CN112597683B - Optimization method for sleeve throttling window of main water supply regulating valve - Google Patents

Optimization method for sleeve throttling window of main water supply regulating valve Download PDF

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CN112597683B
CN112597683B CN202011550805.5A CN202011550805A CN112597683B CN 112597683 B CN112597683 B CN 112597683B CN 202011550805 A CN202011550805 A CN 202011550805A CN 112597683 B CN112597683 B CN 112597683B
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valve
sleeve
water supply
delta
main water
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CN112597683A (en
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钱锦远
岳阳
吴嘉懿
刘平
李军业
吴辉
金志江
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Zhejiang University ZJU
CNNC Sufa Technology Industry Co Ltd
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CNNC Sufa Technology Industry Co Ltd
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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
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Abstract

The invention discloses an optimization method for a sleeve throttling window of a main water supply regulating valve, which comprises the following steps: constructing a three-dimensional structure original model of the target main water supply regulating valve; respectively assigning serial numbers to n throttling windows on one side of a longitudinal section of the valve in a three-dimensional structure original model; according to the parity of n, for twiOptimizing; gradually increasing | delta | by three-dimensional modeling software, and gradually increasing wc＝wcminWhile | δ | is recorded as | δmax(ii) a Respectively establishing three-dimensional structure models of the main water supply regulating valve under different delta correspondences and at the position where the valve core is regulated to the maximum opening; obtaining unbalanced moment M generated by the valve cores under different deltas under the impact of fluid through the computational fluid dynamics software; minimizing the unbalance moment MminThe corresponding delta is used as the optimized unbalanced arrangement degree delta of the throttling windowo，δoThe corresponding sleeve structure is an optimized sleeve structure. The method is based on the numerical simulation technology, avoids repeated theoretical formula calculation and experimental check processes, and saves the consumption of manpower and material resources.

Description

Optimization method for sleeve throttling window of main water supply regulating valve
Technical Field
The invention relates to a method for optimizing a throttling window of a valve sleeve, in particular to a method for optimizing a throttling window of a main water supply regulating valve sleeve, which is used for overcoming unbalanced moment of a valve core.
Background
The main feed water regulating valve is an important component of a water level control system of a pressurized water reactor type nuclear power plant, and is used for regulating the flow of feed water flowing into a steam generator so as to maintain the water level in the steam generator at a proper height. The height of the water level in the steam generator determines to a large extent the safety and economy of the nuclear power plant. The heat-carrying working medium from the reactor in the first loop continuously inputs heat into the steam generator, and the medium water with the flow controlled by the main water supply regulating valve in the second loop absorbs the heat in the steam generator to evaporate, and finally the steam turbine and the generator are pushed to realize power generation. From the perspective of safety, the appropriate water level of the steam generator can ensure that the reactor has enough cold energy and can prevent the blades of the steam turbine from being damaged due to overlarge load. From an economic point of view, a suitable steam generator level ensures sufficient steam production to ensure that the power generation of the nuclear power plant reaches the target demand. Therefore, the steam generator level is maintained at a proper value by means of the water level control system, which is one of the important prerequisites for the normal operation of the nuclear power plant. Although many factors affect the water level in the steam generator (e.g., the primary heat carrier medium flow/temperature, the secondary main feed water flow, the secondary steam flow, etc.), the water level control system controls the water level by adjusting the secondary main feed water flow, i.e., by controlling the opening of the main feed water adjusting valve.
The main water supply regulating valve used in the current nuclear power station basically consists of a straight-through valve body and a throttling window type sleeve. When large-flow fluid flows through the main water supply regulating valve, uneven pressure distribution can be formed at the bottom of the valve core, and unbalanced moment acts on the valve core. The unbalanced moment can lead the valve core to have the tendency of overturning, increases the friction force between the valve core and the sleeve, damages the sealing surface between the valve core and the sleeve on one hand, and hinders the movement of the valve core on the other hand, thereby influencing the control precision of the main water supply regulating valve.
