CN102537382A - Simple and easy determining method of three-eccentric center butterfly valve seal surface dimension interference - Google Patents
Simple and easy determining method of three-eccentric center butterfly valve seal surface dimension interference Download PDFInfo
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- CN102537382A CN102537382A CN2012100471299A CN201210047129A CN102537382A CN 102537382 A CN102537382 A CN 102537382A CN 2012100471299 A CN2012100471299 A CN 2012100471299A CN 201210047129 A CN201210047129 A CN 201210047129A CN 102537382 A CN102537382 A CN 102537382A
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Abstract
The invention relates to a three-eccentric center butterfly valve, and in particular relates to a simple and easy determining method of three-eccentric center butterfly valve seal surface dimension interference. The method provided by the invention comprises the steps of: determining the design parameters; building a coordinate system, carrying out numerical discrete processing, determining the subarea and determining. Through the method, whether the butterfly valve seal surface is subjected to interference can be determined, and the particular position of the interference area can be determined.
Description
Technical field
The present invention relates to three-eccentric-butterfly-valve, specifically, it is related to a kind of simple decision method of three-eccentric-butterfly-valve size of seal contact face interference.
Background technology
Three-eccentric-butterfly-valve is due to that with special three eccentricity combining structure, can realize that the moment between valve plate and valve seat departs from or closed when butterfly valve is opened and closed, and after unlatching, valve plate, there is no interference, so as to greatly reduce frictional force, improves the durability of valve with valve seat；This structure is also beneficial to improve sealing property；Under the conditions of identical applied moment, the more other butterfly valves of three-eccentric-butterfly-valve have better seal performance, in addition, three-eccentric-butterfly-valve can also bear the pressure difference bigger than other butterfly valves, therefore, three-eccentric-butterfly-valve is widely used in various industrial productions.
Compared to other types of butterfly valve, the structure of three-eccentric-butterfly-valve is increasingly complex, and this just proposes higher requirement to product design.The problem of wherein size of seal contact face is interfered protrudes the most；Once generation dimensional interference, frequently can lead to leakage or stucking phenomena, while can also cause extra fretting wear, so as to largely effect on the using effect and service life of three-eccentric-butterfly-valve；In the design process of three-eccentric-butterfly-valve, its sealing surface design parameter（Particularly three obliquely intersecteds）Selection it is extremely important, and be how to judge whether design parameter can cause the appearance of dimensional interference phenomenon the problem of to the most critical of sealing surface Parameters Optimal Design；Due to the complexity of three-eccentric-butterfly-valve sealing surface parameter inner link, judge whether dimensional interference occur frequently with empirical parameter combination 3 d modeling software in engineering design, usually require to correct repeatedly to debug using this design cycle and could obtain preferable design parameter, therefore inevitably lead to the reduction of design accuracy and the extension of design cycle.
The content of the invention
A kind of simple decision method of three-eccentric-butterfly-valve size of seal contact face interference, is that can determine that whether butterfly valve seal face can interfere by this method, while can also judge the particular location of interference region, it is characterised in that carry out according to the following steps（Such as Fig. 1）：
1）Determine design parameter
Obtain and determine 5 main design parameters of three-eccentric-butterfly-valve sealing surface（Fig. 2）：The length of valve plate neutral surface transverseD max , valve plate thickness bet, it is axially eccentricc, radial disbalancee, and angle bias
。
2）Set up coordinate system
Summit to seal circular conical surface is x-axis perpendicular to valve plate in-plane, rectangular coordinate system is set up for y-axis parallel to the oval long axis direction of valve plate neutral surface as origin（Fig. 3）；Valve plate thickness ist, two intercept sideways in x-axis is respectivelyx 1 Withx 2 , the oval long axis length of its neutral surfaceD max ；Coordinate of the center of rotating shaft 3 in x/y plane is P（x 0 ,y 0 ）, the cone angle of sealing circular conical surface is 2
； ,。
3）Numerical discretization processing
To avoid solution and the complexity of judgement of the non-linear generation of Mathematical Modeling in itself, numerical value judgement is carried out using discrete method；Specifically, using z as primary variables, by its domain of definition：
