CN104482233A - Profile design method of valve plug of conical throttle valve with controlled pressure differential characteristics - Google Patents
Profile design method of valve plug of conical throttle valve with controlled pressure differential characteristics Download PDFInfo
- Publication number
- CN104482233A CN104482233A CN201410641760.0A CN201410641760A CN104482233A CN 104482233 A CN104482233 A CN 104482233A CN 201410641760 A CN201410641760 A CN 201410641760A CN 104482233 A CN104482233 A CN 104482233A
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- CN
- China
- Prior art keywords
- throttle valve
- spool
- differential pressure
- throat area
- pressure characteristics
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Classifications
-
- 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
- F16K1/38—Valve members of conical shape
-
- 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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding Valves (AREA)
Abstract
The invention relates to a profile design method of a valve plug of a conical throttle valve with controlled pressure differential characteristics. The profile design method achieves profile design of the valve plug of the throttle valve by controlling the area of a throat of the conical throttle valve, and aims to improve the control capability of profile design of the valve plug of the conical throttle valve in incompressible flow on the pressure differential characteristics of the throttle valve. The profile design method achieves profile design of the valve plug by building the mathematical relational expressions of the relative displacement amount of the conical throttle valve pressure differential in incompressible flow, the area of the throat of the throttle valve, the valve plug of the throttle valve and a casing and controlling the area of the throat at different valve plug positions according to the requirements of the conical throttle valve pressure differential, avoids the repeated circulative iteration process of the traditional design method, can greatly improve the efficiency of profile design of the conical throttle valve, and is applicable to the profile design of the valve plug of the conical throttle valve of the incompressible flow field.
Description
Technical field
The present invention relates to the conical wing valve design field in Flows, is a kind of method can carrying out the moulding of conical wing valve spool according to throttle valve differential pressure characteristics demand, a kind of conical wing valve controlled differential pressure characteristics spool figure design method specifically.
Background technique
In Flows, the use of conical wing valve is very common, is not only widely used in field of industrial production, is also widely applied in all kinds of fluid test device.The cross section differential static pressure Changing Pattern with throttle valve opening imported and exported by throttle valve, also the differential pressure characteristics of i.e. throttle valve, mainly contains linear differential pressure characteristics, equal percentage differential pressure characteristics, parabola differential pressure characteristics and opens differential pressure characteristics etc. four kinds soon.Throttle valve under four kinds of differential pressure characteristics correspondences, there is significantly difference in its throttling rule with aperture change, can meet the throttling rule demand of different application occasion.And the differential pressure characteristics of throttle valve is as its inherent characteristic, depend on the spool shape of throttle valve.For this reason, how according to the differential pressure characteristics demand of throttle valve, designing rational spool shape becomes important step in throttle valve design.But, existing conical wing valve spool figure design method, adopt the loop iteration mode that preliminary moulding, differential pressure characteristics accounting, moulding are optimized, cannot directly introduce throttle valve differential pressure characteristics to the impact of spool figure in design link, limit the efficiency of conical wing valve spool figure design to a great extent.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of conical wing valve spool figure design method efficiently, this spool figure design method directly introduces throttle valve differential pressure characteristics to the impact of spool figure in design link, by setting up throttle valve pressure reduction, throttle valve throat area, relationship between throttle valve core and housing relative displacement, realize the differential pressure characteristics that a spool figure moulding can meet throttle valve, avoid the process of iterative cycles iteration in traditional design method.Therefore, this design method significantly can promote the efficiency of conical wing valve spool figure design.
For realizing above technical purpose, throttle valve core method for designing profile of the present invention is carried out by the following technical programs: a kind of conical wing valve controlled differential pressure characteristics spool figure design method, described conical wing valve comprises housing and spool, the profile of described spool and the internal face of housing are turning surface, it is characterized in that, described spool figure design method comprises the steps:
SS1. according to designing requirement determination throttle valve differential pressure characteristics, described throttle valve differential pressure characteristics is linear differential pressure characteristics, equal percentage differential pressure characteristics, parabola differential pressure characteristics or open differential pressure characteristics soon;
SS2. setting up can not baric flow dynamic middle conical wing valve pressure differential deltap P, throttle valve throat area A
t, relationship between throttle valve core and housing relative shift L;
SS3. the throat area A under different valve element position is determined according to throttle valve differential pressure characteristics and described relationship
t;
SS4. under different valve element position around throat area turning surface such as the axis structures of throttle valve core, at the throat area set of curves such as bus formation of throttle valve same longitudinal section inner spool and the inferior throat area turning surface of each relative displacement of housing, described wait arbitrary latitude circle of throat area turning surface circulation area round-formed with throttle valve inner walls face aditus laryngis latitude to equal this position under throttle valve throat area A
t;
SS5. to wait internal tangent of throat area set of curves to be formed the turning surface bus of throttle valve core within the scope of throttle valve core total travel, the design of throttle valve core profile is completed thus.
