CN107725790A - A kind of computational methods for being catalyzed flue gas and butterfly valve and its sealing ring sealing curved surface being cut off with high temperature - Google Patents
A kind of computational methods for being catalyzed flue gas and butterfly valve and its sealing ring sealing curved surface being cut off with high temperature Download PDFInfo
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- CN107725790A CN107725790A CN201710922831.8A CN201710922831A CN107725790A CN 107725790 A CN107725790 A CN 107725790A CN 201710922831 A CN201710922831 A CN 201710922831A CN 107725790 A CN107725790 A CN 107725790A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—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 with pivoted closure-members
- F16K1/18—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 with pivoted closure-members with pivoted discs or flaps
- F16K1/22—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 with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—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 with pivoted closure-members
- F16K1/18—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 with pivoted closure-members with pivoted discs or flaps
- F16K1/22—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 with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/224—Details of bearings for the axis of rotation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—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 with pivoted closure-members
- F16K1/18—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 with pivoted closure-members with pivoted discs or flaps
- F16K1/22—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 with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2261—Shaping or arrangements of the sealing the sealing being arranged on the valve member
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
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- Geometry (AREA)
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- Pure & Applied Mathematics (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Lift Valve (AREA)
Abstract
Butterfly valve is cut off with high temperature the invention discloses one kind catalysis flue gas, it includes valve body（1）, valve plate（2）And valve shaft（3）, valve body（1）Inside it is provided with medium runner（4）, stepped hole（6）Inside it is provided with shaft supporting structure, axle locating ring（10）It is fixed on stepped hole（6）Aperture in, locating ring（10）One end stretch into medium runner（4）It is interior, bearing outer ring（8）It is arranged at stepped hole（6）Macropore in, bearing outer ring（8）Inside offer spherical groove（13）, bearing outer ring（8）Inside being provided with can be around spherical groove（13）The bearing inner race of axis rotation（7）, bearing inner race（7）Middle part is installed with through bearing inner race（7）Mounting hole（14）.The beneficial effects of the invention are as follows：It is compact-sized, reliable, sealing is tight, service life length.
Description
Technical field
The present invention relates to the technical field of cut-out butterfly valve structure, particularly a kind of catalysis flue gas with high temperature cut off butterfly valve and its
Sealing ring seals the computational methods of curved surface.
Background technology
Being presently used for the butterfly valve of cut-out mainly has single eccentric, double eccentric and three eccentricity structure butterfly valve, and can realize gold
Belong to and only have three eccentricity structure to the structure of metal featuring rigid cutting-off.Because the existing metallic seal butterfly valve applied to worst hot case exists
Sealing, dexterity of action etc. existing defects, therefore almost not using butterfly valve as featuring rigid cutting-off under worst hot case
Form, but due to the maximization of modern industry device, a kind of compact-sized, in light weight heavy-caliber high-temperature stop valve in need
Door.Existing butterfly valve in shafting due to being supported, sealing pair, system rigidity etc. have not been combined with valve high-temperature operation operating mode
Come, therefore do not adapt to operation requirement during higher than 400 DEG C.Since because the medium temperature of circulation is higher, meeting after valve shaft is heated
In axial direction extending, drive the valve plate being mounted thereon to move, the sealing ring ultimately resulted on valve plate closely contacts with valve seat,
Lead to not Open valve, in addition, after sealing ring long term wear, sealing ring gap occurs with valve seat causes poorly sealed close, drop
The service life of low valve.And because circulation medium pressure is higher, valve shaft is badly deformed, the axle journal at valve shaft both ends is stuck in
In bearing, there is stuck phenomenon, therefore existing cut-out butterfly valve can not apply operation requirement when higher than 400 DEG C.
The content of the invention
The shortcomings that it is an object of the invention to overcome prior art, there is provided a kind of rational in infrastructure, reliable, sealing is sternly
Close, service life length catalysis flue gas cuts off butterfly valve with high temperature and its sealing ring seals the computational methods of curved surface.
