Vertically Mounted Stepper Motor Lance Pump
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Solution Overview
Problem
Existing lance pumps lack the ability to provide selectively variable output pressure and are complex to disassemble and assemble, which limits their efficiency in pumping viscous liquids.
Innovation Solution
A pump design featuring a stepper motor-driven elongate core with a reciprocating motion, an inlet check valve for an expansible lower pump chamber, and a lateral passage with a check valve connecting to an annular upper chamber, allowing for variable pressure and efficient pumping of viscous liquids through both up and down strokes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a traditional motor and transmission system is used in lance pumps, then the pump can achieve sufficient power, but the device complexity increases and selective pressure control becomes difficult
Solution Approach 1:
The patent replaces the traditional motor and transmission system with a stepper motor that directly drives the core through vertical reciprocating motion. This substitution eliminates complex mechanical transmissions while providing precise control over the pumping action, thereby reducing device complexity while maintaining adequate power for viscous liquid pumping.
Solution Approach 2:
The stepper motor enables selective control of pumping parameters including stroke frequency and amplitude. By varying the stepper motor's rotational speed and direction, the system can selectively adjust output pressure and flow rate, providing flexible pressure control without requiring complex transmission mechanisms.
2Reliability
If traditional pump designs are used, then the structure is proven reliable, but disassembly and assembly complexity increases
Solution Approach 1:
The pump is divided into distinct modular segments including the pump body, core, check valves, and outlet mechanism. This segmentation allows each component to be independently manufactured, tested, and assembled, reducing overall assembly complexity while maintaining the reliability of proven pump components in their designated positions.
Solution Approach 2:
The patent inverts the traditional pump structure by positioning the motor vertically above the pump chamber rather than horizontally alongside it. This inverted configuration simplifies the drive mechanism and makes the pump more compact, while the core reciprocating motion within the tube maintains the reliable pumping action of traditional designs.
3Device complexity
If a simple pump structure is used, then assembly is easier, but the ability to provide variable output pressure is lost
Solution Approach 1:
The stepper motor provides precise control over the core's reciprocating motion parameters including stroke frequency, amplitude, and direction. By programmatically adjusting these parameters, the system can selectively vary output pressure and flow rate to match different application requirements, adding adaptability without significantly increasing structural complexity.
Solution Approach 2:
The pump transitions from a static, fixed-pressure design to a dynamic system where the stepper motor can continuously adjust pumping parameters in real-time. This dynamic control capability allows the simple pump structure to adapt to varying pressure requirements by modifying the motion characteristics of the core during operation.
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 pump achieves variable output pressure and efficient pumping of viscous liquids by using a stepper motor to control the core's motion and check valves, reducing disassembly complexity and enhancing operational flexibility.
Implementation Method 1
The inlet check valve is oriented to open during each upward pumping stroke permitting viscous liquid to enter the lower pump chamber
Implementation Method 2
The lateral passage has a check valve oriented to open during each downward pumping stroke
Data Source
AI summary
A pump includes a pump body and an elongate tube. The pump includes an elongate core slidably received in the tube, a stepper motor having a selectively rotatable output shaft extending vertically and a transmission for effecting relative reciprocating motion between the core and the tube. The pump includes an inlet check valve mounted inside the core defining with the core an expansible and contractible lower pump chamber. The inlet check valve is oriented to open during each upward pumping stroke. The pump includes an annular upper chamber above the lower pump chamber and a lateral passage connecting the lower pump chamber to the annular upper chamber. The lateral passage has a check valve oriented to open during each downward pumping stroke. The pump includes an outlet passage connected to the annular upper chamber permitting viscous liquid to flow to the outlet passage on each upward and downward pumping stroke.