Compressor oil return method and device, computer equipment and storage medium

Abstract

The invention relates to the technical field of vehicles, and discloses a compressor oil return method and device, computer equipment and a storage medium, and the compressor oil return method comprises the following steps: if the working mode of a compressor is a single-area air conditioner starting mode, calculating the oil retention rate of the compressor according to the temperature difference of a front shell and a rear shell of the compressor and the superheat degree of an evaporator outlet; acquiring an oil return strategy corresponding to the oil retention rate; and controlling oil films accumulated at the evaporator and the front end of the evaporator to flow back to the compressor according to the oil return strategy. The oil return rate of the compressor is increased, the problems of compressor abrasion and performance reduction caused by lack of lubricating oil are effectively prevented, the service life of the compressor is prolonged, and meanwhile the overall performance and stability of the vehicle air conditioning system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a compressor oil return method and device, computer equipment and a storage medium. BACKGROUND

[0002] In a vehicle air conditioning system, the compressor is a core component, and its interior needs to be lubricated and sealed by lubricating oil. When the air conditioning system is running, part of the lubricating oil will enter the system circulation pipeline together with the refrigerant. When the air conditioning system is in a low load working condition, the lubricating oil return rate of the compressor is affected due to the reduction of the flow rate of the refrigerant. SUMMARY

[0003] Therefore, the present application provides a compressor oil return method and device, computer equipment and a storage medium.

[0004] In a first aspect, the present application provides a compressor oil return method, comprising: if the working mode of the compressor is a single-zone air conditioner opening mode, calculating the oil retention rate of the compressor according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet; obtaining an oil return strategy corresponding to the oil retention rate; and controlling the oil film accumulated in the evaporator and the front end of the evaporator to flow back to the compressor according to the oil return strategy.

[0005] The compressor oil return method provided by the present application can accurately calculate the oil retention rate according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet by real-time monitoring the working mode of the compressor, such as the single-zone air conditioner opening mode. The corresponding oil return strategy is obtained through the calculated oil retention rate, and the oil film is returned to the compressor from the evaporator and its front end, which not only improves the oil return efficiency, but also effectively prevents the problems of compressor wear and performance decline caused by insufficient lubricating oil, prolongs the service life of the compressor, and improves the overall performance and stability of the vehicle air conditioning system.

[0006] In combination with the first aspect, in an embodiment, the oil retention rate of the compressor is calculated according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet, comprising: determining whether there is oil film accumulation in the interior of the compressor according to the temperature difference between the front and rear shells of the compressor; if there is oil film accumulation in the interior of the compressor, and the superheat degree of the evaporator outlet is less than a superheat degree threshold, calculating the oil retention rate of the compressor according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet.

[0007] The compressor oil return method provided by the embodiment of the present application can more accurately determine whether oil film accumulation occurs in the compressor, and only when the oil film accumulation exists and the evaporator outlet superheat is low, the oil retention rate is calculated, thereby improving the pertinence of calculation, reducing unnecessary calculation process, further ensuring the accuracy and effectiveness of the oil return strategy, reducing unnecessary energy waste, improving the accuracy and response speed of the oil return control, and further improving the operation efficiency and stability of the compressor.

[0008] In combination with the first aspect, in an implementation mode, the oil return strategy corresponding to the oil retention rate is obtained, including: determining an oil retention range corresponding to the oil retention rate; obtaining a corresponding relationship between the oil retention range and the oil return strategy, wherein the corresponding relationship includes at least one oil return strategy associated with the oil retention range; and determining the oil return strategy matched with the current oil retention rate according to the corresponding relationship.

[0009] The compressor oil return method provided by the embodiment of the present application can take corresponding oil return measures according to different oil retention conditions, thereby improving the flexibility of the oil return operation and ensuring the accuracy and efficiency of the oil return process.

[0010] In combination with the first aspect, in an implementation mode, the oil film accumulated in the evaporator and the front end of the evaporator is controlled to return to the compressor according to the oil return strategy, including: if the oil return strategy is a first strategy, the compressor is controlled to perform start-stop operation according to a first period, and the pressure difference on both sides of the electronic expansion valve located at the front end of the evaporator is adjusted during the shutdown period, the oil retention range corresponding to the first strategy is a first retention range; the oil film accumulated in the evaporator and the front end of the evaporator is driven to return to the compressor through the Venturi section arranged at the front end of the compressor by using the pressure difference formed on both sides of the electronic expansion valve, the throat diameter of the Venturi section is 0.6 times the pipe diameter of the compressor oil return pipeline, and the inner wall of the throat is provided with a spiral guide groove, the spiral guide groove is used to guide the oil film to flow spirally along the inner wall of the throat to avoid the oil film from being accumulated and blocked in the throat.

[0011] The compressor oil return method provided by the embodiment of the present application further improves the oil return efficiency and accuracy by taking the corresponding oil return strategy according to the different oil retention ranges, and realizes the fine control of the oil return process by controlling the start-stop operation of the compressor and adjusting the pressure difference on both sides of the electronic expansion valve, which is conducive to prolonging the service life of the compressor and improving the stability and reliability of the entire refrigeration system.

[0012] In combination with the first aspect, in an implementation manner, according to the oil return strategy, the oil film accumulated in the evaporator and the front end of the evaporator is controlled to return to the compressor, and the method further comprises: if the oil return strategy is the second strategy, the rotating speed of the compressor is increased to the first target rotating speed in the second period during the operation of the compressor and is maintained for the first time length, the oil retention range corresponding to the second strategy is the second retention range, the second retention range is greater than the first retention range, and the second period is less than the first period; the oil film accumulated in the evaporator and the front end of the evaporator is driven to return to the compressor through the Venturi section arranged at the front end of the compressor by using the first target rotating speed of the compressor, the throat diameter of the Venturi section is 0.6 times the pipe diameter of the compressor oil return pipeline, and the inner wall of the throat is provided with a spiral guide groove, the spiral guide groove is used to guide the oil film to flow spirally along the inner wall of the throat to avoid the oil film from being accumulated and blocked in the throat.

