Reciprocating Pump Drive With Eccentric Motor for High Pressure
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Solution Overview
Problem
Existing fluid displacement systems, such as those used in fluid dispensing systems, face inefficiencies in converting rotational motor output to linear reciprocating motion for fluid pumping, particularly in high-pressure applications like paint spraying, where the torque requirements are high and the systems often lack effective stabilization and control mechanisms.
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 motion through a drive mechanism, and a support frame stabilizes the motor and pump components, enabling high-pressure fluid pumping and efficient fluid spraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a gear reduction system is used to increase motor torque, then the torque output is improved, but the device complexity increases
Solution Approach 1:
The patent removes the gear reduction system from the conventional motor-pump assembly and extracts the torque multiplication function to a separate hydraulic amplifier system. This allows the motor to operate at optimal speeds while the hydraulic amplifier provides the necessary torque multiplication, reducing mechanical complexity while maintaining high torque output capability.
Solution Approach 2:
The patent introduces a hydraulic amplifier as an intermediary component between the motor and the pump. This intermediary uses hydraulic principles to multiply torque while allowing the motor to operate independently at optimal parameters, thereby reducing overall system complexity while achieving high torque requirements.
2Volume of moving object
If the motor and pump are closely coupled, then the space is reduced, but the stabilization and control become difficult
Solution Approach 1:
The patent segments the system into distinct functional modules: motor assembly, hydraulic amplifier, and pump assembly, each mounted on separate portions of the common base plate. This segmentation allows for independent optimization and stabilization of each component while maintaining compact overall arrangement, improving both control and system reliability.
3Stress or pressure
If high torque is required for high-pressure pumping, then the pumping pressure is improved, but the motor speed control becomes less efficient
Solution Approach 1:
The patent replaces direct mechanical coupling with a hydraulic transmission system that uses fluid pressure to transmit power. This substitution allows the motor to operate at controlled speeds while the hydraulic amplifier provides the necessary torque multiplication for high-pressure pumping, decoupling speed control from torque requirements.
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 achieves high fluid pumping pressures up to 69 MPa (10,000 psi) with efficient conversion of rotational to linear motion, stabilizing the motor and pump components, and providing precise control for applications like paint spraying.
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.
Implementation Method 3
The pump includes a piston and a cylinder. The piston receives the linear reciprocating motion from the drive to reciprocate the piston within the cylinder.
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.