Energy cavity for fatigue testing machine

The utility model relates to an energy cavity for a fatigue testing machine, which comprises a cavity body, an elastic diaphragm and a spring, the top of the cavity body is provided with an opening, and the bottom of the cavity body is provided with a vent hole; the elastic diaphragm is mounted at an opening in the top of the cavity; and the spring is arranged below the elastic diaphragm and is matched with the elastic diaphragm. According to the utility model, the water pushing stroke can be automatically adjusted by automatically adjusting the expansion and contraction amount of the spring, so that a fatigue test system can reach an optimal motion state, damage to an artificial heart valve is avoided, normal operation of a test is ensured, and the standard requirement of the test is met. 本实用新型涉及一种疲劳试验机用能量腔，包括腔体、弹性隔膜和弹簧，腔体的顶部为开口设置，且底部设置有通气孔；弹性隔膜安装在腔体顶部的开口处；弹簧安装在弹性隔膜的下方且与弹性隔膜配合。本实用新型可以通过自动调整弹簧的伸缩量实现推水行程的自动调节，从而使疲劳试验系统达到最佳的运动状态，避免对人工心脏瓣膜造成破坏的同时，保证试验的正常进行，并达到试验的标准要求。