Wherein, describedly can not move flowing into working fluid Mach number Ma≤0.3 by baric flow, described throttle valve pressure reduction is the difference of entrance section working fluid average static pressure and outlet working fluid average static pressure, described entrance section is positioned at throttle valve aditus laryngis latitude circle aditus laryngis latitude circle radius place, 3 ~ 5 times, upstream, described outlet is positioned at throttle valve aditus laryngis latitude circle aditus laryngis latitude circle radius place, 5 ~ 10 times, downstream, described throttle valve gullet section is the cross section that in throttle valve fluid passage, circulation area is minimum, the aditus laryngis latitude circle of described throttle valve gullet section all by throttle valve inner walls face within the scope of spool total travel, same latitude circle on the throttle valve inner walls face that described aditus laryngis latitude circle passes through for each gullet section within the scope of throttle valve core total travel.
Spool figure design method of the present invention can meet linearly, equal percentage, parabola and to open soon etc. four kinds of differential pressure characteristics require under conical wing valve spool figure design.
The internal flow of described conical wing valve is can not moving by baric flow of Mach number Ma≤0.3.
The spool figure of described conical wing valve is turning surface, and the inner walls face of described conical wing valve is turning surface.
Described throttle valve gullet section within the scope of spool total travel all by the aditus laryngis latitude in throttle valve inner walls face circle, the same latitude circle on the throttle valve inner walls face that described aditus laryngis latitude circle passes through for each gullet section within the scope of throttle valve core total travel.
Spool figure design method of the present invention can not move middle conical wing valve pressure reduction, throttle valve throat area, relationship between throttle valve core and housing relative shift by baric flow by setting up, requirement according to throttle valve differential pressure characteristics controls the throat area under different valve element position, realizes the design to throttle valve core profile.
In described spool figure design, throttle valve pressure differential deltap P and throat area A
tmeet Δ P=ρ v
out 2(A
out/ A
t-1) relationship, wherein ρ is working fluid density, v in throttle valve
outfor throttle valve outlet working fluid mean velocity, A
outfor throttle valve exit area.
In described spool figure design, equal percentage differential pressure characteristics throttle valve throat area A
t, spool and housing relative shift L meet A
t=A
out/ (e
aL+b+ 1) relationship, wherein e is the nature truth of a matter; A, b are constant, are determined by the magnitude of pressure differential under throttle valve core and maximum, the minimum relative displacement of housing.
In described spool figure design, linear differential pressure characteristics/parabola differential pressure characteristics/open differential pressure characteristics throttle valve throat area A soon
t, spool and housing relative shift L meet
wherein n is characteristic coefficient, and n=0 is linear differential pressure characteristics, and n=1/2 is parabola differential pressure characteristics, and n=-1 is for open differential pressure characteristics soon; A, b are constant, are determined by the magnitude of pressure differential under throttle valve core and maximum, the minimum relative displacement of housing.
In described spool figure design, under throttle valve core and housing relative displacement L, around the throat area turning surface such as axis structure of throttle valve core, described arbitrary latitude circle of throat area turning surface circulation area round-formed with throttle valve inner walls face aditus laryngis latitude that wait equals throat area A
t, at the throat area set of curves such as bus formation of throttle valve same longitudinal section inner spool and the inferior throat area turning surface of each relative displacement of housing.
In described spool figure design, throttle valve core profile is turning surface, and the bus of turning surface is the internal tangent waiting throat area set of curves within the scope of throttle valve core total travel.
