An oil return flow path design method, device, storage medium and equipment

Abstract

The embodiments of the present application provide a method, device, storage medium and equipment for designing an oil return flow channel. In this method, the initial designed oil return flow channel is a cylindrical flow channel. The diameter of the initial oil return flow channel is calculated according to the length of the initial oil return flow channel, the height difference from the lowest point of the motor rotor to the liquid level on the difference reduction side, the oil flow demand and the oil product parameters. When the specified oil return flow channel is not a cylindrical flow channel, based on the cross-sectional area and wetted perimeter of the specified oil return flow channel, and the diameter of the initial oil return flow channel, it is judged whether the specified oil return flow channel meets the design conditions. If not, the shape parameters of the specified oil return flow channel are modified according to the preset adjustment rules, and the checking and correction are repeated until the design conditions are met. In this way, on the premise of ensuring that the calculation accuracy meets the requirements of engineering applications, the number of calculations of three-dimensional CFD analysis is reduced, and the design efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of electric drive systems. Specifically, it relates to a method, device, storage medium, and equipment for designing an oil return flow channel. Background Art

[0002] Oil-cooled electric drive, that is, an electric drive system in which a special motor uses an oil-cooling method, as an important development direction of current electric drive systems, has the advantages of high power density, high torque density, small size, and compact structure. The oil return flow channel can drain the oil at the back of the motor to the bottom of the housing and is an important part of the oil-cooled electric drive. Currently, the method for designing the oil return flow channel is usually in the detailed design stage of the oil-cooled electric drive digital model. First, based on past experience, the oil return flow channel is roughly drawn, and then the oil return situation of the oil-cooled electric drive is calculated through three-dimensional CFD simulation analysis. If too much oil accumulates at the back of the motor and submerges the motor rotor, the diameter of the oil return flow channel is enlarged to accelerate the drainage of the oil at the back of the motor. Such modifications and simulations are carried out until the oil level accumulated at the back of the motor is lower than the lowest point of the motor rotor. However, this method often requires multiple rounds of analysis to obtain a flow channel that meets the requirements. Due to the low efficiency of three-dimensional CFD analysis, a general plan requires several days of simulation time, which is inefficient and the obtained design is often not in an optimal state. Summary of the Invention

[0003] The purpose of the embodiments of this application is to provide a method, device, storage medium, and equipment for designing an oil return flow channel, aiming to solve the problems of low efficiency and the obtained design often not being in an optimal state in the related art for the design method of the oil return flow channel.

[0004] In a first aspect, a method for designing an oil return flow channel provided by the embodiments of this application includes:

[0005] Obtain an initial parameter set, and calculate the diameter of the initial oil return flow channel according to the initial parameter set; the initial parameter set is obtained based on the design model of the oil-cooled electric drive and includes the length of the initial oil return flow channel, the height difference between the lowest point of the motor rotor and the liquid level on the subtraction side, the oil flow demand, and the oil product parameters, and calculate the diameter of the initial oil return flow channel; the initial oil return flow channel is a cylindrical flow channel;

[0006] When the specified oil return flow channel is not a cylindrical flow channel, iteratively execute a verification and correction process. In the verification and correction process, based on the cross-sectional area and wetted perimeter of the specified oil return flow channel, and the diameter of the initial oil return flow channel, determine whether the specified oil return flow channel meets the design conditions. If the determination result is no, modify the shape parameters of the specified oil return flow channel according to a preset adjustment rule; the specified oil return flow channel is obtained based on the position layout constrained by the design model;

[0007] When the determination result is yes, stop the iteration and output the shape parameters of the current specified oil return flow channel.

[0008] In the above implementation process, the initial designed oil return flow channel is a cylindrical flow channel. The diameter of the initial oil return flow channel is calculated based on the length of the initial oil return flow channel, the height difference between the lowest point of the motor rotor and the liquid level on the differential reduction side, the oil flow demand, and the oil product parameters. When the specified oil return flow channel is not a cylindrical flow channel, based on the cross-sectional area and wetted perimeter of the specified oil return flow channel, and the diameter of the initial oil return flow channel, it is determined whether the specified oil return flow channel meets the design conditions. If not, the shape parameters of the specified oil return flow channel are modified according to the preset adjustment rules, and the checking and correction are repeated until the design conditions are met. In this way, on the premise of ensuring that the calculation accuracy meets the requirements of engineering applications, the number of calculations of three-dimensional CFD analysis is reduced, and the design efficiency is improved.

