Oil return control method and device of air conditioner, air conditioner and storage medium

Abstract

The invention relates to the technical field of air conditioners, in particular to an oil return control method and device of an air conditioner, the air conditioner and a storage medium. Pipeline parameters of a refrigerant connecting pipeline in the air conditioner are detected, and the retention amount of lubricating oil in a target connecting pipeline is predicted through a preset lubricating oil distribution prediction model; and then the air conditioner is controlled to execute the corresponding oil return operation according to the lubricating oil retention amount, normal operation of the air conditioner is prevented from being affected, the use experience of a user using the air conditioner is not affected, and the technical problem that in the prior art, when the air conditioner returns oil, the air conditioner possibly conflicts with the current operation mode of the air conditioner, and the use experience of the user is affected is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and particularly relates to an oil return control method and device of an air conditioner, the air conditioner and a storage medium. BACKGROUND

[0002] In the operation process of an air conditioner, in order to reduce the friction work of a compressor, avoid refrigerant leakage and the like, the compressor will carry out part of lubricating oil while outputting refrigerant. However, the total amount of lubricating oil of the air conditioner is limited, and the pipeline between an indoor unit and an outdoor unit of the air conditioner is relatively long and may have a drop, which may cause the lubricating oil to be retained in the refrigerant pipeline. If the lubricating oil in the pipeline is not recovered in time, the air conditioner may be stopped, and the operation reliability of the air conditioner is affected.

[0003] The traditional oil return technology is generally to set a fixed time length and return oil at fixed time intervals according to the fixed time length. However, in this process, the current operation mode of the air conditioner may be conflicted, and the user experience is affected.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The main purpose of the present application is to provide an oil return control method and device of an air conditioner, the air conditioner and a storage medium, which aims to solve the technical problem that the air conditioner in the prior art may conflict with the current operation mode of the air conditioner when returning oil, and affect the user experience.

[0006] To achieve the above purpose, the present application provides an oil return control method of an air conditioner, which comprises the following steps:

[0007] obtaining a pipeline parameter of a target connecting pipeline in the air conditioner;

[0008] predicting a lubricating oil retention amount in the target connecting pipeline based on the pipeline parameter through a preset lubricating oil distribution prediction model;

[0009] controlling the air conditioner to perform an oil return operation corresponding to the lubricating oil retention amount.

[0010] Optionally, the step of predicting the lubricating oil retention amount in the target connecting pipeline based on the pipeline parameter through the preset lubricating oil distribution prediction model comprises:

[0011] obtaining an environmental temperature and an environmental pressure of a region where the target connecting pipeline is located;

[0012] querying basic parameters of refrigerant and lubricating oil in the target connecting pipeline under the environmental temperature and the environmental pressure;

[0013] predicting, according to the basic parameters, the pipeline parameters, and a preset dimensionless constant, a lubricating oil retention amount in the target connecting pipeline by a preset lubricating oil distribution prediction model.

[0014] Optionally, before the step of predicting, according to the basic parameters, the pipeline parameters, and a preset dimensionless constant, a lubricating oil retention amount in the target connecting pipeline by a preset lubricating oil distribution prediction model, the method further comprises:

[0015] obtaining a refrigerant type and a lubricating oil type of the air conditioner;

[0016] querying a preset dimensionless constant corresponding to the refrigerant type and the lubricating oil type.

[0017] Optionally, the basic parameters at least include mass flow density, gas phase density, liquid phase viscosity coefficient, and liquid phase density, and the pipeline parameters at least include pipeline length, pipeline diameter, and oil circulation rate.

[0018] The step of predicting, according to the basic parameters, the pipeline parameters, and a preset dimensionless constant, a lubricating oil retention amount in the target connecting pipeline by a preset lubricating oil distribution prediction model comprises:

[0019] calculating a liquid phase reduced Reynolds number according to the mass flow density, the pipeline diameter, and the liquid phase viscosity coefficient;

[0020] calculating a liquid phase reduced Froude number according to the mass flow density, the pipeline diameter, a gravitational constant, and the liquid phase density;

[0021] calculating a corresponding lubricating oil retention amount in the target connecting pipeline according to the liquid phase reduced Reynolds number, the liquid phase reduced Froude number, the mass flow density, the pipeline diameter, the pipeline length, a preset dimensionless constant, the oil circulation rate, and the gas phase density.

