and adhere to the surface of the outdoor heat exchanger, affecting its heat exchange capacity and thus reducing the air conditioner's performance.

[0054] Specifically, in low ambient temperatures, heat exchangers may experience frost buildup, which can affect the heating efficiency of air conditioning equipment. Therefore, timely defrosting of the heat exchanger is necessary. Whether defrosting is required depends on the environmental parameters and operating data of the air conditioning unit. Therefore, it is necessary to first obtain the environmental parameters and operating data of the air conditioning unit. The operating data can include the parameters of the heat exchanger and the current information of the air conditioning unit. Environmental parameters can include information about the current environment in which the air conditioning unit is located, such as ambient temperature and pressure. The parameters of the heat exchanger can be the pressure of the heat exchange or the evaporation temperature. The current information of the air conditioning unit can be the compressor current and the fan current. Ambient temperature and humidity can be measured by outdoor sensors. The pressure of the heat exchanger can be measured by a pressure sensor, and the evaporation temperature can be calculated from the low-pressure value of the heat exchanger. The fan current and compressor current can be obtained in real time based on the current readings.

[0055] S120. Adjust the preset difference threshold and preset current threshold according to the environmental parameter information.

[0056] Specifically, the environment in which the air conditioning unit operates affects the frosting of the heat exchanger; the degree of frosting varies depending on the outdoor environment. Therefore, before determining whether the heat exchanger has frosted, it is necessary to adjust the frosting threshold based on environmental parameters. In existing technologies, a fixed threshold is typically used to determine whether a heat exchanger has frosted. However, the degree of frosting varies under different environments. In environments with high humidity, the air contains more water vapor, making the heat exchanger surface more prone to frosting. By acquiring environmental parameters and dynamically adjusting the frosting threshold, the determination becomes more accurate and precise in identifying the frosting status. This frosting threshold can include a preset difference threshold and a preset current threshold. For example, in outdoor environments with high humidity, the air contains more water vapor, making the heat exchanger more prone to frosting; therefore, the preset difference threshold and preset current threshold need to be dynamically adjusted in real time based on the ambient humidity.

[0057] S130. Based on the difference between environmental parameter information and heat exchanger parameter information, the difference between the difference and a preset difference threshold, and the difference between current information and a preset current threshold, control the air conditioning equipment to defrost the heat exchanger.

[0058] Specifically, after acquiring outdoor environmental parameters and operating data of the air conditioning equipment, and adjusting the preset difference threshold and preset current threshold based on the environmental parameters, the system can determine whether frost has formed on the heat exchanger by analyzing the relationship between the difference between the environmental parameters and the heat exchanger parameters and the preset difference threshold, as well as the relationship between the air conditioning equipment's current information and the preset current threshold. This allows the system to control the air conditioning equipment to perform defrosting operations on the heat exchanger. It not only determines whether to defrost the heat exchanger based on the difference between the environmental parameters and the heat exchanger parameters, but also controls the defrosting process by analyzing the air conditioning equipment's current information. By using multiple conditions to jointly control the air conditioning equipment to defrost the heat exchanger, the system improves the accuracy of defrosting.

[0059] The defrosting method provided in this invention first acquires environmental parameter information and operating data of the air conditioning equipment, including parameter information of the heat exchanger and current information of the air conditioning equipment. Then, based on the environmental parameter information, a preset difference threshold and a preset current threshold are adjusted. Finally, based on the difference between the environmental parameter information and the heat exchanger parameter information, the difference between these two thresholds, and the difference between the current information and the current threshold, the air conditioning equipment is controlled to defrost the heat exchanger. By dynamically adjusting the frost detection conditions of the heat exchanger using environmental parameter information, different detection conditions are applied to different environments, making the judgment more accurate and precisely determining whether the heat exchanger is frosted, thus avoiding the risk of misjudgment. By using the difference between the environmental parameter information and the heat exchanger parameter information, as well as the current of the air conditioning equipment, as the conditions for controlling the defrosting of the heat exchanger, the accuracy of the judgment is further improved, preventing the air conditioning equipment from entering defrosting mode due to misjudgment.

