公开(公告)号：US4602653A

公开(公告)日：1986-07-29

申请号：US667141

申请日：1984-11-01

申请人： Alberto Ruiz-Vela ,  Maurice J. Brooks ,  Douglas F. DeVries

发明人： Alberto Ruiz-Vela ,  Maurice J. Brooks ,  Douglas F. DeVries

IPC分类号： G05D11/13 ,  A61M16/10 ,  A61M16/12 ,  A61M16/20 ,  G05D11/02

CPC分类号： A61M16/12 ,  A61M16/204 ,  A61M2016/1025 ,  Y10T137/2499

摘要： A gas blending system includes a proportional mixing valve having a valve element movable between first and second limits of travel corresponding to a minimum and maximum percentage, respectively, of one of the gases in the blended mixture. The position of the valve element is detected by a detection mechanism, producing a position signal inputted to a microcomputer. The microcomputer also receives a control signal representing a desired percentage of one of the gases to be blended. The microcomputer calculates a desired valving element position as a function of the value of the control signal, and generates a drive signal as a function of a comparison made by the microcomputer between the detected valve element position and the desired position. A motor drives the valve element to the desired position in response to the drive signal. The system also includes an accumulator for accumulating a selected volume of gas mixture flowing from the outlet of the valve prior to delivery of the mixture to a downstream demand. The accumulator increases the effective peak flow rate capacity of the system, while "smoothing out" instantaneous changes in downstream flow rate demand before the effects of such changes are experienced at the valve.

摘要翻译： 气体混合系统包括比例混合阀，其具有在第一和第二行程限制之间移动的阀元件，其分别对应于混合混合物中的一种气体的最小和最大百分比。 阀元件的位置由检测机构检测，产生输入到微型计算机的位置信号。 微型计算机还接收表示要混合的一种气体的所需百分比的控制信号。 微型计算机根据控制信号的值计算出期望的阀元件位置，并根据微型计算机在检测到的阀元件位置与期望位置之间的比较来生成驱动信号。 电机响应于驱动信号将阀元件驱动到所需位置。 该系统还包括用于在将混合物输送到下游需求之前累积从阀的出口流动的选定体积的气体混合物的蓄能器。 蓄能器增加系统的有效峰值流量容量，同时在阀门出现这种变化的影响之前，“平滑”下游流量需求的瞬时变化。

公开(公告)号：US5331995A

公开(公告)日：1994-07-26

申请号：US916344

申请日：1992-07-17

申请人： Thomas P. Westfall ,  Alberto Ruiz-Vela ,  Anthony J. Caterina ,  Clyde R. Visser

发明人： Thomas P. Westfall ,  Alberto Ruiz-Vela ,  Anthony J. Caterina ,  Clyde R. Visser

IPC分类号： A61M16/00 ,  A61M16/20 ,  G05D7/06

CPC分类号： G05D7/0635 ,  A61M16/00 ,  A61M16/204 ,  A61M2016/0042 ,  Y10T137/0357 ,  Y10T137/7737 ,  Y10T137/776 ,  Y10T137/7761

摘要： A system including the method employed, for controlling the flow of a pressurized gas through a variable orifice flow control valve in a pressurized gas conduit system, such as a ventilator, in response to either a desired flow rate/volume input signal, a desired pressure signal or both. With respect to the flow rate input signal, the system generates a flow signal indicative of the actual flow rate of gas through the flow control valve by measuring the pressure drop across the valve and using the actual orifice area based on a control valve position signal given to the valve. This flow signal is compared to the flow rate input signal to give a correction signal which is used to form a volume flow reference signal. With respect to the desired pressure signal, a signal indicative of the effective pressure at a set location in the system is compared to the desired pressure signal and processed to give a pressure flow reference signal. Depending on the mode desired, either the volume flow reference signal or the pressure flow reference signal or the greater of the two becomes a flow reference signal that is used to generate a control valve position signal based on a predetermined relationship. This signal is then used to vary the valve orifice area and correct the flow rate.

摘要翻译： 一种包括所述方法的系统，用于响应于期望的流量/体积输入信号，控制加压气体通过加压气体导管系统（例如呼吸机）中的可变孔流量控制阀的流量，所需压力 信号或两者。 关于流量输入信号，系统通过测量阀门两端的压差并基于给定的控制阀位置信号使用实际孔口面积，产生指示通过流量控制阀的气体的实际流量的流量信号 到阀门。 该流量信号与流量输入信号进行比较，以给出用于形成体积流量参考信号的校正信号。 对于期望的压力信号，将指示系统中设定位置处的有效压力的信号与期望的压力信号进行比较，并进行处理以给出压力参考信号。 根据所期望的模式，体积流量参考信号或压力参考信号或两者中的较大者变为用于基于预定关系产生控制阀位置信号的流量参考信号。 然后，该信号用于改变阀孔面积并校正流量。