GB2120755A - A device for throttling a media flow - Google Patents
A device for throttling a media flow Download PDFInfo
- Publication number
- GB2120755A GB2120755A GB08310162A GB8310162A GB2120755A GB 2120755 A GB2120755 A GB 2120755A GB 08310162 A GB08310162 A GB 08310162A GB 8310162 A GB8310162 A GB 8310162A GB 2120755 A GB2120755 A GB 2120755A
- Authority
- GB
- United Kingdom
- Prior art keywords
- flap
- throttling
- shell
- media flow
- shells
- 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.)
- Granted
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
- F16K1/54—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
For throttling a media flow, a flap (3) is mounted in a housing (1). A shell or baffle (5) curved in a circular-segment configuration extends along a path described by one edge (4) of the flap (3). In the width direction the shell (5) has a parabolic bulge (6). Because of the presence of the shell designed in this way, the free cross-section of flow is so varied as a function of the flap position that the coefficient of resistance of the throttling of the media flow is distinguished by an approximately linear characteristic. Preferably two identically-designed shells (5), which are arranged in a mirror-inverted manner with regard to one another, are associated with each flap edge (4). <IMAGE>
Description
SPECIFICATION
A device for throttling a media flow
This invention relates to a device for throttling a media flow by means of a flap or butterfly valve which is mounted swingably or rotatably in a housing through which the media flows.
Such devices are used for regulating purposes in aero-dynamic installations. The throttle flaps or butterfly valves used do not, however, allow optimum controlling action, because their characteristics deviate too much from a linear characteristic, which is to be considered as ideal for the controlling action.
Instead, the known one-member throttle flaps have a coefficient of resistance g which extends in accordance with a very pronounced exponential function.
The problem underlying the invention is to provide a device for throttling a media flow of which the coefficient of resistance t is distinguished by a characteristic which is as near as possible linear.
Making a start from the device described at the beginning hereof, to solve this problem it is proposed that provided fixedly in the housing is at least one shell or baffle which is curved in a circular-segment configuration and the radius of curvature of which extends along a path which is described by one edge of the flap, in which the shell has, in the direction of its width, a parabolic bulge which varies the free cross-section of flow as a function of the respective throttle angle .
The cross-sectional diminution, brought about by the flap, upon enlargement of the throttle angle +, is superimposed by the reduction in cross-section, angle-dependent in accordance with the invention, by reason of at least one curved shell. The change in crosssection, resulting from this superimposition, by way of the throttle angle +, produces an almost linear resistance characteristic.
This coefficient of resistance t is calculated in accordance with the mathematical equation t kO + k, .+, in which: = dimensional coefficient of resistance; k0 = constant = coefficient of resistance with
the flap fully open;
1 k, = constantl-degree \ degree I = rise of the characteristic; and f flap angle (degree).
In order to be able to use the throttle device, in accordance with the invention, with the linear characteristic of the coefficient of resistance meaningfully in aero-dynamic installations, the coefficient of resistance with the flap fully open should not be too high, so that not too much energy is nullified. Furthermore, the rise of the straight line should lie in a specific order of magnitude. The lower limit is fixed by the practical requirements for the throttle device and amounts to k1 > 0. On the other hand, with growing rise, also the sensitivity of the regulating instrument increases.
This sensitivity must, for production-technology reasons, be kept small. From this there emerges the requirement that k1 should be < 5. It is particularly meaningful to strive for a coefficient of resistance t with the flap fully open of < 5 and a rise of the straight line of 0.5'k1'1.5. These goals can be achieved with the device in accordance with the application.
Since the definition of the thus linearised characteristic of resistance intersects the original exponential characteristic of resistance with a flap angle of fG, the curved dishes are so arranged that they are no longer effective at an angle of + > +G and therefore the linear characteristic of resistance at (b = fG merges into the exponential function course. This naturally means a restriction of the regulating range to angles 0 S+C+G. A limiting angle fG of 55 0/01,175 o/o of the flap closing angle +0 is meaningful.
In accordance with a development of the invention, associated with one flap edge are two indentically-designed shells which are arranged in mirror-inverted manner relative to one another.
Finally, a development of the invention additionally provides for the fact that associated with the two edges of the flap, which is mounted for rotation about a central axis, are in each case two shells which are curved in a quarter-circle-shaped configuration.
One exemplified embodiment of the device in accordance with the invention, having a flap mounted for rotation about a central axis, is illustrated in the accompanying diagrammatic drawings, in which:
Figure 1 is a perspective view illustrating a preferred embodiment of the device of the invention:
Figure 2 is a diagrammatic view showing the flap, with its two shells, of the device of
Fig. 1 in elevation;
Figure 3 is a diagrammatic section taken along the line ll-ll of Fig. 1;
Figure 4 shows one of the shells on a scale enlarged as compared with Figs. 2 and 3; and
Figure 5 shows one curve each for the coefficient of resistance as a function of the flap angle f of a conventional throttle device and a throttle device in accordance with the invention.
In Figs. 1 to 3, a throttle device comprises a flap 3 mounted for rotation in a housing 1 on a central axle 2.