Disclosure of Invention
The invention aims to provide an optimization method for a sleeve throttling window of a main water supply regulating valve, which can obviously reduce unbalanced moment borne by a valve core on the premise of keeping the flow capacity of the main water supply regulating valve basically unchanged, thereby improving the control precision of the main water supply regulating valve, and prolonging the service life of the main water supply regulating valve by reducing the damage of a sealing surface between the valve core and the sleeve.
The invention adopts the following specific technical scheme:
the invention provides an optimization method for a sleeve throttling window of a main water supply regulating valve, which comprises the following steps:
s1: constructing a three-dimensional structure original model of the target main water supply regulating valve through three-dimensional modeling software according to the design file of the target main water supply regulating valve; establishing a global rectangular coordinate system OXYZ by taking the central point of the bottom surface of the sleeve in the three-dimensional structure original model as an origin O; in the global rectangular coordinate system, a YOZ plane is superposed with a longitudinal section of the valve, a Z axis is superposed with an axis of the sleeve and points to the top of the sleeve in the positive direction, and a Y axis points to an outlet of the valve in the positive direction;
2n through throttling windows are formed in the sleeve of the target main water supply regulating valve along the circumferential direction, n is a natural number and is not less than 2; all the throttling windows are symmetrical about the longitudinal section of the valve, and the intervals between the adjacent throttling windows are the same; the axial section of the throttling window is sequentially a first rectangle, a trapezoid and a second rectangle from top to bottom; the top side of the trapezoid is overlapped with the bottom side of the first rectangle, the bottom side of the trapezoid is overlapped with the top side of the second rectangle, and the length of the top side is larger than that of the bottom side;
s2: in the three-dimensional structure original model, sequence numbers i of 1 and 2 … … n are respectively assigned to n throttling windows on one side of a longitudinal section of the valve from positive direction to negative direction along the Y axis; defining the length of the top side of the section of the ith throttling window as twiThe length of the bottom side of the section of the ith throttling window is bwiAnd twi>bwi(ii) a The minimum interval of two adjacent throttling windows in the circumferential direction of the sleeve is wc；twi、bwiAnd wcAre all positive numbers;
s3: selecting the following operation pairs tw alternatively according to the parity of niOptimizing;
when n is an even number, let
Figure BDA0002857665870000021
When n is an odd number, let
Figure BDA0002857665870000022
Wherein, twi' is the optimized length of the top side of the section of the throttling window; twavgIs the average value of the side length of the top part of the section of the throttling window, and meets the requirement
Figure BDA0002857665870000031
Delta is the unbalanced arrangement degree of the throttling window, and meets the condition that delta is less than or equal to 1;
s4: gradually increasing | delta | by three-dimensional modeling software, and gradually increasing wc＝wcminWhile | δ | is recorded as | δmax(ii) a Wherein, wcminIs the minimum interval design value of the adjacent throttling windows; making delta ═ delta-maxJ is a positive integer;
s5: in [ - |. delta-max，|δ|max]Within a regionSampling different deltas, optimizing the top side length of the section of the throttling window according to S3, and optimizing the optimized top side length tw of the section of the throttling window through three-dimensional modeling softwareiRespectively establishing three-dimensional structure models of the main water supply regulating valve under different delta correspondences and with the valve core regulated to the maximum opening, wherein the sampling points of delta are respectively- | delta tintmax……-2Δδ、-Δδ、0、Δδ、2Δδ……|δ|max；
S6: obtaining a runner model corresponding to each three-dimensional structure model in S5 through three-dimensional modeling software, dispersing each runner model through grid division software to obtain a grid model, and introducing the grid model into computational fluid dynamics software; in the computational fluid dynamics software, boundary condition parameters are set according to the design file of S1, and the same fluid properties as those in the design file of S1 are given to the whole space occupied by the mesh model;
s7: establishing a local rectangular coordinate system O ' X ' Y ' Z ' by taking a centroid point of the valve core in the three-dimensional structure model as a local origin O '; in the local rectangular coordinate system, a Y 'O' Z 'plane is superposed with a longitudinal section of the valve, a Z' axis is superposed with the axis of the sleeve and the positive direction of the Z 'axis points to the top of the sleeve, and the positive direction of the Y' axis points to the outlet of the valve; obtaining unbalanced moment M generated by the valve cores under different deltas under the impact of fluid through the computational fluid dynamics software; the unbalanced moment M takes a local original point O 'as a rotation center and takes an X' axis as a rotation axis;
s8: the minimum value M of the unbalance moment in S7 is calculatedminThe corresponding delta is used as the optimized unbalanced arrangement degree delta of the throttling windowo，δoThe corresponding sleeve structure is an optimized sleeve structure.
