Air conditioner oil return control method, device, medium and air conditioner

Abstract

The application discloses an air conditioner oil return control method, device, medium and air conditioner, wherein when there is an oil return demand under abnormal working conditions, the target running frequency of the compressor is adjusted in stages by combining the oil return protection stage of the working condition parameters, including frequency increase, frequency prohibition, frequency decrease and shutdown, and the target running frequency is obtained; if the frequency is higher than the lower limit of the oil return frequency, the corresponding target oil return time is determined according to the frequency, and the oil return treatment is carried out. The scheme can flexibly adjust the running frequency of the compressor within the protection framework of the unit under abnormal working conditions, breaks through the limitation that the compressor cannot reach the required frequency for oil return under the original protection mechanism, and enables the compressor to reach the target running frequency meeting the oil return requirement, smoothly enters the normal oil return state, and effectively solves the problem that the air conditioner self-protection limits the compressor power under abnormal working conditions, thereby causing the oil return difficulty.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioning oil return control method, device, medium, and air conditioner. Background Technology

[0002] The normal operation of an air conditioning compressor relies on continuous oil return to ensure the stability of the lubrication system and the reliable operation of all compressor components. The air conditioning oil return process is as follows: adjust the electronic expansion valve to the specified opening, and at the same time allow the compressor to run at a set frequency for a certain period of time. Once this is completed, the oil return operation can be stopped.

[0003] However, under abnormal operating conditions such as extreme high temperatures and low grid voltage, the air conditioning unit will trigger its self-protection mechanism, limiting the compressor's operating power. This causes the compressor to operate in a low-frequency range for extended periods, or even maintain the minimum frequency, failing to reach the preset frequency as required and thus preventing it from entering the proper oil return operation state. This situation directly leads to insufficient compressor lubricating oil and deterioration of lubrication, subsequently accompanied by a series of problems such as excessive motor temperature rise, increased equipment power consumption, and a significant decrease in overall air conditioning energy efficiency, seriously affecting the unit's operational stability and service life. Summary of the Invention

[0004] Therefore, it is necessary to provide air conditioning oil return control methods, devices, media, and air conditioners to solve the problem that the self-protection mechanism of the air conditioner under abnormal operating conditions will limit the compressor power, preventing it from entering the oil return state.

[0005] In a first aspect, embodiments of this application provide an air conditioning oil return control method, the method comprising:

[0006] When abnormal operating conditions and oil return requirements are met, the current operating frequency of the compressor is adjusted in stages based on the oil return protection stage of the operating condition parameters to obtain the target operating frequency; wherein, the operating condition parameters are parameters used to determine whether abnormal operating conditions are met, and the stage adjustment process includes frequency increase processing, frequency increase prohibition processing, frequency decrease processing, and shutdown processing. When the target operating frequency is greater than the lower limit of the return oil frequency, the corresponding target return oil duration is determined based on the target operating frequency, and return oil processing is performed based on the target operating frequency and the target return oil duration.

[0007] In some embodiments of this application, the oil return protection stage includes a first stage, a second stage, a third stage, and a fourth stage, and the operating parameters in the first stage, the second stage, the third stage, and the fourth stage are in an increasing relationship. The step of periodically adjusting the compressor's current operating frequency based on the oil return protection stage in which the operating parameters are located to obtain the target operating frequency includes: When the operating parameters are in the first stage, the current operating frequency of the compressor is increased to obtain the target operating frequency; When the operating parameters are in the second stage, the compressor's current operating frequency is prevented from increasing to obtain the target operating frequency. When the operating parameters are in the third stage, the current operating frequency of the compressor is reduced to obtain the target operating frequency. When the operating parameters are in the fourth stage, the compressor is shut down at its current operating frequency to obtain the target operating frequency.

[0008] In some embodiments of this application, the target return oil duration includes a steady-state return oil duration and a non-steady-state return oil duration. The step of determining the corresponding target return oil duration based on the target operating frequency, and performing return oil processing based on the target operating frequency and the target return oil duration, includes: The steady-state oil return duration and the unsteady-state oil return duration are determined based on the target operating frequency. When the target operating frequency is stable within a first time period, oil return processing is performed based on the target operating frequency until the cumulative oil return time equals the steady-state oil return time. When the target operating frequency is in an unstable state within the first duration, oil return processing is performed based on the target operating frequency until the cumulative oil return duration equals the unstable oil return duration.

[0009] In some embodiments of this application, determining the steady-state oil return duration and the unsteady-state oil return duration based on the target operating frequency includes: Obtain a first calculated value; wherein the first calculated value is the product of the reference operating frequency and the reference operating time, the reference operating frequency is the default operating frequency of the compressor when performing oil return processing under non-abnormal operating conditions, and the reference operating time is the default operating time of the compressor when performing oil return processing under non-abnormal operating conditions; Divide the first calculated value by the target operating frequency to obtain the steady-state oil return time; Multiply the baseline running time by the duration compensation coefficient to obtain the unsteady-state oil return time.

[0010] In some embodiments of this application, when the target operating frequency is in an unstable state during the first duration, the method further includes: During the oil return process, when the target operating frequency is less than or equal to the lower limit of the oil return frequency, the cumulative oil return time is reset to zero.

