Abstract:
PURPOSE: To detect the position of a floating piston in a pressure accumulator from a remote place with high accuracy by projecting a sound wave from a vibrating detecting contact disposed on the outer casing of a cylindrical pressure accumulator to the floating piston, thereby to detect a reflection wave from the floating piston. CONSTITUTION: An ultrasonic detecting contact 3 is fixed to the bottom plate 1c of a cylinder of a pressure chamber B filled with operating liquid to project an ultrasonic wave on a floating piston 1d. The projection wave is reflected by the floating piston 1d to be received with the projection wave by a sound wave receiver 4 and displayed on a cathode-ray tube of a display unit 5. When gas in a pressure chamber A leaks, the floating piston 1d is moved upward, so that the sound pressure of a received wave D is lowered. Therefore, a gas leakage is detected from the lowering of the crest of an echo wave of the display unit 5. COPYRIGHT: (C)1984,JPO&Japio
Abstract:
A pressure accumulator includes an accumulator housing having first and second ports for receiving first and second pressure mediums, respectively, a movable separating element subdividing an interior of the accumulator housing into at least first and second working spaces, the first working space accommodating the first pressure medium and the second working space accommodating the second pressure medium, wherein the first port is in fluid communication with the first working space and the second port in fluid communication with the second working space. At least one sensor is operatively coupled to the first working space for measuring at least one characteristic of the first working space, and a gas generator is operative to generate a gas from ambient air, the gas generator including an outlet for outputting the generated gas, the outlet in fluid communication with the first port. A controller is operatively coupled to the at least one sensor and the gas generator, the controller configured to calculate an amount of gas in the first working space based on the at least one characteristic and upon the calculated amount of gas in the first working space being below a first threshold level, generate a command to introduce gas from the gas generator into the first working space.
Abstract:
A laser piston position sensor (26) for determining the position of a piston (28) within an accumulator (20), the laser piston position sensor (26) configured to attach to an end of the accumulator (20), and the accumulator (20) having an aperture (29) in the end thereof exposing the piston (28) within the accumulator (20) to the laser piston position sensor (26), The laser piston position sensor (26) including a sensor housing (46) enclosing a cavity (48) containing a low pressure gas, and defining an opening (68) from the cavity (48) toward the accumulator (20), a laser sensor (70) positioned within the cavity (48) for emitting a laser (72) toward the piston (28) of the accumulator (20) via the opening (68) in the sensor housing (46) and the aperture (29) in the accumulator (20), and a transparent lens (58) positioned between the laser sensor (70) and the accumulator (20) to allow passage of the laser (72) from the laser sensor (70) to the piston (28), and to separate gases in the accumulator (20) from gases in the cavity (48) of the sensor housing (46).
Abstract:
A linear position sensing system includes a sensor, a conduit and an enclosure. The sensor has a connector and a converting element, where the connector includes a first end attached to the converting element and a second end that passes through the conduit and is configured for attachment to a moveable element of an external device. The enclosure houses the sensor. The conduit includes a first end fitting that is attached to the enclosure and a second end fitting that is affixed at a port or other aperture of the external device. The second end of the connector is configured to be inserted in the port other aperture and attached to the moveable element without disassembly of the external device.
Abstract:
The invention relates to a hydraulic accumulator device having a housing (4) which comprises a gas volume (8) and a fluid volume (10). In order to simplify the sensing of the state of charge of hydraulic accumulator devices, an interference signal generator (11) and a measurement signal pickup (12) are provided, which measurement signal pickup (12) detects, in a modified form as a measurement signal, an interference signal which is output by the interference signal generator (11) and propagates in the gas volume (8) or the fluid volume (10) and/or across the housing (4).
Abstract:
The invention relates to a piston accumulator (1) and a method for determining a position of a piston (5) that can be moved inside a housing (3) of the piston accumulator (1). One or more inductive sensors (15) are arranged on an exterior surface (21) of the housing (3) and configured to detect a movement of the piston (5) inside the housing (3) caused by electromagnetic induction. In this way, a determination of the current position of the piston (5), which is technically simple to realise and contact-free, can be implemented and used, for example, to monitor a charge state of the piston pressure accumulator (1).
Abstract:
Es werden ein Kolbenspeicher (1) sowie ein Verfahren zum Bestimmen einer Position eines Kolbens (5), der sich innerhalb eines Gehäuses (3) des Kolbenspeichers (1) bewegen kann, beschrieben. An einer Mantelfläche (21) des Gehäuses (3) sind dabei ein oder mehrere Induktivsensoren (15) außen angeordnet und dazu ausgelegt, eine Bewegung des Kolbens (5) im Innern des Gehäuses (3) aufgrund von elektromagnetischer Induktion zu detektieren. Auf diese Weise kann eine technisch einfach zu realisierende, berührungsfreie Bestimmung der aktuellen Position des Kolbens (5) implementiert werden und beispielsweise zur Überwachung eines Ladezustands des Kolbendruckspeichers (1) benutzt werden.