Preferably, in S1, the three-dimensional modeling software is one of Solidworks, Creo, Inventor, UG/NX, CATIA, ANSYS Workbench design model, and ANSYS Workbench SpaceClaim.
Preferably, in S1, the design file includes information on the composition and the operating condition of the target main water supply regulating valve.
Further, the composition information includes structure, size, and material properties of the target feedwater regulating valve.
Further, the information of the use condition comprises the physical property of the fluid introduced into the target main water supply regulating valve, the boundary condition at the outlet of the valve and the boundary condition at the inlet of the valve.
Preferably, in S1, the longitudinal cross section of the valve is a plane defined by a line connecting a center point of the inlet face and a center point of the outlet face of the valve and the axis of the sleeve.
Preferably, in S1, the sleeve is a hollow columnar member, is attached to the inside of the main water supply control valve, and is sandwiched between the main water supply control valve body and the valve cover.
Preferably, in S6, the Mesh division software is one of an ICEM CFD, HyperMesh, TGrid, PointWise, ANSA, GridPro, and ANSYS Workbench Mesh.
Preferably, in S6, the computational fluid dynamics software is one of ANSYS Fluent, ANSYS CFX, STAR-CD, STAR-CCM, NUMECA, OpenFOAM.
Preferably, in S6, the flow path model is a three-dimensional geometric space formed by a region through which the fluid flows in the valve.
Compared with the prior art, the invention has the following beneficial effects:
(1) the optimization method can obviously reduce the unbalanced moment borne by the valve core on the premise of keeping the flow capacity of the main water supply regulating valve basically unchanged, thereby improving the control precision of the main water supply regulating valve, and prolonging the service life of the main water supply regulating valve by reducing the damage of the sealing surface between the valve core and the sleeve.
(2) The optimization method is based on a numerical simulation technology, avoids repeated theoretical formula calculation and experimental check processes, and saves manpower and material resource consumption.
Drawings
FIG. 1 is a three-dimensional structure original model of a target main feedwater regulating valve in embodiment 1;
FIG. 2 is an original front view of the objective sleeve of example 1;
FIG. 3 is an original top cross-sectional view of the subject sleeve of example 1;
FIG. 4 is an original developed view of the objective sleeve of example 1;
FIG. 5 is a schematic view showing the relationship between the unbalance moment M and the unbalance arrangement degree δ in embodiment 1;
FIG. 6 is the flow coefficient C of the main feed water regulating valve in example 1vA relationship diagram with the unbalanced arrangement degree delta;
FIG. 7 is a front view of the sleeve optimized in embodiment 1;
FIG. 8 is a top cross-sectional view of the optimized sleeve of example 1;
FIG. 9 is a developed view of the sleeve optimized in example 1;
the reference numbers in the figures are: 1 is the valve rod, 2 is the valve gap, 3 is the gasket, 4 is the case, 5 is the sleeve, 6 is the valve body.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and the detailed description. The technical features of the embodiments of the present invention can be combined correspondingly without mutual conflict.
