Urea Fluid Line Volume Reduction Element for Pump Suction
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Solution Overview
Problem
The existing fluid lines used to transport urea solution in diesel engines face challenges with freezing urea at low temperatures, which can damage the injection assembly, and the suction power of conventional pumps is insufficient to effectively remove the urea solution without causing damage.
Innovation Solution
A fluid line design incorporating a heating rod and a volume reduction element in the outlet-side end section, with a pump having a switchable conveying direction and connected to both the pump and injection arrangement, reduces the volume inside the tube, lowering the suction demands and facilitating faster emptying of the injection system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional pump is used to siphon back urea solution from the fluid line, then the pump structure remains simple, but the suction capacity is insufficient to effectively remove the urea solution
Solution Approach 1:
The invention extracts the harmful substance (urea solution) from the system by using the pump to siphon it back into the storage tank. The volume reduction element facilitates this extraction by concentrating the fluid into a smaller area, making it easier for the pump to remove the urea solution despite limited suction power.
Solution Approach 2:
The invention changes the physical parameters of the fluid line by introducing a volume reduction element that alters the cross-sectional area. This parameter change reduces the volume of urea solution that needs to be pumped back, thereby reducing the required suction power while maintaining effective removal capability.
2Quantity of substance
If the fluid line volume is reduced by adding volume reduction elements, then the amount of liquid to be pumped back is reduced, but the device complexity increases
Solution Approach 1:
The volume reduction element is nested within the existing fluid line structure. The element is inserted into the pipe and positioned using the existing heating element as a guide, allowing the volume reduction functionality to be integrated without requiring complete redesign of the fluid line system.
Solution Approach 2:
The heating element serves a dual purpose: it continues to heat the urea solution to prevent freezing, and it simultaneously serves as a positioning guide for the volume reduction element during assembly. This self-service approach reduces the need for additional complex positioning mechanisms.
3Reliability
If the pump runs continuously to ensure complete emptying of the injection system, then the emptying completeness is improved, but the energy consumption increases
Solution Approach 1:
The invention applies partial action by using the volume reduction element to concentrate the urea solution into a smaller volume. This allows the pump to effectively remove the urea solution with shorter operation time and lower energy consumption, while still achieving complete emptying of the injection system.
Solution Approach 2:
The heating element performs preliminary action by maintaining the urea solution at a temperature above freezing point throughout the fluid line. This preliminary heating action prevents urea crystallization that would otherwise impede pump operation and require additional energy to resolve.
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 reduced volume inside the tube decreases the amount of liquid that needs to be suctioned, allowing the pump to generate sufficient suction pressure to clear the injection arrangement without damaging it, ensuring faster emptying and reduced resistance, thus preventing urea-induced damage.
Implementation Method 1
a heating device that heats at least part of the pipe and at least part of the connector
Implementation Method 2
The suction capacity of such a pump is typically significantly lower
Data Source
Figure 1~2
AI summary
A fluid line (1) is described, comprising a pipe (2) with an inlet end section (3) with a first connector (5) and an outlet end section (4) with a second connector (10), wherein a cavity (17) is formed in the pipe (2) and is radially bounded internally by at least one auxiliary element (16). The aim is to minimize the suction requirements of a pump used to convey a liquid through the pipe. For this purpose, a volume reduction element (18) is provided in the cavity (17), at least in the region of the outlet end section (4).