The purpose of the present invention is achieved through the following technical solutions：One kind catalysis flue gas cuts off butterfly valve with high temperature, and it includes
Valve body, valve plate and valve shaft, medium runner is provided with described valve body, conical valve seat is provided with medium runner, it is described
Stepped hole is offered on valve body and positioned at the left and right sides of medium runner, shaft supporting structure, axle support knot are provided with stepped hole
Structure includes bearing inner race, bearing outer ring, locating ring, lubricating ester adding set and blow device, locating ring and is fixed on stepped hole
In aperture, one end of locating ring is stretched into medium runner, and bearing outer ring is arranged in the macropore of stepped hole, is opened up in bearing outer ring
There is spherical groove, the bearing inner race that can be rotated around spherical groove axis is provided with bearing outer ring, is installed with and passes through in the middle part of bearing inner race
Wear the mounting hole of bearing inner race, mounting hole connects with locating ring, be additionally provided with described bearing outer ring inert gas entrance and
The lubricating ester groove of spherical groove is connected, is connected with lubricating ester adding set at lubricating ester groove, inert gas entrance connects with locating ring
And blow device is connected with inert gas entrance, the axle journal of described valve shaft left and right ends is respectively arranged in two axle supports
Axially disposed flat key is installed in the mounting hole of structure, on valve shaft, chute is offered in described valve plate, valve plate is through cunning
Groove is engaged with flat key and is slidably mounted on valve shaft, and the left and right end portions of valve plate press between two locating rings respectively, valve plate
The sealing ring coordinated with conical valve seat is installed on outer ring.
Two described shaft supporting structures are symmetrical arranged.
Described inert gas entrance is between locating ring and lubricating ester groove.
The computational methods of the sealing ring sealing curved surface of described high temperature cut-out butterfly valve, it comprises the following steps：
S1, entrance angle calculating, its specific calculation procedure are：Extend conical valve seat, with O1For conical point, with O2For valve
The axis of axle；If the point of contact of sealing ring and conical valve seat upper end is A, sealing ring and the point of contact of conical valve seat bottom are B；Build
Vertical entrance angle calculates figure；The entrance angle that A points are calculated by the entrance angle calculating figure established isB
Point entrance angle beUnder normal temperature operating mode：A1 ≈ a2 >=1~2 °+tan-1f；Under worst hot case：a1
≈ a2 >=7~8 °+tan-1F, wherein b are O2To the horizontal range of sealing ring, h O2To the vertical distance of A points, n O2To B points
Vertical distance, q O1O2With O1Angle between A, r O1O2Angle between horizontal plane, f be conical valve seat sealing surface with
Coefficient of friction between sealing ring sealing surfaces, (tan-1F) it is angle of friction；
S2, sealing ring high-order sealing curve calculating, its specific calculation procedure are：
S2 (I), the entrance angle extended at A and B points, intersection be O points, X-axis for ∠ AOB angular bisector, Y-axis perpendicular to
X-axis；
S2 (II), according to parabolical definition, point on parabola to the distance of focus is equal to the point to the distance of directrix,
If focus is F (x0,y0), directrix equation l：Y=k0x+b0, then parabolic equation be：
Therefore, as long as solving four unknown number x0,y0,k0,b0, you can this any parabola is tried to achieve,
S2 (III), the coordinate for setting point of penetration A and B point are respectively A (x1,y1)、B(x2,y2),
By A (x1,y1) substitute into (1) formula obtain：
By B (x2,y2) substitute into (1) formula obtain：
S2 (IV) is due to two tangent lines that OA and OB was O points, then OA and OB slope opposite number, therefore OA's is oblique each other
Rate isFormula (1) formula is obtained to x derivations：
By A (x1,y1) andSubstitution formula formula (4)：
By B (x2,y2) andFormula (4) is substituted into obtain：
Simultaneous formula formula (2), (3), (5), (6) can try to achieve parabolic equation, as sealing ring high-order sealing curve；
S3, time that curve is rotated by 360 ° to obtain as bus around the axis of symmetry of curve is sealed using the high-order in step S2
Swivel, and obtain the sealing curved surface of sealing ring by the part beyond the excision border of border of two points of penetration of AB.
