Valve Spring Fixing Structure to Prevent Rotation and Box Stress
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Solution Overview
Problem
The existing valve spring fixing devices in plunger pumps face challenges with inconvenient installation, stress concentration leading to potential rupture of the valve box, and poor spring fixing efficiency due to rotation within the annular groove, which reduces the service life and performance of the valve assembly.
Innovation Solution
A valve spring fixing device with a cylindrical hollow structure, including a spring mounting portion and notches for fluid flow, which eliminates the need for a groove in the valve box, reducing stress concentration and providing a stable fixing effect, thus improving the installation process and performance by preventing rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If annular grooves are used to fix the valve spring, then the valve spring can be mounted, but stress concentration occurs leading to potential rupture of the valve box
Solution Approach 1:
The patent extracts the harmful annular groove structure from the valve box and relocates the fixing function to a dedicated valve spring fixing device with notches. This removes the stress concentration source from the valve box while maintaining the spring mounting capability through the fixing device's notched structure.
Solution Approach 2:
The patent segments the fixing function from the valve box structure by introducing a separate valve spring fixing device. This device includes a body portion with notches that provide fixing points, separating the mounting function from the pressure-containing valve box structure and eliminating stress concentration in the valve box.
2Reliability
If annular grooves are used to fix the valve spring, then the spring can be mounted, but the fixing device allows rotation reducing service life
Solution Approach 1:
The patent employs asymmetric notched structures in the valve spring fixing device that prevent rotation. The notches are positioned and shaped to provide directional fixing, creating an asymmetric configuration that locks the spring in place and eliminates rotational movement, thereby extending service life.
3Reliability
If annular grooves are cut in the valve box to fix the spring, then the spring can be mounted, but installation becomes inconvenient and complex
Solution Approach 1:
The patent incorporates the notched fixing structure into a pre-manufactured valve spring fixing device body. The notches are created during device manufacturing rather than requiring post-installation groove cutting in the valve box. This preliminary preparation of the fixing structure simplifies installation and eliminates complex machining operations.
4Reliability
If grooves are added to the valve box for spring fixing, then the spring can be secured, but the device complexity increases
Solution Approach 1:
The patent segments the fixing function into a separate valve spring fixing device with integrated notches. This eliminates the need to modify the valve box structure with grooves, maintaining the valve box's simple pressure-containing geometry while providing the fixing function through the dedicated fixing device.
Solution Approach 2:
The valve spring fixing device combines multiple functions: it provides the mounting structure for the spring, includes notches for secure positioning, and serves as the fixing mechanism itself. This multi-functional integration eliminates the need for separate fixing components and valve box modifications.
Data Source
AI summary
A valve spring fixing device and a plunger pump are disclosed. The valve spring fixing device includes a spring fixing piece, which includes a first supporting surface and a second supporting surface located at two ends of the spring fixing piece, and an intermediate portion located between the first supporting surface and the second supporting surface; and a spring mounting portion connected with the intermediate portion and configured to mount a valve spring, the first supporting surface and the second supporting surface are configured to contact with a valve box to fix the valve spring fixing device.