Coaxial Linear Pump Drive for High-Pressure Fluid Dispensing
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Solution Overview
Problem
Existing fluid displacement systems, particularly in spray and plural component dispensing systems, face challenges in efficiently converting rotational motion from electric motors into linear reciprocating motion for fluid pumping, especially in applications requiring high pressure and precise control, such as multiple component applicators for materials like epoxies and polyurethanes.
Innovation Solution
A pumping assembly that includes a motor with a stator and rotor, a drive mechanism to convert rotational output into linear input, and a frame supporting the motor, which is connected to a displacement pump to achieve efficient fluid pumping, with features like a bearing assembly to manage axial loads and a clocking member to prevent rotation, ensuring precise and high-pressure fluid delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a gear reduction system is used to increase torque and reduce speed, then the motor can effectively drive the pump, but the device complexity increases
Solution Approach 1:
The patent removes the gear reduction system from the drive train, directly coupling the electric motor to the reciprocating pump. This extraction of the intermediate mechanical transmission components simplifies the overall device structure while maintaining effective torque delivery through direct motor-pump coupling.
Solution Approach 2:
The patent replaces the mechanical gear reduction system with an electrically controlled motor that directly drives the pump. This substitution eliminates complex mechanical transmission elements while achieving the same functional outcome of delivering adequate torque to the pump through direct electric motor coupling.
2Ease of operation
If a reciprocating drive mechanism is used to convert rotational motion to linear motion, then fluid pumping is enabled, but the device complexity increases
Solution Approach 1:
The patent merges the motor housing and pump housing into a single integrated assembly, where the motor's rotational output is directly coupled to the pump's reciprocating mechanism. This consolidation eliminates separate drive shafts, couplings, and intermediate transmission components, reducing device complexity while maintaining pumping functionality.
Solution Approach 2:
The motor housing serves multiple functions: it contains the motor components, provides structural support, and directly interfaces with the pump mechanism. This multi-functionality eliminates the need for separate drive train components, simplifying the overall device structure while enabling fluid pumping.
3Manufacturing precision
If separate component materials are routed separately through positive displacement pumps, then mixing precision is improved, but the device complexity increases
Solution Approach 1:
The patent uses two separate positive displacement pumps (first pump for first component material, second pump for second component material) that operate independently but are synchronized to deliver precise mixing ratios. This segmentation allows each pump to be optimized for its specific material while maintaining precise mixing control through coordinated operation.
Solution Approach 2:
The system incorporates feedback control mechanisms that monitor the output of each pump and adjust their operation to maintain precise mixing ratios. This feedback ensures that despite variations in material viscosity or pump wear, the mixing precision is maintained while the separate pump architecture remains manageable.
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 enables efficient conversion of rotational motion to linear motion, allowing for high-pressure fluid pumping and precise control, suitable for applications like multiple component applicators, achieving effective mixing and application of materials like epoxies and polyurethanes.
Implementation Method 1
a bearing assembly connected to the rotor and configured to transmit axial forces to the pump frame
Implementation Method 2
a drive mechanism connected to the rotor, the drive mechanism configured to receive a rotational output from the rotor and convert the rotational output into a linear input along the pump axis
Data Source
AI summary
A pumping assembly comprises: a motor (24) including a stator and a rotor, the rotor configured to rotate relative the stator on a pump axis (PA); a drive mechanism (24) connected to the rotor, the drive mechanism (24) configured to receive a rotational output from the rotor and convert the rotational output into a linear input along the pump axis to cause pumping of the fluid; and a piston (34) connected to the drive mechanism (26) to receive the linear input and disposed coaxially with the drive mechanism (26) and the rotor, wherein the piston (34) is configured to reciprocate axially along the pump axis to pump fluid.