Conical wing valve of the present invention controlled differential pressure characteristics spool figure design method comparatively has following beneficial effect compared with the existing methods: in the design of conical wing valve spool figure, by setting up throttle valve pressure reduction, throttle valve throat area, relationship between throttle valve core and housing relative displacement, the throat area under different valve element position is controlled according to throttle valve differential pressure characteristics, and then complete throttle valve core quasi spline, to realize the requirement that a spool figure moulding can meet throttle valve differential pressure characteristics, avoid the process of iterative cycles iteration in traditional design method, significantly can promote the efficiency of conical wing valve spool figure design.
Accompanying drawing explanation
Fig. 1 is conical wing valve three-dimensional longitudinal section diagram;
Fig. 2 is conical wing valve two dimension longitudinal section diagram;
Fig. 3 is dimensional parameters schematic diagram in spool figure design method of the present invention;
Fig. 4 is spool figure moulding schematic diagram in spool figure design method of the present invention;
Embodiment
For making technical purpose of the present invention, technological scheme and technological merit distincter, with reference to the accompanying drawings and enumerate examples of implementation, the present invention is described in more detail.
Fig. 1, Fig. 2 are respectively typical conical wing valve three-dimensional sectional arrangement drawing, a two-dimentional sectional arrangement drawing.This conical wing valve forms axisymmetric fluid passage by spool 1 and housing 2, and wherein spool figure 11 is turning surface, and inner walls face 21 is also turning surface.Spool 1 can move along the direction shown in double-head arrow in Fig. 1, and in spool 1 moving process, a certain latitude circle on spool figure 11 forms the minimum gullet section of circulation area 3 (as shown in Figure 2) with the fixing latitude circle on inner walls face 21.This gullet section 3 all by the same latitude circle in throttle valve inner walls face, is also the throttle valve inner walls face aditus laryngis latitude circle 22 shown in Fig. 1 within the scope of spool 1 total travel.
Fig. 3 is the dimensional parameters schematic diagram in described throttle valve core method for designing profile, import cross section 4 is positioned at aditus laryngis latitude circle aditus laryngis latitude circle radius r place, 5 times, 22 upstream, throttle valve inner walls face, and outlet 5 is positioned at aditus laryngis latitude circle aditus laryngis latitude circle radius r place, 10 times, 22 downstream, throttle valve inner walls face.Described throttle valve pressure differential deltap P is the differential static pressure of import cross section 4 and outlet 5, in described spool figure design method, and throttle valve pressure differential deltap P and throat area A
tmeet Δ P=ρ v
out 2(A
out/ A
t-1) relationship, wherein ρ is working fluid density, v in throttle valve
outfor throttle valve outlet 5 working fluid mean velocity, A
outfor the area of throttle valve outlet 5.
As a kind of mode of execution, such as choosing throttle valve differential pressure characteristics is equal percentage characteristics.In described spool figure design method, throttle valve throat area A
t, spool 1 meets A with housing 2 relative shift L
t=A
out/ (e
aL+b+ 1) relationship, wherein e is the nature truth of a matter; A, b are constant, determined, be respectively-0.017,3.525 by throttle valve core 1 and the magnitude of pressure differential under maximum, the minimum relative displacement of housing 2; A
outfor throttle valve exit area, size is 0.503m
2.
Fig. 4 is spool figure moulding schematic diagram in described design method, obtains the throat area A of different relative displacement L
tafter, for throttle valve core and a certain relative position l of housing
n, wait throat area turning surface around the axis AX structure of throttle valve core, described arbitrary latitude circle of throat area turning surface circulation area round-formed with throttle valve inner walls face aditus laryngis latitude that wait equals throat area A
tn, at throttle valve longitudinal section inner spool and each relative position l of housing
0, l
1, l
2l
nunder, respectively wait the throat area set of curves s such as the bus formation of throat area turning surface
0, s
1, s
2s
n.Preferably, described throttle valve core profile 11 is turning surface, and the bus of turning surface is wait throat area set of curves s within the scope of throttle valve core total travel
0, s
1, s
2s
ninternal tangent.