[0060] Optional, Figure 2 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to flowchart illustration]. Figure 2 The defrosting method provided in this embodiment of the invention includes:

[0061] S210. Obtain environmental parameter information and operating data of air conditioning equipment.

[0062] S220. Adjust the preset difference threshold and preset current threshold according to the environmental parameter information.

[0063] S230. Calculate the evaporation temperature of the heat exchanger based on the pressure information of the heat exchanger.

[0064] Specifically, during the operation of air conditioning equipment, the pressure information of the heat exchanger can be obtained through a pressure sensor, and the evaporation temperature of the heat exchanger can be calculated and determined based on this pressure information. The heat exchanger's parameter information includes its pressure information, which refers to the pressure of the refrigerant within the heat exchanger. A pressure sensor can be installed in the heat exchanger to obtain the current refrigerant pressure. After determining the type of refrigerant used in the air conditioning equipment, there is a one-to-one correspondence between the refrigerant pressure and the evaporation temperature; they are directly proportional, with higher refrigerant pressure resulting in a higher evaporation temperature. Therefore, the evaporation temperature of the heat exchanger can be determined using its pressure information.

[0065] S240. Based on the difference between the ambient temperature and the evaporation temperature, the difference between the ambient temperature and the preset temperature difference threshold, the difference between the fan current and the first preset current threshold, and the difference between the compressor current and the second preset current threshold, control the air conditioning equipment to defrost the heat exchanger.

[0066] Specifically, after calculating the evaporator's evaporation temperature, the system can control whether the air conditioning equipment defrosts the heat exchanger based on the difference between the ambient temperature and the evaporation temperature, the difference between the ambient temperature and the preset temperature difference threshold, the difference between the fan current and the first preset current threshold, and the difference between the compressor current and the second preset current threshold. The environmental parameters include the ambient temperature. The air conditioning equipment's current information includes the fan current and the compressor current. The preset temperature difference threshold includes the preset temperature difference threshold. The preset current threshold includes the first preset current threshold and the second preset current threshold. The fan current, based on a constant airflow speed, increases with higher air pressure and lower airflow, and vice versa. The compressor current varies according to the high and low pressure difference; a larger high and low pressure difference results in a larger current, and a smaller high and low pressure difference results in a smaller current. The difference between the ambient temperature and the evaporation temperature, the magnitude of the fan current, and the magnitude of the compressor current can be used to determine whether the heat exchanger is frosting. Only when all three conditions mentioned above are met can it be determined that frost has formed on the surface of the heat exchanger, requiring the air conditioning unit to switch to cooling mode to defrost the heat exchanger. During defrosting, the heat exchanger's fan stops operating. The preset temperature difference threshold is determined by environmental parameter information. The first and second preset current thresholds are also determined by environmental parameter information; they may or may not be equal, and no restrictions are imposed here.

[0067] Optional, Figure 3 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 3The defrosting method provided in this embodiment of the invention includes:

[0068] S310. Obtain environmental parameter information and operating data of air conditioning equipment.

[0069] S320. Adjust the preset difference threshold and preset current threshold according to the environmental parameter information.

[0070] S330. Calculate the evaporation temperature of the heat exchanger based on the pressure information of the heat exchanger.

[0071] S340. If the difference between the ambient temperature and the evaporation temperature is greater than the preset temperature difference threshold, and the fan current is greater than the first preset current threshold, and the compressor current is greater than the second preset current threshold, then control the air conditioning equipment to defrost the heat exchanger.

[0072] Specifically, the defrosting process of the air conditioning unit is jointly controlled based on the difference between the ambient temperature and the evaporation temperature, the difference between these values ​​and a preset temperature difference threshold, the difference between the fan current and a first preset current threshold, and the difference between the compressor current and a second preset current threshold. If the difference between the ambient temperature and the evaporation temperature is greater than the preset temperature difference threshold, and the fan current is greater than the first preset current threshold, and the compressor current is greater than the second preset current threshold, it indicates that frost has formed on the surface of the heat exchanger. In this case, the air conditioning unit needs to switch to cooling mode to defrost the heat exchanger. In cooling mode, the outdoor heat exchanger releases heat, which, along with the high-temperature refrigerant, defrosts the heat exchanger. Only when all three conditions are met—the difference between the ambient temperature and the evaporation temperature being greater than the preset temperature difference threshold, the fan current being greater than the first preset current threshold, and the compressor current being greater than the second preset current threshold—can frost formation on the heat exchanger be confirmed. If any one of these conditions is not met, the air conditioning unit will not trigger defrosting of the heat exchanger.

