Reducing Agent Tank Arrangement for Heat Dissipation
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Solution Overview
Problem
The arrangement of a reducing agent tank with a control valve in construction machines leads to performance degradation due to heat transfer, as the reducing agent degrades under high-temperature conditions, and existing ventilation solutions increase the number of parts and complexity.
Innovation Solution
The reducing agent tank is positioned above a partition plate separating it from the control valve, with an air flow passage and gap for external air to flow through, facilitating heat dissipation and reducing temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the reducing agent tank is arranged in the instrument accommodating chamber together with the control valve, then the space utilization is improved, but the reducing agent temperature increases due to heat generation from the control valve
Solution Approach 1:
The instrument accommodating chamber is divided into a lower valve accommodating chamber for the control valve and an upper tank accommodating chamber for the reducing agent tank, separated by a partition plate. This segmentation physically isolates the heat-generating control valve from the temperature-sensitive reducing agent tank, preventing heat transfer while maintaining compact space utilization.
Solution Approach 2:
A partition plate is introduced as an intermediary structure between the control valve and reducing agent tank. The partition plate acts as a thermal barrier that blocks heat conduction from the control valve to the reducing agent tank, while still allowing the overall compact arrangement to be maintained.
2Temperature
If a fan is added to the instrument chamber to force ventilation, then the reducing agent temperature is reduced, but the number of parts and device complexity increases
Solution Approach 1:
The fan component is completely removed from the system. Instead of using forced ventilation with a fan, the invention relies on natural air circulation through the gap between the cover bodies and the air flow passage between the partition plate and tank, eliminating the need for active cooling components.
Solution Approach 2:
The system uses self-service cooling where ambient air naturally flows through the air flow passage and gap openings to cool the reducing agent tank. The air flow is driven by natural convection and pressure differences created during machine operation, without requiring external power or mechanical assistance.
3Area of stationary object
If the intake opening is covered by the fuel tank, then the structural integration is improved, but the air flow passage is blocked and heat dissipation is reduced
Solution Approach 1:
The cooling system uses asymmetric air flow paths with multiple openings positioned at different locations (gap between cover bodies, air flow passage between partition plate and tank). This asymmetric arrangement ensures that air can enter and circulate effectively without being blocked by the fuel tank's position, maintaining both structural integration and heat dissipation efficiency.
Solution Approach 2:
The air flow passage is created in the vertical dimension between the partition plate and the reducing agent tank, rather than relying solely on horizontal openings that could be blocked by the fuel tank. This three-dimensional air flow path ensures effective heat dissipation while maintaining compact structural integration.
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 configuration effectively blocks heat transfer from the control valve to the reducing agent tank, stabilizes the tank's temperature, and reduces the number of parts required, enhancing the reliability and efficiency of the system.
Implementation Method 1
a gap as an inflow-outflow opening for external air to pass through the air flow passage is provided vertically between a cover body covering the tank accommodating chamber and a cover body covering the valve accommodating chamber
Implementation Method 2
External air taken in from the intake opening passes through below the fuel tank and heads to the exhaust opening
Implementation Method 3
a tank accommodating chamber accommodating the reducing agent tank is provided above a valve accommodating chamber accommodating the control valve, the reducing agent tank is arranged above a partition plate that separates the tank accommodating chamber and the valve accommodating chamber
Data Source
AI summary
To control elevation of the temperature of the reducing agent in a reducing agent tank which is located near a heat generating control valve in a construction machine, a tank storage room 8 housing a urea aqueous tank is located at the upper side of a valve housing room where control valves are housed. The urea aqueous tank is mounted at the upper side of a bulkhead plate which separates a tank storage room and the valve housing room one above the other having an empty space between so that air can flows through an air flow path S, and a space A is provided between a cover body covering the tank storage room and a cover body covering the valve housing room so that the air flows in and out through the space A and the air flow path S.