Air tightness test device, air tightness test method thereof, and leakage area measurement method

By employing a sealing assembly consisting of radial elastic expansion fasteners and thrust sleeve components, the problem of insufficient sealing performance in heat exchanger tube airtightness testing is solved, enabling reliable sealing and rapid testing of individual heat exchanger tubes. This method is suitable for airtightness testing of both in-service and new heat exchangers.

CN122108486APending Publication Date: 2026-05-29MORIMATSU (JIANGSU) HEAVY IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MORIMATSU (JIANGSU) HEAVY IND CO LTD
Filing Date
2026-03-13
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The sealing performance of existing devices used to test the airtightness of heat exchange tubes needs to be improved, making it difficult to effectively seal and independently test the airtightness of a single heat exchange tube in a heat exchanger.

Method used

A sealing assembly consisting of a radial elastic expansion fixing component, an elastic seal, and a thrust sleeve assembly is adopted. The assembly moves along the hollow shaft frame into the heat exchange pipe through an external fastening mechanism, which pushes the radial elastic expansion fixing component and the elastic seal to make tight contact with the inner wall of the heat exchange pipe, thereby achieving a reliable seal.

Benefits of technology

It enables effective sealing and independent airtightness testing of individual heat exchange tubes in heat exchangers, and can quickly and accurately detect leaks. It is suitable for airtightness testing of in-service and new heat exchangers, improving sealing performance and testing efficiency.

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Abstract

The application provides airtight test device, airtight test method and leakage area measurement method, and the airtight test device comprises two sealing assemblies, an air inlet valve connected with a heat exchange pipe to be detected through one sealing assembly, and a pressure gauge connected with the heat exchange pipe to be detected through the other sealing assembly, wherein the sealing assembly comprises a hollow shaft rack, a radial elastic expansion fixing mechanism sleeved on the hollow shaft rack, an elastic sealing element sleeved on the hollow shaft rack and located between the first expansion fixing element and the second expansion fixing element, a thrust sleeve assembly sleeved on the hollow shaft rack, an external fastening mechanism sleeved on the hollow shaft rack, and an internal locking assembly fixed on the hollow shaft rack and located on the side of the second expansion fixing element away from the elastic sealing element. The radial elastic expansion fixing mechanism and the elastic sealing element sealing assembly are adopted to effectively block the two ends of the single heat exchange pipe in the heat exchanger.
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