Control method of oil return system of fluorine pump double-cycle air conditioner and related device

Abstract

The application provides a control method and related device of a fluorine pump double-cycle air conditioner oil return system. The method comprises: when the exhaust volume of the compressor is less than the minimum exhaust volume, starting to calculate the oil discharge amount of the compressor according to the rotation speed, exhaust volume and exhaust superheat correction coefficient of the compressor according to a preset period; accumulating the oil discharge amount in each period; if the accumulated value of the oil discharge amount of the compressor is greater than the minimum oil discharge amount limit value, controlling the compressor to enter the oil return operation mode. Through the above method, the oil discharge amount can be calculated based on the exhaust volume of the compressor, and the compressor can be dynamically controlled to enter the oil return operation mode according to the amount of oil discharge, so as to avoid the situation that the compressor operates with insufficient oil, and prolong the service life of the compressor.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a control method and related device for a refrigerant pump dual-circulation air conditioning oil return system. Background Technology

[0002] Air conditioner compressors require sufficient oil to lubricate their internal components during operation. However, the compressor discharges refrigerant oil along with the exhaust gas. To ensure adequate oil levels for normal compressor operation, current technology typically uses an oil separator to separate the oil from the exhaust gas and return it to the compressor via a capillary tube. The theoretical separation efficiency of an oil separator is 99%. However, due to the longer piping required for high-rise buildings, a significant amount of oil adheres to the pipe walls. Therefore, air conditioners incorporate specific oil return procedures to carry the oil back to the compressor via high-speed airflow.

[0003] Normally, air conditioning systems enter an oil return mode after running for a period of time, returning lubricating oil to the compressor. However, existing air conditioning systems enter the oil return mode according to a fixed cycle. This control method may lead to the compressor running without oil due to an excessively long cycle, which in turn increases compressor power consumption, heat generation, and component wear, reducing the compressor's service life. Summary of the Invention

[0004] This application provides a control method and related device for a refrigerant pump dual-cycle air conditioning oil return system to solve the problem of compressor oil shortage caused by the air conditioner returning oil according to a fixed cycle.

[0005] In a first aspect, this application provides a control method for a refrigerant pump dual-cycle air conditioning oil return system, wherein the refrigerant pump dual-cycle air conditioning system includes a compressor, and the method includes:

[0006] Obtain the discharge volume of the compressor;

[0007] If the compressor's discharge volume is less than the minimum discharge volume, the oil discharge volume of the compressor will be calculated according to the compressor's speed, discharge volume, and discharge superheat correction coefficient according to a preset cycle.

[0008] The oil discharge amount in each cycle is accumulated; if the accumulated oil discharge amount of the compressor is greater than the minimum oil discharge limit, the compressor is controlled to enter the oil return operation mode.

[0009] Secondly, this application provides a control device for a refrigerant pump dual-cycle air conditioning oil return system, wherein the refrigerant pump dual-cycle air conditioning system includes a compressor, and the device includes:

[0010] Discharge volume acquisition module, used to acquire the discharge volume of the compressor;

[0011] The oil discharge calculation module is used to calculate the oil discharge of the compressor according to the compressor speed, discharge volume and discharge superheat correction coefficient at a preset cycle if the discharge volume of the compressor is less than the minimum discharge volume.

[0012] The oil return module is used to accumulate the amount of oil discharged in each cycle; if the accumulated value of the oil discharge of the compressor is greater than the minimum oil discharge limit, the compressor is controlled to enter the oil return operation mode.

[0013] Thirdly, this application provides a terminal including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described in any possible implementation of the first aspect above.

[0014] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in any possible implementation of the first aspect above.

