WO1979001160A1 - Hot gas diverter valve - Google Patents

Hot gas diverter valve Download PDF

Info

Publication number
WO1979001160A1
WO1979001160A1 PCT/GB1979/000088 GB7900088W WO7901160A1 WO 1979001160 A1 WO1979001160 A1 WO 1979001160A1 GB 7900088 W GB7900088 W GB 7900088W WO 7901160 A1 WO7901160 A1 WO 7901160A1
Authority
WO
WIPO (PCT)
Prior art keywords
duct
diverter
axis
hot gas
outlet
Prior art date
Application number
PCT/GB1979/000088
Other languages
French (fr)
Inventor
M Heath
R Hall
B Monk
Original Assignee
British Aerospace
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 British Aerospace filed Critical British Aerospace
Publication of WO1979001160A1 publication Critical patent/WO1979001160A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C3/00—Circuit elements having moving parts
    • F15C3/10—Circuit elements having moving parts using nozzles or jet pipes
    • F15C3/12—Circuit elements having moving parts using nozzles or jet pipes the nozzle or jet pipe being movable

Definitions

  • This invention relates to valves for the diversion of a hot gas flow from a single duct selectively and/or proportionally to a plurality of ducts.
  • Such valves may typically be used in a flight vehicle where hot gas from a source (for example the burning propellant of a propulsion engine) is used to power an actuator (for example in the vehicle control system).
  • a source for example the burning propellant of a propulsion engine
  • an actuator for example in the vehicle control system
  • valves are liable to become clogged or damaged by the deposition of contaminents that occur in the hot gas, they are liable to be damaged by the high temperatures involved; and they are liable to sealing problems.
  • the present invention has for an objective a valve in which the incidence of problems due to these liabilities is at least reduced.
  • a hot gas diverter valve includes a delivery duct with an outlet for directing a hot gas flow along a first axis, a diverter duct with an inlet for accepting hot gas flow from the outlet of the delivery duct and an outlet for directing flow either along the first axis or to either side thereof, a plurality of receiver ducts having inlets positioned to receive flow from the outlet of the diverter duct, and pivot means positioned to allow pivoting of the diverter duct about a second axis transverse to the first axis in the region of the inlet to the diverter duct.
  • the second axis is normal to the first axis and is coincident with or just upstream of said inlet.
  • the diverter duct is pivoted and carried by motor driven drive shaft means.
  • Figure 2 is a side view of a preferred valve being partly sectioned upon line II-II of figure 3,
  • Figure 3 is a plan view of the preferred valve being partly sectioned upon line III-III of Figure 2 , and,
  • Figure 4 is an end view.
  • fluid is ducted from a source (not shown) , along a delivery duct 1.
  • This delivery duct is in flow communication with diverter duct 2 having an outlet 3.
  • the outlet 3 is shifted laterally to either side of a central axis X-X by means of a motor 4, a region of the diverter duct 2 being flexible to allow such shifting.
  • the outlet 3 discharges into twin inlets 5 and 6, receiver ducts 7 and 8, respectively, angularly situated on each side of the axis X-X.
  • the fluid flow is shared between the ducts 7 and 8 and when shifted under the action of the motor 4 is progressively proportional until the situation is such that the full flow is directed selectively to the duct 7 or the duct 8.
  • the ducts 7 and 8 are in flow communication with piston/cylinder arrangements 9 and 10, respectively, the pistons of which are coupled to a pivoting beam 11. Differential movement of the pistons under the action of the fluid flow effects rotation of the beam 11 and hence actuation of control apparatus, not shown.
  • the flexible region of the diverter duct can be replaced with a knuckle joint.