The invention provides an optimization method for a sleeve throttling window of a main water supply regulating valve, which comprises the following steps:
s1: and constructing a three-dimensional structure original model of the target main water supply regulating valve through three-dimensional modeling software according to the design file of the target main water supply regulating valve. The design file needs to include composition information and use condition information of the target main water supply regulating valve, wherein the composition information includes the structure, the size and the material attributes of the target main water supply regulating valve, and the use condition information includes the physical properties of fluid introduced into the target main water supply regulating valve, boundary conditions at a valve outlet and boundary conditions at a valve inlet. In this embodiment, the three-dimensional modeling software may be one of Solidworks, Creo, Inventor, UG/NX, CATIA, ANSYS Workbench design model, and ANSYS Workbench SpaceClaim.
And establishing a global rectangular coordinate system OXYZ by taking the central point of the bottom surface of the sleeve 5 in the obtained three-dimensional structure original model as an origin O. In the global rectangular coordinate system, the YOZ plane coincides with the longitudinal section of the valve, the Z axis coincides with the axis of the sleeve and the positive direction of the Z axis points to the direction of the top of the sleeve, and the positive direction of the Y axis points to the direction of the outlet of the valve. The longitudinal section of the valve refers to the plane defined by the connecting line of the central point of the inlet surface and the central point of the outlet surface of the valve and the axis of the sleeve 5, namely the mirror symmetry plane of the valve.
The optimization method of the invention is an optimization method aiming at a throttling window under a specific structure, and specifically comprises the following steps:
the sleeve 5 of the valve is a hollow columnar part, is arranged inside the main water supply regulating valve and is clamped between the valve body 6 of the main water supply regulating valve and the valve cover 2. The wall surface of the sleeve 5 is provided with a plurality of throttling windows along the circumferential direction, and the throttling windows are through holes which penetrate through the outer wall surface and the inner wall surface of the sleeve 5. 2n through throttling windows are arranged on the sleeve 5 of the target main water supply regulating valve along the circumferential direction, n is a natural number and is more than or equal to 2. All the throttling windows are symmetrical about the longitudinal section of the valve, and the intervals between the adjacent throttling windows are the same. The axial section of the throttling window is of a three-section structure from top to bottom, and sequentially comprises a first rectangle, a trapezoid and a second rectangle, wherein the top side of the trapezoid is overlapped with the bottom side of the first rectangle and has the same side length, the bottom side of the trapezoid is overlapped with the top side of the second rectangle and has the same side length, and the top side of the trapezoid is longer than the bottom side length. In the practical application process of the valve, fluid flows into the main water supply regulating valve from the inlet of the valve, flows out of the sleeve from the interior of the sleeve through the throttling window or flows into the sleeve from the exterior of the sleeve through the throttling window, and finally flows out of the main water supply regulating valve from the outlet of the valve.
S2: in the three-dimensional structure original model obtained in S1, the n throttle windows on one side of the longitudinal section of the valve are assigned with the serial numbers i of 1 and 2 … … n respectively from positive to negative along the Y axis, that is, the throttle window closest to the positive direction of the Y axis is assigned with the serial number i of 1, and the throttle window closest to the negative direction of the Y axis is assigned with the serial number i of n. Since all the throttling windows are symmetrical about the longitudinal section of the valve, in the optimization method, the shapes of all the throttling windows in the whole valve can be obtained only by considering the shapes of n throttling windows on one side of the longitudinal section of the valve.
Defining the length of the top side of the section of the ith throttling window as twiThe length of the bottom side of the section of the ith throttling window is bwiAnd twi>bwi. The minimum interval of two adjacent throttling windows in the circumferential direction of the sleeve is wc。twi、bwiAnd wcAre all positive numbers.
S3: selecting the following operation pairs tw alternatively according to the parity of niAnd (6) optimizing.
When n is an even number, let
Figure BDA0002857665870000061
When n is an odd number, let
Figure BDA0002857665870000062
Wherein, twi' is the optimized top side length of the throttling window section. twavgIs the average value of the side length of the top part of the section of the throttling window, and meets the requirement
Figure BDA0002857665870000063
And delta is the unbalanced arrangement degree of the throttling window, meets the condition that the delta is less than or equal to 1, and can select a proper delta value according to a specific valve structure and parameters in the actual optimization process.
