EP3377790A1 - Vanne de regulation d'un debit de fluide - Google Patents
Vanne de regulation d'un debit de fluideInfo
- Publication number
- EP3377790A1 EP3377790A1 EP16809990.1A EP16809990A EP3377790A1 EP 3377790 A1 EP3377790 A1 EP 3377790A1 EP 16809990 A EP16809990 A EP 16809990A EP 3377790 A1 EP3377790 A1 EP 3377790A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- closed position
- zone
- conduit
- opening
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
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
- F16K1/42—Valve seats
-
- 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
- F16K1/54—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
Definitions
- the present invention relates to a fluid flow control valve, for example used in an exhaust gas recirculation circuit (or EGR circuit of the English "Exhaust Gas Recirculation") of a motor vehicle engine.
- the field of the present invention is that of the equipment for supplying the motor, in particular the actuators or metering valves which participate in the operation of the internal combustion engines.
- Such a valve comprises a valve body comprising a first conduit ensuring the admission of the exhaust gas into the valve and a second conduit ensuring the gas outlet of the valve.
- such a valve generally comprises a valve or valve slidably mounted in one of the conduits of the valve between a closed position in which the valve is applied against a seat arranged in the conduit and an extreme open position in which the valve is removed from the seat.
- the valve is moved by an actuator between its closed position and its open position to adjust the spacing or lift of the valve relative to its seat and thus the section of the exhaust gas, the extreme opening position ensuring a maximum flow of exhaust gases in the valve.
- a solution developed by the Applicant was to create a restriction by acting on the shape of the valve, also called valve head, thus reducing the flow of recirculated exhaust gas on the low levees and the intermediate lifts.
- the invention proposes to provide a valve valve having a precise control of the flow of the fluid especially for very low flow rates.
- the present invention relates to a fluid flow control valve comprising:
- valve movable in translation in the conduit over a predetermined stroke between a closed position and an extreme open position
- valve and the opening are arranged in such a way that the flow of fluid flowing between the valve and the opening has a variation whose slope increases with the stroke of the valve relative to the closed position on at least a portion of the predetermined stroke from the closed position, for a fluid temperature and a pressure difference between upstream and downstream of the given opening.
- the shape of the opening and / or the shape of the valve are arranged in such a way that the flow of fluid flowing between the valve and the opening has a variation whose slope increases with the running the valve over at least a portion of the predetermined stroke from the closed position for a given temperature and pressure difference.
- the fluid flow control valve according to the invention may also comprise one or more of the following characteristics, considered individually or in any technically possible combination:
- the duct comprises a fluid flow control zone whose one end is delimited by the line of contact with the valve when it is in the closed position, the control zone comprising, facing the valve, a curvilinear profile surface; flaring from the nip in the sliding direction of the valve from the closed position to the extreme open position;
- control zone comprises a second zone comprising a curvilinear profile surface of opposite concavity with respect to the concavity of the first zone;
- the curvilinear profile of the flared surface of the control zone comprises an alternation of concave portions and convex portions spaced apart by linear segments;
- control zone extends over at least a quarter of the predetermined stroke between the closed position and the extreme open position, preferably on at least one third of the predetermined stroke, preferably more preferably on at least half the predetermined race; the control zone extends over at least 4 mm along the longitudinal axis of the duct;
- the first zone extends over at least 5% of the extent of the control zone
- the second zone extends over at least 30% of the extent of the control zone
- the control zone is formed by the inner wall of the conduit and / or a seat attached to the conduit;
- valve is an exhaust gas recirculation valve
- control zone comprises a first zone delimited by the line of contact with the valve when it is in the closed position, the first zone having a complementary surface of a portion of the surface of the valve delimited by the nip ;
- the surface of the first zone has a curvilinear profile comprising an arc of a circle;
- the surface of the second zone has a curvilinear profile comprising an arc of a circle;
- the arc of the profile of the second zone has a radius of between 2 and 8 cm, preferably 5 cm;
- the first zone and the second zone are spaced apart by an intermediate zone comprising a linear profile surface
- the intermediate zone is flared linearly at an angle of between 5 ° and 15 ° with respect to the longitudinal axis of the duct, preferably 7 °;
- control zone extends over the entire predetermined path between the closed position and the extreme open position
- intermediate zone between the first zone and the second zone extends over 30% of the extent of the control zone
- the flow rate of fluid flowing between the valve and the opening varies with the stroke of the valve whose slope increases over at least 10% of the predetermined stroke from the closed position, preferably at least 20%;
- valve duct and the seat attached to the duct are made of different materials
- valve duct is made of aluminum
- the conduit of the valve is made of thermosetting polymer
- the conduit of the valve is made of thermoplastic polymer
- the seat attached to the valve pipe is made of stainless steel
- the seat attached to the valve channel is made of aluminum
- the seat attached to the valve duct is made of thermosetting polymer
- the seat attached to the valve duct is made of thermoplastic polymer
- valve and the opening are arranged in such a way that the flow rate of fluid circulating between the valve and the opening has a linear variation with the stroke of the valve on at least a part of the predetermined stroke after the variation of which the slope increases with the race.
