Volute molded line design method and system, electronic equipment, medium and program product

Abstract

The invention provides a volute molded line design method and system, electronic equipment, a medium and a program product. The volute molded line design method comprises the steps that the first spiral angle and the second spiral angle of a volute are determined; in response to the fact that the target spiral angle of the volute is larger than or equal to 0 and smaller than the first spiral angle, a first radius corresponding to the target spiral angle is determined based on a first spiral linear equation; in response to the fact that the target spiral angle of the volute is larger than or equal to the first spiral angle and smaller than or equal to the second spiral angle, a second radius corresponding to the target spiral angle is determined based on a second spiral linear equation; and in response to the fact that the target spiral angle of the volute is larger than the second spiral angle and smaller than or equal to # imgabs0 #, a third radius corresponding to the target spiral angle is determined based on a third spiral linear equation. The efficiency of the fan system is effectively improved, and the noise of the fan system is reduced to a certain extent.

Description

Technical Field

[0001] The present disclosure relates to the technical field of range hoods, and in particular to a volute profile design method, system, electronic equipment, medium, and program product. Background Art

[0002] The volute of a multi-blade centrifugal fan is a critical component of the fan system. Its function is to guide the gas leaving the impeller to the volute outlet and convert some of its kinetic energy into pressure energy. Since the gas leaving the impeller first impacts the volute wall, the volute profile directly affects the flow losses within the volute.

[0003] Currently, the main methods for designing volute profiles include the equal annular volume method, the Archimedean spiral equation method, the average velocity method, the structural square method, the unequal distance square method, and so on. The above methods are more based on speed. Under the above methods, the flow rate of the fluid through different sections of the volute is proportional to the angle formed between the section and the starting section of the volute. This design method ensures that the angular momentum remains unchanged, so that the tangential velocity of the fluid naturally decreases as the radius increases when flowing in the volute, avoiding flow separation caused by sudden changes in velocity and thus reducing energy loss. However, the above design methods are less applicable when designing small fan systems. This is mainly because small fans have a higher speed when they are increased to the same air volume as larger fans, and any uneven pressure is likely to cause loud noise. At the same time, small fans usually use local cutting solutions to make up for the lack of air volume, but this also makes it easier to increase noise. Summary of the Invention

[0004] The technical problem to be solved by the present disclosure is to overcome the defect in the prior art that the volute profile design causes high fan noise, and to provide a volute profile design method, system, electronic equipment, medium and program product.

[0005] The present disclosure solves the above technical problems through the following technical solutions:

[0006] The present disclosure provides a volute profile design method, the volute profile design method comprising:

[0007] Determine a first helical angle and a second helical angle of the volute; wherein the first helical angle is used to characterize the minimum helical angle of the straight segment of the volute; and the second helical angle is used to characterize the maximum helical angle of the straight segment of the volute;

[0008] In response to a target helical angle of the volute being greater than or equal to 0 and less than the first helical angle, determining a first radius corresponding to the target helical angle based on a first helical linear equation;

[0009] In response to a target helical angle of the volute being greater than or equal to the first helical angle and less than or equal to the second helical angle, determining a second radius corresponding to the target helical angle based on a second helical linear equation;

[0010] In response to the target helical angle of the volute being greater than the second helical angle and less than or equal to , then determine the third radius corresponding to the target spiral angle based on the third spiral linear equation.

[0011] Preferably, the volute profile design method includes:

[0012] Based on the same static pressure value, the first spiral linear equation is determined by the Bernoulli equation and the air flow rate of the volute cross-sectional area;

[0013] and / or,

[0014] Based on the same static pressure value, determining the second spiral linear equation by using the first spiral angle, the second spiral angle, the radius corresponding to the first spiral angle, and the radius corresponding to the second spiral angle;

[0015] and / or,

[0016] Based on the same static pressure value, the third spiral linear equation is determined by deducing the Bernoulli equation and the curvature compensation angle.

