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
  • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
  • F15B15/20—Other details, e.g. assembly with regulating devices
  • F15B15/28—Means for indicating the position, e.g. end of stroke
  • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
  • F15B15/2838—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT with out using position sensors, e.g. by volume flow measurement or pump speed

Definitions

• a position indicator for a hydraulic type setting motor is provided.
• the invention relates to a hydraulically oper ⁇ ating position indicator for remote indication of the position of the movable member in a double-acting, fluid-pressurized hydraulic setting motor having the same stroke volume in both directions and being con ⁇ nected with two control conduits for the supply and removal of pressure fluid to actuate the movable mem ⁇ ber for movement in an opening direction or in a closing direction, the position indication being per- formed by a volumeter positioned remote from the setting motor and having a measuring volume corres ⁇ ponding to the stroke volume of the setting motor.
• a hydralically operating posi- tion indicator of the above type is characterized in that in one and the other of two operating positions corresponding to opening and closing, respectively, the two control conduits may be connected over a multi-way valve with a pressure con- duit and a tank conduit or, in a neutral state both of them may be connected with the tank conduit in a free flow communication therewith, the volumeter being coupled to said multi-way valve in such a manner that in both operating positions the volumeter is connected into the control conduit connected with the tank con ⁇ duit, means being provided for firmly retaining the volumeter in its latest occupied position in said neutal state, and the two control conduits being con ⁇ nected with the working chamber of the setting motor on either side of the movable element member over pilot controlled non-return valve arrangements which in the neutral state prevent pressure fluid from passing from the setting motor to the control conduits which are unpressurized in this position, whereas each of these non-return valve arrangements in the operating position in which the control conduit associated with the other
• the retainment of the volumeter in the indicator position may advantageously be obtained by a connection with said multi-way valve such that in the neutral state the volumeter is disconnected from both control conduits.
• throttle valve arrangements causing some time delay of the disconnection may be associated with said multi-way valve to which the volumeter is connected. Due to the elimination of the above mentioned indication error the invention offers an advantageous possibility of positioning the pilot operated non ⁇ return valve arrangements in the vicinity of the setting motor so that the retainment of the setting motor and thus of a valve operated by it, may be effected immediately at the setting motor and the valve, thereby fulfilling the demands increasingly made by classification societies.
• Figs 1 to 3 are charts of a hydraulic setting motor with remote indication by means of an embodiment of a position indicator according to the invention, upon activation of the setting motor in the closing direction, in the neutral condition and upon activation of the setting motor in the opening direction, respect ⁇ ively, and
• Figs 4 to 6 corresponding charts of a second embodiment.
• a setting motor 6 with a working piston 7 is connect ⁇ ed through control conduits A 2 and B 2 connected with a six-way valve 2 over which the conduits lines A 2 and ⁇ >2 ⁇ ay be connected with control strings A- j _ and B 1 which by means of a solenoid-controlled three-way operating valve l may be coupled to a pressure con ⁇ duit P, and a tank conduit T.
• the three-way valve 1 In the rest position shown in Fig. 2 the three-way valve 1 is de-energized and brought into a centre-position by springs, not shown.
• control strings A- j _ and B- j _ are connected with the tank conduit T, thereby likewise causing the six-way valve 2 to occupy a centre position by bias stress from springs 11 and 12 therein, so that also the control conduits 2 and B 2 are unpressurized.
• the volumeter 3 is locked in its position in this condition by barring the oil inlets, but such a retainment may also be obtained in another way, e.g. by means of a mechanical locking device which is activated when the control strings by the change-over of the valve l to the neutral con ⁇ dition become unpressurized or assume a very low pressure.
• the valve 2 may thus be a four-way valve instead of the illustrated six-way valve.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Analytical Chemistry (AREA)
• Fluid Mechanics (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Fluid-Pressure Circuits (AREA)
• Mobile Radio Communication Systems (AREA)
• High-Pressure Fuel Injection Pump Control (AREA)
• Actuator (AREA)
• Valve-Gear Or Valve Arrangements (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)
• Valve Device For Special Equipments (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8097495

Family Applications (1)

Country Status (8)

Cited By (5)

Families Citing this family (2)

Citations (2)

• 1991
  • 1991-04-29 DK DK91782A patent/DK78291D0/da not_active Application Discontinuation
• 1992
  • 1992-04-27 EP EP92910183A patent/EP0605425B1/en not_active Revoked
  • 1992-04-27 DE DE69204072T patent/DE69204072D1/de not_active Expired - Lifetime
  • 1992-04-27 AT AT92910183T patent/ATE126326T1/de not_active IP Right Cessation
  • 1992-04-27 JP JP4509149A patent/JPH06507467A/ja active Pending
  • 1992-04-27 WO PCT/DK1992/000133 patent/WO1992019871A1/en not_active Application Discontinuation
• 1993
  • 1993-10-14 NO NO933698A patent/NO933698L/no unknown
  • 1993-10-28 FI FI934776A patent/FI934776A0/fi not_active Application Discontinuation

Patent Citations (2)

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