Self-adaptive defrosting and oil return collaborative control method and device of heat pump unit and computer storage medium

Abstract

The application relates to the technical field of heat pump units, and discloses a self-adaptive defrosting and oil return collaborative control method and device of a heat pump unit and a computer storage medium, the method comprising the following steps: acquiring a current outdoor heat exchanger coil temperature parameter of the heat pump unit in a defrosting operation state, and judging whether the heat pump unit meets defrosting exit conditions according to the current outdoor heat exchanger coil temperature parameter; if yes, acquiring target operation parameters of a compressor of the heat pump unit, and judging whether the heat pump unit meets oil return time conditions according to the target operation parameters; if yes, controlling the heat pump unit to perform a defrosting exit operation, and after the operation is completed, controlling the heat pump unit to perform oil return, so that a self-adaptive defrosting and oil return collaborative control process of the heat pump unit is realized, the number of unnecessary working condition switching times of the heat pump unit is reduced, the heat pump unit can continuously operate, indoor temperature fluctuation is reduced, and oil gas recovery efficiency is improved, so that the operation energy efficiency and reliability of the heat pump unit are improved.

Description

Technical Field

[0001] This invention relates to the field of heat pump unit technology, and in particular to an adaptive defrosting and oil return coordinated control method, device and computer storage medium for heat pump units. Background Technology

[0002] In the operation of heat pump units, defrosting and compressor oil return are two key aspects ensuring reliable operation. Defrosting eliminates frost on the heat exchanger surface, reducing heat exchange efficiency degradation. Oil return involves sending the lubricating oil that has migrated with the refrigerant to the pipeline back to the compressor, preventing wear or burnout due to insufficient oil. Currently, defrosting and oil return controls in the industry often operate independently, with their triggering conditions and execution processes unrelated, leading to significant technical shortcomings. Specifically, independent operation often requires the unit to undergo two operating condition switches: for example, after the defrosting process ends, the unit must first return to normal operation, and then shut down to perform the oil return operation once the oil return triggering conditions are met. This process not only generates additional energy loss but also interrupts continuous unit operation, causing indoor temperature fluctuations or decreased oil recovery efficiency, making it difficult to balance system energy efficiency and reliability.

[0003] Therefore, there is an urgent need for an adaptive defrosting and oil return coordinated control technology solution for heat pump units to address the shortcomings of the existing independent control mode. Summary of the Invention

[0004] This invention provides an adaptive defrosting and oil return coordinated control method, device, and computer storage medium for heat pump units, which reduces the number of unnecessary operating condition switching of heat pump units, enabling continuous operation of the units, reducing indoor temperature fluctuations, and improving oil and gas recovery efficiency, thereby improving the operating energy efficiency and reliability of heat pump units.

[0005] To address the aforementioned technical problems, the first aspect of this invention discloses an adaptive defrosting and oil return coordinated control method for a heat pump unit, the method comprising:

[0006] When the heat pump unit is in defrosting operation, the current outdoor heat exchanger coil temperature parameter of the heat pump unit is obtained, and based on the current outdoor heat exchanger coil temperature parameter, it is determined whether the heat pump unit meets the preset defrosting exit conditions.

[0007] When it is determined that the heat pump unit meets the defrost exit condition, the target operating parameters of the compressor of the heat pump unit are obtained, and based on the target operating parameters, it is determined whether the heat pump unit meets the preset oil return time condition; the target operating parameters include operating frequency parameters and operating duration parameters;

[0008] When it is determined that the heat pump unit meets the oil return time condition, the heat pump unit is controlled to perform a defrost exit operation, and after the defrost exit operation is completed, the heat pump unit is controlled to perform an oil return operation.

[0009] As an optional implementation, in the first aspect of the present invention, determining whether the heat pump unit meets the preset defrost exit conditions based on the current outdoor heat exchanger coil temperature parameter includes:

[0010] The system obtains the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, and current defrosting duration parameters of the heat pump unit; the current outdoor heat exchanger coil frosting parameters include at least one of the following: current outdoor heat exchanger coil frosting thickness parameters, current outdoor heat exchanger coil frosting location parameters, and current outdoor heat exchanger coil frosting density parameters.

[0011] Based on the current outdoor heat exchanger coil frosting parameters, the outdoor environmental parameters, and the current outdoor heat exchanger coil temperature parameters, predict the defrosting time requirement parameters for the heat pump unit, and determine whether the current defrosting time parameter is greater than or equal to the defrosting time requirement parameters.

[0012] When it is determined that the current defrosting duration parameter is greater than or equal to the defrosting duration requirement parameter, the heat pump unit is determined to meet the preset defrosting exit condition.

[0013] As an optional implementation, in the first aspect of the present invention, predicting the defrosting time requirement parameters of the heat pump unit based on the current outdoor heat exchanger coil frosting parameters, the outdoor environmental parameters, and the current outdoor heat exchanger coil temperature parameters includes:

[0014] Obtain the refrigerant flow parameters corresponding to the current outdoor heat exchanger of the heat pump unit; the refrigerant flow parameters include at least one of the following: refrigerant flow temperature parameters, refrigerant flow velocity parameters, refrigerant flow state parameters, and refrigerant flow cross-sectional parameters.

[0015] Based on the current outdoor heat exchanger coil frosting parameters, the outdoor environmental parameters, the current outdoor heat exchanger coil temperature parameters, and the refrigerant flow parameters, predict the outdoor heat exchanger defrosting rate parameters of the heat pump unit.

[0016] Based on the current outdoor heat exchanger coil frosting parameters and the outdoor heat exchanger defrosting rate parameters, the defrosting time requirement parameters of the heat pump unit are predicted.

[0017] As an optional implementation, in the first aspect of the present invention, determining whether the heat pump unit meets the preset oil return time condition based on the target operating parameters includes:

[0018] Based on the operating frequency parameters, target operating frequency parameters that are less than or equal to the preset oil return activation frequency threshold are selected from the operating frequency parameters.

[0019] Based on the target operating frequency parameter and the operating time parameter, determine the cumulative operating time parameter corresponding to the target operating frequency parameter, and determine whether the cumulative operating time parameter is greater than or equal to a preset cumulative operating time threshold.

[0020] When it is determined that the cumulative running time parameter is greater than or equal to the cumulative running time threshold, the heat pump unit is determined to meet the preset oil return time condition.

[0021] As an optional implementation, in the first aspect of the present invention, after determining that the heat pump unit meets the defrost shutdown conditions, the method further includes:

[0022] Obtain the current device status parameters of the compressor of the heat pump unit; the current device status parameters include at least one of the current device lubrication parameters, current device oxidation parameters, and current device wear parameters;

[0023] Predict the future usage of the heat pump unit; the future usage includes at least one of the following: future usage mode parameters, future usage time parameters, future usage temperature and humidity parameters, and future usage wind direction parameters.

[0024] Based on the current component status parameters of the compressor and the future usage, the future component status parameters of the compressor are predicted; the future component status parameters include at least one of the following: future component lubrication parameters, future component oxidation degree parameters, and future component wear degree parameters.

[0025] Based on the future component status parameters of the compressor, predict the impact on the use of the heat pump unit, and determine the degree of impact parameters corresponding to the impact on the use.

[0026] Determine whether the affected degree parameter is greater than or equal to a preset affected degree threshold. If so, trigger the execution of the defrost exit operation of the heat pump unit, and after the defrost exit operation is completed, control the heat pump unit to perform an oil return operation.

[0027] As an optional implementation, in the first aspect of the present invention, after determining that the heat pump unit meets the oil return time condition, the method further includes:

[0028] Obtain the current exhaust temperature parameter of the heat pump unit, and determine whether the current exhaust temperature parameter is less than the preset exhaust temperature requirement parameter;

[0029] When it is determined that the current exhaust temperature parameter is less than the exhaust temperature requirement parameter, the temperature difference between the current exhaust temperature parameter and the exhaust temperature requirement parameter is calculated, and based on the temperature difference, the waste heat parameter required for the heat pump unit to be in defrost operation is predicted.

