CN100482986C - Three eccentric two-way self-tightening sealing rubber butterfly valve - Google Patents
Three eccentric two-way self-tightening sealing rubber butterfly valve Download PDFInfo
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- CN100482986C CN100482986C CNB2006100264471A CN200610026447A CN100482986C CN 100482986 C CN100482986 C CN 100482986C CN B2006100264471 A CNB2006100264471 A CN B2006100264471A CN 200610026447 A CN200610026447 A CN 200610026447A CN 100482986 C CN100482986 C CN 100482986C
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Abstract
The invention discloses a rubber sealed butterfly valve, it has combination deltoid rubber seal band whose section structure is designed and calculated according to the sealed principle, seal surface of valve body is thethree eccentricity slope-intercept seal surface with best contact deviate, so it is simply structured and good sealed, also it achieves 'two-way sealed'. Since the sealing force of self-tight sealed structure is much smaller and the medium force of the butterfly plate will not act on the sealed surface directly, friction torque of the sealed surface is really small, the life of the rubber sealed bank can be improved by more than two times, since size of section of rubber sealed band is small, we can save large quantity of rubber, and decrease the cost of production and material.
Description
Technical field
The present invention relates to a kind of valve, particularly be rubber seal butterfly valve technical field, the definite three eccentric two-way self-tightening sealing rubber butterfly valve of saying so.
Background technique
The rubber seal butterfly valve is low according to its manufacturing technology level simple in structure, in present general industry normal temperature low pressure line, still adopts in a large number in the urban water supply pipeline network construction especially.The sealing configuration of rubber seal butterfly valve mainly contains two kinds of forms at present.A kind of is axis symmetric form rubber seal butterfly valve, and this butterfly valve mainly relies on the interference fit of butterfly plate and rubber valve seat to form sealing force, and butterfly plate has determined the height of seal pressure to the size of rubber valve seat interference decrement.The interference decrement of general this butterfly valve is 1.4～2.2mm, the specific pressure that can form between 0.8～2Mpa.This valve in off position the time rubber valve seat be among the interference compressive strain, when being in opening state, the binding site of butterfly plate and rubber valve seat upper and lower end still is among the compressive strain all the time.Rubber material is very easily aging and follow the string under this compressive state for a long time, makes because of rubber material is aging thus that valve just begins leakage when must seal pressure being elevated to a certain degree.It is special when valve is in closed condition, after the easy breakthrough of rubber valve seat upper and lower end binding site produces and leaks, pressure medium will leak among the slit between valve body and the rubber valve seat, and circle is heaved and be produced piston ring, and at this moment butterfly plate is suffocated and can't opens.So the sealing reliability of this valve and working life are very limited, it only is applicable to the position that frequent switch opens and closes and changes easily.Because the rubber valve seat sectional dimension is big, it is many to consume rubber material, so the cost of production height in addition.
Another rubber butterfly bamper is an eccentric rubber seal butterfly valve, and the sealing configuration of this butterfly valve mainly is because the problem of the rapid ageing failure of interference compressive strain for the rubber valve seat that overcomes axis symmetric form butterfly valve.The sealing configuration of this product is that rubber valve seat is departed from butterfly plate, valve rod and valve body center, and the gyration center of valve rod also departs from the valve body center simultaneously, thereby forms two eccentric structures.The butterfly plate cylindrical breaks away from rubber valve seat fully when valve open is in opening state like this, and the sealing surface position of eccentric rubber valve seat just is in the free state of not having compression, has solved rubber valve seat because the ageing failure problem that compressive strain produces.But these two kinds of sealing pairs are diverse two kinds of sealing configurations.The height that how much depends on the medium nominal pressure of axis symmetric form butterfly valve rubber valve seat interference decrement, the orientation independent of it and medium active force.So axis symmetric form rubber seal butterfly valve to the flow direction of medium without limits promptly can two way sealed.And eccentric rubber seal butterfly valve is different, and it is to rely on butterfly plate to close the back impacting force that eccentric valve seat produces is formed sealing force.This impacting force has two power synthetic, one is that butterfly plate circular arc sealing surface center and eccentric sealing surface of seat center are designed by interference fit when designing the center of valve rod, during valve closing, butterfly plate cylindrical sealing surface promptly is pressed on the valve seat like this, and Here it is closes power of enforcement.Another is exactly the medium active force.Two power acts on the eccentric rubber valve seat by butterfly plate jointly and forms certain specific pressure, Here it is actual seal pressure q.General industry is must satisfy actual seal pressure q greater than necessary seal pressure q with the basic principle of sealed valve design
MF, simultaneously again less than the specific pressure allowable [q] of sealing material, valve could reliable sealing, and their relation is q
MF＜q＜[q].But after the direction of medium active force changed, when promptly the flow direction of pipeline medium was opposite, q＜q will appear in this eccentric rubber butterfly bamper
MFSituation, at this moment valve will leak.So the seal butterfly valve of similar this eccentric structure all belongs to folk prescription to sealed valve.