[0009] Further, in some embodiments, calculating the diameter of the initial oil return flow channel according to the initial parameter set includes:

[0010] Based on the length of the initial oil return flow channel, the height difference between the lowest point of the motor rotor and the liquid level on the differential reduction side, the oil flow demand, and the oil product parameters, calculate the oil return velocity;

[0011] Using the oil return velocity and the oil flow demand, calculate the diameter of the initial oil return flow channel.

[0012] In the above implementation process, a specific method for calculating the diameter of the initial oil return flow channel is provided, that is, first calculate the oil return velocity in the initial oil return flow channel using the parameters in the initial parameter set, and then calculate the diameter of the oil return flow channel using the oil return velocity and the oil flow demand.

[0013] Further, in some embodiments, the oil product parameters include oil viscosity and density; the oil return velocity is calculated based on the following formula:

[0014]

[0015] In the formula, V is the oil return velocity; L is the length of the initial oil return flow channel; H is the height difference between the lowest point of the motor rotor and the liquid level on the differential reduction side; Q is the oil flow demand; ρ is the density; μ is the oil viscosity;

[0016] The diameter of the initial oil return flow channel is calculated based on the following formula:

[0017]

[0018] In the formula, d is the diameter of the initial oil return flow channel.

[0019] In the above implementation process, with the aid of fluid mechanics technology, the diameter of the initial oil return flow channel is calculated.

[0020] Further, in some embodiments, determining whether the specified oil return channel meets the design conditions based on the cross-sectional area and wetted perimeter of the specified oil return channel, and the diameter of the initial oil return channel includes:

[0021] Calculating the hydraulic diameter of the specified oil return channel based on the cross-sectional area and wetted perimeter of the specified oil return channel;

[0022] Determining whether the specified oil return channel meets the design requirements by comparing the hydraulic diameter of the specified oil return channel with the diameter of the initial oil return channel, and by comparing the cross-sectional area of the specified oil return channel with the cross-sectional area of the initial oil return channel.

[0023] In the above implementation process, a specific implementation manner for determining whether the specified oil return channel meets the design conditions is provided.

[0024] Further, in some embodiments, determining whether the specified oil return channel meets the design requirements by comparing the hydraulic diameter of the specified oil return channel with the diameter of the initial oil return channel, and by comparing the cross-sectional area of the specified oil return channel with the cross-sectional area of the initial oil return channel includes:

[0025] If the hydraulic diameter of the specified oil return channel is greater than or equal to the diameter of the initial oil return channel, and the cross-sectional area of the specified oil return channel is greater than or equal to the cross-sectional area of the initial oil return channel, it is determined that the specified oil return channel meets the design requirements.

[0026] In the above implementation process, only when the specified oil return channel simultaneously meets the conditions that the hydraulic diameter is greater than or equal to the diameter of the initial oil return channel and the cross-sectional area is greater than or equal to the cross-sectional area of the initial oil return channel, it is considered that the specified oil return channel can meet the requirements. In this way, it is possible to avoid the problem of excessive oil accumulation on the back of the motor due to insufficient hydraulic diameter or cross-sectional area of the finally designed oil return channel.

[0027] Further, in some embodiments, modifying the shape parameters of the specified oil return channel according to the preset adjustment rule includes:

[0028] Modifying the cross-sectional shape of the specified oil return channel, and / or magnifying the cross-section of the specified oil return channel according to a preset ratio.

[0029] In the above implementation process, by iteratively correcting the cross-sectional shape and / or area of the oil return channel, an oil return channel that meets the design requirements can be quickly obtained, improving the design efficiency.

[0030] Further, in some embodiments, the method further includes:

[0031] When the number of iterations is greater than or equal to a preset number threshold, or when the cross-sectional area of the current specified oil return channel is greater than or equal to a preset area threshold, stop the iteration and output an alarm message.

[0032] In the above implementation process, adding the condition that the number of iterations is greater than or equal to a preset number threshold, or the cross-sectional area of the current specified oil return channel is greater than or equal to a preset area threshold as the iteration end condition can reduce the waste of computing resources and improve the design efficiency.