[0011] In some embodiments of this application, the method further includes: When abnormal operating conditions are met but oil return requirements are not met, the current operating frequency of the compressor is adjusted in stages based on the non-oil return protection stage of the operating parameters to obtain the target operating frequency; wherein, the parameter range of the frequency increase process in the oil return protection stage is greater than the parameter range of the frequency increase process in the non-oil return protection stage.

[0012] In some embodiments of this application, before the step of performing phased adjustment processing on the current operating frequency of the compressor based on the oil return protection stage of the operating condition parameters to obtain the target operating frequency, the method further includes: When the operating parameters are greater than the corresponding parameter thresholds, it is determined that the abnormal operating conditions are met. If the compressor's current operating frequency is less than or equal to the lower limit of the oil return frequency, and this condition is maintained for a second duration, the oil return requirement is deemed met.

[0013] Secondly, embodiments of this application also provide an air conditioning oil return control device, the air conditioning oil return control device comprising: The frequency adjustment module is used to perform phased adjustment of the compressor's current operating frequency based on the oil return protection stage of the operating condition parameters when abnormal operating conditions and oil return requirements are met, to obtain the target operating frequency; wherein, the operating condition parameters are parameters used to determine whether abnormal operating conditions are met, and the phased adjustment process includes frequency increase processing, frequency increase prohibition processing, frequency decrease processing, and shutdown processing. The oil return module is used to determine the corresponding target oil return duration based on the target operating frequency when the target operating frequency is greater than the lower limit of the oil return frequency, and to perform oil return processing based on the target operating frequency and the target oil return duration.

[0014] Thirdly, this application also provides an air conditioner, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, it implements the steps in the above-mentioned air conditioning oil return control method.

[0015] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps in the aforementioned air conditioning oil return control method.

[0016] Fifthly, embodiments of this application also provide a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the methods provided in the various optional implementations described in embodiments of this application.

[0017] This invention provides an air conditioning oil return control method, device, medium, and air conditioner. Under abnormal operating conditions and with oil return demand, the compressor's current operating frequency is adjusted in stages (including frequency increase, frequency reduction prohibition, frequency decrease, and shutdown) based on the oil return protection stage of the operating parameters to determine the target operating frequency. If this frequency is higher than the lower limit of the oil return frequency, the corresponding target oil return duration is determined, and oil return processing is initiated. This solution can flexibly adjust the compressor's operating frequency within the unit's protection framework under abnormal operating conditions, overcoming the limitation of the compressor operating at a long-term low frequency under the original protection mechanism, which prevents it from reaching the required oil return frequency. It allows the compressor to reach the target operating frequency that meets the oil return requirements and smoothly enter the standardized oil return state. This effectively solves the problem of difficult oil return caused by the air conditioner's self-protection limiting the compressor's power under abnormal operating conditions, thereby ensuring the compressor's lubricating oil supply and lubrication effect, and avoiding a series of problems such as excessive motor temperature rise and increased power consumption. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0019] in: Figure 1 A flowchart illustrating the air conditioning oil return control method; Figure 2 This is a schematic diagram showing the parameter range corresponding to the non-return oil protection stage; Figure 3 A schematic diagram showing the parameter range corresponding to the oil return protection stage; Figure 4 A schematic diagram of the process for oil return treatment; Figure 5 This is a schematic diagram of the air conditioning oil return control device. Figure 6 This is a structural block diagram of an air conditioner. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0021] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application 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, system, product, or apparatus 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 apparatuses.

[0022] 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 this application. 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.

[0023] This invention provides an air conditioning oil return control method, apparatus, medium, and air conditioner. In some embodiments of this application, the provided air conditioning oil return control method can be applied to an air conditioner. Specifically, the air conditioner can be applied to different scenarios, including but not limited to industrial air conditioners or household air conditioners. In some embodiments of this application, the air conditioner can be a single unit, such as a cabinet air conditioner or a wall-mounted air conditioner; in some embodiments of this application, the air conditioner can also be a central air conditioning system composed of multiple air conditioner units, such as a multi-split air conditioner, an air-cooled heat pump system, or an air conditioning system with heat recovery function.

[0024] Please see Figure 1 , Figure 1 This is a flowchart illustrating the air conditioning oil return control method provided in an embodiment of this application. Although the logical sequence is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown in the figures.

[0025] In some embodiments of this application, before S101 performs phased adjustment processing on the current operating frequency of the compressor based on the oil return protection stage of the operating condition parameters to obtain the target operating frequency, the following steps may also be performed: when the operating condition parameters are greater than the corresponding parameter threshold, it is determined that the abnormal operating condition conditions are met. When the current operating frequency of the compressor is less than or equal to the lower limit of the oil return frequency and continues for a second duration, it is determined that the oil return demand conditions are met.

[0026] Among them, operating condition parameters are used to determine whether abnormal operating conditions are met. These operating condition parameters include, but are not limited to, condensing temperature, suction and discharge temperature, compressor current, and suction and discharge pressure, etc., and are not limited here. The lower limit of oil return frequency refers to the minimum operating frequency required for the compressor to carry out oil return processing.