Some deciles are divided into, and successively to variable z values；According to the symmetry of butterfly valve axially symmetric structure and coordinate system, can only it be investigated during practical operationInterval, the result of rest interval can be obtained according to symmetry；For reduction trueness error caused by discrete processes as far as possible, interval is quantized after being at least divided into more than 100 grades point to variable z；For example variable z value can be taken as 0,,,
...,
。
4）Determine subregion
Assuming that have one parallel to x/y plane plane z=z0, z0For the centrifugal pump taken in step 3 to variable z.Two sections or one section of hyperbola are then intercepted on valve plate circular conical surface according to the plane, then in x/y plane, y domain of definition can be divided into two or a region；Specifically, when
When, plane z=z0Two sections of hyperbolas, i.e. y domain of definition are intercepted on valve plate circular conical surface and is divided into two intervals；When
When, plane z=z0It is only an interval that one section of hyperbola, i.e. y domain of definition are intercepted on valve plate circular conical surface；
。
5）Judge
In z=z0In plane, it is assumed that M1（
,
, z0）For any point on hyperbolic line segment（Fig. 4）；After valve plate is opened, M1Turned clockwise around P points
Angle, is reached
Point, corresponding point is M in the angle, valve seat2（
,
, z0）.Valve plate and valve seat during valve opening is then set not interfere, then its necessary and sufficient condition is：
, i.e.,；In view of M1Point and
The arbitrariness of angle,
It is equivalent to again：Any point M (x, y, z on hyperbolic line segment0) and P (x0,y0,z0) point the distance between function f (y) exist（x1, x2）It is interval（x1<x2）It is interior on y monotone increasings；Due to always there is f (y)>0, therefore the condition is also equivalent to
For monotonic increasing function, i.e.,
During judgement, constitutive equations（1）In function g (y)；Bring each z value of the interval interior discrete acquisition of z domain of definition into inequality（2）Middle once to be judged, inequality is set up and is then recorded as 1, is otherwise 0；According to record result, if all 1, dimensional interference will not occur completely, if being not all 1, corresponding to 0 z values be on sealing surface by generation dimensional interference region z coordinate value.
Brief description of the drawings
Fig. 1 is the operational flowchart of the present invention；
Fig. 2 is three-eccentric-butterfly-valve structural representation；
Fig. 3 is the coordinate system schematic diagram set up for three-eccentric-butterfly-valve；
Fig. 4 is checking interference schematic diagram；
1 valve seat；2 valve plates；3 rotating shafts.
Embodiment
Embodiment 1：
1）Determine design parameter
Obtain and determine 5 main design parameters of three-eccentric-butterfly-valve sealing surface：The length of valve plate neutral surface transverseD max =250 mm, valve plate thickness aretIt is=14 mm, axially eccentricc=10 mm, radial disbalancee=20 mm, and angle are eccentric
=13 °.
2）Set up coordinate system
Summit to seal circular conical surface is x-axis perpendicular to valve plate in-plane, rectangular coordinate system is set up for y-axis parallel to the oval long axis direction of valve plate neutral surface as origin；Valve plate thickness ist, two intercept sideways in x-axis is respectivelyx 1 Withx 2 , the oval long axis length of its neutral surfaceD max ；Coordinate of the valve plate rotation axis in x/y plane is P（x 0 ,y 0 ）, the cone angle of sealing circular conical surface is 2
。
3）Numerical discretization processing
Using z as primary variables, by its domain of definition：Progress is equidistantly discrete, and variable z value is followed successively by 0,1.216,2.432,3.648 ..., and 121.6mm。
4）Determine subregion
When
When, plane z=z0Two sections of hyperbolas, i.e. y domain of definition are intercepted on valve plate circular conical surface and is divided into two intervals；WhenWhen, plane z=z0It is only an interval that one section of hyperbola, i.e. y domain of definition are intercepted on valve plate circular conical surface.
5）Judge
Construction
；Bring each z value of the interval interior discrete acquisition of z domain of definition into inequality
Middle once to be judged, inequality is set up and is then recorded as 1, is otherwise 0；According to record result；Obtain result：When
When, as a result all it is 1；When
When, as a result all it is 0；As a result illustrate：Can occur dimensional interference, and interference region is that z coordinate is met on sealing surface
Region.
Embodiment 2：
1）Determine design parameter
Obtain and determine 5 main design parameters of three-eccentric-butterfly-valve sealing surface：The length of valve plate neutral surface transverseD max =250 mm, valve plate thickness aretIt is=14 mm, axially eccentricc=10 mm, radial disbalancee=40 mm, and angle are eccentric
=13 °.
