Pump Cooling Line Calibrated Conduit Pressure Drop
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Solution Overview
Problem
Existing ELOP pumps experience suction pressure drops due to fluid diversion for cooling, which affects fluid distribution and cooling efficiency.
Innovation Solution
The design incorporates a permanently open cooling line with a calibrated conduit system that draws off working fluid from a high-pressure area, ensuring uniform heat exchange and preventing pressure drops by eliminating check valves, allowing for efficient fluid distribution and cooling of the electric motor and electronic unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If working fluid is tapped off for cooling the electric motor and electronic unit, then cooling effect is improved, but suction pressure drop increases
Solution Approach 1:
The pump system is segmented into multiple independent fluid pathways: a main pumping section for delivering working fluid to the transmission, and a separate cooling line with its own calibrated conduit system for cooling the motor and electronic unit. This segmentation allows each pathway to be optimized independently, preventing pressure drops in the main line while ensuring adequate cooling flow.
Solution Approach 2:
The cooling line incorporates a calibrated conduit system with specifically designed geometry and dimensions tailored for cooling applications. The conduit has optimized cross-sectional areas and lengths to ensure uniform fluid distribution to the electronic unit and motor, providing localized quality enhancement for heat exchange while maintaining overall system pressure stability.
2Temperature
If fluid is diverted to cooling conduits, then cooling performance is improved, but fluid distribution to transmission is reduced
Solution Approach 1:
The cooling line is designed with preliminary calibrated conduit dimensions and geometry that pre-determine optimal fluid distribution patterns. The conduit system is configured in advance to provide uniform fluid flow to the electronic unit and motor, ensuring that cooling performance is maximized without compromising the quantity of fluid available for the main transmission system.
Solution Approach 2:
The calibrated conduit system acts as an intermediary element between the fluid source and the cooling targets (electronic unit and motor). This intermediary component regulates and optimizes fluid distribution through its specifically designed geometry, ensuring adequate cooling flow while maintaining proper fluid quantities for the main transmission system.
3Ease of operation
If check valves are used to control cooling flow, then flow direction is controlled, but pressure drops and complexity increase
Solution Approach 1:
The design extracts and eliminates the check valve component from the cooling line system. Instead of using a check valve to control cooling flow direction, the system relies on the inherent pressure differential between the high-pressure area (where fluid is tapped) and the cooling targets, combined with the calibrated conduit geometry, to ensure unidirectional flow without mechanical valves.
Solution Approach 2:
The cooling line system is designed to be self-regulating through its calibrated conduit dimensions and pressure differential. The system automatically controls fluid flow to the electronic unit and motor based on inherent pressure differences, without requiring external control mechanisms like check valves, thereby reducing complexity and pressure losses.
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
This solution prevents suction pressure drops while optimizing fluid distribution and cooling, ensuring sufficient oil flow for effective lubrication and cooling across various operating conditions.
Implementation Method 1
The calibrated conduit (61) draws off a working fluid from a high-pressure area
Implementation Method 2
ensuring uniform heat exchange and preventing pressure drops
Implementation Method 3
uniform heat exchange
Data Source
AI summary
A pump (1) for pumping a working fluid includes an electric motor (3) for actuating the pump and a motor (3) having a stator (31) and a rotor (32) that interact for the actuation of the pump. The rotor (32) is rotatable about an axis of rotation (320). The pump includes an electronic unit (4) for controlling the electric motor (3), a conduit (5) for the delivery of the working fluid downstream of the pump, a line (6) for cooling the electric motor (3), and the electronic unit (4). The cooling line (6) is permanently open and drawing off some of the working fluid processed by the pump. The cooling line (6) includes a first conduit (61) which is developed from a delivery area (22) of the pump.