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WO1997046818A1 - Vanne papillon - Google Patents

Vanne papillon Download PDF

Info

Publication number
WO1997046818A1
WO1997046818A1 PCT/GB1997/001460 GB9701460W WO9746818A1 WO 1997046818 A1 WO1997046818 A1 WO 1997046818A1 GB 9701460 W GB9701460 W GB 9701460W WO 9746818 A1 WO9746818 A1 WO 9746818A1
Authority
WO
WIPO (PCT)
Prior art keywords
butterfly
housing
sealing edge
valve
spindle
Prior art date
Application number
PCT/GB1997/001460
Other languages
English (en)
Inventor
Colm Michael Patrick Keegan
Original Assignee
Wabco Automotive U.K. Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wabco Automotive U.K. Limited filed Critical Wabco Automotive U.K. Limited
Priority to BR9709498A priority Critical patent/BR9709498A/pt
Priority to EP97924127A priority patent/EP0901588A1/fr
Publication of WO1997046818A1 publication Critical patent/WO1997046818A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F02D9/06—Exhaust brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1005—Details of the flap
    • F02D9/101—Special flap shapes, ribs, bores or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1005—Details of the flap
    • F02D9/1025—Details of the flap the rotation axis of the flap being off-set from the flap center axis
    • 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
    • F16K1/222—Shaping of the valve member
    • 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
    • F16K1/24—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 valve members that, on opening of the valve, are initially lifted from the seat and next are turned around an axis parallel to the seat