[0073] For example, the preset temperature difference threshold can be 10℃, the first preset current threshold can be 3A, and the second preset current threshold can be 10A. When the ambient temperature is 5℃, the evaporation temperature is -8℃, and the difference between the ambient temperature and the array temperature is 13℃, which is greater than the preset temperature difference threshold of 10℃, the fan current is 4A, which is greater than the first preset current threshold of 3A, and the compressor current is 12A, which is greater than the second preset current threshold of 10A. At this time, it is determined that the heat exchanger is frosted, and the air conditioning equipment is controlled to start the cooling mode to defrost the heat exchanger.

[0074] S350. If the difference between the ambient temperature and the evaporation temperature is less than or equal to the preset temperature difference threshold, or the fan current is less than or equal to the first preset current threshold, or the compressor current is less than or equal to the second preset current threshold, then it is determined that the heat exchanger is not frosted, and the air conditioning equipment is controlled to continue to operate in heating mode.

[0075] Specifically, in determining whether the air conditioning unit needs to defrost the heat exchanger, if the difference between the ambient temperature and the evaporation temperature is less than or equal to a preset temperature difference threshold, or the fan current is less than or equal to a first preset current threshold, or the compressor current is less than or equal to a second preset current threshold, it indicates that the heat exchanger is not frosted, and the air conditioning unit continues to operate in heating mode. In other words, if any one of the following three conditions is met—that the difference between the ambient temperature and the evaporation temperature is less than or equal to the preset temperature difference threshold, the fan current is less than or equal to the first preset current threshold, or the compressor current is less than or equal to the second preset current threshold—it can be determined that the heat exchanger is not frosted and defrosting is not required.

[0076] For example, the preset temperature difference threshold can be 10℃, the first preset current threshold can be 3A, and the second preset current threshold can be 10A. If the ambient temperature is 5℃ and the evaporation temperature is -5℃, the difference between the ambient temperature and the evaporation temperature is 10℃, which equals the preset temperature difference threshold of 10℃. In this case, regardless of whether the fan current is less than or equal to the first preset current threshold or the compressor current is less than or equal to the second preset current threshold, it is determined that the heat exchanger is not frosted. If the fan current is 2A, which is less than the first preset current threshold of 3A, then regardless of whether the other two conditions are met, it is determined that the heat exchanger is frosted. If the fan current is 8A, which is less than the second preset current threshold of 10A, then regardless of whether the other two conditions are met, it is determined that the heat exchanger is frosted.

[0077] Optional, Figure 4 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 4 The defrosting method provided in this embodiment of the invention includes:

[0078] S410: Obtain environmental parameter information and operating data of air conditioning equipment.

[0079] S420. Adjust the preset difference threshold and preset current threshold according to the environmental parameter information.

[0080] S430. Based on the difference between the ambient pressure and the pressure information of the heat exchanger, the difference between the difference and the preset pressure difference threshold, the difference between the fan current and the first preset current threshold, and the difference between the compressor current and the second preset current threshold, control the air conditioning equipment to defrost the heat exchanger.

[0081] Specifically, during the operation of air conditioning equipment, the presence or absence of frost on the heat exchanger can be determined based on the difference between the ambient pressure and the heat exchanger's pressure information, the difference between these differences and a preset pressure difference threshold, the difference between the fan current and a first preset current threshold, and the difference between the compressor current and a second preset current threshold. This allows for the control of the air conditioning equipment to defrost the heat exchanger. In other words, the presence or absence of frost on the heat exchanger surface can also be determined by the difference between the ambient pressure and the heat exchanger's pressure information, the magnitude of the fan current, and the magnitude of the compressor current. The environmental parameters include ambient pressure. The heat exchanger parameters include the heat exchanger's pressure information. The air conditioning equipment's current information includes the fan current and compressor current. The preset difference thresholds include a preset pressure difference threshold, and the preset current thresholds include a first preset current threshold and a second preset current threshold. The preset pressure difference threshold is determined by the environmental parameters. The first and second preset current thresholds are also determined by the environmental parameters; they may or may not be equal, and no restrictions are imposed here.