[0022] Optionally, the step of calculating a corresponding lubricating oil retention amount in the target connecting pipeline according to the liquid phase reduced Reynolds number, the liquid phase reduced Froude number, the mass flow density, the pipeline diameter, the pipeline length, a preset dimensionless constant, the oil circulation rate, and the gas phase density comprises:

[0023] dimensionally converting the mass flow density, the pipeline diameter, and the oil circulation rate respectively to obtain dimensionless mass flow density, dimensionless pipeline diameter, and dimensionless oil circulation rate;

[0024] calculating a dimensionless lubricating oil retention amount according to the liquid phase reduced Reynolds number, the liquid phase reduced Froude number, the dimensionless mass flow density, the dimensionless pipeline diameter, the dimensionless oil circulation rate, and a preset dimensionless constant;

[0025] The lubricating oil retention amount in the target connecting pipeline is calculated according to the dimensionless lubricating oil retention amount, the pipeline diameter, the pipeline length, and the gas phase density.

[0026] Optionally, the air conditioner comprises an air conditioner outdoor unit and at least one air conditioner indoor unit, the air conditioner outdoor unit comprises a compressor, and the air conditioner indoor unit is provided with an electronic expansion valve for controlling the refrigerant flow in the refrigerant pipeline.

[0027] The control of the air conditioner to perform the oil return operation corresponding to the lubricating oil retention amount comprises:

[0028] The opening degree of the electronic expansion valve, the operating frequency of the compressor, and the continuous operating time of the compressor are adjusted according to the lubricating oil retention amount.

[0029] Optionally, the adjustment amount of the lubricating oil retention amount, the opening degree of the electronic expansion valve, the operating frequency of the compressor, and the continuous operating time of the compressor are all positively correlated.

[0030] In addition, to achieve the above-mentioned purpose, the present application further provides an oil return control device of an air conditioner, which comprises:

[0031] An acquisition module is configured to acquire pipeline parameters of a target connecting pipeline in an air conditioner.

[0032] A prediction module is configured to predict a lubricating oil retention amount in the target connecting pipeline based on the pipeline parameters through a preset lubricating oil distribution prediction model.

[0033] An oil return module is configured to control the air conditioner to perform an oil return operation corresponding to the lubricating oil retention amount.

[0034] In addition, to achieve the above-mentioned purpose, the present application further provides an air conditioner, which comprises a memory, a processor, and an oil return control program of an air conditioner stored in the memory and executable on the processor, and the oil return control program of the air conditioner is configured to implement the steps of the oil return control method of the air conditioner as described above.

[0035] In addition, to achieve the above-mentioned purpose, the present application further provides a storage medium, which stores an oil return control program of an air conditioner, and the oil return control program of the air conditioner, when executed by a processor, implements the steps of the oil return control method of the air conditioner as described above.

[0036] In addition, to achieve the above-mentioned purpose, the present application further provides a computer program product, which comprises a computer program, and the computer program, when executed by a processor, implements the steps of the oil return control method of the air conditioner as described above.

[0037] One or more technical solutions proposed in the present application have at least the following technical effects: the present invention obtains the pipeline parameters of the target connecting pipeline in the air conditioner; predicts the lubricating oil retention amount in the target connecting pipeline through a preset lubricating oil distribution prediction model based on the pipeline parameters; controls the air conditioner to perform the oil return operation corresponding to the lubricating oil retention amount, detects the pipeline parameters of the refrigerant connecting pipeline in the air conditioner, and predicts the lubricating oil retention amount in the target connecting pipeline through a preset lubricating oil distribution prediction model, and then controls the air conditioner to perform the corresponding oil return operation according to the size of the lubricating oil retention amount, thereby avoiding affecting the normal operation of the air conditioner and the user experience of using the air conditioner, and avoiding the technical problem in the prior art that the air conditioner may conflict with the current operating mode of the air conditioner when returning oil, thereby affecting the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] Figure 1 1. It is a flow chart of a first embodiment of an oil return control method for an air conditioner according to the present invention;

[0041] Figure 2 Schematic diagram of the flow of the second embodiment of the oil return control method for an air conditioner according to the present invention;

[0042] Figure 3 A schematic flow chart of a third embodiment of an oil return control method for an air conditioner according to the present invention;

[0043] Figure 4 This is a structural block diagram of a first embodiment of an oil return control device for an air conditioner according to the present invention;

[0044] Figure 5 It is a structural diagram of an air conditioner in a hardware operating environment involved in an embodiment of the present invention.

[0045] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0046] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0047] In order to better understand the technical solutions of the present application, the following will be described in detail in combination with the drawings of the specification and specific embodiments.

[0048] The main solution of the embodiments of the present application is: obtaining pipeline parameters of a target connecting pipeline in an air conditioner; predicting a lubricating oil retention amount in the target connecting pipeline based on the pipeline parameters through a preset lubricating oil distribution prediction model; and controlling the air conditioner to perform an oil return operation corresponding to the lubricating oil retention amount.