[0027] For example, using condensing temperature as the operating parameter, the threshold value for condensing temperature is set to 60℃, the lower limit for oil return frequency is 40Hz, and the second duration is 30 minutes. When the air conditioner condensing temperature is detected to reach 62℃, it is determined that the abnormal operating condition is met. When the compressor's current operating frequency is 38Hz, and this frequency has been maintained for 30 minutes, it is determined that oil return is required, and the oil return requirement condition is met.

[0028] In some embodiments of this application, the air conditioning oil return control method provided in this application can also perform the following steps: when abnormal operating conditions are not met, but the oil return demand conditions are met, the air conditioning system will start the oil return process according to the normal oil return logic. Specifically, the electronic expansion valve is first adjusted to a preset oil return opening. Then control the compressor to operate at the default base frequency under normal operating conditions. Continuous operation until the preset baseline operating time is reached. After that, the normal oil return operation can be completed, and the electronic expansion valve can be restored to its normal operating opening, and the compressor can also be switched to its normal operating frequency range.

[0029] In some embodiments of this application, the air conditioning oil return control method provided in this application can also perform the following steps: when abnormal operating conditions are met but oil return demand conditions are not met, the current operating frequency of the compressor is adjusted in stages based on the non-oil return protection stage of the operating condition parameters to obtain the target operating frequency.

[0030] The parameter range for frequency upscaling during the oil return protection phase is greater than that during the non-oil return protection phase. The oil return protection phase refers to the unit protection phase in which the operating parameters are located when the air conditioner simultaneously meets both abnormal operating conditions and oil return demand conditions. The non-oil return protection phase refers to the unit protection phase in which the operating parameters are located when the air conditioner meets abnormal operating conditions but does not meet the oil return demand conditions. See details in [link to relevant documentation]. Figure 2 and Figure 3 ,in, Figure 2 This is a schematic diagram showing the parameter range corresponding to the non-return oil protection stage. Figure 3 This is a schematic diagram showing the parameter range corresponding to the oil return protection stage.

[0031] Optionally, see Figure 2 , This indicates the operating parameters currently being detected by the system. The frequency ramp value is the operating condition parameter set for the system. The frequency limit value is the operating condition parameter set for the non-return oil protection phase of the system. The frequency reduction value is the operating condition parameter set for the non-return oil protection phase of the system. The system's set operating parameters and shutdown values ​​are defined. The non-oil return protection phase includes four stages: stage one, stage two, stage three, and stage four. The operating parameters in stage one, stage two, stage three, and stage four exhibit an increasing relationship. Based on the non-oil return protection stage in which the operating parameters are located, the compressor's current operating frequency is adjusted in stages to obtain the target operating frequency. The specific steps include the following: When the operating parameters are in the first stage, that is, when At this time, the current operating frequency of the compressor is increased. The frequency increase process can be carried out slowly at a preset first rate, which can be set to 0.1 Hz / second. By gradually increasing the frequency, the compressor can smoothly transition to an operating state that is suitable for the current working conditions, and finally obtain the target operating frequency.

[0032] When the operating parameters are in the second stage, that is, when When the compressor's current operating frequency is not allowed to increase, the compressor maintains its current operating frequency and is not allowed to continue to increase it. However, it can perform frequency reduction operation according to subsequent changes in operating conditions to ensure the stability of compressor operation and thus determine the target operating frequency after processing.

[0033] When the operating parameters are in the third stage, that is, when At this time, the current operating frequency of the compressor is reduced. The frequency reduction process follows a preset second rate, which can be set to 0.2 Hz / second. By gradually reducing the frequency, the compressor is prevented from overload due to deteriorating operating conditions, and the target operating frequency is finally obtained.

[0034] When the operating parameters are in the fourth stage, that is, when Additionally, a preset duration for the judgment condition can be set, such as 5 seconds. When the operating parameters meet this condition, the system will shut down the compressor at its current operating frequency, directly cutting off the compressor's operating command. At this point, the target operating frequency after processing is 0Hz, corresponding to the shutdown state, until... It then returned to normal operation.

[0035] The above embodiments adjust the compressor's current operating frequency in stages based on the non-oil return protection stage of the operating condition parameters. This allows the compressor's operating frequency to adapt to real-time changes in operating conditions. It can maintain a reasonable operating frequency to ensure the unit's cooling or heating effect when the operating conditions do not deteriorate, and can also limit, reduce, or even stop the compressor in time when the operating conditions approach the dangerous threshold, thus avoiding problems such as excessive temperature rise and accelerated wear of components due to overload operation.

[0036] Specifically, the air conditioning oil return control method provided in this application includes steps S101-S102, as follows: S101, when abnormal operating conditions and oil return requirements are met, the current operating frequency of the compressor is adjusted in stages based on the oil return protection stage of the operating parameters to obtain the target operating frequency.

[0037] The target operating frequency refers to the operating frequency that the compressor will execute after the current operating frequency of the compressor has been adjusted in stages.

[0038] Optionally, the methods for determining abnormal operating conditions and oil return demand conditions are the same as those described above, and will not be repeated here.

