Compressor oil return control method, device and air conditioner

Abstract

The application discloses a compressor oil return control method, device and air conditioner. The method comprises the following steps: when an oil return entering condition is met, an outdoor environment temperature is obtained; according to a temperature range in which the outdoor environment temperature is located, an oil return frequency and an oil return time are determined; during the oil return process, the current oil return frequency is adjusted according to a condensation temperature and the outdoor environment temperature; and when the oil return time is reached, the oil return is exited. In different outdoor ring temperature working conditions, the oil return frequency and the oil return time matched with the current working condition are adopted, the oil return amount can be adjusted according to the difference of the outdoor environment temperature, and the oil return frequency is further adjusted according to the condensation temperature and the outdoor environment temperature in combination with the actual operation condition of the air conditioner, so that the most suitable oil return frequency can be selected, the appropriate oil return amount is ensured, energy is saved, different working conditions are adapted, and the problem that the adaptability is poor in different working conditions when the compressor adopts the fixed oil return frequency and the oil return time for oil return is solved.

Description

Technical Field

[0001] This invention relates to the field of compressor oil return control technology, and more specifically, to a compressor oil return control method, device, and air conditioner. Background Technology

[0002] During operation, variable frequency air conditioners discharge lubricating oil along with the refrigerant from the compressor, entering the condenser, evaporator, and piping. This discharged lubricating oil needs to be returned to the compressor via oil return control; otherwise, the compressor will be damaged due to insufficient oil.

[0003] Currently, air conditioning oil return generally uses a fixed oil return frequency and a fixed oil return time. That is, the compressor is controlled to run at a fixed oil return frequency, and the oil return ends when the fixed oil return time is reached.

[0004] However, the compressor frequency of an air conditioner is constantly changing during operation, and the oil discharge rate is also constantly changing. Generally, the higher the frequency, the greater the oil discharge rate, and the lower the frequency, the smaller the oil discharge rate. That is, the required oil return amount varies depending on the operating frequency of the air conditioning unit. Therefore, this oil return control method has poor adaptability under different operating conditions. If the oil return time is reached but the oil return is not complete, ending the oil return at this point may result in insufficient oil return, leading to poor compressor lubrication, damage to the compressor, and shortening its service life. In severe cases, it may cause the compressor's mechanical parts to stall, seize, or stop, reducing the overall reliability of the unit. If the oil return is completed before the oil return time is reached, it will lead to unnecessary oil return time and excessive oil return, increasing energy consumption and wasting energy.

[0005] There is currently no effective solution to the problem that existing compressors use fixed oil return frequencies and times for oil return, resulting in poor adaptability under different operating conditions. Summary of the Invention

[0006] This invention provides a compressor oil return control method, device, and air conditioner to at least solve the problem that existing compressors use fixed oil return frequencies and times for oil return, resulting in poor adaptability under different operating conditions.

[0007] To address the aforementioned technical problems, embodiments of the present invention provide a compressor oil return control method, comprising:

[0008] When the return oil entry conditions are met, the outdoor ambient temperature is obtained;

[0009] The return oil frequency and return oil time are determined based on the outdoor ambient temperature range.

[0010] During the oil return process, the current oil return frequency is adjusted according to the condensation temperature and the outdoor ambient temperature.

[0011] When the specified return oil time is reached, the return oil process is terminated.

[0012] Optionally, the return oil frequency and return oil time are determined based on the temperature range of the outdoor ambient temperature, including:

[0013] Determine the temperature range within which the outdoor ambient temperature falls;

[0014] The oil return frequency and oil return time corresponding to the temperature range are determined based on the pre-stored information.

[0015] The system pre-stores the correspondence between temperature range, oil return frequency, and oil return time, and this correspondence applies to all air conditioners of different models within the same series.

[0016] Optionally, the return oil frequency and return oil time corresponding to the temperature range are determined based on pre-stored information, including:

[0017] If the outdoor ambient temperature is less than or equal to the first preset temperature and remains so for the first preset time, then the return oil frequency is determined to be the first frequency and the return oil time is determined to be the first time.

[0018] If the outdoor ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, and continues for the second preset time, then the return oil frequency is determined to be the second frequency and the return oil time is determined to be the second time.

[0019] If the outdoor ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, and this temperature persists for the second preset time, then the return oil frequency is determined to be the third frequency and the return oil time is determined to be the third time.