Numerical result shows, throttle valve pressure reduction relative variation (the Δ P that throttle valve core is caused by same displacement amount Δ l within the scope of total travel
n-Δ P
n-1)/Δ P
n-1be 0.75 ~ 0.78, maximum relative deviation is 3.8%.Numerical result shows, the throttle valve core profile designed makes described conical wing valve maintain good equal percentage differential pressure characteristics, consistent with the conical wing valve differential pressure characteristics required at the beginning of design.So, conical wing valve spool figure design method of the present invention, in a spool figure moulding, the differential pressure characteristics of throttle valve can be controlled preferably, avoid the design process of iterative cycles iteration, significantly can promote the efficiency of conical wing valve spool figure design.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of the present invention.
Claims (6)
1. a conical wing valve controlled differential pressure characteristics spool figure design method, described conical wing valve comprises housing and spool, the profile of described spool and the internal face of housing are turning surface, it is characterized in that, described spool figure design method comprises the steps:
SS1. according to designing requirement determination throttle valve differential pressure characteristics, described throttle valve differential pressure characteristics is linear differential pressure characteristics, equal percentage differential pressure characteristics, parabola differential pressure characteristics or open differential pressure characteristics soon;
SS2. setting up can not baric flow dynamic middle throttle valve pressure differential deltap P, throttle valve throat area A
t, relationship between throttle valve core and housing relative shift L;
SS3. the throttle valve throat area A under different valve element position is determined according to described throttle valve differential pressure characteristics and described relationship
t;
SS4. under different valve element position around throat area turning surface such as the axis structures of throttle valve core, at the throat area set of curves such as bus formation of throttle valve same longitudinal section inner spool and the inferior throat area turning surface of each relative displacement of housing, wherein, the circulation area that arbitrary latitude circle of described turning surface such as throat area such as grade is round-formed with throttle valve inner walls face aditus laryngis latitude equals the throttle valve throat area A under this position
t;
SS5. to wait internal tangent of throat area set of curves to be formed the turning surface bus of throttle valve core within the scope of throttle valve core total travel, the design of throttle valve core profile is completed thus.
Wherein, describedly can not move flowing into working fluid Mach number Ma≤0.3 by baric flow, described throttle valve pressure reduction is the difference of entrance section working fluid average static pressure and outlet working fluid average static pressure, described entrance section is positioned at throttle valve aditus laryngis latitude circle aditus laryngis latitude circle radius place, 3 ~ 5 times, upstream, described outlet is positioned at throttle valve aditus laryngis latitude circle aditus laryngis latitude circle radius place, 5 ~ 10 times, downstream, described throttle valve gullet section is the cross section that in throttle valve fluid passage, circulation area is minimum, the aditus laryngis latitude circle of described throttle valve gullet section all by throttle valve inner walls face within the scope of spool total travel, same latitude circle on the throttle valve inner walls face that described aditus laryngis latitude circle passes through for each gullet section within the scope of throttle valve core total travel.
2. spool figure design method according to claim 1, is characterized in that: in described spool figure design, throttle valve pressure differential deltap P and throat area A
tmeet Δ P=ρ v
out 2(A
out/ A
t-1) relationship, wherein ρ is working fluid density, v in throttle valve
outfor throttle valve outlet working fluid mean velocity, A
outfor throttle valve exit area.
3. the spool figure design method according to claim 1 and 2, is characterized in that: in described spool figure design, equal percentage differential pressure characteristics throttle valve throat area A
t, spool and housing relative shift L meet A
t=A
out/ (e
aL+b+ 1) relationship, wherein e is the nature truth of a matter; A, b are constant, are determined by the magnitude of pressure differential under throttle valve core and maximum, the minimum relative displacement of housing.
4. the spool figure design method according to claim 1 and 2, is characterized in that: in described spool figure design, linear differential pressure characteristics/parabola differential pressure characteristics/open differential pressure characteristics throttle valve throat area A soon
t, spool and housing relative shift L meet
wherein n is characteristic coefficient, and n=0 is linear differential pressure characteristics, and n=1/2 is parabola differential pressure characteristics, and n=-1 is for open differential pressure characteristics soon; A, b are constant, are determined by the magnitude of pressure differential under throttle valve core and maximum, the minimum relative displacement of housing.