[0039] In some embodiments of this application, see Figure 3 These are the current operating parameters of the system. The slow frequency ramp value is the operating condition parameter set for the system. The frequency limit value for the operating parameters during the oil return protection phase of the system is set. The frequency reduction value is the operating condition parameter set for the oil return protection phase of the system. The shutdown values ​​for the operating parameters set for the system. The oil return protection stage includes a first stage, a second stage, a third stage, and a fourth stage. The operating parameters in the first stage, the second stage, the third stage, and the fourth stage show an increasing relationship. S101 performs a phased adjustment of the compressor's current operating frequency based on the oil return protection stage in which the operating parameters are located, to obtain the target operating frequency. Specifically, this includes the following steps: When the operating parameters are in the first stage, that is, when At this time, the current operating frequency of the compressor is increased. The frequency increase process can be carried out slowly at a preset first rate, which can be set to 0.1 Hz / second. By gradually increasing the frequency, the compressor can smoothly transition to an operating state that is suitable for the current working conditions, and finally obtain the target operating frequency.

[0040] When the operating parameters are in the second stage, that is, when When the compressor's current operating frequency is not allowed to increase, the compressor maintains its current operating frequency and is not allowed to continue to increase it. However, it can perform frequency reduction operation according to subsequent changes in operating conditions to ensure the stability of compressor operation and thus determine the target operating frequency after processing.

[0041] When the operating parameters are in the third stage, that is, when At this time, the current operating frequency of the compressor is reduced. The frequency reduction process follows a preset second rate, which can be set to 0.2 Hz / second. By gradually reducing the frequency, the compressor is prevented from overload due to deteriorating operating conditions, and the target operating frequency is finally obtained.

[0042] When the operating parameters are in the fourth stage, that is, when When the compressor's current operating frequency is met, the system will shut it down. Alternatively, a preset duration can be set, such as 5 seconds. Once the operating parameters meet this condition, the system will shut down the compressor, directly cutting off its operation. The target operating frequency after this process is 0Hz, corresponding to the shutdown state, until... It then returned to normal operation.

[0043] Understandable, Figure 2 The non-oil return protection phase applies to scenarios where abnormal operating conditions are met but oil return requirements are not. In this case, the control objective is only to ensure the safe and stable operation of the compressor, without needing to consider oil return requirements. Figure 3 The oil return protection phase is applicable to scenarios that meet both abnormal operating conditions and oil return requirements. In this case, the air conditioner not only needs to cope with extreme high temperatures and low grid voltage, but also needs to solve the problem of the compressor failing to return oil due to low-frequency operation. Correspondingly, the parameter range for frequency increase processing during the oil return protection phase […]. The frequency rise range is significantly wider than that during the non-return oil protection phase. During the non-oil return protection phase, the frequency ramp-up range is relatively narrow, and the compressor can easily reach the frequency limiting threshold and enter a prohibited frequency ramp-up state, only able to maintain the basic operating frequency, which cannot meet the oil return requirements. However, when the system is in the oil return protection phase, the wider frequency ramp-up parameter range means that the compressor can continuously ramp up at a preset rate before the operating parameters reach a higher threshold, and will not enter the prohibited frequency ramp-up phase prematurely. Even if there are some fluctuations in the operating conditions, the compressor can maintain a relatively high operating frequency within the protection framework, which just meets the frequency requirements for oil return.

[0044] S102, when the target operating frequency is greater than the lower limit of the return oil frequency, determine the corresponding target return oil duration based on the target operating frequency, and perform return oil processing based on the target operating frequency and the target return oil duration.

[0045] The target oil return time refers to the specified duration determined based on the adjusted target operating frequency, during which the compressor must continuously operate at the target operating frequency to complete the oil return operation.

[0046] Optionally, a preset frequency-return oil duration matching table is retrieved, and the return oil duration that uniquely corresponds to the current target operating frequency is found in the table and set as the target return oil duration. Then, the compressor is controlled to run continuously at the target operating frequency until the target return oil duration ends, and the electronic expansion valve is kept at a specified opening to complete the return oil process.

[0047] In some embodiments of this application, the target oil return time includes a steady-state oil return time and a non-steady-state oil return time, such as... Figure 4 As shown, S102 determines the corresponding target return oil duration based on the target operating frequency, and performs return oil processing based on the target operating frequency and the target return oil duration, including steps S1021-S1023, as follows: S1021, determine the steady-state oil return duration and the unsteady-state oil return duration based on the target operating frequency.

[0048] Among them, steady-state oil return time refers to the preset oil return time required for the compressor to complete the oil return process at the target operating frequency when the target operating frequency remains stable within a specified first time period. Unsteady-state oil return time refers to the preset oil return time required for the compressor to complete the oil return process at the target operating frequency when the target operating frequency is in an unstable state within a specified first time period.

[0049] Optionally, the basic steady-state oil return duration and basic unsteady-state oil return duration corresponding to the frequency range of the target operating frequency can be determined first. Then, the two basic durations can be dynamically corrected in combination with the current operating parameters of the air conditioner to obtain the corrected steady-state oil return duration and unsteady-state oil return duration.