[0017] Preferably, the step of determining the first spiral linear equation based on the same static pressure value by using the Bernoulli equation and the air flow rate of the volute cross-sectional area includes:

[0018] The air flow rate of the volute cross-sectional area is determined by the following formula:

[0019] ;

[0020] Among them, Q is used to represent the total flow rate of the volute cross-sectional area, Used to characterize the local flow rate of the volute cross-sectional area, It is used to characterize the target spiral angle corresponding to the cross-sectional area of ​​the volute, and d is used to characterize the volute diameter corresponding to the target spiral angle;

[0021] The air flow through the volute cross-sectional area determines the radial velocity component and the tangential velocity component:

[0022] ;

[0023] ;

[0024] in, Used to characterize the radial velocity component, It is used to characterize the tangential velocity component, r is used to characterize the radius, b is used to characterize the volute thickness, Q is used to characterize the total flow of the volute cross-sectional area, and C is used to characterize the annular constant value;

[0025] Determine the Bernoulli equation with static pressure as the first constant and air density as the second constant:

[0026] ;

[0027] Among them, p is used to represent the static pressure value; Used to represent air density; v is used to represent the total velocity;

[0028] Substituting the radial velocity component and the tangential velocity component into the Bernoulli equation, the following first formula is obtained:

[0029] ;

[0030] Among them, r is used to represent the radius, b is used to represent the volute thickness, Q is used to represent the total flow rate of the volute cross-sectional area, and C is used to represent the annular constant value;

[0031] The equation of the first helix is ​​determined according to the formula:

[0032] ;

[0033] in, Used to characterize the first radius, It is used to characterize the starting radius of the volute, and k is used to characterize the fifth constant. Used to characterize the target helical angle.

[0034] Preferably, the step of determining the second spiral linear equation based on the same static pressure value by using the first spiral angle, the second spiral angle, the radius corresponding to the first spiral angle, and the radius corresponding to the second spiral angle comprises:

[0035] The slope of the volute straight line segment is determined by the second formula:

[0036] ;

[0037] Among them, A is used to represent the slope of the volute straight line segment, Used to characterize the first helix angle, Used to characterize the second helix angle, Used to characterize the radius corresponding to the first helical angle, Used to characterize the radius corresponding to the second helix angle;

[0038] The intercept is determined by the third formula:

[0039] ;

[0040] Among them, B is used to represent the intercept of the volute straight line segment, It is used to represent the first helical angle, and A is used to represent the slope of the volute straight line segment. Used to characterize the radius corresponding to the first helical angle;

[0041] The second spiral linear equation is determined by the second formula and the third formula:

[0042] ;

[0043] in, Used to represent the second radius; A is used to represent the slope of the volute straight line segment; B is used to represent the intercept of the volute straight line segment; Used to characterize the target helical angle.

[0044] Preferably, the step of determining the third spiral linear equation based on the same static pressure value by deriving the Bernoulli equation and the curvature compensation angle includes:

[0045] The curvature compensation angle is determined according to the fourth formula:

[0046] ;

[0047] in, It is used to characterize the curvature compensation angle, and k is used to characterize the fifth constant. Used to characterize the first helix angle, Used to characterize the second helix angle, Used to characterize the radius corresponding to the second helix angle, Used to characterize the starting radius of the volute;

[0048] A third spiral linear equation is determined based on the first spiral linear equation and the curvature compensation angle:

[0049] ;

[0050] in, Used to characterize the third radius, It is used to characterize the starting radius of the volute, and k is used to characterize the fifth constant. Used to characterize the target spiral angle, Used to characterize the curvature compensation angle.

[0051] Preferably, the volute profile design method further includes:

[0052] The length of the volute is set to be less than or equal to 350 mm;

[0053] and / or,

[0054] The spiral expansion angle of the volute is set to be less than 12 degrees;

[0055] and / or,

[0056] The initial helix angle and the radius of the volute are designed jointly, and the initial helix angle is set to be greater than 10 degrees and less than 30 degrees.

[0057] The present disclosure further provides a volute profile design system, the volute profile design system comprising:

[0058] a determination module, configured to determine a first helical angle and a second helical angle of the volute; wherein the first helical angle is used to characterize the minimum helical angle of a straight segment of the volute; and the second helical angle is used to characterize the maximum helical angle of a straight segment of the volute;

[0059] a first equation module for determining a first radius corresponding to the target helical angle based on a first helical linear equation in response to a target helical angle of the volute being greater than or equal to 0 and less than the first helical angle;

[0060] a second equation module for determining a second radius corresponding to the target helical angle based on a second helical linear equation in response to a target helical angle of the volute being greater than or equal to the first helical angle and less than or equal to the second helical angle;

[0061] The third equation module is used to respond to the target spiral angle of the volute being greater than the second spiral angle and less than or equal to , then determine the third radius corresponding to the target spiral angle based on the third spiral linear equation.