[0049] In the prior art, in order to reduce the friction work of the compressor, avoid refrigerant leakage and other reasons, the compressor will carry out a part of lubricating oil while outputting refrigerant during the operation of the air conditioner. However, the total amount of lubricating oil of the air conditioner is limited, and the pipeline between the indoor unit and the outdoor unit of the air conditioner is relatively long, which may have a drop, and may cause the lubricating oil to be retained in the refrigerant pipeline. If the lubricating oil in the pipeline is not recovered in time, it may cause the air conditioner to stop and affect the operation reliability of the air conditioner.

[0050] The traditional oil return technology generally returns oil at fixed time intervals by setting a fixed time length. However, the fixed time return cannot accurately calculate the distribution of system lubricating oil, and cannot control the oil return according to the actual needs of the system, which may conflict with the current operation mode of the air conditioner and affect the user experience.

[0051] For example, when the system is heating, if oil return is entered without the need for oil return, the air conditioner will be switched to perform oil return, which will affect the heating comfort of the room. When the system is cooling, if oil return is performed without the need for oil return, the compressor operating frequency and system refrigerant flow will change, which will affect the room temperature stability and affect the cooling comfort. Whether in heating or cooling mode, the oil return operation will produce noise, especially the indoor unit in standby state, which will affect the user's noise.

[0052] The present application provides a solution by detecting the pipeline parameters of the refrigerant connecting pipeline in the air conditioner, predicting the lubricating oil retention amount in the target connecting pipeline through a pre-set lubricating oil distribution prediction model, and then controlling the air conditioner to perform the corresponding oil return operation according to the size of the lubricating oil retention amount, thereby avoiding affecting the normal operation of the air conditioner and not affecting the user experience of using the air conditioner. The technical problem of the prior art that the air conditioner may conflict with the current operation mode of the air conditioner during oil return and affect the user experience is avoided.

[0053] It should be noted that the execution subject of the embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone or the like, or an electronic device, an air conditioner or the like capable of realizing the above functions. The oil return control of the air conditioner is taken as an example to illustrate the embodiment and the following embodiments.

[0054] Based on this, the embodiment of the present application provides an oil return control method of an air conditioner, which refers to Figure 1 , Figure 1 The flowchart of the first embodiment of the oil return control method of the air conditioner of the present application is shown.

[0055] In the embodiment, the oil return control method of the air conditioner comprises the following steps:

[0056] Step S10: Obtain the pipeline parameters of the target connecting pipeline in the air conditioner.

[0057] It should be noted that the execution subject of the embodiment method can be a device with data acquisition, data processing and program running functions, such as a controller or a control chip of an air conditioner or the like, and can also be other devices capable of realizing the same or similar functions. In the embodiment and the following embodiments, the controller of the air conditioner will be taken as an example for illustration.

[0058] It can be understood that the air conditioner in the embodiment and the subsequent embodiments can be a multi-split air conditioner or other types of air conditioners. Since the multi-split air conditioner is a combination of one air conditioner outdoor unit and multiple air conditioner indoor units or temperature control modules, its refrigerant pipeline is longer and has more refrigerant pipeline connection ports, and it is more difficult to return oil, and the technical problems mentioned above are more serious. Therefore, the embodiment and the subsequent embodiments take the multi-split air conditioner as an example for illustration.

[0059] The target connecting pipeline in the air conditioner refers to the pipeline area with a connecting port in the refrigerant pipeline of the air conditioner, such as the refrigerant pipeline in the area where the outdoor unit stop valve is located or the refrigerant pipeline in the area where the electronic expansion valve is located, and the embodiment does not make specific limitation thereon. Since the air conditioner is not integrally produced, it is composed of multiple small elements in structure, and in order to prevent refrigerant leakage during the operation of the air conditioner, the connecting area of the element and the refrigerant pipeline is generally connected through a specially designed connecting port. There may be some gaps in these areas, and the lubricating oil carried out by the refrigerant will be retained in these gaps, resulting in less and less lubricating oil in the compressor, increasing the friction of the compressor operation and affecting the normal operation of the air conditioner.

[0060] The pipeline parameters include but are not limited to the pipeline diameter and the pipeline length of the target connecting pipeline, wherein the pipeline diameter refers to the inner diameter of the pipeline.

[0061] Step S20: predicting the lubricating oil retention amount in the target connecting pipeline based on the pipeline parameter through a preset lubricating oil distribution prediction model.

[0062] It should be understood that the preset lubricating oil distribution prediction model can calculate the possible lubricating oil retention amount under different pipeline parameters according to the correlation formula. Since the refrigerant in the pipeline has three states: gaseous state, liquid state and mixed state of liquid and gaseous state, and considering that lubricating oil may exist in the pipeline, the density parameters in different states are different. When predicting the possible lubricating oil retention amount in the target connecting pipeline, the basic parameters of the refrigerant and the lubricating oil in the target connecting pipeline can also be considered to improve the accuracy of the lubricating oil retention amount prediction.