[0020] If the outdoor ambient temperature is greater than the third preset temperature and continues for the first preset time, then the return oil frequency is determined to be the fourth frequency and the return oil time is determined to be the fourth time.

[0021] Among them, the fourth frequency < the first frequency < the third frequency < the second frequency, and the first time = the third time < the second time < the fourth time.

[0022] Optionally, the current oil return frequency can be adjusted based on the condensation temperature and the outdoor ambient temperature, including:

[0023] The current condensation temperature is periodically acquired, and the difference between the current condensation temperature and the outdoor ambient temperature is calculated.

[0024] If the difference is less than the lower limit of the preset temperature range, the oil return frequency is increased.

[0025] If the difference is greater than the upper limit of the preset temperature range, the oil return frequency is reduced.

[0026] Optionally, after calculating the difference between the current condensation temperature and the outdoor ambient temperature, the method further includes:

[0027] If the difference is within the preset temperature range, then obtain the current intake temperature and the current evaporation temperature;

[0028] Calculate the difference between the intake temperature and the evaporation temperature;

[0029] If the difference between the intake temperature and the evaporation temperature is less than a preset threshold, the opening of the electronic expansion valve between the evaporator and the condenser is reduced.

[0030] Optionally, if any of the following conditions are detected before obtaining the outdoor ambient temperature, the return oil entry condition is determined to be met:

[0031] After startup, the compressor's cumulative running time reaches the third preset time;

[0032] After the last oil return cycle was completed, the compressor's cumulative running time reached the fourth preset time.

[0033] After the last oil return cycle is completed, the compressor's cumulative running time reaches the cumulative time corresponding to the current outdoor ambient temperature.

[0034] This invention also provides a compressor oil return control device, comprising:

[0035] The acquisition module is used to acquire the outdoor ambient temperature when the return oil entry conditions are met.

[0036] The determination module is used to determine the oil return frequency and oil return time based on the temperature range of the outdoor ambient temperature.

[0037] The adjustment module is used to adjust the current oil return frequency during the oil return process based on the condensation temperature and the outdoor ambient temperature.

[0038] The exit module is used to exit the oil return process when the oil return time is reached.

[0039] This invention also provides an air conditioner, including: the compressor oil return control device described in this invention.

[0040] This invention also provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described in this invention.

[0041] This invention also provides a non-volatile computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the method described in this invention.

[0042] By applying the technical solution of this invention, the oil return frequency and time are determined based on the outdoor ambient temperature. During the oil return process, the current oil return frequency is adjusted according to the condensing temperature and the outdoor ambient temperature. When the oil return time is reached, the oil return process is terminated. Under different ambient temperature conditions, an oil return frequency and time matching the current operating condition are adopted. The oil return volume can be adjusted according to different outdoor ambient temperatures. Furthermore, by combining the actual operation of the air conditioner, the oil return frequency can be appropriately adjusted according to the condensing temperature and the outdoor ambient temperature, thus selecting the most suitable oil return frequency, ensuring an appropriate oil return volume, saving energy, and adapting well to different operating conditions. This solves the problem that compressors using fixed oil return frequencies and times have poor adaptability under different operating conditions, resulting in more intelligent control. Attached Figure Description

[0043] Figure 1 This is a flowchart of the compressor oil return control method provided in Embodiment 1 of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of the air conditioner provided in Embodiment 2 of the present invention;

[0045] Figure 3 This is a schematic diagram illustrating the relationship between different outdoor ambient temperatures and compressor oil return frequency provided in Embodiment 2 of the present invention;

[0046] Figure 4 This is a flow chart of the oil return control provided in Embodiment 2 of the present invention;

[0047] Figure 5 This is a structural block diagram of the compressor oil return control device provided in Embodiment 3 of the present invention. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0049] It should be noted that the terms "first," "second," etc., used in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0050] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0051] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0052] Example 1

[0053] This embodiment provides a compressor oil return control method, which can be applied to inverter air conditioners.

[0054] Figure 1 This is a flowchart of the compressor oil return control method provided in Embodiment 1 of the present invention, as follows: Figure 1 As shown, the method includes the following steps:

[0055] S101: When the return oil entry conditions are met, obtain the outdoor ambient temperature.

[0056] S102, determine the oil return frequency and oil return time based on the temperature range of the outdoor environment.