[0082] Optional, Figure 5 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 5 The defrosting method provided in this embodiment of the invention includes:

[0083] S510: Obtain environmental parameter information and operating data of air conditioning equipment.

[0084] S520. Adjust the preset difference threshold and preset current threshold according to environmental parameter information.

[0085] S530. If the difference between the ambient pressure and the pressure information of the heat exchanger is greater than the preset pressure difference threshold, and the fan current is greater than the first preset current threshold, and the compressor current is greater than the second preset current threshold, then control the air conditioning equipment to defrost the heat exchanger.

[0086] Specifically, in determining whether the heat exchanger is frosting based on the difference between the ambient pressure and the heat exchanger's pressure information, the difference between these differences and a preset pressure difference threshold, the difference between the fan current and a first preset current threshold, and the difference between the compressor current and a second preset current threshold, the process is as follows: If the difference between the ambient pressure and the heat exchanger's pressure information is greater than the preset pressure difference threshold, and the fan current is greater than the first preset current threshold and the compressor current is greater than the second preset current threshold, then it indicates that the heat exchanger is frosting, and the air conditioning equipment needs to be switched to cooling mode to defrost the heat exchanger. In other words, frosting can only be determined when all three conditions are met: the difference between the ambient pressure and the heat exchanger's pressure information is greater than the preset pressure difference threshold, the fan current is greater than the first preset current threshold, and the compressor current is greater than the second preset current threshold.

[0087] For example, the preset pressure difference threshold is 30 kPa, the first preset current threshold can be 3 A, and the second preset current threshold can be 10 A. If the ambient pressure is 100 kPa and the heat exchanger pressure is 60 kPa, the difference between the ambient pressure and the heat exchanger pressure is 40 kPa, which is greater than the preset pressure difference threshold of 30 kPa. The fan current is 4 A, which is greater than the first preset current threshold of 3 A, and the compressor current is 12 A, which is greater than the second preset current threshold of 10 A. At this point, it is determined that the heat exchanger is frosted, and the air conditioning unit is controlled to turn on the cooling mode to defrost the heat exchanger.

[0088] S540. If the difference between the ambient pressure and the pressure information of the heat exchanger is less than or equal to the preset pressure difference threshold, or the fan current is less than or equal to the first preset current threshold, or the compressor current is less than or equal to the second preset current threshold, then it is determined that the heat exchanger is not frosted, and the air conditioning equipment is controlled to continue to operate in heating mode.

[0089] Specifically, in determining whether the air conditioning unit needs to defrost the heat exchanger, if the difference between the ambient pressure and the heat exchanger's pressure is less than or equal to a preset pressure difference threshold, or the fan current is less than or equal to a first preset current threshold, or the compressor current is less than or equal to a second preset current threshold, then it is determined that the heat exchanger is not frosted, and the air conditioning unit continues to operate in heating mode. In other words, if any one of the following conditions is met—that the difference between the ambient pressure and the heat exchanger's pressure is less than or equal to a preset pressure difference threshold, the fan current is less than or equal to a first preset current threshold, or the compressor current is less than or equal to a second preset current threshold—it can be determined that the heat exchanger is not frosted, and defrosting is unnecessary.

[0090] For example, the preset pressure difference threshold can be 30 kPa, the first preset current threshold can be 3 A, and the second preset current threshold can be 10 A. If the ambient pressure is 100 kPa and the heat exchanger pressure is 70 kPa, the difference between the ambient pressure and the heat exchanger pressure is 30 kPa, which equals the preset pressure difference threshold of 30 kPa. Regardless of whether the other two conditions are met, it is determined that the heat exchanger is not frosted. If the fan current is 2 A, which is less than the first preset current threshold of 3 A, the heat exchanger is determined to be frosted regardless of whether the other two conditions are met. If the fan current is 8 A, which is less than the second preset current threshold of 10 A, the heat exchanger is determined to be frosted regardless of whether the other two conditions are met.

