CN110781631A - V-shaped ball valve core optimization design method capable of achieving equal percentage characteristics - Google Patents
V-shaped ball valve core optimization design method capable of achieving equal percentage characteristics Download PDFInfo
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- CN110781631A CN110781631A CN201911199306.3A CN201911199306A CN110781631A CN 110781631 A CN110781631 A CN 110781631A CN 201911199306 A CN201911199306 A CN 201911199306A CN 110781631 A CN110781631 A CN 110781631A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0605—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
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Abstract
The invention discloses a V-shaped ball valve core optimization design method capable of realizing equal percentage characteristics, which comprises the steps of collecting data information of an original V-shaped ball valve core; calculating the actual flow of the valve core of the ball valve; calculating the equal percentage characteristic coefficient of the valve core of the ball valve; calculating the deviation between the equal percentage characteristic coefficients of the valve core of the ball valve by using a standard deviation method, and judging whether the deviation is acceptable by using a hypothesis test analysis method; if so, determining that the final optimized shape of the valve core of the V-shaped ball valve is obtained, otherwise, calculating the theoretical flow value of the original valve core of the V-shaped ball valve; optimizing the original V-shaped ball valve core based on the actual flow and the theoretical flow until the final optimized shape of the V-shaped ball valve core is obtained; by adopting the method, the optimal valve core shape of the V-shaped ball valve with equal percentage characteristics under small opening degree can be realized through fewer sample calculation and optimization processes, so that the valve core of the V-shaped ball valve meets the equal percentage characteristics under the condition of full opening degree.
Description
Technical Field
The invention relates to the field of ball valve design, in particular to a V-shaped ball valve core optimization design method capable of realizing equal percentage characteristics.
Background
From the valve invention to present, people always find a valve which integrates the advantages of good adjusting performance, simple structure, small fluid resistance, tight and reliable seal, convenient opening and closing and the like, and the V-shaped ball valve is one of the finding results. Although the existing V-shaped ball valves are close to the equal percentage flow characteristic in most cases, the equal percentage characteristic of the V-shaped ball valves can ensure that the equal percentage flow characteristic, namely the relative opening and the relative flow satisfy the formula only when the relative opening is large
On the contrary, the requirement is not guaranteed, wherein the relative opening degree is represented as L/L, namely the quotient of the stroke L of a certain opening degree and the stroke L of full opening; the relative flux is expressed as Q/Q
maxI.e. the flow rate Q at a certain opening and the flow rate Q at full opening
maxQuotient of R
QRepresenting the equal percentage characteristic coefficient. Therefore, the shape of the valve core is optimized to realize the equal percentage characteristic under the condition of smaller opening degree, and the valve core becomes a more and more pass which is most wanted and most difficult to break in the field of valve research at present.
In order to obtain a V-shaped ball valve with better equal percentage characteristics, research teams at home and abroad carry out a great deal of research on the V-shaped ball valve. In a large number of related researches, the flow characteristics of the valve core are tested in a numerical simulation or experiment mode, and the data of the valve core are comprehensively analyzed. Most design aspects ensure that the design under the condition of large opening degree meets the requirements, but the design under the condition of small opening degree is few, how to utilize an optimization design method to solve the shape of the valve core under the small opening degree is a difficult point in the design of the current V-shaped ball valve system, and the current domestic and foreign countries have no optimization design method for the valve core of the V-shaped ball valve, which can realize the percentage characteristics of small opening degree and the like, and reports are available.
