Electric Valve Housing Seal Structure 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 stator assembly, rotor, sleeve, and a case with a separate housing and cover, where a seal ring is compressed between the housing and cover, and the cover is fixedly connected to the housing via welding, creating a simple and effective sealing structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circuit board assembly is sealed to prevent corrosion, then reliability is improved, but device complexity increases
Solution Approach 1:
The case is divided into housing and cover that are separately formed, allowing independent manufacturing and assembly. The seal ring is positioned at the connection between housing and cover, creating a dedicated sealing zone that isolates the circuit board assembly without requiring complex integrated sealing structures throughout the entire device.
Solution Approach 2:
A seal ring is introduced as an intermediary component between the housing and cover to prevent corrosion of the circuit board assembly. This simple sealing element effectively isolates the circuit board from corrosive environments without requiring complex sealing mechanisms or integrated designs.
2Reliability
If the housing and cover are separately formed and welded, then sealing reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The case is segmented into housing and cover that can be manufactured separately using standard molding processes. This segmentation allows each component to be optimized for its specific manufacturing requirements while maintaining overall sealing reliability through the welded connection and seal ring at the interface.
Solution Approach 2:
The housing and cover are joined through welding to create a unified sealed enclosure. This merging of separately manufactured components achieves reliable sealing while preserving the manufacturing advantages of separate formation, including easier molding and assembly flexibility.
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, preventing corrosion and ensuring the structural simplicity and reliability of the electric valve, particularly in refrigeration systems.
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
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Disclosed is an electric valve (100), comprising a stator assembly (10), a rotor (20), a circuit board assembly (30), a sleeve (40) 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 (51) 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 (80). The circuit board assembly is arranged in the box body. The box body comprises a shell (1) and a cover body (2). A seal ring (3) 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. Such an electric valve has a simple structure and improves the sealing reliability of the circuit board assembly.