[0015] This application provides a control method and related device for a refrigerant pump dual-cycle air conditioning oil return system. The method involves calculating the oil discharge rate of the compressor according to a preset cycle based on the compressor's speed, discharge rate, and discharge superheat correction coefficient when the compressor's discharge volume is less than the minimum discharge rate. The oil discharge rate is accumulated in each cycle. If the accumulated oil discharge rate exceeds the minimum oil discharge rate limit, the compressor is controlled to enter an oil return operation mode. This embodiment, through the above method, can calculate the oil discharge rate based on the compressor's discharge rate and dynamically control the compressor to enter the oil return operation mode according to the amount of oil discharged, thereby avoiding compressor operation due to oil shortage and extending the compressor's service life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart illustrating the implementation of the control method for the refrigerant pump dual-circulation air conditioning oil return system provided in this application embodiment;

[0018] Figure 2 This is a schematic diagram of the control device for the refrigerant pump dual-circulation air conditioning oil return system provided in the embodiments of this application;

[0019] Figure 3 This is a schematic diagram of the terminal provided in the embodiments of this application. Detailed Implementation

[0020] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0022] See Figure 1 The document illustrates a flowchart of the control method for the refrigerant pump dual-circulation air conditioning oil return system provided in this embodiment of the application, which is described in detail below:

[0023] S101: Obtain the discharge volume of the compressor;

[0024] S102: If the compressor's discharge volume is less than the minimum discharge volume, then the oil discharge volume of the compressor is calculated according to the compressor's speed, discharge volume, and discharge superheat correction coefficient according to a preset cycle.

[0025] S103: Accumulate the oil discharge amount in each cycle; if the accumulated value of the oil discharge amount of the compressor is greater than the minimum oil discharge limit, then control the compressor to enter the oil return operation mode.

[0026] The executing entity in this embodiment can be the air conditioning controller of a refrigerant pump dual-cycle air conditioner. A refrigerant pump dual-cycle air conditioner includes at least one compressor. The air conditioning controller can determine whether any compressor has entered the oil return operation mode based on parameters such as its discharge volume, speed, and discharge superheat.

[0027] Specifically, the air conditioning controller can initially estimate whether the compressor is running low on oil by measuring the compressor's discharge volume. If it is low on oil, it will then determine whether to enter the oil return operation mode by measuring the cumulative oil discharge volume. The oil discharge volume per unit cycle is the volume of cooling oil carried out by the compressor when it discharges gas within a unit cycle.

[0028] In one possible implementation, the specific implementation process of S101 includes:

[0029] Calculate the discharge capacity of the compressor based on its rated discharge capacity and rotational speed.

[0030] In this embodiment, the air conditioning controller obtains the rotational speed according to a preset sampling period, and multiplies the rated discharge capacity of the compressor with the rotational speed of the current sampling period to obtain the discharge capacity of the compressor in the current sampling period.

[0031] For example, if the compressor's rated displacement is 42 and the current sampling period's speed is 50, then the compressor's displacement in the current sampling period is 2100. If the compressor's minimum displacement is 2200, then the oil discharge rate is calculated.

[0032] In one possible implementation, the specific implementation process of S102 includes:

[0033] If the compressor's discharge capacity is less than the minimum discharge capacity and the compressor is in operation, then the oil discharge amount of the compressor is calculated according to the compressor's speed, discharge capacity, and discharge superheat correction coefficient at a preset cycle.

[0034] In one possible implementation, the specific implementation process of S102 includes:

[0035] The oil discharge rate of the compressor is calculated according to the oil discharge rate calculation formula, which is: wi=α·Li·ωi·(kωi+β)·KDSH i ;

[0036] Where wi represents the oil output in the i-th cycle, L i ωi represents the compressor discharge volume in the i-th cycle, and ωi represents the rotational speed in the i-th cycle. KDSH i The superheat correction factor for the exhaust gas in the i-th cycle is represented by α and β, where α and β are both coefficients.

[0037] In this embodiment, the formula for calculating the oil discharge volume can be as follows:

[0038] wi=Li×ωi×0.065×(0.0002×ωi+0.0045)×0.15×60 / 3600×1000 / 960×KDSH i

[0039] Among them, β=0.0045, k=0.0002, α=0.065×0.15×60 / 3600×1000 / 960.

[0040] Specifically, the preset cycle can be 60 seconds, meaning that the oil output is calculated every 60 seconds.

[0041] In one possible implementation, the method for calculating the exhaust superheat correction factor further includes:

[0042] Obtain the exhaust superheat of the compressor in the current cycle;

[0043] The discharge superheat correction factor of the compressor is determined based on the magnitude of the discharge superheat of the compressor in the current cycle.