[0033] In a second aspect, an oil return channel design device provided by an embodiment of the present application includes:

[0034] A calculation module, configured to obtain an initial parameter set and calculate the diameter of an initial oil return channel according to the initial parameter set; the initial parameter set is obtained based on a design model of an oil-cooled electric drive and includes the length of the initial oil return channel, the height difference between the lowest point of the motor rotor and the liquid level on the subtraction side, the oil flow demand, and oil product parameters, and calculate the diameter of the initial oil return channel; the initial oil return channel is a cylindrical channel;

[0035] An iteration module, configured to iteratively execute a verification and correction process when the specified oil return channel is not a cylindrical channel. In the verification and correction process, based on the cross-sectional area and wetted perimeter of the specified oil return channel, and the diameter of the initial oil return channel, determine whether the specified oil return channel meets the design conditions. If the determination result is no, modify the shape parameters of the specified oil return channel according to a preset adjustment rule; the specified oil return channel is obtained based on a position layout constrained by the design model;

[0036] An output module, configured to stop the iteration and output the shape parameters of the current specified oil return channel when the determination result is yes.

[0037] In a third aspect, an electronic device provided by an embodiment of the present application includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method according to any one of the first aspects are implemented.

[0038] In a fourth aspect, a computer-readable storage medium provided by an embodiment of the present application has instructions stored thereon. When the instructions are run on a computer, the computer is made to execute the method according to any one of the first aspects.

[0039] In a fifth aspect, a computer program product provided by an embodiment of the present application, when run on a computer, causes the computer to execute the method according to any one of the first aspects.

[0040] Other features and advantages disclosed in this application will be described in the subsequent specification, or some features and advantages can be inferred from the specification or determined without doubt, or can be learned by implementing the above technologies disclosed in this application.

[0041] To make the above objects, features, and advantages of this application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, provides a detailed description as follows. Brief Description of the Drawings

[0042] To more clearly illustrate the technical solutions in the embodiments of this application, the following briefly introduces the drawings required to be used in the embodiments of this application. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0043] Figure 1 It is a flowchart of a method for designing an oil return flow channel provided in an embodiment of this application;

[0044] Figure 2 It is a schematic diagram of the process of a method for designing an oil return flow channel of an oil-cooled electric drive provided in an embodiment of this application;

[0045] Figure 3 It is a block diagram of a device for designing an oil return flow channel provided in an embodiment of this application;

[0046] Figure 4 It is a block diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Embodiments

[0047] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application.

[0048] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, terms such as "first" and "second" are only used for differential description and cannot be understood as indicating or implying relative importance.

[0049] As described in the background art section, in the related art, there are problems with the design method for the oil return flow channel, such as inefficiency and the obtained design often not being in an optimal state. Based on this, the embodiments of this application provide an oil return flow channel design solution to solve the above problems.

[0050] Next, the embodiments of this application will be introduced:

[0051] As Figure 1 shownFigure 1 It is a flowchart of a method for designing an oil return flow channel provided by an embodiment of the present application. The method can be applied to a terminal or a server. The terminal can be various electronic devices, including but not limited to smartphones, tablets, laptop portable computers, desktop computers, etc.; the server can be a single server or a distributed server cluster composed of multiple servers. The terminal or the server provides an environment for designing the oil return flow channel, which includes a software part and a hardware part. Among them, the software part mainly includes operating systems such as Windows, Linux, etc., and the hardware part mainly includes computing resources, storage resources, etc., such as CPU (Central Processing Unit), memory, hard disk, etc. It should be noted that the terminal / server can also be implemented as multiple software or software modules, or can also be implemented as a single software or software module, and the present application does not limit this.

[0052] The method includes:

[0053] In step 101, obtain an initial parameter set, and calculate the diameter of the initial oil return flow channel according to the initial parameter set; the initial parameter set is obtained based on the design model of the oil-cooled electric drive, and includes the length of the initial oil return flow channel, the height difference between the lowest point of the motor rotor and the liquid level on the differential reduction side, the oil flow demand, and the oil product parameters, and calculate the diameter of the initial oil return flow channel; the initial oil return flow channel is a cylindrical flow channel;

[0054] The initial oil return flow channel mentioned in this step is a flow channel designed by assumption. The initial oil return flow channel is a cylindrical flow channel, that is to say, each cross-section of the initial oil return flow channel is circular. Compared with the initial designed oil return flow channel being a flow channel of other shapes, it is more convenient for calculating the parameters required in the subsequent steps, and thus is also convenient for checking and correction in the subsequent steps.