[0050] In some embodiments of this application, S1021, which determines the steady-state and unsteady-state oil return durations based on the target operating frequency, specifically includes the following steps: obtaining a first calculated value; dividing the first calculated value by the target operating frequency to obtain the steady-state oil return duration; and multiplying the reference operating duration by the duration compensation coefficient to obtain the unsteady-state oil return duration.

[0051] The first calculated value is the product of the reference operating frequency and the reference operating time. The reference operating frequency is the default operating frequency of the compressor when performing oil return processing under non-abnormal operating conditions, and the reference operating time is the default operating time of the compressor when performing oil return processing under non-abnormal operating conditions.

[0052] Optionally, the formula for calculating the steady-state oil return time is expressed as: , This refers to the steady-state oil return time. The reference operating frequency is, for example, 60Hz; The baseline runtime, for example, 10 minutes; The target operating frequency is used. The duration compensation coefficient can be a fixed value, such as 3; the duration compensation coefficient can also be linked to the frequency fluctuation. The greater the frequency fluctuation, the longer the return oil time, thereby offsetting the impact of frequency fluctuation on the return oil effect.

[0053] In the above embodiments, the steady-state oil return time is the product of the reference operating frequency and the reference operating time as the energy equivalent reference value, and then divided by the target operating frequency to achieve the equivalent oil return energy replenishment of "the lower the frequency, the longer the time"; the unsteady-state oil return time is offset by multiplying the reference operating time by the time compensation coefficient, and the impact of frequency fluctuation on oil return efficiency is offset by extending the time.

[0054] S1022, when the target operating frequency is stable within the first time period, oil return processing is performed based on the target operating frequency until the cumulative oil return time equals the steady-state oil return time.

[0055] Among them, the cumulative oil return time refers to the actual cumulative operating time of the compressor to carry out oil return processing at the target operating frequency.

[0056] Optionally, if the target operating frequency is detected to remain unchanged within a first duration (e.g., fixed at 30 seconds), it is determined to be in a stable state. The compressor is controlled to operate at the target operating frequency and the electronic expansion valve is synchronously kept at a specified opening to carry out oil return processing. At the same time, the actual oil return time is accumulated. When the accumulated oil return time reaches the matching steady-state oil return time, the oil return processing is stopped immediately.

[0057] S1023, when the target operating frequency is in an unstable state within the first duration, oil return processing is performed based on the target operating frequency until the cumulative oil return duration equals the unstable oil return duration.

[0058] Optionally, if the target operating frequency is detected to fluctuate within a first duration (e.g., fixed at 30s), it is determined to be in an unstable state. The compressor is controlled to operate at the target operating frequency and the electronic expansion valve is kept at a specified opening to carry out oil return processing. The actual oil return time is accumulated simultaneously. When the accumulated oil return time reaches the matching unsteady oil return time, the oil return processing is stopped immediately.

[0059] In some embodiments of this application, when the target operating frequency is in an unstable state within a first duration, the method may further perform the following steps: during the oil return process, when the target operating frequency is less than or equal to the lower limit of the oil return frequency, the accumulated oil return duration is reset to zero.

[0060] In other words, during the oil return process of the compressor based on the target operating frequency, the air conditioner continuously monitors the real-time value of the target operating frequency. Once the target operating frequency drops to or falls below the lower limit of the oil return frequency, the accumulated oil return time reset mechanism is immediately triggered, resetting the currently accumulated oil return time to zero. This setting avoids the accumulation of invalid oil return time, ensuring that only when the target operating frequency meets the oil return requirements is the valid oil return time counted, thereby guaranteeing that the final oil return effect can meet the preset standard.

[0061] In some embodiments of this application, the system continuously monitors the target operating frequency after phased adjustments. Real-time values. Once the target operating frequency is detected... If the oil return frequency remains below or equal to the lower limit for a third consecutive time interval, such as 30 seconds, the system will determine that the current operating conditions cannot support the compressor to perform effective oil return processing. At this point, the system will immediately control the electronic expansion valve to exit the current oil return opening control mode and return to free operation, allowing the electronic expansion valve to autonomously adjust its opening according to the unit's real-time operating conditions, ensuring the stability of the air conditioning's basic cooling or heating functions. After the electronic expansion valve returns to free operation and a fourth time interval, such as 3 minutes, the system will re-trigger the oil return judgment process, re-checking the current operating parameters and compressor operating frequency to see if they meet the oil return requirements, and then deciding whether to re-execute the corresponding oil return action.

[0062] The aforementioned S1021-S1023, by distinguishing between steady-state and non-steady-state operating states and matching the corresponding oil return duration, can accurately adapt to the oil return requirements of the compressor under different frequency conditions. When the target operating frequency is stable, performing oil return according to the steady-state oil return duration ensures oil return efficiency; when the target operating frequency fluctuates, performing oil return according to the non-steady-state oil return duration can offset the impact of frequency fluctuations on the oil return effect. Ultimately, this ensures that the compressor can achieve sufficient oil return effect under abnormal operating conditions, regardless of whether the frequency is stable, effectively avoiding equipment failure caused by insufficient lubricating oil, and improving the unit's operational stability and service life.

