CN105404749B - A kind of modeling method of check valve - Google Patents
A kind of modeling method of check valve Download PDFInfo
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- CN105404749B CN105404749B CN201510873436.6A CN201510873436A CN105404749B CN 105404749 B CN105404749 B CN 105404749B CN 201510873436 A CN201510873436 A CN 201510873436A CN 105404749 B CN105404749 B CN 105404749B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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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
- F16K15/00—Check valves
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Abstract
The invention discloses a kind of modeling methods of check valve.Operation principle based on check valve, from the kinetics equation of flap component, it establishes the check valve modeling of complete set, calculate and simulation process method, the high-precision dynamic analysis of Steam Power Equipment water supply system containing check valve can be used for, can be used for instructing the optimization design of check valve.
Description
Technical field
The invention belongs to Steam Power Equipment water supply system technical field, more particularly, to a kind of check valve
Modeling method.
Background technology
For Steam Power Equipment water supply system in underrun, required feedwater flow is smaller, if feed pump is low
It works under flow, then feed temperature is likely to be breached overheat, and the steam of generation makes feed pump that cavitation occur, can cause the damage of feed pump
It is bad, and phenomena such as various noises are with vibrating is generated, on the other hand, pump shaft can be caused by the radial load increased, long-play
The fatigue damage of pump shaft.To avoid the generation of above-mentioned phenomenon, check valve usually on feed pump export pipeline is installed, both may be used
The refluence of medium is prevented, and the idle discharge amount of feed pump according to the output flow of feed pump, can be adjusted, by the minimum stream for maintaining pump
Amount ensures the safe operation of feed pump normal work and water supply system.
Flap component difference force, impulsive force, gravity, spring force and damping force before and after flap in check valve
It is moved under comprehensive function.When the flow for flowing through valve is reduced, difference force and impulsive force reduce before and after flap, flap band
Ovable valve stem is moved to valve seat direction, and when the output flow of feed pump is less than defined idle discharge flow, the flow for maintaining pump is sky
Discharge capacity；When the flow for flowing through valve increases, difference force and impulsive force increase before and after flap, flap band ovable valve stem is to separate
Valve seat direction is moved, and when output flow is more than defined idle discharge flow, idle discharge mouth completely closes, and feedwater flow is pump stream stream
Amount.
The design analysis of check valve is substantially based on stable state calculating, the idle discharge non-return when bistable design operating mode is run
Valve disclosure satisfy that feed pump stable operation requirement, but when load variations, water supply system resistance, feed pump hydrodynamic force are special
Property will vary widely.On the one hand, from the angle of operational safety, it is highly desirable to carry out water supply system under varying load condition
Dynamic analysis, and check valve computation model it is accurate whether directly determine the essence of water supply system dynamic analysis
Degree；On the other hand, can the simulation analysis of water supply system Dynamic High-accuracy characteristic can enough meet system to the design of check valve
The requirement of system is verified.To go the dynamics of accurate simulation check valve special however, there is presently no a kind of effective methods
Property.
Invention content
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of modeling sides of check valve
Method is simulated, flap component Gravity calculation including check valve hydraulic characteristic, spring force modeling, check valve mainstream
Upstream and downstream difference force calculates, and main flow direction valve impulsive force calculates, and damping force calculates and check valve dynamics is built
Mould, its object is to the kinetic characteristics of accurate simulation check valve, moreover it can be used to instruct the optimization design of check valve.