[0057] S103 adjusts the current oil return frequency based on the condensation temperature and the outdoor ambient temperature during the oil return process.

[0058] S104, when the return oil time is reached, the return oil is discontinued.

[0059] Inverter air conditioners typically set different initial compressor operating frequencies based on varying outdoor ambient temperatures. Furthermore, the compressor frequency and oil return rate constantly change during operation. Therefore, the operating frequency and required oil return volume differ depending on the outdoor ambient temperature. This embodiment pre-tests different oil return frequencies and times based on varying outdoor ambient temperature ranges to achieve a match between the oil return volume and operating conditions.

[0060] This embodiment determines the oil return frequency and time based on the outdoor ambient temperature. During the oil return process, the current oil return frequency is adjusted according to the condensing temperature and the outdoor ambient temperature. When the oil return time is reached, the oil return process ends. By adopting an oil return frequency and time matched to the current operating conditions under different ambient temperatures, the oil return volume can be adjusted according to different outdoor ambient temperatures. Furthermore, by combining the actual operation of the air conditioner and appropriately adjusting the oil return frequency based on the condensing temperature and the outdoor ambient temperature, the most suitable oil return frequency can be selected, ensuring an appropriate oil return volume, saving energy, and adapting well to different operating conditions. This solves the problem of poor adaptability under different operating conditions when the compressor uses a fixed oil return frequency and time, resulting in more intelligent control.

[0061] In one embodiment, determining the oil return frequency and oil return time based on the temperature range of the outdoor ambient temperature includes: determining the temperature range of the outdoor ambient temperature; and determining the oil return frequency and oil return time corresponding to the temperature range based on pre-stored information.

[0062] The system pre-stores the correspondence between temperature range, oil return frequency, and oil return time. This correspondence applies to all air conditioners of different models within the same series. For example, air conditioners of the same series but with different heat exchange rates and / or different heat exchangers can use the same correspondence. In practice, the correspondence can be determined based on empirical values ​​or by selecting a representative air conditioner from the same series for testing. This correspondence is applicable to multiple air conditioner models, possessing a certain degree of universality, eliminating the need for extensive experiments for each model.

[0063] This implementation method sets different oil return frequencies and times according to different outdoor ambient temperature ranges. It can adjust the oil return volume according to different outdoor ambient temperatures, ensuring that the oil return frequency and time of the air conditioner are within a suitable range under different loads. Moreover, the pre-stored correspondence between temperature range, oil return frequency and oil return time has a certain degree of universality, which can reduce experimental testing time and greatly shorten the research and development cycle.

[0064] Specifically, the return oil frequency and return oil time corresponding to the temperature range are determined based on pre-stored information, including:

[0065] If the outdoor ambient temperature is less than or equal to the first preset temperature and remains so for the first preset time, then the return oil frequency is determined to be the first frequency and the return oil time is determined to be the first time.

[0066] If the outdoor ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, and continues for the second preset time, then the return oil frequency is determined to be the second frequency and the return oil time is determined to be the second time.

[0067] If the outdoor ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, and this continues for the second preset time, then the return oil frequency is determined to be the third frequency and the return oil time is determined to be the third time.

[0068] If the outdoor ambient temperature is greater than the third preset temperature and continues for the first preset time, then the return oil frequency is determined to be the fourth frequency and the return oil time is determined to be the fourth time.

[0069] Among them, the fourth frequency < the first frequency < the third frequency < the second frequency, and the first time = the third time < the second time < the fourth time.

[0070] The first preset temperature, second preset temperature, third preset temperature, first preset time, and second preset time can all be set according to actual conditions. First preset temperature < Second preset temperature < Third preset temperature. The first preset time and second preset time can be equal. However, considering the lower oil return volume required under low-temperature and ultra-high-temperature conditions, the first preset time can be longer than the second preset time to delay the start of oil return and reduce the amount of oil returned under these conditions.

[0071] This implementation method uses different outdoor ambient temperature ranges to correspond to different oil return frequencies and times. It can adjust the oil return volume according to different outdoor ambient temperatures, ensuring that the oil return frequency and time of the air conditioner are within a suitable range under different loads. While ensuring the oil return volume, it minimizes unnecessary compressor power and power consumption.

