EP0140668B1 - Proportioners - Google Patents

Proportioners Download PDF

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Publication number
EP0140668B1
EP0140668B1 EP19840307258 EP84307258A EP0140668B1 EP 0140668 B1 EP0140668 B1 EP 0140668B1 EP 19840307258 EP19840307258 EP 19840307258 EP 84307258 A EP84307258 A EP 84307258A EP 0140668 B1 EP0140668 B1 EP 0140668B1
Authority
EP
European Patent Office
Prior art keywords
valve
stepper motor
shaft
casing
pressure
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.)
Expired
Application number
EP19840307258
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0140668A3 (en
EP0140668A2 (en
Inventor
Arthur Kaye
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems PLC
Original Assignee
British Aerospace PLC
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 PLC filed Critical British Aerospace PLC
Publication of EP0140668A2 publication Critical patent/EP0140668A2/en
Publication of EP0140668A3 publication Critical patent/EP0140668A3/en
Application granted granted Critical
Publication of EP0140668B1 publication Critical patent/EP0140668B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/022—Flow-dividers; Priority valves

Definitions

  • This invention relates to proportioners suitable for use in hydraulic circuits.
  • Proportioners such as that described in US-A-2,466,485, may be used in hydraulic circuits to provide the symmetrical deployment of components controlled by such circuits.
  • certain fail-safe conditions must be satisfied ie the symmetrical deployment of the airbraking surfaces, and thus the constituing of a proportioner may be desirable if not essential.
  • proportioners have relied only on differential hydraulic pressures or flows, they have proved somewhat imprecise.
  • proportioning means for connection to a source of fluid pressure and to separate actuators which require to be synchronously moved, including in combination, casing means having twin fluid flow path means each having an inlet for connection to said source and an outlet for connection one of said actuators, fluid flow throttling means, and pressure-sensitive piston-cylinder means, the proportioning means further including stepper motor means having stator means and shaft means, the stator means being carried by said casing means and the shaft means lying within said casing means to actuate said fluid flow throttling means, whereby stepping of the stepper motor in response to variations in flow to the actuators effects a decrease or increase of flow in order to effect synchronisation of the actuators, and on failure of the stepper motor, any pressure differential within said pressure-sensitive piston-cylinder means causes said shaft means to actuate said flow throttling means to effect synchronisation of the actuators.
  • the stepper motor is reciprocatory and the fluid flow throttling means comprise valve surfaces formed upon spaced ends of the casing means and between which is carried said stator means of the stepper motor, the fluid flow throttling means further comprising opposed valve members carried at the remote ends of the shaft means of the stepper motor, each valve member being operable to mate with its associated valve surface to open and close the valve thereformed, so that when one valve is substantially fully opened, the opposed valve is substantially closed.
  • valve members and valve surfaces may be of conical shape, the valve members having bleed flutes formed on the conical surface.
  • Each pressure-sensitive piston-cylinder means may be formed by an end portion of the casing means and each pistion may be formed by an end portion of the shaft means, the two being sealed by sealing means provided.
  • the casing means, the stepper motor means, the pressure-sensitive piston-cylinder means and the fluid flow throttling means are arranged to be coaxially aligned.
  • Figure 1 shows a sectional side elevation of a proportioner
  • Figure 2 show a schematic block diagram of an airbraking system as fitted to an aircraft incorporating the proportioner.
  • a proportioner as shown in figure 1, comprises a casing 1 in which are formed a pair of inlet ports 2a, 2b and a pair of outlet ports 3a, 3b.
  • a linear stepper motor 5 of annular form is mounted rigidly in the casing 1.
  • a shaft 4 having an axis X-X passes through the annulus of the motor 5 and is carried on a pair of phosphor-bronze bush bearings 6a, 6b for reciprocatory movement along its axis.
  • the stepper motor 5 consists of two toroidal phase windings 5a, 5b and a samarium cobalt permanent magnet 5c.
  • the shaft 4 has a portion 4e in its centre which is adapted so that the shaft can be "stepped" to the right or left along its axis X-X by the motor 5.
  • the outlet ports 3b, 3b are located at the ends of the casing coaxially with X-X. Adjacent the ports 3a, 3b, on the interior of the casing 1, are provided conical valve surfaces 1a, 1b respectively.
  • a conical valve member 4a, 4b having a fluid bleed flute 4f, 4g, which can mate with the surfaces 1a, 1b.
  • the relative positions of surfaces 1a, 16 and members 4a, 4b respectively control the flow of fluid through the outlet ports 3a, 3b.
  • Flanges 4c, 4d are formed on the shaft 4 to form two separate hydraulic fluid cylinders 8a, 8b. '0' ring seals 7a, 7b prevent the flow of fluid between the flanges 4c, 4d and the casing 1, but they allow the shaft 4 to move relative to the casing 1 when the stepper motor 5 is operated.
  • the proportioner forms part of a system as shown in figure 2.
  • a pump 9 pumps hydraulic fluid into the proportioner 10 from a fluid reservoir (not shown).
  • the inlet pressures at the inlet ports 2a, 2b are equal.
  • the fluid flows through the proportioner 10 and is fed to meters 11 and 12 via the outlet ports 3a, 3b.
  • the meters 11, 12 measure the flowrate from each half of the proportioner 10 as the fluid passes through them to airbrake jacks (not shown).
  • Signals representing the measured flowrates are sampled at intervals by a comparator/controller 13 and the signals are compared. If one signal is greater than the other, the comparator/controller 13 then signals the proportioner 10, indicating to the motor 5 which way it should "step" to correct the imbalance present in the system.
  • the comparator/controller 13 would signal the proportioner 10, indicating to it that the motor 5 should "step” the shaft 4 to the right ie bringing the valve surface 1b and valve member 4b closer together and the moving valve surface 1a and valve member 4a further apart to respectively decrease and increase the flow.
  • the shaft 4 would be "stepped" to the left. The next time the signals from the meters 11, 12 are sampled, the procedure is repeated. This may be carried out several times until the two flowrates are balanced. Sampling may be carried out every 40 ms- the motor 5 can "step" the shaft 4 in increments of 0.635 mm (0.025 in) giving a range of possible outlet flowrates determined by the physical size of the proportioner.
  • the proportioner would then act to balance the pressures in the two hydraulic cylinders 8a, 8b. For example, if the motor 5 failed as the airbrakes were being applied and, say, the left airbrake jack was the more deployed ie there was a greater flowrate through cylinder 8a than through cylinder 8b, then the pressure in the left hydraulic cylinder 8a of the proportioner would be less than the pressure in the right hydraulic cylinder 8b. The greater pressure in cylinder 8b would then cause the shaft 4 to move towards the left, tending to close the off port 3a and open port 3b until the pressures in both cylinder 8a, 8b were balanced, thus producing equal deployment of the airbrakes.
  • the motor 5 fails as the airbrakes are being retracted with, say, the left airbrake retracted to a greater extent than the right airbrake, then the greater pressure in the right airbrake jack due to the action of the surrounding air on the airbrake surface would cause the shaft 4 to move to the left tending to close off port 3a and open port 3b, thus producing a greater flowrate through the right hydraulic cylinder 8b, until the pressures are balanced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
EP19840307258 1983-11-01 1984-10-22 Proportioners Expired EP0140668B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8329175 1983-11-01
GB838329175A GB8329175D0 (en) 1983-11-01 1983-11-01 Proportioners