[0044] In this embodiment, exhaust superheat is the temperature difference between the temperature of the compressor exhaust pipe or condenser inlet and the saturation temperature corresponding to the actual condensing pressure, and exhaust superheat is negatively correlated with the exhaust superheat correction coefficient.

[0045] Specifically, the air conditioning controller obtains the exhaust superheat from the last sample of the current cycle. If the exhaust superheat is detected to be less than the first temperature threshold, the exhaust superheat correction coefficient is determined to be the first correction coefficient. If the exhaust superheat is detected to be greater than or equal to the first temperature threshold and less than the second temperature threshold, the exhaust superheat correction coefficient is determined to be the second correction coefficient. If the exhaust superheat is greater than or equal to the second temperature threshold, the exhaust superheat correction coefficient is determined to be the third correction coefficient.

[0046] Among them, the first temperature threshold is less than the second temperature threshold, the first correction coefficient is greater than the second correction coefficient, and the second correction coefficient is greater than the third correction coefficient.

[0047] For example, the first temperature threshold is 10°C, the second temperature threshold is 15°C, the first correction factor is 1.5, the second correction factor is 1.2, and the third correction factor is 1.

[0048] In one possible implementation, after accumulating the oil output in each cycle, the method provided in this embodiment further includes:

[0049] If the duration of the compressor's discharge volume exceeding the minimum discharge volume exceeds a first preset threshold, the accumulated value of the compressor's oil discharge volume is reset to zero.

[0050] Specifically, if the compressor's discharge volume is found to be greater than the minimum discharge volume during the calculation of the cumulative value of oil discharge, and the duration of the above conditions being met is greater than the first preset threshold, then the cumulative value of the compressor's oil discharge is cleared to zero, and the compressor's oil discharge calculation process can be exited, returning to step S101 to be executed again.

[0051] Specifically, to avoid the compressor accidentally entering the oil return mode due to accidental underestimation of the exhaust volume caused by data collection errors or other unforeseen circumstances, this embodiment can promptly exit the oil return mode and enter the process when it is determined that the compressor's exhaust volume is greater than the minimum exhaust volume for a continuous period of time.

[0052] In one possible implementation, the specific implementation process of S103 includes:

[0053] If the cumulative value of the oil discharge of the compressor is greater than the minimum oil discharge limit, and the compressor is not in the start-up process, defrosting process, test mode, or trial operation process, and the cumulative time of oil return discharge is greater than the preset time, then the compressor is controlled to enter the oil return operation mode.

[0054] The cumulative time for oil return discharge is the time accumulated from the start moment of calculating the oil discharge of the compressor.

[0055] If the compressor is in the start-up process, defrosting process, test mode, or trial operation process, the oil return operation mode will not be controlled even if the cumulative value of oil discharge meets the corresponding conditions, so as to avoid the compressor frequently entering the oil return operation mode. At the same time, the compressor will only be controlled to enter the oil return operation mode when the cumulative time of oil discharge is greater than the preset time, in order to avoid the compressor frequently entering the oil return operation mode.

[0056] In this embodiment, if the cumulative value of the oil discharge of the compressor is greater than the minimum oil discharge limit, and the compressor is not in the start-up process, defrost process, test mode, or trial operation process, and the cumulative time of oil return discharge is greater than the preset duration, then the oil return flag is set, and the air conditioning controller controls the compressor to enter the oil return operation mode after the oil return flag is set.

[0057] The compressor startup process refers to the first ten minutes of operation after the compressor is turned on.

[0058] In one possible implementation, after S103, the method provided in this embodiment further includes:

[0059] The timing begins when the compressor enters the oil return operation mode. If the first timing duration is reached, the compressor is controlled to exit the oil return operation mode.

[0060] In this embodiment, the timing starts from when the compressor enters the oil return operation mode. If the first timing duration is reached, the oil return flag is reset. After the air conditioning controller detects that the oil return flag has been reset, it controls the compressor to exit the oil return operation mode.

[0061] In one possible implementation, if the cumulative value of the oil discharge from the compressor is greater than the minimum oil discharge limit, and the compressor is not in the start-up process, defrosting process, test mode, or trial operation process, and the cumulative time of oil return discharge is greater than a preset duration, but the time remaining until the oil return flag reset or the defrosting end time is less than a second preset duration, then the air conditioning controller controls the compressor to enter the oil return operation mode when it detects that the time remaining until the oil return flag reset or the defrosting end time has reached the second preset duration.