[0063] The above embodiment, when operating under abnormal conditions and with oil return requirements, adjusts the compressor's current operating frequency in stages (including frequency increase, frequency reduction prohibition, frequency decrease, and shutdown) based on the oil return protection phase of the operating parameters to determine the target operating frequency. If this frequency is higher than the lower limit of the oil return frequency, the corresponding target oil return duration is determined and oil return processing is initiated. This solution can flexibly adjust the compressor's operating frequency within the unit's protection framework under abnormal operating conditions, breaking through the limitation of the compressor operating at a long-term low frequency under the original protection mechanism, which prevents it from reaching the frequency required for oil return. It allows the compressor to reach the target operating frequency that meets the oil return requirements and smoothly enter the standardized oil return state. This effectively solves the problem of difficult oil return caused by the air conditioner's self-protection limiting the compressor's power under abnormal operating conditions, thereby ensuring the compressor's lubricating oil supply and lubrication effect, and avoiding a series of problems such as excessive motor temperature rise and increased power consumption.

[0064] To facilitate better implementation of the air conditioning oil return control method of this application, this application also provides an air conditioning oil return control device based on the above-described air conditioning oil return control method. The meanings of the terms used are the same as in the above-described air conditioning oil return control method, and specific implementation details can be found in the description of the method embodiments.

[0065] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of the air conditioning oil return control device provided in the embodiments of this application, which may specifically include: The frequency adjustment module 501 is used to perform phased adjustment of the compressor's current operating frequency based on the oil return protection stage of the operating condition parameters when abnormal operating conditions and oil return requirements are met, so as to obtain the target operating frequency. The operating condition parameters are used to determine whether abnormal operating conditions are met. The phased adjustment process includes frequency increase processing, frequency increase prohibition processing, frequency decrease processing, and shutdown processing. The oil return module 502 is used to determine the corresponding target oil return duration based on the target operating frequency when the target operating frequency is greater than the lower limit of the oil return frequency, and to perform oil return processing based on the target operating frequency and the target oil return duration.

[0066] In the above embodiment, the frequency adjustment module 501 is used to adjust the compressor's current operating frequency in stages, including frequency increase, frequency restriction, frequency decrease, and shutdown, based on the oil return protection stage of the operating parameters when there is an abnormal operating condition and oil return is required, and to obtain the target operating frequency. The oil return module 502 is used to determine the corresponding target oil return duration and carry out oil return processing if the frequency is higher than the lower limit of the oil return frequency. This solution can flexibly adjust the compressor operating frequency within the unit protection framework under abnormal operating conditions, breaking through the limitation of the compressor operating at a low frequency for a long time under the original protection mechanism, which makes it impossible to reach the frequency required for oil return. It allows the compressor to reach the target operating frequency that meets the oil return requirements and smoothly enter the standardized oil return state. It effectively solves the problem of difficult oil return caused by the air conditioner's self-protection limiting the compressor power under abnormal operating conditions, thereby ensuring the compressor's lubricating oil supply and lubrication effect, and avoiding a series of problems such as excessive motor temperature rise and increased power consumption.

[0067] In some embodiments of this application, the oil return protection stage includes a first stage, a second stage, a third stage, and a fourth stage, and the operating parameters in the first stage, the second stage, the third stage, and the fourth stage are in an increasing relationship. The frequency adjustment module 501 performs phased adjustment processing on the current operating frequency of the compressor based on the oil return protection stage in which the operating parameters are located, to obtain the target operating frequency, including: When the operating parameters are in the first stage, the current operating frequency of the compressor is increased to obtain the target operating frequency; When the operating parameters are in the second stage, the compressor's current operating frequency is prevented from increasing to obtain the target operating frequency. When the operating parameters are in the third stage, the current operating frequency of the compressor is reduced to obtain the target operating frequency. When the operating parameters are in the fourth stage, the compressor is shut down at its current operating frequency to obtain the target operating frequency.

[0068] In some embodiments of this application, the target return oil duration includes a steady-state return oil duration and a non-steady-state return oil duration. The return oil module 502 determines the corresponding target return oil duration based on the target operating frequency, and performs return oil processing based on the target operating frequency and the target return oil duration, including: The steady-state and unsteady-state oil return durations are determined based on the target operating frequency. When the target operating frequency is stable within the first time period, oil return processing is performed based on the target operating frequency until the cumulative oil return time equals the steady-state oil return time. When the target operating frequency is in an unstable state within the first time period, oil return processing is performed based on the target operating frequency until the cumulative oil return time equals the unstable oil return time.

[0069] In some embodiments of this application, the oil return module 502 determines the steady-state oil return duration and the non-steady-state oil return duration based on the target operating frequency, including: Obtain the first calculated value; wherein, the first calculated value is the product of the reference operating frequency and the reference operating time, the reference operating frequency is the default operating frequency of the compressor when performing oil return processing under non-abnormal operating conditions, and the reference operating time is the default operating time of the compressor when performing oil return processing under non-abnormal operating conditions; Divide the first calculated value by the target operating frequency to obtain the steady-state oil return time; Multiply the baseline running time by the duration compensation coefficient to obtain the unsteady-state oil return time.