[0072] In one embodiment, the current oil return frequency is adjusted based on the condensation temperature and the outdoor ambient temperature, including: periodically acquiring the current condensation temperature and calculating the difference between the current condensation temperature and the outdoor ambient temperature; if the difference is less than the lower limit of a preset temperature range, it indicates that the current oil return frequency is too low, and the oil return frequency is increased; if the difference is greater than the upper limit of the preset temperature range, it indicates that the current oil return frequency is too high, and the oil return frequency is decreased.

[0073] The preset temperature range can be set according to actual conditions, for example, the preset temperature range can be set to 10℃~20℃. In practical applications, the oil return frequency can be adjusted according to preset amplitudes, for example, the oil return frequency can be increased or decreased in 3Hz increments.

[0074] This implementation takes into account the limitations of determining the oil return frequency solely based on outdoor ambient temperature, as the oil return frequency is mostly based on empirical data or experimental tests. Therefore, after determining the corresponding oil return frequency based on outdoor ambient temperature, it is further judged whether the oil return frequency is reasonable and adjusted accordingly. This can dynamically adjust the oil return frequency to prevent system protection during the oil return process, while also ensuring an appropriate amount of oil return, reducing compressor power and power consumption, and avoiding unnecessary waste.

[0075] Furthermore, after calculating the difference between the current condensing temperature and the outdoor ambient temperature, the method further includes: if the difference is within a preset temperature range (i.e., the difference is greater than or equal to the lower limit and less than or equal to the upper limit), then obtaining the current suction temperature and the current evaporation temperature; calculating the difference between the suction temperature and the evaporation temperature; if the difference between the suction temperature and the evaporation temperature is less than a preset threshold, indicating a risk of liquid slugging, then reducing the opening of the electronic expansion valve between the evaporator and the condenser; if the difference between the suction temperature and the evaporation temperature is greater than or equal to the preset threshold, then controlling the air conditioner to maintain its current operating state.

[0076] The preset threshold can be set according to the actual situation. For example, the preset threshold can be set to 4℃.

[0077] This implementation method can prevent liquid slugging, avoid compressor damage, and protect the compressor.

[0078] In one implementation, if any of the following conditions are detected before acquiring the outdoor ambient temperature, it is determined that the oil return entry condition is met:

[0079] After startup, the compressor's cumulative running time reaches the third preset time;

[0080] After the last oil return cycle was completed, the compressor's cumulative running time reached the fourth preset time.

[0081] After the last oil return cycle is completed, the compressor's cumulative running time reaches the cumulative time corresponding to the current outdoor ambient temperature.

[0082] The third and fourth preset times can be set according to actual conditions; for example, the third preset time can be set to 2 hours and the fourth preset time to 8 hours. The correspondence between outdoor ambient temperature and cumulative time can be obtained and stored in advance through experiments.

[0083] This implementation method can reasonably control the air conditioning system's return oil flow.

[0084] In addition, when entering the oil return phase, the electronic expansion valve between the evaporator and condenser can be adjusted to the greater of the initial step number corresponding to the current outdoor ambient temperature and the current step number to avoid high-pressure protection. When exiting the oil return phase, the electronic expansion valve is adjusted to the initial step number corresponding to the current outdoor ambient temperature. After a certain period of time (e.g., 2 minutes), the compressor is controlled to return to the frequency before the oil return phase and the air conditioner is controlled to operate according to normal control logic.

[0085] Example 2

[0086] The compressor oil return control method described above will be illustrated below with reference to a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustration of this application and does not constitute an undue limitation of this application. The same or corresponding terminology used in the above embodiment will not be repeated in this embodiment.

[0087] like Figure 2 The diagram shows the structure of an air conditioner, which includes: a compressor 1, a condenser 2, an electronic expansion valve 3, an evaporator 4, a condenser fan 5, an evaporator fan 6, an electric heater 7, an exhaust pressure detection device 8, and an intake pressure detection device 9. An exhaust temperature sensor is installed at the exhaust port of the compressor 1, and an intake temperature sensor is installed at the intake port of the compressor 1.

[0088] The condensation temperature can be calculated by detecting the exhaust pressure, and the evaporation temperature can be calculated by detecting the intake pressure. Alternatively, the condensation and evaporation temperatures can be directly detected using relevant temperature sensors.

[0089] The following explanation uses the cooling mode as an example to illustrate the oil return control.

[0090] 1. Conditions for oil return entry:

[0091] When the air conditioner detects any of the following conditions, it will initiate an oil return operation to recover lubricating oil from the corresponding pipeline:

[0092] (1) After the air conditioner is powered on, the compressor runs for a total of 2 hours.

