| 摘要 |
An equalizer is located either between a downhole submersible pump and the motor or between a gas separator and its motor. There are at least two, and preferably three, flexible concentric bags spaced about a hollow tube with the first bag nested inside the second and the second is nested inside the third forming three separate spaces, i.e., a first space inside the first bag, a second space between the first and second bag, a third space between the second and third bag and a fourth space between the third bag and inside the housing and fifth space inside the hollow tube. When the motor oil heats up it flows into the first space, then through a passage with check valve into the inside of the hollow tube upwardly, and then across a passage to the second space. Another passage with another check valve connects the second space to the third space. The third space is connected by passage with a third check valve to the area outside the third flexible bag. An upper header and a lower header are attached to the hollow tube and the ends of the bags are sealed into these two headers. A shaft extends through the equalizer.
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