Pressure Switch Protective Wall Diverts Contaminants
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Solution Overview
Problem
Existing pressure switches suffer from reduced detection accuracy due to oil droplets, water droplets, and foreign matter colliding directly with the semiconductor pressure sensor, causing defects and inaccuracies in pressure fluid detection.
Innovation Solution
The pressure switch incorporates a joint coupling holder with a protective wall and communication openings that divert the pressure fluid in a bypassing manner, preventing foreign matter from directly impacting the detector, ensuring reliable and stable pressure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor detects pressure through a very small opening in the flow passage, then the pressure detection sensitivity is improved, but foreign matter such as oil droplets, water droplets, and grit can easily enter and collide with the pressure sensor, deteriorating detection accuracy
Solution Approach 1:
A protective wall is introduced as an intermediary structure between the flow passage and the pressure sensor. This protective wall creates a barrier that prevents foreign matter from directly reaching the pressure sensor while still allowing pressure detection to function through the designated opening, thus resolving the contradiction between detection sensitivity and foreign matter protection
Solution Approach 2:
The internal structure of the housing is segmented into distinct functional zones: a flow passage for fluid movement, a detection chamber for pressure sensing, and a protective barrier structure. The protective wall segments the space to create a protected zone around the pressure sensor, allowing the opening to face the flow passage while preventing direct access by contaminants
2Speed
If the pressure sensor is exposed to the flow passage for direct pressure detection, then the detection response speed is improved, but the pressure sensor becomes vulnerable to damage from high-velocity foreign matter
Solution Approach 1:
The protective wall serves as a mediator that allows pressure information to pass through while blocking physical contact between foreign matter and the pressure sensor. This maintains the rapid response capability by keeping the opening exposed to the flow passage while ensuring durability by preventing direct impact
Solution Approach 2:
The protective wall structure provides beforehand protection by creating a physical barrier before foreign matter can reach the pressure sensor. This preemptive protective measure ensures that even when foreign matter is present in the flow, the sensor remains protected from damage
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
This design effectively prevents foreign matter from reaching the detector, maintaining accurate pressure fluid detection even in the presence of contaminants, thereby enhancing the reliability and stability of the pressure switch.
Implementation Method 1
the pressure of the fluid is detected based on a resistance value that changes in accordance with the pressure imposed on the pressure sensor
Data Source
AI summary
In a pressure switch, a joint coupling holder is installed in a case of a housing through an opening, and a joint coupling, to which piping is connected, is connected to the joint coupling holder. The joint coupling holder includes a protective wall therein, which is arranged on a straight line with a detector that is accommodated inside the housing at a central portion of a through hole. In addition, a pressure fluid, which is introduced to the detector through a conduit of the joint coupling, flows in a bypassing manner through a pair of communication openings while averting the protective wall.