Pump Assembly
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United States of America Patent
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Issued Date -
Mar 28, 2024
app pub date -
Nov 15, 2021
filing date -
Dec 14, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
A pump assembly with improved sealing includes an outer housing and an insert arranged therein. The insert includes a rotatable shaft and at least two pressure stages. Each pressure stage has a housing, an impeller, and a seal that separates a first pressure chamber from a second pressure chamber. At least one of the pressure stage housings includes a first casing part having a first region having an enlarged inner diameter and a second region having a reduced inner diameter, and a second casing part having at least one first portion having a reduced outer diameter and a second portion having an enlarged outer diameter. The first region surrounds the first portion and at least partially surrounds the second portion, such that an annular chamber is formed between the first casing part and the second part, with the annular chamber being connected to the second pressure chamber.
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