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128 条记录 (耗时 0.016 秒)

    Electrical resistance element
    81.
    发明授权
    Electrical resistance element 失效
    电阻元件

    公开(公告)号：US3694789A

    公开(公告)日：1972-09-26

    申请号：US3694789D

    申请日：1970-02-09

    申请人： ROSEMOUNT ENG CO LTD

    发明人： BROWN WILLIAM L

    IPC分类号： H01C3/00 ,  H01C1/02

    CPC分类号： H01C3/00

    摘要： This disclosure teaches a new electrical resistance element construction and a method of making same. The elements are commonly used for resistance thermometer construction wherein the electrical resistance of a material, normally a fine metallic wire, changes with respect to temperature. The resistance wire is wound onto an electrically insulated or insulative mandrel and is subsequently shielded and protected with an outer shell. A cavity (which is purposely left between the mandrel and the outer shell) is sealed at one end and then filled with a liquid, normally very pure water. If necessary, the unit is centrifuged to insure that the water fills all of the air pockets in the cavity. A container is then placed around the outer shell and a plug (if the inner mandrel is hollow) inserted inside the mandrel thus extending and enlarging the cavity beyond the extremes of the unit. The extended cavity is then filled with a very finely powdered dielectric material and water slurry. The unit is again centrifuged and the heavier dielectric material (normally alumina) will replace the water originally centrifuged into the cavity between the mandrel and the outer shell and will be compacted tightly around the resistance wire. The unit is then removed from the centrifuge and dried in an oven to evaporate any of the liquid (water) which may still be present in the unit. The open end of the cavity is then sealed and the element is ready for use. Suitable lead wires are attached prior to centrifuging and means are provided for maintaining the resistance wire wrapped around the mandrel in position so that it does not electrically short out to the mandrel or the adjacent winds of the wire do not short to each other during centrifuging. As shown, one way of doing so is to affix portions of the wire to the mandrel, or the mandrel can contain grooves which will hold the wire from longitudinal displacement during centrifuging. An alternate approach, utilizing the above described centrifuging technique is also employed. That is, a resistance element of any volume is mounted within an outer shell of any volume slightly larger than the element volume. The remaining cavity is then filled with material by centrifuging as previously described thus producing a completely supported and contained resistive element.

    摘要翻译： 本公开教导了新的电阻元件结构及其制造方法。 这些元件通常用于电阻温度计结构，其中材料的电阻（通常为细金属线）相对于温度而变化。 电阻丝缠绕在电绝缘或绝缘心轴上，随后被外壳屏蔽和保护。 一个空腔（有意地留在心轴和外壳之间）在一端被密封，然后充满液体，通常是非常纯净的水。 如果需要，将该单元离心以确保水填充空腔中的所有气穴。 然后将容器放置在外壳周围，并插入插入心轴内部的插头（如果内心轴是中空的），从而延伸并扩大腔体超出单元的极限。 然后用非常细的粉末介电材料和水浆料填充延伸的空腔。 该单元再次离心，较重的介电材料（通常为氧化铝）将替代最初离心到心轴和外壳之间的空腔中的水，并且将紧密地压在电阻丝周围。 然后将该单元从离心机中取出并在烘箱中干燥以蒸发可能仍存在于该单元中的任何液体（水）。 然后将空腔的开口端密封并使元件准备使用。 合适的导线在离心之前被连接，并且提供了用于将围绕心轴缠绕的电阻丝保持在适当位置的装置，使得其不会在心轴处电短路，或者在离心过程中彼此相邻的线的相邻风不会短路。 如图所示，这样做的一种方式是将线的一部分固定到心轴上，或者心轴可以包含凹槽，其将在离心期间将线保持纵向位移。

    Liquid level indicators
    82.
    发明授权
    Liquid level indicators 失效

    公开(公告)号：US3552209A

    公开(公告)日：1971-01-05

    申请号：US3552209D

    申请日：1969-09-08

    申请人： ROSEMOUNT ENG CO LTD

    发明人： JOHNSTON JAMES STEWART

    IPC分类号： G01C13/00 ,  G01F23/26 ,  G01F23/00

    CPC分类号： G01C13/004 ,  G01F23/265

    摘要： A LIQUID LEVEL INDICATOR, PARTICULARLY SUITABLE AS A TIDE GAUGE, INDICATES THE MEAN LEVEL OF A LIQUID. A NUMBER OF SENSING ELEMENTS, E.G. CAPACTIVE ELECTRODES OR DONCUTIVITY SENSORS, SPACED VERTICALY, SENSE THE PRESENCE OR ABSNCE OF LIQUID AT EACH ELECTRODE AND GIVE SIGNALS WHICH MAY BE CONVERTED TO A BINARY DIGITAL NUMBER INDICATING THE INSTANTANEOUS LEVEL. THIS DIGITAL OUTPUT SIGNAL CONTROLS A SERIES OF AND GATES TO PASS PULSES WHICH, FOR EACH GATE, ARE AT A RATE CORRESPONDING TO THE SIGNIFICANCE OF THE APPROPRIATE DIGIT. THE PULSES ARE NON-COINCIDENT PULSES OBTAINED BY DIVIDING DOWN THE OUTPUT OF AN OSCILLATOR. THE TOTAL NUMBER OF PULSES FROM ALL THE GATES OVER A PREDETERMINED PERIOD IS FED TO A COUNTER WHICH INDICATES THE MEAN LEVEL OVER THAT PERIOD. BY USING PULSE TRAINS, THE LEVEL IS AVERAGED OVER A PERIOD OF TIME ENABLING THE MEAN LEVEL TO BE DETERMINED TO AN ACCURACY BETTER THAN THE ELECTRODE SPACING.