[0063] The volume of lubricating oil is difficult to calculate in irregular pipelines, so the lubricating oil retention amount in this embodiment mainly refers to the mass of lubricating oil remaining in the target connecting pipeline.

[0064] Step S30: controlling the air conditioner to perform the oil return operation corresponding to the lubricating oil retention amount.

[0065] In this embodiment, the oil return operation includes but is not limited to adjusting the opening degree of the motor expansion valve in the indoor unit and the operating frequency of the compressor, etc. It can also switch the operating mode of the air conditioner, so that most of the lubricating oil carried out by the refrigerant when the compressor is running can be left in the outdoor unit pipeline close to the compressor. In this embodiment, the greater the lubricating oil retention amount, the higher the oil return efficiency of the corresponding oil return operation, and the smaller the lubricating oil retention amount, the lower the oil return efficiency of the corresponding oil return operation.

[0066] This embodiment obtains the pipeline parameter of the target connecting pipeline in the air conditioner, predicts the lubricating oil retention amount in the target connecting pipeline based on the pipeline parameter through a preset lubricating oil distribution prediction model, and controls the air conditioner to perform the oil return operation corresponding to the lubricating oil retention amount. By detecting the pipeline parameter of the refrigerant connecting pipeline in the air conditioner and predicting the lubricating oil retention amount in the target connecting pipeline through the pre-set lubricating oil distribution prediction model, the corresponding oil return operation of the air conditioner is controlled according to the size of the lubricating oil retention amount, which avoids affecting the normal operation of the air conditioner and does not affect the user's experience of using the air conditioner, avoiding the technical problem that the air conditioner in the prior art may conflict with the current operating mode of the air conditioner when returning oil, affecting the user's experience.

[0067] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as the above-mentioned first embodiment can be referred to the above introduction, and will not be described hereinafter. On this basis, please refer to Figure 2 , step S20, comprising:

[0068] Step S201: obtaining the environmental temperature and environmental pressure of the area where the target connecting pipeline is located.

[0069] In the embodiment, the environment temperature and the environment pressure of the area where the target connection pipeline is located can be collected by the temperature-sensing bag or the temperature sensor installed in the area where the target connection pipeline is located. Since the temperature of the refrigerant pipeline in each section of the area tends to be stable after the stable operation of the air conditioner, the pipe wall temperature of the target connection pipeline can also be obtained for subsequent query of the basic parameters of the refrigerant and the lubricating oil, which is not specifically limited in the embodiment.

[0070] Step S202: Query the basic parameters of the refrigerant and the lubricating oil in the target connection pipeline under the environment temperature and the environment pressure.

[0071] Since the refrigerant and the lubricating oil in the refrigerant pipeline are in a mixed state, the density of the refrigerant in the pipeline is related to the temperature and the pressure of the environment under different environment temperature and environment pressure when calculating the retention amount of the lubricating oil. In order to improve the accuracy of the calculation of the retention amount of the lubricating oil, the basic parameters of the refrigerant and the lubricating oil under different environment temperature and pressure are queried in the embodiment to reduce the influence of environmental factors on the calculation of the retention amount of the lubricating oil.

[0072] The basic parameters include but are not limited to the refrigerant density, the lubricating oil concentration, the mass flow density, the gas phase density, the liquid phase viscosity coefficient and the liquid phase density. The formula for calculating the gas phase density and the liquid phase density is:

[0073]

[0074] wherein ω oil is the oil concentration, the oil concentration is equal to the oil circulation rate OCR since the refrigerant and the lubricating oil are completely miscible, and the oil concentration is determined according to the given oil circulation rate OCR value, ρ ref is the refrigerant density, the refrigerant density is obtained by querying the environment temperature and the pressure, and the units of the gas phase density and the liquid phase density are kg / m 3 .

[0075] Step S203: According to the basic parameters, the pipeline parameters and the preset dimensionless constant, the retention amount of the lubricating oil in the target connection pipeline is predicted by a preset lubricating oil distribution prediction model.

[0076] In the embodiment, the retention amount of the lubricating oil in the target connection pipeline is calculated by first calculating the dimensionless retention amount of the lubricating oil and then converting it into the retention amount of the lubricating oil in the target connection pipeline by the preset lubricating oil distribution prediction model. The calculation steps of the retention amount of the lubricating oil are simplified by dimensionless calculation, and the complexity of the prediction is simplified.