2）Set up coordinate system
Summit to seal circular conical surface is x-axis perpendicular to valve plate in-plane, rectangular coordinate system is set up for y-axis parallel to the oval long axis direction of valve plate neutral surface as origin；Valve plate thickness ist, two intercept sideways in x-axis is respectivelyx 1 Withx 2 , the oval long axis length of its neutral surfaceD max , coordinate of the valve plate rotation axis in x/y plane is P（x 0 ,y 0 ）.The cone angle for sealing circular conical surface is 2
。
3）Numerical discretization processing
Using z as primary variables, by its domain of definition：Progress is equidistantly discrete, and variable z value is followed successively by 0,1.216,2.432,3.648 ..., and 121.6mm。
4）Determine subregion
When
When, plane z=z0Two sections of hyperbolas, i.e. y domain of definition are intercepted on valve plate circular conical surface and is divided into two intervals；WhenWhen, plane z=z0It is only an interval that one section of hyperbola, i.e. y domain of definition are intercepted on valve plate circular conical surface.
5）Judge
Construction
；Bring each z value of the interval interior discrete acquisition of z domain of definition into inequality
Middle once to be judged, inequality is set up and is then recorded as 1, is otherwise 0；According to record result；Obtain result：When
Or
When, as a result all it is 1；When, as a result all it is 0；As a result illustrate：Can occur dimensional interference, and interference region is that z coordinate is met on sealing surface
Region.
Embodiment 3：
1）Determine design parameter
Obtain and determine 5 main design parameters of three-eccentric-butterfly-valve sealing surface：The length of valve plate neutral surface transverseD max =240 mm, valve plate thickness aretIt is=14 mm, axially eccentricc=30 mm, radial disbalancee=10 mm, and angle are eccentric
=14 °.
2）Set up coordinate system
Summit to seal circular conical surface is x-axis perpendicular to valve plate in-plane, rectangular coordinate system is set up for y-axis parallel to the oval long axis direction of valve plate neutral surface as origin；Valve plate thickness ist, two intercept sideways in x-axis is respectivelyx 1 Withx 2 , the oval long axis length of its neutral surfaceD max ；Coordinate of the valve plate rotation axis in x/y plane is P（x 0 ,y 0 ）, the cone angle of sealing circular conical surface is 2
。
3）Numerical discretization processing
Using z as primary variables, by its domain of definition：
Progress is equidistantly discrete, and variable z value is followed successively by 0,1.162,2.324,3.486 ..., and 116.2mm。
4）Determine subregion
When
When, plane z=z0Two sections of hyperbolas, i.e. y domain of definition are intercepted on valve plate circular conical surface and is divided into two intervals；When
When, plane z=z0It is only an interval that one section of hyperbola, i.e. y domain of definition are intercepted on valve plate circular conical surface.
5）Judge
Construction
；Bring each z value of the interval interior discrete acquisition of z domain of definition into inequality
Middle once to be judged, inequality is set up and is then recorded as 1, is otherwise 0, according to record result, obtains result：When
When, all it is as a result 1, that is, illustrates on this sealing surface all without generation dimensional interference.
Claims (3)
1. a kind of simple decision method of three-eccentric-butterfly-valve size of seal contact face interference, comprises the following steps：
1）Determine design parameter
Obtain and determine 5 main design parameters of three-eccentric-butterfly-valve sealing surface：The length of valve plate neutral surface transverseD max , valve plate thickness bet, it is axially eccentricc, radial disbalanceeAnd angle is eccentric
；
2）Set up coordinate system
Summit to seal circular conical surface is x-axis perpendicular to valve plate in-plane, rectangular coordinate system is set up for y-axis parallel to the oval long axis direction of valve plate neutral surface as origin；Valve plate thickness ist, two intercept sideways in x-axis is respectivelyx 1 Withx 2 , the oval long axis length of its neutral surfaceD max ；Coordinate of the center of rotating shaft 3 in x/y plane is P（x 0 ,y 0 ）, the cone angle of sealing circular conical surface is 2； 
,
；
3）Numerical discretization processing
Using z as primary variables, by its domain of definition：Carry out equidistantly discrete；
4）Determine subregion
Assuming that have one parallel to x/y plane plane z=z0, z0For the centrifugal pump taken in step 3 to variable z；Two sections or one section of hyperbola are then intercepted on valve plate circular conical surface according to the plane, then in x/y plane, y domain of definition can be divided into two or a region；Specifically, when
When, plane z=z0Two sections of hyperbolas, i.e. y domain of definition are intercepted on valve plate circular conical surface and is divided into two intervals；When
When, plane z=z0It is only an interval that one section of hyperbola, i.e. y domain of definition are intercepted on valve plate circular conical surface；
；
5）Judge
Bring each z value of the interval interior discrete acquisition of z domain of definition into inequalityIt is middle once to be judged, wherein
；Inequality is set up and is then recorded as 1, is otherwise 0；According to record result, if all 1, dimensional interference will not occur completely, if being not all 1, corresponding to 0 z values be on sealing surface by generation dimensional interference region z coordinate value.
