Electric Displacement Pump Screw Drive Mechanism
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Solution Overview
Problem
Existing positive displacement pumps rely on mechanical or fluid-operated systems, which can be complex and inefficient, lacking a compact and reliable electrically operated solution for fluid displacement and pumping.
Innovation Solution
An electrically operated displacement pump system utilizing an electric motor with a stator and rotor, coupled with a screw drive mechanism and rolling elements, converts rotational output into linear motion for fluid displacement members, ensuring efficient and compact operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical or fluid-operated systems are used for positive displacement pumping, then the pump can achieve fluid displacement, but the system becomes complex and inefficient
Solution Approach 1:
The patent replaces traditional mechanical or fluid-operated drive systems with an electric motor directly coupled to the screw drive mechanism. This substitution eliminates complex intermediate mechanisms such as gear trains, belts, or fluid couplings, resulting in a simpler, more reliable system with fewer moving parts and lower maintenance requirements while maintaining effective fluid displacement capability
Solution Approach 2:
The electric motor coupled with the screw drive mechanism serves multiple functions simultaneously: it provides rotational motion conversion to linear motion, acts as the primary drive mechanism, and integrates with the pump housing to form a compact unit. This multi-functionality reduces the number of separate components needed, thereby simplifying the overall system while improving reliability
2Power
If traditional drive mechanisms with intermediate gearing are used, then torque can be transmitted to fluid displacement members, but the device size and complexity increase
Solution Approach 1:
The patent extracts and eliminates the intermediate gearing mechanism from the traditional drive system. By using the screw drive mechanism directly coupled to the electric motor, the system achieves torque transmission to the fluid displacement members without requiring bulky gear trains or other intermediate transmission components, thereby significantly reducing the device volume while maintaining adequate power transmission
Solution Approach 2:
The screw drive mechanism converts rotational motion from the motor into linear motion of the fluid displacement members along the screw axis. This dimensional transformation allows for compact integration of the drive mechanism within the pump housing, eliminating the need for extended gear trains or complex spatial arrangements, thus reducing overall device volume while preserving torque transmission capability
3Productivity
If electric motor with screw drive mechanism is used, then the system becomes compact and efficient, but the conversion of rotational to linear motion requires precise mechanism design
Solution Approach 1:
The screw drive mechanism acts as an intermediary element that efficiently converts rotational motion from the electric motor into linear reciprocating motion of the fluid displacement members. This well-established mechanical principle provides a reliable and efficient motion conversion mechanism that is both compact and manufacturable, achieving high pumping efficiency without requiring excessive manufacturing precision beyond standard industrial capabilities
Solution Approach 2:
The screw drive mechanism allows for adjustment of critical parameters such as lead pitch, screw diameter, and thread profile to optimize the conversion ratio between rotational and linear motion. By adjusting these parameters, the system can be tuned for different pumping requirements while maintaining compact dimensions and reasonable manufacturing tolerances, thereby achieving high productivity without demanding extreme manufacturing precision
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 provides a reliable, efficient, and compact means of fluid displacement, eliminating the need for intermediate gearing and reducing complexity, while simultaneously pumping both process fluid and cooling air through a single mechanism.
Implementation Method 1
a plurality of rolling elements disposed between the screw and the rotor. The screw is disposed coaxially with the rotor. The plurality of rolling elements support the screw relative the rotor and drive the screw axially
Data Source
AI summary
An electrically operated displacement pump includes an electric motor having a stator and a rotor. The rotor is connected to the fluid displacement member to drive axial reciprocation of the fluid displacement member. A drive mechanism is disposed between and connected to each of the rotor and the fluid displacement member. The drive mechanism receives a rotational output from the rotor and provides a linear input to the fluid displacement member. A controller controls operation of the motor based on an operating state of the motor to control pumping by the displacement pump.