[0077] In an embodiment, the step of predicting the lubricating oil holdup in the target connecting pipeline according to the base parameters and the pipeline parameters and preset dimensionless constants through a preset lubricating oil distribution prediction model comprises:

[0078] calculating a liquid-phase reduced Reynolds number according to the mass flow density, the pipeline diameter and the liquid-phase viscosity coefficient;

[0079] calculating a liquid-phase reduced Froude number according to the mass flow density, the pipeline diameter, the gravitational constant and the liquid-phase density;

[0080] calculating the lubricating oil holdup in the target connecting pipeline according to the liquid-phase reduced Reynolds number, the liquid-phase reduced Froude number, the mass flow density, the pipeline diameter, the pipeline length, preset dimensionless constants, the oil circulation rate and the gas-phase density.

[0081] In a specific implementation, the formula for calculating the dimensionless lubricating oil holdup is as follows:

[0082]

[0083] wherein M* represents the dimensionless lubricating oil holdup, Re io is the liquid-phase reduced Reynolds number, Fr io is the liquid-phase reduced Froude number, G* represents the dimensionless mass flow density, D* represents the dimensionless pipeline diameter, OCR* represents the dimensionless oil circulation rate, and a0-a5 are preset dimensionless constants.

[0084] Further, before the step of predicting the lubricating oil holdup in the target connecting pipeline according to the base parameters and the pipeline parameters and preset dimensionless constants through a preset lubricating oil distribution prediction model, the method further comprises:

[0085] obtaining the refrigerant type and the lubricating oil type of the air conditioner;

[0086] querying preset dimensionless constants corresponding to the refrigerant type and the lubricating oil type.

[0087] The preset dimensionless constants are related to the refrigerant type and the lubricating oil type, for example, 0.08, -0.75, -4.2, 8.8, 3.8, etc., which are not limited in the embodiment.

[0088] Specifically, the formula for calculating the liquid-phase reduced Reynolds number is as follows:

[0089]

[0090] wherein G represents the mass flow density, D represents the pipeline diameter, and μliquid represents the liquid-phase viscosity coefficient.

[0091] The formula for calculating the liquid-phase reduced Froude number is:

[0092]

[0093] wherein G is the mass flow density, D is the pipe diameter, g is the gravitational constant, and ρliquid is the liquid density.

[0094] In another possible implementation, the calculation of the lubricating oil retention amount in the target connecting pipe according to the liquid-phase reduced Reynolds number, the liquid-phase reduced Froude number, the mass flow density, the pipe diameter, the pipe length, a preset dimensionless constant, the oil circulation rate, and the gas density comprises:

[0095] The mass flow density, the pipe diameter, and the oil circulation rate are respectively dimensionless converted to obtain a dimensionless mass flow density, a dimensionless pipe diameter, and a dimensionless oil circulation rate;

[0096] A dimensionless lubricating oil retention amount is calculated according to the liquid-phase reduced Reynolds number, the liquid-phase reduced Froude number, the dimensionless mass flow density, the dimensionless pipe diameter, the dimensionless oil circulation rate, and a preset dimensionless constant;

[0097] The lubricating oil retention amount in the target connecting pipe is calculated according to the dimensionless lubricating oil retention amount, the pipe diameter, the pipe length, and the gas density.

[0098] In a specific implementation, the formula for dimensionless converting the mass flow density is:

[0099]

[0100] wherein G is the mass flow density of the refrigerant and lubricating oil mixture, and the unit is kg / m 2 s.

[0101] The formula for dimensionless converting the pipe diameter is:

[0102]

[0103] wherein D is the pipe diameter, and the unit is mm.

[0104] The formula for dimensionless converting the oil circulation rate is:

[0105]

[0106] wherein OCR is the oil circulation rate, and is a fixed value related to the compressor of the air conditioning unit.

[0107] Further, after the dimensionless lubricating oil retention amount is calculated according to the liquid-phase reduced Reynolds number, the liquid-phase reduced Froude number, the dimensionless mass flow density, the dimensionless pipeline diameter, the dimensionless straight oil circulation rate, and the preset dimensionless constant, the actual lubricating oil retention amount can be deduced reversely, and the specific calculation formula is:

[0108]

[0109] wherein, Moil is the lubricating oil mass, D is the pipeline diameter, L is the pipeline length, p gas is the gas-phase density, and M* is the dimensionless lubricating oil retention amount.

[0110] In this embodiment, the mass flow density, the pipeline diameter, and the oil circulation rate are respectively converted into dimensionless forms, and the dimensionless lubricating oil retention amount is calculated by combining the dimensionless constant, so that the calculation steps of the lubricating oil retention amount are simplified, and the calculation efficiency of the lubricating oil retention amount is improved.

[0111] Based on the second embodiment, the third embodiment of the present application is proposed, please refer to Figure 3 In this embodiment, the step S30 comprises:

[0112] Step S301: adjusting at least one of the opening degree of the electronic expansion valve, the operating frequency of the compressor, and the continuous operating time of the compressor according to the lubricating oil retention amount.

