External-Rotor Pump Drive for High-Pressure Reciprocating Pumps
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Solution Overview
Problem
Existing fluid displacement systems, such as those used in fluid dispensing systems, face inefficiencies in converting rotational motion from electric motors to linear, reciprocating motion for fluid displacement pumps, particularly in applications requiring high pumping pressures.
Innovation Solution
A drive system for reciprocating fluid displacement pumps utilizing an electric motor with an eccentric driver, where the rotor is disposed outside the stator, converting rotational output to linear, reciprocating input through a drive mechanism, and supported by a frame that stabilizes the stator and cylinder relative to the piston, enabling high-pressure fluid pumping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a gear reduction system is used to increase motor torque, then the pumping pressure capability is improved, but the device complexity increases
Solution Approach 1:
The patent removes the gear reduction system from the drive mechanism, directly coupling the motor rotor to the pump rod through a simplified eccentric-driven reciprocating mechanism. This extraction of the complex gear system resolves the technical contradiction by achieving high pumping pressure through direct motor action rather than mechanical multiplication, thereby reducing device complexity while maintaining pressure capability.
Solution Approach 2:
The patent replaces the traditional mechanical gear reduction system with an electromagnetic direct-drive mechanism where the motor's electromagnetic field directly actuates the reciprocating pump rod through an eccentric configuration. This substitution eliminates complex mechanical transmission components while achieving the same torque multiplication effect through direct electromagnetic-to-mechanical energy conversion.
2Volume of moving object
If the rotor is disposed inside the stator, then the motor structure is compact, but the conversion of rotational motion to linear reciprocating motion becomes less efficient
Solution Approach 1:
The patent inverts the conventional motor configuration by placing the rotor outside the stator rather than inside. This inverted arrangement allows the rotor to directly drive the reciprocating mechanism through an eccentric connection, improving the efficiency of rotational-to-linear motion conversion while maintaining a compact overall structure through the direct coupling design.
3Ease of manufacture
If a traditional pump drive system is used, then the components are well-established, but the system stability under high load conditions deteriorates
Solution Approach 1:
The patent merges the motor housing and pump housing into a single integrated pump frame structure. This consolidation creates a rigid, unified support structure that enhances system stability under high load conditions by eliminating relative movement and vibration between separate motor and pump assemblies, while still using standard, well-established component types for ease of manufacture.
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 system efficiently converts rotational motion to linear reciprocating motion, achieving high fluid pumping pressures suitable for atomizing fluids into sprays, supporting the motor and pump components, and allowing for stable operation under load.
Implementation Method 1
The electric motor includes a stator and a rotor. The stator and rotor are disposed on an axis.
Implementation Method 2
The drive converts the rotational output to a linear, reciprocating input to the fluid displacement member.
Data Source
AI summary
A drive system for a fluid displacement pump includes an electric motor, a drive coupled to the rotor at a first end of the electric motor, a pump including a fluid displacement member mechanically coupled to the drive, and a controller configured to control a level of power to the electric motor based on a pressure setting set by a user. The electric motor includes a stator and a rotor disposed on an axis. The drive coupled to the rotor converts the rotational output to a linear, reciprocating input to power a pump.