To achieve the above object, one side according to the invention provides a kind of modeling method of check valve,
It is characterized in that, includes the following steps：
(1) current time T=1 is enabled, initializes the main flow direction valve opening v at 0 momentpm0, flap component movement velocity
V0With the Lift h of flap component0；
(2) the main flow direction flow G of current time T is obtainedmT, main flow direction inlet pressure PiT, main flow direction outlet pressure
PmoT, main flow direction fluid density ρmT, idle discharge direction fluid density ρkTWith the fluid density ρ in damping holedT；
(3) the spring force F of current time T is calculatedsT=ks(x0+hT-1), wherein, ksFor the elastic coefficient, x0For valve
The initial compression amount of spring, h when valve is fully closedT-1The Lift of flap component for previous moment T-1；
(4) the flap upstream and downstream difference force F of current time T is calculateddpT=(PiT-PmoT)A0Cdp, wherein, A0For valve flap surface
Product,For pressure difference correction factor, GgFor flap component gravity, Fs0Initial compression for flap spring when fully closed
Power, Δ PminThe minimum differntial pressure of flap upper and lower surface when being opened for flap；
(5) impulsive force suffered by the main flow direction flap of current time T is calculated
Wherein, | GmT| it is GmTAbsolute value, vpm(T-1)For previous moment T-
1 main flow direction valve opening, ff() is mainstream direction valve aperture-impulsive force function；
(6) damping force that damping hole generates when calculating the flap component movement of current time T
Wherein, VT-1The movement of flap component for previous moment T-1
Speed, | VT-1| it is VT-1Absolute value, ζdFor the form drag coefficient of damping hole, λ is the friction coefficient in damping hole duct, and L is resistance
Buddhist nun's hole length, ddTo damp bore dia, AgFor valve rod sectional area, AdFor damping hole sectional area；
(7) the spring force F of current time T is utilizedsT, flap upstream and downstream difference force FdpT, flow suffered by main flow direction flap
Impulse force FfTThe damping force F generated with damping hole during flap component movementdT, calculate the movement acceleration of the flap component of current time T
DegreeWherein, m is the gross mass of flap component；
(8) according to the acceleration of motion a of the flap component of current time TT, the flap component of current time T is calculated
Movement velocity VT, flap component Lift hT, main flow direction valve opening vpmTWith idle discharge direction valve aperture vpkTRespectively
For：
VT=VT-1+aTΔ t,
hT=hT-1+VTΔ t,
With
Wherein, Δ t be time step, hkThe Lift of flap, h when for idle discharge flow being just zeromaxMaximum for flap
Lift；
(9) according to the main flow direction valve opening v of current time TpmTWith idle discharge direction valve aperture vpkT, when calculating current
Carve the main flow direction valve admittance a of TmTWith idle discharge direction valve admittance akTAnd it exports；
(10) T=T+1, return to step (2) are enabled.
Preferably, in the step (5), main flow direction valve opening-impulsive force function ff() obtains in the following way
It arrives：
According to main flow direction inlet outlet pressure differential Δ Pm, main flow direction fluid density ρmWith the reality of the Lift h of flap component
Data are tested, main flow direction valve opening is calculated respectivelySpring force FsWith flap upstream and downstream difference force Fdp,
And then it is calculatedWherein, hmaxFor the maximum Lift of flap, Ff=Gg+Fs-FdpFor mainstream direction valve valve
Suffered impulsive force, according to main flow direction valve opening vpmSequence from small to large, obtains about (vpm,ff) one group of data,
Labeled as (vpm,i,ff,i), i=1,2 ..., I, I be data count in this group of data；
Enable ffThe input quantity of () is x, then has：
Preferably, in the step (9), the main flow direction valve admittance a of current time TmT=fm(vpmT), current time T
Idle discharge direction valve admittance akT=fk(vpkT), wherein, fm() be mainstream direction valve resistance fitting function, fk() is idle discharge
Direction valve resistance fitting function.
Preferably, main flow direction valve resistance fitting function fm() obtains in the following way：
According to main flow direction flow Gm, main flow direction inlet outlet pressure differential Δ Pm, main flow direction fluid density ρmWith flap component
Lift h experimental data, main flow direction valve opening is calculated respectivelyWith main flow direction valve admittanceAccording to main flow direction valve opening vpmSequence from small to large, obtains about (vpm,am) one group of data, mark
It is denoted as (vpm,j,am,j), j=1,2 ..., J, J be data count in this group of data；
Enable fmThe input quantity of () is y, then has：
Preferably, idle discharge direction valve resistance fitting function fk() obtains in the following way：
According to idle discharge directional flow Gkp, idle discharge direction inlet outlet pressure differential Δ Pk, idle discharge direction fluid density ρkpWith flap group
Idle discharge direction valve aperture is calculated in the experimental data of the Lift h of part respectivelyWith idle discharge direction valve
AdmittanceAccording to idle discharge direction valve aperture vpkSequence from small to large, obtains about (vpk,ak) one group of number
According to labeled as (vpk,r,ak,r), r=1,2 ..., R, R be data count in this group of data；
Enable fkThe input quantity of () is z, then has：
In general, by the above technical scheme conceived by the present invention compared with prior art, have below beneficial to effect
Fruit：Operation principle based on check valve, from the kinetics equation of flap component, the idle discharge for establishing complete set is stopped
Valve modeling, calculating and simulation process method are returned, it is high-precision that the Steam Power Equipment water supply system containing check valve can be used for
Dynamic analysis can be used for instructing the optimization design of check valve.
