Multi-part Slide Element Seal for Pneumatic Pump
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Solution Overview
Problem
Pneumatically operated hydraulic pumps face downtime issues due to reduced lubrication on outer seals, leading to unsatisfactory reversal in pneumatic control parts, as lubricating grease is compressed out by air and depleted over time.
Innovation Solution
A multi-part slide element with C-shaped or V-shaped plastic sealing ring elements, which act as outer seals, providing a reliable seal and accumulating lubricant, and made from PTFE or coated with it for low friction, ensuring consistent operation without jerks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional one-piece slide elements with external O-ring seals are used, then the structure is simple and easy to manufacture, but the lubricating grease is compressed out by air over time leading to increased friction and unsatisfactory reversal
Solution Approach 1:
The slide element is divided into multiple parts: a first slide element part with an external seal, a second slide element part, and a connection element joining them. This segmentation allows the external seal to be separated from the internal lubrication system, preventing grease compression while maintaining sealing functionality.
Solution Approach 2:
The external seal is extracted as a separate component (first slide element part) from the main slide element body. This extraction allows the seal to function independently without being affected by internal lubrication pressure, solving the problem of grease being compressed out.
2Reliability
If multi-part slide elements with separate external seals are used, then lubrication is maintained and reversal is improved, but the device complexity increases
Solution Approach 1:
The first slide element part (external seal) and second slide element part (internal lubrication) are merged into a single integrated slide element assembly connected by a connection element. This merging maintains the benefits of separate sealing while keeping the overall structure compact and manageable.
Solution Approach 2:
The connection element serves multiple functions: mechanically joining the first and second slide element parts, allowing relative movement between them, and maintaining the seal interface. This multi-functionality reduces the need for additional specialized components.
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 multi-part slide element effectively prevents loss of compressed air and lubricant, reducing downtime and ensuring smooth operation by maintaining lubrication and sealing efficiency.
Implementation Method 1
C-shaped or V-shaped plastic sealing ring elements, which act as outer seals, providing a reliable seal and accumulating lubricant
Implementation Method 2
made from PTFE or coated with it for low friction, ensuring consistent operation without jerks
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3
AI summary
In one aspect of the invention, a multi-part slide element (10) with an external seal for a pneumatically operated hydraulic pump is provided. In some exemplary embodiments, the slide element (10) comprises at least a first and a second interconnected piston part (12, 14) and at least one first sealing ring element (A2) made of a non-expandable material and arranged axially between the first and second piston parts (12, 14) as an external seal. In another aspect of the invention, a one-piece slide element with an external seal for a pneumatically operated hydraulic pump is provided, wherein the external seal is formed in and projects from a cylindrical surface of the slide element. In this case, the one-piece slide element and the external seal are made of a non-expandable material.