Broad-frequency pressure-variable pressure pulsation attenuator

The invention discloses a broad-frequency pressure-variable pressure pulsation attenuator which comprises a shell, end caps, elastic diaphragms and orifice plates. The two ends of the shell are used for being connected with a water inlet pipe and a water outlet pipe respectively, the side wall of the outer portion of the shell is evenly provided with multiple cavities in the axial direction and the circumferential direction, each cavity is divided into an upper cavity body and a lower cavity body through one elastic diaphragm in the corresponding cavity, the upper end of each upper cavity body compresses the corresponding elastic diaphragm through the corresponding end cap so as to seal the corresponding cavity, the upper cavity bodies serve as gas pressure cavities, the lower cavity bodies serve as energy storage cavities, and energy storage device holes are machined in the side wall of the shell so that the energy storage cavities can be communicated with the inside of the shell; the inside of the shell is axially provided with multiple round orifice plates provided with inclined through holes, the orifice plates are located between two axially adjacent energy storage device holes, and the surfaces of the orifice plates are axially perpendicular to the shell. A diaphragm device energy storage set is effectively combined with an orifice plate pulsation attenuator, so that attenuation can be carried out on pressure pulsation of different frequencies and pressures, broad-frequency pressure-variable pressure pulsation attenuation can be achieved, and the attenuator is suitable for various pressure application occasions.