- FIG. 1 is a partial schematic sectional view of a first embodiment of a valve according to the invention wherein the valve is in a closed position;
- FIG. 2 is a partial schematic view of the valve of FIG. 1 in which the valve is in an extreme open position
- FIG. 3 is a graph showing the variation of the flow rate of fluid flowing in a valve according to the invention as a function of the lifting of the valve relative to the seat;
- FIG. 4 is an enlarged partial schematic view of the seat of the valve and of the valve in an intermediate position between the closed position illustrated in FIG. 1 and the extreme open position illustrated in FIG. 2;
- FIG. 5 is a partial schematic sectional view of a second embodiment of a valve according to the invention wherein the valve is in a closed position.
- Figures 1 to 4 illustrate a first embodiment of a fluid flow control valve according to the invention.
- the valve 10 comprises a body 12 including in particular a conduit 14 having an opening 16 allowing the flow of fluid and delimiting a seat 18 for a valve or valve 20.
- this valve is an exhaust gas recirculation valve, also called EGR valve.
- EGR valve exhaust gas recirculation valve
- conduit 14 is intended to be connected to a fluid inlet pipe, here exhaust gas, to ensure the admission of exhaust gas into the valve, according to the arrow F illustrated in FIG. 2.
- valve also comprises another conduit (not shown) for ensuring the exit of gas from the valve, in particular with a view to their recirculation.
- this other conduit extends perpendicular to the conduit 14 defining the seat of the valve.
- the valve 20 of the valve is integral with one end of a rod forming a slide 22 mounted to slide in the conduit 14 of the body 12 between a closed or closed position and an extreme open position.
- the so-called nominal operation of the valve corresponds to the stabilized operation of the valve, that is to say, excluding transient phenomena due to the pulsating effects in the variations between the upstream and downstream pressures of the fluid.
- the opening 16 is a fluid inlet in the conduit of the valve body.
- valve head 20 moves away from the conduit 14 of the valve body as it moves from the closed position to the extreme open position.
- the valve 20 in the closed position, the valve 20 is applied against the seat 18 so as to completely close the opening.
- the valve 20 bears against the seat in the closed position, whereas in the extreme open position illustrated in FIG. 2, the valve 20 is moved away from the seat 18.
- the extreme open position also corresponds to the maximum lifting position of the valve 20 with respect to its closed position, in which the peripheral edge 21 defines with the seat 18 in line with the latter a theoretical maximum section for the passage of gases and therefore a maximum fluid flow in the valve.
- the slide rod 22 is generally slidably received in a bore in a planar wall of the valve body and extending facing the seat 18 perpendicular thereto.
- a motor (not shown) is fixed in the body 12 to drive in translation the slide 22 and thus the valve 20 via an actuator.
- the motor has an output gear connected by a set of gears to a pinion formed of a toothed sector, the gear set being mounted on the body 12.
- the output gear, the gear set and the pinion pivot about axes parallel to the sliding direction A of the slide 22.
- the pinion can be associated with a device for transforming a rotational movement of the pinion into a pinion. translational movement of the slider 22.
- the valve can also rotate on itself about the axis A while sliding in the sliding direction A of the slider 22 which is substantially perpendicular to the seat 18.
