Abstract:
A system for determining the location of a movable element within a container is provided in which a linear variable differential transformer ("LVDT") is formed with the container and the movable element therein. The LVDT includes a coil assembly including a primary or excitation winding, a secondary or output winding, and a movable element or core that is magnetically permeable. Measurement of an output signals allows for precise determination of the movable element location relative to the container. The system can be utilized to determine fluid volumes in accumulators used for controlling subsea equipment by monitoring the location of a movable element, e.g., a piston, within a hydraulic fluid accumulator.
Abstract:
A gas spring accumulator comprising:- a housing (2, 3) provided with an inlet (20); and - a flexible diaphragm (4) dividing the interior of the housing into a working chamber (7) which is exposed to system pressure via the inlet, and a gas chamber (6); characterised in that the housing includes a diaphragm element (4) having one side exposed to system pressure via the inlet (20) and an opposite side exposed to a further chamber (13), a first non-return valve (17) arranged to admit atmospheric gas into the further chamber (13), and a second non-return valve (29) arranged to admit gas from the further chamber (13) into the gas chamber (6).
Abstract:
Method and device for determining the position of a piston in a cylinder comprising use of both ultrasound transducer and magnetometer for transmitting and receiving signals that are interpreted in a signal processor for determining the position of the piston.
Abstract:
The invention provides a reliable means for measuring the available fluid volume in a hydraulic accumulator. The displaceable part (5) of a piston (4) in an accumulator (1), which separates the fluid volume (2b) from the gas volume (2a), is connected to a wire (6) that runs through the fluid volume and exits to the outside of the accumulator through a sealed opening (9) close to the hydraulic valve (3). From there, the wire is led over pulleys (10, 11) to run trough a longitudinal hollow member (LVDT) that is attached to the accumulator (1), and carries a metallic core member (8), whose position can electrically be monitored between two end points, as a result of the change of the magnetic field produced by electric coils surrounding the trajectory of the core member as known from linear variable differential transformers (LVTD), in order to give an accurate reading of the position of the piston (4), which is a function of the fluid volume present within the accumulator (1).
Abstract:
Die Erfindung betrifft ein elektrohydraulisches Aggregat, insbesondere für schlupfgeregelte Kraftfahrzeugbremsanlagen, mit einer Hydraulikeinheit (2) (HCU) umfassend einen Aufnahmekörper (3) der elektrisch ansteuerbare Ventile sowie eine hydraulische Pumpe aufnimmt, mit einer elektrischen Antriebsvorrichtung (5) für die Pumpe, und mit einem von der Pumpe gespeisten Druckmittelspeicher (4) welcher ein Medientrennelement (17) und eine Sensorvorrichtung (23) mit einem Nehmer (25) zur Stellungsüberwachung des Medientrennelementes (17) aufweist, und mit einer Elektronikeinheit (10) (ECU) zur elektronischen Ansteuerung der Ventile und der Antriebsvorrichtung (5), sowie zur Entgegennahme von elektrischen Signalen der Sensorvorrichtung (23). Der Kern der Erfindung liegt darin begründet, daß die Sensorvorrichtung (23) in dem Aufnahmekörper (3) oder in der Elektronikeinheit (10) angeordnet ist. Eine elektrische Verbindung zwischen Sensorvorrichtung (23) und Elektronikeinheit (10) erstreckt sich im Inneren des Aggregates. Dadurch wird Bauraum eingespart und ein verbesserter elektrischer Anschluß ermöglicht.
Abstract:
A method for filling a printing ink reservoir with a housing (1) is disclosed, the interior of which is divided into two chambers (3, 4), by means of a metallic bellows (2), serving as a medium separator. The first chamber (3) is filled with a gas and the second chamber (4) is filed with a fluid. A bottom valve (6) is provided n a hydraulic connection (5), the closing body (7) of which may be operated by the medium separator (2), permitting a filling of the second chamber (4) with fluid and preventing a complete emptying of the second chamber (4). According to the invention, a reliable filling of the said chambers (3, 4) with the corresponding medium may be achieved without damaging the bellows (2), by means of a combination of the following method steps: a) evacuation of the second chamber, b) filling the second chamber with printing ink and c) filling the first chamber with the gas.
Abstract:
A hydraulic energy accumulator consisting of a housing (7) with a space (4) for inserting metal bellows (5), comprising a non-moveable end and a moveable end with a front wall arranged in a sealed manner on the bellows and separating a hydraulic pressure medium from a pressurized gas is already known per se. The advantage of using metal bellows is that they are gas-tight in so far as no leak arises over time. According to the invention, the bellows are embodied in such a way that the pressure of said bellows in the gas is reduced in comparison with the hydraulic medium as a result of the longitudinal elasticity of said bellows and a sensor system (6) is provided which indicates a longitudinal expansion of the bellows (5) when the hydraulic pressure medium flows through a leak in said bellows into the area containing the gas. The inventive hydraulic energy accumulator (2) and the sensor system (6) thereof are also capable of indicating when such a leak occurs in the bellows. The indication of a leak is also an indication that a motor vehicle braking system fitted therewith has become unsafe.
Abstract:
A method for filling a printing ink reservoir with a housing (1) is disclosed, the interior of which is divided into two chambers (3, 4), by means of a metallic bellows (2), serving as a medium separator. The first chamber (3) is filled with a gas and the second chamber (4) is filed with a fluid. A bottom valve (6) is provided n a hydraulic connection (5), the closing body (7) of which may be operated by the medium separator (2), permitting a filling of the second chamber (4) with fluid and preventing a complete emptying of the second chamber (4). According to the invention, a reliable filling of the said chambers (3, 4) with the corresponding medium may be achieved without damaging the bellows (2), by means of a combination of the following method steps: a) evacuation of the second chamber, b) filling the second chamber with printing ink and c) filling the first chamber with the gas.
Abstract:
The invention relates to a pressure medium storage device that comprises a housing (1). The inner chamber of said housing is divided into two chambers (3, 4) by means of a medium separating element (2). The first chamber (3) is filled with a gas and the second chamber (4) is filled with a liquid. A sensor device (20) for detecting the movement of the medium separating element (2) is provided. The aim of the invention is to reduce the space required for assembling the pressure medium storage device. According to the invention, the sensor device (20) is arranged in the chamber (3) that is defined by the medium separating element (2) in the housing (1) and at least partially forms a body which determines the pressure-volume characteristics of the pressure medium storage device.
Abstract:
A self-contained pressure compensation system and a control method thereof are provided, wherein the self-contained pressure compensation system comprises a oil supply device, a pressure compensation device, a power unit associated with the pressure compensation device, and a switch control device, the pressure compensation device supplies oil to the power unit and detects a change in a chamber pressure of itself in real time, the switch control device triggers the oil supply device to supply oil to the pressure compensation device if the chamber pressure is less than a predetermined first threshold and triggers the oil supply device to stop supplying oil to the pressure compensation device if the chamber pressure is greater than a predetermined second threshold. The invention can detect a chamber pressure of the pressure compensation device in real-time and can achieve automatic oil refilling, and can provide pressure compensation for the power unit effectively.