[0030] Based on the waste heat parameters, the defrosting extension requirement parameters of the heat pump unit are determined, and based on the defrosting extension requirement parameters, the heat pump unit is controlled to perform the defrosting extension operation; the defrosting extension requirement parameters include defrosting extension time requirement parameters and defrosting extension temperature requirement parameters.

[0031] After the defrosting extension operation is completed, the heat pump unit is controlled to perform a defrosting exit operation, and after the defrosting exit operation is completed, the heat pump unit is controlled to perform an oil return operation.

[0032] As an optional implementation, in the first aspect of the present invention, the method further includes:

[0033] During the process of controlling the heat pump unit to perform the oil return operation, the current condensing temperature parameter of the heat pump unit is obtained, and it is determined whether the current condensing temperature parameter is within the preset condensing temperature range.

[0034] When it is determined that the current condensing temperature parameter is less than the lower limit threshold of the condensing temperature range, the current oil return frequency parameter of the heat pump unit is adjusted to the preset first optimized frequency parameter, and at the same time, the opening of the electronic expansion valve of the heat pump unit is increased to increase the oil return flow rate parameter of the heat pump unit.

[0035] When it is determined that the current condensing temperature parameter is greater than the lower limit threshold of the condensing temperature range, the current oil return frequency parameter of the heat pump unit is adjusted to the preset second optimized frequency parameter, and at the same time, the opening of the electronic expansion valve of the heat pump unit is reduced to reduce the load parameter of the heat pump unit.

[0036] A second aspect of this invention discloses an adaptive defrosting and oil return coordinated control device for a heat pump unit, the device comprising:

[0037] The acquisition module is used to acquire the current outdoor heat exchanger coil temperature parameters of the heat pump unit when the heat pump unit is in defrosting operation.

[0038] The judgment module is used to determine whether the heat pump unit meets the preset defrost exit conditions based on the current outdoor heat exchanger coil temperature parameters.

[0039] The acquisition module is further configured to acquire the target operating parameters of the compressor of the heat pump unit when the judgment module determines that the heat pump unit meets the defrost exit condition;

[0040] The judgment module is also used to determine whether the heat pump unit meets the preset oil return time condition based on the target operating parameters; the target operating parameters include operating frequency parameters and operating duration parameters;

[0041] The control module is used to control the heat pump unit to perform a defrost exit operation when the judgment module determines that the heat pump unit meets the oil return time condition, and to control the heat pump unit to perform an oil return operation after the defrost exit operation is completed.

[0042] As an optional implementation, in the second aspect of the present invention, the method by which the determining module determines whether the heat pump unit meets the preset defrost exit conditions based on the current outdoor heat exchanger coil temperature parameter specifically includes:

[0043] The system obtains the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, and current defrosting duration parameters of the heat pump unit; the current outdoor heat exchanger coil frosting parameters include at least one of the following: current outdoor heat exchanger coil frosting thickness parameters, current outdoor heat exchanger coil frosting location parameters, and current outdoor heat exchanger coil frosting density parameters.

[0044] Based on the current outdoor heat exchanger coil frosting parameters, the outdoor environmental parameters, and the current outdoor heat exchanger coil temperature parameters, predict the defrosting time requirement parameters for the heat pump unit, and determine whether the current defrosting time parameter is greater than or equal to the defrosting time requirement parameters.

[0045] When it is determined that the current defrosting duration parameter is greater than or equal to the defrosting duration requirement parameter, the heat pump unit is determined to meet the preset defrosting exit condition.

[0046] As an optional implementation, in a second aspect of the present invention, the method by which the determining module predicts the defrosting time requirement parameter of the heat pump unit based on the current outdoor heat exchanger coil frosting parameter, the outdoor environmental parameter, and the current outdoor heat exchanger coil temperature parameter specifically includes:

[0047] Obtain the refrigerant flow parameters corresponding to the current outdoor heat exchanger of the heat pump unit; the refrigerant flow parameters include at least one of the following: refrigerant flow temperature parameters, refrigerant flow velocity parameters, refrigerant flow state parameters, and refrigerant flow cross-sectional parameters.

[0048] Based on the current outdoor heat exchanger coil frosting parameters, the outdoor environmental parameters, the current outdoor heat exchanger coil temperature parameters, and the refrigerant flow parameters, predict the outdoor heat exchanger defrosting rate parameters of the heat pump unit.

[0049] Based on the current outdoor heat exchanger coil frosting parameters and the outdoor heat exchanger defrosting rate parameters, the defrosting time requirement parameters of the heat pump unit are predicted.

[0050] As an optional implementation, in the second aspect of the present invention, the method by which the determining module determines whether the heat pump unit meets the preset oil return time condition based on the target operating parameters specifically includes:

[0051] Based on the operating frequency parameters, target operating frequency parameters that are less than or equal to the preset oil return activation frequency threshold are selected from the operating frequency parameters.

[0052] Based on the target operating frequency parameter and the operating time parameter, determine the cumulative operating time parameter corresponding to the target operating frequency parameter, and determine whether the cumulative operating time parameter is greater than or equal to a preset cumulative operating time threshold.

[0053] When it is determined that the cumulative running time parameter is greater than or equal to the cumulative running time threshold, the heat pump unit is determined to meet the preset oil return time condition.

[0054] As an optional implementation, in a second aspect of the invention, the acquisition module is further configured to:

[0055] After the judgment module determines that the heat pump unit meets the defrost exit condition, it obtains the current device status parameters of the compressor of the heat pump unit; the current device status parameters include at least one of the current device lubrication parameters, current device oxidation degree parameters, and current device wear degree parameters;

[0056] The device further includes:

[0057] The first prediction module is used to predict the future usage of the heat pump unit; the future usage includes at least one of future usage mode parameters, future usage time parameters, future usage temperature and humidity parameters, and future usage wind direction parameters; based on the current component status parameters of the compressor and the future usage, it predicts the future component status parameters of the compressor; the future component status parameters include at least one of future component lubrication parameters, future component oxidation degree parameters, and future component wear degree parameters; based on the future component status parameters of the compressor, it predicts the impact on the use of the heat pump unit;

[0058] The first determining module is used to determine the degree of impact parameter corresponding to the affected usage situation;

[0059] The judgment module is also used to determine whether the affected degree parameter is greater than or equal to a preset affected degree threshold. If so, the control module is triggered to execute the defrost exit operation of the heat pump unit, and after the defrost exit operation is completed, the heat pump unit is controlled to perform an oil return operation.

[0060] As an optional implementation, in a second aspect of the invention, the acquisition module is further configured to:

[0061] After determining that the heat pump unit meets the oil return time condition, the current exhaust temperature parameter of the heat pump unit is obtained;

[0062] The judgment module is also used to determine whether the current exhaust temperature parameter is less than the preset exhaust temperature requirement parameter.

[0063] The device further includes:

[0064] The calculation module is used to calculate the temperature difference between the current exhaust temperature parameter and the exhaust temperature requirement parameter when the judgment module determines that the current exhaust temperature parameter is less than the exhaust temperature requirement parameter.

[0065] The second prediction module is used to predict the waste heat parameters required for the heat pump unit to be in defrost operation state based on the temperature difference.

[0066] The second determining module is used to determine the defrosting extension requirement parameters of the heat pump unit based on the waste heat parameters.

[0067] The control module is further configured to control the heat pump unit to perform a defrost extension operation according to the defrost extension requirement parameters; the defrost extension requirement parameters include defrost extension time requirement parameters and defrost extension temperature requirement parameters; after the defrost extension operation is completed, the control module controls the heat pump unit to perform a defrost exit operation, and after the defrost exit operation is completed, the control module controls the heat pump unit to perform an oil return operation.