[0091] Optional, Figure 6 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 6 The defrosting method provided in this embodiment of the invention includes:

[0092] S610: Obtain environmental parameter information and operating data of air conditioning equipment.

[0093] S620. Determine the first coefficient based on the change in ambient humidity, and update the preset difference threshold based on the product of the first coefficient and the preset difference threshold.

[0094] Specifically, after obtaining the environmental parameter information of the air conditioning equipment, the frost formation on the heat exchanger varies under different environmental parameter conditions, requiring adjustment of the preset difference threshold based on the ambient humidity. The environmental parameter information can include ambient humidity. A first coefficient for the preset difference threshold can be determined based on the change in ambient humidity, and then the preset difference threshold is updated in real time using this first coefficient and the preset difference threshold. The preset difference threshold can include a preset temperature difference threshold and a preset pressure difference threshold, which can be updated based on the first coefficient. For example, if the change in ambient humidity is +10%, and the first coefficient is 0.9, then the product of 0.9 and the original preset temperature difference threshold is used as the updated preset temperature difference threshold, and the product of 0.9 and the original preset pressure difference threshold is used as the updated preset pressure difference threshold.

[0095] S630. Determine the second coefficient based on the change in ambient humidity, and update the preset current threshold based on the product of the second coefficient and the preset current threshold.

[0096] Specifically, after obtaining the environmental parameter information of the air conditioning equipment, a second coefficient needs to be determined based on the change in ambient humidity. The preset current threshold is then updated in real time based on the product of the second coefficient and a preset current threshold. The preset current threshold can include a first preset current threshold and a second preset current threshold. After determining the second coefficient, the first preset current threshold can be updated based on the second coefficient and the first preset current threshold, and the second preset current threshold can be updated based on the second coefficient and the second preset current threshold. For example, when the change in ambient humidity is -10%, the second coefficient is 1.1. The product of 1.1 and the original first preset current threshold is used as the updated first preset current threshold, and the product of 1.1 and the original second preset current threshold is used as the updated second preset current threshold. The preset difference threshold decreases as ambient humidity increases, and the preset current threshold also decreases as ambient humidity increases. The first coefficient and the second coefficient can be equal or unequal; no limitation is made here.

[0097] S640. Based on the difference between environmental parameter information and heat exchanger parameter information, the difference between these differences and a preset difference threshold, and the difference between current information and a preset current threshold, control the air conditioning equipment to defrost the heat exchanger.

[0098] Optional, Figure 7 A flowchart illustrating another defrosting method provided in this embodiment of the invention. Based on the above embodiments, see [link to relevant documentation]. Figure 7 The defrosting method provided in this embodiment of the invention includes:

[0099] S710: Obtain environmental parameter information and operating data of air conditioning equipment.

[0100] S720. Adjust the preset difference threshold and preset current threshold according to environmental parameter information.

[0101] S730: Based on the difference between environmental parameter information and heat exchanger parameter information, the difference between these differences and a preset difference threshold, and the difference between current information and a preset current threshold, control the air conditioning equipment to defrost the heat exchanger.

[0102] S740. If the liquid pipe temperature is greater than the second preset temperature and / or the defrosting time is greater than the first preset time, control the air conditioning equipment to stop defrosting the heat exchanger.

