High-pressure pump and high-pressure pumping method

Abstract

The invention relates to the technical field of medical apparatuses and instruments and discloses a high-pressure pump and a high-pressure pumping method. The high-pressure pump comprises a pump bodyprovided with a piston cavity, wherein a valve assembly is arranged at one end of the piston cavity, the other end of the piston cavity slidingly contains a piston, and the outer end of the piston isconnected with a push rod. The outer side wall of the piston is peripherally provided with a first recess, and two ends of the first recess are in abutting connection with the inner side wall of the piston cavity through elastic deformation. The outer end face of the piston is provided with an installing groove, the end, opposite to the piston, of the push rod is provided with a connecting rod, the outer end face of the connecting rod is provided with a clamp-connecting part, the outer diameter of the clamp-connecting part is greater than the inner diameter of the installing groove, the connecting rod is matched with and inserted into the installing groove, and the clamp-connecting part is in interference fit with the bottom of the installing groove. The high-pressure pump has the advantages that the push rod and piston connection is firm, a larger pressure difference can be borne, dismounting is convenient, the performance of sealing the inner side wall of the piston cavity of the pump in the moving process of the piston is good, and the piston manufacturing precision requirement is lower.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a high-pressure pump and a high-pressure pumping method. Background technique [0002] In the medical high-pressure pump assembly of the prior art, the piston is received in the piston chamber of the pump body, and the piston is fixedly connected to the push rod. The movement of the push rod drives the piston to slide in the piston chamber, and the piston reciprocates to change the pressure in the piston chamber. , to generate power for the fluid in the pump body, so that the power fluid flows into or out of the chamber of the pump body. [0003] At present, the high-pressure pumps used in medical technology mainly have the following defects: [0004] 1. The common connection methods between the piston and the push rod are screw connection, bonding, welding, welding and interference fit, etc., but the above-mentioned connection methods are cumbersome to assemble and requ...

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Problems solved by technology

[0004] 1. The common connection methods between the piston and the push rod are screw connection, bonding, welding, welding and interference fit, etc., but the above-mentioned connection methods are cumbersome to assemble and require the use of specific disassembly tools;

[0005] 2. The sealing between the outer wall of the piston and the inner wall of the piston cavity is difficult to guarantee, not only the machining accuracy of the piston is very harsh, but once the sealing of the piston and the piston cavity is not guaranteed, the opening and closing of the valve assembly will be caused. Inaccurate closing control

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