[0062] As can be seen from the above embodiments, since the compressor's discharge volume varies at different times, the amount of cooling oil carried out also varies. If the fixed-cycle oil return method in the prior art is adopted, oil shortage may occur. This embodiment dynamically controls the compressor to enter the oil return operation mode according to the discharge volume and oil discharge volume, which can avoid the situation of oil shortage operation, and at the same time, it can also avoid the compressor frequently entering the oil return operation mode, which will affect the refrigerant pump dual-cycle air conditioning refrigeration, ensure the safe and stable operation of the compressor, and extend the service life of the compressor.

[0063] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0064] The following are device embodiments of this application. For details not described in detail, please refer to the corresponding method embodiments described above.

[0065] Figure 2 A schematic diagram of the control device for the refrigerant pump dual-circulation air conditioning oil return system provided in an embodiment of this application is shown. For ease of explanation, only the parts related to the embodiment of this application are shown, and are described in detail below:

[0066] like Figure 2 As shown, the control device 100 of the refrigerant pump dual-circulation air conditioning oil return system includes:

[0067] The discharge volume acquisition module 110 is used to acquire the discharge volume of the compressor;

[0068] The oil discharge calculation module 120 is used to calculate the oil discharge of the compressor according to the compressor speed, discharge volume and discharge superheat correction coefficient according to a preset cycle if the discharge volume of the compressor is less than the minimum discharge volume.

[0069] The oil return module 130 is used to accumulate the oil discharge amount in each cycle; if the accumulated value of the oil discharge amount of the compressor is greater than the minimum oil discharge limit, the compressor is controlled to enter the oil return operation mode.

[0070] In one possible implementation, the oil discharge calculation module 120 includes:

[0071] If the compressor's discharge capacity is less than the minimum discharge capacity and the compressor is in operation, then the oil discharge amount of the compressor is calculated according to the compressor's speed, discharge capacity, and discharge superheat correction coefficient at a preset cycle.

[0072] In one possible implementation, the control device 100 for the refrigerant pump dual-cycle air conditioning oil return system further includes:

[0073] The cumulative value clearing module is used to clear the cumulative value of the oil discharge of the compressor to zero if the duration of the compressor's discharge volume being greater than the minimum discharge volume exceeds a first preset threshold.

[0074] In one possible implementation, the oil return module 130 includes:

[0075] If the cumulative value of the oil discharge of the compressor is greater than the minimum oil discharge limit, and the compressor is not in the start-up process, defrosting process, test mode, or trial operation process, and the cumulative time of oil return discharge is greater than the preset time, then the compressor is controlled to enter the oil return operation mode.

[0076] The cumulative time for oil return discharge is the time accumulated from the start moment of calculating the oil discharge of the compressor.

[0077] In one possible implementation, the exhaust volume acquisition module 110 includes:

[0078] Calculate the discharge capacity of the compressor based on its rated discharge capacity and rotational speed.

[0079] In one possible implementation, the oil discharge calculation module includes:

[0080] The oil discharge rate of the compressor is calculated according to the oil discharge rate calculation formula, which is: wi=α·Li·ωi·(kωi+β)·KDSH i ;

[0081] Where wi represents the oil output in the i-th cycle, L i ωi represents the compressor discharge volume in the i-th cycle, and ωi represents the rotational speed in the i-th cycle. KDSH i The superheat correction factor for the exhaust gas in the i-th cycle is represented by α and β, where α and β are both coefficients.

[0082] In one possible implementation, the control device 100 for the refrigerant pump dual-cycle air conditioning oil return system further includes:

[0083] The exit module is used to start timing from the time the compressor enters the oil return operation mode. If the first timing duration is reached, the module controls the compressor to exit the oil return operation mode.

