Lance Pump Stepper Motor Variable Pressure Control
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Solution Overview
Problem
Existing lance pumps lack the ability to provide selectively variable output pressure and often require complex reduction gearing, which increases cost and complexity.
Innovation Solution
A pump design featuring a stepper motor-driven elongate tube with an expansible and contractible chamber system, allowing for variable pressure control through reciprocating motion and check valves, eliminating the need for complicated gearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional lance pumps use complex reduction gearing to achieve variable pressure, then pressure control capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the traditional mechanical reduction gearing system with an electric motor (stepper or servo motor) that directly drives the pump tube. This substitution eliminates complex mechanical transmission components while achieving precise variable pressure control through electronic speed and torque regulation of the motor, directly resolving the contradiction between pressure control capability and device complexity
Solution Approach 2:
The patent achieves variable pressure control by changing the operational parameters of the electric motor (rotation speed, acceleration, deceleration) rather than using mechanical gear ratios. The controller adjusts motor parameters dynamically to regulate pump tube reciprocation speed and force, thereby controlling output pressure without any mechanical reduction gearing
2Force
If traditional lance pumps use reduction gearing for torque multiplication, then force output is improved, but device complexity increases
Solution Approach 1:
The patent substitutes electric motor torque output for mechanical gear torque multiplication. The stepper or servo motor inherently provides high starting torque and controlled force output without requiring any gear train, directly eliminating transmission complexity while maintaining or improving force output capability
3Productivity
If lance pumps use reciprocating motion for pumping viscous liquid, then pumping effectiveness is improved, but pressure variability capability worsens
Solution Approach 1:
The patent makes the reciprocating pump tube dynamic and controllable by directly coupling it to an electric motor with variable speed and torque characteristics. The pump tube's reciprocation parameters (speed, force, timing) are dynamically adjusted through motor control, enabling both effective viscous liquid pumping and variable pressure output simultaneously
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 reliable operation with variable pressure and flow rate, reducing complexity and cost by eliminating the need for reduction gearing, while effectively pumping viscous liquids like grease.
Implementation Method 1
The inlet check valve is oriented to open during each downward pumping stroke of the tube permitting viscous liquid to enter the lower end chamber
Implementation Method 2
A stepper motor mounted on the body has a selectively rotatable output shaft extending horizontally above the liquid in the reservoir when the body is in position
Implementation Method 3
An inlet check valve mounted inside the tube below the lower end of the core defines with the lower end of the core an expansible and contractible lower end chamber
Data Source
AI summary
A pump for pumping viscous liquid. The pump includes a body, an elongate core, and a tube surrounding the core. A stepper or servo motor mounted on the body has a selectively rotatable output shaft. A transmission operatively connecting the motor output shaft and the elongate tube reciprocates the tube between a raised position and a lowered position. An inlet check valve defining an expansible lower chamber is oriented to open during each downward pumping stroke so liquid enters the lower chamber. The pump includes a pump chamber and a feed passage connecting the lower chamber to the pump chamber. The passage has a check valve oriented to open during each upward stroke to deliver liquid from the lower chamber to the pump chamber. An outlet passage connected to the pump chamber permits liquid to flow from the pump chamber to an outlet on each upward and downward stroke.