[0068] As an optional implementation, in a second aspect of the invention, the acquisition module is further configured to:

[0069] During the process of the control module controlling the heat pump unit to perform the oil return operation, the current condensing temperature parameter of the heat pump unit is acquired;

[0070] The judgment module is also used to determine whether the current condensing temperature parameter is within the preset condensing temperature range;

[0071] The control module is further configured to, when the judgment module determines that the current condensing temperature parameter is less than the lower limit threshold of the condensing temperature range, adjust the current oil return frequency parameter of the heat pump unit to a preset first optimized frequency parameter, and simultaneously increase the opening of the electronic expansion valve of the heat pump unit to increase the oil return flow rate parameter of the heat pump unit; when the judgment module determines that the current condensing temperature parameter is greater than the lower limit threshold of the condensing temperature range, adjust the current oil return frequency parameter of the heat pump unit to a preset second optimized frequency parameter, and simultaneously decrease the opening of the electronic expansion valve of the heat pump unit to reduce the load parameter of the heat pump unit.

[0072] A third aspect of the present invention discloses another adaptive defrosting and oil return coordinated control device for heat pump units, the device comprising:

[0073] Memory containing executable program code;

[0074] A processor coupled to the memory;

[0075] The processor calls the executable program code stored in the memory to execute the adaptive defrosting and oil return coordinated control method for heat pump units disclosed in the first aspect of the present invention.

[0076] The fourth aspect of the present invention discloses a computer storage medium storing computer instructions, which, when invoked, are used to execute the adaptive defrosting and oil return coordinated control method for the heat pump unit disclosed in the first aspect of the present invention.

[0077] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0078] In this embodiment of the invention, the current outdoor heat exchanger coil temperature parameter of the heat pump unit in defrost operation is obtained, and based on the current outdoor heat exchanger coil temperature parameter, it is determined whether the heat pump unit meets the defrost exit condition. If so, the target operating parameter of the heat pump unit's compressor is obtained, and based on the target operating parameter, it is determined whether the heat pump unit meets the oil return time condition. If so, the heat pump unit is controlled to perform a defrost exit operation, and after completion, the heat pump unit is controlled to perform an oil return operation. It is evident that implementing this invention enables adaptive defrosting and oil return coordinated control of the heat pump unit, reducing unnecessary operating condition switching times, allowing the unit to operate continuously, reducing indoor temperature fluctuations, and improving oil and gas recovery efficiency, thereby improving the operating energy efficiency and reliability of the heat pump unit. Attached Figure Description

[0079] 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.

[0080] Figure 1 This is a schematic flowchart of an adaptive defrosting and oil return coordinated control method for a heat pump unit disclosed in an embodiment of the present invention;

[0081] Figure 2 This is a schematic flowchart of another adaptive defrosting and oil return coordinated control method for a heat pump unit disclosed in an embodiment of the present invention;

[0082] Figure 3 This is a schematic diagram of the structure of an adaptive defrosting and oil return coordinated control device for a heat pump unit disclosed in an embodiment of the present invention;

[0083] Figure 4 This is a schematic diagram of the structure of another adaptive defrosting and oil return coordinated control device for a heat pump unit disclosed in an embodiment of the present invention;

[0084] Figure 5 This is a schematic diagram of the structure of another adaptive defrosting and oil return coordinated control device for a heat pump unit disclosed in an embodiment of the present invention. Detailed Implementation

[0085] 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 are within the scope of protection of the present invention.

[0086] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0087] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0088] This invention discloses an adaptive defrosting and oil return coordinated control method, device and computer storage medium for heat pump units, which reduces the number of unnecessary operating condition switching of heat pump units, enabling the units to operate continuously, reducing indoor temperature fluctuations and improving oil and gas recovery efficiency, thereby improving the operating energy efficiency and reliability of heat pump units.

[0089] Example 1

[0090] Please see Figure 1 , Figure 1 This is a schematic flowchart illustrating an adaptive defrosting and oil return coordinated control method for a heat pump unit disclosed in an embodiment of the present invention. Figure 1 The described adaptive defrosting and oil return coordinated control method for heat pump units can be applied to air conditioners or other various types of civilian and commercial equipment requiring temperature control, humidity regulation, or heat recovery functions; this invention does not impose limitations. Optionally, this method can be implemented by a coordinated control device, which can be integrated into air conditioners or other various types of civilian and commercial equipment requiring temperature control, humidity regulation, or heat recovery functions. It can also be a local server or cloud server used to process the adaptive defrosting and oil return coordinated control process of the heat pump unit; this invention does not impose limitations. Figure 1 As shown, the adaptive defrosting and oil return coordinated control method of this heat pump unit may include the following operations:

[0091] 101. When the heat pump unit is in defrosting operation, obtain the current outdoor heat exchanger coil temperature parameters of the heat pump unit, and determine whether the heat pump unit meets the preset defrosting exit conditions based on the current outdoor heat exchanger coil temperature parameters.

[0092] In this embodiment of the invention, further, determining whether the heat pump unit meets the preset defrost exit conditions based on the current outdoor heat exchanger coil temperature parameters includes:

[0093] Obtain the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, and current defrosting duration parameters of the heat pump unit;

[0094] Based on the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, and current outdoor heat exchanger coil temperature parameters, predict the defrosting time requirement parameters for the heat pump unit, and determine whether the current defrosting time parameter is greater than or equal to the defrosting time requirement parameter.

[0095] When it is determined that the current defrosting duration parameter is greater than or equal to the defrosting duration requirement parameter, the heat pump unit is deemed to meet the preset defrosting exit conditions.

[0096] In this embodiment of the invention, optionally, the current outdoor heat exchanger coil frosting parameters include at least one of the current outdoor heat exchanger coil frosting thickness parameters, the current outdoor heat exchanger coil frosting location parameters, and the current outdoor heat exchanger coil frosting density parameters.

[0097] Furthermore, based on the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, and current outdoor heat exchanger coil temperature parameters, the defrosting time requirements for the heat pump unit are predicted, including:

[0098] Obtain the refrigerant flow parameters corresponding to the current outdoor heat exchanger of the heat pump unit;

[0099] Based on the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, current outdoor heat exchanger coil temperature parameters, and refrigerant flow parameters, predict the outdoor heat exchanger defrosting rate parameters of the heat pump unit.

[0100] Based on the current outdoor heat exchanger coil frosting parameters and outdoor heat exchanger defrosting rate parameters, predict the defrosting time requirements of the heat pump unit.

[0101] In this optional embodiment, the refrigerant flow parameters may include at least one of the following: refrigerant flow temperature parameters, refrigerant flow velocity parameters, refrigerant flow state parameters, and refrigerant flow cross-sectional parameters.

[0102] For example, if a heat pump unit is operating in heating mode during winter, and the outdoor ambient temperature is -5℃, its controller detects that the outdoor heat exchanger coil temperature is Tdef=-12℃, determining that the defrosting entry conditions are met, and the unit immediately enters defrosting mode. After defrosting is initiated, the controller first obtains the current frost parameters of the outdoor heat exchanger coil. It can calculate the frost thickness to be approximately 3mm and the frost covering 80% of the windward side of the coil by using the temperature difference between the coil and the ambient temperature and combining historical data. At the same time, it collects the refrigerant flow parameters: the refrigerant flow temperature is 55℃, the flow velocity is 0.8m / s, and it is in a high-temperature, high-pressure gaseous state.

[0103] Subsequently, based on the current frosting parameters of the outdoor heat exchanger coils, the controller predicts a defrosting rate of approximately 0.5 mm / min using a preset algorithm. Combined with a frost thickness of 3 mm, the required defrosting time is calculated to be 6 minutes. When the unit has been defrosting for 6 minutes, the controller determines that the current defrosting time is greater than or equal to the required defrosting time, confirming that the defrosting exit condition is met. The controller then exits the defrosting mode and resumes heating operation.