[0062] The present disclosure also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and configured to run on the processor, wherein the processor implements the above-mentioned volute profile design method when executing the computer program.

[0063] The present disclosure also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the above-mentioned volute profile design method is implemented.

[0064] The present disclosure also provides a computer program product, including a computer program, which implements the above-mentioned volute profile design method when executed by a processor.

[0065] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

[0066] The positive progress of this disclosure is:

[0067] The present disclosure determines the volute radius corresponding to different volute spiral angles through a piecewise spiral linear equation, thereby reducing the problem of uneven volute pressure distribution caused by local cutting, thereby effectively improving the efficiency of the fan system and reducing the noise of the fan system to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 This is a flow chart of a volute profile design method provided in Example 1 of the present disclosure;

[0069] Figure 2 A structural diagram of a volute profile design system provided in Example 2 of the present disclosure;

[0070] Figure 3 This is a structural diagram of an electronic device provided in Example 3 of the present disclosure. DETAILED DESCRIPTION

[0071] The present disclosure is further illustrated below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0072] In the embodiments of the present disclosure, prefixes such as "first" and "second" are used only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. In the embodiments of the present disclosure, the use of prefixes such as ordinal numbers to distinguish description objects does not constitute a limitation on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and no unnecessary limitations should be constituted due to the use of such prefixes. In addition, in the description of this embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0073] Example 1

[0074] This embodiment provides a method for designing the volute profile. Figure 1 , the volute profile design methods include:

[0075] S1. Determine a first helical angle and a second helical angle of the volute.

[0076] The first helical angle is used to represent the minimum helical angle of the volute straight segment, and the second helical angle is used to represent the maximum helical angle of the volute straight segment.

[0077] S2. In response to the target helical angle of the volute being greater than or equal to 0 and less than the first helical angle, determining a first radius corresponding to the target helical angle based on the first helical linear equation.

[0078] S3. In response to the target helical angle of the volute being greater than or equal to the first helical angle and less than or equal to the second helical angle, determining a second radius corresponding to the target helical angle based on a second helical linear equation.

[0079] S4, in response to the target spiral angle of the volute being greater than the second spiral angle and less than or equal to , then the third radius corresponding to the target spiral angle is determined based on the third spiral linear equation.

[0080] This embodiment uses a piecewise spiral linear equation to determine the volute radius corresponding to different volute spiral angles, thereby reducing the problem of uneven volute pressure distribution caused by local cutting, thereby effectively improving the efficiency of the fan system and reducing the noise of the fan system to a certain extent.

[0081] In an optional embodiment, the volute profile design method includes:

[0082] Based on the same static pressure value, the first spiral linear equation is determined by the Bernoulli equation and the air flow rate of the volute cross-sectional area.

[0083] For example, the air flow rate of the volute cross-sectional area is determined by the following formula:

[0084] .

[0085] Among them, Q is used to represent the total flow rate of the volute cross-sectional area, Used to characterize the local flow rate of the volute cross-sectional area, It is used to characterize the target spiral angle corresponding to the volute cross-sectional area, and d is used to characterize the volute diameter corresponding to the target spiral angle.

[0086] The air flow through the volute cross-sectional area determines the radial velocity component and the tangential velocity component:

[0087] .

[0088] .

[0089] in, Used to characterize the radial velocity component, It is used to characterize the tangential velocity component, r is used to characterize the radius, b is used to characterize the volute thickness, Q is used to characterize the total flow rate of the volute cross-sectional area, and C is used to characterize the annular constant value.

[0090] Determine the Bernoulli equation with static pressure as the first constant and air density as the second constant:

[0091] .

[0092] Among them, p is used to represent the static pressure value. It is used to represent the air density. v is used to represent the total velocity.

[0093] Substituting the radial velocity component and the tangential velocity component into the Bernoulli equation, we get the following first formula:

[0094] .

[0095] Among them, r is used to represent the radius, b is used to represent the volute thickness, Q is used to represent the total flow rate of the volute cross-sectional area, and C is used to represent the circulation constant value.

[0096] Determine the equation of the first spiral according to the formula:

[0097] .

[0098] in, Used to characterize the first radius, It is used to characterize the starting radius of the volute, and k is used to characterize the fifth constant. Used to characterize the target helical angle.

