CN110762268A - Method for designing internal dimension of regulating valve - Google Patents
Method for designing internal dimension of regulating valve Download PDFInfo
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- CN110762268A CN110762268A CN201810742455.9A CN201810742455A CN110762268A CN 110762268 A CN110762268 A CN 110762268A CN 201810742455 A CN201810742455 A CN 201810742455A CN 110762268 A CN110762268 A CN 110762268A
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
Abstract
The invention provides a method for designing the internal dimension of a regulating valve, which is based on an ANSYS platform, corrects the difference between a simulated flow coefficient and a theoretical flow coefficient through multiple iterative design, so that the simulated flow coefficient of the regulating valve is close to the theoretical flow coefficient, the design precision of the internal dimension of the regulating valve is improved, and the regulating performance of the regulating valve is further improved; and through a specific grid division method and solving setting, the simulation calculation error is reduced, the iteration time of each time is shortened, and the product research and development period is further shortened.
Description
Technical Field
The invention relates to the field of automatic instruments and meters, in particular to a method for designing the internal dimension of a regulating valve.
Background
The regulating valve plays a role in regulating parameters such as medium pressure, flow and the like in industrial application, particularly in a chemical process system, has regulating performance related to the quality and safety of chemical production, and is an important control element in the chemical process system. The adjusting performance of the adjusting valve depends on the error of each opening Cv value of the valve and the theoretical Cv value; and each opening Cv value can be realized by designing the flow area of the valve internals at each opening.
At present, the size of an internal part of an adjusting valve is usually designed by adopting an area comparison method, but in most cases, the effective flow area of the internal part is obviously deviated from the actual flow area, the area comparison method does not consider the fluid flow change of the internal part with different opening degrees, the error of a design reference model is transmitted to a newly designed product to generate an accumulated error, and the obtained result sometimes has a far difference from a real result and influences the adjusting performance of the adjusting valve. When finite element analysis software is used for auxiliary design, the problems of high grid quality requirement, long time consumption for grid division, complex calculation model, long time consumption for solution and the like exist, so that the design period is long, and the requirements of small-batch multi-variety production of valves cannot be met.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a method for designing an internal dimension of a regulating valve, which is used to solve the problems of large error between the internal dimension of the regulating valve and a theoretical value and long product cycle in the prior art, improve the design accuracy of the internal dimension, and shorten the product development cycle.
To achieve the above and other related objects, the present invention provides a method for designing an inner dimension of a regulator valve, comprising:
s1: providing a model of a regulating valve and a theoretical flow coefficient, selecting the regulating valve with the flow coefficient which is closest to the theoretical flow coefficient and is in the same model, defining the regulating valve in the same model as a reference model, and defining the flow coefficient which is closest to the theoretical flow coefficient as a reference flow coefficient;
s2: calculating a reference flow coefficient, a reference flow area and a theoretical flow coefficient through a direct proportional relation to obtain a design flow area, and establishing a structural model under the condition of an opening M according to the design flow area;
s3: leading the structural model into a Design Modeller module of an ANSYS platform, and establishing a fluid model;
s4: carrying out grid division on the fluid model, and calculating to obtain inlet and outlet pressures and volume flow of the fluid model;
s5: calculating to obtain a simulation flow coefficient according to the inlet pressure, the outlet pressure and the volume flow;
s6: judging whether the error between the simulated flow coefficient and the theoretical flow coefficient is within N%, if so, finishing the internal dimension design under the condition of the opening M; if not, returning to S2, calculating the design flow area through the direct proportional relation of the simulation flow coefficient, the simulation flow area and the theoretical flow coefficient, and establishing a structural model under the condition of the opening M according to the design flow area.
Optionally, the mesh partitioning includes: and carrying out mesh division on the fluid model by using ANSYS mesh, and finishing the mesh division and generating a mesh file by setting the size of the global mesh and refining the mesh at the throttling position.
Optionally, the grid file is imported into an ANSYS Fluent, the fluid medium is water, the turbulence model is RNS K-e, the solver is Pressure-based, the near wall surface adopts a near wall surface function method, the solving control parameters are kept default, and solving calculation is performed.