Disclosure of Invention
The invention discloses an optimal design method of a valve core of a V-shaped ball valve, which can realize equal percentage characteristics, and comprises the following steps:
step 1: collecting data information of an original V-shaped ball valve core;
the data information of the original V-shaped ball valve core comprises the following data information: the inner diameter of the valve core, the original opening angle, the radius of the opening section with larger opening degree, the length of the opening section and the radius of the opening section with smaller opening degree;
step 2: calculating the actual flow according to the data information of the original V-shaped ball valve core;
step 2-1: according to the data information of the valve core of the V-shaped ball valve, establishing a physical model of the V-shaped ball valve by using ANSYS engineering design simulation software;
step 2-2: setting initial opening degree of a physical model based on a valve core of the V-shaped ball valve, and constructing a fluid calculation model of the valve core of the V-shaped ball valve by using a geometrical component Geometry tool in ANSYS engineering design simulation software;
step 2-3: dividing grids for a fluid calculation model of the valve core of the V-shaped ball valve by using a grid dividing Meshing tool in ANSYS;
step 2-4: based on the grid model obtained in the step 2-3, performing V-shaped ball valve flow numerical calculation analysis by using a fluid analysis Fluent tool in ANSYS engineering design simulation software to obtain an actual flow value of the V-shaped ball valve during initial opening;
step 2-5: determining a terminal opening between the initial opening and the maximum opening of the original V-shaped ball valve, dividing m equipartition opening points between the initial opening and the terminal opening, and performing optimized calculation and analysis on the relative opening of the valve core and the flow of the valve core by using a Response Surface tool optimized and analyzed in ANSYS engineering design simulation software to obtain an actual flow value of each equipartition opening point of the valve core of the V-shaped ball valve;
and step 3: calculating the equal percentage characteristic coefficient of the original V-shaped ball valve core based on the actual flow value of the original V-shaped ball valve core;
and 4, step 4: calculating the deviation between the equal percentage characteristic coefficients of the opening degrees of the valve core of the V-shaped ball valve by using a standard deviation method based on the equal percentage characteristic coefficients of the valve core of the original V-shaped ball valve, performing hypothesis test analysis, performing step 8 by using t test when | t | < t (m-1), and otherwise, performing step 5;
and 5: calculating a theoretical flow value of the original V-shaped ball valve core based on the equal percentage characteristic coefficient of the original V-shaped ball valve core;
step 6: comparing the actual flow value of the original V-shaped ball valve core with the theoretical flow value of the original V-shaped ball valve core, and adjusting the shape of the original V-shaped ball valve core to obtain the optimized shape of the original V-shaped ball valve core;
and 7: further optimizing the optimized shape of the valve core of the initial V-shaped ball valve by using the methods from the step 2 to the step 6;
and (4) repeatedly executing the step 2 to the step 6 based on the initial V-shaped ball valve core optimized shape, recalculating the equal percentage characteristic coefficient value, and readjusting the geometric shape of the ball valve core until the new equal percentage characteristic coefficient is approximately the same.
And 8: and obtaining the final optimized shape of the valve core of the V-shaped ball valve, and finishing.
According to the method for optimally designing the valve core of the V-shaped ball valve capable of realizing equal percentage characteristics, in the step 6, Q is utilized
2/Q
1＝A
2,i/A
1,iAdjusting the cross-sectional area corresponding to the i-th opening, wherein Q
1Is the actual flow value, Q, of the valve core of the V-shaped ball valve
2The theoretical flow value of the valve core of the V-shaped ball valve is obtained; definition A
1,iThe sectional area of the valve core of the valve corresponding to the relative opening degree before the shape of the valve core is adjusted, A
2,iThe shape of the valve core is adjusted to correspond to the sectional area of the valve core under the relative opening, and the sectional area of the valve core of the valve is α pi r by using the radian area A
1 2The/360 calculation, α, is the angle corresponding to the arc.
According to the optimal design method for the valve core of the V-shaped ball valve capable of realizing equal percentage characteristics, in the step 2-4, a kappa-epsilon turbulence model and inlet and outlet boundary conditions, namely inlet pressure 392280Pa and outlet pressure 389384Pa, are set under a Setup module of the Fluent software, and actual flow data is defined as outlet parameters of the Setup module and named as mass inlet.
According to the optimal design method for the valve core of the V-shaped ball valve capable of realizing equal percentage characteristics, in the step 2-5, the optimal analysis method defined in the Response Surface tool for optimal analysis of ANSYS engineering design simulation software is an experimental design DOE method, the inlet parameter is Rotate, and the outlet parameter is mass inlet; regarding the inlet parameter Rotate, taking the initial opening degree of 5 degrees as an initial point, taking the opening degree of 65 degrees as an end point, and equally dividing the opening degree interval of 5 degrees between 5 degrees and 65 degrees to obtain 13 opening degree points.