S4: gradually increasing | delta | through three-dimensional modeling software, wherein delta and the top side length tw of the section of the throttling windowi' has a calculation relationship as shown in S3, so that the top side length tw of the section of the throttle windowiWill vary with the variation in delta, such that wcAnd also changes synchronously. When w isc＝wcminWhen the light path is not parallel to the light path, the corresponding | δ | is recorded as | δmax. Wherein, wcminThe minimum interval design value of the adjacent throttling windows is given according to the service condition and the strength analysis of the valve. Making delta ═ delta-maxJ is a positive integer, and j can be given a value as required in the optimization process, wherein j is more than or equal to 2 generally.
S5: obtaining | delta | through cell according to S4maxIn [ - |. delta. ] non-calculationmax，|δ|max]Sampling within intervalAnd delta, optimizing the top side length of the section of the throttling window according to S3, and performing three-dimensional modeling software to obtain the optimized top side length tw of the section of the throttling windowiRespectively establishing pre-three-dimensional structure models corresponding to different deltas, and adjusting a valve core in the obtained pre-three-dimensional structure model to the maximum opening position to obtain the three-dimensional structure model of the main water supply regulating valve. Wherein the sampling points of delta are respectively- | delta non-wovenmax……-2Δδ、-Δδ、0、Δδ、2Δδ……|δ|max。
S6: and obtaining the runner model corresponding to each three-dimensional structure model in the S5 through three-dimensional modeling software, dispersing each runner model through grid division software to obtain a grid model, and introducing the grid model into computational fluid dynamics software. In the computational fluid dynamics software, boundary condition parameters were set from the design file of S1, and the same fluid properties as in the design file of S1 were given to the entire space occupied by the mesh model.
In this embodiment, the Mesh division software may adopt one of an ICEM CFD, HyperMesh, TGrid, PointWise, ANSA, GridPro, and ANSYS Workbench Mesh. The computational fluid dynamics software may employ one of ANSYS flow, ANSYS CFX, STAR-CD, STAR-CCM, NUMCA, OpenFOAM. The flow channel model refers to a three-dimensional geometric space formed by the areas through which fluid flows in the valve.
S7: a local rectangular coordinate system O ' X ' Y ' Z ' is established in the grid model endowed with the fluid characteristics by taking the centroid point of the valve core 4 in the three-dimensional structure model as a local origin O '. In the local rectangular coordinate system, the Y 'O' Z 'plane coincides with the longitudinal section of the valve, the Z' axis coincides with the axis of the sleeve and the positive direction of the Z 'axis points to the top of the sleeve, and the positive direction of the Y' axis points to the outlet of the valve. Through computational fluid dynamics software, the unbalanced moment M generated by the impact of fluid on the valve core 4 under different deltas in the valve is obtained. The unbalanced moment M is obtained by using the local origin O 'as a rotation center and the X' axis as a rotation axis.
S8: the minimum value M of the unbalance moment in S7 is calculatedminThe corresponding delta is used as the optimized unbalanced arrangement degree delta of the throttling windowo，δoCorresponding sleeve structureNamely the sleeve structure optimized by the method.
Example 1
The embodiment provides a method for optimizing a sleeve throttling window of a main water supply regulating valve, which can overcome unbalanced moment of a valve core, and comprises the following implementation steps:
s1: and constructing a three-dimensional structure original model of the main water supply regulating valve in three-dimensional modeling software according to the original main water supply regulating valve design file. As shown in fig. 1, the obtained three-dimensional original model of the original main water supply regulating valve includes a valve rod 1, a valve cover 2, a gasket 3, a valve core 4, a sleeve 5 and a valve body 6, and the structures of the components of the original main water supply regulating valve can be clearly reflected.
The design file comprises composition information and use condition information of the main water supply regulating valve, wherein the composition information comprises the structure and the size of the main water supply regulating valve, and the use condition information comprises the physical property of introduced fluid, the boundary condition at the outlet of the valve and the boundary condition at the inlet of the valve. In this example, the fluid medium used was 140 ℃ water with a density of 926.1kg/m3Dynamic viscosity of 2.01X 10-4Pa · s. The pressure at the inlet of the valve was 9.65MPa and the pressure at the outlet of the valve was 7.50 MPa.