[0099] In this embodiment, a first spiral linear equation is given based on pressure balance, and then a first radius is obtained, so that the static pressure of the airflow is evenly distributed when it flows circumferentially along the volute, effectively reducing the pressure pulsation and impact load of the fluid, thereby making the fan system where the volute is located more stable and reducing the mechanical vibration and noise of the fan system.

[0100] In an optional embodiment, the volute profile design method includes:

[0101] Based on the same static pressure value, a second spiral linear equation is determined by the first spiral angle, the second spiral angle, the radius corresponding to the first spiral angle, and the radius corresponding to the second spiral angle.

[0102] For example, the slope of the volute straight line segment is determined by the second formula:

[0103] .

[0104] Among them, A is used to represent the slope of the volute straight line segment, Used to characterize the first helix angle, Used to characterize the second helix angle, Used to characterize the radius corresponding to the first helical angle, Used to characterize the radius corresponding to the second helix angle.

[0105] The intercept is determined by the third formula:

[0106] .

[0107] Among them, B is used to represent the intercept of the volute straight line segment, It is used to represent the first helical angle, and A is used to represent the slope of the volute straight line segment. Used to characterize the radius corresponding to the first helix angle.

[0108] The second spiral linear equation is determined by the second and third formulas:

[0109] .

[0110] in, Used to represent the second radius. A is used to represent the slope of the volute straight line segment. B is used to represent the intercept of the volute straight line segment. Used to characterize the target helical angle.

[0111] In this embodiment, the radius of the straight line cut out of the straight segment of the volute at the starting position and the ending position of the cutting is equal to that of the spiral line, and the curvature of the straight line cut out at the starting position and the ending position of the cutting is equal to that of the spiral line, so as to ensure that the spiral line and the straight line are a continuous line. Therefore, when the target spiral angle falls within the range of the first spiral angle and the second spiral angle, the second spiral linear equation is determined by the slope-intercept linear equation, and then the second radius can be obtained by the second spiral linear equation, thereby improving the calculation efficiency of the radius of the straight line segment.

[0112] In an optional embodiment, the volute profile design method includes:

[0113] Based on the same static pressure value, the third spiral linear equation is determined by deducing the Bernoulli equation and the curvature compensation angle.

[0114] For example, the curvature compensation angle is determined according to the fourth formula:

[0115] .

[0116] in, It is used to characterize the curvature compensation angle, and k is used to characterize the fifth constant. Used to characterize the first helix angle, Used to characterize the second helix angle, Used to characterize the radius corresponding to the second helix angle, Used to characterize the starting radius of the volute.

[0117] The third spiral linear equation is determined based on the first spiral linear equation and the curvature compensation angle:

[0118] .

[0119] in, Used to characterize the third radius, It is used to characterize the starting radius of the volute, and k is used to characterize the fifth constant. Used to characterize the target spiral angle, Used to characterize the curvature compensation angle.

[0120] In this embodiment, based on the combination of the first spiral linear equation and the curvature compensation angle, the circulation loss caused by the straight line segment can be corrected, thereby improving the accuracy of the design of the third radius profile of the volute.

[0121] In an optional embodiment, this volute profile design is particularly applicable to small-sized fan systems with a volute length of 350 mm or less. To meet the required airflow volume, small-sized fan systems often require cutting and reshaping a section of the volute to ensure that the length dimension meets the required size. However, due to the sudden change in the cross-sectional area of ​​the volute flow path after cutting, the original volute profile equation needs to be adjusted to ensure uniform airflow and isobaric distribution within the volute flow path.

[0122] In an optional embodiment, in order to avoid flow separation, the spiral expansion angle of the volute may be set to an angle less than 12 degrees.

[0123] In an optional embodiment, the initial helix angle of the volute and the radius of the volute tongue are designed jointly, and the initial helix angle is generally set to an angle greater than 10 degrees and less than 30 degrees.

[0124] The following example illustrates the volute profile design method of this embodiment in detail. The design goal of this example is pressure balance, effectively promoting the conversion of kinetic energy into pressure energy, reducing energy loss, and improving fan system efficiency. Furthermore, pressure balance effectively reduces fluid pressure pulsation and impact loads, resulting in more stable fan system operation and reduced mechanical vibration and noise.