According to the method for optimally designing the valve core of the V-shaped ball valve capable of realizing equal percentage characteristics, in the step 4, the equal percentage characteristic coefficient values of 13 opening points in the table 1 are firstly set as a sampling sample x
1,x
2.....x
13Eliminating the non-advantages of the 13 sampling samples, then selecting other n-9 sample points to make the sample mean value
Then solving the standard deviation of m-13 samples
The standard deviation is used for judging the degree of the coefficient deviation of the valve core with equal percentage characteristics, and finally the mean value of the known sample is obtained
In the case of (1), hypothesis testing analysis is performed, using t test, when | t<And t (12), considering that the shape of the valve core of the V-shaped ball valve is optimal, otherwise, considering that the shape of the valve core of the V-shaped ball valve needs to be adjusted.
Has the advantages that: by adopting the method for optimally designing the valve core of the V-shaped ball valve capable of realizing equal percentage characteristics, the optimal valve core shape of the V-shaped ball valve with equal percentage characteristics under smaller opening degree can be realized through fewer sample calculation and optimization processes, so that the valve core of the V-shaped ball valve meets the equal percentage characteristics under the condition of full opening degree, the calculated amount is small, and the optimization process is quick and convenient.
Drawings
FIG. 1 is a flow chart of an optimal design method for a valve core of a V-shaped ball valve, which can realize equal percentage characteristics, according to the invention;
FIG. 2 is a diagram showing the actual shape of the original DN 50V-shaped valve core of the embodiment of the invention;
FIG. 3 is a design size diagram of the opening of the original DN 50V-shaped valve core of the embodiment of the invention;
FIG. 4 is a flow chart of a method for calculating the actual flow of the valve element of the V-shaped ball valve in step 2 of the invention;
FIG. 5 is a physical model diagram of a valve core of a V-shaped ball valve of type DN50V according to an embodiment of the invention;
FIG. 6 is a fluid calculation model diagram of a model V-shaped ball valve spool of type DN50V according to an embodiment of the invention;
FIG. 7 is a grid model diagram of a model for calculating fluid in a valve core of a V-shaped ball valve of type DN50V according to an embodiment of the invention;
FIG. 8 is a diagram of an optimized shape of a V-shaped valve core of type DN50 according to an embodiment of the invention;
FIG. 9 is a schematic view of an optimized opening design size of a V-shaped gate valve cartridge of type DN50 according to an embodiment of the invention;
FIG. 10 is a graph comparing equal percentage characteristics under different conditions of the present invention;
FIG. 11 is a schematic view of the design size of the opening of the valve core of the type DN 80V-shaped ball valve;
fig. 12 is a schematic diagram of the design size of the opening of the valve core of the DN 100V-shaped ball valve.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
The method for optimally designing the valve core of the V-shaped ball valve capable of realizing equal percentage characteristics, as shown in fig. 1, comprises the following steps:
step 1: collecting data information of an original V-shaped ball valve core;
the data information of the original V-shaped ball valve core comprises the following data information: the inner diameter of the valve core, the original opening angle, the radius of the opening section with larger opening degree, the length of the opening section and the radius of the opening section with smaller opening degree. The original V-shaped ball valve adopted in the present embodiment is of DN50 type, the shape of the valve core is shown in fig. 2, and the design size of the opening is shown in fig. 3 and includes: the diameter of the valve core is 50mm, the original opening angle is 45 degrees, the radius R of the opening section with larger opening degree is 24mm, the length L of the opening section is 42mm, and the radius R of the opening section with smaller opening degree is R
1＝2mm。
Step 2: calculating the actual flow of the original V-shaped ball valve core according to the data information of the original V-shaped ball valve core;
the important point of the design research of the valve core of the V-shaped ball valve is to consider the flow characteristic of the valve core, wherein the flow characteristic represents the flow passing through the valve core of the V-shaped ball valve under different opening degrees.
The method for calculating the actual flow of the valve element of the V-shaped ball valve, as shown in fig. 4, includes the following steps:
step 2-1: according to the data information of the valve core of the V-shaped ball valve, establishing a physical model of the V-shaped ball valve by using ANSYS engineering design simulation software;
in this embodiment, a physical model of the DN50V V-shaped ball valve core is created by using a Geometry tool in ANSYS engineering design simulation software according to the initial information of the DN50V V-shaped ball valve core collected in step 1, as shown in fig. 5.
