Elastic piston and high pressure pumping system and method

Abstract

The invention discloses an elastic piston and a high pressure pumping system and method. The elastic piston comprises a piston body. A front side inclined wall and a rear side inclined wall are formedon the front side and the rear side of the circumferential side wall of the piston body correspondingly, a concave area is formed between the circumferential side wall of the piston body accordingly,a first included angle is formed between the front side inclined wall and the rear side inclined wall, a second inclined angle is formed between the front side inclined wall and the center axis of the piston body, and the largest diameter of the front side inclined wall is larger than the diameter of a piston cavity wall. According to the elastic piston, the end of the front side inclined wall and the piston cavity wall form elastic abutting contact, and therefore effective seal is formed on the front side of the piston. Meanwhile, by arranging the concave area, the front side inclined wall has the larger radial elastic deformation amount, and the end of the front side inclined wall and the piston cavity wall form tight fit contact. Compared with a traditional cylindrical piston, the requirements for piston machining precision are lowered by means of the design of the front side inclined wall and the rear side inclined wall of the piston.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an elastic piston, a high-pressure pumping system and a method. Background technique [0002] In the prior art medical high-pressure pumping system, the piston is usually a cylindrical piston. The piston is received and slidably connected to the wall of the piston cavity. The piston reciprocates to provide power to pump the fluid into and out of the pump chamber. Since the piston is a cylindrical piston, in order to ensure a good seal between the piston and the wall of the piston chamber, there is a very high requirement for the machining accuracy of the piston. It is necessary to ensure that the outer diameter, cylindricity and coaxiality of the piston meet the predetermined requirements. To achieve a good seal, the piston is difficult to process and the manufacturing cost is very high. [0003] Air enters into the high-pressure pipeline to form air bubbles. Because the...

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Problems solved by technology

Since the piston is a cylindrical piston, in order to ensure a good seal between the piston and the wall of the piston chamber, there are very high requirements for the machining accuracy of the piston. It is necessary to ensure that the outer diameter, cylindricity and coaxiality of the piston meet the predetermined requirements. To achieve a good seal, the piston is difficult to process and the manufacturing cost is very high

[0003] Air enters into the high-pressure pipeline to form air bubbles. Because the air has great compressibility under high pressure, and the air gathers around the water inlet valve or the water outlet valve of the pump body, it will seriously affect the opening and closing of the water inlet valve or the water outlet valve. characteristics, resulting in the impact of high-pressure water flow on the weakest part of the pipeline, thereby changing the pressure characteristics of the entire high-pressure pipeline, which is easy to cause pipeline rupture and damage

How to prevent gas from entering the high-pressure pipeline during the suction process of the existing piston in the pumping system lacks a solution

[0004] In addition, in the existing medical pumping system, in order to reduce the difficulty of piston processing, the piston also has a structure in which an O-ring is embedded in the outer wall of a rigid plunger. The sealing performance of this structure is only determined by the O-ring. Elastic sealing, the sealing effect is not good; moreover, the structure is complex, there is a sealing dead space, it is difficult to meet the sterilization requirements

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