[0084] As can be seen from the above embodiments, since the compressor's discharge volume varies at different times, the amount of cooling oil carried out also varies. If the fixed-cycle oil return method in the prior art is adopted, oil shortage may occur. This embodiment dynamically controls the compressor to enter the oil return operation mode according to the discharge volume and oil discharge volume, which can avoid the situation of oil shortage operation, and at the same time, it can also avoid the compressor frequently entering the oil return operation mode, which will affect the refrigerant pump dual-cycle air conditioning refrigeration, ensure the safe and stable operation of the compressor, and extend the service life of the compressor.

[0085] This application also provides a computer program product having program code. When this program code runs in a corresponding processor, controller, computing device, or terminal, it executes the steps in any of the above-described embodiments of the control method for a refrigerant pump dual-cycle air conditioning oil return system. For example... Figure 1 Steps S101 to S103 are shown. Those skilled in the art will understand that the methods and apparatus proposed in the embodiments of this application can be implemented in various forms, including hardware, software, firmware, dedicated processors, or combinations thereof. Dedicated processors may include application-specific integrated circuits (ASICs), reduced instruction set computers (RISCs), and / or field-programmable gate arrays (FPGAs). The proposed methods and apparatus are preferably implemented as a combination of hardware and software. The software is preferably installed as an application program on a program storage device. This is typically based on a machine with a computer platform, such as one or more central processing units (CPUs), random access memory (RAM), and one or more input / output (I / O) interfaces. An operating system is also typically installed on the computer platform. The various processes and functions described herein may be part of an application program, or a portion thereof may be executed by an operating system.

[0086] Figure 3 This is a schematic diagram of the terminal provided in an embodiment of this application. For example... Figure 3 As shown, the terminal 3 in this embodiment includes: a processor 30, a memory 31, and a computer program 32 stored in the memory 31 and executable on the processor 30. When the processor 30 executes the computer program 32, it implements the steps in the control method embodiments of the various refrigerant pump dual-cycle air conditioning oil return systems described above, for example... Figure 1 Steps S101 to S103 are shown. Alternatively, when the processor 30 executes the computer program 32, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 2 The functions of modules 110 to 130 are shown.

[0087] For example, the computer program 32 can be divided into one or more modules / units, which are stored in the memory 31 and executed by the processor 30 to complete / implement the solution provided in this application. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 32 in the terminal 3. For example, the computer program 32 can be divided into... Figure 2 Modules 110 to 130 are shown.

[0088] The terminal 3 may include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art will understand that... Figure 3 This is merely an example of terminal 3 and does not constitute a limitation on terminal 3. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal may also include input / output devices, network access devices, buses, etc.

[0089] The processor 30 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0090] The memory 31 can be an internal storage unit of the terminal 3, such as a hard disk or memory of the terminal 3. The memory 31 can also be an external storage device of the terminal 3, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the terminal 3. Furthermore, the memory 31 can include both internal storage units and external storage devices of the terminal 3. The memory 31 is used to store the computer program and other programs and data required by the terminal. The memory 31 can also be used to temporarily store data that has been output or will be output.

[0091] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0092] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0093] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0094] In the embodiments provided in this application, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0095] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0096] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0097] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above-described embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the control method embodiments for the various refrigerant pump dual-cycle air conditioning oil return systems described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately added to or subtracted from the content as required by the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium may not include electrical carrier signals and telecommunication signals.

[0098] Furthermore, the features of the embodiments shown in the accompanying drawings or the various embodiments mentioned in this specification should not be construed as independent embodiments. Rather, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the accompanying drawings.

[0099] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A control method for a refrigerant pump dual-circulation air conditioning oil return system, characterized in that, The refrigerant pump dual-cycle air conditioner includes a compressor, and the method includes: Obtain the discharge volume of the compressor; If the compressor's discharge volume is less than the minimum discharge volume, the oil discharge volume of the compressor will be calculated according to the compressor's speed, discharge volume, and discharge superheat correction coefficient according to a preset cycle. The oil discharge amount in each cycle is accumulated; if the accumulated oil discharge amount of the compressor is greater than the minimum oil discharge limit, the compressor is controlled to enter the oil return operation mode. The calculation method for the exhaust superheat correction factor includes: Obtain the exhaust superheat of the compressor in the current cycle; The exhaust superheat correction coefficient of the compressor is determined based on the magnitude of the exhaust superheat of the compressor in the current cycle; the exhaust superheat is negatively correlated with the exhaust superheat correction coefficient. The step of calculating the oil discharge volume of the compressor according to a preset cycle based on the compressor's speed, discharge volume, and discharge superheat correction coefficient includes: The oil discharge rate of the compressor is calculated according to the oil discharge rate calculation formula, which is as follows: ; in, Indicates the first i The amount of oil discharged per cycle L i Indicates the first i Compressor discharge volume per cycle, Indicates the first i The rotational speed of each cycle, Indicates the first i The exhaust superheat correction factor for each cycle, All are coefficients.

