Accumulator fatigue test device and test method

Abstract

The invention relates to the technical field of energy accumulator fatigue tests, in particular to an energy accumulator fatigue test device and a test method. The device comprises a loading system and a pressure relieving system; the loading system includes at least two branched oil supply pipelines and a main oil supply pipeline; one ends of all the branched oil supply pipelines are communicated with an oil tank, and the other ends are connected with each other in parallel and communicated with one end of the main oil supply pipeline; the other end of the main oil supply pipeline is communicated with an energy accumulator; two branched oil supply pipelines are respectively provided with high-flow high-pressure oil pumps and low-flow ultrahigh-pressure oil pumps; the pressure relieving system is provided with an oil extracting pump and an oil extracting pipeline; the unloading time of the energy accumulator can be shortened; and the high-volume energy accumulator fatigue test efficiency is further improved. Through pressurizing an energy accumulator shell combination through a high-pressure oil pump motor set and an ultrahigh-pressure oil pump motor set, high-efficiency pressure fatigue tests of all nominal volume grade and design pressure grade energy accumulators in 0-70 MPa are realized.

Description

technical field [0001] The present invention relates to the technical field of accumulator fatigue test, more specifically, it is a fatigue test complete set and test method that can match the loading and unloading modes in the range of 0-70 MPa according to the peak pressure of the fatigue test of the accumulator shell to realize high-efficiency tests . Background technique [0002] As an energy storage device, the accumulator is widely used in hydraulic and pneumatic systems. When the accumulator is working, its shell is subject to frequent pressurization and decompression, which is prone to pressure fatigue failure of the accumulator. Therefore, it is of great significance to study the pressure fatigue strength of the accumulator shell for the safe use of the accumulator. [0003] In recent years, a variety of fatigue test systems have emerged in China. However, the current test devices are often designed for a certain range of pressure values ​​and specific product volu...

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Problems solved by technology

[0003] In recent years, a variety of fatigue test systems have emerged in China. However, the current test devices are often designed for a certain range of pressure values ​​and specific product volumes, and the nominal volume levels of accumulators are divided into 21 levels from 0.4L to 250L. , the design pressure level is divided into 9 levels from 6.3MPa to 63MPa, and the product technical parameters span a large range

At present, there is no fatigue test device that can meet the accumulator test requirements of all nominal volumes and design pressure levels, and if multiple sets of test devices are used to adapt to the fatigue test of accumulators with similar nominal volumes and design pressure levels, it will cause serious damage. big waste

In addition, the existing test system is to relieve pressure through the pressure difference between the test product and the fuel tank, but as the pressure difference decreases, the pressure relief speed will also decrease, and the long pressure relief time also greatly affects the entire fatigue test. efficiency

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