The present invention has advantages below：
(1) sealing entrance angle is the key that valve seal pair is not stuck, and is coordinated by bias and optimized, and is obtained rational close
Entrance angle, while the sealing ring sealing curved design of high-order are sealed, sealing entrance angle is not also become after sealing wear
Change, maintain permanent sealing dexterity of action, while ensure that the sealing tightness of valve.
(3) this invention removes cause sealing ring can not be pinpoint existing with conical valve seat because valve shaft expands with heat and contract with cold
As, therefore ensure that the reliability in the reliability and action of high and low temperature state lower seal and conical valve seat sealing.
(4) cooperation of the bearing inner race and bearing outer ring of flexural buckling is adapted to, valve shaft is in the dual work of high-temperature high-pressure medium
During with lower stand under load elastic bending, because valve shaft and bearing inner race have same flexure angle, it ensure that valve shaft still can be free
Flexible rotating.
(5) present invention has medium purging function, prevents the located ring of media particle from entering in bearing, avoids and be situated between
The phenomenon of the stuck bearing of matter particle.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is Fig. 1 A-A sectional views；
Fig. 3 is Fig. 2 I portions partial enlarged view
Fig. 4 is the structural representation of shaft supporting structure；
Fig. 5 is that entrance angle calculates figure；
Fig. 6 is the calculating figure that sealing ring high-order seals curve；
In figure, 1- valve bodies, 2- valve plates, 3- valve shafts, 4- medium runners, 5- conical valve seats, 6- stepped holes, in 7- bearings
Circle, 8- bearing outer rings, 10- locating rings, 11- lubricating ester adding sets, 12- blow devices, 13- spherical grooves, 14- mounting holes, 15-
Inert gas entrance, 16- lubricating ester grooves, 17- flat keys, 18- chutes, 19- sealing rings.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings, and protection scope of the present invention is not limited to as described below：
As shown in figures 1-4, a kind of catalysis flue gas cuts off butterfly valve with high temperature, and it includes valve body 1, valve plate 2 and valve shaft 3, institute
Medium runner 4 is provided with the valve body 1 stated, is provided with conical valve seat 5 in medium runner 4, on described valve body 1 and is located at medium
The left and right sides of runner 4 offers stepped hole 6, and shaft supporting structure is provided with stepped hole 6, and two shaft supporting structures are symmetrically set
Put, shaft supporting structure includes bearing inner race 7, bearing outer ring 8, locating ring 10, lubricating ester adding set 11 and blow device 12, fixed
Position ring 10 is fixed in the aperture of stepped hole 6, and one end of locating ring 10 is stretched into medium runner 4, and bearing outer ring 8 is arranged at step
In the macropore in hole 6, spherical groove 13 is offered in bearing outer ring 8, is provided with what can be rotated around the axis of spherical groove 13 in bearing outer ring 8
Bearing inner race 7, the i.e. spheroid of the outside of bearing inner race 7 are engaged with the spherical groove 13 of bearing outer ring 8, and bearing inner race 7 can be in axle
Bearing outer-ring 8 does freely rotating for any direction, and the middle part of bearing inner race 7 is installed with the mounting hole 14 through bearing inner race 7, installation
Hole 14 connects with locating ring 10.Due to freely coordinating for bearing inner race 7 and bearing outer ring 8, valve shaft 3 is in high-temperature high-pressure medium pair
When recast is with lower stand under load elastic bending, because valve shaft 3 and bearing inner race 7 have same flexure angle, valve shaft 3 ensure that still
Energy freedom and flexibility rotate, and avoid valve shaft from forming interference fit with mounting hole and can not rotate.
Inert gas entrance 15 is additionally provided with described bearing outer ring 8 and connects the lubricating ester groove 16 of spherical groove 13, it is lazy
Property gas access 15 between locating ring 10 and lubricating ester groove 16, lubricating ester groove 16 is ring-shaped, at lubricating ester groove 16 connect
There is a lubricating ester adding set 11, therefore can be by lubricating lubricating ester adding set 11 through lubricating ester groove 16 to bearing inner race 7 and axle
The contact surface of bearing outer-ring 8 periodically adds note ester lubrication, ensures the good lubrication of bearing.Inert gas entrance 15 connects with locating ring 10
And blow device 12 is connected with inert gas entrance 15, the axle journal of the described left and right ends of valve shaft 3 is respectively arranged in two
In the mounting hole 14 of shaft supporting structure, axially disposed flat key 17 is installed on valve shaft 3, offered in described valve plate 2
Chute 18, valve plate 2 are engaged with flat key 17 through chute 18 and are slidably mounted on valve shaft 3, and the left and right end portions of valve plate 2 compress respectively
Between two locating rings 10, the sealing ring 19 coordinated with conical valve seat 5 is installed on the outer ring of valve plate 2.