And establishing a global rectangular coordinate system OXYZ by taking the central point of the bottom surface of the sleeve in the three-dimensional structure original model as an origin O, wherein the YOZ plane is superposed with the longitudinal section of the valve, the Z axis is superposed with the axis of the sleeve and the positive direction of the Z axis points to the top of the sleeve, and the positive direction of the Y axis points to the outlet of the valve. The longitudinal section of the valve is a plane defined by the connecting line of the central point of the inlet surface and the central point of the outlet surface of the valve and the axis of the sleeve. In this embodiment, solid works is adopted as the three-dimensional modeling software.
As shown in fig. 2 to 4, the sleeve is a hollow cylindrical part, is installed inside the main water supply regulating valve, and is clamped between the valve body and the valve cover of the main water supply regulating valve. In the present embodiment, the sleeve is provided with 2 n-6 through-hole throttling windows along the circumferential direction. All the throttling windows are symmetrical about the longitudinal section of the valve, and the intervals between the adjacent throttling windows are the same. Dt in fig. 2 is the radial length of the sleeve.
S2: in the three-dimensional structure original model obtained in S1,the serial numbers i of 1, 2 and 3 are respectively given to the n-3 throttling windows on one side of the longitudinal section of the valve from positive direction to negative direction along the Y axis. Defining the length of the top side of the section of the ith throttling window as twiThe length of the bottom side of the section of the ith throttling window is bwiAnd twi>bwi. The minimum interval of two adjacent throttling windows in the circumferential direction of the sleeve is wc. In this embodiment, the original main water supply regulating valve tw1＝tw2＝tw3＝90mm，tw1＝tw2＝tw3＝8mm。
S3: order to
Figure BDA0002857665870000081
Wherein, twi' is the optimized length of the top side of the section of the throttling window; delta is the unbalanced arrangement degree of the throttling window, and meets the condition that delta is less than or equal to 1; twavgIs the average value of the side length of the top of the section of the throttling window, in this embodiment, twavgSatisfy the requirement of
Figure BDA0002857665870000082
Thus, there are
Figure BDA0002857665870000083
S4: gradually increasing | delta | by three-dimensional modeling software, and gradually increasing wc＝wcminWhile | δ | is recorded as | δmax. In this embodiment, wcmin＝15mm，|δ|max0.5. Making delta ═ delta-maxAnd/j, j is a positive integer. In this example, when j is 5, Δ δ is 0.1.
S5: in [ - |. delta-max，|δ|max]Sampling different deltas in the interval, optimizing the top side length of the section of the throttling window according to S3, and optimizing the optimized top side length tw of the section of the throttling window through three-dimensional modeling softwareiRespectively establishing three-dimensional structure models of the main water supply regulating valve at positions corresponding to different deltas and with the valve core regulated to the maximum opening, wherein sampling points of the deltas are-0 respectively.5……-0.2，-0.1，0，0.1，0.2，……0.5。
S6: and obtaining the runner model corresponding to each three-dimensional structure model in the S5 through three-dimensional modeling software, dispersing each runner model through grid division software to obtain a grid model, and introducing the grid model into computational fluid dynamics software. In the computational fluid dynamics software, boundary condition parameters were set from the design file of S1, and the same fluid properties as in the design file of S1 were given to the entire space occupied by the mesh model. In this embodiment, the mesh partitioning software is Fluent masking, and the computational fluid dynamics software is ANSYS Fluent.
S7: and establishing a local rectangular coordinate system O ' X ' Y ' Z ' by taking the centroid point of the valve core 4 in the three-dimensional structure model as a local origin O '. In a local rectangular coordinate system, a Y 'O' Z 'plane coincides with a longitudinal section of the valve, a Z' axis coincides with the axis of the sleeve and the positive direction of the Z 'axis points to the top of the sleeve, and the positive direction of the Y' axis points to the outlet of the valve. And (3) obtaining the unbalanced moment M generated by the impact of the fluid on the valve core 4 under different deltas through calculating fluid mechanics software. The unbalanced moment M is centered on the local origin O 'and is rotated about the X' axis.