2. a kind of simple decision method of three-eccentric-butterfly-valve size of seal contact face interference as claimed in claim 1, it is characterised in that：It is described using z as primary variables, by its domain of definition：Progress is equidistantly discrete to be：Using z as primary variables, by its domain of definition：
Some deciles are divided into, and successively to variable z values；According to the symmetry of butterfly valve axially symmetric structure and coordinate system, can only it be investigated during practical operation
Interval, the result of rest interval can be obtained according to symmetry；For reduction trueness error caused by discrete processes as far as possible, interval is quantized after being at least divided into more than 100 grades point to variable z.
3. a kind of simple decision method of three-eccentric-butterfly-valve size of seal contact face interference as claimed in claim 2, it is characterised in that：The value of the variable z takes 0,
,
,
...,
。
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051295A (en) * | 2016-07-13 | 2016-10-26 | 王子文 | Design method for seal size of three-eccentric center butterfly valve |
| CN106958665A (en) * | 2017-05-22 | 2017-07-18 | 西华大学 | The method for designing of positive circular section three-eccentric-butterfly-valve |
| CN108489673A (en) * | 2018-04-28 | 2018-09-04 | 苏州纽威阀门股份有限公司 | A kind of measuring device of three-eccentric-butterfly-valve sealing surface and the measurement method of leakproofness |
| CN111536876A (en) * | 2020-06-02 | 2020-08-14 | 华东理工大学 | In-situ measurement method for sealing surface of three-eccentric center butterfly valve |
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| JPH0875014A (en) * | 1994-09-06 | 1996-03-19 | Sasakura Eng Co Ltd | Valve seat device in eccentric butterfly valve |
| CN2307960Y (en) * | 1997-07-28 | 1999-02-17 | 成都阀门厂 | Three-eccentric butterfly valve |
| CN1512093A (en) * | 2002-12-31 | 2004-07-14 | 丁庆新 | Optimization method for production parameter of three eccentric butterfly valve |
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| JPH0875014A (en) * | 1994-09-06 | 1996-03-19 | Sasakura Eng Co Ltd | Valve seat device in eccentric butterfly valve |
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| CN1512093A (en) * | 2002-12-31 | 2004-07-14 | 丁庆新 | Optimization method for production parameter of three eccentric butterfly valve |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051295A (en) * | 2016-07-13 | 2016-10-26 | 王子文 | Design method for seal size of three-eccentric center butterfly valve |
| CN106958665A (en) * | 2017-05-22 | 2017-07-18 | 西华大学 | The method for designing of positive circular section three-eccentric-butterfly-valve |
| CN108489673A (en) * | 2018-04-28 | 2018-09-04 | 苏州纽威阀门股份有限公司 | A kind of measuring device of three-eccentric-butterfly-valve sealing surface and the measurement method of leakproofness |
| CN108489673B (en) * | 2018-04-28 | 2023-11-03 | 苏州纽威阀门股份有限公司 | Measuring device for sealing surface of three-eccentric butterfly valve and measuring method for tightness |
| CN111536876A (en) * | 2020-06-02 | 2020-08-14 | 华东理工大学 | In-situ measurement method for sealing surface of three-eccentric center butterfly valve |
| CN111536876B (en) * | 2020-06-02 | 2021-07-13 | 华东理工大学 | In-situ measurement method for sealing surface of three-eccentric center butterfly valve |
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| CN102537382B (en) | 2014-04-09 |
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