[0055] In this initial parameter set, the length of the initial oil return flow channel and the height difference between the lowest point of the motor rotor and the liquid level on the differential reduction side can be measured from the design model of the oil-cooled electric drive; the oil flow demand is the oil flow rate that needs to return to the differential reduction side through the oil return flow channel at the rear of the motor, and the oil product parameters are the characteristic parameters of the cooling oil used in the oil-cooled electric drive. The project developer uses the oil flow demand and the oil product parameters as two of the development indicators to create the design model of the oil-cooled electric drive. In this embodiment, the initial oil return flow channel is a flow channel designed by assumption, which meets the requirement of being able to completely discharge the oil liquid on the back of the motor. Therefore, based on the parameters in this initial parameter set, the diameter of the initial oil return flow channel can be calculated according to fluid mechanics technology.

[0056] In some embodiments, calculating the diameter of the initial oil return channel according to the initial parameter set mentioned in this step may include: calculating the oil return speed based on the length of the initial oil return channel, the height difference between the lowest point of the motor rotor and the liquid level on the subtraction side, the oil flow demand, and the oil product parameters; and calculating the diameter of the initial oil return channel by using the oil return speed and the oil flow demand. That is to say, first calculate the oil return speed in the initial oil return channel by using the parameters in the initial parameter set, and then calculate the diameter of the oil return channel by using the oil return speed and the oil flow demand.

[0057] Specifically, the oil product parameters may include oil viscosity and density, and the oil return speed can be calculated based on the following formula:

[0058]

[0059] In the formula, V is the oil return speed; L is the length of the initial oil return channel; H is the height difference between the lowest point of the motor rotor and the liquid level on the subtraction side; Q is the oil flow demand; ρ is the density; μ is the oil viscosity; in fluid mechanics technology, the flow rate can be calculated by the product of the cross-sectional area of the pipe and the flow velocity. Since the initial oil return channel is a cylindrical channel, the area of its cross-section can be represented by the diameter of the initial oil return channel. Therefore, the diameter of the initial oil return channel can be calculated based on the following formula:

[0060]

[0061] In the formula, d is the diameter of the initial oil return channel.

[0062] Of course, in other embodiments, the diameter of the initial oil return channel can also be calculated by other methods, and this application does not limit this.

[0063] In step 102, when the specified oil return channel is not a cylindrical channel, the verification and correction process is iteratively executed. In the verification and correction process, based on the cross-sectional area and wetted perimeter of the specified oil return channel, and the diameter of the initial oil return channel, it is judged whether the specified oil return channel meets the design conditions. If the judgment result is no, the shape parameters of the specified oil return channel are modified according to the preset adjustment rules; the specified oil return channel is obtained based on the position layout constrained by the design model.

[0064] The specified oil return channel mentioned in this step is obtained based on the position layout constrained by the design model of the oil-cooled electric drive. That is to say, this specified oil return channel is actually an oil return channel obtained based on the position layout reserved for the oil return channel by the project developer in the design model of the oil-cooled electric drive, and it is often not in the optimal state. Therefore, it is necessary to verify and correct it to obtain an oil return channel in the optimal state that can meet the requirements.

[0065] If the specified oil return channel is a cylindrical channel, the diameter of the specified oil return channel can be directly adjusted to the diameter of the initial oil return channel obtained from the previous calculation, and the calculation can be terminated. That is to say, the oil return channel designed at this time is the initial oil return channel, which can meet the design requirements.

[0066] Considering that in most scenarios, the finally selected oil return channel is not cylindrical, therefore, in this embodiment, the design requirements of the oil return channel are achieved by iteratively executing the correction process. Specifically, the cross-sectional area and wetted perimeter of the specified oil return channel mentioned in this step can also be obtained according to the position layout. It should be noted that since whether the oil return channel can meet the requirements often depends on the minimum cross-section of the oil return channel, the cross-sectional area and wetted perimeter here can be the area and wetted perimeter of the minimum cross-section of the specified oil return channel, and both of these parameter values and the initial parameter set can be obtained from the design end of the project developer.

