A low-temperature resistant multi-stage filtration device for hydraulic oil in engineering machinery

By employing a three-stage coaxially spaced filter unit in the hydraulic oil filtration device, the filtration accuracy is gradually increased and the filter media pore size is reduced, solving the problems of filter element clogging and unstable flow under low-temperature conditions. This achieves improved filtration accuracy and stability, extends filter element life, and avoids cavitation failure.

CN122124541APending Publication Date: 2026-06-02XUZHOU ZHONGYE FILTRATION TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
XUZHOU ZHONGYE FILTRATION TECH CO LTD
Filing Date
2026-04-29
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing hydraulic oil filtration devices experience a sharp increase in flow resistance under low-temperature conditions, which can easily cause filter element blockage. They cannot balance flow stability and filtration accuracy under low-temperature conditions, making it difficult to meet the long-term reliable operation requirements of extreme low-temperature operations.

Method used

The filter adopts a three-stage coaxial arrangement of an outer coarse filtration unit, a middle medium filtration unit, and an inner fine filtration unit. The filtration accuracy increases step by step, the rated pore size of the filter media decreases step by step, and the filter cartridge expands step by step under low temperature conditions, dynamically increasing the filtration area and reducing the flow resistance.

Benefits of technology

It achieves uniform graded interception of oil under low-temperature conditions, avoids rapid clogging of filter media, ensures the cleanliness of output oil, reduces flow resistance, extends filter element life, and avoids cavitation failure caused by negative pressure of hydraulic pump oil suction.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122124541A_ABST
    Figure CN122124541A_ABST
Patent Text Reader

Abstract

This invention discloses a low-temperature resistant multi-stage filtration device for hydraulic oil in engineering machinery, belonging to the field of hydraulic oil filtration technology. It includes a multi-stage filtration assembly and a flow-guiding and viscosity-reducing cylinder. The multi-stage filtration assembly comprises a cylindrical outer shell, an outer coarse filtration unit, a middle medium filtration unit, and an inner fine filtration unit. Compared with existing technologies, this invention has the following advantages: It employs a three-stage filtration system with three coaxially spaced stages: an outer coarse filtration unit, a middle medium filtration unit, and an inner fine filtration unit. Each stage consists of a V-shaped pleated elastic filter cylinder and a spiral spring-type support frame. The filtration accuracy increases progressively, and the rated pore size of the filter media decreases progressively. During operation, the oil undergoes three-stage interception, resulting in a uniform distribution of the contaminant load, preventing rapid clogging of the filter media and ensuring the cleanliness of the output oil. When the pressure difference increases under low-temperature conditions, the three-stage filter cylinders can expand progressively, dynamically increasing the filtration area and reducing flow resistance.
Need to check novelty before this filing date? Find Prior Art