Medical plunger pump and cavity structure thereof

Abstract

The invention relates to the technical field of medical pumps, in particular to a medical plunger pump cavity structure, and further relates to a medical plunger pump comprising the cavity structure.The medical plunger pump cavity structure comprises a pump body, and the pump body is provided with at least one plunger cavity; the plunger cavities comprise piston working sections for reciprocatingmovement of pistons and joint sections for enabling the pistons to be connected with pushing rods in the moving process; the joint sections comprise first arc-shaped walls which are bulged away fromthe piston working sections; and the first ends of the first arc-shaped walls are smoothly connected with the side walls of the piston working sections, and the second ends of the first arc-shaped walls are bent and extend away from the axes of the piston working sections. Piston assemblies are slidably arranged in the plunger cavities and comprise the pushing rods and the pistons, the pistons comprise sealing parts closely attached to the side walls of the piston working sections and joint parts in joint with the pushing rods on the joint sections, and thus the pistons and the pushing rods are quickly jointed.

Description

technical field [0001] The invention relates to the technical field of medical pumps, in particular to a medical plunger pump and its chamber structure. Background technique [0002] In fluid power technology, high-pressure pumps are one of the core components of medical fluid power systems, and commonly used standard parts such as plunger pumps are often used. In the existing medical high-pressure pump, when the liquid enters the plunger pump for pressurization, the plunger chamber is provided with a pump-in channel and a water-out channel, and through the reciprocating motion of the piston, a steady stream of high-pressure water is pumped out. [0003] In the prior art, generally the piston and the push rod are fixedly connected, but medical pumps have high requirements for hygiene, and the piston is generally a disposable product, so the push rod needs to be removed. In order to save the cost of the push rod, it is necessary to connect the piston and the push rod For fix...

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Problems solved by technology

[0003] In the prior art, generally, the piston and the push rod are fixedly connected, but medical pumps have high requirements on hygiene, and the piston is generally a disposable product, so the push rod needs to be removed. In order to save the cost of the push rod, it is necessary to connect the piston and the push rod For fixed connection, the process is more complicated and inconvenient to use, and the piston cavity of the existing plunger pump body is generally composed of an inner wall with a constant diameter and an inclined wall, and the inner wall with a constant diameter and the inclined wall form an included angle at the joint Sharp point, when the piston is pushed into the inner wall, due to the sharp point friction between the piston and the inner wall, it is easy to scratch the outer surface of the piston, resulting in an increase in the roughness of the outer surface of the piston. Due to the high sealing requirements of the piston cavity wall, it is necessary to achieve a mirror surface As a result, the rough outer surface of the piston is easy to damage the mirror effect of the piston cavity wall, thereby reducing the service life of the pump body, and because the inner wall diameter of the inclined wall changes more gently, the length of the inclined wall increases, resulting in the entire pump chamber becoming longer and volume. Big

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