Single-shaft eccentric screw pump

The single-shaft eccentric screw pump facilitates easy and automated adjustment of rotor and stator tightness, addressing the challenges of temperature and wear-induced changes, ensuring consistent performance without disassembly or fluid pathway alteration.

TW202632141APending Publication Date: 2026-08-01HEISHIN ENGINEERING & EQUIPMENT CO LTD
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Patent Information

Application Number
TW114139191
Authority / Receiving Office
TW · TW
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-10-28
Filing Date
2025-10-13
Publication Date
2026-08-01

AI Technical Summary

Technical Problem

Existing single-shaft eccentric screw pumps struggle with the need for complex adjustments in tightness or clearance between the rotor and stator due to temperature variations and wear, lacking automation capabilities.

Method used

A single-shaft eccentric screw pump design that allows for easy adjustment of rotor and stator tightness through a moving mechanism, enabling the bearing and input shaft to move closer to or further away from the stator along the axial direction, without disassembling the pump or affecting fluid contact components, and can be automated.

Benefits of technology

Enables easy and automated adjustment of rotor and stator tightness, maintaining pump performance despite volume changes due to temperature or wear, without requiring component replacement or altering fluid pathways.

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Abstract

The present invention provides a single-shaft eccentric screw pump that allows for easy adjustment of the tightness or clearance between the rotor and stator, and also enables automation. The single-shaft eccentric screw pump (1) comprises: an input shaft (3) rotatably supported on a bearing (32) and rotated by a drive; a rotor (5) connected to the input shaft (3) in a manner that enables eccentric rotation; a stator (12) into which the rotor (5) can be inserted; and a bearing housing (30) for housing the bearing (32), into which the input shaft (3) can be inserted; the single-shaft eccentric screw pump (1) can be formed in a manner that either or both of the outer diameter of the rotor (5) and the inner diameter of the inner hole (12a) of the stator (12) are made to decrease as they move from one end toward the other, or to change the eccentricity of the rotor, and has a moving mechanism (50) that moves the bearing (32) and the input shaft (3) together along the axial direction of the input shaft toward or away from the stator (12). none.
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