[0070] In some embodiments of this application, when the target operating frequency is in an unstable state during a first duration, the air conditioning oil return control device is further configured to: During the oil return process, when the target operating frequency is less than or equal to the lower limit of the oil return frequency, the accumulated oil return time is reset to zero.

[0071] In some embodiments of this application, the air conditioning oil return control device is also used for: When abnormal operating conditions are met but oil return requirements are not met, the current operating frequency of the compressor is adjusted in stages based on the non-oil return protection stage of the operating parameters to obtain the target operating frequency; wherein, the parameter range of frequency increase processing during the oil return protection stage is greater than the parameter range of frequency increase processing during the non-oil return protection stage.

[0072] In some embodiments of this application, the frequency adjustment module 501 performs phased adjustment processing on the current operating frequency of the compressor based on the oil return protection stage of the operating condition parameters. Before obtaining the target operating frequency, it is further used for: When the operating parameters are greater than the corresponding parameter thresholds, it is determined that the abnormal operating conditions are met. If the compressor's current operating frequency is less than or equal to the lower limit of the oil return frequency, and this condition is maintained for a second duration, the oil return requirement is deemed met.

[0073] In addition, this application also provides an air conditioner, such as Figure 6 As shown, it illustrates the structural diagram of the air conditioner involved in this application, specifically: The air conditioner may include components such as a processor 601 with one or more processing cores, a memory 602 with one or more computer-readable storage media, a power supply 603, and an input unit 604. Those skilled in the art will understand that... Figure 6 The air conditioner structure shown does not constitute a limitation on the air conditioner and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein: The processor 601 is the control center of the air conditioner. It connects to various parts of the air conditioner via various interfaces and lines. By running or executing software programs and / or modules stored in the memory 602, and by calling data stored in the memory 602, it performs various functions and processes data, thereby providing overall monitoring of the air conditioner. Optionally, the processor 601 may include one or more processing cores; preferably, the processor 601 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications, and the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 601.

[0074] The memory 602 can be used to store software programs and modules. The processor 601 executes various functional applications and data processing by running the software programs and modules stored in the memory 602. The memory 602 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function, etc.; the data storage area may store data created based on the use of the air conditioner, etc. In addition, the memory 602 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 602 may also include a memory controller to provide the processor 601 with access to the memory 602.

[0075] The air conditioner also includes a power supply 603 that supplies power to the various components. Preferably, the power supply 603 can be logically connected to the processor 601 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 603 may also include one or more DC or AC power supplies, recharging systems, power equipment debugging circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0076] The air conditioner may also include an input unit 604, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0077] Although not shown, the air conditioner may also include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 601 in the air conditioner will load the executable files corresponding to the processes of one or more application programs into the memory 602 according to the following instructions, and the processor 601 will run the application programs stored in the memory 602 to realize the steps in any of the air conditioner oil return control methods provided in this application embodiment: when the abnormal operating conditions are met and the oil return demand conditions are met, the current operating frequency of the compressor is adjusted in stages based on the oil return protection stage of the operating condition parameters to obtain the target operating frequency; wherein, the operating condition parameters are parameters used to determine whether the abnormal operating conditions are met, and the stage adjustment process includes frequency increase processing, frequency increase prohibition processing, frequency decrease processing, and shutdown processing; when the target operating frequency is greater than the lower limit of the oil return frequency, the corresponding target oil return duration is determined based on the target operating frequency, and oil return processing is performed based on the target operating frequency and the target oil return duration.

[0078] The above embodiment, when operating under abnormal conditions and with oil return requirements, adjusts the compressor's current operating frequency in stages (including frequency increase, frequency reduction prohibition, frequency decrease, and shutdown) based on the oil return protection phase of the operating parameters to determine the target operating frequency. If this frequency is higher than the lower limit of the oil return frequency, the corresponding target oil return duration is determined and oil return processing is initiated. This solution can flexibly adjust the compressor's operating frequency within the unit's protection framework under abnormal operating conditions, breaking through the limitation of the compressor operating at a long-term low frequency under the original protection mechanism, which prevents it from reaching the frequency required for oil return. It allows the compressor to reach the target operating frequency that meets the oil return requirements and smoothly enter the standardized oil return state. This effectively solves the problem of difficult oil return caused by the air conditioner's self-protection limiting the compressor's power under abnormal operating conditions, thereby ensuring the compressor's lubricating oil supply and lubrication effect, and avoiding a series of problems such as excessive motor temperature rise and increased power consumption.

[0079] For details on the implementation of each of the above operations, please refer to the previous examples, which will not be repeated here.

[0080] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by instructions, or by instructions controlling related hardware. These instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0081] Therefore, this application provides a computer-readable storage medium storing a computer program that can be loaded by a processor to execute the steps in any of the air conditioning oil return control methods provided in this application.

[0082] For details on the implementation of each of the above operations, please refer to the previous examples, which will not be repeated here.

[0083] The computer-readable storage medium may include: read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0084] Since the instructions stored in the computer-readable storage medium can execute the steps in any of the air conditioning oil return control methods provided in this application, the beneficial effects that any of the air conditioning oil return control methods provided in this application can achieve can be realized, as detailed in the preceding embodiments, and will not be repeated here.