  • both the flexible region and the knuckle joint arrangements have disadvantages in practice when the fluid is a hot gas, for example that derived from the solid propellant charge of a rocket motor. Since the gas flow is at high temperature a truly flexible region is liable to melt, whilst, if made of a heat resistant material it is found to be insufficiently flexible to give accurate and rapid flexing under the action of the motor. Similarly, a knuckle joint arrangement which requires seals between the moving portions of knuckle is found to be susceptible to seal failure.
  • a diverter valve according to the invention is illustrated as an assembly including a piston/cylinder arrangement in the form of a double acting piston rather than the twin piston arrangement of Figure 1; it accordingly does not include the beam 11.
  • the piston/cylinder arrangement do not form part of the invention.
  • valve itself has a body portion 12 with a cylindrical bore 13 formed along an axis referenced X-X. Inserted into this bore from the right hand end, as drawn, is a delivery duct member 14, and from the left hand end, as drawn, is a receiver duct member 15. Both members are electron beam welded into position leaving a chamber 16 in between.
  • the delivery duct member 14 has a delivery duct 17 formed through it with an outlet 18 lying in a plane normal to the axis X-X. Both the duct 17 and the outlet 18 lie upon the axis X-X.
  • the duct 17 accepts hot gas from a source, not shown.
  • the receiver duct member 15 has receiver ducts 19 and 20 which are symmetrically disposed in a lateral plane with respect to the axis X-X and are angled from it.
  • the ducts respectively have inlets 21 and 22 which abut on the axis X-X and lie in a common plane normal to that axis.
  • the ducts 19 and 20 are in flow connection with opposed sides of a piston 23, shown in broken outline in Figures 3 and 4, housed in a cylinder block 24 carried upon a protruding portion of the receiver duct member 15.
  • the piston is carried upon an actuator rod 23a.
  • a diverter duct member 25 This is carried upon a shaft 26 which is rotatable about an axis Y-Y lying normal to and coincident with the axis X-X.
  • the shaft 26 is carried and driven by a motor 27 which is itself carried upon the body portion 12.
  • That part of the diverter duct member 25 lying between the outlet 18 and the inlets 21 and 22 (that is to say, in the chamber 16) is of cylindrical form with the major axis of the cylinder lying parallel to the Y-Y axis, that is to say offset from it in a generally downstream direction.
  • a diverter duct 28 Extending through this cylindrical portion and concentric with the axis X-X when in an undisturbed state is a diverter duct 28 which has an inlet 29 arranged to receive gas flow from the outlet 18 and an outlet 30 arranged to deliver gas flow to the inlets 21 and 22.
  • the radius of the cylindrical portion is chosen so as to position the inlet 29 substantially in the region of the Y-Y axis. Preferably, as drawn, it lies on the Y-Y axis and the outlet 18 is slightly spaced upstream from the surface of the cylinder. Similarly, the inlets 21 and 22 are slightly spaced downstream from the surface of the cylinder.
  • the outlet 18 is of similar diameter to the inlet 29 and the outlet 28 is of similar diameter to the inlet 29 but is smaller than the diameters of the inlets 21 and 22.
  • Exhaust gas flow is through the chamber 16 and an exhaust duct 31.
  • the described arrangement has advantage in that the diverter duct member 25 can be rotated without the friction associated with closely contacting components, there is found to be only small gas flow loss due to clearances since the inlet 29 always remains close to the outlet 18, and gas through flow and contaminent deposition tolerance is aided by use of induced flow from the exhaust gas in the chamber 16; it is found that the cylindrical shape of the diverter duct member 25 helps in this latter respect.
  • those surfaces in contact with the hot gases may be treated with, for example, a borided alloy of titanium, zirconium, and molybdenum.