5. the spool figure design method according to Claims 1-4, it is characterized in that: in described spool figure design, under throttle valve core and housing relative displacement L, around the throat area turning surface such as axis structure of throttle valve core, described arbitrary latitude circle of throat area turning surface circulation area round-formed with throttle valve inner walls face aditus laryngis latitude that wait equals throat area A
t, at the throat area set of curves such as bus formation of throttle valve same longitudinal section inner spool and the inferior throat area turning surface of each relative displacement of housing.
6. according to the spool figure design method described in claim 1 to 5, it is characterized in that: in described spool figure design, throttle valve core profile is turning surface, the bus of turning surface is the internal tangent waiting throat area set of curves within the scope of throttle valve core total travel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410641760.0A CN104482233B (en) | 2014-11-06 | 2014-11-06 | Profile design method of valve plug of conical throttle valve with controlled pressure differential characteristics |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410641760.0A CN104482233B (en) | 2014-11-06 | 2014-11-06 | Profile design method of valve plug of conical throttle valve with controlled pressure differential characteristics |
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| Publication Number | Publication Date |
|---|---|
| CN104482233A true CN104482233A (en) | 2015-04-01 |
| CN104482233B CN104482233B (en) | 2017-01-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089855A (en) * | 2016-06-13 | 2016-11-09 | 哈尔滨工业大学 | The hydraulic power optimization method of hydraulic valve |
| CN108240356A (en) * | 2018-01-08 | 2018-07-03 | 中国科学院工程热物理研究所 | A kind of Transonic Axial-flow Compressor casing circumferential slot unitized designing method |
| WO2022183566A1 (en) * | 2021-03-02 | 2022-09-09 | 中国石油大学(华东) | Method for designing valve port structure of oscillating shear valve of continuous wave generator, and oscillating shear valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2279131A (en) * | 1993-06-16 | 1994-12-21 | Seaboard Lloyd Ltd | Choke valve |
| CN2665481Y (en) * | 2003-07-22 | 2004-12-22 | 成都超宇自动化仪表有限责任公司 | Multi-stage throttle high pressure differential adjustable valve |
| CN201351763Y (en) * | 2009-02-23 | 2009-11-25 | 神华集团有限责任公司 | High pressure drop reducing valve |
| CN201377620Y (en) * | 2009-03-05 | 2010-01-06 | 无锡鹰贝精密轴承有限公司 | Valve core of U-shaped groove milled with plane |
| JP2013139882A (en) * | 2011-01-31 | 2013-07-18 | Saginomiya Seisakusho Inc | Throttle valve apparatus |
-
2014
- 2014-11-06 CN CN201410641760.0A patent/CN104482233B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2279131A (en) * | 1993-06-16 | 1994-12-21 | Seaboard Lloyd Ltd | Choke valve |
| CN2665481Y (en) * | 2003-07-22 | 2004-12-22 | 成都超宇自动化仪表有限责任公司 | Multi-stage throttle high pressure differential adjustable valve |
| CN201351763Y (en) * | 2009-02-23 | 2009-11-25 | 神华集团有限责任公司 | High pressure drop reducing valve |
| CN201377620Y (en) * | 2009-03-05 | 2010-01-06 | 无锡鹰贝精密轴承有限公司 | Valve core of U-shaped groove milled with plane |
| JP2013139882A (en) * | 2011-01-31 | 2013-07-18 | Saginomiya Seisakusho Inc | Throttle valve apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089855A (en) * | 2016-06-13 | 2016-11-09 | 哈尔滨工业大学 | The hydraulic power optimization method of hydraulic valve |
| CN108240356A (en) * | 2018-01-08 | 2018-07-03 | 中国科学院工程热物理研究所 | A kind of Transonic Axial-flow Compressor casing circumferential slot unitized designing method |
| CN108240356B (en) * | 2018-01-08 | 2019-06-18 | 中国科学院工程热物理研究所 | A kind of Transonic Axial-flow Compressor casing circumferential slot unitized designing method |
| WO2022183566A1 (en) * | 2021-03-02 | 2022-09-09 | 中国石油大学(华东) | Method for designing valve port structure of oscillating shear valve of continuous wave generator, and oscillating shear valve |
| US11886535B2 (en) | 2021-03-02 | 2024-01-30 | China University Of Petroleum (East China) | Oscillating shear valve of continuous pulse generator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104482233B (en) | 2017-01-11 |
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