- valve 20 and the opening 16 of the valve 10 are arranged so that the flow of fluid flowing between the valve and the opening has a variation whose slope increases with the stroke of the valve relative to the closed position on at least a part of the predetermined stroke from the closed position, for a fluid temperature and a pressure difference between the upstream and the downstream of the given opening.
- the predetermined stroke is defined by the maximum lift or maximum stroke that can travel the valve head to move from the closed position to the extreme open position.
- this curve has a positive second derivative at least on a part of the curve, denoted zone A.
- Such a valve thus makes it possible to obtain a progressivity of the flow of the fluid, in particular for the low lifts.
- Such progressivity for example of the exponential type for low levees, makes it possible to obtain a high level of precision in this zone of low levees which is generally frequently used in operation.
- the shape of the opening and / or the shape of the valve are arranged so that the flow of fluid flowing between the valve and the opening has a variation whose slope increases with the stroke of the valve on at least a portion of the predetermined stroke from the closed position, for a given temperature and pressure difference.
- valve and the opening may be advantageously arranged so that the flow rate of fluid flowing between the valve and the opening has a linear variation with the stroke of the valve on at least a portion of the predetermined stroke after the variation whose slope increases with the race, as is the case for the zone B of the curve whose rise is between 4 and 6 mm for example.
- the conduit 14 comprises a fluid flow control zone 30, one end 32 of which is delimited by the contact line 34 with the valve 20 when the latter is in the closed position.
- This control zone 30 is more visible in FIG. 4 which illustrates an enlarged view of a section of the control zone of the duct and of a part of the valve head in an intermediate position between the extreme positions of closure and of 'opening.
- the control zone 30 comprises facing the valve 20 a surface 36 of curvilinear profile flaring from the contact line 34 in the translation direction T of the valve when it passes from the closed position to the extreme position opening.
- the surface 36 of the control zone 30 having a curvilinear profile has a narrow base 37 directed towards the valve head 20 and flares away to a peripheral edge 38 of the seat 18.
- the surface 36 of the control zone 30 is a surface of revolution of a curvilinear generatrix.
- the surface 36 has a diameter that expands from the end 32 delimited by the contact line 34 with the valve in the closed position towards the opening 16 of the valve in the direction T of translation of the valve in order to open the conduit.
- the curvilinear profile of the flared surface of the control zone comprises an alternation of concave portions and convex portions spaced apart by linear segments.
- the control zone 30 includes a first zone 40 delimited by the contact line 34 with the valve 20 when the latter is in the closed position.
- the first zone 40 has a surface complementary to a portion 42 of the surface of the valve 20 delimited by the nip 34.
- the surface of the first zone 40 has a curvilinear profile comprising a circular arc.
- control zone 30 comprises a second zone 44 having a curvilinear profile surface of opposite concavity with respect to the concavity of the first zone 40.
- the surface of the second zone 44 has a curvilinear profile preferably comprising a circular arc.
- the arc of the profile of the second zone 44 has a radius of between 2 and 8 cm, preferably 5 cm.
- the first zone 40 and the second zone 44 are spaced apart by an intermediate zone 46 having a linear profile surface.
- the intermediate zone 46 flares linearly at an angle ⁇ between 5 ° and 15 ° relative to the longitudinal axis A of the duct 12, preferably 7 °.
- the surface 36 of the control zone 30 has the function of improving the flow rate and especially the progressivity thereof with the lifting of the valve head especially for low flow rates.
- the shape of the surface 36 of the curved generator revolution surface control area 30 facilitates the realization of the control zone and consequently of the seat when the latter is integrally formed on the seat attached to the duct.
- the shape of the generator in an arc of circle combines simplicity of realization and efficiency.
- control zone 30 extends over at least a quarter of the predetermined stroke between the closed position and the extreme open position, preferably on at least one third of the predetermined stroke, more preferably on the less than half of the predetermined course.
- control zone 30 may extend over the entire predetermined path between the closed position and the extreme open position.
- control zone 30 extends over at least 4 mm along the longitudinal axis A of the duct 12.
- the first zone 40 extends over at least 5% of the extent of the control zone 30.
- the second zone 44 extends over at least 30% of the extent of the control zone 30.