[0104] 102. When it is determined that the heat pump unit meets the defrost exit conditions, the target operating parameters of the heat pump unit's compressor are obtained, and based on the target operating parameters, it is determined whether the heat pump unit meets the preset oil return time conditions.

[0105] In this embodiment of the invention, the target operating parameters include operating frequency parameters and operating duration parameters.

[0106] Furthermore, based on the target operating parameters, it is determined whether the heat pump unit meets the preset oil return time conditions, including:

[0107] Based on the operating frequency parameters, select target operating frequency parameters that are less than or equal to the preset oil return activation frequency threshold.

[0108] Based on the target operating frequency parameter and the operating time parameter, determine the cumulative operating time parameter corresponding to the target operating frequency parameter, and determine whether the cumulative operating time parameter is greater than or equal to the preset cumulative operating time threshold.

[0109] When the cumulative running time parameter is determined to be greater than or equal to the cumulative running time threshold, the heat pump unit is determined to meet the preset oil return time condition.

[0110] In this optional embodiment, the cumulative running time threshold can be predetermined based on the historical operating status of the heat pump unit, such as historical operating mode, historical operating temperature and humidity, historical running time, etc., and in combination with the oil return parameters of the heat pump unit, such as oil return type parameters, oil return quantity parameters, oil return impurity parameters, oil return viscosity parameters, etc.

[0111] 103. When it is determined that the heat pump unit meets the oil return time condition, control the heat pump unit to perform the defrost exit operation, and after the defrost exit operation is completed, control the heat pump unit to perform the oil return operation.

[0112] It is evident that implementing the embodiments of the present invention can effectively solve the problems of insufficient accuracy, lack of timeliness, and low efficiency caused by the independent operation of defrosting and oil return in traditional units by constructing a collaborative control logic for defrosting and oil return in heat pump units. In the defrosting process, the defrosting time requirement is dynamically predicted by combining the outdoor heat exchanger coil frost parameters, outdoor environmental parameters, and refrigerant flow parameters. This accurately matches the defrosting progress with the defrosting operation, reducing problems such as incomplete defrosting and subsequent heat exchange efficiency reduction caused by premature termination of defrosting, and preventing energy waste caused by premature termination. In the oil return process, the oil return requirement is judged based on the cumulative duration of low-frequency compressor operation. Oil return can be started directly after defrosting without waiting for the oil return timer to trigger a second time (most existing technologies return to heating mode immediately after defrosting and wait for the timer to finish calculating before triggering the oil return process). This reduces the risk of insufficient compressor lubrication and component wear caused by long-term lubricating oil retention in the system. It also reduces the number of unit mode switching, reduces energy loss and equipment wear caused by frequent start-stop, and significantly improves the operational reliability, energy efficiency, and service life of the heat pump unit in scenarios requiring frequent defrosting, such as low temperatures in winter.

[0113] In an optional embodiment, after determining that the heat pump unit meets the defrost shutdown conditions, the method further includes:

[0114] Obtain the current device status parameters of the compressor in the heat pump unit;

[0115] Predicting the future usage of heat pump units;

[0116] Based on the current component status parameters of the compressor and its future usage, predict the future component status parameters of the compressor;

[0117] Based on the future component status parameters of the compressor, predict the impact on the use of the heat pump unit and determine the degree of impact parameters corresponding to the impact on the use;

[0118] Determine whether the affected level parameter is greater than or equal to the preset affected level threshold. If so, trigger the execution of the defrost exit operation of the heat pump unit and, after the defrost exit operation is completed, control the heat pump unit to perform the oil return operation.

[0119] In this optional embodiment, the compressor device status assessment process of the heat pump unit can be performed after determining in step 102 that the heat pump unit meets the defrost exit condition, or after determining in step 103 that the heat pump unit meets the oil return time condition. This embodiment does not limit the process.

[0120] Optionally, the current device status parameters include at least one of the following: current device lubrication parameters, current device oxidation degree parameters, and current device wear degree parameters; and the future usage conditions include at least one of the following: future usage mode parameters, future usage time parameters, future usage temperature and humidity parameters, and future usage airflow direction parameters. Further optionally, the future device status parameters include at least one of the following: future device lubrication parameters, future device oxidation degree parameters, and future device wear degree parameters; and the usage impact conditions include whether the heating effect or cooling effect is affected.

[0121] For example, after a heat pump unit completes defrosting, the controller initiates a compressor component status assessment process. First, it obtains the current component status parameters: the built-in sensor detects a lubrication level of 65 (out of 100, below 70 requires attention), a slight oxidation level (oxidation value 0.2), and a normal wear level (wear coefficient 0.15). Next, combining weather forecasts and user habits, it predicts future usage: heating mode for the next 24 hours (usage mode parameter), continuous operation for 18 hours (usage time parameter), and outdoor temperature and humidity of -8℃ / 60%RH (usage temperature and humidity parameter). Then, the controller uses an algorithm to predict future component status: due to prolonged heating at low temperatures, the lubrication level will drop to 58, the oxidation level will rise to moderate, and the wear coefficient will increase to 0.22. Further assessment of the impact on usage is made: heating efficiency may decrease by 15%, with an impact level parameter of 75 (preset threshold 60). Since 75≥60, the controller triggers the defrost exit operation. After exiting, it immediately starts the oil return. By increasing the oil return frequency and EEV opening, it replenishes the compressor lubricating oil and reduces the wear and tear on components caused by insufficient lubrication during subsequent heating.

[0122] As can be seen, this optional embodiment, after the heat pump unit meets the defrost exit conditions, effectively solves the problem of traditional control methods that rely solely on time or temperature to trigger oil return, easily overlooking the compatibility between component status and subsequent operating conditions. By acquiring current compressor lubrication and oxidation levels, and combining this with future usage patterns, temperature, and humidity conditions to predict future component status, the extent of impact on usage can be determined. This allows for accurate identification of the risk of reduced heating / cooling performance due to poor component status under subsequent operating conditions. Furthermore, triggering defrost exit and oil return only when the impact reaches a threshold reduces energy waste caused by premature oil return and prevents accelerated component wear under subsequent high-load conditions due to delayed oil return. This significantly improves the targeting and timeliness of the heat pump unit's oil return operation, thereby ensuring long-term stable operation and performance reliability of the unit under complex operating conditions.

[0123] In another alternative embodiment, the method further includes:

[0124] During the process of controlling the heat pump unit to perform oil return operation, the current condensing temperature parameter of the heat pump unit is obtained, and it is determined whether the current condensing temperature parameter is within the preset condensing temperature range.

[0125] When it is determined that the current condensing temperature parameter is less than the lower limit threshold of the condensing temperature range, the current oil return frequency parameter of the heat pump unit is adjusted to the preset first optimized frequency parameter, and the opening of the electronic expansion valve of the heat pump unit is increased to increase the oil return flow rate parameter of the heat pump unit.

[0126] When it is determined that the current condensing temperature parameter is greater than the lower limit threshold of the condensing temperature range, the current oil return frequency parameter of the heat pump unit is adjusted to the preset second optimized frequency parameter. At the same time, the opening of the electronic expansion valve of the heat pump unit is reduced to reduce the load parameter of the heat pump unit.

[0127] In this optional embodiment, both the first optimized frequency parameter and the second optimized frequency parameter can be determined in the following way:

[0128] Obtain the rated circulation flow rate parameters of the refrigerant used in the heat pump unit and the rated operating frequency parameters of the compressor of the heat pump unit. Based on the rated circulation flow rate parameters of the refrigerant, determine the operating frequency parameters of the compressor's driving lubricating oil. The rated operating frequency parameters include the rated minimum operating frequency parameters and the rated maximum operating frequency parameters.

[0129] The first optimized frequency parameter is determined based on the rated minimum operating frequency parameter and the operating frequency parameter of the lubricating oil, and the second optimized frequency parameter is determined based on the rated maximum operating frequency parameter and the operating frequency parameter of the lubricating oil.

