Pressure pulse retarding device

A pressure pulse damping device includes an inner tube and an outer tube, the inner tube being inserted into the outer tube and being fixed relative to the outer tube via a fixing portion to define a chamber between the inner tube and the outer tube; the moving part is installed in a cavity between the outer pipe and the inner pipe so as to move along the inner pipe, and the moving part divides the cavity into a first cavity and a second cavity which are in fluid isolation; the spring is configured to be arranged on the inner pipe in a sleeving mode in the first cavity, the two ends of the spring abut against the fixed part and the moving part, and a flow guide opening located in the second cavity is formed between the inner pipe and the outer pipe so as to allow fluid in the inner pipe to enter the second cavity; the moving member is configured to move along at least a portion of a length of the inner tube according to a pressure of a fluid flowing into the second chamber. 一种压力脉冲缓冲装置包括内管和外管，内管插入到外管中，并经由固定部分相