Linear Plunger Pump Hydraulic End to Prevent Valve Box Cracking
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Solution Overview
Problem
The existing plunger pumps used in fracturing technology face issues with cracking and water leakage due to stress concentration at the intersecting line within the valve box, leading to frequent replacements and increased maintenance costs.
Innovation Solution
A plunger and hydraulic end design that eliminates the intersecting line in the valve box by using a linear plunger pump configuration with a flow channel and valve assembly, allowing fluid to flow in and out without reversing, thereby reducing stress concentration and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional plunger pump with reciprocating motion is used, then high rated pressure and compact structure are achieved, but stress concentration occurs at the intersecting line in the valve box leading to cracking and water leakage
Solution Approach 1:
The patent inverts the conventional reciprocating motion mechanism by using linear motion directly. Instead of having the plunger reciprocate back and forth causing alternating pressure in the valve box, the linear motion design eliminates the return stroke, thereby eliminating the intersecting line stress concentration that leads to cracking and water leakage in the valve box.
Solution Approach 2:
The patent extracts and eliminates the problematic reciprocating motion component from the system. By removing the back-and-forth motion and replacing it with unidirectional linear motion, the design takes out the source of stress concentration at the valve box intersecting lines, preventing cracking and improving reliability.
2Productivity
If reciprocating motion plunger is used, then fluid can be pressurized, but frequent maintenance and replacement are required due to cracking and water leakage
Solution Approach 1:
By inverting from reciprocating motion to linear motion, the patent eliminates the alternating pressure cycles that cause fatigue cracking. This inversion fundamentally changes the stress pattern in the valve box, reducing maintenance frequency and extending service life.
Solution Approach 2:
The linear motion design enables continuous unidirectional fluid pressurization without the interruption and stress reversal inherent in reciprocating motion. This continuity of useful action reduces wear and cracking, thereby extending service life and reducing maintenance time.
3Reliability
If valve box with intersecting line is used, then fluid flow control is achieved, but water leakage occurs due to cracking at stress concentration points
Solution Approach 1:
The patent takes out the intersecting line structure from the valve box design by implementing linear motion. This extraction removes the stress concentration points where cracking initiates, thereby preventing water leakage and improving sealing performance.
Solution Approach 2:
By inverting the motion pattern from reciprocating to linear, the patent changes the pressure application method on the valve box. This inversion eliminates the alternating stress that causes cracking at intersecting lines, preventing water leakage.
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
The solution enhances the durability and service life of the plunger pump, reduces maintenance costs, and improves efficiency by preventing cracking and water leakage, leading to a more reliable and cost-effective operation.
Implementation Method 1
a first spring seat detachably connected to the second end portion and including a first spring; a first valve seat at the first opening and including a first intermediate hole; and a first valve body, wherein one end of the first valve body is arranged in contact with the first spring seat
Data Source
AI summary
A plunger, a hydraulic end and a plunger pump are disclosed. The plunger includes a plunger body, the plunger body includes a flow channel; a first liquid inlet hole is located in the plunger body and passes through the sidewall of the plunger body; the plunger body includes a first end portion and a second end portion, a flow channel extends from the first end portion to the second end portion, a part of the flow channel close to the first end portion is closed, the flow channel extends to the second end portion and forms a first opening, the first liquid inlet hole is communicated with the flow channel, the first valve assembly is located at the first opening, and is configured to allow fluid to flow out from the flow channel at the first opening and prevent fluid from flowing back to the flow channel from outside.