[0130] Specifically, the rated operating frequency parameters of the compressor are the standard minimum operating frequency parameters and standard maximum operating frequency parameters specified by the manufacturer when the heat pump unit's compressor leaves the factory, and the first optimized frequency parameter is less than the second optimized frequency parameter. Furthermore, it should be noted that in actual engineering, the determination of the operating frequency parameter driving the lubricating oil is usually based on the rated refrigerant circulation flow rate: when the compressor operating frequency reaches a certain value, the refrigerant circulation flow rate can just meet the minimum requirement for lubricating oil to return to the compressor; this frequency is the operating frequency driving the lubricating oil (which can be determined experimentally). When the compressor frequency is lower than this operating frequency driving the lubricating oil, the refrigerant flow rate is insufficient, and the lubricating oil easily stagnates in components such as heat exchangers, leading to difficulties in oil return; when the frequency is too high, the refrigerant flow rate increases sharply, enhancing the ability to carry lubricating oil, but excessively high frequencies increase energy consumption and system load. In this way, by setting the first and second optimized frequency parameters based on the rated circulation flow parameters of the refrigerant used in the heat pump unit and the rated operating frequency parameters of the compressor of the heat pump unit, it is possible to ensure that the increase in the current oil return frequency of the heat pump unit will not affect the normal and stable operation of the compressor of the heat pump unit while ensuring normal oil return, thereby reducing the overload operation of the heat pump unit.

[0131] As can be seen, this optional embodiment effectively solves the problem of the fixed frequency and electronic expansion valve opening being difficult to adapt to operating condition fluctuations in traditional oil return operations by introducing dynamic adaptation logic between condensing temperature and oil return parameters during the oil return process. When the condensing temperature is low, increasing the oil return frequency and valve opening accelerates the lubricating oil flow rate, reducing the occurrence of lubricating oil stagnation in the pipeline due to slow refrigerant circulation. When the condensing temperature is high, reducing the oil return frequency and valve opening controls the unit load, preventing the compressor from overloading due to high temperature and high pressure, further ensuring the safety and stability of the oil return operation. This improves oil return efficiency, extends compressor life, and reduces energy waste and equipment failures caused by operating condition fluctuations, significantly enhancing the oil return reliability and overall operating efficiency of the heat pump unit in complex operating environments.

[0132] Example 2

[0133] Please see Figure 2 , Figure 2 This is a schematic flowchart of another adaptive defrosting and oil return coordinated control method for heat pump units disclosed in an embodiment of the present invention. Figure 2The described adaptive defrosting and oil return coordinated control method for heat pump units can be applied to air conditioners or other various types of civilian and commercial equipment requiring temperature control, humidity regulation, or heat recovery functions; this invention does not impose limitations. Optionally, this method can be implemented by a coordinated control device, which can be integrated into air conditioners or other various types of civilian and commercial equipment requiring temperature control, humidity regulation, or heat recovery functions. It can also be a local server or cloud server used to process the adaptive defrosting and oil return coordinated control process of the heat pump unit; this invention does not impose limitations. Figure 2 As shown, the adaptive defrosting and oil return coordinated control method of this heat pump unit may include the following operations:

[0134] 201. When the heat pump unit is in defrosting operation, obtain the current outdoor heat exchanger coil temperature parameters of the heat pump unit, and determine whether the heat pump unit meets the preset defrosting exit conditions based on the current outdoor heat exchanger coil temperature parameters.

[0135] 202. When it is determined that the heat pump unit meets the defrost exit conditions, the target operating parameters of the heat pump unit's compressor are obtained, and based on the target operating parameters, it is determined whether the heat pump unit meets the preset oil return time conditions.

[0136] 203. When it is determined that the heat pump unit meets the oil return time condition, obtain the current exhaust temperature parameter of the heat pump unit and determine whether the current exhaust temperature parameter is less than the preset exhaust temperature requirement parameter.

[0137] 204. When it is determined that the current exhaust temperature parameter is less than the exhaust temperature requirement parameter, calculate the temperature difference between the current exhaust temperature parameter and the exhaust temperature requirement parameter, and predict the waste heat parameter required for the heat pump unit to be in defrost operation state based on the temperature difference.

[0138] 205. Based on the waste heat parameters, determine the defrosting extension requirement parameters for the heat pump unit, and control the heat pump unit to perform the defrosting extension operation according to the defrosting extension requirement parameters.

[0139] In this embodiment of the invention, the defrosting extension requirement parameters include defrosting extension time requirement parameters and defrosting extension temperature requirement parameters.

[0140] 206. After the defrosting extension operation is completed, control the heat pump unit to perform the defrosting exit operation, and after the defrosting exit operation is completed, control the heat pump unit to perform the oil return operation.

[0141] In this embodiment of the invention, further, based on the temperature difference, the waste heat parameters required for the heat pump unit to operate in defrost mode are predicted, including:

[0142] Based on the defrosting operating parameters corresponding to the heat pump unit in defrosting operation, determine the equivalent heat capacity parameters corresponding to the heat pump unit in defrosting operation.

[0143] Based on the outdoor ambient temperature parameters of the heat pump unit and the current outdoor heat exchanger coil temperature parameters of the heat pump unit, the heat loss compensation coefficient of the heat pump unit is determined. Based on the temperature difference, equivalent heat capacity parameters, and heat loss compensation coefficient, the waste heat parameters required for the heat pump unit to be in defrost operation are calculated.

[0144] Specifically, the waste heat parameter Q required for the heat pump unit to operate in defrost mode is calculated using the following formula: Q = △T * C * k;

[0145] Where C is the equivalent heat capacity parameter, the unit of which can be kJ / ℃, and it can be understood as the total heat absorbed by the entire heat pump unit for every 1℃ increase in exhaust temperature during defrosting; k is the heat loss compensation coefficient, which can be calculated by a trained heat loss compensation calculation model.

[0146] Furthermore, based on waste heat parameters, the defrosting extension requirements for the heat pump unit are determined, including:

[0147] Based on the defrosting operating parameters corresponding to the defrosting operation of the heat pump unit, determine the effective heat production rate of the compressor per unit time of the heat pump unit, and based on the waste heat parameters and the effective heat production rate of the compressor per unit time, determine the defrosting extension time requirement parameters of the heat pump unit.

[0148] Obtain the safe oil return temperature range of the heat pump system, and determine the defrost extension temperature requirement parameters of the heat pump unit based on the safe oil return temperature range.

[0149] In an embodiment of the invention, for example, a heat pump unit triggers defrost mode when the outdoor temperature is -6°C and the outdoor heat exchanger coil temperature is Tdef = -13°C. After 5 minutes of defrost operation, Tdef rises to 6°C, satisfying the defrost exit condition of "Tdef > 5°C for 60 seconds". Subsequently, its controller obtains the compressor's target operating parameters: in the past 1.5 hours, the compressor has accumulated 92 minutes of operation at 32 rpm (≤ oil return activation frequency threshold 35 rpm), which is ≥ the accumulated operating time threshold of 60 minutes, thus determining that the oil return time condition is met. Next, the exhaust temperature of the heat pump unit was collected (Td = 92℃), while the preset exhaust temperature requirement for oil return was 105℃. It was determined that Td < 105℃, and the temperature difference was calculated to be 13℃. Then, the equivalent heat capacity parameter C, determined by the defrosting conditions, was 2.5 kJ / ℃ (the correspondence between these parameters can be calibrated experimentally before delivery). Based on the heat loss compensation calculation model, k was calculated to be 1.2, based on the temperature difference between the outdoor ambient temperature parameter and the current outdoor heat exchanger coil temperature parameter of the heat pump unit. Then, using Q = △T * C * k, the waste heat parameter corresponding to the required 13℃ was calculated to be 39 kJ. Furthermore, the effective heat production rate f of the compressor per unit time, determined by the defrosting conditions, was 1.5 kJ / min (the correspondence between these parameters can be calibrated experimentally before delivery). Therefore, the required defrosting extension time parameter was determined to be 26 minutes (T = Q / f). Finally, based on the safe oil return temperature range of the heat pump system (e.g., T... safe The temperature range is 105~110℃, where the lower limit of 105℃ is the optimal return temperature of the lubricating oil, and the upper limit of 110℃ is the safe discharge threshold of the compressor (which can be calibrated experimentally before leaving the factory). The required extended defrost temperature parameter is then determined to be Ta=105℃. The controller then controls the unit to continue defrosting for 26 minutes, maintaining the compressor defrost frequency and increasing the opening of the electronic expansion valve, causing Td to gradually rise to Ta. After the extended defrost operation is completed, the unit exits the defrost mode and immediately starts the oil return operation. Through a certain oil return frequency and an adapted opening of the electronic expansion valve, the efficient return of lubricating oil to the compressor is ensured.