The course of work of the present invention is as follows：When medium to be turned on, rotating valve axle 3, due to valve plate 2 and valve shaft 3 it
Between be connected with flat key 17, flat key 17 transmits torque to valve plate 2, and the sealing ring 19 on valve plate 2 is separated with conical valve seat, and medium is led
Logical, after the high-temperature medium of circulation communicates the temperature to valve shaft 3, valve shaft 3 extends to both ends, because the position of valve plate 2 is
Limited by two locating rings 10, now valve shaft 3 can only be moved without driving valve plate 2 to move by flat key 17 along chute 18,
So as to effectively eliminate valve shaft expand with heat and contract with cold cause sealing ring 19 and conical valve seat 5 can not pinpoint phenomenon, avoid
Sealing ring 19 it is stuck on conical valve seat 5 and can not on and off medium, ensure that high and low temperature state lower seal with cone
The reliability of shape valve base sealing and the reliability of action；When valve working, blow device 12 is through inert gas entrance 15 to calmly
Inert media is blown into the ring 10 of position will not pollute flue gas medium, and inert media is blown out close to shaft end, the particulate matter of locating ring 10
Medium, bearing is prevented to be stuck.
The computational methods of the sealing ring sealing curved surface of described high temperature cut-out butterfly valve, it comprises the following steps：
S1, entrance angle calculating, its specific calculation procedure are：Extend conical valve seat 5, with O1For conical point, with O2For valve
The axis of axle 3；If sealing ring 19 and the point of contact of the upper end of conical valve seat 5 are A, sealing ring 19 is cut with the bottom of conical valve seat 5
Point is B；Entrance angle calculating figure is established, as shown in figure 5, wherein dotted line is the extended line of conical valve seat 5；Pass through the incision established
The entrance angle that angle calculating figure calculates A points isThe entrance angle of B points is
Under normal temperature operating mode：A1 ≈ a2 >=1~2 °+tan-1f；Under worst hot case：A1 ≈ a2 >=7~8 °+tan-1F, wherein b are O2To close
The horizontal range of seal 19, h O2To the vertical distance of A points, n O2To the vertical distance of B points, q O1O2With O1Folder between A
Angle, r O1O2Angle between horizontal plane, coefficient of friction of the f between conical valve seat sealing surface and sealing ring sealing surfaces,
(tan-1F) it is angle of friction；
S2, as shown in fig. 6, the calculating of sealing ring high-order sealing curve, its specific calculation procedure is：
S2I, the entrance angle extended at A and B points, intersection are O points, and X-axis is ∠ AOB angular bisector, and Y-axis is perpendicular to X
Axle；S2II, according to parabolical definition, the point on parabola is equal to the point to the distance of directrix to the distance of focus, if focus
For F (x0,y0), directrix equation l：Y=k0x+b0, then parabolic equation be：
Therefore, as long as solving four unknown number x0,y0,k0,b0, you can this any parabola is tried to achieve,
S2III, the coordinate for setting point of penetration A and B point are respectively A (x1,y1)、B(x2,y2),
By A (x1,y1) substitute into 1 formula obtain：
By B (x2,y2) substitute into 1 formula obtain：
S2IV is due to two tangent lines that OA and OB was O points, then OA and OB slope opposite number, therefore OA slope each other
ForThe formula of formula 1 is obtained to x derivations：
By A (x1,y1) andSubstitution formula formula 4：
By B (x2,y2) andFormula 4 is substituted into obtain：
Simultaneous formula formula 2,3,5,6 can try to achieve parabolic equation, as sealing ring high-order sealing curve；
S3, time that curve is rotated by 360 ° to obtain as bus around the axis of symmetry of curve is sealed using the high-order in step S2
Swivel, and the sealing curved surface of sealing ring is obtained by the part beyond the excision border of border of two points of penetration of AB, it ensure that close
Envelope entrance angle will not also change after long term seal abrasion, maintain permanent sealing dexterity of action, ensure that simultaneously
Valve seal pair is not stuck, and extends the service life of valve.
