电动隔膜泵是一种常用的工业泵，其符号通常由以下几个部分组成：

1. 泵的形状：电动隔膜泵通常为长方形或正方形，其符号可以用一个矩形或正方形来表示。

2. 泵的进出口：电动隔膜泵通常有两个进口和两个出口，分别用箭头表示。进口箭头通常指向泵的内部，出口箭头通常指向泵的外部。

3. 泵的驱动方式：电动隔膜泵通常由电动机驱动，因此在符号中可以加入一个电动机的图标，表示泵的驱动方式。

4. 泵的隔膜：电动隔膜泵的特点是有隔膜来隔离泵的进出口，因此在符号中可以加入一个隔膜的图标，表示泵的结构特点。

综上所述，电动隔膜泵的符号可以用一个矩形或正方形表示泵的形状，矩形或正方形内部有两个箭头表示进出口，外部有一个电动机的图标表示泵的驱动方式，同时在矩形或正方形内部加入一个隔膜的图标表示泵的结构特点。

电动隔膜泵的符号示意图如下：

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