Arranged along a path, described by edges 4 of the flap 3, in the housing 1, are shells or
baffles 5, the radius of curvature of which is
adapted to the paths of movement of the
edges 4.
The shells 5 each have a parabolic bulge 6 which extends in such a way that a diminution in cross-section, brought about by the flap 3, upon enlargement of the flap angle f is superimposed by the angle-dependent re
duction in cross-section by virtue of the shells
5.
As shown by Fig. 4, there emerges, by
reason of this superimposition, a coefficient of
resistance t with a linear characteristic (broken
line) as compared with a conventional throttle
device which has a pronounced exponential
course (solid curve).
Claims (4)
1. A device for throttling a media flow by
means of a flap which is mounted swingably
or rotatably in a housing through which the
media flows, characterised in that provided fixedly in the housing is at least one shell or
baffle which is curved in circular-segment configuration and the radius of curvature of which
extends along a path described by one edge
of the flap, in which the shell has, in the
direction of its width, a parabolic bulge which
varies the free cross-section of flow as a function of the respective throttle angle + of the flap.
2. A device as claimed in claim 1, characterised in that associated with one flap edge
are two identically-designed shells which are
arranged in mirror-inverted manner relative to one another.
3. A device as claimed in claim 1 or 2,
characterised in that associated with the two edges of the flap, which is mounted for rotation about a central axis are in each case two shells which are curved in a quarter-circleshaped configuration.
4. A device for throttling a media flow substantially as hereinbefore described with
reference to and as illustrated in the accom
panying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19823219296 DE3219296A1 (en) | 1982-05-22 | 1982-05-22 | DEVICE FOR THROTTLING A MEDIA FLOW |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8310162D0 GB8310162D0 (en) | 1983-05-18 |
GB2120755A true GB2120755A (en) | 1983-12-07 |
GB2120755B GB2120755B (en) | 1985-05-22 |
Family
ID=6164263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08310162A Expired GB2120755B (en) | 1982-05-22 | 1983-04-14 | A device for throttling a media flow |
Country Status (5)
Country | Link |
---|---|
CH (1) | CH663645A5 (en) |
DE (1) | DE3219296A1 (en) |
GB (1) | GB2120755B (en) |
IT (1) | IT1163390B (en) |
NL (1) | NL8301005A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2720134A1 (en) * | 1994-05-18 | 1995-11-24 | Georges Ollier | Fluid pressure valve for piping |
WO2003031856A1 (en) * | 2001-10-05 | 2003-04-17 | Dayco Europe S.R.L. | Flow control device for fluids |
FR2833061A1 (en) * | 2001-12-05 | 2003-06-06 | Mark Iv Systemes Moteurs Sa | DEVICE FOR REGULATING THE FLOW IN A DUCT PORTION OR THE LIKE |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1299235A (en) * | 1970-04-13 | 1972-12-13 | Eaton Yale & Towne | Improvements in or relating to butterfly valves |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1286254A (en) * | 1968-09-11 | 1972-08-23 | Parsons C A & Co Ltd | Improvements in and relating to valves for controlling fluid flow |
-
1982
- 1982-05-22 DE DE19823219296 patent/DE3219296A1/en active Granted
-
1983
- 1983-03-21 NL NL8301005A patent/NL8301005A/en not_active Application Discontinuation
- 1983-04-14 GB GB08310162A patent/GB2120755B/en not_active Expired
- 1983-05-17 CH CH2676/83A patent/CH663645A5/en not_active IP Right Cessation
- 1983-05-20 IT IT21195/83A patent/IT1163390B/en active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1299235A (en) * | 1970-04-13 | 1972-12-13 | Eaton Yale & Towne | Improvements in or relating to butterfly valves |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2720134A1 (en) * | 1994-05-18 | 1995-11-24 | Georges Ollier | Fluid pressure valve for piping |
WO2003031856A1 (en) * | 2001-10-05 | 2003-04-17 | Dayco Europe S.R.L. | Flow control device for fluids |
FR2833061A1 (en) * | 2001-12-05 | 2003-06-06 | Mark Iv Systemes Moteurs Sa | DEVICE FOR REGULATING THE FLOW IN A DUCT PORTION OR THE LIKE |
WO2003048615A1 (en) * | 2001-12-05 | 2003-06-12 | Mark IV Systemes Moteurs (Société Anonyme) | Control device for the throughput in a conduit portion or similar |
US7185878B2 (en) | 2001-12-05 | 2007-03-06 | Mark IV Systemes Moteurs (Société Anonyme) | Control device for the throughput in a conduit portion or similar |
Also Published As
Publication number | Publication date |
---|---|
NL8301005A (en) | 1983-12-16 |
GB8310162D0 (en) | 1983-05-18 |
DE3219296A1 (en) | 1983-11-24 |
CH663645A5 (en) | 1987-12-31 |
IT1163390B (en) | 1987-04-08 |
DE3219296C2 (en) | 1987-07-30 |
GB2120755B (en) | 1985-05-22 |
IT8321195A0 (en) | 1983-05-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |