A pressure testing device for all-vanadium redox flow batteries

By combining the push sleeve and the extrusion ring expansion sleeve, the problem of low efficiency in pipeline sealing testing in vanadium redox flow battery systems is solved, enabling rapid and reliable sealing testing. It is applicable to pipelines of different diameters, shortens testing time, and improves production efficiency.

CN224435698UActive Publication Date: 2026-06-30SHANDONG ELECTRICAL & ELECTRICAL GROUP LIQUID FLOW ENERGY STORAGE DEVELOPMENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANDONG ELECTRICAL & ELECTRICAL GROUP LIQUID FLOW ENERGY STORAGE DEVELOPMENT CO LTD
Filing Date
2025-07-08
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing vanadium redox flow battery systems have low efficiency in pipeline sealing tests, which must be carried out after complete installation. If a leak is found, it needs to be checked section by section, which is time-consuming and labor-intensive. In addition, traditional pressure testing is cumbersome and cannot meet the needs of rapid testing.

Method used

It adopts a push sleeve and gas pipeline threaded connection, and installs a compression ring and expansion sleeve. By rotating the push sleeve, the compression ring moves towards the expansion sleeve, and the conical surface compresses the expansion sleeve to form a sealing structure, achieving rapid sealing. It is suitable for different pipe diameters and can be connected to a gas source for pressure testing through a quick connector.

Benefits of technology

Sectional testing can be performed without fully installing the piping system, shortening testing time and avoiding the need for segment-by-segment troubleshooting after a leak. It enables rapid sealing testing, is suitable for pipes of different diameters, and has a sealing pressure of 0.6-1.0 MPa with a leakage rate of ≤0.5%.

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Abstract

This invention provides a pressure testing device for vanadium redox flow batteries, relating to the field of flow energy storage testing equipment. It employs a push-pull sleeve and a threaded gas delivery pipe, with a compression ring and an expansion sleeve installed between the ends of the sleeve and the pipe. Rotating the push-pull sleeve causes it to move axially along the gas delivery pipe, driving a retaining ring to push the compression ring towards the expansion sleeve. The conical surface of the compression ring penetrates the expansion sleeve, applying radial pressure to cause it to expand outwards and tightly adhere to the inner wall of the tested pipe, forming a sealed structure. This eliminates the need for complex connections such as threads or plugs, achieving rapid sealing through mechanical deformation. A quick-connect fitting connects to a gas source, a control valve regulates the pressure, and a pressure gauge monitors the pressure inside the pipe, enabling sealing tests. Sectional testing can be performed without fully installing the pipeline system, avoiding the need for segmented troubleshooting after a leak and shortening testing time.
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