[0013] The compressor oil return method provided by the embodiment of the present application can generate stronger suction force by temporarily increasing the rotating speed of the compressor to the first target rotating speed in the second period during the operation of the compressor and maintaining the rotating speed for a period of time, effectively pulls and returns the oil film in the evaporator and the front end of the evaporator to the compressor, improves the oil return speed, reduces the risk of oil deterioration and deposition by reducing the retention time of the oil in the evaporator and the front end of the evaporator, and further maintains the healthy operation state of the compressor.

[0014] In combination with the first aspect, in an implementation manner, the method further comprises: if the working mode of the compressor is the battery cooling separate opening mode, the rotating speed of the compressor is increased to the second target rotating speed in the second time length in the third period, and the third period is greater than the first period; and the oil film accumulated in the evaporator and the front end of the evaporator is driven to return to the compressor by using the second target rotating speed of the compressor.

[0015] The compressor oil return method provided by the embodiment of the present application can ensure that the battery cooling system can obtain stable and sufficient cooling power by gradually increasing the rotating speed of the compressor to the second target rotating speed in a longer time interval and maintaining the rotating speed for a second time length, and reduce the additional wear and energy consumption of the compressor caused by frequent and rapid adjustment of the rotating speed.

[0016] In combination with the first aspect, in an implementation manner, the method further comprises: querying a historical database to obtain the historical oil return record closest to the current time, and obtaining the historical oil retention rate and the historical oil return strategy from the historical oil return record; comparing the oil retention rate with the historical oil retention rate to obtain the oil retention rate change trend; comparing the oil return strategy with the historical oil return strategy to obtain the oil return adjustment direction; analyzing the obtained oil retention rate change trend and oil return adjustment direction to obtain the potential problem existing in the compressor, and pushing the corresponding operation optimization information based on the potential problem.

[0017] The compressor oil return method provided by the embodiment of the present application can quickly locate the difference between the current oil return operation and the historical operation by querying the historical database and combining the oil retention rate and the oil return strategy in the historical oil return record, and then determine whether the oil return strategy needs to be adjusted to optimize the operation of the compressor. Through comprehensive analysis of the change trend of the oil retention rate and the oil return adjustment direction, the potential problems that may exist in the compressor can be accurately identified and the corresponding operation optimization information can be pushed to ensure the stable operation and high efficiency of the compressor.

[0018] In a second aspect, the embodiment of the present application provides a compressor oil return device, comprising: a retention rate calculation module, configured to calculate the oil retention rate of the compressor according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet if the working mode of the compressor is a single-zone air conditioner start mode; a strategy acquisition module, configured to acquire the oil return strategy corresponding to the oil retention rate; and an oil return control module, configured to control the oil film accumulated in the evaporator and the front end of the evaporator to flow back to the compressor according to the oil return strategy.

[0019] In a third aspect, the embodiment of the present application provides a computer device, comprising: a memory and a processor, which are in communication connection with each other, and the memory stores computer instructions; the processor executes the computer instructions to perform the compressor oil return method of the first aspect or any of the corresponding embodiments thereof.

[0020] In a fourth aspect, the embodiment of the present application provides a computer readable storage medium, which stores computer instructions, and the computer instructions are used to make the computer execute the compressor oil return method of the first aspect or any of the corresponding embodiments thereof.

[0021] In a fifth aspect, the embodiment of the present application provides a computer program product, which comprises computer instructions, and the computer instructions are used to make the computer execute the compressor oil return method of the first aspect or any of the corresponding embodiments thereof. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0023] Figure 1 is a flowchart of the compressor oil return method according to some embodiments of the present application;

[0024] Figure 2is a flowchart of another compressor oil return method according to some embodiments of the present application;

[0025] Figure 3 is a schematic diagram of a compressor oil return principle according to some embodiments of the present application;

[0026] Figure 4 is a schematic diagram of a Venturi section according to some embodiments of the present application;

[0027] Figure 5 is a structural block diagram of a compressor oil return device according to an embodiment of the present application;

[0028] Figure 6 is a hardware structure schematic diagram of a computer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] According to an embodiment of the present application, a compressor oil return method embodiment is provided. It should be noted that the steps shown in the flowchart of 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 herein can be executed in an order different from that shown herein.

[0031] In the present embodiment, a compressor oil return method is provided, Figure 1 is a flowchart of a compressor oil return method according to an embodiment of the present application, as Figure 1 shown, the flow includes the following steps:

[0032] Step S101, if the working mode of the compressor is a single zone air conditioner start mode, the oil retention rate of the compressor is calculated according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet.

[0033] Wherein, the single zone air conditioner start mode refers to the running state of the compressor providing service for only a single air conditioning area.

[0034] Specifically, if the working mode of the compressor is a single-zone air conditioner opening mode, the front shell temperature of the compressor is obtained through a front shell temperature sensor arranged on the front shell of the compressor (i.e., the shell of the compressor close to the scroll plate side), and the rear shell temperature of the compressor is obtained through a rear shell temperature sensor arranged on the rear shell of the compressor (i.e., the shell of the compressor close to the motor). According to the front shell temperature of the compressor and the rear shell temperature of the compressor, the temperature difference between the front and rear shells of the compressor is calculated. At the same time, the superheat degree of the evaporator outlet is obtained through a superheat degree sensor arranged at the evaporator outlet. According to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet, the retention condition of the lubricating oil inside the compressor can be determined. When the temperature difference between the front and rear shells of the compressor is large and the superheat degree of the evaporator outlet is low, it often means that there is oil film accumulation inside the compressor, and at this time, oil return measures need to be taken in time to prevent the compressor from being damaged due to insufficient lubricating oil.