Claims (4)
1. one kind catalysis flue gas cuts off butterfly valve with high temperature, it is characterised in that：It includes valve body (1), valve plate (2) and valve shaft (3),
Medium runner (4) is provided with described valve body (1), conical valve seat (5), described valve body (1) are provided with medium runner (4)
Upper and positioned at medium runner (4) left and right sides offers stepped hole (6), and shaft supporting structure, axle branch are provided with stepped hole (6)
Support structure includes bearing inner race (7), bearing outer ring (8), locating ring (10), lubricating ester adding set (11) and blow device
(12), locating ring (10) is fixed in the aperture of stepped hole (6), and one end of locating ring (10) is stretched into medium runner (4), bearing
Outer ring (8) is arranged in the macropore of stepped hole (6), and spherical groove (13) is offered in bearing outer ring (8), is set in bearing outer ring (8)
The bearing inner race (7) that can be rotated around spherical groove (13) axis is equipped with, is installed with the middle part of bearing inner race (7) through bearing inner race
(7) mounting hole (14), mounting hole (14) connect with locating ring (10), and described bearing outer ring is additionally provided with indifferent gas on (8)
Body entrance (15) and the lubricating ester groove (16) for connecting spherical groove (13), lubricating ester groove (16) place are connected with lubricating ester adding set
(11), inert gas entrance (15) connects with locating ring (10) and inert gas entrance (15) place is connected with blow device (12),
The axle journal of described valve shaft (3) left and right ends is respectively arranged in the mounting hole (14) of two shaft supporting structures, valve shaft (3)
On axially disposed flat key (17) is installed, offers chute (18) in described valve plate (2), valve plate (2) is through chute (18)
It is engaged and is slidably mounted on valve shaft (3) with flat key (17), the left and right end portions of valve plate (2) presses on two locating rings respectively
(10) between, the sealing ring (19) coordinated with conical valve seat (5) is installed on valve plate (2) outer ring.
2. a kind of catalysis flue gas according to claim 1 cuts off butterfly valve with high temperature, it is characterised in that：Two described axle branch
Support structure is symmetrical arranged.
3. a kind of catalysis flue gas according to claim 1 cuts off butterfly valve with high temperature, it is characterised in that：Described inert gas
Entrance (15) is located between locating ring (10) and lubricating ester groove (16).
4. the computational methods of the sealing ring sealing curved surface of the high temperature cut-out butterfly valve according to any one in claims 1 to 3,
It is characterized in that：It comprises the following steps：
S1, entrance angle calculating, its specific calculation procedure are：Extend conical valve seat (5), with O1For conical point, with O2For valve shaft
(3) axis；If the point of contact of sealing ring (19) and conical valve seat (5) upper end is A, under sealing ring (19) and conical valve seat (5)
The point of contact of end is B；Establish entrance angle calculating figure；The entrance angle that A points are calculated by the entrance angle calculating figure established isThe entrance angle of B points isUnder normal temperature operating mode：A1 ≈ a2 >=1~2 °+tan-1f；Under worst hot case：A1 ≈ a2 >=7~8 °+tan-1F, wherein b are O2To the horizontal range of sealing ring (19), h O2To A
The vertical distance of point, n O2To the vertical distance of B points, q O1O2With O1Angle between A, r O1O2Between horizontal plane