[0093] (2) The compressor has accumulated 8 hours of operation since the last oil return cycle was completed;

[0094] (3) The cumulative running time of the compressor after the last oil return operation has reached the cumulative time corresponding to the current external ambient temperature range.

[0095] When the unit switches modes, the compressor running time is not recalculated; the compressor continues to accumulate running time the next time it enters cooling or dehumidification mode. Oil return is not performed during compressor initialization. When anti-freeze protection frequency reduction occurs, oil return is not initiated, and the compressor's accumulated running time is not reset to zero.

[0096] 2. Oil return operation process:

[0097] (1) When the duration of the outdoor ambient temperature T being less than or equal to the first preset temperature T1 reaches time t1 (equivalent to the first preset time mentioned above), the compressor enters the oil return operation, the oil return frequency is f1, and the oil return time for each operation is t2 (equivalent to the first frequency and first time mentioned above).

[0098] (2) When the duration of the outdoor ambient temperature T being greater than the first preset temperature T1 and less than or equal to the second preset temperature T2 reaches time t3 (equivalent to the second preset time mentioned above), the compressor enters the oil return operation, the oil return frequency is f2, and the oil return time for each operation is t4 (equivalent to the second frequency and second time mentioned above).

[0099] (3) When the duration of the outdoor ambient temperature T being greater than the second preset temperature T2 and less than or equal to the third preset temperature T3 reaches time t3, the compressor enters the oil return operation with an oil return frequency of f3 and an oil return time of t5 (equivalent to the third frequency and third time mentioned above).

[0100] (4) When the outdoor ambient temperature T is greater than the third preset temperature T3 for a duration of t1, the compressor enters the oil return operation, the oil return frequency is f4, and the oil return time is t6 (equivalent to the fourth frequency and fourth time mentioned above).

[0101] Where T1 < T2 < T3, for example, T1 = 25℃, T2 = 45℃, T3 = 60℃. f4 < f1 < f3 < f2, for example, f1 = 50–60Hz, f2 = 60–70Hz, f3 = 55–60Hz, f4 = 40–45Hz. t1 > t3, for example, t1 = 5–6h, t3 = 4–5h. t2 = t5 < t4 < t6, for example, t2 = 3–4min, t4 = 4–5min, t5 = 3–4min, t6 = 6–8min.

[0102] Experimental verification revealed that at low ambient temperatures (above 0℃ for low-temperature refrigeration), the compressor operates at a low frequency, and the compressor load and speed are small, resulting in minimal wear on the compressor housing. Frequent oil return for lubrication is unnecessary, and the number of oil return cycles can be appropriately reduced during low-frequency operation, with a frequency reduction method employed for oil return. Under rated operating conditions, the unit operates at a higher frequency, resulting in a larger oil discharge rate, necessitating oil return at a higher frequency. The oil return operation time is slightly longer than at low ambient temperatures. Under ultra-high temperature conditions, the air conditioning unit operates at a much lower frequency than under rated conditions, resulting in a smaller refrigerant flow rate, smaller oil discharge, and a smaller required oil return volume. Therefore, the oil return frequency can be appropriately reduced, while the oil return time can be increased.

[0103] Cases (1) and (4) require less oil return, t1 > t3, which allows the compressor to start oil return later, reducing the amount of oil return in cases (1) and (4). Case (4) corresponds to the ultra-high temperature condition, where the compressor operating frequency is lower than that in case (1). If the oil return frequency in case (4) is high, it will lead to an increase in discharge pressure, which may cause high pressure protection. Therefore, f4 < f1. Considering the reduced oil return frequency in case (4), the corresponding oil return time is longer, which can provide a certain margin for the amount of oil return. The unit operates in the temperature range of case (2) most of the time, and the external ambient temperature corresponding to case (2) is lower than that corresponding to case (3), t4 > t5. Appropriately increasing the oil return time can ensure sufficient oil return.

[0104] After determining the oil return frequency and time based on the outdoor ambient temperature, oil return can begin. Increase the compressor frequency to the determined oil return frequency, and open the electronic expansion valve to the greater of the initial step number and the current step number corresponding to the current outdoor ambient temperature.