[0035] As an example, when the temperature difference between the front and rear shells of the compressor is greater than a preset temperature difference threshold (for example, 5℃) and the superheat degree of the evaporator outlet is less than a preset superheat degree threshold (for example, 3℃), it is determined that there is oil film accumulation inside the compressor. At this time, according to the temperature difference value ΔT of the front and rear shells of the compressor, the temperature difference weight coefficient α (the value range is 0.2-0.5), the difference ΔSH between the actual superheat degree and the target superheat degree of the evaporator outlet, and the superheat degree deviation weight coefficient β (the value range is 0.3-0.8), the oil retention rate of the compressor is calculated, and the formula is expressed as: oil retention rate = (α × ΔT) + (β × ΔSH).

[0036] In addition, when the continuous running time of the compressor exceeds a preset threshold (such as 8 hours) and the oil retention rate is continuously detected three times, all of which are lower than a low retention threshold (such as 10), an automatic lubricating oil supplement reminder signal is generated and associated to the equipment maintenance system to prevent abnormal wear of the compressor caused by insufficient oil.

[0037] In step S102, the oil return strategy corresponding to the oil retention rate is obtained.

[0038] Specifically, when the oil return strategy corresponding to the oil retention rate is obtained, the preset oil return strategy mapping table can be queried according to the real-time value of the oil retention rate, and the mapping table defines the oil return operation corresponding to different oil retention rate ranges (such as lower than 10 for low retention risk, 10-30 for medium retention risk, and higher than 30 for high retention risk), including adjusting the running frequency of the compressor, opening the auxiliary oil return valve, or triggering the periodic oil return cycle; at the same time, combined with the current running state of the compressor and the environmental parameters (such as the evaporator outlet temperature), the execution time and intensity of the oil return strategy are dynamically optimized to ensure that the oil return mechanism is activated in time when the oil retention rate is abnormal, and the reliability and energy efficiency of the compressor are improved.

[0039] As an example, when the oil retention rate is detected as 18 (belonging to the medium retention risk range of 10%~30%), the preset oil return strategy mapping table is queried, and the corresponding strategy is obtained: adjusting the compressor operating frequency to 120% of the rated frequency, opening the auxiliary oil return valve for 12 seconds, and triggering the periodic oil return cycle with an interval time of 25 minutes; at the same time, in combination with the evaporator outlet temperature in the current operating state of the compressor (for example, the detected value is -3℃), the execution intensity is dynamically optimized, and the frequency adjustment amplitude is reduced to 115% to prevent the refrigerant flow rate from being abnormal due to excessive oil return in a low-temperature environment, thereby ensuring that the oil return process is smooth and efficient, reducing the mechanical stress of the compressor, and prolonging the service life of the equipment.

[0040] As another example, when the oil retention rate is detected as 5% (lower than the low retention risk range of 10%), the strategy indicated by the mapping table is: maintaining the current operating frequency of the compressor, triggering the light oil return cycle only when the compressor has been running for more than 4 hours and the oil retention rate has been continuously lower than 8, that is, temporarily increasing the compressor speed to 90% of the first target speed and maintaining for 5 seconds, and executing once every 60 minutes; at the same time, in combination with environmental parameters such as outdoor temperature higher than 30℃, the oil return opportunity is optimized to the off-peak load period to minimize energy consumption fluctuations, reduce unnecessary oil return operations, and improve the energy efficiency of the compressor.

[0041] As yet another example, when the oil retention rate is detected as 35 (higher than the high retention risk range of 30%), the corresponding strategy of the mapping table is: immediately interrupting the operation of the compressor, starting the dedicated oil return pump to operate for 8 minutes, and monitoring the oil retention rate change trend after restarting; at the same time, in combination with similar high retention events (such as the oil retention rate once reached 38) in the historical database, the oil return pump operation time is dynamically adjusted to 7 minutes, and the compressor shell temperature rise rate monitoring (threshold set to 0.8℃ / min) is added to prevent insufficient lubrication due to excessive oil return, thereby significantly reducing the risk of oil deterioration and compressor wear.

[0042] In addition, when the compressor operating mode is switched to the dual-zone air conditioning open mode, if the oil retention rate is in the medium risk range, the partitioned oil return mechanism is preferentially adopted, that is, the compressor speed is individually increased for the high-load area instead of global adjustment, and the oil return cycle is adjusted in combination with the refrigerant flow rate deviation (for example, the actual flow rate is 15% lower than the standard value) to optimize resource allocation and ensure the accuracy of the oil return of the compressor under multi-zone operation.

[0043] In step S103, the oil film accumulated in the evaporator and the front end of the evaporator is controlled to flow back to the compressor according to the oil return strategy.

[0044] Specifically, the compressor can be controlled to operate for a preset time length (e.g., 8 minutes) to drive the oil film in the refrigerant flow path to flow back along the pipeline; at the same time, the oil retention rate data is collected in real time during the backflow process, and the operation parameters (e.g., the time length is shortened to 7 minutes) of the oil return pump are dynamically adjusted in combination with the preset threshold (e.g., a high retention risk range of 30%) to monitor the temperature change of the compressor shell (the temperature rise rate threshold is set to 0.8 ℃ / min), so as to ensure efficient backflow of the oil film and prevent the risk of insufficient lubrication.

[0045] In one possible implementation, during the oil return process, the frequency and intensity of the oil return strategy can also be adjusted in combination with the working load of the compressor and the refrigeration demand. For example, when the compressor is in a high-load operating state, the frequency of the oil return operation can be appropriately increased to ensure timely backflow of the oil film in the compressor, and to prevent the compressor from overheating and energy efficiency from decreasing due to accumulation of the oil film. At the same time, during a non-peak period when the refrigeration demand is low, the number of oil return operations can be appropriately reduced to reduce energy consumption and prolong the service life of the equipment.