[0067] In some embodiments, based on the cross-sectional area and wetted perimeter of the specified oil return channel, the hydraulic diameter of the specified oil return channel can be calculated. By comparing the hydraulic diameter of the specified oil return channel with the diameter of the initial oil return channel, and comparing the cross-sectional area of the specified oil return channel with the cross-sectional area of the initial oil return channel, it can be determined whether the specified oil return channel meets the design conditions. Specifically, the hydraulic diameter of the specified oil return channel can be calculated based on the following formula: D = 4A / S, where D is the hydraulic diameter of the specified oil return channel, A is the cross-sectional area of the specified oil return channel, and S is the wetted perimeter of the specified oil return channel. After calculating the hydraulic diameter, the hydraulic diameter of the specified oil return channel and the diameter of the initial oil return channel, as well as the cross-sectional area of the specified oil return channel and the cross-sectional area of the initial oil return channel, can be compared simultaneously to determine whether the specified oil return channel can meet the requirements.

[0068] Specifically, the judgment criteria can include: if the hydraulic diameter of the specified oil return channel is greater than or equal to the diameter of the initial oil return channel, and the cross-sectional area of the specified oil return channel is greater than or equal to the cross-sectional area of the initial oil return channel, it is determined that the specified oil return channel meets the design requirements. That is to say, only when the specified oil return channel simultaneously meets the conditions that the hydraulic diameter is greater than or equal to the diameter of the initial oil return channel and the cross-sectional area is greater than or equal to the cross-sectional area of the initial oil return channel, is it considered that the specified oil return channel can meet the requirements. In this way, it is possible to avoid the problem of excessive oil accumulation on the back of the motor due to insufficient hydraulic diameter or cross-sectional area of the finally designed oil return channel.

[0069] When the specified oil return channel does not meet the design conditions, modify the shape parameters of the specified oil return channel according to the preset adjustment rules. Recalculate the cross-sectional area and wetted perimeter for the modified specified oil return channel, and then make another judgment. Repeat this iterative process until the iteration end condition is met. In some embodiments, modifying the shape parameters of the specified oil return channel according to the preset adjustment rules mentioned in this step may include: modifying the cross-sectional shape of the specified oil return channel, and / or enlarging the cross-section of the specified oil return channel by a preset ratio. Modifying the cross-sectional shape mentioned here may include stretching, shrinking, etc. all or part of the lines of the cross-section of the specified oil return channel. For example, adjusting a cross-section originally in the shape of a square to a rectangle with a length-width ratio equal to a preset value. Enlarging the cross-section of the specified oil return channel by a preset ratio mentioned here means increasing the cross-sectional area without changing the cross-sectional shape. Optionally, the preset ratio may be 110%. By iteratively correcting the cross-sectional shape and / or area of the oil return channel, an oil return channel that meets the design requirements can be quickly obtained, improving the design efficiency.

[0070] In step 103, when the judgment result is yes, stop the iteration and output the shape parameters of the current specified oil return channel.

[0071] When the current specified oil return channel meets the design conditions, stop the iteration and output its shape parameters. The shape parameters here may include the cross-sectional shape and / or area, etc. In this way, project developers can perform three-dimensional CFD simulation verification based on these shape parameters to complete the design. Different from the related art that requires repeating three-dimensional CFD simulation verification multiple times, the solution of this embodiment only requires one three-dimensional CFD simulation verification, greatly improving the design efficiency and shortening the design cycle.

[0072] In some embodiments, the above method may further include: when the number of iterations is greater than or equal to a preset number threshold, or when the cross-sectional area of the current specified oil return channel is greater than or equal to a preset area threshold, stop the iteration and output an alarm message. That is to say, the iteration end condition may also include that the number of iterations is greater than or equal to a preset number threshold, or the cross-sectional area of the current specified oil return channel is greater than or equal to a preset area threshold. Taking the modification of the shape parameter of the specified oil return channel as an example of magnifying the cross-section of the specified oil return channel according to a preset ratio, when the number of iterations is greater than or equal to the preset number threshold, it indicates that the specified oil return channel has been magnified proportionally several times, and the current specified oil return channel is very likely to exceed the constraints of the design model. Therefore, the iteration can be stopped and an alarm message can be output, so that project developers can modify the design model of the oil-cooled electric drive according to this alarm message to reserve more space to accommodate the oil return channel; similarly, when the cross-sectional area of the current specified oil return channel is greater than or equal to the preset area threshold, it also indicates that the current specified oil return channel has exceeded the constraints of the design model. Therefore, the iteration can also be stopped and an alarm message can be output. In this way, the waste of computing resources can be reduced and the design efficiency can be improved. It should be noted that the preset number threshold and the preset area threshold here can be set according to the requirements of specific scenarios, and the present application does not limit this.

