Engine Exhaust Purification Support Frame Design
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Solution Overview
Problem
Existing engine devices face challenges in maintaining optimal temperature for exhaust gas purification, leading to incomplete chemical reactions and compactness issues due to the placement and support of diesel particulate filters (DPF) and selective catalyst reduction (SCR) cases, affecting assembly, maintenance, and engine room design.
Innovation Solution
The engine device incorporates a support frame body to firmly fix the DPF and SCR cases, with a urea mixing pipe between them, and features a vent hole in the support base to form an air passage, allowing for improved ventilation and compact support, enabling easier assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the DPF case and the SCR case are assembled away from the engine, then the installation space is easier to secure, but the temperature of the exhaust gas supplied to the cases is lowered, causing incomplete chemical reactions
Solution Approach 1:
The patent introduces a heat insulation cover as an intermediary component between the exhaust manifold and the DPF/SCR cases. This cover prevents heat loss during exhaust gas transport, allowing the cases to be positioned away from the engine for easier installation while maintaining sufficient exhaust gas temperature for complete chemical reactions.
Solution Approach 2:
The exhaust gas purification system is segmented into separate functional modules (exhaust manifold, heat insulation cover, DPF case, SCR case) that can be independently positioned and assembled. This modular approach allows optimization of each component's location while maintaining system performance.
2Temperature
If the DPF case and the SCR case are assembled close to the engine, then the exhaust gas temperature is maintained high, but the engine room becomes hard to construct compactly and assembly/maintenance workability is reduced
Solution Approach 1:
The support structure incorporates adjustable support legs with adjustable legs that can be extended or retracted, and a movable support base that can be positioned at different locations. This dynamic adjustability allows the DPF and SCR cases to be optimally positioned for both high temperature maintenance and ease of assembly/maintenance access.
Solution Approach 2:
The system transitions from fixed two-dimensional positioning to three-dimensional adjustable positioning using vertical support legs and movable bases. This allows the exhaust gas purification cases to be positioned in optimal spatial locations that balance temperature requirements with accessibility for assembly and maintenance operations.
3Reliability
If the DPF case and the SCR case are attached to two parallel base frames, then the cases can be supported, but the support attitude is hard to set to predetermined attitude due to working error of the attachment part
Solution Approach 1:
The support system incorporates self-adjusting mechanisms where the adjustable legs and movable base automatically compensate for installation errors and achieve the predetermined support attitude without requiring high manufacturing precision. The system self-corrects positioning deviations through its adjustable components.
Solution Approach 2:
The support structure allows continuous adjustment of geometric parameters (leg lengths, base position) to compensate for manufacturing tolerances and achieve the precise predetermined attitude required for proper exhaust gas flow and thermal management.
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 enhances assembly and maintenance workability, reduces interference, and improves the compactness of the engine room by securing a cooling air passage, maintaining optimal temperature, and simplifying the exhaust gas piping structure.
Implementation Method 1
features a vent hole in the support base to form an air passage, allowing for improved ventilation
Data Source
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AI summary
An object of the present invention is to provide an engine device which can improve an assembly workability of an engine (1) and can improve a maintenance workability of the engine (1) while it is possible to well maintain a ventilation performance in an outer peripheral portion of the engine (1). The engine device of the present invention has a first case (28) which removes particulate matters in exhaust gas of the engine (1), and a second case (29) which removes nitrogen oxides in the exhaust gas of the engine (1). The second case (29) is connected to the first case (28) via a urea mixing pipe (39). The engine device is provided with a plurality of support leg bodies (82, 84, 86) which are connected their one end sides to the engine (1), and a support base (87) which is connected to a plurality of support leg bodies (82, 84, 86). The first case (28) and the second case (29) are arranged in the support base (87).