[0046] As an example, when the working load of the compressor reaches a preset high threshold (e.g., 80% load rate), the frequency of the oil return operation is increased from the default once every 20 minutes to once every 15 minutes, and the oil return intensity is enhanced (e.g., the compressor speed is increased by 20%) to accelerate the backflow of the oil film and prevent the compressor from overheating due to accumulation of the oil film; at the same time, by monitoring the refrigeration demand in real time (e.g., the demand is lower than 50% of the set value), the oil return frequency is reduced to once every 30 minutes during a non-peak period (e.g., at night), and the oil return time length is dynamically shortened to 6 minutes in combination with the oil retention rate data (e.g., the retention rate is lower than 20) to reduce energy consumption and prolong the service life of the compressor. In addition, during the adjustment process, the temperature change of the compressor shell is continuously collected (the temperature rise rate threshold is 0.8 ℃ / min), and if the temperature rise exceeds the threshold, the enhancement of the oil return intensity is immediately suspended to ensure lubrication safety; at the same time, based on the refrigerant flow rate deviation (e.g., the actual flow rate is lower than the standard value by 15%), the oil return period is adaptively prolonged by 10% to optimize resource allocation and air conditioning system stability.

[0047] The compressor oil return method provided by the embodiment of the present application can accurately calculate the oil retention rate according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet by monitoring the working mode of the compressor, such as the single-zone air conditioner start mode; the corresponding oil return strategy is obtained through the calculated oil retention rate, the oil film is returned from the evaporator and the front end thereof to the compressor, the oil return efficiency is improved, the problems of compressor wear and performance decline caused by insufficient lubricating oil are effectively reduced, the service life of the compressor is prolonged, and the overall performance and stability of the vehicle air conditioning system are improved.

[0048] In the embodiment, a compressor oil return method is provided, Figure 2 is a flowchart of the compressor oil return method according to the embodiment of the present application, as shown inFigure 2 As shown, the flow includes the following steps:

[0049] In step S201, if the working mode of the compressor is the single-zone air conditioner start mode, the oil retention rate of the compressor is calculated according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet.

[0050] Specifically, step S201 includes:

[0051] In step S2011, whether there is oil film accumulation in the compressor is determined according to the temperature difference between the front and rear shells of the compressor.

[0052] Specifically, the temperature difference between the front and rear shells of the compressor is compared with a temperature difference threshold value. If the temperature difference between the front and rear shells of the compressor is greater than the temperature difference threshold value, it is determined that there is oil film accumulation in the compressor. If the temperature difference between the front and rear shells of the compressor is less than or equal to the temperature difference threshold value, it is determined that there is no oil film accumulation in the compressor.

[0053] As an example, the temperature difference threshold value can be preset based on the design parameters and operating conditions of the compressor, for example, set to 5°C at a typical ambient temperature. When the actual temperature difference reaches 6°C, it is determined that there is oil film accumulation in the compressor, thereby activating the subsequent oil return mechanism; and when the temperature difference is 4°C, it is confirmed that there is no accumulation risk in the compressor, preventing unnecessary intervention.

[0054] In step S2012, if there is oil film accumulation in the compressor and the superheat degree of the evaporator outlet is less than a superheat threshold value, the oil retention rate of the compressor is calculated according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet.

[0055] Specifically, if there is oil film accumulation in the compressor, the superheat degree of the evaporator outlet is obtained, and the superheat degree of the evaporator outlet is compared with the superheat threshold value to obtain a superheat comparison result. If the superheat comparison result indicates that the superheat degree of the evaporator outlet is less than the superheat threshold value, the oil retention rate of the compressor is calculated according to the temperature difference between the front and rear shells of the compressor and the difference between the superheat degree of the evaporator outlet and the superheat threshold value.

[0056] As an example, the superheat threshold value can be set to 20°C. When the temperature difference between the front and rear shells of the compressor is 8°C (greater than the temperature difference threshold value 5°C) and the superheat degree SH of the evaporator outlet is 1°C, the difference between the superheat degree of the evaporator outlet and the superheat threshold value is 19°C. The oil retention rate OR can be calculated by a formula, for example, OR = 0.8|ΔT| + 0.2(20-SH) (effective when SH < 20°C), and the oil retention rate is 10.2. The oil retention rate can be used for subsequent oil return control decisions, for example, when the oil retention rate exceeds a preset threshold value, the oil return mechanism is automatically started to optimize the operating efficiency of the compressor.

[0057] The compressor oil return method provided by the embodiment of the present application can more accurately determine whether oil film accumulation occurs in the compressor, and only when the oil film accumulation exists and the evaporator outlet superheat is low, the oil retention rate is calculated, thereby improving the pertinence of calculation, reducing unnecessary calculation process, further ensuring the accuracy and effectiveness of the oil return strategy, reducing unnecessary energy waste, improving the accuracy and response speed of the oil return control, and further improving the operation efficiency and stability of the compressor.

[0058] In step S202, the oil return strategy corresponding to the oil retention rate is obtained. For details, please refer to Figure 1 The step S102 of the embodiment shown in the figure will not be repeated here.

[0059] In step S203, the oil film accumulated in the evaporator and the front end of the evaporator is controlled to return to the compressor according to the oil return strategy. For details, please refer to Figure 1 The step S103 of the embodiment shown in the figure will not be repeated here.

[0060] In one possible implementation, when the oil return strategy corresponding to the oil retention rate is obtained, the oil retention range corresponding to the oil retention rate can be determined first; the correspondence between the oil retention range and the oil return strategy is obtained, wherein the correspondence includes at least one oil return strategy associated with the oil retention range; and the oil return strategy matched with the current oil retention rate is determined according to the correspondence.

[0061] As an example, the oil retention range can be divided into multiple intervals, including a low retention interval (for example, the oil retention rate is 10-30) and a high retention interval (for example, the oil retention rate is greater than 30); the correspondence includes: the low retention interval corresponds to a first oil return strategy, such as controlling the compressor to perform start-stop operation according to a first period, and adjusting the pressure difference on both sides of the electronic expansion valve during shutdown; and the high retention interval corresponds to a second oil return strategy, such as increasing the speed of the compressor to a first target speed according to a second period during the operation of the compressor and maintaining the first time length.