Because the sealing mechanism of above product all belongs to the pressure forced seal, so the moment when valve switch opens and closes is big especially, because the cross section structure size of rubber valve seat is big, so the consumption of rubber material is just high especially, thereby increased cost of production, so the rationality of sealability of the said goods and structure all there are obvious defects and deficiency.
Summary of the invention
The object of the present invention is to provide a kind of structure simpler, sealability is more reliable, and fully can two way sealed, working life speciality, torsional moment is littler and cost of production is lower three eccentric two-way self-tightening sealing rubber butterfly valve.Its technology and organization plan are achieved in that the structure of component such as comprising valve body, valve rod, butterfly plate, trim ring and rubber seal, rubber seal is fixedly mounted on the butterfly plate by trim ring, it is characterized in that: the cross section structure of rubber seal is that the rubber sheet gasket between its flat circumference head and butterfly plate and the trim ring is combined into one, form the combined type rubber ring of flat side-rounded shape
The self-tightening decrement of the flat circumference of a rubber ring cross section external arc diameter was represented with code name Sq when butterfly valve cut out.The flat circumference cross section external arc diameter during groove width that forms by butterfly plate and trim ring=rubber ring free state, and the both sides of sealing surface must process transition arc, and transition arc size 〉=self-tightening decrement Sq is pressed the Sq rounding and is determined for the millimeter integer.The matching gap of butterfly plate cylindrical and valve body sealing surface endoporus is δ in addition, its minimum clearance δ min=Sq/5, maximal clearance δ max=Sq/3.
The positive effect of implementing after this technology is: adopted the combined type rubber ring of flat circumference head shapes, successfully realized the self-tightening sealing principle is applied in the design of butterfly valve product, thereby made sealability more reliable, and fully can two way sealed.Because the rubber ring sectional dimension is little, thereby the consumption of expensive rubber material is descended significantly.Because the sealing surface friction torque of self-tightening sealing structure is more much smaller than forced seal structure, so valve actuator of selecting for use and related components are all much smaller, because valve body sealing surface has adopted contact to break away from three superior eccentric bevel circular cone sealing surfaces of performance, and through strict rationally definite rubber ring self-tightening decrement Sq and the matching gap δ of calculating, and rationally determine the size of sealing surface transition arc, effectively avoided the phenomenon of rubber ring generation " side cut " and " squeezing the crack ", thereby improved 2 times working life that makes rubber ring, comprehensive cost of production descends 50% significantly.
Description of drawings
Fig. 1 is the structural representation of three eccentric two-way self-tightening sealing rubber butterfly valve.
Fig. 2 is the top plan view of Fig. 1.
Fig. 3 is rubber ring cross section structure figure.
Fig. 4 is the compressive strain figure of the flat circumference of medium active force=0 an o'clock rubber ring cross section external arc R.
The compressive strain figure of the flat circumference of rubber ring cross section external arc R when Fig. 5 is postive direction for the direction of medium active force.
