Screw-In Measuring Connection With Dual-Material Sealing Stop
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Solution Overview
Problem
Existing arrangements for measuring devices and containers face challenges in achieving a stable and cleanable connection, especially when a small adapter is needed for containers with small diameters, as the size reduction of the pressure measurement cell is limited, leading to reduced stability of the sealing element.
Innovation Solution
The sealing element is divided into two sections, with the front section made of chemically resistant thermoplastic plastic (such as PEEK) for sealing and the second section made of metal for providing a defined stop during screwing, ensuring resistance to high pressures without deformation, allowing for a smaller and more stable connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the adapter diameter is minimized for small containers, then the device size is reduced, but the pressure measurement cell size cannot be sufficiently reduced, compromising stability
Solution Approach 1:
The sealing element is divided into two distinct sections: a front section made of chemically resistant thermoplastic plastic (such as PEEK) for sealing, and a second section made of metal for providing a defined stop during screwing. This segmentation allows each section to be optimized for its specific function, enabling stable connections in compact adapters.
Solution Approach 2:
The sealing element combines two different materials (thermoplastic plastic and metal) in a single component. The thermoplastic plastic provides chemical resistance and sealing capability, while the metal section provides structural stability and a defined stop during assembly, achieving both sealing effectiveness and connection stability in a small adapter.
2Reliability
If a PEEK sealing element is used for chemical resistance and stability, then long-term stability is improved, but the wall thickness of the process connection must be at least 3.5 mm, increasing device size
Solution Approach 1:
The sealing element is segmented into a front sealing section and a rear structural section. The front section made of thermoplastic plastic provides the necessary chemical resistance and sealing function with minimal thickness, while the metal second section provides the required structural stability and defined stop, eliminating the need for thick process connection walls.
Solution Approach 2:
Different sections of the sealing element have different material properties optimized for their local functions. The front section has soft, chemically resistant material for sealing, while the second section has hard, structurally stable material for mechanical support. This local differentiation allows the process connection wall thickness to be reduced below 3.5 mm while maintaining both sealing and structural requirements.
3Reliability
If higher screw-in torque is applied to ensure sealing, then sealing effectiveness is improved, but the sealing element may deform or relax, compromising long-term stability
Solution Approach 1:
The sealing element is divided into a front sealing section and a second section that extends into the process connection. The second section acts as a reinforcement that prevents deformation and relaxation under high screw-in torque, while the front section maintains sealing effectiveness. This segmentation allows high torque application without compromising long-term sealing stability.
Solution Approach 2:
The combination of thermoplastic plastic and metal in the sealing element creates a composite structure where the metal second section provides high mechanical strength and resistance to deformation under torque, while the thermoplastic front section maintains sealing properties. This composite construction enables higher screw-in torque to be applied without causing sealing element deformation or relaxation.
Data Source
AI summary
The invention relates to an arrangement composed of a measuring device and a container, wherein the measuring device (1) is suited for insertion into the container, which contains the medium to be measured, and wherein the container for receiving the measuring device (1) has a connector piece (20) having a passage opening extending in an axial direction and a seal land (22) projecting into the passage opening, wherein the measuring device (1) comprises a rotationally symmetric housing part (10), which is flush with the connector piece (20) and has an external cone portion (11), which forms with an internal cone portion (21) provided on the connector piece (20) a beveled sealing surface pair. According to the invention, the sealing element in the region of the external and internal cone portions (11, 21) consists in the front end section, which faces the medium, at least partially of a plastic, especially PEEK, or an elastomer and consists in the adjoining second section (32), facing away from the medium, of metal or ceramic or a fiber-reinforced plastic so that a defined and thus pressure- and force-resistant stop results in the axial direction between the external cone portion (11) of the measuring device (1) and the internal cone portion (21) of the connector piece (20), while independently thereof the sealing function is achieved exclusively in the front end section (31), facing the medium, of the sealing element (30).