Water hammer pulse testing machineAs the core equipment for simulating fluid impact loads in pipeline systems, its structural design directly determines the testing accuracy and ability to reproduce operating conditions. From power output to pulse formation, various systems work together to build a complete durability verification system for pipe fittings, meeting the full scenario testing requirements from civilian pipe fittings to industrial high-pressure pipelines.
The power system is the "heart" of equipment operation, playing a crucial role in providing continuous energy. The mainstream equipment mostly adopts electro-hydraulic servo system, which consists of high-pressure oil pump, servo motor and accumulator. The servo motor adjusts the speed through frequency conversion control, drives the oil pump to pressurize the hydraulic oil to 10-300MPa, meeting the testing requirements of different pressure levels; The accumulator is like an "energy buffer zone" that can store instantaneous high-pressure oil, avoiding pressure fluctuations caused by frequent motor starts and stops. For ultra high flow testing scenarios, some equipment will be equipped with a dual pump linkage system, which can achieve high-frequency pulse driving of more than 1000 times per minute through flow superposition, ensuring stable power output during simulated working conditions.
The pressure regulating system is a "regulating valve" that controls the pulse intensity, mainly composed of pressure sensors, proportional relief valves, and closed-loop control systems. The pressure sensor monitors the oil pressure in real time, with an accuracy of ± 0.5% FS. After the data is fed back to the PLC controller, the proportional relief valve adjusts the oil discharge volume through electromagnetic proportional control, stabilizing the system pressure at the set value. For example, when testing plastic pipe fittings, the system will control pressure fluctuations within ± 1% to avoid premature damage to the specimen due to sudden pressure changes; When testing metal fittings, a wider range of pressure impacts can be allowed, which more realistically simulates the instantaneous load of industrial pipelines.
The pulse generator is the "core actuator" that forms the water hammer effect, and its structural design directly affects the restoration degree of the pulse waveform. The common piston generator controls the reciprocating motion of the piston through a servo valve, squeezes the test medium (water or oil) to generate periodic pressure pulses, and the piston stroke and frequency can be independently adjusted to achieve various waveform outputs from sine wave to square wave. Better equipment will also be equipped with a waveform correction module, which eliminates the attenuation of pulses caused by pipeline damping through compensation algorithms, ensuring that the waveform reaching the specimen coincides with the preset curve by more than 95%. For scenarios that require simulating the "water hammer" characteristics of water hammer, the generator will complete a transition from low pressure to high pressure within 0.1 seconds, reproducing the instantaneous impact when the pipeline suddenly closes.
The specimen fixture and circulation pipeline are the "bridge" connecting the equipment and the tested specimen. The fixture needs to be customized according to the specifications of the pipe fittings, using a quick installation structure to complete the loading and unloading of the test piece within 3 minutes. At the same time, there should be no leakage at the interface of the V-shaped sealing environmental protection certificate, and the pressure resistance level should be consistent with the main system. The circulation pipeline is made of stainless steel or high-strength alloy material, and the inner wall is polished with a mirror finish to reduce the interference of fluid resistance on the pulse waveform. Some pipelines are also wrapped with heating sleeves, which are used in conjunction with a temperature control system to simulate high and low temperature environments ranging from -40 ℃ to 150 ℃.
In addition, the measurement, control, and safety system provides assurance for the operation of the equipment. Real time collection of pressure, temperature, cycle times and other data by industrial computers to generate test reports; The emergency stop button, overpressure protection valve, and infrared safety grating constitute multiple protections. Once an abnormality is detected, the power source is immediately cut off to avoid safety accidents.
The precise coordination of these systems enablesWater hammer pulse testing machineIt can accurately reproduce the water hammer effect during pipeline operation and ensure long-term stable operation through structured design, providing reliable hardware support for the quality verification of pipe fittings.
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