Fig. 6 is the compressive strain figure of the direction flat circumference of rubber ring cross section external arc R in the other direction time of medium active force;
Wherein, 1-valve body, 2-valve rod, 3-butterfly plate, 4-trim ring, 5-rubber ring;
Embodiment:
Below in conjunction with the accompanying drawing valve aperture is that 300 millimeters three eccentric two-way self-tightening sealing rubber butterfly valve (following represent with code name DN300) is example, and the present invention is further described.
See Fig. 1, Fig. 2, three eccentric two-way self-tightening sealing rubber butterfly valve is made up of parts such as valve body 1, valve rod 2, butterfly plate 3, trim ring 4 and rubber rings 5, and wherein butterfly plate 3 is assembled together by valve rod 2 and valve body 1, and butterfly plate 3 forms one with valve rod 2 by locating stud.
See Fig. 1, Fig. 2, when valve rod 2 was done 90 ° of revolutions by drive unit, butterfly plate is the open and close (dashed graph among Fig. 2 is the opening state of butterfly plate) of the valve of revolution realization simultaneously also.The flat circumference head part of rubber ring 5 is closed in the groove that is formed by trim ring 4 and butterfly plate 3, the flat circumference of a rubber ring cross section external arc diameter d among its groove width=Fig. 3, just 2 times of the flat circumference of a rubber ring cross section outer arc radius R, groove width=5 of DN300 butterfly plate and trim ring formation here.The flat circumference of rubber ring cross section external arc diameter d=5 just.
See Fig. 4, when valve pipeline medium active force P=0, the flat circumference of rubber ring 5 a cross section external arc R is compressed distortion, and compression seal power p is given in formation thus
1, (p
1Be equivalent to the necessary seal pressure q in the conventional valves design
MF), by formula: p
1=E*f* ε
c(MPa) calculating is determined:
In the formula: p
1_ _ _ gives compression seal power (MPa).
The Young's modulus of E___ sealing material, it is the nitrile rubber of Shao Er A70 degree that DN300 adopts hardness, gets 4MPa.
The coefficient that f___ is relevant with the rubber ring material gets 1.27
ε
cThe compressibility of the flat circumference an of _ _ _ rubber ring cross section external arc diameter d
ε
c＝Sq/d
In the formula: the self-tightening decrement (mm) of the flat circumference of a Sq___ rubber ring cross section external arc diameter d
Sq＝0.1564d+0.1069(mm)
The flat circumference of a d___ rubber ring cross section external arc diameter (mm)
The above formula of relevant data substitution with DN300:
p
1＝4×1.27×(0.1564×5+0.1069)/5(Mpa)
＝0.9032Mpa
Because rubber is a kind of viscoelastic material, be similar to high viscosity fluid, it can be directly passed to valve body sealing surface with pressure medium, and just the medium active force that indicates among Fig. 5, Fig. 6 passes to the sealing surface of valve body 1 by rubber ring 5, and this active force is made as p
2, when valve pipeline medium pressure is nominal pressure PN, i.e. medium active force p
2=PN, at this moment to act on the actual pressure stress on valve body 1 sealing surface be p to rubber ring 5
1With p
2Sum, i.e. q=p
1+ p
2When the nominal pressure PN=1.6Mpa of DN300, the above formula of relevant data substitution of DN300 is tried to achieve the q=0.9032+1.6=2.5032MPa of DN300, because " permissible compression stress [the q]=5MPa of the rubber material of valve design handbook regulation that the valve industry is general, so above result of calculation just forms the relation of 0.9032MPa＜2.5032Mpa＜5Mpa, the basic principle that just meets valve design fully, i.e. relation q
MFRegulation and the requirement of＜q＜[q] illustrate that sealing is reliable.
The transition arc r of valve body 1 sealing surface both sides is tried to achieve by the self-tightening decrement Sq=0.1564d+0.1069 formula of rubber ring 5 among Fig. 5, Fig. 6, Sq=0.1564 * 5+0.1069=0.889 of DN300, with this as a result rounding for the millimeter integer equal 1, so the transition arc r of DN300 valve body sealing surface both sides gets 1.