Step 2-2: setting initial opening degree of a physical model based on a valve core of the V-shaped ball valve, and constructing a fluid calculation model of the valve core of the V-shaped ball valve by using a geometrical component Geometry tool in ANSYS engineering design simulation software;
in the embodiment, the initial opening degree of the valve core of the DN50V V-shaped ball valve is 5 °, and the relative opening degree value is 92.9% calculated by a relative opening degree formula L/L, wherein L is the valve opening degree, L is the maximum valve opening degree, and the maximum opening degree of the DN50V V-shaped ball valve in the embodiment is 70 °. In the present embodiment, the opening degree parameter is named Rotate. In the embodiment, based on the initial opening degree of 5 degrees, a fluid calculation model of a DN50V type V-shaped ball valve core is constructed by utilizing a Geometry tool in ANSYS engineering design simulation software, and is shown in FIG. 6;
step 2-3: dividing grids for a fluid calculation model of the valve core of the V-shaped ball valve by using a grid dividing Meshing tool in ANSYS;
in this embodiment, a mesh division tool in ANSYS is used to perform mesh division on a fluid calculation model of a DN50V type V-shaped ball valve core, and the obtained mesh model is shown in fig. 7.
Step 2-4: based on the grid model obtained in the step 2-3, performing V-shaped ball valve flow numerical calculation analysis by using a fluid analysis Fluent tool in ANSYS engineering design simulation software to obtain an actual flow value of the V-shaped ball valve during initial opening;
in the embodiment, a kappa-epsilon turbulence model and inlet and outlet boundary conditions, namely inlet pressure 392280Pa and outlet pressure 389384Pa, are set under a Setup module of Fluent software, the actual flow value of a DN50V type V-shaped ball valve is 1.5Kg/s when the relative opening degree is 92.9% obtained through calculation, and the actual flow data is defined as an outlet parameter of the Setup module and named as masssinlet.
Step 2-5: determining a terminal opening between the initial opening and the maximum opening of the original V-shaped ball valve, dividing a plurality of opening points required by calculation analysis between the initial opening and the terminal opening, and performing optimized calculation analysis on the relative opening of the valve core and the flow of the valve core by using a Response Surface tool optimized and analyzed in ANSYS engineering design simulation software to obtain an actual flow value of each opening point of the valve core of the V-shaped ball valve;
in this embodiment, the optimization analysis method defined in the Response Surface tool for optimization analysis of ANSYS engineering design simulation software is an experimental design DOE method, where the import parameter is Rotate and the export parameter is mass inlet. Regarding an import parameter Rotate, taking an initial opening degree of 5 degrees as an initial point, taking an opening degree of 65 degrees as a terminal point, equally dividing an opening degree interval of every 5 degrees between 5 degrees and 65 degrees to obtain 13 opening degree points, converting the opening degree points by using a relative opening degree formula L/L to convert the opening degree points into relative opening degrees, wherein the relative opening degree values of the 13 opening degree points are shown in a first column of a table 1, and obtaining the actual flow values of the valve spools of all 13 opening degree points through automatic calculation of a Response Surface tool optimized and analyzed in ANSYS engineering design simulation softwareAnd is defined as Q
1As shown in the second column of table 1.
Table 1 original DN50 model V-shape ball valve core analysis and calculation result data table
And step 3: calculating the equal percentage characteristic coefficient of the original V-shaped ball valve core based on the actual flow value of the original V-shaped ball valve core;
using relative opening L/L and relative flux Q/Q
maxThe corresponding equal percentage characteristic coefficient R can be calculated
Q1Wherein Q is the actual flow value of the V-shaped ball valve core at a certain opening degree, Q
maxThe actual flow value of the valve core of the V-shaped ball valve under the full-open condition is a variable value. In the embodiment, the equal percentage characteristic coefficient R corresponding to 13 opening points in the opening interval selected for the DN50V V-shaped ball valve core
Q1As shown in the last column of Table 1, this value reflects the magnitude of the valve spool adjustment capability, and a basic characteristic of a valve with equal percentage of good performance is R
Q1The sizes are similar. As can be seen from Table 1, the equal percentage characteristic coefficient R in the interval from 92.9% to 50% of the larger relative opening degree
Q1Relatively uniform, and the equal percentage characteristic coefficient R of the small opening degree range from 21.4% to 7.1%
Q1The increase is very fast, therefore the geometry of this interval needs to be adjusted in order to be able to satisfy R
Q1The design requirements of similar size.
