Reciprocating Piston Pump With Auxiliary Piston for Media Separation
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Solution Overview
Problem
Existing reciprocating piston pumps face issues with media separation, leading to leakage of conveyed media into lubricating mediums, which deteriorates lubrication properties and causes wear, while existing solutions like gland seals, elastomer seals, and diaphragms suffer from leakage, high friction, and limited frequency due to viscoelastic properties.
Innovation Solution
The introduction of an auxiliary reciprocating piston between the drive and the main piston, forming a lubrication chamber with a smaller head surface, ensures media separation by allowing leakage only from the lubrication chamber to the drive, reducing friction and extending maintenance intervals, and incorporating a lubrication system to maintain contact surfaces and bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gland seal is used to separate media, then media separation is achieved, but leakage into lubricant occurs and friction increases
Solution Approach 1:
The pump is divided into two separate chambers: a conveying chamber for the medium and a lubrication chamber for the lubricant. The auxiliary reciprocating piston creates a lubrication chamber that is spatially separated from the main conveying chamber, preventing direct contact between medium and lubricant while maintaining effective sealing.
Solution Approach 2:
The auxiliary reciprocating piston acts as an intermediary element between the drive and the main reciprocating piston. It creates a lubrication chamber that mediates the lubrication function while maintaining media separation, allowing lubricant to be supplied to contact surfaces without contaminating the conveyed medium.
2Reliability
If a diaphragm is used for media separation, then complete separation is achieved, but wear occurs and frequency is limited
Solution Approach 1:
The diaphragm is extracted from the design and replaced by a mechanical sealing system using the auxiliary reciprocating piston. This eliminates the wear-prone diaphragm while maintaining complete media separation through the lubrication chamber design that prevents medium penetration into the lubrication system.
Solution Approach 2:
The system changes the operational parameters by introducing a lubrication chamber with controlled pressure. The auxiliary reciprocating piston creates pressure differential that prevents medium leakage into the lubrication chamber, enabling higher operational frequencies without the wear limitations of diaphragm systems.
3Duration of action of stationary object
If elastomer seal is used, then wear is reduced, but frequency is limited due to viscoelastic properties
Solution Approach 1:
The viscoelastic elastomer seal is replaced with a mechanical sealing system using the auxiliary reciprocating piston. This substitution eliminates the frequency limitations imposed by viscoelastic properties while maintaining wear resistance through proper lubrication of the sealing surfaces.
Solution Approach 2:
The system changes the material parameter from viscoelastic elastomer to rigid sealing surfaces with mechanical actuation. The auxiliary reciprocating piston creates a lubrication chamber that allows high-frequency operation without the viscoelastic limitations, while the lubricated contact surfaces maintain wear resistance.
4Productivity
If high pressure is generated during conveying stroke, then medium conveyance is achieved, but lubrication of contact surfaces becomes insufficient
Solution Approach 1:
The pump is segmented into separate conveying and lubrication chambers. The auxiliary reciprocating piston creates a lubrication chamber that is pressure-isolated from the high-pressure conveying chamber, allowing contact surfaces to be lubricated at lower pressures while the conveying chamber operates at high pressures for effective medium conveyance.
Solution Approach 2:
The auxiliary reciprocating piston serves as an intermediary that decouples the lubrication function from the conveying function. It creates a lubrication chamber that supplies lubricant to contact surfaces independently of the high-pressure conveying stroke, ensuring continuous lubrication even during high-pressure operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents media leakage into the lubricating medium, maintains lubrication properties, reduces friction, and increases operational frequency, while minimizing wear and extending maintenance intervals.
Implementation Method 1
The auxiliary reciprocating piston is designed for converting a drive movement of the drive into an auxiliary conveying stroke movement and into an auxiliary suctioning stroke movement
Implementation Method 2
the cylinder, the reciprocating piston and the auxiliary reciprocating piston are designed for converting the auxiliary conveying stroke movement into the conveying stroke movement of the reciprocating piston via a lubrication chamber
Data Source
AI summary
A reciprocating piston pump includes a pump module, a drive, and an auxiliary piston. The pump module includes a cylinder head, a cylinder and a piston that form a conveying chamber. The piston converts a drive movement of the drive into conveying and suctioning stroke movements. The auxiliary piston is between the drive and the piston. The cylinder, the piston and the auxiliary piston convert the drive movement into auxiliary conveying and suctioning stroke movements, and convert the auxiliary conveying stroke movement into the conveying stroke movement of the piston via a lubricating medium in a lubricating chamber formed by the cylinder, the piston and the auxiliary piston head. A head surface of the auxiliary piston is smaller than a head surface of the piston, so that, during the auxiliary conveying stroke movement, a pressure in the lubricating chamber is greater than a pressure in the conveying chamber.