Pressure container corrosion fatigue testing device with closed-loop control

Abstract

The invention discloses a pressure container corrosion fatigue testing device with closed-loop control, and the device provided by the invention comprises a high-pressure pump station (1), an oil tank (2), an energy accumulator (3), overflow valves (9, 9'), an electromagnetic proportion overflow valve (7), check valves (6, 6'), a corrosion medium isolation pressurized cylinder (8) and a resistance strain gauge E, wherein the hydraulic oil of a pump station system is separated from the corrosion medium in a test container through the corrosion medium isolation pressurized cylinder (8); the resistance strain gauge E is bonded on a test container H and connected with a controller through a dynamic strain instrument and an A / D (analog / digital) card; a pressure gauge is installed in the test container H and connected with the controller through a pressure transmitter and the A / D card; and the electromagnetic proportion overflow valve (7), a two-position two-way valve (5) and a three-position four-way valve (4) are respectively connected with the controller through a D / A (digital / analog) card. The device disclosed by the invention can be used for preventing the corrosion medium from corroding the pump station system, reducing the manufacturing cost and safety of the pump station system and realizing the automatic control on a corrosion fatigue test with high accuracy.

Description

technical field [0001] The invention relates to a fatigue test device, in particular to a fatigue test device for a pressure vessel under the action of internal pressure generated by a corrosive medium. Background technique [0002] During the use of pressure vessels containing corrosive media, due to long-term repeated changes in internal pressure, it is easy to cause corrosion fatigue damage to the vessel. In order to ensure the safe use of such pressure vessels, relevant research institutions or manufacturers hope to simulate the actual working conditions to conduct necessary corrosion fatigue tests. [0003] At present, there have been relevant researches on the pressure vessel internal pressure fatigue test device in China. The invention patent "closed-loop pressure vessel fatigue test device" with the patent publication number of CN 1083589A discloses the method of using the closed-loop control method to carry out the pressure vessel fatigue test. technology. However...

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Problems solved by technology

However, this test device is unable to carry out experimental research on pressure vessels under the dual effects of corrosion and fatigue, and lacks the strain measurement and leakage monitoring of dangerous parts on the vessel shell; the fatigue testing machine imported from the United States by Nanjing University of Chemical Technology can only carry out fatigue testing of materials. Tests cannot be performed on structures such as pressure vessels or pipelines; the pressure vessel and pipeline fatigue test system imported from the United States by Nanjing University of Chemical Technology can only perform fatigue tests, not corrosion fatigue tests

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