[0085] The above provides a detailed description of an air conditioning oil return control method, device, air conditioner, and computer-readable storage medium provided in this application. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An air conditioning oil return control method, characterized in that, The method includes: When abnormal operating conditions and oil return requirements are met, the current operating frequency of the compressor is adjusted in stages based on the oil return protection stage of the operating condition parameters to obtain the target operating frequency; wherein, the operating condition parameters are parameters used to determine whether abnormal operating conditions are met, and the stage adjustment process includes frequency increase processing, frequency increase prohibition processing, frequency decrease processing, and shutdown processing. When the target operating frequency is greater than the lower limit of the return oil frequency, the corresponding target return oil duration is determined based on the target operating frequency, and return oil processing is performed based on the target operating frequency and the target return oil duration.

2. The air conditioning oil return control method according to claim 1, characterized in that, The oil return protection stage includes a first stage, a second stage, a third stage, and a fourth stage. The operating parameters in the first stage, the second stage, the third stage, and the fourth stage exhibit an increasing relationship. The process of adjusting the compressor's current operating frequency in stages based on the oil return protection stage of the operating parameters to obtain the target operating frequency includes: When the operating parameters are in the first stage, the current operating frequency of the compressor is increased to obtain the target operating frequency; When the operating parameters are in the second stage, the compressor's current operating frequency is prevented from increasing to obtain the target operating frequency. When the operating parameters are in the third stage, the current operating frequency of the compressor is reduced to obtain the target operating frequency. When the operating parameters are in the fourth stage, the compressor is shut down at its current operating frequency to obtain the target operating frequency.

3. The air conditioning oil return control method according to claim 1, characterized in that, The target oil return time includes steady-state oil return time and non-steady-state oil return time. The step of determining the corresponding target oil return time based on the target operating frequency, and performing oil return processing based on the target operating frequency and the target oil return time, includes: The steady-state oil return duration and the unsteady-state oil return duration are determined based on the target operating frequency. When the target operating frequency is stable within a first time period, oil return processing is performed based on the target operating frequency until the cumulative oil return time equals the steady-state oil return time. When the target operating frequency is in an unstable state within the first duration, oil return processing is performed based on the target operating frequency until the cumulative oil return duration equals the unstable oil return duration.

4. The air conditioning oil return control method according to claim 3, characterized in that, The determination of the steady-state oil return duration and the unsteady-state oil return duration based on the target operating frequency includes: Obtain a first calculated value; wherein the first calculated value is the product of the reference operating frequency and the reference operating time, the reference operating frequency is the default operating frequency of the compressor when performing oil return processing under non-abnormal operating conditions, and the reference operating time is the default operating time of the compressor when performing oil return processing under non-abnormal operating conditions; Divide the first calculated value by the target operating frequency to obtain the steady-state oil return time; Multiply the baseline running time by the duration compensation coefficient to obtain the unsteady-state oil return time.

5. The air conditioning oil return control method according to claim 3, characterized in that, When the target operating frequency is in an unstable state during the first duration, the method further includes: During the oil return process, when the target operating frequency is less than or equal to the lower limit of the oil return frequency, the cumulative oil return time is reset to zero.

6. The air conditioning oil return control method according to claim 1, characterized in that, The method further includes: When abnormal operating conditions are met but oil return requirements are not met, the current operating frequency of the compressor is adjusted in stages based on the non-oil return protection stage of the operating parameters to obtain the target operating frequency; wherein, the parameter range of the frequency increase process in the oil return protection stage is greater than the parameter range of the frequency increase process in the non-oil return protection stage.

7. The air conditioning oil return control method according to claim 1, characterized in that, Before the step of adjusting the compressor's current operating frequency in stages based on the oil return protection phase of the operating condition parameters to obtain the target operating frequency, the following steps are also included: When the operating parameters are greater than the corresponding parameter thresholds, it is determined that the abnormal operating conditions are met. If the compressor's current operating frequency is less than or equal to the lower limit of the oil return frequency, and this condition is maintained for a second duration, the oil return requirement is deemed met.

8. An air conditioning oil return control device, characterized in that, The air conditioning oil return control device includes: The frequency adjustment module is used to perform phased adjustment of the compressor's current operating frequency based on the oil return protection stage of the operating condition parameters when abnormal operating conditions and oil return requirements are met, to obtain the target operating frequency; wherein, the operating condition parameters are parameters used to determine whether abnormal operating conditions are met, and the phased adjustment process includes frequency increase processing, frequency increase prohibition processing, frequency decrease processing, and shutdown processing. The oil return module is used to determine the corresponding target oil return duration based on the target operating frequency when the target operating frequency is greater than the lower limit of the oil return frequency, and to perform oil return processing based on the target operating frequency and the target oil return duration.

9. A computer-readable storage medium, characterized in that, The device stores a computer program that, when executed by a processor, causes the processor to perform the steps of the method as described in any one of claims 1 to 7.

10. An air conditioner, characterized in that, It includes a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of the method as described in any one of claims 1 to 7.

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