2. The control method for the refrigerant pump dual-circulation air conditioning oil return system according to claim 1, characterized in that, If the compressor's discharge capacity is less than the minimum discharge capacity, then the oil discharge amount of the compressor is calculated according to a preset cycle based on the compressor's speed, discharge capacity, and discharge superheat correction coefficient, including: If the compressor's discharge capacity is less than the minimum discharge capacity and the compressor is in operation, then the oil discharge amount of the compressor is calculated according to the compressor's speed, discharge capacity, and discharge superheat correction coefficient at a preset cycle.

3. The control method for the refrigerant pump dual-circulation air conditioning oil return system according to claim 1, characterized in that, After accumulating the oil output in each cycle, the method further includes: If the duration of the compressor's discharge volume exceeding the minimum discharge volume exceeds a first preset threshold, the accumulated value of the compressor's oil discharge volume is reset to zero.

4. The control method for the refrigerant pump dual-circulation air conditioning oil return system according to claim 1, characterized in that, If the cumulative value of the oil discharge from the compressor exceeds the minimum oil discharge limit, then controlling the compressor to enter the oil return operation mode includes: If the cumulative value of the oil discharge of the compressor is greater than the minimum oil discharge limit, and the compressor is not in the start-up process, defrosting process, test mode, or trial operation process, and the cumulative time of oil return discharge is greater than the preset time, then the compressor is controlled to enter the oil return operation mode. The cumulative time for the return oil discharge is the time accumulated from the start time of calculating the oil discharge of the compressor.

5. The control method for the refrigerant pump dual-circulation air conditioning oil return system according to claim 1, characterized in that, The step of obtaining the discharge capacity of the compressor includes: Calculate the discharge capacity of the compressor based on its rated discharge capacity and rotational speed.

6. The control method for the refrigerant pump dual-circulation air conditioning oil return system according to claim 1, characterized in that, After controlling the compressor to enter the oil return operation mode, the method further includes: The timing begins when the compressor enters the oil return operation mode. If the first timing duration is reached, the compressor is controlled to exit the oil return operation mode.

7. A control device for a refrigerant pump dual-circulation air conditioning oil return system of an energy storage system, characterized in that, The refrigerant pump dual-cycle air conditioner includes a compressor, and the device includes: Discharge volume acquisition module, used to acquire the discharge volume of the compressor; The oil discharge calculation module is used to calculate the oil discharge of the compressor according to the compressor speed, discharge volume and discharge superheat correction coefficient at a preset cycle if the discharge volume of the compressor is less than the minimum discharge volume. The oil return module is used to accumulate the oil discharge volume in each cycle; if the accumulated value of the oil discharge volume of the compressor is greater than the minimum oil discharge volume limit, the compressor is controlled to enter the oil return operation mode. The calculation method for the exhaust superheat correction coefficient in the oil discharge calculation module includes: Obtain the exhaust superheat of the compressor in the current cycle; The exhaust superheat correction coefficient of the compressor is determined based on the magnitude of the exhaust superheat of the compressor in the current cycle; the exhaust superheat is negatively correlated with the exhaust superheat correction coefficient. The oil output calculation module is specifically used for: The oil discharge rate of the compressor is calculated according to the oil discharge rate calculation formula, which is as follows: ; in, Indicates the first i The amount of oil discharged per cycle L i Indicates the first i Compressor discharge volume per cycle, Indicates the first i The rotational speed of each cycle, Indicates the first i The exhaust superheat correction factor for each cycle, All are coefficients.

8. A terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the control method for the refrigerant pump dual-cycle air conditioning oil return system as described in any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the refrigerant pump dual-circulation air conditioning oil return system as described in any one of claims 1 to 6.

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