[0125] Because the volute profile design method is to expect the static pressure of the airflow to be evenly distributed along the circumference of the volute, it is necessary to keep the static pressure value of each section of the volute constant. At the same time, the airflow no longer gains energy after entering the volute. When the effect of wall friction on the airflow is ignored, the momentum of the airflow remains unchanged, that is, the circumferential velocity of the airflow on any section of the volute is The product of its radius r remains unchanged, that is, *r = the sixth constant.

[0126] Because the airflow is uniform along the entire circumference of the impeller, the volute is at a certain angle. Cross-sectional area at Satisfy the formula , where Q is used to characterize the total flow rate of the volute cross-sectional area, Used to characterize the local flow rate of the volute cross-sectional area, It is used to characterize the target spiral angle corresponding to the cross-sectional area of ​​the volute, and d is used to characterize the volute diameter corresponding to the target spiral angle. According to the Bernoulli equation: , where p is used to represent the static pressure value. Used to characterize air density. v is used to characterize the total velocity, which can be decomposed into radial velocity components. and the tangential velocity component ,in, , , Used to characterize the radial velocity component, is used to characterize the tangential velocity component, r is used to characterize the radius, b is used to characterize the volute thickness, Q is used to characterize the total flow of the volute cross-sectional area, and C is used to characterize the circulation constant value. Then, assuming that p is the first constant, we can get: ,Will , Substitute them into the formula to get Solving the above equations yields the first spiral equation: ,in, Used to characterize the first radius, It is used to characterize the starting radius of the volute, and k is used to characterize the fifth constant. Used to characterize the target helical angle. , where k is usually in the range of 0.02~0.05. In addition, it should be noted that the spiral expansion angle α of the volute is less than 12° to avoid flow separation, and the initial angle Need to be designed in conjunction with the radius of the snail tongue, the initial angle Generally, it is 10°~30°.

[0127] Assume that the straight line segment of the volute is located in the angle interval ∈[ , ], then according to the cutting conditions, the position requirements that need to meet the boundary conditions are: ,in, For characterization The starting spiral angle of the curve on the left is For characterization The starting spiral angle of the curve on the right is For characterization The starting spiral angle of the curve on the left is For characterization The starting spiral angle of the curve on the right is For characterization The radius of the curve on the left, For characterization The right curve radius, For characterization The radius of the curve on the left, For characterization The radius of the curve on the right side of the cutting line is equal to the radius of the spiral line cut at the starting and ending positions of the cutting. The curvature continuity requirement that needs to meet the boundary conditions is: , ,in, For characterization The curvature on the left side, For characterization The curvature on the right side of For characterization The curvature on the left side, For characterization That is, the curvature of the straight line and the spiral line cut at the starting and ending positions are equal. This ensures that the spiral line and the straight line are a continuous line.

[0128] Therefore, the traditional spiral equation can be optimized into a three-segment spiral equation:

[0129] ;

[0130] Among them, the slope of the straight line segment , the intercept is , the curvature compensation angle is , used to correct the annular loss caused by the straight line segment. Among them, A is used to characterize the slope of the volute straight line segment, and B is used to characterize the intercept of the volute straight line segment. Used to characterize the target spiral angle, Used to characterize the first helix angle, Used to characterize the radius corresponding to the first helix angle. It is used to characterize the curvature compensation angle, and k is used to characterize the fifth constant. Used to characterize the second helix angle, Used to characterize the radius corresponding to the second helix angle, Used to characterize the starting radius of the volute.

[0131] Example 2

[0132] Corresponding to the aforementioned embodiment of the volute profile design method, the present disclosure also provides an embodiment of a volute profile design system.

[0133] See also Figure 2 , the volute profile design system includes:

[0134] Determination module 1 is used to determine a first helical angle and a second helical angle of the volute. The first helical angle is used to represent the minimum helical angle of the volute straight segment. The second helical angle is used to represent the maximum helical angle of the volute straight segment.

[0135] The first equation module 2 is configured to determine a first radius corresponding to the target spiral angle based on a first spiral linear equation in response to a target spiral angle of the volute being greater than or equal to 0 and less than a first spiral angle.

[0136] The second equation module 3 is configured to determine a second radius corresponding to the target spiral angle based on a second spiral linear equation in response to the target spiral angle of the volute being greater than or equal to the first spiral angle and less than or equal to the second spiral angle.