[0103] Specifically, when the air conditioning unit is defrosting the heat exchanger in cooling mode, it is also necessary to control the unit to stop defrosting. This can be determined by the liquid line temperature or the defrosting time. The operating data for the air conditioning unit includes the liquid line temperature and the defrosting time. After the air conditioning unit begins defrosting the heat exchanger, it is necessary to obtain the liquid line temperature and the defrosting time. The relationship between the liquid line temperature and a second preset temperature, or the relationship between the defrosting time and a first preset time, can be used to determine whether to stop defrosting the heat exchanger. If the liquid line temperature is higher than the second preset temperature, it means the heat exchanger no longer needs defrosting, and the air conditioning unit should stop defrosting. If the defrosting time exceeds the first preset time, the air conditioning unit should also stop defrosting. The liquid line temperature refers to the temperature of the refrigerant in the pipes connecting the indoor and outdoor heat exchangers, and can be obtained using a temperature sensor. For example, the second preset temperature can be 20°C, and the first preset time can be 10 minutes. If the liquid pipe temperature is 30°C, which is greater than the second preset temperature of 20°C, the air conditioning equipment will also be controlled to stop defrosting.

[0104] S750: The heating mode will be turned on after the air conditioning equipment has been shut down for the second preset time.

[0105] Specifically, after the air conditioning unit stops defrosting the heat exchanger, the frost on the surface of the heat exchanger melts into condensate during the defrosting process. This condensate needs to be completely drained before the air conditioning unit can switch to heating mode to prevent it from freezing again on the heat exchanger surface. After the air conditioning unit stops defrosting, it is shut down for a second preset time to drain the condensate from the heat exchanger surface before restarting the air conditioning unit and switching to heating mode. The second preset time is not specifically limited in this embodiment and can be set according to actual needs. For example, the second preset time can be 2 minutes; after the air conditioning unit finishes defrosting, it is shut down for 2 minutes to allow the condensate to drain completely before restarting the air conditioning unit.

[0106] The defrosting method provided in this invention improves the accuracy of the judgment by dynamically adjusting the environmental humidity to determine whether the heat exchanger is frosted, thus avoiding the risk of misjudgment. By combining environmental parameter information with the relationship between the heat exchanger's pressure information or evaporation temperature, as well as the fan current and compressor current, the method controls the air conditioning equipment to defrost the heat exchanger, further improving the accuracy of the judgment and preventing the air conditioning equipment from entering defrosting mode due to misjudgment.

[0107] This invention also provides a defrosting device. Figure 8 This is a schematic diagram of a defrosting device provided in an embodiment of the present invention. Based on the above embodiments, as follows... Figure 8As shown, the defrosting device 100 includes:

[0108] The acquisition module 10 is used to acquire environmental parameter information and operating data of the air conditioning equipment, wherein the operating data includes parameter information of the heat exchanger and current information of the air conditioning equipment;

[0109] The adjustment module 20 is used to adjust the preset difference threshold and the preset current threshold according to environmental parameter information;

[0110] The control module 30 is used to control the air conditioning equipment to defrost the heat exchanger based on the difference between environmental parameter information and heat exchanger parameter information, the difference between the difference and a preset difference threshold, and the difference between the current information and a preset current threshold.

[0111] Optionally, the control module 30 is specifically used to calculate the evaporation temperature of the heat exchanger based on the pressure information of the heat exchanger; wherein the parameter information of the heat exchanger includes the pressure information of the heat exchanger; and to control the air conditioning equipment to defrost the heat exchanger based on the difference between the ambient temperature and the evaporation temperature, the difference between the ambient temperature and the evaporation temperature and the preset temperature difference threshold, the difference between the fan current and the first preset current threshold, and the difference between the compressor current and the second preset current threshold.

[0112] Specifically, the control module 30 can determine whether the heat exchanger is frosted by combining the difference between the ambient temperature and the evaporation temperature, the magnitude of the fan current, and the magnitude of the compressor current. If the difference between the ambient temperature and the evaporation temperature is greater than a preset temperature difference threshold, and the fan current is greater than a first preset current threshold, and the compressor current is greater than a second preset current threshold, it indicates that frost has formed on the surface of the heat exchanger, and the air conditioning equipment needs to be switched to the cooling module to defrost the heat exchanger. If the difference between the ambient temperature and the evaporation temperature is less than or equal to the preset temperature difference threshold, or the fan current is less than or equal to the first preset current threshold, or the compressor current is less than or equal to the second preset current threshold, it indicates that the heat exchanger is not frosted, and the air conditioning equipment continues to operate in heating mode.