[0105] Considering the limitations of determining the oil return frequency solely based on outdoor ambient temperature, and that this frequency is largely derived from empirical data or experimental tests, this embodiment further includes the following steps to make the control method more universal, adaptable to air conditioners with different heat exchange configurations, and to further determine whether the determined oil return frequency is reasonable:

[0106] After determining the corresponding oil return frequency based on the outdoor ambient temperature, the current condensation temperature is detected, and the condensation temperature T is calculated. 冷凝 The difference between the outdoor temperature and the ambient temperature T. When T 冷凝 When -T < △T1, it indicates that the current return oil frequency is too low and needs to be increased, specifically in increments of 3Hz. When T 冷凝 When -T > △T2, it indicates that the current oil return frequency is too high and needs to be reduced, specifically in 3Hz increments. This allows for dynamic adjustment of the oil return frequency, preventing system protection during the oil return process, while also ensuring an appropriate oil return volume, reducing compressor power and energy consumption, and avoiding unnecessary waste. △T1 corresponds to the lower limit of the preset temperature range, and △T2 corresponds to the upper limit of the preset temperature range; [△T1, △T2] constitutes the preset temperature range. For example, the current condensing temperature can be checked every 30 seconds, and adjustments can be made accordingly to the oil return frequency until the oil return process ends.

[0107] When T 冷凝 When -T is within the range of [△T1, △T2], the evaporation temperature T is detected. 蒸发 and intake temperature T 吸气 Then calculate T 吸气 -T 蒸发 If T吸气 -T 蒸发 If the temperature is below 4℃, there is a risk of liquid slugging. In this case, the electronic expansion valve should be partially closed to protect the compressor. If T 吸气 -T 蒸发 If the temperature is ≥4℃, the air conditioner will maintain its current operating status.

[0108] During the oil return operation or preparation for oil return operation in any system, the compressor of the corresponding system does not stop.

[0109] If a protection mechanism or malfunction occurs during the oil return process, the oil return will end prematurely, the oil return running time will be reset to zero, and the compressor's cumulative running time will not be reset to zero.

[0110] 3. Oil return ends:

[0111] When the oil return operation time reaches the oil return time determined based on the outdoor ambient temperature, the oil return is stopped. The electronic expansion valve is opened to the initial step number corresponding to the current outdoor ambient temperature and maintained for 2 minutes. Then, the compressor resumes the frequency before the oil return, the outdoor fan adjusts automatically, the oil return mark is cleared, the oil return timer is cleared, and the air conditioner is controlled according to the normal control logic.

[0112] like Figure 3 The diagram shown illustrates the relationship between different outdoor ambient temperatures and compressor oil return frequency, including the following steps:

[0113] S301, detects the outdoor ambient temperature T.

[0114] S302, determine that T≤T1.

[0115] S303, determine whether the duration t of T≤T1 satisfies t≥t1. If yes, proceed to S304; otherwise, return to S301.

[0116] S304, enter the return oil mode, the return oil frequency is f1, and the return oil time is t2.

[0117] S305, determine T1<T≤T2.

[0118] S306, determine whether the duration t of T1<T≤T2 satisfies t≥t3. If yes, proceed to S307; otherwise, return to S301.

[0119] S307, enter the return oil mode, the return oil frequency is f2, and the return oil time is t4.

[0120] S308, determine T2<T≤T3.

[0121] S309, determine whether the duration t of T2<T≤T3 satisfies t≥t3. If yes, proceed to S310; otherwise, return to S301.

[0122] S310, enter the return oil mode, the return oil frequency is f3, and the return oil time is t5.

[0123] S311, determine that T > T3.

[0124] S312, determine whether the duration t of T > T3 satisfies t ≥ t1. If yes, proceed to S313; otherwise, return to S301.

[0125] S313, enter the return oil mode, the return oil frequency is f4, and the return oil time is t6.

[0126] like Figure 4 The diagram shown is a flow chart for the oil return control, which includes the following steps:

[0127] S401 determines the oil return frequency and oil return time based on the outdoor ambient temperature.

[0128] S402, determine whether T is satisfied. 冷凝 If -T is within the preset temperature range, proceed to S404; otherwise, proceed to S403.

[0129] S403, increases or decreases the return oil frequency in 3Hz increments.

[0130] S404, determine whether T is satisfied. 吸气 -T 蒸发 <4℃, if yes, proceed to S405, if no, proceed to S406.

[0131] S405, reduce the opening of the electronic expansion valve.