For guaranteeing that " squeezing the crack " phenomenon does not take place rubber ring, the sealing surface endoporus matching gap of the cylindrical of butterfly plate 3 and valve body 1 is to determine its minimum clearance δ min=Sq/5, maximal clearance δ max=Sq/3 like this among Fig. 5, Fig. 6.These two formula of Sq value substitution of DN300 are got: δ min=0.889/5=0.178, δ max=0.889/3=0.296, then this result is compared with NBS " tolerance fit ", in Spielpassung, compare movingly, so the class of fit of butterfly plate 3 cylindricals and valve body 1 sealing surface endoporus is H8/d8 near the H8/d8 level.
By Fig. 5, Fig. 6 as can be seen rubber ring 5 in the groove of butterfly plate 3 and trim ring 4, be in free state all the time, when the direction of medium active force p2 changed, the compressive strain of rubber ring 5 also just changed thereupon, so can realize two-way self-tightening sealing reliably.
The sectional area of rubber ring of the present invention is very little as seen from Figure 3, and DN300 has only 60mm
2, and the rubber valve seat sectional area of the axis symmetric form rubber butterfly bamper of same size is up to 548mm
2, the rubber valve seat sectional area of eccentric rubber butterfly bamper also has 160mm
2, be respectively 9.13 times and 2.67 times of rubber ring of the present invention, so its cost of material obviously descends.
From above description, as can be seen because valve body sealing surface has adopted contact to break away from three superior eccentric bevel circular cone sealing surfaces of performance, and rationally determine butterfly plate cylindrical and the matching gap of valve body sealing surface endoporus, the rational size of definite each transition arc of sealing surface, avoided the rubber ring generation " to squeeze the crack " and the phenomenon of " side cut " fully, guaranteed the working life of rubber ring, after tested, the life test of model machine, the switch number of times is up to 40,000 times, rubber ring is still excellent, has obtained very satisfied effect.
Claims (4)
1. three eccentric two-way self-tightening sealing rubber butterfly valve, the structure that comprises component such as valve body, valve rod, butterfly plate, trim ring and rubber seal, rubber seal is fixedly mounted on the butterfly plate by trim ring, it is characterized in that: its cross section structure is that the flat circumference head of rubber seal and the rubber sheet gasket between butterfly plate and the trim ring are combined into one, form the combined type rubber seal of flat side-round end
The self-tightening decrement Sq of the flat circumference of a rubber ring cross section external arc diameter d calculated as follows when butterfly valve cut out:
Sq＝0.1564d+0.1069(mm)
In the formula: Sq---the self-tightening decrement (mm) of the flat circumference of a rubber ring cross section external arc diameter d
D---the cross section external arc diameter (mm) of the flat circumference head of rubber ring;
2. three eccentric two-way self-tightening sealing rubber butterfly valve according to claim 1: it is characterized in that: the axial thickness of flat circumference head when the sectional shape of rubber seal, the groove width that forms by butterfly plate and trim ring=rubber ring free state.
3. three eccentric two-way self-tightening sealing rubber butterfly valve according to claim 1: it is characterized in that: the both sides of valve body sealing surface must process transition arc, and transition arc size 〉=self-tightening decrement Sq is pressed the Sq rounding and determined for the millimeter integer.
