Electric Valve Housing Weld Seal for PCB Corrosion Protection
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Solution Overview
Problem
Existing electric valves face challenges in effectively sealing the circuit board assembly, which is crucial to prevent corrosion and ensure reliable operation.
Innovation Solution
The electric valve design includes a case with a housing and a cover that are separately formed and connected by welding, utilizing a seal ring to create a sealing structure that isolates the stator assembly from the rotor, thereby improving the sealing reliability of the circuit board assembly without requiring additional soldering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing and cover are integrally formed, then the manufacturing process is simpler, but the sealing reliability of the circuit board assembly deteriorates
Solution Approach 1:
The housing is divided into two separate parts (housing and cover) that are formed independently through molding processes. This segmentation allows each part to be optimized for its specific function while maintaining ease of manufacture through standard molding techniques.
Solution Approach 2:
The separately formed housing and cover are joined together through welding to create a unified sealed enclosure. This merging of components achieves the sealing reliability needed to protect the circuit board assembly while still benefiting from the manufacturing advantages of separate formation.
2Reliability
If additional sealing components are added to improve sealing, then the sealing reliability improves, but the device complexity increases
Solution Approach 1:
The sealing function is integrated into the welding process that joins the housing and cover, rather than adding separate sealing components. The weld itself creates the seal, combining the joining and sealing functions into a single operation.
Solution Approach 2:
The welding process automatically provides both the mechanical connection and the sealing function simultaneously. The seal ring and welding operation work together where the welding creates both the structural joint and the corrosion barrier without requiring additional dedicated sealing components.
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 enhances the sealing reliability of the circuit board assembly, simplifies the structure and manufacturing process, and prevents corrosion, ensuring the electric valve's operational integrity.
Implementation Method 1
a seal ring is provided at a connection of the housing and the cover, the seal ring is tightly compressed between the housing and the cover
Implementation Method 2
the cover is fixedly connected with the housing by welding
Data Source
AI summary
An electric valve includes a stator assembly, a rotor, a circuit board assembly, a sleeve and a valve assembly. The stator assembly is arranged around the rotor. The sleeve isolates the stator assembly from the rotor. The stator assembly is electrically connected to the circuit board assembly. A valve port is formed in the electric valve. The rotor can drive the movement of the valve assembly with respect to the valve port. The electric valve further comprises a box body. The circuit board assembly is arranged in the box body. The box body includes a shell and a cover body. A seal ring is arranged at a joint of the shell and the cover body. The seal ring is compressed between the shell and the cover body. The cover body is fixedly connected to the shell by means of welding.