[0113] Optionally, the control module 30 is specifically used to control the air conditioning equipment to defrost the heat exchanger based on the difference between the ambient pressure and the pressure information of the heat exchanger, the difference between the difference and the preset pressure difference threshold, the difference between the fan current and the first preset current threshold, and the difference between the compressor current and the second preset current threshold.

[0114] Specifically, during the operation of the air conditioning equipment, the control module 30 can determine whether the heat exchanger is frosted based on the difference between the ambient pressure and the heat exchanger's pressure information, the difference between these differences and a preset pressure difference threshold, the difference between the fan current and a first preset current threshold, and the difference between the compressor current and a second preset current threshold. This allows the control module to defrost the heat exchanger. If the difference between the ambient pressure and the heat exchanger's pressure information is greater than the preset pressure difference threshold, and the fan current is greater than the first preset current threshold and the compressor current is greater than the second preset current threshold, then the heat exchanger is frosted, and the air conditioning equipment needs to be switched to cooling mode to defrost the heat exchanger. If the difference between the ambient pressure and the heat exchanger's pressure information is less than or equal to the preset pressure difference threshold, or the fan current is less than or equal to the first preset current threshold, or the compressor current is less than or equal to the second preset current threshold, then the heat exchanger is determined not to be frosted, and the air conditioning equipment continues to operate in heating mode.

[0115] The defrosting device provided in this invention acquires environmental parameter information and air conditioning equipment operating data through an acquisition module, dynamically adjusts preset difference thresholds and preset current thresholds using an adjustment module, and finally controls the air conditioning equipment to defrost the heat exchanger based on the relationship between the difference between the environmental parameter information and the heat exchanger parameter information and the preset difference threshold, as well as the relationship between the current information and the preset current threshold. This not only improves the accuracy of judgment and avoids the air conditioning equipment entering defrosting mode due to misjudgment, but also improves user comfort.

[0116] Based on the same inventive concept, embodiments of the present invention also provide an air conditioning device, including any of the defrosting devices described above. The air conditioning device provided by the embodiments of the present invention can achieve the same technical effects as the defrosting device provided by the above-described embodiments, and will not be repeated here.

[0117] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A defrosting method, characterized in that, include: Acquire environmental parameter information and operating data of air conditioning equipment, wherein the operating data of air conditioning equipment includes parameter information of heat exchanger and current information of air conditioning equipment; Based on the environmental parameter information, adjust the preset difference threshold and the preset current threshold; Based on the difference between the environmental parameter information and the heat exchanger parameter information, the difference between these differences and a preset difference threshold, and the difference between the current information and a preset current threshold, the air conditioning equipment is controlled to defrost the heat exchanger.

2. The defrosting method according to claim 1, characterized in that, The step of controlling the air conditioning equipment to defrost the heat exchanger based on the difference between the environmental parameter information and the heat exchanger parameter information, the difference between these differences and a preset difference threshold, and the difference between the current information and a preset current threshold, includes: The evaporation temperature of the heat exchanger is calculated based on the pressure information of the heat exchanger; wherein, the parameter information of the heat exchanger includes the pressure information of the heat exchanger. Based on the difference between the ambient temperature and the evaporation temperature, the difference between the ambient temperature and the preset temperature difference threshold, the difference between the fan current and the first preset current threshold, and the difference between the compressor current and the second preset current threshold, the air conditioning equipment is controlled to defrost the heat exchanger. The environmental parameter information includes ambient temperature; the current information of the air conditioning equipment includes fan current and compressor current; the preset difference threshold includes a preset temperature difference threshold; and the preset current threshold includes a first preset current threshold and a second preset current threshold.

3. The defrosting method according to claim 2, characterized in that, Controlling the air conditioning equipment to defrost the heat exchanger based on the difference between the ambient temperature and the evaporation temperature, the difference between the difference and a preset temperature difference threshold, the difference between the fan current and a first preset current threshold, and the difference between the compressor current and a second preset current threshold; If the difference between the ambient temperature and the evaporation temperature is greater than the preset temperature difference threshold, and the fan current is greater than the first preset current threshold, and the compressor current is greater than the second preset current threshold, then the air conditioning equipment is controlled to defrost the heat exchanger. If the difference between the ambient temperature and the evaporation temperature is less than or equal to the preset temperature difference threshold, or the fan current is less than or equal to the first preset current threshold, or the compressor current is less than or equal to the second preset current threshold, then it is determined that the heat exchanger is not frosted, and the air conditioning equipment is controlled to continue operating in heating mode.

