Instability test device of external pressure vessel

Abstract

The invention discloses an instability test device of an external pressure vessel. The instability test device comprises a cylinder body, a test frame, a flange, a flange cover, a pressing cover, an exhaust valve, a security valve, a digital display pressure meter, a computer, a pressure source, a water discharging valve of a buffering tank, a water discharging valve of the cylinder body, the buffering tank and a pressure sensor. When in use, the instability test device is used for pressurizing to the cylinder body, so that instability test data of a vessel to be measured can be measured under an effect of uniformly distributing external pressure on the circumference or combined circumference external pressure and axial loading effect. The instability test device has the characteristics of simple structure, accurate measurement and real-time data recording.

Description

technical field [0001] The invention relates to the technical field of pressure equipment testing, in particular to an instability testing device for external pressure vessels. Background technique [0002] At present, many pressure vessels widely used in daily life and industrial production work under external pressure. For external pressure cylinders, the main design problem is not strength, but stability; the condition to ensure its stability is that the allowable design pressure is less than the critical instability pressure. Therefore, the critical pressure is the main basis for judging the instability of a thin-walled cylinder under external pressure. The design formula for determining the critical pressure is often only an empirical formula with large errors and cannot be solved accurately, which causes a lot of inconvenience to engineering applications. In order to avoid unforeseen engineering losses and potential safety hazards caused by sudden external pressure i...

AI Technical Summary

Problems solved by technology

The design formula for determining the critical pressure is often only an empirical formula, which has large errors and cannot be solved accurately, causing a lot of inconvenience to engineering applications

In order to avoid unforeseen engineering losses and safety hazards caused by the sudden external pressure instability of the cylinder due to external pressure, it is necessary to provide a mechanical performance testing device for external pressure vessels

[0003] Although the Chinese patent ZL200920032926.3 provides a device for testing the instability of thin-walled pipe fittings under external pressure, it does not consider eliminating the influence of axial load on the instability pressure of the test piece, so it cannot be used for those that only bear uniform circumferential external pressure loads. Fittings available for testing

And it is only suitable for thin-walled pipe fittings, and the scope of use is narrow

Images