Fuel Pump Mounting on Tank Wall for Heat Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hand-held work apparatuses with integrated fuel and delivery pumps face issues with excessive heating of the fuel pump, leading to vapor bubble formation and reduced fuel delivery, especially when the engine is hot and cooling air is not available.
Innovation Solution
The fuel pump and delivery pump are arranged at least partially on the tank wall of the fuel tank, which is kept in a cool region, allowing heat dissipation through the tank and surrounding air, and are positioned in a depression to minimize hydrostatic pressure differences, reducing the power required to operate the pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fuel pump is arranged close to the combustion engine for compact design, then the device complexity is reduced, but the fuel pump overheats due to proximity to heat sources
Solution Approach 1:
The fuel pump assembly is segmented from the combustion engine by being mounted on the fuel tank rather than directly on the engine. This spatial segmentation separates the heat-sensitive fuel pump from the heat-generating engine while maintaining system compactness through integrated tank mounting.
Solution Approach 2:
The fuel tank serves as an intermediary mounting surface between the combustion engine and the fuel pump. By placing the fuel pump on the tank wall adjacent to cool regions, the tank acts as a thermal buffer and positioning intermediary that protects the fuel pump from direct engine heat while maintaining operational proximity.
2Temperature
If the fuel pump is cooled by surrounding air, then heat dissipation is improved, but the fuel pump requires separate cooling pathways increasing device complexity
Solution Approach 1:
The fuel pump utilizes the surrounding air environment for passive cooling without requiring active cooling systems. The mounting position on the fuel tank wall exposes the fuel pump to ambient air flow, allowing self-cooling through natural convection and radiation without additional cooling components.
Solution Approach 2:
The cooling mechanism changes from active forced cooling to passive natural cooling by altering the thermal parameters. The fuel pump relies on natural heat dissipation to surrounding air and thermal conduction through the fuel tank wall, changing the cooling mode from high-energy active cooling to low-energy passive cooling.
3Ease of operation
If the delivery pump is positioned far from the fuel tank to improve accessibility, then ease of operation is improved, but the hydrostatic pressure difference increases requiring more power
Solution Approach 1:
The delivery pump is positioned in a depression of the fuel tank to create equipotential conditions with the fuel level. By placing the pump at or near the same gravitational potential as the fuel source, the hydrostatic pressure difference is minimized, reducing the energy required for fuel delivery while maintaining ergonomic accessibility.
Solution Approach 2:
The fuel tank is designed with a local depression specifically at the mounting location for the delivery pump. This localized geometric modification creates a low-point area that minimizes height difference and hydrostatic pressure requirements, while the overall tank position remains accessible to the operator.
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 arrangement effectively prevents excessive heating of the fuel pump, ensures continuous fuel delivery, and reduces the operator's effort in actuating the delivery pump by maintaining a low hydrostatic pressure difference and providing a secure, ergonomic design.
Implementation Method 1
Heat which is input into the fuel pump can be dissipated via the tank wall of the fuel tank into the fuel and front there via cool regions of the fuel tank to the outside
Implementation Method 2
the heat is dissipated to the surrounding air by the fuel pump
Implementation Method 3
The fuel itself brings about a uniform temperature distribution in the fuel tank and, as a result, satisfactory dissipation of heat
Data Source
AI summary
A work apparatus has an internal combustion engine for driving a work tool of the work apparatus and a fuel pump which is driven by the engine and delivers fuel from a fuel tank to the engine. The work apparatus has a feed pump which is to be actuated manually by the operator. The fuel pump and the feed pump form one assembly which is arranged outside the fuel tank. The fuel tank has a tank wall which delimits the tank interior. An advantageous arrangement and satisfactory cooling of the assembly are achieved if the assembly is arranged at least partially on the tank wall.