The relationship between the unbalanced moment M of the valve core and the unbalanced arrangement degree delta of the throttling window is calculated and shown in figure 5, and the flow coefficient CvThe relationship with the unbalanced arrangement degree δ of the throttle window is shown in fig. 6.
S8: the minimum value M of the unbalance moment in S7 is calculatedminThe corresponding delta is used as the optimized unbalanced arrangement degree delta of the throttling windowo，δoThe corresponding sleeve structure is an optimized sleeve structure.
In the present embodiment, δoThe optimized sleeve structure is shown in fig. 7 to 9, which is equal to 0.5. As can be seen from FIG. 5, the optimized sleeve structure can reduce the unbalanced moment of the valve core of the main water supply regulating valve by 22.10% relative to the original sleeve, and the reduction is significant. Meanwhile, the optimized sleeve structure enables the flow coefficient of the main water supply regulating valve to be reduced by 2.7% relative to the original sleeve, and the reduction is not obvious.
When large-flow fluid flows through the main water supply regulating valve, uneven pressure distribution can be formed at the bottom of the valve core, and unbalanced moment acts on the valve core. The unbalanced moment can lead the valve core to have the tendency of overturning, increase the friction force between the valve core and the sleeve, damage the sealing surface between the valve core and the sleeve and reduce the service life of the main water supply regulating valve on the one hand, and obstruct the movement of the valve core and influence the control precision of the main water supply regulating valve on the other hand. The method for optimizing the sleeve throttling window of the main water supply regulating valve for overcoming the unbalanced moment of the valve core can obviously reduce the unbalanced moment borne by the valve core on the premise of keeping the flow capacity of the main water supply regulating valve basically unchanged. The optimization method is based on a numerical simulation technology, avoids repeated theoretical formula calculation and experimental check processes, and saves manpower and material resource consumption.
The above embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.

Claims (10)

1. An optimization method for a sleeve throttling window of a main water supply regulating valve is characterized by comprising the following steps:
s1: constructing a three-dimensional structure original model of the target main water supply regulating valve through three-dimensional modeling software according to the design file of the target main water supply regulating valve; establishing a global rectangular coordinate system OXYZ by taking the central point of the bottom surface of the sleeve (5) in the three-dimensional structure original model as an origin O; in the global rectangular coordinate system, a YOZ plane is superposed with a longitudinal section of the valve, a Z axis is superposed with an axis of the sleeve and points to the top of the sleeve in the positive direction, and a Y axis points to an outlet of the valve in the positive direction;
2n through throttling windows are formed in the sleeve (5) of the target main water supply regulating valve along the circumferential direction, n is a natural number and is not less than 2; all the throttling windows are symmetrical about the longitudinal section of the valve, and the intervals between the adjacent throttling windows are the same; the axial section of the throttling window is sequentially a first rectangle, a trapezoid and a second rectangle from top to bottom; the top side of the trapezoid is overlapped with the bottom side of the first rectangle, the bottom side of the trapezoid is overlapped with the top side of the second rectangle, and the length of the top side is larger than that of the bottom side;
s2: in the three-dimensional structure original model, sequence numbers i of 1 and 2 … … n are respectively assigned to n throttling windows on one side of a longitudinal section of the valve from positive direction to negative direction along the Y axis; defining the length of the top side of the section of the ith throttling window as twiThe length of the bottom side of the section of the ith throttling window is bwiAnd twi>bwi(ii) a The minimum interval of two adjacent throttling windows in the circumferential direction of the sleeve is wc；twi、bwiAnd wcAre all positive numbers;
s3: selecting the following operation pairs tw alternatively according to the parity of niOptimizing;
when n is an even number, let
Figure FDA0002857665860000011
When n is an odd number, let
Figure FDA0002857665860000012