[0132] S406, the air conditioner will continue to operate in its current state.

[0133] In summary, this embodiment adopts an oil return frequency and time that match the current operating conditions under different ambient temperatures. It can adjust the oil return volume according to different outdoor ambient temperatures. Furthermore, based on the actual operation of the air conditioner, the oil return frequency can be appropriately adjusted according to the condensing temperature and the outdoor ambient temperature. This allows for the selection of the most suitable oil return frequency, ensuring an appropriate oil return volume, saving energy, and adapting well to different operating conditions. It solves the problem that compressors using fixed oil return frequencies and times have poor adaptability under different operating conditions, resulting in more intelligent control.

[0134] Example 3

[0135] Based on the same inventive concept, this embodiment provides a compressor oil return control device, which can be used to implement the compressor oil return control method described in the above embodiments. This compressor oil return control device can be implemented through software and / or hardware, and is generally integrated into the air conditioner controller.

[0136] Figure 5 This is a structural block diagram of the compressor oil return control device provided in Embodiment 3 of the present invention, as shown below. Figure 5 As shown, the device includes:

[0137] The acquisition module 51 is used to acquire the outdoor ambient temperature when the return oil entry condition is met.

[0138] The determining module 52 is used to determine the oil return frequency and oil return time based on the temperature range of the outdoor ambient temperature.

[0139] The adjustment module 53 is used to adjust the current oil return frequency according to the condensation temperature and the outdoor ambient temperature during the oil return process;

[0140] The exit module 54 is used to exit the oil return process when the oil return time is reached.

[0141] Optionally, the determining module 52 includes:

[0142] The first determining unit is used to determine the temperature range of the outdoor ambient temperature.

[0143] The second determining unit is used to determine the oil return frequency and oil return time corresponding to the temperature range based on the pre-stored information.

[0144] The system pre-stores the correspondence between temperature range, oil return frequency, and oil return time, and this correspondence applies to all air conditioners of different models within the same series.

[0145] Optionally, the second determining unit is specifically used for:

[0146] If the outdoor ambient temperature is less than or equal to the first preset temperature and remains so for the first preset time, then the return oil frequency is determined to be the first frequency and the return oil time is determined to be the first time.

[0147] If the outdoor ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, and continues for the second preset time, then the return oil frequency is determined to be the second frequency and the return oil time is determined to be the second time.

[0148] If the outdoor ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, and this temperature persists for the second preset time, then the return oil frequency is determined to be the third frequency and the return oil time is determined to be the third time.

[0149] If the outdoor ambient temperature is greater than the third preset temperature and continues for the first preset time, then the return oil frequency is determined to be the fourth frequency and the return oil time is determined to be the fourth time.

[0150] Among them, the fourth frequency < the first frequency < the third frequency < the second frequency, and the first time = the third time < the second time < the fourth time.

[0151] Optionally, adjustment module 53 includes:

[0152] A calculation unit is used to periodically acquire the current condensation temperature and calculate the difference between the current condensation temperature and the outdoor ambient temperature.

[0153] An enhancement unit is used to increase the oil return frequency if the difference is less than the lower limit of a preset temperature range.

[0154] The reducing unit is used to reduce the oil return frequency if the difference is greater than the upper limit of the preset temperature range.

[0155] Optionally, the above-mentioned device further includes:

[0156] The temperature acquisition module is used to calculate the difference between the current condensation temperature and the outdoor ambient temperature, and if the difference is within the preset temperature range, then acquire the current intake temperature and the current evaporation temperature.

[0157] A calculation module is used to calculate the difference between the intake temperature and the evaporation temperature;

[0158] The control module is used to reduce the opening of the electronic expansion valve between the evaporator and the condenser if the difference between the intake temperature and the evaporation temperature is less than a preset threshold.

[0159] Optionally, the above-mentioned device further includes:

[0160] The detection module determines that the return oil entry condition is met if it detects any of the following conditions before acquiring the outdoor ambient temperature:

[0161] After startup, the compressor's cumulative running time reaches the third preset time;

[0162] After the last oil return cycle was completed, the compressor's cumulative running time reached the fourth preset time.

[0163] After the last oil return cycle is completed, the compressor's cumulative running time reaches the cumulative time corresponding to the current outdoor ambient temperature.

