Fluid Control Device Frustoconical Sealing Mechanism
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Solution Overview
Problem
Existing fluid measuring and control devices face challenges in achieving a sealed and compact design that can withstand environmental impacts such as dust and water immersion, particularly in protection ratings IP65 and IP67, due to inadequate sealing mechanisms.
Innovation Solution
A compact fluid measuring or fluid control device with a housing comprising two parts connected by a screwed mechanism featuring frustoconical surfaces that displace laterally to apply a clamping force on an elastic seal, ensuring a sealed connection and reproducible clamping force for multiple assembly and disassembly cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealed connection between housing parts is achieved using conventional screwed connections, then protection against environmental impacts is improved, but the device complexity and manufacturing precision requirements increase
Solution Approach 1:
The patent employs frustoconical surfaces instead of conventional cylindrical or planar sealing surfaces. The conical geometry of the screw shank and the matching conical surface on the opening edge create a wedge-shaped sealing mechanism that transforms rotational tightening motion into lateral displacement, ensuring uniform sealing pressure distribution and reliable environmental protection without complex additional components
Solution Approach 2:
The invention introduces a lateral displacement dimension to the conventional axial tightening motion. The frustoconical surfaces convert the axial screwing motion into lateral movement of the second housing part relative to the first, creating a new degree of freedom that enables the sealing surfaces to come into intimate contact while maintaining alignment, thus achieving reliable sealing without excessive complexity
2Reliability
If a sealed connection is achieved using conventional screwed connections, then protection rating is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes asymmetric frustoconical surfaces with specific inclination angles (e.g., 30°) rather than symmetric cylindrical or planar surfaces. This asymmetric geometry provides self-aligning characteristics during the tightening process, where the conical surfaces guide the lateral displacement and ensure proper alignment of the openings automatically, reducing the need for high manufacturing precision while maintaining reliable sealing
3Reliability
If housing parts are connected with sufficient clamping force for sealing, then protection rating is improved, but ease of operation for maintenance decreases
Solution Approach 1:
The invention creates a dynamic sealing mechanism where the clamping force is applied through lateral displacement rather than direct axial compression. The frustoconical surfaces enable the housing parts to move laterally relative to each other during tightening, and this dynamic motion ensures uniform sealing pressure distribution. For disassembly, loosening the screw allows the lateral displacement to reverse automatically, making the operation easy without compromising the sealed connection during use
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 provides a reliable, dustproof, and watertight connection that meets IP65 and IP67 protection ratings, allowing for easy maintenance and repeated use while maintaining a sealed environment.
Implementation Method 1
The frustoconical surfaces slide against each other such that the second housing part is displaced in a displacement direction in a direction towards the first housing part
Implementation Method 2
the resting face presses against and elastically deforms the seal
Data Source
AI summary
A fluid measuring or fluid control device has a housing the housing parts of which are fastened to each other by at least one screwed connection, in which a screw engages through an opening in a peripheral wall of the first housing part and is screwed into a threaded opening in the second housing part. An elastic seal is arranged between the housing parts. The first housing part has a first resting face, and the second housing part has a second resting face which are both in peripherally circumferential contact with the seal. The screw shank and an edge of the opening have cooperating frustoconical surfaces which are oriented such that the second housing part is displaced in the direction towards the first housing part when the screw is screwed into the threaded opening, the resting faces coming into contact with the seal.