[0137] The third equation module 4 is used to respond to the target spiral angle of the volute being greater than the second spiral angle and less than or equal to , then the third radius corresponding to the target spiral angle is determined based on the third spiral linear equation.

[0138] In an optional embodiment, the first equation module 2 is further configured to determine the first spiral linear equation based on the same static pressure value by using the Bernoulli equation and the air flow rate of the volute cross-sectional area.

[0139] In an optional embodiment, the second equation module 3 is further configured to determine a second spiral linear equation based on the same static pressure value by using the first spiral angle, the second spiral angle, the radius corresponding to the first spiral angle, and the radius corresponding to the second spiral angle.

[0140] In an optional embodiment, the third equation module 4 is further configured to determine a third spiral linear equation based on the same static pressure value by deriving the Bernoulli equation and the curvature compensation angle.

[0141] In an optional embodiment, the first equation module 2 is further configured to determine the air flow rate of the volute cross-sectional area using the following formula:

[0142] ;

[0143] Among them, Q is used to represent the total flow rate of the volute cross-sectional area, Used to characterize the local flow rate of the volute cross-sectional area, It is used to characterize the target spiral angle corresponding to the cross-sectional area of ​​the volute, and d is used to characterize the volute diameter corresponding to the target spiral angle;

[0144] The air flow through the volute cross-sectional area determines the radial velocity component and the tangential velocity component:

[0145] ;

[0146] ;

[0147] in, Used to characterize the radial velocity component, It is used to characterize the tangential velocity component, r is used to characterize the radius, b is used to characterize the volute thickness, Q is used to characterize the total flow of the volute cross-sectional area, and C is used to characterize the annular constant value;

[0148] Determine the Bernoulli equation with static pressure as the first constant and air density as the second constant:

[0149] ;

[0150] Among them, p is used to represent the static pressure value; Used to represent air density; v is used to represent the total velocity;

[0151] Substituting the radial velocity component and the tangential velocity component into the Bernoulli equation, we get the following first formula:

[0152] ;

[0153] Among them, r is used to represent the radius, b is used to represent the volute thickness, Q is used to represent the total flow rate of the volute cross-sectional area, and C is used to represent the annular constant value;

[0154] Determine the equation of the first spiral according to the formula:

[0155] ;

[0156] in, Used to characterize the first radius, It is used to characterize the starting radius of the volute, and k is used to characterize the fifth constant. Used to characterize the target helical angle.

[0157] In an optional embodiment, the second equation module 3 is further configured to determine the slope of the volute straight line segment using a second formula:

[0158] ;

[0159] Among them, A is used to represent the slope of the volute straight line segment, Used to characterize the first helix angle, Used to characterize the second helix angle, Used to characterize the radius corresponding to the first helical angle, Used to characterize the radius corresponding to the second helix angle;

[0160] The intercept is determined by the third formula:

[0161] ;

[0162] Among them, B is used to represent the intercept of the volute straight line segment, It is used to represent the first helical angle, and A is used to represent the slope of the volute straight line segment. Used to characterize the radius corresponding to the first helical angle;

[0163] The second spiral linear equation is determined by the second and third formulas:

[0164] ;

[0165] in, Used to represent the second radius; A is used to represent the slope of the volute straight line segment; B is used to represent the intercept of the volute straight line segment; Used to characterize the target helical angle.

[0166] In an optional embodiment, the third equation module 4 is further configured to determine the curvature compensation angle according to a fourth formula:

[0167] ;

[0168] in, It is used to characterize the curvature compensation angle, and k is used to characterize the fifth constant. Used to characterize the first helix angle, Used to characterize the second helix angle, Used to characterize the radius corresponding to the second helix angle, Used to characterize the starting radius of the volute;

[0169] The third spiral linear equation is determined based on the first spiral linear equation and the curvature compensation angle:

[0170] ;

[0171] in, Used to characterize the third radius, It is used to characterize the starting radius of the volute, and k is used to characterize the fifth constant. Used to characterize the target spiral angle, Used to characterize the curvature compensation angle.

[0172] In an alternative embodiment, see Figure 2 , the volute profile design system also includes:

[0173] The size setting module 5 is used to set the length of the volute to be less than or equal to 350 mm.

[0174] In an optional embodiment, the size setting module 5 is further configured to set the spiral expansion angle of the volute to be less than 12 degrees.