And 4, step 4: calculating the deviation between the equal percentage characteristic coefficients of the opening degrees of the valve core of the V-shaped ball valve by using a standard deviation method based on the equal percentage characteristic coefficients of the valve core of the original V-shaped ball valve, performing hypothesis test analysis, performing step 8 by using t test when | t | < t (m-1), and otherwise, performing step 5;
in the present embodiment, first, the equal percentage characteristic coefficient values of the 13 opening points in table 1 are set as the sample x
1,x
2.....x
13And the equal percentage characteristic coefficient value is R by taking the point with the relative opening degree of 92.9 percent as a reference
Q113 samples are rejected at 14.91Greater than 2R in the sample
Q1After four points of 32.19, 42.47, 62.41 and 119.9, other n-9 sample points are selected and used as a sample mean value
Solving for m-13 sample R
Q1Standard deviation of (2)
The standard deviation is used for judging the degree of the coefficient deviation of the valve core equal percentage characteristics of the valve, and the mean value of the known sample is obtained
In the case of (1), hypothesis testing analysis is performed, using t test, when | t<t (m-1) | t-<And t (12), considering that the shape of the valve core of the V-shaped ball valve is optimal, and executing the step 8, otherwise, considering that the shape of the valve core of the V-shaped ball valve needs to be adjusted.
And 5: calculating a theoretical flow value of the original V-shaped ball valve core based on the equal percentage characteristic coefficient of the original V-shaped ball valve core;
in this embodiment, the sample mean of the equal percentage characteristic coefficients is continuously used
Using mathematical expressions of equal percentage flow
Sample-based mean value for calculating 13 opening points
And is denoted as Q
2As shown in the fourth column of table 1;
step 6: comparing the actual flow value of the original V-shaped ball valve core with the theoretical flow value of the original V-shaped ball valve core, and adjusting the shape of the original V-shaped ball valve core to obtain the optimized shape of the original V-shaped ball valve core;
based on sample mean
Calculating theoretical flow Q
2Is mainly aimed at regulating valve core structure of valve by utilizing Q
2/Q
1＝A
2,i/A
1,iAdjusting the cross-sectional area corresponding to the i-th opening, wherein A is defined
1,iThe sectional area of the valve core of the valve corresponding to the relative opening degree before the shape of the valve core is adjusted, A
2,iThe shape of the valve core is adjusted to correspond to the sectional area of the valve core of the valve under the relative opening. Theoretical flow rate Q
2And the actual flow rate Q
1The ratio of (A) to (B) is the sectional area ratio under the condition of corresponding opening degree, wherein the sectional area of the valve core is α pi r by using radian area A
1 2The/360 calculation, α, is the angle corresponding to the arc.
And 7: further optimizing the optimized shape of the valve core of the initial V-shaped ball valve by using the methods from the step 2 to the step 6;
based on the initial V-shaped ball valve core optimized shape, the step 2 to the step 6 are repeatedly executed, and the equal percentage characteristic coefficient R is recalculated
QiAdjusting the valve core geometry of the ball valve again until the percentage characteristic coefficient R is equal
QiAre substantially identical.
And 8: and obtaining the final optimized shape of the valve core of the V-shaped ball valve, and finishing.
In the present embodiment, the final optimized shape of the V-shaped gate valve core of DN50 type is obtained as shown in fig. 8, and the opening design size is shown in fig. 9, wherein the radius of the opening section with larger opening degree is 24mm, the length of the opening section is 30mm, and the radius of the opening section with smaller opening degree is R
1’＝7mm。
From table 2, it can be found that the actual flow Q of the fully open condition after iteration is due to the change of the shape of the spool
maxThe change was made such that the equal percentage coefficient of performance decreased to 12.4 when the opening was 92.9% degrees and to 47.6 when the opening was 7.1% degrees. The relative opening is in the range of 28.6% to 7.1%, and the equal percentage characteristic coefficient is improved compared with the prototype. As can be seen by comparing the equal percentage characteristic coefficient values in tables 1 and 2, the equal percentage characteristic coefficient R of the valve core of the optimized V-shaped ball valve
QiMore balanced values, at relative openingThe control is more stable in a smaller range.