Angle, coefficient of friction of the f between conical valve seat sealing surface and sealing ring sealing surfaces, (tan-1F) it is angle of friction；
S2, sealing ring high-order sealing curve calculating, its specific calculation procedure are：
S2 (I), the entrance angle extended at A and B points, intersection are O points, and X-axis is ∠ AOB angular bisector, and Y-axis is perpendicular to X-axis；
S2 (II), according to parabolical definition, the point on parabola is equal to the point to the distance of directrix to the distance of focus, if burnt
Point is F (x0,y0), directrix equation l：Y=k0x+b0, then parabolic equation be：
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S2 (III), the coordinate for setting point of penetration A and B point are respectively A (x1,y1)、B(x2,y2),
By A (x1,y1) substitute into (1) formula obtain：
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</msup>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>y</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<msub>
<mi>y</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>=</mo>
<mfrac>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>k</mi>
<mn>0</mn>
</msub>
<msub>
<mi>x</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<msub>
<mi>y</mi>
<mn>2</mn>
</msub>
<mo>+</mo>
<msub>
<mi>b</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mrow>
<msubsup>
<mi>k</mi>
<mn>0</mn>
<mn>2</mn>
</msubsup>
<mo>+</mo>
<mn>1</mn>
</mrow>
</mfrac>
<mo>...</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
S2 (IV) is due to two tangent lines that OA and OB was O points, then OA and OB slope opposite number, therefore OA slope is each otherFormula (1) formula is obtained to x derivations：
<mrow>
<mn>2</mn>
<mrow>
<mo>(</mo>
<mi>x</mi>
<mo>-</mo>
<msub>
<mi>x</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>2</mn>
<mrow>
<mo>(</mo>
<mi>y</mi>
<mo>-</mo>
<msub>
<mi>y</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<msup>
<mi>y</mi>
<mo>&prime;</mo>
</msup>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2</mn>
<mrow>
<mo>(</mo>
<msub>
<mi>k</mi>
<mn>0</mn>
</msub>
<mi>x</mi>
<mo>-</mo>
<mi>y</mi>
<mo>+</mo>
<msub>
<mi>b</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msubsup>
<mi>k</mi>
<mn>0</mn>
<mn>2</mn>
</msubsup>
<mo>+</mo>
<mn>1</mn>
</mrow>
</mfrac>
<mo>(</mo>
<mrow>
<msub>
<mi>k</mi>
<mn>0</mn>
</msub>
<mo>-</mo>
<msup>
<mi>y</mi>
<mo>&prime;</mo>
</msup>
</mrow>
<mo>)</mo>
<mo>...</mo>
<mrow>
<mo>(</mo>
<mn>4</mn>
<mo>)</mo>
</mrow>
</mrow>
By A (x1,y1) andSubstitution formula formula (4)：
<mrow>
<mn>2</mn>
<mrow>
<mo>(</mo>
<msub>
<mi>x</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<msub>
<mi>x</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>2</mn>
<mrow>
<mo>(</mo>
<msub>
<mi>y</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<msub>
<mi>y</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mfrac>
<msub>
<mi>y</mi>
<mn>1</mn>
</msub>
<msub>
<mi>x</mi>
<mn>1</mn>
</msub>
</mfrac>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2</mn>
<mrow>
<mo>(</mo>
<msub>
<mi>k</mi>
<mn>0</mn>
</msub>
<msub>
<mi>x</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<msub>
<mi>y</mi>
<mn>1</mn>
</msub>
<mo>+</mo>
<msub>
<mi>b</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msubsup>
<mi>k</mi>
<mn>0</mn>
<mn>2</mn>
</msubsup>
<mo>+</mo>
<mn>1</mn>
</mrow>
</mfrac>
<mo>(</mo>
<mrow>
<msub>
<mi>k</mi>
<mn>0</mn>
</msub>
<mo>-</mo>
<mfrac>
<msub>
<mi>y</mi>
<mn>1</mn>
</msub>
<msub>
<mi>x</mi>
<mn>1</mn>
</msub>
</mfrac>
</mrow>
<mo>)</mo>
<mo>...</mo>
<mo>(</mo>
<mn>5</mn>
<mo>)</mo>
</mrow>