[0175] In an optional embodiment, the size setting module 5 is also used for the joint design of the initial spiral angle and the radius of the spiral tongue of the volute, and the initial spiral angle is set to be greater than 10 degrees and less than 30 degrees.

[0176] Since the system embodiments generally correspond to the method embodiments, reference will be made to the description of the method embodiments for relevant details. The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components of the units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the disclosed solution.

[0177] Example 3

[0178] Figure 3 This is a structural diagram of an electronic device shown in an example embodiment of the present disclosure. The electronic device includes a memory, a processor, and a computer program stored in the memory and used to run on the processor. When the processor executes the computer program, the volute profile design method of any of the above embodiments is implemented. Figure 3 The electronic device 30 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0179] like Figure 3 As shown, the electronic device 30 may be a general-purpose computing device, such as a server device. Components of the electronic device 30 may include, but are not limited to, the at least one processor 31, the at least one memory 32, and a bus 33 connecting different system components (including the memory 32 and the processor 31).

[0180] The bus 33 includes a data bus, an address bus, and a control bus.

[0181] The memory 32 may include a volatile memory, such as a random access memory (RAM) 321 and / or a cache memory 322 , and may further include a read-only memory (ROM) 323 .

[0182] The memory 32 may also include a program tool 325 (or utility) having a set (at least one) of program modules 324, such program modules 324 including but not limited to: an operating system, one or more application programs, other program modules and program data, each of which or some combination may include an implementation of a network environment.

[0183] The processor 31 executes various functional applications and data processing by running the computer program stored in the memory 32, such as the volute profile design method provided in any of the above embodiments.

[0184] The electronic device 30 can also communicate with one or more external devices 34 (e.g., a keyboard, pointing device, etc.). This communication can be performed via an input / output (I / O) interface 35. Furthermore, the electronic device 30 can also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 36. As shown, the network adapter 36 communicates with other modules of the electronic device 30 via a bus 33. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device 30, including but not limited to microcode, device drivers, redundant processors, external disk drive arrays, RAID (RAID) systems, tape drives, and data backup storage systems.

[0185] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0186] Example 4

[0187] The embodiments of the present disclosure further provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the volute profile design method provided in any of the above embodiments.

[0188] Specifically, the readable storage medium may include but is not limited to: a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0189] Example 5

[0190] The embodiments of the present disclosure further provide a computer program product, including a computer program, which implements any of the above-mentioned volute profile design methods when executed by a processor.

[0191] The program code for executing the computer program product of the present disclosure may be written in any combination of one or more programming languages, and the program code may be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on the remote device.

[0192] While specific embodiments of the present disclosure have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present disclosure is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, and such changes and modifications are intended to fall within the scope of protection of the present disclosure.

Claims

1. A method for designing a volute profile, characterized in that: The volute profile design method includes: Determine a first helical angle and a second helical angle of the volute; wherein the first helical angle is used to characterize the minimum helical angle of the straight segment of the volute; and the second helical angle is used to characterize the maximum helical angle of the straight segment of the volute; In response to a target helical angle of the volute being greater than or equal to 0 and less than the first helical angle, determining a first radius corresponding to the target helical angle based on a first helical linear equation; In response to a target helical angle of the volute being greater than or equal to the first helical angle and less than or equal to the second helical angle, determining a second radius corresponding to the target helical angle based on a second helical linear equation; In response to the target helical angle of the volute being greater than the second helical angle and less than or equal to , then determine the third radius corresponding to the target spiral angle based on the third spiral linear equation.

2. The method for designing a volute profile according to claim 1, wherein: The volute profile design method includes: Based on the same static pressure value, the first spiral linear equation is determined by the Bernoulli equation and the air flow rate of the volute cross-sectional area; and / or, Based on the same static pressure value, determining the second spiral linear equation by using the first spiral angle, the second spiral angle, the radius corresponding to the first spiral angle, and the radius corresponding to the second spiral angle; and / or, Based on the same static pressure value, the third spiral linear equation is determined by deducing the Bernoulli equation and the curvature compensation angle.