- the intermediate zone 46 between the first zone 40 and the second zone 44 extends over 30% of the extent of the control zone 30.
- the flow rate of fluid flowing between the valve 20 and the opening 16 has a variation with the stroke of the valve whose slope increases over at least 10% of the predetermined stroke from the closed position, and preferably at the less than 20%.
- the control zone 30 is formed by the inner wall of a seat 18 attached to the conduit 14.
- the conduit 14 of the valve and the seat 18 reported on the conduit are made of different materials.
- the conduit of the valve for example aluminum while the seat attached to the pipe of the valve is stainless steel.
- the conduit of the valve may be thermoplastic polymer or thermosetting polymer.
- the seat attached to the conduit of the valve may be thermoplastic polymer or thermosetting polymer.
- the shape of the surface of the curved generator revolution surface control area facilitates the realization of the control zone and therefore the seat when it is integrally formed on the seat attached to the conduit.
- the shape of the generator in an arc of circle combines simplicity of realization and efficiency. Thus, the production of such a surface is easy by traditional means of machining and relatively inexpensive.
- valve according to the invention advantageously makes it possible to increase the total height of the seat of the valve so as to better control the progressivity of the effective cross section and consequently of the fluid flow, and thus to better control the progressiveness of the valve. Permeability of the valve throughout its opening.
- FIG. 5 illustrates a second embodiment of a valve 100 according to the invention which differs from the valve according to the first embodiment in that the movement of the valve illustrated by the arrow T 'of the closed position towards the extreme open position is in the same direction of flow of the fluid in nominal operation illustrated by the arrow F.
- the opening 1 16 of the duct 1 14 is an inlet orifice fluid in the conduit of the valve body.
- valve head 120 slides inside the conduit 1 14 of the valve body when it passes from the closed position to the extreme open position.
- control zone 130 also comprises, facing the valve 120, a surface 136 of curvilinear profile flaring out from the line of contact 134 in the direction T 'of translation of the valve when it passes from the closed position to the extreme open position.
- surface 136 of the control zone 130 having a curvilinear profile has a narrow base directed towards the valve head 120 and flares away to a peripheral edge 138 of the seat 1 18.
- control zone 30, 130 is formed by the inner wall of a seat attached to the duct.
- control zone may be formed by the inner wall of the conduit only or both on the inner wall of the conduit and the inner wall of a seat attached to the conduit.
- the conduit opening is a fluid inlet in the conduit of the valve body.
- the opening may be a fluid outlet of the valve body.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Temperature-Responsive Valves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1561169A FR3044066B1 (fr) | 2015-11-20 | 2015-11-20 | Vanne de regulation d'un debit de fluide |
PCT/FR2016/052954 WO2017085390A1 (fr) | 2015-11-20 | 2016-11-15 | Vanne de regulation d'un debit de fluide |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3377790A1 true EP3377790A1 (fr) | 2018-09-26 |
Family
ID=55361669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16809990.1A Pending EP3377790A1 (fr) | 2015-11-20 | 2016-11-15 | Vanne de regulation d'un debit de fluide |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3377790A1 (fr) |
FR (1) | FR3044066B1 (fr) |
WO (1) | WO2017085390A1 (fr) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6655653B2 (en) * | 2001-04-20 | 2003-12-02 | Woodward Governor Company | Method and mechanism to reduce flow forces in hydraulic valves |
US8360095B2 (en) * | 2008-02-01 | 2013-01-29 | Exxonmobil Chemical Patents Inc. | High-pressure valve |
US8757592B2 (en) * | 2008-10-16 | 2014-06-24 | National Oilwell Varco, L.P. | Poppet valve for pump systems with non-rigid connector to facilitate effective sealing |
-
2015
- 2015-11-20 FR FR1561169A patent/FR3044066B1/fr active Active
-
2016
- 2016-11-15 EP EP16809990.1A patent/EP3377790A1/fr active Pending
- 2016-11-15 WO PCT/FR2016/052954 patent/WO2017085390A1/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
FR3044066B1 (fr) | 2018-04-27 |
FR3044066A1 (fr) | 2017-05-26 |
WO2017085390A1 (fr) | 2017-05-26 |
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