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。