摘要:
Bei einer Hydraulikeinrichtung ist wenigstens ein Regelventil (15) mit wenigstens drei Schaltstellungen mit einer Regelpumpe (18) verbunden, wobei über eine Steuerrückleitung das Regelorgan (18a) der Regelpumpe zwecks Einhaltung eines konstanten Betriebsdruckgefälles mit der Versorgungsleitung (19) nach dem Regelventil (15,15') verbunden ist. Die Rückstromleitung (21) ist über das Regelventil (15) geführt, das über den Verbrauchern zugeordnete Zuschaltventile mit den Verbrauchern (V) verbunden ist, wobei der Rückstromleitung (21) ein Meßwertaufnehmer zugeordnet ist, der in Verbindung mit dem Meßwertaufnehmer der Versorgungsleitung eine Regelgröße für eine Regeleinheit (R) bildet. Dadurch wird eine kostengünstige Regelung oder Steuerung der Verbraucher in zwei Wirkrichtungen über ein Regelventil präzise und energiearm erreicht.
摘要:
Système et méthode de régulation de la pression dans le cylindre de frein (56) d'un frein de roue. Le cylindre hydraulique est connecté à une électropompe (12) et une valve de régulation de débit (50, 50', 100) est connectée entre la pompe et le cylindre de roue. Le système et la méthode permettent de régler la vitesse d'une électropompe de manière à générer la pression voulue dans un cylindre de frein; à générer une pression différentielle, dans la valve de régulation de débit, proportionnelle au débit de la pompe, et à communiquer celle-ci à un élément de valve soumis à l'action d'un ressort; à provoquer le mouvement de l'élément de valve, en réponse aux forces générées par la pression différentielle et agissant sur l'élément de valve, et à la force du ressort de compensation, de manière à ouvrir et fermer sélectivement un orifice de sortie associé, connecté à un drain ou à un réservoir, de telle manière que dans l'état stable, une condition d'équilibre est atteinte dans laquelle les forces de pression sont égales à la force du ressort et la pression dans le cylindre hydraulique est constante.
摘要:
Dispositif de commande hydromécanique de distribution d'un débit de fluide dans lequel un moteur électrique (1) entraîne une pompe (11) de mise en pression d'un récepteur hydraulique (20), caractérisé par le fait que l'arbre (3) du moteur (1) contrôle un moyen de commande (13) de décompression dudit récepteur (20) , dans le but d'éviter la modification d'état dudit récepteur pendant les arrêts de fonctionnement du moteur (1) et de la pompe (11) ou de permettre la décompression dudit récepteur (20) pendant l'inversion du sens de rotation de l'arbre (3) du moteur.
摘要:
A gas container at constant pressure, specifically for biogas, comprising, in combination, a flexible covering or outer membrane which covers the biogas source so as to form an insulated from the outside space or canopy and a flexible and impermeable membrane located at the inside of said space and thereby dividing it in two chambers or volumes of which a lower one is occupied by biogas and an upper one comprises an air chamber of lung from which and into which air is taken off or supplied to comply with the steps of collecting, stocking and taking off the biogas at a substantially constant pressure.
摘要:
A compressor drive system for controlling the gas pressure in a pressure gas volume (106) connected to the compressor (101). A brushless alternating current motor (23) is directly coupled to the compressor, which is driven with the same speed as the motor. The pressure in the gas volume (106) is sensed by pressure sensing means (109) connected to a converter (114). The converter simultaneously changes the amplitude and frequency of the drive voltage supplied to the motor (23). This is done in response to pressure changes in volume (106). The motor is stopped if the pressure exceeds a preset maximum value. A pressure gas container (104) is depressurized at motor stop to allow restarting without counter pressure on the compressor. Means (44) for controlling the amplitude and frequency of the drive voltage is provided so that the normal speed maximum load current is never exceeded during motor start.
摘要:
The present invention is a fluid distribution system comprising connected conduits (e.g., lines) wherein fluid flows, such as pipes within a building. The lines may be configured to: (i) include multiple lines that connect at intersections (some of the intersections will be identified as nodes); and (ii) incorporate node units associated with line pressure loss simulation assemblies ("LLSAs"). Activities of a node unit incorporating a LLSA can result in alterations in fluid pressure, such as by a loop control process to reposition balancing valves or other valves of one or more LLSAs, and/or by alteration of the speed of the system pump. These activities adjust fluid pressure to cause the system to produce a balanced and high efficiency energy transfer (e.g., heating or cooling), and do not involve or require any identification or use of any specific, fixed or absolute pressure value. They function based on an operation locus (for a node unit) and/or an operation locus range (for node unit groupings) to adjust the fluid pressure.
摘要:
Provided is a multi-range field full-automatic pressure and electric signal calibrating instrument, comprising: control components such as a shell (9), a power switch (94), multiple-interfaces (95), a display (91), a keyboard (92), and a gas pressure generating unit (1), a power supply unit (3), a pressure detecting unit (4), a gas pressure control unit (2) and an electric signal detecting unit (5); the pressure output end of the pressure control unit (2) is in parallel connection with pressure joints which are used for installing multiple pressure standard meters (60) and detected meters (7) with different ranges; the pressure control unit (2) is in signal connection with the pressure standard meters (60); the electric signal detecting unit (5) is in signal connection with the pressure control unit (2) and the detected meters (7); the power supply unit (3) can supply power by batteries. The calibrating instrument does not need to be externally connected with a gas cylinder and an alternating current power supply and can automatically generate a gas pressure and generate an accurate standard pressure; the design of the multi-range pressure standard meter can be suitable for various detected meters; the double detection and calibration for pressure and electric signals can be implemented; the weight and volume of the instrument are small; and the multi-range field full-automatic pressure and electric signal calibrating instrument is convenient to carry in the field and can carry out automatic calibration on various field pressure instruments.
摘要:
A system includes a fluid controller coupled to an inflatable bladder and configured to add fluid to and remove fluid from the inflatable bladder, a control unit (2840) configured to provide information used by the fluid controller to adjust the pressurization of the inflatable bladder, the control unit including a user interface configured to constantly display a plurality of indicia corresponding to a range of pressure levels in which the inflatable bladder is employed by a user, where each of the plurality of indicia is associated with a different level of pressure of the inflatable bladder, respectively. In one embodiment, the fluid controller is configured to adjust the pressurization, in response to a user input at the user interface, to a pressure level selected by the user based on a current pressure level of the inflatable bladder, the pressure level selected by the user and an operating time of the fluid controller. In a further embodiment, a first indicia included in the plurality of indicia is associated with the current pressure level and a second indicia included in the plurality of indicia is associated with the pressure level selected by the user.