4. three eccentric two-way self-tightening sealing rubber butterfly valve according to claim 1: it is characterized in that: the matching gap δ of butterfly plate cylindrical and valve body sealing surface endoporus, its minimum clearance δ min=Sq/5, maximal clearance δ max=Sq/3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100264471A CN100482986C (en) | 2006-05-11 | 2006-05-11 | Three eccentric two-way self-tightening sealing rubber butterfly valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100264471A CN100482986C (en) | 2006-05-11 | 2006-05-11 | Three eccentric two-way self-tightening sealing rubber butterfly valve |
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| Publication Number | Publication Date |
|---|---|
| CN101070920A CN101070920A (en) | 2007-11-14 |
| CN100482986C true CN100482986C (en) | 2009-04-29 |
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ID=38898271
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100264471A Active CN100482986C (en) | 2006-05-11 | 2006-05-11 | Three eccentric two-way self-tightening sealing rubber butterfly valve |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330823A (en) * | 2011-08-18 | 2012-01-25 | 阀安格水处理系统(太仓)有限公司 | Three-eccentric soft-sealing butterfly valve |
| CN102518818A (en) * | 2011-12-08 | 2012-06-27 | 阀安格水处理系统(太仓)有限公司 | Method for manufacturing soft sealing ring of three-eccentric center soft sealing butterfly valve |
| CN103574073A (en) * | 2012-08-08 | 2014-02-12 | 进典工业股份有限公司 | Three-eccentric valve with symmetric leakage stop ring |
| TWI555934B (en) * | 2014-12-16 | 2016-11-01 | 進典工業股份有限公司 | Eccentric valve and manufacture method thereof |
| CN114161169B (en) * | 2021-12-31 | 2024-01-26 | 霍山嘉远智能制造有限公司 | Preheating cutter for machining inner hole R groove of butterfly valve body |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2075283U (en) * | 1990-10-23 | 1991-04-17 | 天津市塘沽阀门厂 | Corrosion resisting eccentricity butterfly valve |
| EP0756115B1 (en) * | 1995-07-28 | 1999-03-24 | Erhard GmbH & Co | Gate valve |
| CN2549273Y (en) * | 2002-06-04 | 2003-05-07 | 杨瑞成 | Three eccentric conic sealing butterfly valve |
| CN2594565Y (en) * | 2002-12-24 | 2003-12-24 | 天津塘沽瓦特斯阀门有限公司 | Eccentric butterfly valve with flangeseal |
| JP2004332882A (en) * | 2003-05-12 | 2004-11-25 | Japan Water Works Association | Butterfly valve equipped with flooding function |
-
2006
- 2006-05-11 CN CNB2006100264471A patent/CN100482986C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2075283U (en) * | 1990-10-23 | 1991-04-17 | 天津市塘沽阀门厂 | Corrosion resisting eccentricity butterfly valve |
| EP0756115B1 (en) * | 1995-07-28 | 1999-03-24 | Erhard GmbH & Co | Gate valve |
| CN2549273Y (en) * | 2002-06-04 | 2003-05-07 | 杨瑞成 | Three eccentric conic sealing butterfly valve |
| CN2594565Y (en) * | 2002-12-24 | 2003-12-24 | 天津塘沽瓦特斯阀门有限公司 | Eccentric butterfly valve with flangeseal |
| JP2004332882A (en) * | 2003-05-12 | 2004-11-25 | Japan Water Works Association | Butterfly valve equipped with flooding function |
Non-Patent Citations (4)
| Title |
|---|
| 新型自动密封蝶阀. 陈卫丽.机电设备，第4期. 1995 |
| 新型自动密封蝶阀. 陈卫丽.机电设备，第4期. 1995 * |
| 蝶阀橡胶密封圈"翻舌"的解决方法. 郁正涛.阀门，第1期. 1998 |
| 蝶阀橡胶密封圈"翻舌"的解决方法. 郁正涛.阀门，第1期. 1998 * |
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|---|---|
| CN101070920A (en) | 2007-11-14 |
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Owner name: SHANGHAI MAODE ENTERPRISE GROUP CO., LTD. Free format text: FORMER OWNER: SHANGHAI MAODE ENTERPRISE DEVELOPMENT CO., LTD. Effective date: 20090904 |
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Effective date of registration: 20090904 Address after: No. 718, Huicheng Road, Nanhui Industrial Park, Shanghai Patentee after: Shanghai Maud Group Co., Ltd. Address before: No. 718, Huicheng Road, Nanhui Industrial Park, Shanghai Patentee before: Shanghai Maode Development Co., Ltd. |
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Effective date of registration: 20160728 Address after: Pudong New Area town 201300 Shanghai Huicheng Road No. 718 Building 2 Patentee after: Shanghai Honggong Machinery Technology Co.,Ltd. Address before: 201300, No. 718, Huicheng Road, Nanhui Industrial Park, Shanghai Patentee before: Shanghai Maud Group Co., Ltd. |