4. The defrosting method according to claim 1, characterized in that, The step of controlling the air conditioning equipment to defrost the heat exchanger based on the difference between the environmental parameter information and the heat exchanger parameter information, the difference between the difference and a preset difference threshold, and the difference between the current information and a preset current threshold includes: Based on the difference between the ambient pressure and the pressure information of the heat exchanger, the difference between the difference and the preset pressure difference threshold, the difference between the fan current and the first preset current threshold, and the difference between the compressor current and the second preset current threshold, the air conditioning equipment is controlled to defrost the heat exchanger. The environmental parameter information includes environmental pressure; the heat exchanger parameter information includes the pressure information of the heat exchanger; the air conditioning equipment current information includes fan current and compressor current; the preset difference threshold includes a preset pressure difference threshold; and the preset current threshold includes a first preset current threshold and a second preset current threshold.

5. The defrosting method according to claim 4, characterized in that, Based on the difference between the ambient pressure and the pressure information of the heat exchanger, the difference between these differences and a preset pressure difference threshold, the difference between the fan current and a first preset current threshold, and the difference between the compressor current and a second preset current threshold, controlling the air conditioning equipment to defrost the heat exchanger includes: If the difference between the ambient pressure and the pressure information of the heat exchanger is greater than the preset pressure difference threshold, and the fan current is greater than the first preset current threshold, and the compressor current is greater than the second preset current threshold, then the air conditioning equipment is controlled to defrost the heat exchanger. If the difference between the ambient pressure and the pressure information of the heat exchanger is less than or equal to the preset pressure difference threshold, or the fan current is less than or equal to the first preset current threshold, or the compressor current is less than or equal to the second preset current threshold, then it is determined that the heat exchanger is not frosted, and the air conditioning equipment is controlled to continue operating in heating mode.

6. The defrosting method according to claim 1, characterized in that, Based on the environmental parameter information, adjust the preset difference threshold and the preset current threshold, including: A first coefficient is determined based on the change in ambient humidity, and the preset difference threshold is updated based on the product of the first coefficient and the preset difference threshold. The second coefficient is determined based on the change in ambient humidity, and the preset current threshold is updated based on the product of the second coefficient and the preset current threshold. The environmental parameter information includes ambient humidity; the preset difference threshold decreases as the ambient humidity increases; and the preset current threshold decreases as the ambient humidity increases.

7. The defrosting method according to claim 1, characterized in that, After the heat exchanger of the air conditioning equipment is defrosted, the system further includes: The operating data of the air conditioning equipment also includes the liquid pipe temperature and defrosting time of the air conditioning equipment; If the liquid pipe temperature is greater than the second preset temperature and / or the defrosting time is greater than the first preset time, then the air conditioning equipment is controlled to stop defrosting the heat exchanger.

8. The defrosting method according to claim 7, characterized in that, After controlling the air conditioning equipment to stop defrosting the heat exchanger, the following steps are included: The heating mode is activated after the air conditioning equipment has been shut down for a second preset time.

9. A defrosting device, characterized in that, include: The acquisition module is used to acquire environmental parameter information and operating data of the air conditioning equipment, wherein the operating data of the air conditioning equipment includes parameter information of the heat exchanger and current information of the air conditioning equipment; The adjustment module is used to adjust the preset difference threshold and the preset current threshold according to the environmental parameter information; The control module is used to control the air conditioning equipment to defrost the heat exchanger based on the difference between the environmental parameter information and the parameter information of the heat exchanger, the difference between the difference and a preset difference threshold, and the difference between the current information and a preset current threshold.

10. An air conditioning device, characterized in that, Includes the defrosting device as described in claim 9.

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