Abstract

A hot gas diverter valve has a delivery duct (17) for directing a hot gas flow along a first axis (X-X), a diverter duct (28) with an inlet (29) for accepting hot gas flow and directing it to either side of the axis (X-X) two receiver ducts (19, 20) angularly situated one on each side of the axis (X-X) to receive flow proportionally or selectively from the diverter duct (28), the diverter duct (28) being pivoted about a second axis (Y-Y) which lies both normal to the first axis (X-X) and coincident with the inlet (29).

Description

Title: Hot Gas Diverter Valve.
This invention relates to valves for the diversion of a hot gas flow from a single duct selectively and/or proportionally to a plurality of ducts.
Such valves may typically be used in a flight vehicle where hot gas from a source (for example the burning propellant of a propulsion engine) is used to power an actuator (for example in the vehicle control system).
In such and similar embodiments the valves are liable to become clogged or damaged by the deposition of contaminents that occur in the hot gas, they are liable to be damaged by the high temperatures involved; and they are liable to sealing problems.
The present invention has for an objective a valve in which the incidence of problems due to these liabilities is at least reduced.
According to the present invention a hot gas diverter valve includes a delivery duct with an outlet for directing a hot gas flow along a first axis, a diverter duct with an inlet for accepting hot gas flow from the outlet of the delivery duct and an outlet for directing flow either along the first axis or to either side thereof, a plurality of receiver ducts having inlets positioned to receive flow from the outlet of the diverter duct, and pivot means positioned to allow pivoting of the diverter duct about a second axis transverse to the first axis in the region of the inlet to the diverter duct.
Preferably the second axis is normal to the first axis and is coincident with or just upstream of said inlet.
Preferably the diverter duct is pivoted and carried by motor driven drive shaft means.
A preferred embodiment of a valve according to the invention is described with reference to the accompanying drawings in which:- Figure 1 is a diagram of a known diverter valve installation
Figure 2 is a side view of a preferred valve being partly sectioned upon line II-II of figure 3,
Figure 3 is a plan view of the preferred valve being partly sectioned upon line III-III of Figure 2 , and,
Figure 4 is an end view.
Referring initially to Figure 1 fluid is ducted from a source (not shown) , along a delivery duct 1. This delivery duct is in flow communication with diverter duct 2 having an outlet 3. The outlet 3 is shifted laterally to either side of a central axis X-X by means of a motor 4, a region of the diverter duct 2 being flexible to allow such shifting.
The outlet 3 discharges into twin inlets 5 and 6, receiver ducts 7 and 8, respectively, angularly situated on each side of the axis X-X. Naturally, when the outlet of the diverter duct lies on the X-X axis the fluid flow is shared between the ducts 7 and 8 and when shifted under the action of the motor 4 is progressively proportional until the situation is such that the full flow is directed selectively to the duct 7 or the duct 8.
The ducts 7 and 8 are in flow communication with piston/cylinder arrangements 9 and 10, respectively, the pistons of which are coupled to a pivoting beam 11. Differential movement of the pistons under the action of the fluid flow effects rotation of the beam 11 and hence actuation of control apparatus, not shown.
The flexible region of the diverter duct can be replaced with a knuckle joint.
It has been found that both the flexible region and the knuckle joint arrangements have disadvantages in practice when the fluid is a hot gas, for example that derived from the solid propellant charge of a rocket motor. Since the gas flow is at high temperature a truly flexible region is liable to melt, whilst, if made of a heat resistant material it is found to be insufficiently flexible to give accurate and rapid flexing under the action of the motor. Similarly, a knuckle joint arrangement which requires seals between the moving portions of knuckle is found to be susceptible to seal failure.
Referring now to Figures 2, 3 and 4, a diverter valve according to the invention is illustrated as an assembly including a piston/cylinder arrangement in the form of a double acting piston rather than the twin piston arrangement of Figure 1; it accordingly does not include the beam 11. The piston/cylinder arrangement do not form part of the invention.
In the Figures the valve itself has a body portion 12 with a cylindrical bore 13 formed along an axis referenced X-X. Inserted into this bore from the right hand end, as drawn, is a delivery duct member 14, and from the left hand end, as drawn, is a receiver duct member 15. Both members are electron beam welded into position leaving a chamber 16 in between.
The delivery duct member 14 has a delivery duct 17 formed through it with an outlet 18 lying in a plane normal to the axis X-X. Both the duct 17 and the outlet 18 lie upon the axis X-X. The duct 17 accepts hot gas from a source, not shown.
The receiver duct member 15 has receiver ducts 19 and 20 which are symmetrically disposed in a lateral plane with respect to the axis X-X and are angled from it. The ducts respectively have inlets 21 and 22 which abut on the axis X-X and lie in a common plane normal to that axis.
The ducts 19 and 20 are in flow connection with opposed sides of a piston 23, shown in broken outline in Figures 3 and 4, housed in a cylinder block 24 carried upon a protruding portion of the receiver duct member 15. The piston is carried upon an actuator rod 23a.
Between the member 14 and the member 15 lies a diverter duct member 25. This is carried upon a shaft 26 which is rotatable about an axis Y-Y lying normal to and coincident with the axis X-X. The shaft 26 is carried and driven by a motor 27 which is itself carried upon the body portion 12.
That part of the diverter duct member 25 lying between the outlet 18 and the inlets 21 and 22 (that is to say, in the chamber 16) is of cylindrical form with the major axis of the cylinder lying parallel to the Y-Y axis, that is to say offset from it in a generally downstream direction. Extending through this cylindrical portion and concentric with the axis X-X when in an undisturbed state is a diverter duct 28 which has an inlet 29 arranged to receive gas flow from the outlet 18 and an outlet 30 arranged to deliver gas flow to the inlets 21 and 22.
The radius of the cylindrical portion is chosen so as to position the inlet 29 substantially in the region of the Y-Y axis. Preferably, as drawn, it lies on the Y-Y axis and the outlet 18 is slightly spaced upstream from the surface of the cylinder. Similarly, the inlets 21 and 22 are slightly spaced downstream from the surface of the cylinder.
As shown, the outlet 18 is of similar diameter to the inlet 29 and the outlet 28 is of similar diameter to the inlet 29 but is smaller than the diameters of the inlets 21 and 22.
Exhaust gas flow is through the chamber 16 and an exhaust duct 31. The described arrangement has advantage in that the diverter duct member 25 can be rotated without the friction associated with closely contacting components, there is found to be only small gas flow loss due to clearances since the inlet 29 always remains close to the outlet 18, and gas through flow and contaminent deposition tolerance is aided by use of induced flow from the exhaust gas in the chamber 16; it is found that the cylindrical shape of the diverter duct member 25 helps in this latter respect.
To reduce ablation those surfaces in contact with the hot gases may be treated with, for example, a borided alloy of titanium, zirconium, and molybdenum.