[0062] The compressor oil return method provided by the embodiment of the present application can take corresponding oil return measures according to different oil retention conditions, thereby improving the flexibility of the oil return operation, and ensuring the accuracy and efficiency of the oil return process.

[0063] In one possible implementation, when the oil film accumulated in the evaporator and the front end of the evaporator is controlled to return to the compressor according to the oil return strategy, if the oil return strategy is a first strategy, the compressor is controlled to perform start-stop operation according to a first period, and the pressure difference on both sides of the electronic expansion valve is adjusted during shutdown, the electronic expansion valve is located at the front end of the evaporator, and the oil retention range corresponding to the first strategy is a first retention range; the oil film accumulated in the evaporator and the front end of the evaporator is driven to return to the compressor by using the pressure difference formed on both sides of the electronic expansion valve.

[0064] As an example, the first period can be 3-8 minutes, wherein the downtime accounts for 20%-30% of the period; during the downtime, the opening of the electronic expansion valve is reduced to increase the pressure difference on both sides thereof to a preset value (for example, 0.5-1.0 MPa), so as to form a local negative pressure area at the front end of the evaporator; the pressure difference acts on the oil film surface to generate a suction force, which gradually drags the oil droplets or oil film accumulated at the evaporator pipe wall and the front end joint to the compressor oil return pipeline; at the same time, after the compressor is restarted, the running speed thereof is maintained at a normal working condition value, so as to prevent the system efficiency from being reduced due to frequent start-stop. For example, T cycle = 5 min as the first period, the operation of “4 min running + 1 min downtime” is performed, and the opening of the electronic expansion valve is adjusted to 80% opening during the downtime, so as to accelerate the oil return by using the pressure difference on both sides of the expansion valve.

[0065] The compressor oil return method provided by the embodiment of the present application further improves the oil return efficiency and accuracy by adopting the targeted oil return strategy according to the different oil retention ranges; the fine control of the oil return process is realized by controlling the start-stop operation of the compressor and adjusting the pressure difference on both sides of the electronic expansion valve, which is beneficial to prolong the service life of the compressor and improve the stability and reliability of the entire refrigeration system.

[0066] In one possible implementation, according to the oil return strategy, when the oil film accumulated at the evaporator and the front end of the evaporator is returned to the compressor, if the oil return strategy is the second strategy, the speed of the compressor is increased to a first target speed and maintained for a first time length according to a second period during the operation of the compressor, the second strategy corresponds to a second retention range, the second retention range is greater than the first retention range, and the second period is less than the first period; the first target speed of the compressor is used to drive the oil film accumulated at the evaporator and the front end of the evaporator to return to the compressor.

[0067] As an example, during the execution of the second strategy, the current operation period of the compressor can be During the operation of the compressor, the speed of the compressor is increased to a first target speed which is 50% higher than the normal working condition with a second period of 30 seconds, and maintained for a first time length of 2 seconds; during this process, the high-speed rotation of the compressor enhances the airflow power, effectively tears and pushes the oil film to move along the oil return pipeline, so as to ensure that the oil return efficiency is maximized when the oil retention range is in the second retention range. At the same time, the second strategy compensates for the oil return resistance of the larger oil retention range by shortening the period and increasing the speed, so as to prevent the oil droplets from being accumulated at the evaporator pipe wall for a long time, thereby maintaining the stable operation of the system.

[0068] The compressor oil return method provided by the embodiment of the present application can temporarily increase the rotating speed of the compressor to the first target rotating speed and maintain for a period of time according to the preset second period during the operation of the compressor, so that stronger suction force can be generated to effectively pull and return the oil film of the evaporator and the front end thereof to the compressor, thereby improving the oil return speed, reducing the risk of oil deterioration and deposition by reducing the residence time of the oil in the evaporator and the front end thereof, and further maintaining the healthy operation state of the compressor.

[0069] In a possible implementation, if the working mode of the compressor is the battery cooling alone open mode, the rotating speed of the compressor is increased to the second target rotating speed within the second time length according to a third period, and the third period is greater than the first period.

[0070] The battery cooling alone open mode is used to represent that the operation of the compressor only serves the battery thermal management system, and other cooling systems such as the air conditioning system are in the closed state. In this mode, because the battery cooling load is low, the oil residence range may be expanded, and the oil film moving resistance is increased, so a longer third period is used to adjust the rotating speed increase strategy to ensure the stable oil return efficiency under the low load working condition and prevent the oil droplets from accumulating on the evaporator tube wall.

[0071] As an example, the third period can be set to 10 minutes, and the rotating speed of the compressor is increased to the second target rotating speed which is 35% higher than the normal working condition, for example, 3000 rpm, within the second time length of 30 seconds. By using a longer period interval and a moderate rotating speed increase under the low load working condition, the oil film moving resistance is effectively reduced, the oil return process is ensured to be stable when the oil residence range is expanded, and the accumulation of oil droplets on the evaporator tube wall due to insufficient air flow power is prevented, so that the stable operation of the air conditioning system is maintained.

[0072] The compressor oil return method provided by the embodiment of the present application can gradually increase the rotating speed of the compressor to the second target rotating speed within a longer time interval and maintain for a second time length, so that the battery cooling system can obtain stable and sufficient cooling power, and the additional wear and energy consumption of the compressor caused by frequent and rapid adjustment of the rotating speed are reduced.

[0073] In a possible implementation, the historical database closest to the current time can also be queried to obtain the historical oil residence rate and the historical oil return strategy from the historical oil return record; the oil residence rate change trend is obtained by comparing the oil residence rate with the historical oil residence rate; the oil return adjustment direction is obtained by comparing the oil return strategy with the historical oil return strategy; the potential problems existing in the compressor are obtained by analyzing the obtained oil residence rate change trend and the oil return adjustment direction, and the corresponding operation optimization information is pushed based on the potential problems.

[0074] As an example, the stored historical oil return records can be queried through the database interface to obtain data fields including historical oil retention rate, historical oil return strategy and related timestamps. For example, records within the last 30 days are queried to extract oil retention rate values and corresponding speed increase strategy parameters. When comparing the current oil retention rate with the historical oil retention rate, the change rate percentage is calculated, and if the change rate exceeds a preset threshold such as ±5%, it is determined that there is an upward or downward trend; at the same time, the current oil return strategy is compared with the historical oil return strategy to analyze the strategy difference such as speed increase amplitude or cycle length adjustment, and determine the oil return adjustment direction such as "need to strengthen speed increase" or "extend cycle interval". Based on the upward trend of the oil retention rate and the oil return adjustment direction, potential problems such as increased oil film resistance or evaporator oil accumulation risk are identified, and optimization information such as "it is recommended to shorten the third cycle to 8 minutes and increase the speed increase amplitude to 40%" is pushed, which is output in real time through system logs or user interfaces, ensuring that the compressor has stable oil return efficiency under low load working conditions and preventing oil droplet accumulation.

[0075] As another example, the current compressor oil retention rate is 45, and after querying the historical database, it is found that the historical oil retention rate in the last oil return record is 30, and the historical oil return strategy is "the compressor is started and stopped every 30 minutes and the pressure difference of the electronic expansion valve is adjusted"; by comparing the current and historical oil retention rates, it is concluded that the oil retention rate is increasing (from 30 to 45); by comparing the current oil return strategy "the compressor is started and stopped every 20 minutes and the pressure difference adjustment amplitude of the electronic expansion valve is increased" with the historical oil return strategy, it is determined that the oil return adjustment direction is more aggressive (shorten the cycle and increase the pressure difference adjustment); analysis shows that the oil retention rate still increases under the more aggressive oil return strategy, indicating that the compressor may have potential problems such as partial blockage of the pipeline or decreased lubricating oil flowability, and accordingly, the operation optimization information "it is recommended to check whether the evaporator pipeline is blocked, and detect the lubricating oil viscosity to evaluate whether it needs to be replaced" is pushed.

[0076] The compressor oil return method provided by the embodiment of the present application can quickly locate the difference between the current oil return operation and the historical operation by querying the historical database and combining the oil retention rate and the oil return strategy in the historical oil return record, and then determine whether the oil return strategy needs to be adjusted to optimize the operation of the compressor; through comprehensive analysis of the oil retention rate change trend and the oil return adjustment direction, potential problems that the compressor may currently have can be accurately identified and corresponding operation optimization information can be pushed, to ensure stable operation and high efficiency of the compressor.

[0077] In a specific implementation, please refer to Figure 3If the working mode of the compressor is the single-zone air conditioner opening mode, whether the oil film is accumulated in the compressor is determined according to the temperature difference between the front shell and the rear shell of the compressor; if the oil film is accumulated in the compressor and the superheat degree of the evaporator outlet is less than the superheat degree threshold, the oil retention rate of the compressor is calculated according to the temperature difference between the front shell and the rear shell of the compressor and the superheat degree of the evaporator outlet. The oil retention range corresponding to the oil retention rate is determined; the corresponding relationship between the oil retention range and the oil return strategy is obtained; and the oil return strategy matched with the current oil retention rate is determined according to the corresponding relationship.

[0078] If the oil return strategy is the first strategy, the compressor is controlled to perform the start-stop operation according to the first period, and the pressure difference between the two sides of the electronic expansion valve is adjusted during the shutdown period. The electronic expansion valve EXV is located at the front end of the evaporator, that is, the rear end of the condenser. The oil retention range corresponding to the first strategy is the first retention range. The oil film accumulated in the evaporator and the front end of the evaporator is driven to flow back to the compressor through the Venturi section arranged at the front end of the compressor by using the pressure difference formed between the two sides of the electronic expansion valve. If the oil return strategy is the second strategy, the speed of the compressor is increased to a first target speed according to a second period during the operation of the compressor and maintained for a first time length. The oil retention range corresponding to the second strategy is the second retention range, and the second retention range is greater than the first retention range. The second period is less than the first period. The oil film accumulated in the evaporator and the front end of the evaporator is driven to flow back to the compressor through the Venturi section arranged at the front end of the compressor by using the first target speed reached by the compressor.

[0079] Further, referring to Figure 4 , the throat diameter of the Venturi section is 0.6 times the pipe diameter of the compressor oil return pipeline, and the inner wall of the throat is provided with a spiral guide groove. The lead angle of the spiral guide groove is 45°. The spiral guide groove is used to guide the oil film to flow spirally along the inner wall of the throat, so that the oil film accumulated in the evaporator and the front end of the evaporator flows back to the compressor through the spiral guide groove, while avoiding the accumulation of the oil film in the throat.

[0080] In this embodiment, a compressor oil return device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and will not be described again. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware is also possible and contemplated.

[0081] The present embodiment provides a compressor oil return device, as shown in Figure 5 , comprising:

[0082] The retention rate calculation module 501 is configured to, if the working mode of the compressor is the single-zone air conditioner opening mode, calculate the oil retention rate of the compressor according to the temperature difference between the front shell and the rear shell of the compressor and the superheat degree of the evaporator outlet.

[0083] The strategy obtaining module 502 is configured to obtain an oil return strategy corresponding to the oil retention rate.

[0084] The oil return control module 503 is configured to control the oil film accumulated in the evaporator and the front end of the evaporator to return to the compressor according to the oil return strategy.

[0085] In one possible implementation, the retention rate calculation module 501 includes:

[0086] The oil film accumulation determination unit is configured to determine whether the oil film is accumulated in the compressor according to the temperature difference between the front and rear shells of the compressor.

[0087] The oil retention rate calculation unit is configured to calculate the oil retention rate of the compressor according to the temperature difference between the front and rear shells of the compressor and the superheat of the outlet of the evaporator if the oil film is accumulated in the compressor and the superheat of the outlet of the evaporator is less than the superheat threshold.

[0088] In one possible implementation, the strategy obtaining module 502 includes:

[0089] The oil retention range determination unit is configured to determine an oil retention range corresponding to the oil retention rate.

[0090] The corresponding relationship obtaining unit is configured to obtain a corresponding relationship between the oil retention range and the oil return strategy, wherein the corresponding relationship includes at least one oil return strategy associated with the oil retention range.

[0091] The oil return strategy determination unit is configured to determine the oil return strategy matched with the current oil retention rate according to the corresponding relationship.

[0092] In one possible implementation, the oil return control module 503 includes:

[0093] The first strategy unit is configured to control the compressor to perform the start-stop operation according to the first period and adjust the pressure difference between the two sides of the electronic expansion valve if the oil return strategy is the first strategy, the electronic expansion valve is located at the front end of the evaporator, and the oil retention range corresponding to the first strategy is the first retention range.

[0094] The first oil return unit is configured to drive the oil film accumulated in the evaporator and the front end of the evaporator to return to the compressor through the Venturi section arranged at the front end of the compressor by using the pressure difference between the two sides of the electronic expansion valve, the throat diameter of the Venturi section is 0.6 times the pipe diameter of the compressor oil return pipeline, and the inner wall of the throat is provided with a spiral flow guide groove for guiding the oil film to flow spirally along the inner wall of the throat to avoid the oil film from being accumulated and blocked in the throat.

[0095] In one possible implementation, the oil return control module 503 further includes:

[0096] The second strategy unit is configured to, if the oil return strategy is a second strategy, increase the rotation speed of the compressor to a first target rotation speed and maintain the first target rotation speed for a first time length according to a second period during operation of the compressor, the oil retention range corresponding to the second strategy is a second retention range, the second retention range is greater than the first retention range, and the second period is less than the first period.

[0097] The second oil return unit is configured to drive the oil film accumulated in the evaporator and the front end of the evaporator to flow back to the compressor through the Venturi section arranged at the front end of the compressor by using the first target rotation speed of the compressor, the throat diameter of the Venturi section is 0.6 times the pipe diameter of the oil return pipeline of the compressor, and the inner wall of the throat is provided with a spiral guide groove, the spiral guide groove is used to guide the oil film to flow spirally along the inner wall of the throat to avoid the oil film from being accumulated and blocked in the throat.

[0098] In one possible implementation, the oil return control module 503 further includes:

[0099] The third oil return unit is configured to, if the working mode of the compressor is a battery cooling only open mode, increase the rotation speed of the compressor to a second target rotation speed within a second time length according to a third period, and the third period is greater than the first period.

[0100] In one possible implementation, the oil return control module 503 further includes:

[0101] The oil return record query unit is configured to query the historical database to obtain the historical oil return record closest to the current time, and obtain the historical oil retention rate and the historical oil return strategy from the historical oil return record.

[0102] The change trend obtaining unit is configured to compare the oil retention rate with the historical oil retention rate to obtain the change trend of the oil retention rate.

[0103] The oil return direction adjusting unit is configured to obtain the oil return adjusting direction by comparing the oil return strategy with the historical oil return strategy.

[0104] The operation information optimization unit is configured to analyze the obtained change trend of the oil retention rate and the oil return adjusting direction to obtain a potential problem existing in the compressor at present, and push corresponding operation optimization information based on the potential problem.

[0105] The compressor oil return device in the embodiment is presented in the form of a functional unit, and the unit herein refers to an ASIC circuit, a processor and a memory executing one or more software or fixed programs, and / or other devices that can provide the above functions.

[0106] Further function descriptions of the above various modules and units are the same as those of the above corresponding embodiments, and will not be described herein again.

[0107] The embodiment of the present application further provides a computer device having the above Figure 5The compressor oil return device shown.

[0108] Referring to Figure 6 , Figure 6 is a structural schematic diagram of a computer device provided by an optional embodiment of the present application. As shown in Figure 6 , the computer device includes one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are communicatively connected by different buses, and can be mounted on a common mainboard or otherwise mounted as needed. The processor can process instructions executed within the computer device, including instructions stored in the memory or graphics information stored in the memory to display a GUI on an external input / output device, such as a display device coupled to the interface. In some optional embodiments, multiple processors and / or multiple buses can be used with multiple memories and multiple memory, if needed. Also, multiple computer devices can be connected, each providing part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 6 The processor 10 is taken as an example in the above description.

[0109] The processor 10 can be a central processor, a network processor, or a combination thereof. The processor 10 can further include a hardware chip. The hardware chip can be an application specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device can be a complex programmable logic device, a field programmable logic gate array, a generic array logic, or any combination thereof.

[0110] The memory 20 stores instructions executable by the at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiments.

[0111] The memory 20 can include a program storage area and a data storage area. The program storage area can store an operating system and application programs required by at least one function; the data storage area can store data created by use of the computer device according to the display of a small program landing page, and the like. In addition, the memory 20 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some optional embodiments, the memory 20 can optionally include a memory remotely arranged with respect to the processor 10, and these remote memories can be connected to the computer device through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0112] The memory 20 can include a volatile memory, e.g., a random access memory, and / or a non-volatile memory, e.g., a flash memory, a hard disk, or a solid state disk. The memory 20 can also include a combination of the above-mentioned types of memories.

[0113] The computer device also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30, and the output device 40 can be connected by a bus or other means.

[0114] The input device 30 can receive input digital or character information, and generate key signal inputs in connection with a user setting of the computer device and a function control, e.g., a touch screen, a keypad, a mouse, a trackpad, a touchpad, a pointing stick, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 can include a display device, an auxiliary lighting device (e.g., an LED), a tactile feedback device (e.g., a vibration motor), etc. The display device includes, but is not limited to, a liquid crystal display, a light emitting diode, a display, and a plasma display. In some alternative embodiments, the display device can be a touch screen.