[0150] In this embodiment of the invention, for other descriptions of steps 201-202, please refer to the detailed description of steps 101-102 in Embodiment 1. This embodiment of the invention will not repeat them.

[0151] As can be seen, implementing the embodiments of the present invention can effectively solve the problem of insufficient lubricating oil flow and low oil return efficiency caused by direct oil return after defrosting in traditional control by introducing exhaust temperature prediction and defrosting extension adaptation logic in the coordinated control of defrosting and oil return. After confirming that the defrosting exit and oil return time conditions are met, it is first determined whether the exhaust temperature meets the oil return requirements. If the temperature is insufficient, the required waste heat parameters are predicted by calculating the temperature difference, and then the defrosting extension time and temperature target are determined, extending the defrosting process to utilize waste heat to increase the exhaust temperature. This design reduces the risk of lubricating oil stagnation in the pipeline and aggravated compressor wear due to low exhaust temperature, and eliminates the need to start the heating device to consume energy, making full use of the waste heat resources in the defrosting stage. At the same time, the adaptation parameters of the compressor and electronic expansion valve are maintained during the defrosting extension process to ensure stable waste heat generation. Defrosting exit and oil return are then executed after the temperature reaches the target, significantly improving the effectiveness of oil return operation and unit operating energy efficiency, and ensuring the reliability and long-term stable operation of the heat pump unit in low-temperature environments.

[0152] Example 3

[0153] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of an adaptive defrosting and oil return coordinated control device for a heat pump unit disclosed in an embodiment of the present invention. Figure 3 As shown, the adaptive defrosting and oil return coordinated control device of the heat pump unit may include:

[0154] The acquisition module 301 is used to acquire the current outdoor heat exchanger coil temperature parameters of the heat pump unit when the heat pump unit is in defrosting operation.

[0155] The judgment module 302 is used to determine whether the heat pump unit meets the preset defrost exit conditions based on the current outdoor heat exchanger coil temperature parameters.

[0156] The acquisition module 301 is also used to acquire the target operating parameters of the compressor of the heat pump unit when the judgment module 302 determines that the heat pump unit meets the defrost exit conditions;

[0157] The judgment module 302 is also used to determine whether the heat pump unit meets the preset oil return time condition based on the target operating parameters;

[0158] The control module 303 is used to control the heat pump unit to perform a defrost exit operation when the judgment module 302 determines that the heat pump unit meets the oil return time condition, and to control the heat pump unit to perform an oil return operation after the defrost exit operation is completed.

[0159] In this embodiment of the invention, the target operating parameters include operating frequency parameters and operating duration parameters.

[0160] Furthermore, the judgment module 302 determines whether the heat pump unit meets the preset defrost exit conditions based on the current outdoor heat exchanger coil temperature parameters, specifically including the following methods:

[0161] Obtain the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, and current defrosting duration parameters of the heat pump unit;

[0162] Based on the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, and current outdoor heat exchanger coil temperature parameters, predict the defrosting time requirement parameters for the heat pump unit, and determine whether the current defrosting time parameter is greater than or equal to the defrosting time requirement parameter.

[0163] When it is determined that the current defrosting duration parameter is greater than or equal to the defrosting duration requirement parameter, the heat pump unit is deemed to meet the preset defrosting exit conditions.

[0164] In this optional embodiment, the current outdoor heat exchanger coil frosting parameters include at least one of the following: current outdoor heat exchanger coil frosting thickness parameters, current outdoor heat exchanger coil frosting location parameters, and current outdoor heat exchanger coil frosting density parameters.

[0165] Furthermore, the judgment module 302 predicts the defrosting time requirement parameters of the heat pump unit based on the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, and current outdoor heat exchanger coil temperature parameters. The specific methods include:

[0166] Obtain the refrigerant flow parameters corresponding to the current outdoor heat exchanger of the heat pump unit;

[0167] Based on the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, current outdoor heat exchanger coil temperature parameters, and refrigerant flow parameters, predict the outdoor heat exchanger defrosting rate parameters of the heat pump unit.

[0168] Based on the current outdoor heat exchanger coil frosting parameters and outdoor heat exchanger defrosting rate parameters, predict the defrosting time requirements of the heat pump unit.

[0169] In this optional embodiment, the refrigerant flow parameters include at least one of the following: refrigerant flow temperature parameters, refrigerant flow velocity parameters, refrigerant flow state parameters, and refrigerant flow cross-sectional parameters.

[0170] Furthermore, the judgment module 302 determines whether the heat pump unit meets the preset oil return time condition based on the target operating parameters in the following ways:

[0171] Based on the operating frequency parameters, select target operating frequency parameters that are less than or equal to the preset oil return activation frequency threshold.

[0172] Based on the target operating frequency parameter and the operating time parameter, determine the cumulative operating time parameter corresponding to the target operating frequency parameter, and determine whether the cumulative operating time parameter is greater than or equal to the preset cumulative operating time threshold.

[0173] When the cumulative running time parameter is determined to be greater than or equal to the cumulative running time threshold, the heat pump unit is determined to meet the preset oil return time condition.

[0174] It is evident that implementation Figure 3 The adaptive defrosting and oil return coordinated control device for the heat pump unit described herein can effectively solve the problems of insufficient accuracy, lack of timeliness and low efficiency caused by the independent operation of defrosting and oil return in traditional units by constructing a coordinated control logic for defrosting and oil return of the heat pump unit. In the defrosting process, the defrosting time requirement is dynamically predicted by combining the outdoor heat exchanger coil frost parameters, outdoor environmental parameters, and refrigerant flow parameters. This accurately matches the defrosting progress with the defrosting operation, reducing problems such as incomplete defrosting and subsequent heat exchange efficiency reduction caused by premature termination of defrosting, and preventing energy waste caused by premature termination. In the oil return process, the oil return requirement is judged based on the cumulative duration of low-frequency compressor operation. Oil return can be started directly after defrosting without waiting for the oil return timer to trigger a second time (most existing technologies return to heating mode immediately after defrosting and wait for the timer to finish calculating before triggering the oil return process). This reduces the risk of insufficient compressor lubrication and component wear caused by long-term lubricating oil retention in the system. It also reduces the number of unit mode switching, reduces energy loss and equipment wear caused by frequent start-stop, and significantly improves the operational reliability, energy efficiency, and service life of the heat pump unit in scenarios requiring frequent defrosting, such as low temperatures in winter.

[0175] In an optional embodiment, the acquisition module 301 is further configured to:

[0176] After the judgment module 302 determines that the heat pump unit meets the defrost exit conditions, it obtains the current device status parameters of the compressor of the heat pump unit.

[0177] The device also includes:

[0178] The first prediction module 304 is used to predict the future usage of the heat pump unit; predict the future device status parameters of the compressor based on the current device status parameters of the compressor and the future usage; and predict the impact on the usage of the heat pump unit based on the future device status parameters of the compressor.