3. The method for designing a volute profile according to claim 2, wherein: The step of determining the first spiral linear equation based on the same static pressure value by using the Bernoulli equation and the air flow rate of the volute cross-sectional area includes: The air flow rate of the volute cross-sectional area is determined by the following formula: ； Among them, Q is used to represent the total flow rate of the volute cross-sectional area, Used to characterize the local flow rate of the volute cross-sectional area, It is used to characterize the target spiral angle corresponding to the cross-sectional area of ​​the volute, and d is used to characterize the volute diameter corresponding to the target spiral angle; The air flow through the volute cross-sectional area determines the radial velocity component and the tangential velocity component: ； ； in, Used to characterize the radial velocity component, It is used to characterize the tangential velocity component, r is used to characterize the radius, b is used to characterize the volute thickness, Q is used to characterize the total flow of the volute cross-sectional area, and C is used to characterize the annular constant value; Determine the Bernoulli equation with static pressure as the first constant and air density as the second constant: ； Among them, p is used to represent the static pressure value; Used to represent air density; v is used to represent the total velocity; Substituting the radial velocity component and the tangential velocity component into the Bernoulli equation, the following first formula is obtained: ； Among them, r is used to represent the radius, b is used to represent the volute thickness, Q is used to represent the total flow rate of the volute cross-sectional area, and C is used to represent the annular constant value; The equation of the first helix is ​​determined according to the formula: ； in, Used to characterize the first radius, It is used to characterize the starting radius of the volute, and k is used to characterize the fifth constant. Used to characterize the target helical angle.

4. The method for designing a volute profile according to claim 2, wherein: The step of determining the second spiral linear equation based on the same static pressure value by using the first spiral angle, the second spiral angle, the radius corresponding to the first spiral angle, and the radius corresponding to the second spiral angle includes: The slope of the volute straight line segment is determined by the second formula: ； Among them, A is used to represent the slope of the volute straight line segment, Used to characterize the first helix angle, Used to characterize the second helix angle, Used to characterize the radius corresponding to the first helical angle, Used to characterize the radius corresponding to the second helix angle; The intercept is determined by the third formula: ； Among them, B is used to represent the intercept of the volute straight line segment, It is used to represent the first helical angle, and A is used to represent the slope of the volute straight line segment. Used to characterize the radius corresponding to the first helical angle; The second spiral linear equation is determined by the second formula and the third formula: ； in, Used to represent the second radius; A is used to represent the slope of the volute straight line segment; B is used to represent the intercept of the volute straight line segment; Used to characterize the target helical angle.

5. The method for designing a volute profile according to claim 3, wherein: The step of determining the third spiral linear equation based on the same static pressure value by deriving the Bernoulli equation and the curvature compensation angle includes: The curvature compensation angle is determined according to the fourth formula: ； in, It is used to characterize the curvature compensation angle, and k is used to characterize the fifth constant. Used to characterize the first helix angle, Used to characterize the second helix angle, Used to characterize the radius corresponding to the second helix angle, Used to characterize the starting radius of the volute; A third spiral linear equation is determined based on the first spiral linear equation and the curvature compensation angle: ； in, Used to characterize the third radius, It is used to characterize the starting radius of the volute, and k is used to characterize the fifth constant. Used to characterize the target spiral angle, Used to characterize the curvature compensation angle.

6. The method for designing a volute profile according to claim 1, wherein: The volute profile design method further includes: The length of the volute is set to be less than or equal to 350 mm; and / or, The spiral expansion angle of the volute is set to be less than 12 degrees; and / or, The initial helix angle and the radius of the volute are designed jointly, and the initial helix angle is set to be greater than 10 degrees and less than 30 degrees.

7. A volute profile design system, characterized in that: The volute profile design system includes: a determination module, configured to determine a first helical angle and a second helical angle of the volute; wherein the first helical angle is used to characterize the minimum helical angle of a straight segment of the volute; and the second helical angle is used to characterize the maximum helical angle of a straight segment of the volute; a first equation module for determining a first radius corresponding to the target helical angle based on a first helical linear equation in response to a target helical angle of the volute being greater than or equal to 0 and less than the first helical angle; a second equation module for determining a second radius corresponding to the target helical angle based on a second helical linear equation in response to a target helical angle of the volute being greater than or equal to the first helical angle and less than or equal to the second helical angle; The third equation module is used to respond to the target spiral angle of the volute being greater than the second spiral angle and less than or equal to , then determine the third radius corresponding to the target spiral angle based on the third spiral linear equation.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and configured to run on the processor, wherein: When the processor executes the computer program, the volute profile design method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the volute profile design method according to any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the volute profile design method according to any one of claims 1 to 6 is implemented.

Images