[0113] It should be noted that, in order to improve the oil return control efficiency of the air conditioner, for the multi-split air conditioner, this embodiment can also control the air conditioner to run in the refrigeration mode, so that most of the lubricating oil carried by the refrigerant can be left in the outdoor unit. Since the outdoor unit is close to the compressor, the oil return efficiency is higher. At the same time, an oil separator can be arranged at the refrigerant outlet of the compressor to reduce the lubricating oil carried by the refrigerant.

[0114] In a specific implementation, when the lubricating oil retention amount is greater than the target limit threshold, the air conditioning unit performs the oil return operation corresponding to the lubricating oil retention amount. Different degrees of retention amount perform different oil return actions, and the adjustment amount of the lubricating oil retention amount, the opening degree of the electronic expansion valve, the operating frequency of the compressor, and the continuous operating time of the compressor are all positively correlated.

[0115] For example: when the lubricating oil retention amount Moil is greater than the target limit threshold Mlimt1, the compressor runs at F1 for T1 time, and the electronic expansion valve opening degree is P1; when the lubricating oil retention amount Moil is greater than the target limit threshold Mlimt2, the compressor runs at F2 for T2 time, and the electronic expansion valve opening degree is P2; when the lubricating oil retention amount Moil is greater than the target limit threshold Mlimt3, the compressor runs at F3 for T3 time, and the electronic expansion valve opening degree is P2, wherein F3>F2>F1, T3>T2>T1, and P3>P2>P1.

[0116] The embodiment controls the air conditioner to perform the oil return operation of the corresponding gear according to the size of the lubricating oil retention amount, avoids insufficient oil return efficiency when the lubricating oil retention amount is large, or affects the temperature of the current indoor environment when the lubricating oil retention amount is small, and reduces the customer experience.

[0117] The application also provides an oil return control device of an air conditioner, which refers to Figure 4 The oil return control device of the air conditioner comprises:

[0118] The acquisition module 10 is configured to acquire a pipeline parameter of a target connecting pipeline in the air conditioner.

[0119] The prediction module 20 is configured to predict a lubricating oil retention amount in the target connecting pipeline based on the pipeline parameter by using a preset lubricating oil distribution prediction model.

[0120] The oil return module 30 is configured to control the air conditioner to perform an oil return operation corresponding to the lubricating oil retention amount.

[0121] In an embodiment, the prediction module 20 is further configured to acquire an environmental temperature and an environmental pressure of an area where the target connecting pipeline is located, query basic parameters of refrigerant and lubricating oil in the target connecting pipeline under the environmental temperature and the environmental pressure, and predict the lubricating oil retention amount in the target connecting pipeline according to the basic parameters, the pipeline parameter, and a preset dimensionless constant by using the preset lubricating oil distribution prediction model.

[0122] In an embodiment, the prediction module 20 is further configured to acquire a refrigerant type and a lubricating oil type of the air conditioner, and query a preset dimensionless constant corresponding to the refrigerant type and the lubricating oil type.

[0123] In an embodiment, the prediction module 20 is further configured to calculate a liquid-phase converted Reynolds number according to the mass flow density, the pipeline diameter, and the liquid-phase viscosity coefficient, calculate a liquid-phase converted Froude number according to the mass flow density, the pipeline diameter, a gravitational constant, and the liquid-phase density, and calculate the lubricating oil retention amount in the target connecting pipeline corresponding to the liquid-phase converted Reynolds number, the liquid-phase converted Froude number, the mass flow density, the pipeline diameter, the pipeline length, the preset dimensionless constant, the oil circulation rate, and the gas-phase density.

[0124] In an embodiment, the prediction module 20 is further configured to perform dimensionless conversion on the mass flow rate, the pipe diameter and the oil circulation rate respectively to obtain a dimensionless mass flow rate, a dimensionless pipe diameter and a dimensionless oil circulation rate; calculate a dimensionless lubricating oil retention amount according to the liquid-phase reduced Reynolds number, the liquid-phase reduced Froude number, the dimensionless mass flow rate, the dimensionless pipe diameter, the dimensionless oil circulation rate and a preset dimensionless constant; and calculate the lubricating oil retention amount in the target connecting pipe according to the dimensionless lubricating oil retention amount, the pipe diameter, the pipe length and the gas-phase density.

[0125] In an embodiment, the oil return module 30 is further configured to adjust at least one of the opening degree of the electronic expansion valve, the operating frequency of the compressor and the continuous operating time of the compressor according to the lubricating oil retention amount.

[0126] In an embodiment, the oil return module 30 is further configured to positively correlate the adjustment amount of the lubricating oil retention amount with the opening degree of the electronic expansion valve, the operating frequency of the compressor and the continuous operating time of the compressor.

