Reducing Agent Pump Cooling Duct Layout in Working Machines
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Solution Overview
Problem
Existing reducing agent pumps in large working machines are not sufficiently cooled, leading to potential deterioration of the liquid reducing agent and reduced efficiency in exhaust gas cleaning.
Innovation Solution
A machine body design that incorporates a cooling fan and duct section to direct outside air to the reducing agent pump, utilizing existing access openings and tank side surfaces to form a duct, enhancing cooling efficiency without the need for separate air intake sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the reducing agent pump is disposed midway between the reducing agent tank and the exhaust gas cleaning apparatus to accommodate long distances in large-sized working machines, then the existing typical reducing agent pump can be used, but the reducing agent pump cannot be sufficiently cooled by simply taking in outside air using the access opening section
Solution Approach 1:
The patent merges the cooling air intake function with the existing access opening section for the air cleaner. The same opening section serves dual purposes: allowing access to the air cleaner for maintenance and serving as the air intake opening for cooling the reducing agent pump. This eliminates the need for a separate cooling air intake opening and integrates multiple functions into a single structural element.
Solution Approach 2:
The patent introduces a duct section as an intermediary component that guides cooling air from the opening section to the reducing agent pump. This duct acts as a mediator that efficiently directs the cooling airflow path, ensuring that the air intake opening can effectively cool the pump even when disposed at a distance from the reducing agent tank.
2Temperature
If a separate air intake opening is formed for cooling the reducing agent pump, then cooling efficiency is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the cooling air intake function with the existing access opening section for the air cleaner. By making the opening section serve dual purposes (access to air cleaner and air intake for pump cooling), the number of separate openings is reduced, simplifying the overall structure and reducing manufacturing complexity.
Solution Approach 2:
The opening section is designed to perform multiple functions: it serves as an access opening for the air cleaner maintenance and simultaneously as the air intake opening for cooling the reducing agent pump. This multi-functionality reduces the total number of components and simplifies the device structure.
3Temperature
If the opening section is formed as a separate structure for cooling, then cooling function is achieved, but the ease of manufacture decreases due to additional components
Solution Approach 1:
The patent integrates the cooling air intake function into the existing opening section structure rather than creating a separate component. This merging approach reduces the total number of parts that need to be manufactured and assembled, thereby improving ease of manufacture while still achieving the cooling function.
Solution Approach 2:
The opening section is designed as a universal structure that serves both as an access opening and a cooling air intake opening. This multi-functional design eliminates the need for separate manufacturing of dedicated cooling openings, simplifying the manufacturing process.
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 reducing agent pump is efficiently cooled, maintaining the quality of the liquid reducing agent and improving the exhaust gas cleaning process, while reducing the complexity and cost of duct section formation.
Implementation Method 1
an opening section that takes in an outside air which cools the reducing agent pump by driving a cooling fan; and a duct section that leads the outside air taken from the opening section to the cooling fan
Data Source
AI summary
A machine body comprises a sieving frame having a bottom plate. The machine body comprises an engine. The machine body comprises an exhaust gas cleaning apparatus that executes reduction treatment on a predetermined oxide in an exhaust gas of the engine by injecting a liquid reducing agent. The machine body comprises a reducing agent tank that stores a liquid reducing agent. The machine body comprises a reducing agent pump that feeds the liquid reducing agent stored in the reducing agent tank to the exhaust gas cleaning apparatus. The machine body comprises a cooling fan. The machine body is disposed on the bottom plate of the slewing frame and comprises an opening section that takes in outside air that cools the reducing agent pump by driving the cooling fan. The machine body comprises a duct section that leads the outside air taken from the opening section to the cooling fan.