Definitions

  • the present invention relates to a butterfly valve, and particularly but not exclusively to a butterfly of a pressure modulation valve for an exhaust brake of a vehicle.
  • Pressure modulation valves in general, and exhaust pressure modulation valves (EPM valves) in particular are designed to open when the fluid pressure applied to the valve reaches a predetermined level.
  • a butterfly is typically pivotal ly mounted in a flow pipe on a spindle offset from the axis of the pipe. Accordingly, the fluid pressure generates a torque about the spindle, and this torque may be regulated by a spring or an actuator applying restraining torque to the spindle.
  • hysteresis is encountered due to the action of friction on the butterfly. This hysteresis is undesirable in an exhaust brake because precise control of backpressure is consequently hindered.
  • Friction at the spindle has been found to be roughly proportional to the spindle diameter. Since in practice the spindle diameter is selected in accordance with the bore diameter of the flow pipe, friction may be said to be proportional to the bore diameter. Torque applied to a butterfly by a fluid pressure is proportional to the offset of the spindle from the axis of the flow pipe, and so for a predetermined bore diameter it can be seen that the ratio of torque to friction may be increased by increasing the offset. This in turn will decrease the hysteresis inherent to the valve .
  • an offset pivot axis causes problems of clearance, particularly when the butterfly is fully open.
  • segments of the butterfly in the region of the spindle must be cut away.
  • clearance bushes In order to prevent leakage of fluid around the butterfly at the cut away segments, clearance bushes must be provided to fill the gaps between the side wall of the flow pipe and the sealing edge of the butterfly. This leads to a loss of effective butterfly area and increased manufacturing expense.
  • a butterfly valve comprising a cylindrical tubular housing having an interior wall defining a fluid flow path, a butterfly pivotal ly mounted in the housing on an axis coplanar with the butterfly and perpendicular to and offset from the longitudinal axis of the cylindrical housing, the butterfly defining a sealing edge, and the valve including stop means to limit the maximum opening angle of the butterfly in use, wherein when the butterfly is in a fully closed state, the sealing edge thereof is sealingly contiguous with the interior wall, and when the valve is in a fully open state the butterfly engages said stop means such that the sealing edge is contained in an envelope defined by the projection of the open butterfly in the direction of the axis of the housing, and the plane defined by the sealing edge defines an oblique angle with the axis of the housing.
  • the butterfly comprises a spindle housing and a spindle mounted therein, wherein the envelope is defined by the projection of the spindle housing.
  • the sealing edge is contiguous with the envelope.
  • the practical effect of the invention is that a greater offset can be provided (and thus reduced hysteresis) for a given size of clearance bush.
  • the manufacturing cost does not increase with offset as in the prior arrangement and the leakage area in the gap between the butterfly and clearance bush is not increased.
  • the oblique angle is greater than 2° and less than 10°. In a preferred embodiment, the oblique angle is 5°.
  • This invention advantageously reduces the problems associated with providing clearance for an offset butterfly as it approaches the fully open condition. It is a further advantage of the invention that the working angular travel of the butterfly is reduced, without loss of effective cross-sectional area; this reduces the required stroke of an actuator connected to the spindle or other means of opposing torque generated by the butterfly.
  • the invention also allows the clearance bushes to be dispensed with in the case of a small offset.
  • the butterfly is shaped so as to be streamlined in the flow direction.
  • the butterfly may comprise side projections of aerofoil section.
  • a butterfly valve comprising a tubular housing having an interior wall defining a fluid flow path, a butterfly pivotally mounted in the housing on an axis coplanar with the butterfly and perpendicular to the axis of the housing, wherein the butterfly is shaped so as to be streamlined in the flow direction.
  • the butterfly comprises side projections of aerofoil section.
  • the side projections are preferably shaped so as to define a boundary layer about the butterfly in use which is not susceptible to the formation of separation zones between said butterfly and said boundary layer.
  • the external profile of the butterfly may present a substantially smooth non-discontinuous surface from the maximum spindle diameter to the region of the edge thereof.
  • the butterfly may have such a smooth surface on one or both sides thereof, and or on one or both faces of one limb thereof, or any practicable and effective combination.
  • a third aspect of the invention there is provided a method of opening a butterfly valve from a fully closed state to a fully open state, the butterfly valve comprising a cylindrical tubular housing having an interior wall defining a third flow path, a butterfly pivotally mounted in the housing on an axis coplanar with the butterfly and perpendicular to and offset from the longitudinal axis of the cylindrical housing, the butterfly defining a sealing edge which in the fully closed state is sealingly contiguous with the interior wall, the method comprising the step of rotating the butterfly to a stop position at which the sealing edge is contained in an envelope defined by the projection of the open butterfly and the plane defined by the sealing edge defines an oblique angle with the axis of the housing.
  • Figure 1 is an elevation in the flow direction of a prior art example butterfly valve with the butterfly closed.
