武汉恒美达液压气动设备有限公司:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
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电磁阀(Electromagnetic valve)是用电磁控制的工业设备，是用来控制流体的自动化基础元件，属于执行器，并不限于液压、气动。用在工业控制系统中调整介质的方向、流量、速度和其他的参数。电磁阀可以配合不同的电路来实现预期的控制，而控制的精度和灵活性都能够保证。电磁阀有很多种，不同的电磁阀在控制系统的不同位置发挥作用，常用的是单向阀、安全阀、方向控制阀、速度调节阀等。
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结构原理
输入信号增大，供气用电磁阀先导阀1换向，而排气用电磁先导阀7处于复位状态，则供气压力从SUP口通过阀1进入先导室5，先导室压力上升，气压力作用在膜片2的上方，则和膜片2相连的供气阀芯4便开启，排气阀芯3关闭，产生输出压力。此输出压力通过压力传感器6反馈至控制回路8。在这里，与目标值进行快速比较修正，知道输出压力与输入信号成一定比例为止，从而得到输出压力与输入信号的变化成比例的变化。由于没有喷嘴挡板机构，故阀对杂质不敏感，可靠性高。
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齿轮结构
高粘度齿轮泵的齿轮常见的有直齿、斜齿、人字齿、螺旋齿，齿廓主要有渐开线和圆弧型式。通常小型齿轮泵多采用渐开线直齿轮，高温齿轮泵常采用变位齿轮，输送高粘度、高压聚合物熔体的熔体泵多采用渐开线斜齿轮。齿轮与轴制成一体，其刚性及可靠性高于齿轮与轴单独制造的齿轮泵。国外低压齿轮泵的齿轮常采用方形结构，即齿轮的齿宽等于齿顶圆直径。而高压场合使用的高粘度齿轮泵的轮齿宽度小于其齿顶圆直径，这是为了减小齿轮的径向受压面积，降低齿轮、轴承的载荷。齿轮泵 泵体及加热方式
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