[0179] The first determining module 305 is used to determine the degree of impact parameter corresponding to the affected situation.

[0180] The judgment module 302 is also used to determine whether the affected degree parameter is greater than or equal to the preset affected degree threshold. If so, it triggers the control module 303 to execute the defrost exit operation of the heat pump unit, and after the defrost exit operation is completed, it controls the heat pump unit to execute the oil return operation.

[0181] In this optional embodiment, the current device status parameters include at least one of the current device lubrication parameters, the current device oxidation degree parameters, and the current device wear degree parameters; the future usage conditions include at least one of the future usage mode parameters, the future usage time parameters, the future usage temperature and humidity parameters, and the future usage wind direction parameters; the future device status parameters include at least one of the future device lubrication parameters, the future device oxidation degree parameters, and the future device wear degree parameters.

[0182] It is evident that implementation Figure 4 The described adaptive defrosting and oil return coordinated control device for heat pump units effectively solves the problem of traditional control methods that rely solely on time or temperature to trigger oil return, neglecting the compatibility between component status and subsequent operating conditions, by introducing a linkage logic that assesses compressor component status and predicts future usage conditions after the heat pump unit meets the defrosting exit conditions. By acquiring current compressor lubrication and oxidation levels, and combining this with predictions of future component status based on usage patterns, temperature, and humidity, the device accurately identifies the risk of reduced heating / cooling performance due to poor component condition under subsequent operating conditions. Furthermore, it triggers defrosting exit and oil return operations only when the impact reaches a threshold, reducing energy waste caused by premature oil return and preventing accelerated component wear under subsequent high-load conditions due to delayed oil return. This significantly improves the targeting and timeliness of the heat pump unit's oil return operation, ensuring long-term stable operation and performance reliability under complex conditions.

[0183] In another alternative embodiment, the acquisition module 301 is further configured to:

[0184] After determining that the heat pump unit meets the oil return time condition, the current exhaust temperature parameter of the heat pump unit is obtained.

[0185] The judgment module 302 is also used to determine whether the current exhaust temperature parameter is less than the preset exhaust temperature requirement parameter;

[0186] The device also includes:

[0187] The calculation module 306 is used to calculate the temperature difference between the current exhaust temperature parameter and the exhaust temperature requirement parameter when the judgment module 302 determines that the current exhaust temperature parameter is less than the exhaust temperature requirement parameter.

[0188] The second prediction module 307 is used to predict the waste heat parameters required for the heat pump unit to be in defrost operation state based on the temperature difference.

[0189] The second determining module 308 is used to determine the defrosting extension requirement parameters of the heat pump unit based on the waste heat parameters.

[0190] The control module 303 is also used to control the heat pump unit to perform a defrost extension operation according to the defrost extension requirement parameters; after the defrost extension operation is completed, control the heat pump unit to perform a defrost exit operation; and after the defrost exit operation is completed, control the heat pump unit to perform an oil return operation.

[0191] In this optional embodiment, the defrosting extension requirement parameters include defrosting extension time requirement parameters and defrosting extension temperature requirement parameters.

[0192] It is evident that implementation Figure 4 The described adaptive defrosting and oil return coordinated control device for heat pump units effectively solves the problem of insufficient lubricating oil flow and low oil return efficiency caused by direct oil return after defrosting in traditional control systems, which introduces exhaust temperature prediction and defrosting extension adaptation logic into the defrosting and oil return coordinated control. After confirming that the defrosting exit and oil return time conditions are met, the system first judges whether the exhaust temperature meets the oil return requirements. If the temperature is insufficient, the required waste heat parameters are predicted by calculating the temperature difference, and then the defrosting extension time and temperature target are determined, extending the defrosting process to utilize waste heat to increase the exhaust temperature. This design reduces the risk of lubricating oil stagnation in pipelines and aggravated compressor wear due to low exhaust temperature, and eliminates the need to start additional heating devices to consume energy, making full use of waste heat resources during the defrosting stage. At the same time, the adaptation parameters of the compressor and electronic expansion valve are maintained during the defrosting extension process to ensure stable waste heat generation. Defrosting exit and oil return are then executed after the temperature reaches the target, significantly improving the effectiveness of oil return operation and unit operating energy efficiency, and ensuring the reliability and long-term stable operation of the heat pump unit in low-temperature environments.

[0193] In yet another optional embodiment, the acquisition module 301 is further configured to:

[0194] During the process of the control module 303 controlling the heat pump unit to perform the oil return operation, the current condensing temperature parameter of the heat pump unit is obtained.

[0195] The judgment module 302 is also used to determine whether the current condensing temperature parameter is within the preset condensing temperature range;

[0196] The control module 303 is further configured to, when the judgment module 302 determines that the current condensing temperature parameter is less than the lower limit threshold of the condensing temperature range, adjust the current oil return frequency parameter of the heat pump unit to a preset first optimized frequency parameter, and simultaneously increase the opening of the electronic expansion valve of the heat pump unit to increase the oil return flow rate parameter of the heat pump unit; when the judgment module 302 determines that the current condensing temperature parameter is greater than the lower limit threshold of the condensing temperature range, adjust the current oil return frequency parameter of the heat pump unit to a preset second optimized frequency parameter, and simultaneously decrease the opening of the electronic expansion valve of the heat pump unit to reduce the load parameter of the heat pump unit.

[0197] It is evident that implementation Figure 4 The described adaptive defrosting and oil return coordinated control device for the heat pump unit effectively solves the problem of the fixed frequency and electronic expansion valve opening being difficult to adapt to operating condition fluctuations in traditional oil return operations by introducing dynamic adaptation logic between condensing temperature and oil return parameters during the oil return process. When the condensing temperature is low, the oil return frequency and valve opening are increased to accelerate the lubricating oil flow rate, reducing the occurrence of lubricating oil stagnation in the pipeline due to slow refrigerant circulation. When the condensing temperature is high, the unit load is controlled by reducing the oil return frequency and valve opening to prevent the compressor from overloading due to high temperature and high pressure, further ensuring the safety and stability of the oil return operation. This improves the oil return efficiency, extends the compressor's service life, and reduces energy waste and equipment failures caused by operating condition fluctuations, significantly enhancing the oil return reliability and overall operating energy efficiency of the heat pump unit in complex operating environments.

[0198] Example 4

[0199] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of another adaptive defrosting and oil return coordinated control device for a heat pump unit disclosed in an embodiment of the present invention. Figure 5 As shown, the adaptive defrosting and oil return coordinated control device of the heat pump unit may include:

[0200] Memory 401 storing executable program code;

[0201] Processor 402 coupled to memory 401;

[0202] The processor 402 calls the executable program code stored in the memory 401 to execute the steps in the adaptive defrosting and oil return coordinated control method of the heat pump unit described in Embodiment 1 or Embodiment 2 of the present invention.

[0203] Example 5

[0204] This invention discloses a computer storage medium storing computer instructions. When these computer instructions are invoked, they are used to execute the steps in the adaptive defrosting and oil return coordinated control method for heat pump units described in Embodiment 1 or Embodiment 2 of this invention.

[0205] Example 6

[0206] This invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to perform the steps in the adaptive defrosting and oil return coordinated control method for heat pump units described in Embodiment 1 or Embodiment 2.