[0073] In the embodiment of the present application, the initial designed oil return channel is a cylindrical channel. The diameter of the initial oil return channel is calculated according to the length of the initial oil return channel, the height difference between the lowest point of the motor rotor and the liquid level on the differential side, the oil flow demand, and the oil product parameters. When the specified oil return channel is not a cylindrical channel, based on the cross-sectional area and wetted perimeter of the specified oil return channel, and the diameter of the initial oil return channel, it is judged whether the specified oil return channel meets the design conditions. If not, the shape parameters of the specified oil return channel are modified according to the preset adjustment rules, and the checking and correction are repeated until the design conditions are met. In this way, on the premise of ensuring that the calculation accuracy meets the requirements of engineering applications, the number of three-dimensional CFD analyses is reduced and the design efficiency is improved.

[0074] To make a more detailed description of the oil return channel design scheme of the oil-cooled electric drive of the present application, a specific embodiment will be introduced next:

[0075] As Figure 2 shown, Figure 2 is a schematic diagram of the flow of a method for designing an oil return channel of an oil-cooled electric drive provided by an embodiment of the present application. The flow includes:

[0076] S201. Initially design the oil return channel as a cylindrical channel, and obtain the length L of the cylindrical channel, the height difference H between the lowest point of the rotor and the liquid level on the differential side, the oil flow rate Q that needs to return to the differential side through the oil return channel at the rear of the motor, and the oil product parameters, including oil viscosity μ and density ρ;

[0077] S202. Calculate the oil return velocity V in the flow channel using the parameters mentioned in S201:

[0078] S203. Calculate the oil return flow channel diameter d using the oil return velocity V and the oil flow rate Q:

[0079] S204. According to the position layout of the oil return flow channel (including the shape of the oil return flow channel, the area A of the cross-section of the oil return flow channel, the wetted perimeter S of the oil return flow channel, etc.), determine whether the oil return flow channel is selected as a cylindrical shape. If so, execute S208. At this time, the diameter of the oil return flow channel is equal to d; if the oil return flow channel is not selected as a cylindrical shape, iteratively execute S205 to S207;

[0080] S205. Calculate the hydraulic diameter D of the oil return flow channel using the area A of the cross-section of the oil return flow channel and the wetted perimeter S of the oil return flow channel;

[0081] S206. If D ≥ d and A ≥ 0.25πd 2 , it is considered that the oil return flow channel can meet the requirements, and the iteration ends. Otherwise, execute S207;

[0082] S207. Modify the shape of the oil return flow channel and / or increase the area, and return to S205;

[0083] S208. The design is completed.

[0084] The solution of the embodiment of the present application uses the theoretical knowledge of fluid mechanics to construct a set of methods for calculating the oil return flow channel of a common oil-cooled electric drive, changing the current iterative method of "design by experience -> three-dimensional CFD simulation verification -> design modification -> three-dimensional CFD simulation verification" to the design process of "theoretical calculation -> flow channel design -> three-dimensional CFD simulation verification", greatly improving the design efficiency and shortening the design cycle.

[0085] Corresponding to the embodiment of the foregoing method, the present application also provides an embodiment of an oil return flow channel design device and a terminal to which it is applied:

[0086] As Figure 3 shown, Figure 3 is a block diagram of an oil return flow channel design device provided by an embodiment of the present application. The device includes:

[0087] A calculation module 31, configured to obtain an initial parameter set and calculate the diameter of an initial oil return flow channel according to the initial parameter set; the initial parameter set is obtained based on a design model of an oil-cooled electric drive and includes the length of the initial oil return flow channel, the height difference between the lowest point of the motor rotor and the liquid level on the differential side, the oil flow demand, and the oil product parameters, and calculate the diameter of the initial oil return flow channel; the initial oil return flow channel is a cylindrical flow channel;

[0088] An iterative module 32 is configured to iteratively execute a verification and correction process when the specified oil return flow channel is not a cylindrical flow channel. In the verification and correction process, based on the cross-sectional area and wetted perimeter of the specified oil return flow channel, and the diameter of the initial oil return flow channel, it is determined whether the specified oil return flow channel meets the design conditions. If the determination result is negative, the shape parameters of the specified oil return flow channel are modified according to a preset adjustment rule; the specified oil return flow channel is obtained based on the position layout constrained by the design model.