Description of the drawings
Fig. 1 is the modeling method flow chart of the check valve of the embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
As shown in Figure 1, the modeling method of the check valve of the embodiment of the present invention includes the following steps：
(1) current time T=1 is enabled, initializes the main flow direction valve opening v at 0 momentpm0, flap component movement velocity
V0With the Lift h of flap component0；
(2) the main flow direction flow G of current time T is obtainedmT, main flow direction inlet pressure PiT, main flow direction outlet pressure
PmoT, main flow direction fluid density ρmT, idle discharge direction fluid density ρkTWith the fluid density ρ in damping holedT；
(3) the spring force F of current time T is calculatedsT=ks(x0+hT-1), wherein, ksFor the elastic coefficient, x0For valve
The initial compression amount of spring, h when valve is fully closedT-1The Lift of flap component for previous moment T-1；
(4) the flap upstream and downstream difference force F of current time T is calculateddpT=(PiT-PmoT)A0Cdp, wherein, A0For valve flap surface
Product,For pressure difference correction factor, GgFor flap component gravity, Fs0Initial compression for flap spring when fully closed
Power, Δ PminThe minimum differntial pressure of flap upper and lower surface when being opened for flap；
(5) impulsive force suffered by the main flow direction flap of current time T is calculated
Wherein, | GmT| it is GmTAbsolute value, vpm(T-1)For previous moment T-
1 main flow direction valve opening, ff() is mainstream direction valve aperture-impulsive force function；
Specifically, impulsive force suffered by main flow direction flap is：
Wherein, CfFor impulsive force correction factor, GmFor mainstream directional flow, | Gm| it is GmAbsolute value, A is fluid
Circulation area, ρmFor main flow direction fluid density.
In simulation modeling, the hydraulic characteristic of check valve main flow direction and idle discharge direction is simulated with two valves, is drawn
Enter the concept of admittance in circuit.For check valve main flow direction, have：Wherein, amFor mainstream direction valve
Admittance, Δ PmFor main flow direction inlet outlet pressure differential, convolution (1) obtains impulsive force and is：Due to mainstream
Direction valve admittance amWith main flow direction valve opening vpmCorrelation, impulsive force correction factor is also related to valve opening, by mainstream side
To impulsive force F suffered by flapfIt is expressed as main flow direction valve opening vpmFunction, obtain：
ff() obtains in the following way：
According to main flow direction inlet outlet pressure differential Δ Pm, main flow direction fluid density ρmWith the reality of the Lift h of flap component
Data are tested, main flow direction valve opening is calculated respectively(hmaxMaximum Lift for flap), spring bullet
Power FsWith flap upstream and downstream difference force Fdp, and then be calculatedWherein, Ff=Gg+Fs-Fdp, according to main flow direction
Valve opening vpmSequence from small to large, obtains about (vpm,ff) one group of data, labeled as (vpm,i,ff,i), i=1,
2 ..., I, I be data count in this group of data；
Enable ffThe input quantity of () is x, then has：
Wherein,For ff,i-1'sPower,For ff,i'sPower.
(6) damping force that damping hole generates when calculating the flap component movement of current time T
Wherein, VT-1The movement of flap component for previous moment T-1
Speed, | VT-1| it is VT-1Absolute value, ζdFor the form drag coefficient of damping hole, λ is the friction coefficient in damping hole duct, and L is resistance
Buddhist nun's hole length, ddTo damp bore dia, AgFor valve rod sectional area, AdFor damping hole sectional area；
(7) the spring force F of current time T is utilizedsT, flap upstream and downstream difference force FdpT, flow suffered by main flow direction flap
Impulse force FfTThe damping force F generated with damping hole during flap component movementdT, calculate the movement acceleration of the flap component of current time T
DegreeWherein, m is the gross mass of flap component；
(8) according to the acceleration of motion a of the flap component of current time TT, the flap component of current time T is calculated
Movement velocity VT, flap component Lift hT, main flow direction valve opening vpmTWith idle discharge direction valve aperture vpkTRespectively
For：
VT=VT-1+aTΔ t,
hT=hT-1+VTΔ t,
With
Wherein, Δ t be time step, hkThe Lift of flap when for idle discharge flow being just zero；
When carrying out numerical computations, to hT、vpmTAnd vpkTLimit value is carried out, limits are 0≤hT≤hmax, 0≤vpmT≤1
With 0≤vpkT≤1。
(9) according to the main flow direction valve opening v of current time TpmTWith idle discharge direction valve aperture vpkT, when calculating current
Carve the main flow direction valve admittance a of TmTWith idle discharge direction valve admittance akTAnd it exports；
Specifically, amT=fm(vpmT), akT=fk(vpkT), wherein, fm() be mainstream direction valve resistance fitting function, fk
() is idle discharge direction valve resistance fitting function；
fm() obtains in the following way：
According to main flow direction flow Gm, main flow direction inlet outlet pressure differential Δ Pm, main flow direction fluid density ρmWith flap component
Lift h experimental data, main flow direction valve opening is calculated respectivelyWith main flow direction valve admittanceAccording to main flow direction valve opening vpmSequence from small to large, obtains about (vpm,am) one group of data, mark
It is denoted as (vpm,j,am,j), j=1,2 ..., J, J be data count in this group of data；
Enable fmThe input quantity of () is y, then has：
Wherein,For am,j-1'sPower,For am,j'sPower.
