Sensor Unit Clamping Structure for Compact Automation Housings
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Solution Overview
Problem
Field devices in automation technology face challenges in securely fastening sensor units to housings with limited space, particularly when the available fastening area is restricted by the need for a sealing element and the requirement for high tensile strength screws, which are not feasible in all orientations and configurations.
Innovation Solution
A clamping bracket system with a screw that allows for adjustable offset and a clamping angle section that radially presses onto the sensor unit, providing secure locking without the need for large screws, and includes anti-loss devices to prevent removal, utilizing a pin-shaped element or separate pin for securement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a screw of sufficient tensile strength (e.g., M6 or larger) is used to fasten the sensor unit to the housing, then the sensor unit can be securely locked, but the required fastening area becomes too large for short housings or confined spaces
Solution Approach 1:
The clamping bracket redirects the axial clamping force from the screw into radial clamping force through its angled geometry. This dimensional transformation allows the fastening system to achieve high securing strength in the radial direction while maintaining a compact axial footprint, enabling secure fastening in confined spaces where large screws cannot be accommodated
Solution Approach 2:
The clamping bracket serves as an intermediary mechanical element between the screw and the sensor unit. It translates the relatively small axial force from a compact screw into a much larger radial clamping force on the sensor unit, achieving secure fastening without requiring the screw itself to have high tensile strength or require large fastening area
2Adaptability or versatility
If the sensor unit is made accessible from multiple directions for flexible orientation, then installation flexibility is improved, but the housing structure becomes more complex
Solution Approach 1:
The guide rail is designed with universal fastening capability at multiple locations (front, rear, and side walls), allowing the sensor unit to be securely mounted in various orientations. This multi-functional design enables the same basic housing structure to accommodate different installation requirements without adding complex specialized components for each orientation scenario
3Area of stationary object
If the mounting area is located between the sealing element and the guide opening to maximize space utilization, then space efficiency is improved, but the available area for both mounting and sealing becomes severely limited
Solution Approach 1:
The fastening function is segmented into two independent components: the screw provides axial clamping force, while the clamping bracket provides radial clamping force on the sensor unit. This segmentation allows the mounting area to be compact while maintaining reliable sealing, as the sealing element can be positioned independently without interfering with the segmented fastening mechanism
Data Source
Figure 1~2b
Figure 3a~5
AI summary
The invention relates to an automation field device having a housing (1), comprising a channel-type guiding element (2) for receiving a sensor unit (3) of the field appliance, which is sensitive to a process variable of a medium, the sensor unit (3) protruding out of the housing (1) through an end opening (21) of the guiding element (2). According to the invention, a clamping angle (4) and a screw (5) are built into the housing (1), in a region of the housing (1) which is adjacent to the opening (21) of the guiding element (2), the clamping angle (4) in the housing (1) can be moved by means of the screw (5) by a predefinable measure towards the sensor unit (3), and the clamping angle (4) moved in the direction of the sensor unit (3) is embodied so as to press with a first clamping angle section (41) of the clamping angle (4) substantially radially on a clamping region (31) of the sensor unit (3), which is arranged in the housing (1) and faces the opening (21) of the guiding element (2).