Jet velocity measuring apparatus
    2.
    发明授权
    Jet velocity measuring apparatus 失效
    喷射速度测量仪

    公开(公告)号:US4733962A

    公开(公告)日:1988-03-29

    申请号:US847653

    申请日:1986-03-17

    CPC分类号: G01P5/18

    摘要: A jet velocity measuring apparatus is disclosed for measuring the velocity of a fluid stream. The apparatus (10) measures the time delay between primary electronic signals generated by a first photosensitive device (32) as a result of a first beam of light from a light source (34) being reflected by a portion of the surface (S) of the stream (24) and secondary electronic signals generated by a second photosensitive device (36) as a result of a second beam of light from a light source (38) being reflected downstream by substantially the same portion of the surface of the stream (24). The apparatus includes a housing (22) disposed parallel to the plane (P2) of the surface of the stream. A first and a second fiberoptic bundle (42, 44) transmit light from the light source (34, 38) to the surface of the stream (24) and back respectively to the photosensitive devices (32, 36). Debris-deflecting slots (88, 90) are disposed adjacent to the housing (22) for deflecting debris therefrom.

    摘要翻译: PCT No.PCT / US86 / 00149 Sec。 371日期:1986年3月17日 102(e)1986年3月17日PCT PCT 1月24日PCT公布。 第WO87 / 04524号公报 日本1987年7月30日公开了一种用于测量流体流速度的喷射速度测量装置。 装置(10)测量由第一光敏装置(32)产生的初级电子信号之间的时间延迟,这是由于来自光源(34)的第一光束被表面(S)的一部分反射的结果 作为来自光源(38)的第二光束的结果,由第二感光装置(36)产生的流(24)和二次电子信号由下游的流的表面的基本上相同的部分(24)反射 )。 该装置包括平行于流表面的平面(P2)设置的壳体(22)。 第一和第二光纤束(42,44)将光从光源(34,38)传输到流(24)的表面并分别返回到感光装置(32,36)。 碎片偏转槽(88,90)邻近壳体(22)设置,用于使碎片偏转。

    Stepper motor control circuit
    3.
    发明授权
    Stepper motor control circuit 失效
    步进电机控制电路

    公开(公告)号:US4358725A

    公开(公告)日:1982-11-09

    申请号:US189911

    申请日:1980-09-23

    IPC分类号: H02P8/12 G05B19/40

    CPC分类号: H02P8/12

    摘要: A stepper motor control circuit for a step motor and step motor control which has substantially higher efficiency than the motors and the control circuits of the prior art and which uses a chopper current control and phase control for each of the two phases of a two phase step motor and wherein each phase has two separate windings that are magnetically coupled together. The invention provides a three step switching sequence which produces different current paths in each step so that a higher operating efficiency is achieved than circuits in the prior art.

    摘要翻译: 一种用于步进电动机和步进电动机控制的步进电动机控制电路,其具有比现有技术的电动机和控制电路显着更高的效率,并且对于两相步骤的两相中的每一个使用斩波电流控制和相位控制 电动机,并且其中每个相具有磁耦合在一起的两个分离的绕组。 本发明提供了三步切换序列,其在每个步骤中产生不同的电流路径,使得比现有技术中的电路实现更高的操作效率。

    Extended low frequency range pulsation attenuator
    4.
    发明授权
    Extended low frequency range pulsation attenuator 失效
    扩展低频范围脉动衰减器

    公开(公告)号:US4308095A

    公开(公告)日:1981-12-29

    申请号:US169937

    申请日:1980-07-18

    CPC分类号: D21F1/065 Y10T137/3118

    摘要: Apparatus for attenuating low frequency pressure variations in a stock suspension being fed to a paper machine. The apparatus includes a pressurized overflow chamber having an inlet which delivers a stock suspension therein and an outlet for discharging stock from the chamber. A first control means controls the pressure applied to the suspension in the overflow chamber. The chamber communicates with a sump which receives the overflow from the overflow chamber. A sensing means senses the stock pressure in the inlet conduit and a second sensing means senses the level of stock in the sump. A high pass filter receives a signal from the first sensing means and a low pass filter receives a signal from the second sensing means. A summing amplifier receives the output of the high and low pass filters. A control means receives the output of the summing amplifier and is connected to the overflow means to control operation of an overflow valve in response to the output of the summing amplifier.

    摘要翻译: 用于衰减供给到造纸机的原料悬浮液中的低频压力变化的装置。 该装置包括加压溢流室,该加压溢流室具有在其中输送储料悬浮液的入口和用于从该室排出原料的出口。 第一控制装置控制施加到溢流室中的悬架的压力。 该室与从溢流室接收溢流的贮槽连通。 感测装置感测入口管道中的储存压力,第二感测装置感测贮槽中的库存水平。 高通滤波器接收来自第一感测装置的信号,低通滤波器接收来自第二感测装置的信号。 加法放大器接收高通滤波器和低通滤波器的输出。 控制装置接收加法放大器的输出,并连接到溢流装置,以响应于加法放大器的输出来控制溢流阀的操作。

    Inhibiting noise in sheet spreaders
    5.
    发明授权
    Inhibiting noise in sheet spreaders 失效
    抑制片材撒布机中的噪音

    公开(公告)号:US4176775A

    公开(公告)日:1979-12-04

    申请号:US782065

    申请日:1977-03-28

    摘要: Objectionable noise is inhibited in sheet spreaders of the type wherein strips of a slit traveling web are laterally separated by running the strips over spaced, bowed hollow spreader bars, frictional resistance being alleviated by floating the strips on a layer of air covering the areas of the bars wrapped by the strips. Tendency toward high frequency vibration and thus noise experienced in high speed operation is inhibited by ventilation in the tangency angles between the bars and the running strips.

    摘要翻译: 在这种类型的片材撒布机中抑制了不利的噪音,其中狭缝移动幅材的条带通过在间隔开的弯曲的中空扩张器条上延伸条而横向分离,摩擦阻力通过将条带浮在覆盖 条被条包裹。 对于高频振动的趋势,因此在高速运行中经历的噪声在条和行驶条之间的相切角度的通风被抑制。