[0164] The aforementioned compressor oil return control device can execute the compressor oil return control method provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects of the method. Technical details not described in detail in this embodiment can be found in the compressor oil return control method provided in the embodiments of the present invention.

[0165] Example 4

[0166] This embodiment provides an air conditioner, including: the compressor oil return control device described in this embodiment. The air conditioner in this embodiment is an inverter air conditioner.

[0167] Example 5

[0168] This embodiment provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the method described in this embodiment of the invention.

[0169] Example 6

[0170] This embodiment provides a non-volatile computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the method described in this embodiment of the invention.

[0171] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0172] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment 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, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; 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; and these 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 compressor oil return control method characterized by, include: When the return oil entry conditions are met, the outdoor ambient temperature is obtained; Different oil return frequencies and oil return times are determined based on the different temperature ranges of the outdoor ambient temperature. During the oil return process, the current oil return frequency is adjusted according to the condensation temperature and the outdoor ambient temperature. When the specified return oil time is reached, the return oil supply is discontinued. The current oil return frequency is adjusted based on the condensation temperature and the outdoor ambient temperature, including: The current condensation temperature is periodically acquired, and the difference between the current condensation temperature and the outdoor ambient temperature is calculated. If the difference is less than the lower limit of the preset temperature range, the oil return frequency is increased; If the difference is greater than the upper limit of the preset temperature range, the oil return frequency is reduced.

2. The method of claim 1, wherein, Based on the outdoor ambient temperature range, determine the oil return frequency and oil return time, including: Determine the temperature range within which the outdoor ambient temperature falls; The oil return frequency and oil return time corresponding to the temperature range are determined based on the pre-stored information. The system pre-stores the correspondence between temperature range, oil return frequency, and oil return time, and this correspondence applies to all air conditioners of different models within the same series.

3. The method of claim 2, wherein, Determining the oil return frequency and oil return time corresponding to the temperature range based on pre-stored information includes: If the outdoor ambient temperature is less than or equal to the first preset temperature and remains so for the first preset time, then the return oil frequency is determined to be the first frequency and the return oil time is determined to be the first time. If the outdoor ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, and continues for the second preset time, then the return oil frequency is determined to be the second frequency and the return oil time is determined to be the second time. If the outdoor ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, and this temperature persists for the second preset time, then the return oil frequency is determined to be the third frequency and the return oil time is determined to be the third time. If the outdoor ambient temperature is greater than the third preset temperature and continues for the first preset time, then the return oil frequency is determined to be the fourth frequency and the return oil time is determined to be the fourth time. Among them, the fourth frequency < the first frequency < the third frequency < the second frequency, and the first time = the third time < the second time < the fourth time.

4. The method of claim 1, wherein, After calculating the difference between the current condensation temperature and the outdoor ambient temperature, the method also includes: If the difference is within the preset temperature range, then obtain the current intake temperature and the current evaporation temperature; Calculate the difference between the intake temperature and the evaporation temperature; If the difference between the intake temperature and the evaporation temperature is less than a preset threshold, the opening of the electronic expansion valve between the evaporator and the condenser is reduced.

5. The method according to any one of claims 1 to 4, characterized in that, If any of the following conditions are detected before obtaining the outdoor ambient temperature, the return oil entry condition is determined to be met: After startup, the compressor's cumulative running time reaches the third preset time; After the last oil return cycle was completed, the compressor's cumulative running time reached the fourth preset time. After the last oil return cycle is completed, the compressor's cumulative running time reaches the cumulative time corresponding to the current outdoor ambient temperature.

6. A compressor oil return control device, characterized in that, include: The acquisition module is used to acquire the outdoor ambient temperature when the return oil entry conditions are met. The determination module is used to determine the oil return frequency and oil return time based on the temperature range of the outdoor ambient temperature. The adjustment module is used to adjust the current oil return frequency during the oil return process based on the condensation temperature and the outdoor ambient temperature. The exit module is used to exit the oil return process when the oil return time is reached. The adjustment module is used to periodically acquire the current condensation temperature and calculate the difference between the current condensation temperature and the outdoor ambient temperature. If the difference is less than the lower limit of the preset temperature range, the oil return frequency is increased; if the difference is greater than the upper limit of the preset temperature range, the oil return frequency is decreased.

7. An air conditioner characterized by comprising: include: The compressor oil return control device according to claim 6.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method according to any one of claims 1 to 5.

9. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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