Table 2 data table of analysis and calculation results of optimized DN 50V-type ball valve core
In this embodiment, the optimized DN50V V-shaped ball valve core is tested and verified by using a V-shaped ball valve core flow testing experimental device, and the flow characteristics of the V-shaped ball valve core at different opening degrees are measured, so as to obtain the experimental results shown in table 3.
Table 3 optimized DN50V model V ball valve core flow characteristic experiment data table
By comparing the analysis and calculation data of the original DN50V V-type ball valve model and the final DN50V V-type ball valve optimization model given in table 1, table 2 and table 3 and the data obtained by experimental verification of the final DN50V V-type ball valve optimization model, it can be found that the geometric percentage characteristic coefficient R of the optimization model obtained by the experimental verification shown in fig. 10 is equal to the geometric percentage characteristic coefficient R of the optimization model
QsThe ratio is obtained by numerical analysis and calculation
QiThe data of the values are more uniform, thus showing that the method of the invention is reasonable and effective.
By utilizing the method, the invention also carries out valve core shape optimization design aiming at DN80 type and DN100 type, the opening design sizes of the optimized DN80 type and DN100 type V-shaped ball valve cores are respectively shown in fig. 11 and fig. 12, and the tables 4 and 5 are respectively the calculation data of the original models and the final optimization models of DN80 type and DN100 type.
Table 4 analysis and calculation data table of original and optimized DN80V V-shaped ball valve
Table 5 table of analytical calculation data for original and optimized type DN100V V-shaped ball valve
According to the DN50 type V-shaped ball valve core optimization design process and the DN80 type and DN100 type calculation data in the embodiment, the invention provides a reasonable, quick and effective V-shaped ball valve core design method, and the method can ensure that the V-shaped ball valve core can meet the equal percentage characteristic requirement under the condition of smaller opening degree, so that the flow regulation capacity of the valve core is stronger, and the valve design of designers is easier.
Claims (5)
1. A valve core optimization design method of a V-shaped ball valve capable of realizing equal percentage characteristics is characterized by comprising the following steps: the method comprises the following steps:
step 1: collecting data information of an original V-shaped ball valve core;
the data information of the original V-shaped ball valve core comprises the following data information: the inner diameter of the valve core, the original opening angle, the radius of the opening section with larger opening degree, the length of the opening section and the radius of the opening section with smaller opening degree;
step 2: calculating the actual flow according to the data information of the original V-shaped ball valve core;
step 2-1: according to the data information of the valve core of the V-shaped ball valve, establishing a physical model of the V-shaped ball valve by using ANSYS engineering design simulation software;
step 2-2: setting initial opening degree of a physical model based on a valve core of the V-shaped ball valve, and constructing a fluid calculation model of the valve core of the V-shaped ball valve by using a geometrical component Geometry tool in ANSYS engineering design simulation software;
step 2-3: dividing grids for a fluid calculation model of the valve core of the V-shaped ball valve by using a grid dividing Meshing tool in ANSYS;
step 2-4: based on the grid model obtained in the step 2-3, performing V-shaped ball valve flow numerical calculation analysis by using a fluid analysis Fluent tool in ANSYS engineering design simulation software to obtain an actual flow value of the V-shaped ball valve during initial opening;
step 2-5: determining a terminal opening between the initial opening and the maximum opening of the original V-shaped ball valve, dividing m equipartition opening points between the initial opening and the terminal opening, and performing optimized calculation and analysis on the relative opening of the valve core and the flow of the valve core by using a Response Surface tool optimized and analyzed in ANSYS engineering design simulation software to obtain an actual flow value of each equipartition opening point of the valve core of the V-shaped ball valve;
and step 3: calculating the equal percentage characteristic coefficient of the original V-shaped ball valve core based on the actual flow value of the original V-shaped ball valve core;
and 4, step 4: calculating the deviation between the equal percentage characteristic coefficients of the opening degrees of the valve core of the V-shaped ball valve by using a standard deviation method based on the equal percentage characteristic coefficients of the valve core of the original V-shaped ball valve, performing hypothesis test analysis, performing step 8 by using t test when | t | < t (m-1), and otherwise, performing step 5;
and 5: calculating a theoretical flow value of the original V-shaped ball valve core based on the equal percentage characteristic coefficient of the original V-shaped ball valve core;
step 6: comparing the actual flow value of the original V-shaped ball valve core with the theoretical flow value of the original V-shaped ball valve core, and adjusting the shape of the original V-shaped ball valve core to obtain the optimized shape of the original V-shaped ball valve core;
and 7: further optimizing the optimized shape of the valve core of the initial V-shaped ball valve by using the methods from the step 2 to the step 6;
and (4) repeatedly executing the step 2 to the step 6 based on the initial V-shaped ball valve core optimized shape, recalculating the equal percentage characteristic coefficient value, and readjusting the geometric shape of the ball valve core until the new equal percentage characteristic coefficient is approximately the same.