[0089] An output module 33 is configured to stop the iteration and output the shape parameters of the current specified oil return flow channel when the determination result is positive.

[0090] For the implementation processes of the functions and roles of each module in the above device, please refer to the implementation processes of the corresponding steps in the above method for details and will not be elaborated here.

[0091] This application also provides an electronic device. Please refer to Figure 4 , Figure 4 which is a structural block diagram of an electronic device provided by an embodiment of this application. The electronic device may include a processor 410, a communication interface 420, a memory 430, and at least one communication bus 440. Among them, the communication bus 440 is used to realize the direct connection and communication of these components. Among them, the communication interface 420 of the electronic device in the embodiment of this application is used to communicate signaling or data with other node devices. The processor 410 may be an integrated circuit chip with signal processing capabilities.

[0092] The above-mentioned processor 410 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or the processor 410 may also be any conventional processor, etc.

[0093] The memory 430 may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read - only memory (PROM), an erasable programmable read - only memory (EPROM), an electrically erasable programmable read - only memory (EEPROM), etc. Computer - readable instructions are stored in the memory 430. When the computer - readable instructions are executed by the processor 410, the electronic device can perform each of the steps involved in the above Figure 1 method embodiments.

[0094] Optionally, the electronic device may further include a storage controller and an input / output unit.

[0095] The memory 430, the storage controller, the processor 410, the peripheral interface, and the input / output unit are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses 440. The processor 410 is used to execute the executable modules stored in the memory 430, such as software function modules or computer programs included in the electronic device.

[0096] The input / output unit is used to provide the user with the creation of tasks and the creation of an optional start time period or a preset execution time for the task to realize the interaction between the user and the server. The input / output unit may be, but is not limited to, a mouse, a keyboard, etc.

[0097] It can be understood that Figure 4 the structure shown is only schematic, and the electronic device may further include more or fewer components than those shown in Figure 4 it, or have a configuration different from that shown in Figure 4 it. Figure 4 Each of the components shown in it can be implemented by hardware, software, or a combination thereof.

[0098] The embodiment of the present application also provides a storage medium. Instructions are stored on the storage medium. When the instructions run on a computer, the computer program, when executed by the processor, implements the method described in the method embodiment. To avoid repetition, it will not be elaborated here.

[0099] The present application also provides a computer program product. When the computer program product runs on a computer, it causes the computer to execute the method described in the method embodiment.

[0100] In several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of this application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0101] In addition, each functional module in various embodiments of this application may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.

[0102] If the described functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0103] The above are only embodiments of the present application and are not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0104] As described above, the above are only specific implementation manners of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, and all of them should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

[0105] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A method for designing an oil return flow path, characterized in that, Including: Obtain an initial parameter set, and calculate the diameter of the initial oil return flow channel according to the initial parameter set; The initial parameter set is obtained based on the design model of the oil-cooled electric drive, and includes the length of the initial oil return flow channel, the height difference from the lowest point of the motor rotor to the liquid level on the differential side, the oil flow demand, and the oil product parameters; the initial oil return flow channel is a cylindrical flow channel; When the specified oil return flow channel is not a cylindrical flow channel, iteratively execute a verification and correction process. In the verification and correction process, based on the cross-sectional area and wetted perimeter of the specified oil return flow channel, and the diameter of the initial oil return flow channel, determine whether the specified oil return flow channel meets the design conditions. If the determination result is no, modify the shape parameters of the specified oil return flow channel according to a preset adjustment rule; the specified oil return flow channel is obtained based on the position layout constrained by the design model; When the determination result is yes, stop the iteration and output the shape parameters of the current specified oil return flow channel; Wherein, calculating the diameter of the initial oil return flow channel according to the initial parameter set includes: Calculate the oil return velocity based on the length of the initial oil return flow channel, the height difference from the lowest point of the motor rotor to the liquid level on the differential side, the oil flow demand, and the oil product parameters; Use the oil return velocity and the oil flow demand to calculate the diameter of the initial oil return flow channel; Determining whether the specified oil return flow channel meets the design conditions based on the cross-sectional area and wetted perimeter of the specified oil return flow channel, and the diameter of the initial oil return flow channel includes: Calculate the hydraulic diameter of the specified oil return flow channel based on the cross-sectional area and wetted perimeter of the specified oil return flow channel; Judge whether the specified oil return flow channel meets the design requirements by comparing the hydraulic diameter of the specified oil return flow channel with the diameter of the initial oil return flow channel, and by comparing the cross-sectional area of the specified oil return flow channel with the cross-sectional area of the initial oil return flow channel.