Publications (3)

Publication Number Publication Date
EP0140668A2 EP0140668A2 (en) 1985-05-08
EP0140668A3 EP0140668A3 (en) 1985-06-12
EP0140668B1 true EP0140668B1 (en) 1987-09-23

Family

ID=10551062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840307258 Expired EP0140668B1 (en) 1983-11-01 1984-10-22 Proportioners

Country Status (4)

Country Link
EP (1) EP0140668B1 (es)
DE (1) DE3466425D1 (es)
ES (1) ES537264A0 (es)
GB (1) GB8329175D0 (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8629750D0 (en) * 1986-12-12 1987-01-21 British Aerospace Electro-hydraulic actuator assembly
GB2201234B (en) * 1987-02-19 1990-03-28 Moog Inc Ejector release unit and fluid flow dividing valve for the unit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2466485A (en) * 1944-03-11 1949-04-05 Bendix Aviat Corp Valve
FR2373093A1 (fr) * 1976-12-03 1978-06-30 United Kingdom Government Appareil destine a debiter un melange de gaz sous pression
US4393319A (en) * 1980-12-08 1983-07-12 General Motors Corporation Electric motor powered actuator
FR2541391B1 (fr) * 1983-02-17 1987-08-07 Outillage Air Comprime Dispositif de distribution hydraulique proportionnelle et application a un distributeur hydraulique, a un limiteur de pression, a un regulateur de debit et a une machine hydraulique

Also Published As

Publication number Publication date
ES8600468A1 (es) 1985-09-16
ES537264A0 (es) 1985-09-16
EP0140668A3 (en) 1985-06-12
EP0140668A2 (en) 1985-05-08
GB8329175D0 (en) 1983-12-07
DE3466425D1 (de) 1987-10-29

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