Pressure Sensor Assembly With Stress-Isolating Welded Connector
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Solution Overview
Problem
Existing pressure sensors face measurement inaccuracies due to assembly stress transmitted from the pressure interface to the diaphragm when connected to pipes or containers.
Innovation Solution
A pressure measurement assembly with a longitudinally extending pressure channel and a pressure sensitive head, featuring a recessed connecting tube and elastic diaphragm, along with a split structure that isolates assembly stress through welding and a flange-supported connecting tube, and a pressure sensor with a housing and signal processing assembly that includes flexible plates and conductive connections for stress isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pressure diaphragm is integrally connected with the pressure interface, then the manufacturing process is simplified, but assembly stress is transmitted to the pressure diaphragm causing measurement deviation
Solution Approach 1:
The pressure measurement assembly is divided into separate components: the pressure interface (connector) and the pressure sensitive head (containing the diaphragm). This segmentation prevents assembly stress from being transmitted to the diaphragm while maintaining manufacturing efficiency through modular assembly.
Solution Approach 2:
A pressure channel serves as an intermediary element between the pressure interface and the pressure diaphragm. This channel transmits pressure fluid while isolating the diaphragm from mechanical assembly stress, resolving the contradiction between simplified manufacturing and measurement precision.
2Device complexity
If the pressure interface is directly connected to the pressure diaphragm, then the device structure is compact, but assembly stress causes measurement deviation
Solution Approach 1:
The device is segmented into a connector portion and a sensor portion, connected through a pressure channel. This segmentation maintains relative structural simplicity while preventing stress transmission that would compromise measurement precision.
Solution Approach 2:
The pressure diaphragm is extracted from direct connection with the pressure interface and placed in a separate pressure sensitive head. This extraction eliminates the harmful stress transmission path while maintaining a compact overall structure through careful component arrangement.
3Strength
If welding is performed directly on the pressure diaphragm assembly, then the connection is strong, but welding slag interferes with the sensing cavity
Solution Approach 1:
The welding operation is performed on the connector portion separate from the pressure sensitive head containing the sensing cavity. This spatial segmentation allows strong welding connections while preventing welding slag from contaminating the sensing cavity.
Solution Approach 2:
The pressure channel acts as an intermediary barrier between the welding zone and the sensing cavity. This allows strong welded connections in the connector while the pressure channel prevents welding slag from reaching and interfering with the sensing cavity.
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
Improves measurement accuracy by isolating assembly stress, facilitating easy installation and reducing welding slag interference, while allowing for compact design and efficient signal processing.
Implementation Method 1
A longitudinal proximal side of the pressure sensitive head is correspondingly formed with an elastic diaphragm
Implementation Method 2
setting a Wheatstone bridge consisting of a strain gauge or thick film piezoresistors on the other surface
Data Source
AI summary
A pressure measurement assembly includes a pressure connector provided with a pressure channel extending longitudinally and a pressure sensitive head. The longitudinal distal side of the pressure sensitive head is recessed inward to form a connecting tube with a sensing cavity facing the distal end, and the longitudinal proximal side of the pressure sensitive head is correspondingly formed with an elastic diaphragm. The longitudinal proximal side of the elastic diaphragm is provided with a pressure measurement circuit, and the proximal end of the connecting tube is sealed and connected to the pressure connector so that the proximal end of the pressure channel is in fluid communication with the sensing cavity. The proximal end of the connecting tube is welded to the pressure connector.