By B (x2,y2) andFormula (4) is substituted into obtain：
<mrow>
<mn>2</mn>
<mrow>
<mo>(</mo>
<msub>
<mi>x</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<msub>
<mi>x</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mn>2</mn>
<mrow>
<mo>(</mo>
<msub>
<mi>y</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<msub>
<mi>y</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mfrac>
<msub>
<mi>y</mi>
<mn>1</mn>
</msub>
<msub>
<mi>x</mi>
<mn>1</mn>
</msub>
</mfrac>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2</mn>
<mrow>
<mo>(</mo>
<msub>
<mi>k</mi>
<mn>0</mn>
</msub>
<msub>
<mi>x</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<msub>
<mi>y</mi>
<mn>2</mn>
</msub>
<mo>+</mo>
<msub>
<mi>b</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msubsup>
<mi>k</mi>
<mn>0</mn>
<mn>2</mn>
</msubsup>
<mo>+</mo>
<mn>1</mn>
</mrow>
</mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>k</mi>
<mn>0</mn>
</msub>
<mo>+</mo>
<mfrac>
<msub>
<mi>y</mi>
<mn>1</mn>
</msub>
<msub>
<mi>x</mi>
<mn>1</mn>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
<mo>...</mo>
<mrow>
<mo>(</mo>
<mn>6</mn>
<mo>)</mo>
</mrow>
</mrow>
Simultaneous formula formula (2), (3), (5), (6) can try to achieve parabolic equation, as sealing ring high-order sealing curve；
S3, the revolving body for being rotated by 360 ° to obtain around the axis of symmetry of curve as bus using the high-order sealing curve in step S2,
And obtain the sealing curved surface of sealing ring by the part beyond the excision border of border of two points of penetration of AB.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109268513A (en) * | 2018-10-15 | 2019-01-25 | 兰州高压阀门有限公司 | A kind of design of air sealed valve |
| CN109667940A (en) * | 2018-11-21 | 2019-04-23 | 中国北方车辆研究所 | A kind of the butterfly valve valve block and design method of hydraulic retarder |
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|---|---|---|---|---|
| WO2000017550A1 (en) * | 1998-09-24 | 2000-03-30 | Jongchul Lee | Butterfly valve |
| CN201145061Y (en) * | 2008-01-25 | 2008-11-05 | 沈阳欧科流体控制技术有限公司 | Eccentric rotary valve with antilock device |
| CN202469059U (en) * | 2012-03-07 | 2012-10-03 | 成都华科阀门制造有限公司 | Rotary valve |
| CN202629104U (en) * | 2012-05-31 | 2012-12-26 | 无锡宝牛阀业有限公司 | High-temperature seal butterfly valve |
| CN203670784U (en) * | 2013-12-31 | 2014-06-25 | 山东晨钟机械股份有限公司 | Mounting error self-adaptation sealing device |
| CN204900865U (en) * | 2015-07-10 | 2015-12-23 | 成都华科阀门制造有限公司 | Butterfly vave of flue gas turbine |
-
2017
- 2017-09-30 CN CN201710922831.8A patent/CN107725790B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000017550A1 (en) * | 1998-09-24 | 2000-03-30 | Jongchul Lee | Butterfly valve |
| CN201145061Y (en) * | 2008-01-25 | 2008-11-05 | 沈阳欧科流体控制技术有限公司 | Eccentric rotary valve with antilock device |
| CN202469059U (en) * | 2012-03-07 | 2012-10-03 | 成都华科阀门制造有限公司 | Rotary valve |
| CN202629104U (en) * | 2012-05-31 | 2012-12-26 | 无锡宝牛阀业有限公司 | High-temperature seal butterfly valve |
| CN203670784U (en) * | 2013-12-31 | 2014-06-25 | 山东晨钟机械股份有限公司 | Mounting error self-adaptation sealing device |
| CN204900865U (en) * | 2015-07-10 | 2015-12-23 | 成都华科阀门制造有限公司 | Butterfly vave of flue gas turbine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109268513A (en) * | 2018-10-15 | 2019-01-25 | 兰州高压阀门有限公司 | A kind of design of air sealed valve |
| CN109667940A (en) * | 2018-11-21 | 2019-04-23 | 中国北方车辆研究所 | A kind of the butterfly valve valve block and design method of hydraulic retarder |
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|---|---|
| CN107725790B (en) | 2019-05-17 |
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