[0127] The embodiment obtains the pipe parameters of a target connecting pipe in an air conditioner, predicts a lubricating oil retention amount in the target connecting pipe based on the pipe parameters through a preset lubricating oil distribution prediction model, controls the air conditioner to perform an oil return operation corresponding to the lubricating oil retention amount, detects the pipe parameters of a refrigerant connecting pipe in the air conditioner, predicts the lubricating oil retention amount in the target connecting pipe through the pre-set lubricating oil distribution prediction model, and controls the air conditioner to perform a corresponding oil return operation according to the size of the lubricating oil retention amount, thereby avoiding affecting the normal operation of the air conditioner, not affecting the user experience of using the air conditioner, and avoiding the technical problem that the air conditioner in the prior art may conflict with the current operation mode of the air conditioner during oil return, thereby affecting the user experience.

[0128] The oil return control device of the air conditioner provided in the present application adopts the oil return control method of the air conditioner in the above embodiments, and can solve the technical problem of oil return control of the air conditioner. Compared with the prior art, the oil return control device of the air conditioner provided in the present application has the same beneficial effects as the oil return control method of the air conditioner provided in the above embodiments, and other technical features in the oil return control device of the air conditioner are the same as the features disclosed in the above embodiments, which will not be repeated here.

[0129] The present application provides an air conditioner, which comprises at least one processor and a memory in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the oil return control method of the air conditioner in the above embodiment one.

[0130] Reference below Figure 5 , which shows a schematic diagram of the structure of an air conditioner suitable for implementing the embodiments of the present application. The air conditioner in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), and in-vehicle terminals (e.g., in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 5 The air conditioner shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0131] like Figure 5 As shown, the air conditioner may include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in a read-only memory (ROM) 1002 or programs loaded from a storage device 1003 into a random access memory (RAM) 1004. RAM 1004 also stores various programs and data required for the operation of the air conditioner. Processing device 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to I / O interface 1006: input devices 1007 including, for example, a touch screen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage device 1003 including, for example, a magnetic tape, hard disk, etc.; and communication device 1009. Communication device 1009 can allow air conditioner to carry out wireless or wired communication with other equipment to exchange data.Although air conditioner with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown.Can implement or have more or less systems instead.

[0132] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer readable medium, the computer program containing program codes for executing the method shown in the flowchart. In such embodiments, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiments disclosed in the present application are executed.

[0133] The air conditioner provided by the present application adopts the oil return control method of the air conditioner in the above-mentioned embodiments, and can solve the technical problem of oil return control of the air conditioner. Compared with the prior art, the air conditioner provided by the present application has the same beneficial effects as the oil return control method of the air conditioner provided by the above-mentioned embodiments, and other technical features in the air conditioner are the same as the features disclosed in the previous embodiment method, which will not be repeated here.

[0134] It should be understood that parts of the present application can be realized by hardware, software, firmware or a combination thereof. In the description of the above-mentioned embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0135] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0136] The present application provides a computer readable storage medium having stored thereon computer readable program instructions (i.e. computer program) for executing the oil return control method of the air conditioner in the above-mentioned embodiments.

[0137] The computer readable storage medium provided in the application may, for example, be a U disk, but is not limited to an electric, magnetic, optical, electromagnetic, infrared, or semiconductor system, system, or device, or any combination of the above. More specific examples of the computer readable storage medium can include, but are not limited to, an electric connection with one or more conductive wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the embodiment, the computer readable storage medium can be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system, or device. The program code contained on the computer readable storage medium can be transmitted by any suitable medium, including but not limited to an electric wire, an optical cable, an RF (Radio Frequency), and the like, or any suitable combination of the above.

[0138] The above computer readable storage medium can be contained in the air conditioner or exist separately without being assembled into the air conditioner.

[0139] The above computer readable storage medium carries one or more programs, when the one or more programs are executed by the air conditioner, the air conditioner: obtains a pipe parameter of a target connecting pipe in the air conditioner; predicts a lubricating oil retention amount in the target connecting pipe based on the pipe parameter through a preset lubricating oil distribution prediction model; and controls the air conditioner to perform an oil return operation corresponding to the lubricating oil retention amount

[0140] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0141] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0142] The modules involved in the embodiments of the present application can be implemented in software or hardware. In some cases, the name of the module does not constitute a limitation on the module itself.

[0143] The readable storage medium provided by the present application is a computer readable storage medium, which stores computer readable program instructions (i.e. computer program) for executing the oil return control method of the air conditioner, and can solve the technical problem of oil return control of the air conditioner. Compared with the prior art, the computer readable storage medium provided by the present application has the same beneficial effects as the oil return control method of the air conditioner provided by the above-mentioned embodiments, and will not be described here.

[0144] The application further provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of the oil return control method of the air conditioner.

