Abstract:
Bei einem Verfahren für die kombinierte Pumpwasserdruck-Druckluft- Energiespeicherung mit konstantem Turbinen-Wasserdruck wird mit der zu speichernden Energie ein flüssiges Medium, insbesondere Wasser, in einen druckfesten, luftdichten Hohlraum insbesondere einen Druckbehälter (1 - 1.5) gepumpt, sodass ein steigender Mediumspiegel kolbenartig das im Druckbehälter (1 - 1.5) befindliche Gas, insbesondere Luft, bis zur Mediumbefüllung komprimiert und diese durch eine Verbindungsleitung in einen Druckgasbehälter (2 - 2.5) presst und mit einem Sperrventil (17.2) abschliesst, sodass die Energie in dem Druckgas gespeichert wird.
Abstract:
Ein System zur Verbesserung der Energieeffizienz bei Hydrauliksystemen, mit mindestens einem Arbeitszylinder (58), der in einem Betriebszustand als Verbraucher hydraulischer Energie und in einem anderen Betriebszustand als Erzeuger hydraulischer Energie arbeitet, und mit einem Hydrospeicher (1), der bei einem Betriebszustand des Arbeitszylinders (58) von diesem zur Energiespeicherung aufladbar und beim anderen Betriebszustand für eine Energieabgabe an den Arbeitszylinder (58) entladbar ist, ist dadurch gekennzeichnet, dass mindestens ein Hydrospeicher in Form eines verstellbaren hydropneumatischen Kolbenspeichers (1) vorgesehen ist, in dem mehrere Druckräume (19, 21, 23, 25), die an unterschiedlich große Wirkflächen (11, 13, 15, 17) an der Fluidseite des Speicherkolbens (5) angrenzen, gebildet sind, und dass eine Stellanordnung (51) vorgesehen ist, die in Abhängigkeit von den jeweiligen auf der Gasseite des Kolbenspeichers (1) und am Arbeitszylinder (58) herrschenden Druckniveaus einen ausgewählten Druckraum (19, 21, 23, 25) oder mehrere ausgewählte Druckräume (19, 21, 23, 25) des Kolbenspeichers (1) mit dem Arbeitszylinder (58) verbindet.
Abstract:
A method of and device for determining the position of a dividing piston (8) in an accumulator (1), the dividing piston (8) being magnetized by at least one magnetizing coil (22), and that the magnetic field of the dividing piston (8) is measured by a sensor coil (24) proximal to the dividing piston (8), the signal from the proximal sensor coil (24) being compared with a signal from a sensor coil (24) located at a distance from the dividing piston (8).
Abstract:
A hydraulic control unit for a hydraulic vehicle control system such as anti-lock brakes, includes a hydraulic accumulator (94) including a housing (98) which defines a cavity (96) and a passageway (104) that extends from the cavity (96) and which is adapted for interconnection with a host hydraulic circuit, preferably adjacent the high pressure outlet of the host system hydraulic pump. A closure member (118) cooperates with the housing (98) to substantially seal the cavity (96). A pre-loaded elastomeric member (112) is disposed within the cavity (96) and is compressible with increasing hydraulic fluid pressure to attenuate short duration pressure pulses therein. The elastomeric member (112) is preferably enclosed within a rigid relatively porous member (106) which, in combination, with the elastomeric member (112), substantially fills the entire volume of the cavity (96) and permits pressurized fluid to act on substantially the entire outer surface of the elastomeric member (112) to minimize the internal friction and hysterisis losses and provides the structure, along with the closure member (118) to pre-load the elastomeric member (112).
Abstract:
The invention relates to an electronically controllable brake system for a motor vehicle with a cylinder/piston arrangement provided with brake fluid. Operation of a brake pedal causes said arrangement to supply brake fluid acting on a vehicle brake. The cylinder/piston arrangement can be connected to a pump arrangement and a pressure accumulator which has a housing (10) having a fluid connection (12) for fluid flowing in or out of the housing, and a spring arrangement (30a, 30b). Brake fluid flowing in through the fluid connection (12) acts against the force of said spring arrangement, at least one part (30a) of the spring arrangement being formed by at least one part of the housing wall.
Abstract:
A hydraulically operated rock drill which includes a cylinder (12), a piston (16), inside the cylinder, which includes an annular formation (26A) which moves into and out of a section (44) of reduced dimensions which is connected to an accumulator (18), the annular formation then pressurizing hydraulic fluid in the section whereby hydraulic energy, produced by kinetic energy developed over at least part of a return stroke of the piston (16), is stored in the accumulator (18).
Abstract:
The invention pertains to a hydropneumatic suspension system, in particular for motor vehicles, with at least one hydraulic shock-absorbing strut unit (2) which in its cushioning movements uses an hydraulic medium to impact at least one hydropneumatic piston-type accumulator (6). The piston-type accumulator (6) has a separator piston (22) that separates an hydraulic accumulator (24) from a spring chamber (26) containing a compressible medium, especially a gas. The separator piston (22) is acted upon both by an hydraulic pressure (Ph) coming from the accumulator (24) and a pneumatic pressure (Pp) from the spring chamber (26), and, in addition to the forces (Fh, Fp) resulting from the action of the hydraulic pressure (Ph) and the pneumatic pressure (Pp) on the separator piston (22), at least one additional spring force (FF; FF1; FF2) acts upon the separator piston (22) of the piston-type accumulator (6). This additional spring force is produced by at least one spring element (28; 34; 36) mounted outside the spring chamber (26).
Abstract:
The pressure-producing device (10) comprises a housing (30) which is slidable relative to a stationary piston (60), the housing (30) movable within a substantially blind bore (12) to effect the pressurization of fluid. A body (14) containing the blind bore (12) includes a retention member (22) located adjacent an end opening (16) of the blind bore (12). The pressure-producing device (10) is received within the blind bore (12) wherein a closed end (32) with a seal (44) thereabout defines with an end of the blind bore (12) a pressurizing chamber (50). The piston (60) is received slidably and sealingly within an interior opening (39) of the housing (30) and extends from an end opening (34) thereof in order to engage the retention member (22) and position stationarily the piston (60). The housing (30) and piston (60) are displaced away from one another by a pressurized medium within the housing (30). The piston's (60) stationary position enables the housing (30) to slide within the blind bore (12) and effect the pressurization of fluid received within the chamber (50).
Abstract:
A piston storage device has a piston (13) with two collars (15, 16) separated by a central necked portion (14). A sealing means is arranged in both piston collars. The sealing means facing the gas chamber (18) is designed in such a manner that pressurized gas can enter the gas chamber (18) via a bore (32) through the wall of the housing, via the sealing means which is then adjusted accordingly. When the pressure in the gas chamber is as high as the pressure of the gas supply source, the sealing means returns to its original position, this sealing the gas chamber from the fluid chamber (19).