Control Valve Fastening Structure for Compact Resin Assembly
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Solution Overview
Problem
Existing control valves face challenges in downsizing due to the limitations imposed by screw-based fastening methods, which restrict the miniaturization of the cylinder and lead to potential fluid leakage issues due to stress and creep phenomena in resin materials.
Innovation Solution
The control valve employs a fastening member that sandwiches first and second flanges on the main body block and cylinder, respectively, and uses a fixing pin to secure the assembly, eliminating the need for screw members and allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a screw member is used to fasten the cylinder and main body block, then the fastening strength is sufficient, but the device size increases due to the need for head portion space and additional plates or nuts
Solution Approach 1:
The patent extracts and eliminates the screw member from the fastening system, replacing it with an integrated recess structure in the cylinder bottom that directly receives and secures the main body block, thereby removing the need for head portion space and additional fastening components
Solution Approach 2:
The patent merges the fastening function into the cylinder structure itself by forming a recess portion directly in the cylinder bottom that accommodates the main body block, combining the cylinder and fastening mechanism into a single integrated structure
2Strength
If screw members are used to fasten resin drive block and resin flow path block, then the connection is secure, but stress is applied to the entire portion causing creep phenomenon and distortion over time
Solution Approach 1:
The patent removes the screw member that causes widespread stress distribution in resin components, replacing it with a localized recess structure that eliminates the need for threaded fastening in resin materials
Solution Approach 2:
The patent uses a simple recess structure instead of complex screw fastening systems, creating a permanent integrated connection that avoids the creep and distortion issues associated with screw-fastened resin components
Data Source
AI summary
The disclosure includes a main body block 11 forming a primary-side flow path to which a fluid is supplied and a secondary-side flow path to which the fluid is discharged; a square cylinder 12 which is attached to the main body block 11 and assembles a valve drive mechanism and whose end surface is a rectangular cross-section; a valve member arranged between the main body block 11 and the cylinder 12; a fastening member 62 fastening the main body block 11 and the cylinder 12 by sandwiching a first flange provided in the main body block 11 and a second flange provided in the cylinder 12; and a fixing pin 74 communicating with a communication hole 72, which is formed in the fastening member 62, and press-fitted into the communication hole 72 and an attachment hole 71 formed at a corner portion of the cylinder 12.