And 8: and obtaining the final optimized shape of the valve core of the V-shaped ball valve, and finishing.
2. The optimal design method for the valve core of the V-shaped ball valve capable of realizing equal percentage characteristics according to claim 1, is characterized in that: in said step 6, Q is used
2/Q
1＝A
2,i/A
1,iAdjusting the cross-sectional area corresponding to the i-th opening, wherein Q
1Is the actual flow value, Q, of the valve core of the V-shaped ball valve
2The theoretical flow value of the valve core of the V-shaped ball valve is obtained; definition A
1,iThe sectional area of the valve core of the valve corresponding to the relative opening degree before the shape of the valve core is adjusted, A
2,iThe shape of the valve core is adjusted to correspond to the sectional area of the valve core under the relative opening, and the sectional area of the valve core of the valve is α pi r by using the radian area A
1 2The/360 calculation, α, is the angle corresponding to the arc.
3. The optimal design method for the valve core of the V-shaped ball valve capable of realizing equal percentage characteristics according to claim 2, is characterized in that: in the step 2-4, a kappa-epsilon turbulence model and inlet and outlet boundary conditions, namely inlet pressure 392280Pa and outlet pressure 389384Pa, are set under a Setup module of the Fluent software, and actual flow data is defined as outlet parameters of the Setup module and named as mass inlet.
4. The optimal design method for the valve core of the V-shaped ball valve capable of realizing equal percentage characteristics according to claim 3, is characterized in that: in the step 2-5, the optimization analysis method defined in the optimization analysis Response Surface tool of ANSYS engineering design simulation software is an experimental design DOE method, the import parameter is Rotate, and the export parameter is mass inlet; regarding the inlet parameter Rotate, taking the initial opening degree of 5 degrees as an initial point, taking the opening degree of 65 degrees as an end point, and equally dividing the opening degree interval of 5 degrees between 5 degrees and 65 degrees to obtain 13 opening degree points.
5. The optimal design method for the valve core of the V-shaped ball valve capable of realizing equal percentage characteristics according to claim 4, is characterized in that: in the step 4, the equal percentage characteristic coefficient values of the 13 opening points in table 1 are firstly set as the sampling sample x
1,x
2.....x
13Removing the non-advantages of 13 sampling samples, then selecting other n-9 sample points to make the sample mean value
Then solving the standard deviation of m-13 samples
The standard deviation is used for judging the degree of the coefficient deviation of the valve core with equal percentage characteristics, and finally the mean value of the known sample is obtained
In the case of (1), hypothesis testing analysis is performed, using t test, when | t<And t (12), considering that the shape of the valve core of the V-shaped ball valve is optimal, otherwise, considering that the shape of the valve core of the V-shaped ball valve needs to be adjusted.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115859535A (en) * | 2023-03-01 | 2023-03-28 | 西安泵阀总厂有限公司 | Design method and device of U-shaped adjusting ball valve |
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| CN108591494A (en) * | 2018-04-10 | 2018-09-28 | 中国北方发动机研究所(天津) | A kind of multi-section mixing regulation valve core design method |
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| CN108591494A (en) * | 2018-04-10 | 2018-09-28 | 中国北方发动机研究所(天津) | A kind of multi-section mixing regulation valve core design method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115859535A (en) * | 2023-03-01 | 2023-03-28 | 西安泵阀总厂有限公司 | Design method and device of U-shaped adjusting ball valve |
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