[0145] The computer program product provided by the application can solve the technical problem of oil return control of the air conditioner. Compared with the prior art, the beneficial effects of the computer program product provided by the application are the same as those of the oil return control method of the air conditioner provided by the above-mentioned embodiments, and are not described here.

[0146] The above-mentioned is only part of the embodiments of the application, and does not limit the patent scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or direct / indirect application in other related technical fields under the technical concept of the application, including in the patent protection scope of the application.

Claims

1. An oil return control method of an air conditioner, characterized by, The oil return control method of the air conditioner comprises: Obtaining pipeline parameters of a target connecting pipeline in an air conditioner; Based on the pipeline parameters, predicting the lubricating oil retention amount in the target connecting pipeline through a preset lubricating oil distribution prediction model; Controlling the air conditioner to perform an oil return operation corresponding to the lubricating oil retention amount.

2. The oil return control method of claim 1, wherein, The method comprises: Obtaining the ambient temperature and ambient pressure of the region where the target connecting pipeline is located; Querying the basic parameters of the refrigerant and lubricating oil in the target connecting pipeline under the ambient temperature and ambient pressure; According to the basic parameters, the pipeline parameters and a preset dimensionless constant, the lubricating oil retention amount in the target connecting pipeline is predicted through a preset lubricating oil distribution prediction model.

3. The oil return control method of claim 2, wherein, Before the prediction, the method further comprises: Obtaining the refrigerant type and lubricating oil type of the air conditioner; Querying the preset dimensionless constant corresponding to the refrigerant type and lubricating oil type.

4. The oil return control method of claim 2, wherein, The basic parameters at least include mass flow density, gas phase density, liquid phase viscosity coefficient, liquid phase density, and the pipeline parameters at least include pipeline length, pipeline diameter and oil circulation rate; The method comprises: According to the mass flow density, the pipeline diameter and the liquid phase viscosity coefficient, a liquid phase equivalent Reynolds number is calculated; According to the mass flow density, the pipeline diameter, the gravitational constant and the liquid phase density, a liquid phase equivalent Froude number is calculated; According to the liquid phase equivalent Reynolds number, the liquid phase equivalent Froude number, the mass flow density, the pipeline diameter, the pipeline length, the preset dimensionless constant, the oil circulation rate and the gas phase density, the lubricating oil retention amount in the target connecting pipeline is calculated.

5. The oil return control method of claim 4, wherein, The method comprises: The mass flow density, the pipeline diameter and the oil circulation rate are respectively dimensionless converted to obtain dimensionless mass flow density, dimensionless pipeline diameter and dimensionless oil circulation rate; According to the liquid phase equivalent Reynolds number, the liquid phase equivalent Froude number, the dimensionless mass flow density, the dimensionless pipeline diameter, the dimensionless oil circulation rate and the preset dimensionless constant, a dimensionless lubricating oil retention amount is calculated; According to the dimensionless lubricating oil retention amount, the pipeline diameter, the pipeline length and the gas phase density, the lubricating oil retention amount in the target connecting pipeline is calculated.

6. The oil return control method of an air conditioner according to any one of claims 1 to 5, wherein The air conditioner comprises an air conditioner outdoor unit and at least one air conditioner indoor unit, the air conditioner outdoor unit comprises a compressor, and the air conditioner indoor unit is provided with an electronic expansion valve for controlling the refrigerant flow in the refrigerant pipeline. The control of the air conditioner to perform the oil return operation corresponding to the lubricating oil retention amount comprises: Adjusting at least one of the opening of the electronic expansion valve, the operating frequency of the compressor and the continuous operating time of the compressor according to the lubricating oil retention amount.

7. The oil return control method of claim 6, wherein, The adjustment amount of the lubricating oil retention amount, the opening of the electronic expansion valve, the operating frequency of the compressor and the continuous operating time of the compressor are all positively correlated.

8. An oil return control device of an air conditioner, characterized by comprising: The oil return control device of the air conditioner comprises: An acquisition module configured to acquire a pipeline parameter of a target connecting pipeline in the air conditioner; A prediction module configured to predict a lubricating oil retention amount in the target connecting pipeline based on the pipeline parameter through a preset lubricating oil distribution prediction model; An oil return module configured to control the air conditioner to perform an oil return operation corresponding to the lubricating oil retention amount.

9. An air conditioner characterized by comprising: The air conditioner comprises a memory, a processor and an air conditioner oil return control program stored in the memory and executable on the processor, and the air conditioner oil return control program is configured to implement the air conditioner oil return control method according to any one of claims 1 to 7.

10. A storage medium, characterized by The storage medium stores an air conditioner oil return control program, and the air conditioner oil return control program is executed by the processor to implement the air conditioner oil return control method according to any one of claims 1 to 7.

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