  • Figure 2 corresponds to Figure 1 and shows the butterfly open
  • FIG 3 is a partial section through the valve of Figure 1 showing the butterfly in its fully open condition
  • Figure 4 is an elevation in the flow direction of a butterfly valve in accordance with the invention, with the butterfly closed;
  • Figure 5 corresponds to Figure 4 and shows the butterfly open
  • Figure 6 is a partial section of the inventive valve and corresponding to Figure 2.
  • Figure 7 corresponds to Figure 6 and is an elevation showing a schematic external travel stop.
  • a prior art butterfly valve 10 comprises a right cylindrical tubular housing 12 and a substantially circular butterfly 14. Dimensions are exaggerated in order to illustrate features of the valve.
  • the housing and butterfly typically of cast iron.
  • the diameter of the butterfly 14 is substantially the same as the internal diameter of the housing 12, thereby enabling the butterfly 14 to be used to obstruct the flow of fluid through the housing 12 when in the closed condition.
  • the gap between the butterfly 14 and the housing 12 is enlarged for reasons of clarity.
  • the butterfly 14 comprises a tubular spindle sleeve 16
  • the spindle sleeve 16 receives a spindle 17.
  • a keying arrangement (not shown) is used to engage the sleeve 16 with spindle 17 for pivotal movement of the butterfly 14 with the spindle 17.
  • the spindle 17 is journalled in the housing 12 perpendicular to the longitudinal axis of the housing 12. On one side the spindle 17 passes through the housing 12 and can be connected to an actuator (not shown) for control of the butterfly 14.
  • the butterfly In the closed condition the butterfly is adapted to shut at an angle to the axis of the housing, thereby to provide effective seal; the edge of the butterfly may be machined accordingly.
  • the closing angle may be rather large for example 25° to the axis of the housing where significant thermal expansion must be accommodated.
  • the butterfly 14 is truncated by the removal of two segments thereof of equal area from opposite sides of the butterfly 14 adjacent the spindle 17. The segments are formed by parallel chords of the circular butterfly 14, the chords being perpendicular to the axis of the spindle 17. The resulting flats 18 are required to enable the butterfly to swing through a full right angle and attain the position illustrated in Figures 2 and 3: the butterfly 14 being substantially parallel to fluid flow through the butterfly valve housing 12, the flow direction being indicated by arrow A.
  • FIG. 18 illustrates the effective area of the butterfly.
  • Bushes 19 are required in order to occlude the clearances created by the flats 18, but they reduce the effective cross sectional area of the housing, and due to their rather complicated shape they increase manufacturing expense.
  • Large bosses 20 are required to accommodate the bushes 19.
  • Figure 2 illustrates the effective cross-sectional area of the butterfly valve in the open condition, comprising the areas 21A and 21B.
  • Figure 3 shows the relatively massive construction of the butterfly which is necessary for strength and dimensional stability.
  • the wings of the butterfly are of relatively large thickness, but are reduced at the edge to provide a narrow sealing land 22 for abutment with the housing 12.
  • the large part of the circumference formed by flats 18 cannot be sealed by abutment, and since an operating clearance is required they constitute an inevitable leakage path.
  • a butterfly valve 100 is constructed similarly to the butterfly valve of Figures 1-3.
  • the butterfly 114 has an offset axis, but lacks flats. Accordingly, bushes to occlude gaps created by cut ⁇ outs are not required.
  • the butterfly 114 is shown in the open condition in Figure 5.
  • the butterfly 114 further comprises solid shaped portions 124 arranged to deflect fluid flowing through the housing 112 around the butterfly.
  • the shaped portions 124 are arranged on either side of the butterfly downstream of the leading edge of the butterfly 114 and of the spindle sleeve 116, as illustrated, and are smoothly curved to present a somewhat spherical surface.
  • the projected area of the butterfly 114 in the direction of the longitudinal axis of the housing 112 is at a minimum, being defined by the projection of the spindle sleeve 116 which is the thickest part of the butterfly.
  • the butterfly 114 lies at an angle ⁇ (approximately 5°) from the direction of the axis of the tubular housing 112. Such an angle allows the butterfly 114 to turn to the fully open position without the need for flats to prevent fouling of the butterfly 114 on the sidewall of the housing 112.
  • FIG. 7 corresponds to Fig. 6 and shows an external boss 130 of the housing 112 engageable with a schematic operating arm 131 of the spindle 117; a simple screw threaded stop 132 is illustrated.
  • the butterfly is closed by moving the arm 131 in the direction of arrow A by any suitable means, for example a pneumatic actuator.
  • the solid shaping of the butterfly provides the necessary strength and support for the sealing edge 125 thereof, and thus the sealing edge 125 can be somewhat narrower than the prior art.
  • the preferred embodiment permits an offset to be provided in a butterfly valve which does not have the cut- outs hitherto necessary to enable the butterfly to lie parallel with the axis of the housing when in the open condition.
  • the butterfly can also have a lower drag coefficient when open than prior art butterflies, since stagnation and separation zones can be reduced by the provision of the shaped portions.
  • the butterfly could also include shaping of both sides of both limbs, thereby to improve flow in the duct, though as will be appreciated the rounded part of the spindle sleeve 116, as illustrated, does not provide significant resistance to flow.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lift Valve (AREA)

