Exhaust Gas Purifying Device Double Structure Sensor Boss Bodies
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Solution Overview
Problem
In diesel engine exhaust gas purifying devices, the arrangement of temperature and pressure sensors between oxidation catalysts and soot filters leads to temperature imbalances, causing frequent regeneration of soot filters and handling difficulties, while also complicating assembly and maintenance, and increasing the risk of sensor piping damage.
Innovation Solution
The exhaust gas purifying device features a double structure with sensor boss bodies extending outward from the outside case, heat shields, and a three-layer structure to maintain temperature balance, reduce sensor piping exposure, and enhance assembly and maintenance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the exhaust gas temperature sensor and pressure sensor are arranged between the oxidation catalyst and soot filter in a single structure case, then the sensors can detect exhaust gas parameters, but the exhaust gas temperature in the inner portion of the case is lowered causing particulate matter to clog the soot filter frequently
Solution Approach 1:
The device is divided into separate inside case and outside case structures, with sensors arranged in the outside case rather than the inside case. This segmentation allows the exhaust gas flow path to maintain higher temperatures while sensors are positioned in a cooler external environment, preventing soot filter clogging while enabling temperature detection.
Solution Approach 2:
The patent introduces an intermediary structure (the separate outside case with sensor boss bodies) that mediates between the need for sensor detection and the need to maintain exhaust gas temperature. The sensors detect exhaust gas parameters through this intermediary structure without directly interfering with the thermal environment of the exhaust gas flow.
2Measurement precision
If the exhaust gas temperature sensor and pressure sensor are arranged between the oxidation catalyst and soot filter, then sensor detection is enabled, but the outer surface of the case comes to high temperature requiring maintenance after cooling
Solution Approach 1:
The sensor boss bodies and sensor mounting structures are extracted from the inside case and placed in the outside case. This extraction removes the sensors from the high-temperature zone, allowing maintenance personnel to access and service the sensors without waiting for the exhaust system to cool down, thereby improving ease of operation.
3Measurement precision
If the exhaust gas pressure sensor is provided in the engine or machine body side, then the sensor can detect exhaust gas pressure, but it is necessary to evaluate the initial setting condition per plural specifications of engines increasing evaluating manpower
Solution Approach 1:
The outside case with sensor boss bodies serves as a universal mounting structure that can be applied across multiple engine specifications. The standardized sensor arrangement in the outside case eliminates the need for separate evaluation processes for different engine types, reducing device complexity and evaluation manpower requirements.
4Measurement precision
If sensor piping is extended from the DPF to the engine or machine body side, then the pressure sensor can be connected, but the sensor piping is exposed to contact during assembly and maintenance reducing handling workability
Solution Approach 1:
The sensor boss bodies are merged with the outside case structure, integrating the sensor mounting function directly into the case. This eliminates the need for separate sensor piping extensions that are vulnerable to damage during assembly and maintenance, thereby improving handling workability while maintaining pressure sensing capability.
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 improves the purifying performance of the exhaust gas, reduces the frequency of soot filter regeneration, allows for easier maintenance, and enhances the handling and assembly of the device by maintaining temperature balance and protecting sensor components.
Implementation Method 1
heat shields, and a three-layer structure to maintain temperature balance
Data Source
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AI summary
An object of the invention is to provide an exhaust gas purifying device which can improve a handling workability such as maintenance of an engine (70) while it can improve a purifying performance of an exhaust gas of the engine (70). The exhaust gas purifying device of the invention is provided with a plurality of gas purifying bodies (2, 3) which purifies the exhaust gas discharged by the engine (70), a plurality of inside cases (4, 20) which is inward provided with the gas purifying bodies (2, 3), and outside case (5, 21) which are inward provided with the inside cases (4, 20). An outlet end portion of the inside case (4) in an exhaust gas upstream side and an inlet end portion of the inside case (20) in an exhaust gas downstream side are superposed as a double structure. Sensor boss bodies (110, 113) for supporting exhaust gas sensors (63, 109) are arranged in an outside surface of the outlet end portion or the inlet end portion of the double structure. The sensor boss bodies (110, 113) are extended to an outside direction of the outside case (5).