[0115] The embodiments of the present application also provide a computer readable storage medium, and the above-mentioned method according to the embodiments of the present application can be implemented in hardware, firmware, or recorded in a storage medium, or stored in a remote storage medium or a non-transitory machine readable storage medium and downloaded through network and stored in a local storage medium, so that the method described herein can be processed by such software on a storage medium using a general purpose computer, a special purpose processor, or programmable or special purpose hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid state disk, etc. Further, the storage medium can also include a combination of the above-mentioned types of memories. It can be understood that the computer, the processor, the microprocessor controller, or the programmable hardware includes a storage component that can store or receive software or computer code, when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method shown in the above-mentioned embodiments is implemented.

[0116] Part of the embodiments of the present application can be applied as a computer program product, for example, computer program instructions, when executed by a computer, through the operation of the computer, the method and / or technical solutions according to the present application can be called or provided. Those skilled in the art should understand that the form of computer program instructions in computer readable medium includes but is not limited to source file, executable file, installation package file and the like, and accordingly, the way of computer program instructions executed by computer includes but is not limited to: the computer directly executes the instructions, or the computer compiles the instructions and then executes the corresponding compiled program, or the computer reads and executes the instructions, or the computer reads and installs the instructions and then executes the corresponding installed program. Here, the computer readable medium can be any available computer readable storage medium or communication medium accessible to the computer.

[0117] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A method of oil return for a compressor, characterized by, The method comprises: If the working mode of the compressor is a single-zone air conditioner opening mode, the oil retention rate of the compressor is calculated according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet; An oil return strategy corresponding to the oil retention rate is obtained; According to the oil return strategy, the oil film accumulated in the evaporator and the front end of the evaporator is controlled to return to the compressor.

2. The method of claim 1, wherein, The oil retention rate of the compressor is calculated according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet, comprising: According to the temperature difference between the front and rear shells of the compressor, it is determined whether there is oil film accumulation in the compressor; If the oil film accumulation exists in the compressor, and the superheat degree of the evaporator outlet is less than the superheat degree threshold, the oil retention rate of the compressor is calculated according to the temperature difference between the front and rear shells of the compressor and the superheat degree of the evaporator outlet.

3. The method of claim 1, wherein, The oil return strategy corresponding to the oil retention rate is obtained, comprising: The oil retention range corresponding to the oil retention rate is determined; The corresponding relationship between the oil retention range and the oil return strategy is obtained, wherein the corresponding relationship includes at least one oil return strategy associated with the oil retention range; According to the corresponding relationship, the oil return strategy matched with the current oil retention rate is determined.

4. The method according to claim 1 or 3, characterized in that, According to the oil return strategy, the oil film accumulated in the evaporator and the front end of the evaporator is controlled to return to the compressor, comprising: If the oil return strategy is the first strategy, the compressor is controlled to perform start-stop operation according to the first period, and the pressure difference between the two sides of the electronic expansion valve located at the front end of the evaporator is adjusted during the shutdown period, and the oil retention range corresponding to the first strategy is the first retention range; The pressure difference formed by the electronic expansion valve is used to drive the oil film accumulated in the evaporator and the front end of the evaporator to return to the compressor through the Venturi section arranged at the front end of the compressor, the throat diameter of the Venturi section is 0.6 times the pipe diameter of the compressor oil return pipeline, and the inner wall of the throat is provided with a spiral guide groove, which is used to guide the oil film to flow spirally along the inner wall of the throat to avoid the oil film from being accumulated and blocked in the throat.

5. The method according to claim 1 or 3, characterized in that, According to the oil return strategy, the oil film accumulated in the evaporator and the front end of the evaporator is controlled to return to the compressor, further comprising: If the oil return strategy is the second strategy, the speed of the compressor is increased to a first target speed according to a second period during the operation of the compressor and maintained for a first time, the oil retention range corresponding to the second strategy is the second retention range, the second retention range is greater than the first retention range, and the second period is less than the first period; The first target speed reached by the compressor is used to drive the oil film accumulated in the evaporator and the front end of the evaporator to return to the compressor through the Venturi section arranged at the front end of the compressor, the throat diameter of the Venturi section is 0.6 times the pipe diameter of the compressor oil return pipeline, and the inner wall of the throat is provided with a spiral guide groove, which is used to guide the oil film to flow spirally along the inner wall of the throat to avoid the oil film from being accumulated and blocked in the throat.

6. The method of claim 1, wherein, The method further comprises: If the working mode of the compressor is the battery cooling only mode, the rotating speed of the compressor is increased to a second target rotating speed in a second time length according to a third cycle, and the third cycle is greater than the first cycle.

7. The method of claim 1, wherein, The method further comprises: querying a historical database to obtain a history oil return record closest to a current time, and obtaining a history oil retention rate and a history oil return strategy from the history oil return record; comparing the oil retention rate with the history oil retention rate to obtain an oil retention rate change trend; comparing the oil return strategy with the history oil return strategy to obtain an oil return adjustment direction; analyzing the obtained oil retention rate change trend and oil return adjustment direction to obtain a potential problem currently existing in the compressor, and pushing corresponding operation optimization information based on the potential problem.

8. A compressor oil return device characterized by, The device comprises: a retention rate calculation module configured to calculate an oil retention rate of the compressor according to a temperature difference between a front shell and a rear shell of the compressor and a superheat degree of an evaporator outlet if the working mode of the compressor is the single-zone air conditioner on mode; a strategy acquisition module configured to acquire an oil return strategy corresponding to the oil retention rate; an oil return control module configured to control an oil film accumulated in the evaporator and a front end of the evaporator to flow back to the compressor according to the oil return strategy.

9. A computer device, comprising: comprise: a memory and a processor, which are in communication connection with each other, and the memory stores computer instructions, and the processor executes the computer instructions to perform the method in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions, and the computer instructions are used to make a computer execute the method in any one of claims 1 to 7.

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