Diaphragm Fastening via Hook Coupling in Metering Pumps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solutions for connecting the diaphragm assembly to the tie rod in metering pumps are complex, require specialized tools, and can lead to damage during assembly, while also being prone to corrosion and requiring additional components.
Innovation Solution
A secure connection between the diaphragm assembly and the tie rod is achieved using a hook coupling, plug-in coupling, or a particular clamping connection, which allows for easy angular positioning of the diaphragm and minimizes the risk of damage during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded extension is screwed into the tie rod to connect the diaphragm assembly, then the connection is secure, but the assembly process becomes complex and requires specialized tools
Solution Approach 1:
The patent introduces a coupling piece as an intermediary component between the diaphragm assembly and the tie rod. This coupling piece features a recess that receives the tie rod and a protrusion that engages with the diaphragm assembly, replacing the complex threaded connection with a simple insert-and-lock mechanism that maintains security while eliminating assembly complexity
Solution Approach 2:
The invention extracts the threading mechanism from the connection system and replaces it with a simplified coupling structure. The threaded extension is removed entirely, and instead a coupling piece with geometric interlocking features is used, which achieves secure connection without requiring threads or specialized assembly tools
2Strength
If a threaded connection is used to fasten the diaphragm assembly to the tie rod, then the connection is strong, but the diaphragm can be damaged during assembly
Solution Approach 1:
The coupling piece serves as a protective intermediary that interfaces with the diaphragm assembly through its protrusion and connects to the tie rod through its recess. This mediator distributes connection forces evenly and eliminates the need for threading operations that could damage the delicate diaphragm structure during assembly
Solution Approach 2:
The coupling piece is pre-configured with the recess and protrusion geometry that enables direct engagement. This preliminary preparation of the connection interface allows the diaphragm assembly to be attached without subjected to damaging threading operations, as the coupling piece already contains the connection geometry needed for secure attachment
3Stability of the object's composition
If a key is used to prevent co-rotation of the tie rod, then rotational stability is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the anti-rotation function into the coupling piece itself through asymmetric geometric features. The recess and protrusion are designed with specific orientation-dependent geometry that inherently prevents co-rotation of the tie rod, eliminating the need for a separate key component while maintaining rotational stability
Solution Approach 2:
The coupling piece employs asymmetric geometry in its recess and protrusion design. This asymmetry creates a directional engagement that naturally prevents rotational movement of the tie rod relative to the diaphragm assembly, achieving rotational stability through the shape itself rather than through additional symmetric components like keys
4Duration of action of stationary object
If metal thread pairings are used in aggressive pump environments, then the connection is durable, but corrosion occurs and disassembly becomes difficult
Solution Approach 1:
The invention extracts the metal threading mechanism from the connection system and replaces it with a coupling piece that uses geometric interlocking instead of threaded engagement. This eliminates the metal-to-metal thread pairing that is susceptible to corrosion in aggressive pump environments, while maintaining connection durability through the interlocking recess and protrusion design
Solution Approach 2:
The coupling piece is designed as a simple, replaceable component that can be easily manufactured from corrosion-resistant materials. Rather than relying on durable but corrosion-prone metal threads, the system uses a simpler coupling structure that can be made from materials resistant to aggressive environments and replaced if needed, sacrificing long-term permanence for corrosion resistance
Data Source
AI summary
The present invention relates to a metering pump comprising (i) a diaphragm return device comprising tie rod and (ii) a diaphragm assembly comprising a mechanically driven elastic diaphragm having a flexible region between the clamping surface, which serves to seal the delivery chamber, at the periphery of the diaphragm and a diaphragm core which serves for force transmission, pressure generation and for connection to the tie rod, characterized in that the diaphragm assembly and the tie rod are connected by means of a hook coupling, or a plug-in coupling, or a clamping connection.