Hose-Rigid Pipe Joint Structure for High-Pressure CO2 Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hose and rigid pipe connecting systems fail to ensure adequate sealing performance and axial tensile strength under high pressure and temperature fluctuations, particularly in new energy electric vehicles using carbon dioxide refrigerant, which limits their application in high-pressure air conditioning systems.
Innovation Solution
A hose and rigid pipe connecting system is developed, featuring a corrugated pipe wound with metal wires, integrated with a core pipe and sheaths, and a transition joint with a retaining ring, which enhances axial tensile strength and sealing reliability through welding and rubber coating, ensuring stability across high and low temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional automobile air conditioning hose assembly is used, then the structure is simple and easy to manufacture, but it cannot withstand the system pressure of 170 bar (limit pressure of 300 bar) and extreme temperatures of -40°C to 165°C
Solution Approach 1:
The hose employs a composite structure consisting of a rubber pipe, a metal wire reinforcement layer wound around the rubber pipe, and a corrugated pipe. This composite design combines the flexibility and sealing properties of rubber with the high strength and pressure resistance of metal wires, enabling the hose to withstand system pressures up to 170 bar (with a limit pressure of 300 bar) and extreme temperatures from -40°C to 165°C, while maintaining the necessary flexibility for automotive applications.
2Reliability
If rigid pipes are used for all connections, then the sealing performance is improved, but the inner space of the automobile is limited and it is impossible to adopt rigid pipes completely
Solution Approach 1:
The connecting system uses different materials for different parts of the hose assembly to optimize local properties. The rubber pipe provides flexibility and sealing, the metal wire reinforcement layer provides strength and pressure resistance, and the corrugated pipe provides additional flexibility and space adaptability. This local differentiation allows the hose to achieve reliable sealing performance while adapting to the limited inner space of automobiles, combining the advantages of both rigid and flexible connections.
3Strength
If the metal wires at both ends of the corrugated pipe are not sleeved with sheaths, then the manufacturing process is simpler, but the axial tensile strength and sealing reliability are insufficient under high pressure
Solution Approach 1:
The metal wires at both ends of the corrugated pipe are sleeved with sheaths before the final assembly. This preliminary action of adding sheaths reinforces the axial tensile strength of the hose ends, which are the most critical points for withstanding high pressure and preventing leakage. The sheaths are installed in advance during manufacturing, ensuring that the reinforcement is properly positioned and integrated into the overall hose structure, thereby improving sealing reliability under high pressure conditions.
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 system significantly improves pressure resistance and sealing performance, capable of withstanding extreme temperatures and pressures, with bursting pressures exceeding 800 bar and tensile strength of 10,880 N, effectively addressing the limitations of prior art and enabling the use in new energy vehicle air conditioning pipelines.
Implementation Method 1
by directly winding and weaving the metal wires around the corrugated pipe and then welding with the core pipe, the axial tensile strength and sealing reliability is improved
Implementation Method 2
by directly winding and weaving the metal wires around the corrugated pipe and then welding with the core pipe
Implementation Method 3
enhances axial tensile strength and sealing reliability through welding and rubber coating
Implementation Method 4
a transition joint with a retaining ring, which enhances axial tensile strength and sealing reliability
Data Source
AI summary
A hose and rigid pipe connecting system used in a high pressure system comprises: a hose made up of connecting a core pipe and a corrugated pipe, the outer side of the corrugated pipe being wound and woven by metal wires; a rigid pipe; a transition joint connecting the hose and the rigid pipe; and a retaining ring buckled on the outer side of the hose and the transition joint. The invention has the advantages that the sealing performance between the hose and the rigid pipe can be greatly improved, and the problem that the connecting part of the hose and the rigid pipe can not bear pressure Or resist high and low temperatures is solved; besides, the axial tensile strength and sealing reliability are improved by winding and weaving metal wires on the outer side of the metal corrugated pipe and then welding with the core pipe.