摘要:
An arrangement is disclosed for adjusting a valve which has a tappet which is under the effect of a restoring spring. In a housing (9) which is to be attached to the valve, a temperature-dependent actuating element (11) which interacts with a working piston (13) is arranged. The actuating element is a metallic component (11) which is composed of an alloy and has an impressed shape memory which extends essentially transversely with respect to the direction of movement of the tappet of the valve. Including the working piston (13) it can be adjusted in the direction of movement of the tappet between two end positions which correspond on the one hand to the open position of the valve and on the other hand to its closed position. The metallic component (11) assumes a shape corresponding to the impressed shape memory when it is heated in its first end position. A pressure unit which acts on the metallic component (11) and by which said metallic component (11) is held in its second end position when the heating stops is mounted in the housing (9).
摘要:
Device and method for limiting adverse events during supplemental oxygen therapy are disclosed. In the present invention, the oxygen flow between a patient and an oxygen source is controlled with a valve such as a proportional solenoid capable of constraining flow-rates within a continuous range. The flow-rate of oxygen is accurately controlled in a closed-loop with flow-rate measurements. Measures of a patient's vital physiological statistics are used to automatically determine optimum therapeutic oxygen flow-rate. Controller signal filtering is disclosed to improve the overall response and stability. The control algorithm varies flow-rates to minimize disturbances in the patient feedback measurements.
摘要:
Es wird eine Anordnung zur Einstellung eines Ventils angegeben, das einen unter der Wirkung einer Ventilfeder stehenden und zwischen zwei Endstellungen in axialer Richtung verstellbaren Stößel aufweist. Zur Verstellung des Stößels ist ein mit einem in seiner Achsrichtung bewegbaren Arbeitskolben ausgerüsteter, temperaturabhängiger Dehnkörper am Ventil befestigt, der durch einen an eine Spannungsquelle anschließbaren, elektrischen Widerstand beheizbar ist und dem ein durch den Arbeitskolben des Dehnkörpers bewegbares Stellglied zugeordnet ist. Zwischen dem Widerstand und der Spannungsquelle ist ein durch einen Mikroprozessor zu betätigender, elektrischer Schalter angeordnet und an den Mikroprozessor ist eine mit dem Stellglied gekoppelte Meßeinrichtung elektrisch leitend angeschlossen, die von der Position des Stellgliedes abhängige elektrische Spannungswerte an den Mikroprozessor liefert. Die Meßeinrichtung weist ein feststehendes, lineares CCD-Array (25) auf, das eine mit einer Vielzahl von Pixeln bestückte Oberseite und eine Unterseite hat, an der elektrische Spannungswerte abgreifbar sind, deren Größe von der Intensität von auf die Pixel fallendem Licht abhängig ist, und das mit dem Mikroprozessor verbunden ist. Mit dem Stellglied ist eine über der Oberseite des CCD-Arrays (25) bewegbare Abdeckung (24) verbunden, deren Abmessungen klein sind im Verhältnis zu den Abmessungen des CCD-Arrays (25), durch welche in Abhängigkeit von der Position des Stellgliedes eine der Form der Abdeckung (24) entsprechende Anzahl von Pixeln des CCD-Arrays (25) abgedeckt oder belichtet ist.
摘要:
A method and apparatus for treating a breathing disorder and, more particularly, a method and apparatus for providing a pressurized air flow to an airway of a patient to treat congestive heart failure in combination with Cheyne-Stokes respiration and/or sleep apnea or other breathing disorders. A positive airway pressure ventilator is utilized in combination with an algorithm that adjusts IPAP and EPAP in order to counter a Cheyne-Stokes breathing pattern. Cheyne-Stokes respiration is detected by monitoring a peak flow of the patient.
摘要:
Eine Ventilanordnung weist zur Steuerung ein Pilotventil (5) mit piezoelektrischem Betätigungsorgan (31) auf. Das Pilotventil (5) ist mit einer Wechselspannung angesteuert, so dass dessen Betätigungsorgan (31) schwingt, um einen Gasfluss freizugeben.
摘要:
The invention concerns a shape memory alloy-actuated flow controller (600), comprising: a rotatable flap having a shaft (620) along an axis about which said rotatable flap rotates; and an actuator disposed within said shaft (620) and configured to generate a force causing said rotatable flap to rotate, said actuator comprising a shape memory alloy ("SMA") actuator including a number of SMA elements.
摘要:
A new treatment and apparatus for acute and chronic treatment is described here which incorporates nasal ventilation, with or without concomitant drug therapy, using continuous positive airway pressure (CPAP) or bi-level pressure treatment or variants thereof, including devices which automatically set their pressures based on physiologic data inputs.
摘要:
A piezoelectric valve having a diaphragm (38) which is kept in contact with a valve seat (52) when a drive signal is not applied to a piezoelectric element (42) to separate diaphragm chambers (24a and 24b) from a passage (54), wherein, even if the pressure of fluid introduced into the diaphragm chambers (24a and 24b) is varied, the diaphragm (38) is firmly supported against the valve seat (52) without causing any deformation, and the passage (54) is closed securely by a cover, whereby eliminating the possibility of fluid leakage. On the other hand, the diaphragm (38) is bent when the drive signal is applied to the piezoelectric element (42) to allow communication of the diaphragm chambers (24a and 24b) with the passage (54) and guide fluid to the passage (54). If the piezoelectric element (42) is forced to bent excessively, it will be kept in contact with a cushion member (56) so as to prevent the piezoelectric element (42) from being deformed excessively, whereby eliminating the possibility of damage to the piezoelectric element (42).
摘要:
An amperage control for an electrically operated valve (24) having a coil. A process control apparatus (20) generates a plurality of electrical operating data signals, each signal corresponding to an operating parameter of the valve (24). A valve control apparatus (22) transmits voltage to the coil of the valve to control the operation of the valve (24), the valve control apparatus (22) receiving at least one operating data signal generated by the process control apparatus (20). A current flow is created in the coil of the valve (24) upon receiving voltage from the valve control apparatus (22). A current senses apparatus (26) senses the flow of current in the electrically controlled valve (24) and creates an electrical signal responsive to the current flow in the coil of the valve (24). When the signal created by the current sensing apparatus (26) is applied to the valve control apparatus (22), the valve control apparatus (22) modifies the operation of the valve responsive to the signal created by the current sensing apparatus (26).
摘要:
The invention relates to a control element (1) for media, for instance, a pneumatic valve (2) or a hydraulic valve, comprising a valve body in which one or several channels (8) are arranged, at least one moving element (11) arranged in a channel (8) and means for carrying out a relative movement of and/or deforming the moving element (11). Said means (30) are directly arranged on and/or directly act upon the moving element (11).