2. The method according to claim 1, wherein The oil product parameters include oil viscosity and density; the oil return velocity is calculated based on the following formula: In the formula, the is the oil return speed; the is the length of the initial oil return flow path; the is the height difference from the lowest point of the motor rotor to the liquid level on the differential reduction side; the is the oil flow demand; the is the density; the is the oil viscosity; The diameter of the initial oil return flow channel is calculated based on the following formula: In the formula, the is the diameter of the initial oil return flow channel.

3. The method according to claim 1, wherein Determining whether the specified oil return flow channel meets the design requirements by comparing the hydraulic diameter of the specified oil return flow channel with the diameter of the initial oil return flow channel, and by comparing the cross-sectional area of the specified oil return flow channel with the cross-sectional area of the initial oil return flow channel includes: If the hydraulic diameter of the specified oil return flow channel is greater than or equal to the diameter of the initial oil return flow channel, and the cross-sectional area of the specified oil return flow channel is greater than or equal to the cross-sectional area of the initial oil return flow channel, it is determined that the specified oil return flow channel meets the design requirements.

4. The method according to claim 1, wherein Modifying the shape parameters of the specified oil return flow channel according to the preset adjustment rule includes: Modify the cross-sectional shape of the specified oil return flow channel, and / or, enlarge the cross-section of the specified oil return flow channel according to a preset ratio.

5. The method according to claim 1, characterized in that The method further includes: When the number of iterations is greater than or equal to a preset number threshold, or the cross-sectional area of the current specified oil return flow channel is greater than or equal to a preset area threshold, stop the iteration and output an alarm message.

6. An oil return flow path design device, characterized in that, Including: A calculation module, configured to obtain an initial parameter set and calculate the diameter of the initial oil return flow channel according to the initial parameter set; The initial parameter set is obtained based on the design model of the oil-cooled electric drive, and includes the length of the initial oil return flow channel, the height difference from the lowest point of the motor rotor to the liquid level on the differential reduction side, the oil flow demand, and the oil product parameters, and calculates the diameter of the initial oil return flow channel; the initial oil return flow channel is a cylindrical flow channel; An iteration module is used to iteratively execute a verification and correction process when the specified oil return flow channel is not a cylindrical flow channel. In the verification and correction process, based on the cross-sectional area and wetted perimeter of the specified oil return flow channel, and the diameter of the initial oil return flow channel, it is judged whether the specified oil return flow channel meets the design conditions. If the judgment result is no, the shape parameters of the specified oil return flow channel are modified according to a preset adjustment rule; the specified oil return flow channel is obtained based on the position layout constrained by the design model; An output module is used to stop the iteration and output the shape parameters of the current specified oil return flow channel when the judgment result is yes; The calculation module is specifically used for: calculating the oil return velocity based on the length of the initial oil return flow channel, the height difference from the lowest point of the motor rotor to the liquid level on the differential reduction side, the oil flow demand, and the oil product parameters; and calculating the diameter of the initial oil return flow channel by using the oil return velocity and the oil flow demand; The iteration module is specifically used for: calculating the hydraulic diameter of the specified oil return flow channel based on the cross-sectional area and wetted perimeter of the specified oil return flow channel; and judging whether the specified oil return flow channel meets the design requirements by comparing the hydraulic diameter of the specified oil return flow channel with the diameter of the initial oil return flow channel, and comparing the cross-sectional area of the specified oil return flow channel with the cross-sectional area of the initial oil return flow channel.

7. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed by a processor, the method described in any one of claims 1 to 5 is implemented.

8. A computer device, characterized in that, It includes a processor, a memory, and a computer program stored on the memory and executable on the processor. Among them, when the processor executes the computer program, the method described in any one of claims 1 to 5 is implemented.

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