fk() obtains in the following way：
According to idle discharge directional flow Gkp, idle discharge direction inlet outlet pressure differential Δ Pk, idle discharge direction fluid density ρkpWith flap group
Idle discharge direction valve aperture is calculated in the experimental data of the Lift h of part respectivelyWith idle discharge direction valve
AdmittanceAccording to idle discharge direction valve aperture vpkSequence from small to large, obtains about (vpk,ak) one group of number
According to labeled as (vpk,r,ak,r), r=1,2 ..., R, R be data count in this group of data；
Enable fkThe input quantity of () is z, then has：
Wherein,For ak,r-1'sPower,For ak,r'sPower.
(10) T=T+1, return to step (2) are enabled.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made all within the spirits and principles of the present invention etc., should all include
Within protection scope of the present invention.
Claims (5)
1. a kind of modeling method of check valve, which is characterized in that include the following steps：
(1) current time T=1 is enabled, initializes the main flow direction valve opening v at 0 momentpm0, flap component movement velocity V0With
The Lift h of flap component0；
(2) the main flow direction flow G of current time T is obtainedmT, main flow direction inlet pressure PiT, main flow direction outlet pressure PmoT、
Main flow direction fluid density ρmT, idle discharge direction fluid density ρkTWith the fluid density ρ in damping holedT；
(3) the spring force F of current time T is calculatedsT=ks(x0+hT-1), wherein, ksFor the elastic coefficient, x0It is complete for flap
The initial compression amount of spring, h during passT-1The Lift of flap component for previous moment T-1；
(4) the flap upstream and downstream difference force F of current time T is calculateddpT=(PiT-PmoT)A0Cdp, wherein, A0For flap area,For pressure difference correction factor, GgFor flap component gravity, Fs0For the initial compression force of flap spring when fully closed,
ΔPminThe minimum differntial pressure of flap upper and lower surface when being opened for flap；
(5) impulsive force suffered by the main flow direction flap of current time T is calculated
Wherein, | GmT| it is GmTAbsolute value, vpm(T-1)For previous moment T-1
Main flow direction valve opening, ff() is mainstream direction valve aperture-impulsive force function；
(6) damping force that damping hole generates when calculating the flap component movement of current time T
Wherein, VT-1The movement of flap component for previous moment T-1
Speed, | VT-1| it is VT-1Absolute value, ζdFor the form drag coefficient of damping hole, λ is the friction coefficient in damping hole duct, and L is resistance
Buddhist nun's hole length, ddTo damp bore dia, AgFor valve rod sectional area, AdFor damping hole sectional area；
(7) the spring force F of current time T is utilizedsT, flap upstream and downstream difference force FdpT, impulsive force suffered by main flow direction flap
FfTThe damping force F generated with damping hole during flap component movementdT, the acceleration of motion of the flap component of calculating current time TWherein, m is the gross mass of flap component；
(8) according to the acceleration of motion a of the flap component of current time TT, the movement of the flap component of current time T is calculated
Speed VT, flap component Lift hT, main flow direction valve opening vpmTWith idle discharge direction valve aperture vpkTRespectively：
VT=VT-1+aTΔ t,
hT=hT-1+VTΔ t,
With
Wherein, Δ t be time step, hkThe Lift of flap, h when for idle discharge flow being just zeromaxMaximum for flap is opened
Highly；
(9) according to the main flow direction valve opening v of current time TpmTWith idle discharge direction valve aperture vpkT, calculate current time T
Main flow direction valve admittance amTWith idle discharge direction valve admittance akTAnd it exports；
(10) T=T+1, return to step (2) are enabled.