Wherein, twi' is the optimized length of the top side of the section of the throttling window; twavgIs the average value of the side length of the top part of the section of the throttling window, and meets the requirement
Figure FDA0002857665860000021
Delta is the unbalanced arrangement degree of the throttling window, and meets the condition that delta is less than or equal to 1;
s4: gradually increasing | delta | by three-dimensional modeling software, and gradually increasing wc＝wcminWhile | δ | is recorded as | δmax(ii) a Wherein, wcminIs the minimum interval design value of the adjacent throttling windows; making delta ═ delta-maxJ is a positive integer;
s5: in [ - |. delta-max，|δ|max]Samples different deltas within the interval and throttles the window according to S3Optimizing the top side length of the port section, and optimizing the top side length tw of the throttling window section by three-dimensional modeling softwareiRespectively establishing three-dimensional structure models of the main water supply regulating valve under different delta correspondences and with the valve core regulated to the maximum opening, wherein the sampling points of delta are respectively- | delta tintmax……-2Δδ、-Δδ、0、Δδ、2Δδ……|δ|max；
S6: obtaining a runner model corresponding to each three-dimensional structure model in S5 through three-dimensional modeling software, dispersing each runner model through grid division software to obtain a grid model, and introducing the grid model into computational fluid dynamics software; in the computational fluid dynamics software, boundary condition parameters are set according to the design file of S1, and the same fluid properties as those in the design file of S1 are given to the whole space occupied by the mesh model;
s7: establishing a local rectangular coordinate system O ' X ' Y ' Z ' by taking a centroid point of the valve core (4) in the three-dimensional structure model as a local origin O '; in the local rectangular coordinate system, a Y 'O' Z 'plane is superposed with a longitudinal section of the valve, a Z' axis is superposed with the axis of the sleeve and the positive direction of the Z 'axis points to the top of the sleeve, and the positive direction of the Y' axis points to the outlet of the valve; obtaining unbalanced moment M generated by the valve cores (4) under different deltas under the impact of fluid through the computational fluid dynamics software; the unbalanced moment M takes a local original point O 'as a rotation center and takes an X' axis as a rotation axis;
s8: the minimum value M of the unbalance moment in S7 is calculatedminThe corresponding delta is used as the optimized unbalanced arrangement degree delta of the throttling windowo，δoThe corresponding sleeve structure is an optimized sleeve structure.
2. The optimization method according to claim 1, wherein in S1, the three-dimensional modeling software is one of Solidworks, Creo, Inventor, UG/NX, CATIA, ANSYS Workbench design model, and ANSYS Workbench.
3. The optimization method according to claim 1, wherein in the S1, the design file includes composition information and use condition information of the target main water supply regulating valve.
4. The optimization method of claim 3, wherein the composition information includes structure, dimensions, and material properties of a target feedwater regulating valve.
5. The optimization method according to claim 3, wherein the information of the use condition comprises physical properties of the fluid introduced into the target main water supply regulating valve, a boundary condition at the outlet of the valve and a boundary condition at the inlet of the valve.
6. The optimization method according to claim 1, wherein in S1, the longitudinal valve section is a plane defined by a line connecting the center point of the inlet face and the center point of the outlet face of the valve and the axis of the sleeve (5).
7. The optimization method according to claim 1, wherein in S1, the sleeve (5) is a hollow cylindrical part, is mounted inside the main water supply regulating valve, and is clamped between the main water supply regulating valve body (6) and the valve cover (2).
8. The optimization method according to claim 1, wherein in S6, the Mesh partition software is one of an ICEM CFD, HyperMesh, TGrid, PointWise, ANSA, GridPro, ANSYS Workbench Mesh.
9. The optimization method according to claim 1, wherein in S6, the computational fluid dynamics software is one of ANSYS Fluent, ANSYS CFX, STAR-CD, STAR-CCM, NUMECA, OpenFOAM.
10. The optimization method of claim 1, wherein in S6, the flow path model is a three-dimensional geometric space formed by a flow area of the fluid flowing through the valve.
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