Abstract

Une vanne papillon (100) destinée à être utilisée dans un frein sur échappement d'un véhicule comprend un papillon (114) qui, en position complètement ouverte, n'est pas perpendiculaire à la direction d'écoulement, mais forme avec elle un angle légèrement oblique. Le papillon est placé dans le boîtier du tourillon afin de ne pas obturer la section d'écoulement, et peut être façonné pour diminuer le frottement due à l'écoulement et la turbulence dans la couche limite.
PCT/GB1997/001460 1996-06-01 1997-05-29 Vanne papillon WO1997046818A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR9709498A BR9709498A (pt) 1996-06-01 1997-05-29 Válvula borboleta
EP97924127A EP0901588A1 (fr) 1996-06-01 1997-05-29 Vanne papillon

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9611484.8 1996-06-01
GBGB9611484.8A GB9611484D0 (en) 1996-06-01 1996-06-01 A butterfly valve

Publications (1)

Publication Number Publication Date
WO1997046818A1 true WO1997046818A1 (fr) 1997-12-11

Family

ID=10794632

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/001460 WO1997046818A1 (fr) 1996-06-01 1997-05-29 Vanne papillon

Country Status (4)

Country Link
EP (1) EP0901588A1 (fr)
BR (1) BR9709498A (fr)
GB (1) GB9611484D0 (fr)
WO (1) WO1997046818A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000071334A (ko) * 1999-02-10 2000-11-25 존 씨. 메티유 공기 흡입 매니폴드용 저 누설 공기 밸브, 공기 흡입매니폴드용 저 누설 공기 밸브 조립체 및 그 제조 방법과,저 누설 매니폴드
WO2006078607A1 (fr) * 2005-01-18 2006-07-27 Cooper-Standard Automotive Inc. Joint de soupape a volet et fermeture de derivation
CN103615325A (zh) * 2013-11-29 2014-03-05 东风小康汽车有限公司重庆分公司 发动机排气制动蝶阀
CN103615326A (zh) * 2013-11-29 2014-03-05 东风小康汽车有限公司重庆分公司 汽车辅助制动用排气蝶阀

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2276524A1 (fr) * 1974-06-27 1976-01-23 Maschf Augsburg Nuernberg Ag Papillon d'etranglement a fonctionnement automatique actionne par la pression
EP0029110A1 (fr) * 1979-11-14 1981-05-27 Helmut Behrens Vanne papillon à double excentricité
US4489917A (en) * 1983-02-10 1984-12-25 Baumann Hans D Low torque valve disc for lined butterfly valves
EP0499821A1 (fr) * 1991-02-16 1992-08-26 Kempchen & Co. GmbH Elément obturateur pour fluides
EP0503492A2 (fr) * 1991-03-08 1992-09-16 Matsushita Electric Industrial Co., Ltd. Vanne papillon
US5342019A (en) * 1992-09-02 1994-08-30 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh Throttle flap construction for an exhaust gas duct of an internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2276524A1 (fr) * 1974-06-27 1976-01-23 Maschf Augsburg Nuernberg Ag Papillon d'etranglement a fonctionnement automatique actionne par la pression
EP0029110A1 (fr) * 1979-11-14 1981-05-27 Helmut Behrens Vanne papillon à double excentricité
US4489917A (en) * 1983-02-10 1984-12-25 Baumann Hans D Low torque valve disc for lined butterfly valves
EP0499821A1 (fr) * 1991-02-16 1992-08-26 Kempchen & Co. GmbH Elément obturateur pour fluides
EP0503492A2 (fr) * 1991-03-08 1992-09-16 Matsushita Electric Industrial Co., Ltd. Vanne papillon
US5342019A (en) * 1992-09-02 1994-08-30 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh Throttle flap construction for an exhaust gas duct of an internal combustion engine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000071334A (ko) * 1999-02-10 2000-11-25 존 씨. 메티유 공기 흡입 매니폴드용 저 누설 공기 밸브, 공기 흡입매니폴드용 저 누설 공기 밸브 조립체 및 그 제조 방법과,저 누설 매니폴드
EP1028238A3 (fr) * 1999-02-10 2001-01-03 Eaton Corporation Clapet d'air à faible fuite pour système d'admission d'air à géométrie variable
WO2006078607A1 (fr) * 2005-01-18 2006-07-27 Cooper-Standard Automotive Inc. Joint de soupape a volet et fermeture de derivation
GB2435588A (en) * 2005-01-18 2007-08-29 Cooper Standard Automotive Inc Butterfly valve seal and bypass shutoff
CN103615325A (zh) * 2013-11-29 2014-03-05 东风小康汽车有限公司重庆分公司 发动机排气制动蝶阀
CN103615326A (zh) * 2013-11-29 2014-03-05 东风小康汽车有限公司重庆分公司 汽车辅助制动用排气蝶阀
CN103615326B (zh) * 2013-11-29 2016-02-24 东风小康汽车有限公司重庆分公司 汽车辅助制动用排气蝶阀
CN103615325B (zh) * 2013-11-29 2016-03-23 东风小康汽车有限公司重庆分公司 发动机排气制动蝶阀

Also Published As

Publication number Publication date
EP0901588A1 (fr) 1999-03-17
BR9709498A (pt) 1999-08-10
GB9611484D0 (en) 1996-08-07

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