2. the modeling method of check valve as described in claim 1, which is characterized in that in the step (5), main flow direction
Valve opening-impulsive force function ff() obtains in the following way：
According to main flow direction inlet outlet pressure differential Δ Pm, main flow direction fluid density ρmWith the experiment number of the Lift h of flap component
According to main flow direction valve opening is calculated respectivelySpring force FsWith flap upstream and downstream difference force Fdp, and then
It is calculatedWherein, hmaxFor the maximum Lift of flap, Ff=Gg+Fs-FdpFor suffered by mainstream direction valve valve
Impulsive force, according to main flow direction valve opening vpmSequence from small to large, obtains about (vpm,ff) one group of data, label
For (vpm,i,ff,i), i=1,2 ..., I, I be data count in this group of data；
Enable ffThe input quantity of () is x, then has：
3. the modeling method of check valve as claimed in claim 1 or 2, which is characterized in that in the step (9), currently
The main flow direction valve admittance a of moment TmT=fm(vpmT), the idle discharge direction valve admittance a of current time TkT=fk(vpkT),
In, fm() be mainstream direction valve resistance fitting function, fk() is idle discharge direction valve resistance fitting function.
4. the modeling method of check valve as claimed in claim 3, which is characterized in that main flow direction valve resistance is fitted letter
Number fm() obtains in the following way：
According to main flow direction flow Gm, main flow direction inlet outlet pressure differential Δ Pm, main flow direction fluid density ρmWith opening for flap component
The experimental data of height h is opened, main flow direction valve opening is calculated respectivelyWith main flow direction valve admittanceAccording to main flow direction valve opening vpmSequence from small to large, obtains about (vpm,am) one group of data, mark
It is denoted as (vpm,j,am,j), j=1,2 ..., J, J be data count in this group of data；
Enable fmThe input quantity of () is y, then has：
5. the modeling method of check valve as claimed in claim 3, which is characterized in that idle discharge direction valve resistance is fitted letter
Number fk() obtains in the following way：
According to idle discharge directional flow Gkp, idle discharge direction inlet outlet pressure differential Δ Pk, idle discharge direction fluid density ρkpWith flap component
Idle discharge direction valve aperture is calculated in the experimental data of Lift h respectivelyWith idle discharge direction valve admittanceAccording to idle discharge direction valve aperture vpkSequence from small to large, obtains about (vpk,ak) one group of data, mark
It is denoted as (vpk,r,ak,r), r=1,2 ..., R, R be data count in this group of data；
Enable fkThe input quantity of () is z, then has：
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| CN201510873436.6A CN105404749B (en) | 2015-12-02 | 2015-12-02 | A kind of modeling method of check valve |
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| CN109306979B (en) * | 2018-10-29 | 2020-05-08 | 北京航天发射技术研究所 | Mechanical hydraulic throttling control valve design method based on mechanism displacement speed planning |
| CN113051687A (en) * | 2021-04-01 | 2021-06-29 | 珠海格力智能装备有限公司 | Method and device for processing flow field of check valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2218499C2 (en) * | 2001-09-24 | 2003-12-10 | Кузьмин Станислав Васильевич | Adjusting valve bearing sleeve |
| CN104819323A (en) * | 2014-12-24 | 2015-08-05 | 刘泽华 | Water hammer self-balancing swing one-way valve |
-
2015
- 2015-12-02 CN CN201510873436.6A patent/CN105404749B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2218499C2 (en) * | 2001-09-24 | 2003-12-10 | Кузьмин Станислав Васильевич | Adjusting valve bearing sleeve |
| CN104819323A (en) * | 2014-12-24 | 2015-08-05 | 刘泽华 | Water hammer self-balancing swing one-way valve |
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| Title |
|---|
| An analysis of check valve performance characteristics based on valve design;K.L. McElhaney;《Nuclear Engineering and Design》;20000430;第197卷(第1-2期);第169-182页 * |
| LYHT空排止回阀设计;任祥云 等;《阀门》;19990930(第3期);第11-13页 * |
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| 轴流式止回阀关闭过程的可靠性数值模拟;蔡毅卿;《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》;20130115(第1期);全文 * |
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