Dosing Valve Calibration Body Connection for Freezing Resistance
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Solution Overview
Problem
Existing metering valves for urea-water solutions in exhaust gas treatment systems are prone to freezing, which can cause structural damage and operational failures due to the expansion of frozen additives, and require expensive designs to withstand freezing temperatures.
Innovation Solution
A metering valve design featuring a valve housing with a movable valve body, a spring for maintaining a rest position, and a calibration body secured via both a press connection and a material connection, such as a welded or soldered joint, to ensure consistent spring force and prevent deformation under ice pressure, combined with a drive unit for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the metering valve uses a press connection to secure the calibration body, then the assembly is simple and cost-effective, but the connection deforms under ice pressure when the additive freezes
Solution Approach 1:
The calibration body is inserted into the valve housing with a press connection before the additive can freeze. This preliminary assembly allows the components to be easily manufactured and assembled, while the subsequent material connection prevents deformation when freezing occurs during operation.
Solution Approach 2:
The connection between the calibration body and valve housing combines two different connection methods: a press connection (mechanical fit) and a material connection (welding or soldering). This composite connection approach provides both ease of assembly and resistance to deformation under ice pressure.
2Reliability
If the metering valve is designed to withstand freezing temperatures, then it resists damage from frozen additives, but the cost of the valve increases
Solution Approach 1:
The metering valve is divided into separate components (valve housing, calibration body, valve body) that can be manufactured using standard, cost-effective processes. The freezing resistance is achieved through the connection method between components rather than requiring the entire valve to be made from expensive freeze-resistant materials.
Solution Approach 2:
The combination of press connection and material connection creates a composite structural system that provides freezing resistance. This allows the use of conventional, cost-effective materials and manufacturing processes while achieving the required durability against freezing damage.
3Manufacturing precision
If the calibration body is securely connected to prevent deformation, then consistent spring force is maintained, but the connection method becomes more complex
Solution Approach 1:
The calibration body is preliminarily positioned using a press connection that allows for precise adjustment of the spring force. Once the correct position is achieved, a material connection is created to lock it in place. This preliminary positioning step enables manufacturing precision without requiring complex connection mechanisms from the start.
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 design effectively prevents permanent deformation and ensures consistent performance by distributing forces between connections, maintaining the metering valve's functionality and cost-effectiveness even under freezing conditions.
Implementation Method 1
a spring which exerts a spring force on the valve body and thus holds the valve body in a rest position
Implementation Method 2
a calibration body secured via both a press connection and a material connection, such as a welded or soldered joint
Implementation Method 3
a calibration body secured via both a press connection and a material connection, such as a welded or soldered joint
Implementation Method 4
the additive freezes, which can cause structural damage and operational failures due to the expansion of frozen additives
Implementation Method 5
the expansion of frozen additives
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a dosing valve (1), at least having a valve housing (6) with a duct (7) and having a valve body (2) which is movable in order to open and close the dosing valve (1) and having a spring (3) which exerts a spring force on the valve body (2) and thus holds the valve body (2) in a rest position, wherein the spring (3) is supported on at least one calibration body (4), the valve body (2), the spring (3) and the at least one calibration body (4) are arranged in the duct (7), and the at least one calibration body (4) is fastened in the valve housing (6) at least by means of a cohesive connection (5).