[0207] The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0208] Through the detailed description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, 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 can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0209] Finally, it should be noted that the adaptive defrosting and oil return coordinated control method, device, and computer storage medium for a heat pump unit disclosed in the embodiments of the present invention are merely preferred embodiments of the present invention and are only used to illustrate the technical solutions of the present invention, not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for adaptive defrosting and oil return coordinated control of a heat pump unit, characterized in that, The method includes: When the heat pump unit is in defrosting operation, the current outdoor heat exchanger coil temperature parameter of the heat pump unit is obtained, and based on the current outdoor heat exchanger coil temperature parameter, it is determined whether the heat pump unit meets the preset defrosting exit conditions. When it is determined that the heat pump unit meets the defrost exit condition, the target operating parameters of the compressor of the heat pump unit are obtained, and based on the target operating parameters, it is determined whether the heat pump unit meets the preset oil return time condition; the target operating parameters include operating frequency parameters and operating duration parameters; When it is determined that the heat pump unit meets the oil return time condition, the heat pump unit is controlled to perform a defrost exit operation, and after the defrost exit operation is completed, the heat pump unit is controlled to perform an oil return operation. And, after determining that the heat pump unit meets the defrost shutdown conditions, the method further includes: Obtain the current device status parameters of the compressor of the heat pump unit; the current device status parameters include at least one of the current device lubrication parameters, current device oxidation parameters, and current device wear parameters; Predict the future usage of the heat pump unit; the future usage includes at least one of the following: future usage mode parameters, future usage time parameters, future usage temperature and humidity parameters, and future usage wind direction parameters. Based on the current component status parameters of the compressor and the future usage, the future component status parameters of the compressor are predicted; the future component status parameters include at least one of the following: future component lubrication parameters, future component oxidation degree parameters, and future component wear degree parameters. Based on the future component status parameters of the compressor, predict the impact on the use of the heat pump unit, and determine the degree of impact parameters corresponding to the impact on the use. Determine whether the affected degree parameter is greater than or equal to a preset affected degree threshold. If so, trigger the execution of the defrost exit operation of the heat pump unit, and after the defrost exit operation is completed, control the heat pump unit to perform an oil return operation.

2. The adaptive defrosting and oil return coordinated control method for heat pump units according to claim 1, characterized in that, The step of determining whether the heat pump unit meets the preset defrost shutdown conditions based on the current outdoor heat exchanger coil temperature parameters includes: The system obtains the current outdoor heat exchanger coil frosting parameters, outdoor environmental parameters, and current defrosting duration parameters of the heat pump unit; the current outdoor heat exchanger coil frosting parameters include at least one of the following: current outdoor heat exchanger coil frosting thickness parameters, current outdoor heat exchanger coil frosting location parameters, and current outdoor heat exchanger coil frosting density parameters. Based on the current outdoor heat exchanger coil frosting parameters, the outdoor environmental parameters, and the current outdoor heat exchanger coil temperature parameters, predict the defrosting time requirement parameters for the heat pump unit, and determine whether the current defrosting time parameter is greater than or equal to the defrosting time requirement parameters. When it is determined that the current defrosting duration parameter is greater than or equal to the defrosting duration requirement parameter, the heat pump unit is determined to meet the preset defrosting exit condition.

3. The adaptive defrosting and oil return coordinated control method for heat pump units according to claim 2, characterized in that, The step of predicting the defrosting time requirement parameters of the heat pump unit based on the current outdoor heat exchanger coil frosting parameters, the outdoor environmental parameters, and the current outdoor heat exchanger coil temperature parameters includes: Obtain the refrigerant flow parameters corresponding to the current outdoor heat exchanger of the heat pump unit; the refrigerant flow parameters include at least one of the following: refrigerant flow temperature parameters, refrigerant flow velocity parameters, refrigerant flow state parameters, and refrigerant flow cross-sectional parameters. Based on the current outdoor heat exchanger coil frosting parameters, the outdoor environmental parameters, the current outdoor heat exchanger coil temperature parameters, and the refrigerant flow parameters, predict the outdoor heat exchanger defrosting rate parameters of the heat pump unit. Based on the current outdoor heat exchanger coil frosting parameters and the outdoor heat exchanger defrosting rate parameters, the defrosting time requirement parameters of the heat pump unit are predicted.

4. The adaptive defrosting and oil return coordinated control method for a heat pump unit according to any one of claims 1-3, characterized in that, The step of determining whether the heat pump unit meets the preset oil return time condition based on the target operating parameters includes: Based on the operating frequency parameters, target operating frequency parameters that are less than or equal to the preset oil return activation frequency threshold are selected from the operating frequency parameters. Based on the target operating frequency parameter and the operating time parameter, determine the cumulative operating time parameter corresponding to the target operating frequency parameter, and determine whether the cumulative operating time parameter is greater than or equal to a preset cumulative operating time threshold. When it is determined that the cumulative running time parameter is greater than or equal to the cumulative running time threshold, the heat pump unit is determined to meet the preset oil return time condition.

5. The adaptive defrosting and oil return coordinated control method for a heat pump unit according to any one of claims 1-3, characterized in that, After determining that the heat pump unit meets the oil return time condition, the method further includes: Obtain the current exhaust temperature parameter of the heat pump unit, and determine whether the current exhaust temperature parameter is less than the preset exhaust temperature requirement parameter; When it is determined that the current exhaust temperature parameter is less than the exhaust temperature requirement parameter, the temperature difference between the current exhaust temperature parameter and the exhaust temperature requirement parameter is calculated, and based on the temperature difference, the waste heat parameter required for the heat pump unit to be in defrost operation is predicted. Based on the waste heat parameters, the defrosting extension requirement parameters of the heat pump unit are determined, and based on the defrosting extension requirement parameters, the heat pump unit is controlled to perform the defrosting extension operation; the defrosting extension requirement parameters include defrosting extension time requirement parameters and defrosting extension temperature requirement parameters. After the defrosting extension operation is completed, the heat pump unit is controlled to perform a defrosting exit operation, and after the defrosting exit operation is completed, the heat pump unit is controlled to perform an oil return operation.

6. The adaptive defrosting and oil return coordinated control method for a heat pump unit according to any one of claims 1-3, characterized in that, The method further includes: During the process of controlling the heat pump unit to perform the oil return operation, the current condensing temperature parameter of the heat pump unit is obtained, and it is determined whether the current condensing temperature parameter is within the preset condensing temperature range. When it is determined that the current condensing temperature parameter is less than the lower limit threshold of the condensing temperature range, the current oil return frequency parameter of the heat pump unit is adjusted to the preset first optimized frequency parameter, and at the same time, the opening of the electronic expansion valve of the heat pump unit is increased to increase the oil return flow rate parameter of the heat pump unit. When it is determined that the current condensing temperature parameter is greater than the lower limit threshold of the condensing temperature range, the current oil return frequency parameter of the heat pump unit is adjusted to the preset second optimized frequency parameter, and at the same time, the opening of the electronic expansion valve of the heat pump unit is reduced to reduce the load parameter of the heat pump unit.

7. An adaptive defrosting and oil return coordinated control device for a heat pump unit, characterized in that, The device is used to execute the adaptive defrosting and oil return coordinated control method for heat pump units as described in any one of claims 1-6, and the device comprises: The acquisition module is used to acquire the current outdoor heat exchanger coil temperature parameters of the heat pump unit when the heat pump unit is in defrosting operation. The judgment module is used to determine whether the heat pump unit meets the preset defrost exit conditions based on the current outdoor heat exchanger coil temperature parameters. The acquisition module is further configured to acquire the target operating parameters of the compressor of the heat pump unit when the judgment module determines that the heat pump unit meets the defrost exit condition; The judgment module is also used to determine whether the heat pump unit meets the preset oil return time condition based on the target operating parameters; the target operating parameters include operating frequency parameters and operating duration parameters; The control module is used to control the heat pump unit to perform a defrost exit operation when the judgment module determines that the heat pump unit meets the oil return time condition, and to control the heat pump unit to perform an oil return operation after the defrost exit operation is completed.

8. An adaptive defrosting and oil return coordinated control device for a heat pump unit, characterized in that, The device includes: Memory containing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the adaptive defrosting and oil return coordinated control method of the heat pump unit as described in any one of claims 1-6.

9. A computer storage medium, characterized in that, The computer storage medium stores computer instructions, which, when invoked, are used to execute the adaptive defrosting and oil return coordinated control method for the heat pump unit as described in any one of claims 1-6.

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