BENCH FOR HYDRAULIC TESTS OF LARGE VOLUME AND HIGH PRESSURE TANKS FOR FATIGUE LIFE Russian patent published in 2013 - IPC F15B19/00 

FIELD: machine building.

SUBSTANCE: bench is designed for fatigue life tests of large volume and high pressure tanks for storage and transportation of compressed natural gas by sea and railway, oxygen tanks, railcars and other process tanks. The bench includes controller, pressure changing law setting device, the output of which is connected to the corresponding input of controller, main pump kinematically connected to the fly wheel and electric motor and made in a form of reversible controllable motor-pump with proportional electrical control, which electrical input of control unit is connected to the corresponding output of controller, and working channels of the main pump are connected to two hydraulic lines that are connected to pressure sensors, the output of which are connected to the corresponding inputs of controller, subsidiary pump, one of the working channels of which is connected to the hydraulic tank and the second working channel - to pressure safety valve made with proportional electrical control. Note that electrical input of this valve is connected to the corresponding output of the controller, also the second channel of subsidiary pump is connected to the channel of hydraulic device, each of two channels of which is connected to the corresponding said hydraulic lines that via return valves are connected to pressure safety valve, the discharge channel of which is connected to hydraulic tank. Besides the bench includes bidirectional piston-type hydraulic cylinder with two similar rods, two similar plunger hydraulic cylinders and subsidiary pump with its own electric motor and pressure safety valve, note that the input channel of subsidiary pump is connected to the tank with water and its output channel is connected to the cavities of both plunger hydraulic cylinders and to two simultaneously tested tanks that are connected to pressure sensors, the outputs of which are connected to the corresponding inputs of the controller. Note that both hydraulic lines of the bench, connected to the working channels of the main pump, are connected to pressure gauges and to two cavities of bidirectional piston-type hydraulic cylinder with two similar rods, note that this hydraulic cylinder is located between two similar plunger hydraulic cylinders, the plungers of which are directly connected to both similar rods of bidirectional piston-type hydraulic cylinder. The bench additionally includes four hydraulic distributors with electrical control for opening, note that two (out of these four) hydraulic distributors connect in parallel the output channel of subsidiary pump and cavities of both plunger hydraulic cylinders and two simultaneously tested tanks, at that the corresponding outputs of the controller are connected to the stator of subsidiary pump electric motor and electrical inputs of two hydraulic distributors, and the other two hydraulic distributors connect one tested tank with tank with water each, note that electric inputs of these hydraulic distributors are connected to the corresponding outputs of the controller.

EFFECT: increase of bench performances, reduction of test time.

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