Claims

What we claim is : -
1. A hot gas diverter valve including a delivery duct with an outlet for delivering a hot gas flow along a first axis, a diverter duct with an inlet for accepting hot gas flow from the outlet of the delivery duct and an outlet for directing flow either along the first axis or to either side thereof, a plurality of receiver ducts having inlets positioned to receive flow from the outlet of the diverter duct, and pivot means positioned to allow pivoting of the diverter duct about a second axis transverse to the first axis in the region of the inlet to the diverter duct.
2. A hot gas diverter valve according to claim 1 wherein the second axis is normal to the first axis and lies coincident with the inlet to the diverter duct.
3. A hot gas diverter valve according to claim 1 or claim 2 wherein the diverter duct is pivoted and carried by motor driven drive shaft means.
4. A hot gas diverter valve according to any one of the previous claims wherein the diverter duct is formed in a cylindrical diverter duct member the major axis of the cylinder lying parallel to and downstream of the second axis.
5. A hot gas diverter valve according to claim 4 wherein the second axis is coincident with the cylindrical surface of the diverter duct member.
6. A hot gas diverter valve according to claims 4 or 5 wherein the outlet of the delivery duct and the inlets of the receiver ducts are close to but do not touch the cylindrical surface of the diverter duct member.
7. A hot gas diverter valve according to any one of the previous claims wherein the outlet of the delivery duct, the inlet and the outlet of the diverter duct are of similar diameter, but the inlets of the receiver ducts are of a larger diameter.
8. A hot gas diverter valve substantially as described with reference to Figures 2, 3 and 4 of the accompanying Figures.
PCT/GB1979/000088 1978-05-31 1979-05-30 Hot gas diverter valve WO1979001160A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB25720/78 1978-05-31
GB2572078 1978-05-31

Publications (1)

Publication Number Publication Date
WO1979001160A1 true WO1979001160A1 (en) 1979-12-27

Family

ID=10232198

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1979/000088 WO1979001160A1 (en) 1978-05-31 1979-05-30 Hot gas diverter valve

Country Status (2)

Country Link
EP (1) EP0016019A1 (en)
WO (1) WO1979001160A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638790A1 (en) * 1988-11-10 1990-05-11 Messerschmitt Boelkow Blohm ROTATING BODY FLUID DISPENSER
EP0425113A1 (en) * 1989-10-21 1991-05-02 Normalair-Garrett (Holdings) Limited Fluid compressors

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2896654A (en) * 1958-08-11 1959-07-28 Olaf A Guzmann Torsionally mounted jet pipe relay
US2960995A (en) * 1956-05-01 1960-11-22 North American Mfg Jet pipe relay for operation submerged in oil with minimum inertia and frictional resistance
US3081787A (en) * 1961-07-13 1963-03-19 Pneumo Dynamics Corp Hydraulic control valve
US3155019A (en) * 1960-05-06 1964-11-03 Thompson Ramo Wooldridge Inc Hot gas servo system having rotary actuator
FR2131865A1 (en) * 1971-03-31 1972-11-17 Renault
FR2153163A2 (en) * 1971-09-22 1973-05-04 Renault

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960995A (en) * 1956-05-01 1960-11-22 North American Mfg Jet pipe relay for operation submerged in oil with minimum inertia and frictional resistance
US2896654A (en) * 1958-08-11 1959-07-28 Olaf A Guzmann Torsionally mounted jet pipe relay
US3155019A (en) * 1960-05-06 1964-11-03 Thompson Ramo Wooldridge Inc Hot gas servo system having rotary actuator
US3081787A (en) * 1961-07-13 1963-03-19 Pneumo Dynamics Corp Hydraulic control valve
FR2131865A1 (en) * 1971-03-31 1972-11-17 Renault
FR2153163A2 (en) * 1971-09-22 1973-05-04 Renault

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638790A1 (en) * 1988-11-10 1990-05-11 Messerschmitt Boelkow Blohm ROTATING BODY FLUID DISPENSER
EP0425113A1 (en) * 1989-10-21 1991-05-02 Normalair-Garrett (Holdings) Limited Fluid compressors

Also Published As

Publication number Publication date
EP0016019A1 (en) 1980-10-01

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