Optionally, the turbulence model is RNS K-e, and the boundary conditions employ a velocity inlet and a pressure outlet.
Optionally, solving and calculating convergence to obtain inlet and outlet pressures and volume flow.
Optionally, the conditions of solving, calculating and converging are that no backflow occurs in the fluid model, each residual curve region is stable, fluctuation of the inlet pressure range is stable, and the absolute value error of the volume flow is less than ± 0.005%.
Optionally, the analog flow coefficient calculation formula is:
wherein CvDieTo simulate the flow coefficient, P1Inlet pressure in kPa; p2Outlet pressure in kPa; q is the volume flow in m3/hr。
Optionally, the calculation formula for designing the flow area is as follows:
wherein Cv1For reference of the flow coefficient, S1For reference flow area, Cv2Is a theoretical flow coefficient, S2To design the flow area.
Optionally, N is less than or equal to 5.
Optionally, the method further includes S7, where S7 specifically is: changing the size of M in S2, repeating S2 to S6.
As described above, the method for designing the internal dimension of the regulating valve of the present invention has the following advantages:
1. through multiple iterative design, the simulated flow coefficient of the regulating valve is close to the theoretical flow coefficient, the design precision of the internal dimension of the regulating valve is improved, and the regulating performance of the regulating valve is further improved;
2. a fluid model is established through an Ansys platform, and the difference between the simulated flow coefficient and the theoretical flow coefficient is simulated and corrected for multiple times, so that the simulated flow coefficient approaches the theoretical flow coefficient, and the product research and development period is shortened.
Drawings
Fig. 1 is a schematic structural diagram of a regulator valve according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of a method for designing the internal dimensions of a regulator valve according to an embodiment of the present invention.
Fig. 3 is a schematic view of a structural model according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of fluid model grid division according to an embodiment of the present invention.
Description of reference numerals
1 valve core
2 guide ring
3 valve body
4 valve seat
5 valve foreline
6 valve rear pipeline
Edge of A valve core
B valve seat edge
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1 to 4. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Before describing embodiments of the present invention in detail, the present invention will be described in an application environment. The technology of the invention is mainly applied to the field of automatic instruments, the adjusting performance of the adjusting valve mainly depends on the internal dimension of the adjusting valve, specifically flow coefficient and flow area, the design value and the theoretical value of the internal dimension of the adjusting valve have larger error at present, the adjusting performance is reduced, the research and development period of the product is longer, and the invention provides a method for designing the internal dimension of the adjusting valve.
Referring to fig. 2, the formula ① and the formula ② in fig. 2 are respectively:andthis example takes a regulation valve with HTS DN50 Cv44 logarithmic characteristic and 30% opening as an example, and introduces a specific process of the method of the present invention:
(1) according to the existing two-dimensional drawing of logarithmic characteristics of HTS DN50 Cv50, a three-dimensional model is established by using three-dimensional software. Referring to fig. 1, a pipeline in front of a valve and behind the valve is established according to a Cv (flow coefficient) test standard, wherein the diameter of the pipeline in front of the valve is 2d, and the diameter of the pipeline behind the valve is 6d (d is a nominal diameter of the pipeline). Only the valve core 1, the guide ring 3, the valve body 3, the valve seat 4, the valve front pipeline 5 and the valve front pipeline 6 need to be established;
(2) utilizing a calculation formula of a design flow area:
(formula ①) where Cv1For reference of the flow coefficient, S1For reference flow area, Cv2Is a theoretical flow coefficient, S2To design the flow area, please refer to fig. 1, the flow area is the flow area at the minimum throttling position of the regulating valve under the current opening, the effective flow area of the opening is the circular ring surface area formed by the minimum distance AB between the valve seat and the valve core, the curved surface size of the valve core is preliminarily designed (the valve of the embodiment realizes the flow coefficient value design by designing the size of the valve core), and the regulating valve model is modified to 30% opening;
(3) converting the three-dimensional model in the step (2) into an intermediate format x _ t, and introducing the intermediate format x _ t into a design nModelr module of an ANSYS platform to complete the creation of a fluid domain model, wherein the valve is a symmetrical model and adopts a half model, as shown in FIG. 3;
(4) entering an ANSYS mesh grid division module, carrying out grid division on the fluid domain model created in the step (3), and finishing the grid division by setting the size of a global grid and refining a grid at a throttling position, wherein as shown in FIG. 4, grid nodes at the junction of a hexahedral grid and a tetrahedron are automatically aligned, the grid at the minimum throttling position is divided into six layers of grids, and the number of the grids is about 120 ten thousand;
(5) importing the grid files divided in the step (4) into Fluent, setting fluid media as water, a turbulence model RNS K-e, a speed inlet of 0.5m/s and a Pressure outlet of 0.1Mpa, setting Pressure-based default by a solver, setting a near-wall function method by the near-wall solver, keeping default for solving control parameters, solving and calculating, adopting the speed inlet and the Pressure outlet as boundary conditions, and solving and calculating convergence conditions that no backflow occurs in the fluid model, each residual error curve area is stable, the fluctuation of an inlet Pressure range is stable and the absolute value error of volume flow is less than +/-0.005%;
(6) when the calculation reaches the convergence condition, the inlet and outlet pressure and the volume flow are read and introduced
Where Cv is equal to (equation ②)DieTo simulate the flow coefficient, P1Inlet pressure in kPa; p2Outlet pressure in kPa; q is the volume flow in m3Hr, calculating the simulated flow coefficient CvDie；
(7) Simulating the flow coefficient CvDieAnd the theoretical flow coefficient CvTheory of thingsComparing, if the simulated flow coefficient and the theoretical flow coefficient are not within +/-5% of an allowable tolerance range, repeating the steps (2) to (7) until the requirements are met;
(8) if the flow coefficient Cv is simulatedDieAnd the theoretical flow coefficient CvTheory of thingsIf the tolerance is within the allowable tolerance range, establishing a next opening three-dimensional model, and repeating the steps (2) to (8); and when the size of the valve core corresponding to all the opening degrees is corrected, the size of the internal part of the regulating valve is designed.
The design results of the embodiment are compared:
(1) table 1 shows the simulated flow coefficient Cv for each opening degree designed by this methodDieAnd the theoretical flow coefficient CvTheory of thingsAs can be seen from the table, the flow coefficient Cv is simulated for each openingDieAnd the theoretical flow coefficient CvTheory of thingsThe error of (2) is within +/-5%, and the design requirement is met.
TABLE 1 simulation flow coefficient Cv for each openingDieAnd the theoretical flow coefficient CvTheory of things
| Opening degree | Simulation of Cv | Theoretical Cv | Error of the measurement |
| 10％ | 1.34 | 1.30 | 2.81％ |
| 20％ | 1.94 | 1.92 | 0.85％ |
| 30％ | 2.89 | 2.85 | 1.54％ |
| 40％ | 4.04 | 4.21 | -4％ |
| 50％ | 6.01 | 6.22 | -3.39％ |
| 60％ | 9.25 | 9.2 | 0.54％ |
| 70％ | 13.7 | 13.61 | 0.7％ |
| 80％ | 20.74 | 20.12 | 3.07％ |
| 90％ | 30.6 | 29.75 | 2.82％ |
| 100％ | 44.63 | 44 | 1.42％ |
(2) Table 2 shows that the effective flow areas of HTS DN50 Cv44 logarithmic characteristics of each opening are obtained by utilizing the logarithmic characteristics of HTS DN50 Cv50 logarithmic characteristics of each opening through an area ratio method and the method of the invention; the difference of the effective flow area of each opening obtained by the two methods is too large, and the error of the Cv value of each opening and the theoretical value is within +/-5 percent; therefore, when the size of the valve inner part is designed by adopting the area ratio method, larger errors sometimes occur, and the size of the valve inner part designed by the method can improve the adjustment precision of the adjusting valve.
TABLE 2 effective flow area for each opening
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A method of designing internal dimensions of a regulator valve, comprising:
s1: providing a model of a regulating valve and a theoretical flow coefficient, selecting the regulating valve with the flow coefficient which is closest to the theoretical flow coefficient and is in the same model, defining the regulating valve in the same model as a reference model, and defining the flow coefficient which is closest to the theoretical flow coefficient as a reference flow coefficient;
s2: calculating a reference flow coefficient, a reference flow area and a theoretical flow coefficient through a direct proportional relation to obtain a design flow area, and establishing a structural model under the condition of an opening M according to the design flow area;
s3: leading the structural model into a Design Modeller module of an ANSYS platform, and establishing a fluid model;
s4: carrying out grid division on the fluid model, and calculating to obtain inlet and outlet pressures and volume flow of the fluid model;
s5: calculating to obtain a simulation flow coefficient according to the inlet pressure, the outlet pressure and the volume flow;
s6: judging whether the error between the simulated flow coefficient and the theoretical flow coefficient is within N%, if so, finishing the internal dimension design under the condition of the opening M; if not, returning to S2, calculating the design flow area through the direct proportional relation of the simulation flow coefficient, the simulation flow area and the theoretical flow coefficient, and establishing a structural model under the condition of the opening M according to the design flow area.
2. The method of designing the internal dimension of a regulator valve according to claim 1, wherein: the mesh division includes: and carrying out mesh division on the fluid model by using ANSYS mesh, and finishing the mesh division and generating a mesh file by setting the size of the global mesh and refining the mesh at the throttling position.
3. The method of designing the internal dimension of a regulator valve according to claim 2, wherein: and importing the grid file into an ANSYS Fluent, setting a fluid medium as water, setting a turbulence model as RNS K-e, setting a solver as Pressure-based, solving control parameters to keep default, and performing solving calculation.
4. The method of designing the inner dimension of the regulator valve according to claim 3, wherein: the turbulence model is RNS K-e, and the boundary conditions employ a velocity inlet and a pressure outlet.
5. The method of designing the inner dimension of the regulator valve according to claim 3, wherein: solving and calculating convergence to obtain inlet and outlet pressures and volume flow.
6. The method of designing the inner dimension of the regulator valve according to claim 5, wherein: the conditions for solving, calculating and converging are that no backflow is generated in the fluid model, each residual curve area is stable, the fluctuation of the inlet pressure range is stable, and the absolute value error of the volume flow is less than +/-0.005%.
7. The method of designing the internal dimension of a regulator valve according to claim 1, wherein: the calculation formula of the simulated flow coefficient is as follows:
wherein CvDieTo simulate the flow coefficient, P1Inlet pressure in kPa; p2Outlet pressure in kPa; q is the volume flow in m3/hr。
8. The method of designing the internal dimension of a regulator valve according to claim 1, wherein: the calculation formula for the design flow area is:
wherein Cv1For reference of the flow coefficient, S1For reference flow area, Cv2Is a theoretical flow coefficient, S2To design the flow area.
9. The method of designing the internal dimension of a regulator valve according to claim 1, wherein: and N is less than or equal to 5.
10. The method of designing the internal dimension of a regulator valve according to claim 1, wherein: further comprising S7, wherein S7 specifically is: changing the size of M in S2, repeating S2 to S6.
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Cited By (5)
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| CN111795816A (en) * | 2020-07-14 | 2020-10-20 | 浙江大学 | Flow characteristic measuring device and method for control valve sleeve |
| CN113028071A (en) * | 2020-07-27 | 2021-06-25 | 浙江力诺流体控制科技股份有限公司 | Design method of pilot balance cage type regulating valve |
| CN113255185A (en) * | 2021-05-21 | 2021-08-13 | 重庆川仪调节阀有限公司 | Automatic simulation method for valve regulation characteristic |
| CN113779709A (en) * | 2021-07-21 | 2021-12-10 | 重庆川仪调节阀有限公司 | Regulating valve noise determination method |
| CN113987404A (en) * | 2021-10-27 | 2022-01-28 | 杭州丹纳计量科技有限公司 | Flow valve opening degree adjusting method and system based on parameter updating correction |
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