Multi-Protection Valve Third Check Valve Air Leakage
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Solution Overview
Problem
When the pneumatic device connected to the upstream side of the multi-protection valve fails, causing air leakage, the air in the parking brake circuit can leak through the connection passage, leading to engagement of the parking brake and rendering the vehicle inoperable.
Innovation Solution
Incorporating a third check valve between the input chamber and the input port to prevent reverse airflow, ensuring that air from the parking brake circuit does not leak back through the bleed air flow path, thereby maintaining the integrity of the air supply and allowing the vehicle to run even if the compressed air source fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bleed air flow path is provided to allow air discharge from the parking brake circuit, then the parking brake can be disengaged when air leakage occurs in main brake circuits, but air may leak from the failure location through the bleed air flow path when the compressed air source fails, causing the parking brake to engage and rendering the vehicle inoperable
Solution Approach 1:
A third check valve is introduced as an intermediary component between the input chamber and the input port. This check valve acts as a mediator that allows air to flow from the input port to the input chamber during normal operation, but prevents reverse flow from the input chamber to the input port when the compressed air source fails, thereby blocking the harmful air leakage path through the bleed air flow path.
Solution Approach 2:
The harmful reverse airflow path is extracted and blocked by the third check valve. The check valve specifically removes the capability of air to flow backward from the input chamber through the input port to the external failure location, while preserving the forward flow path for normal operation and the bleed air flow path for emergency discharge.
2Ease of operation
If check valves and throttles are disposed in series in the connection passage, then air flow direction can be controlled and flow rate regulated, but the structure becomes more complex
Solution Approach 1:
The air flow control function is segmented into multiple independent check valves positioned at different locations in the circuit. The first check valve is in the connection passage, the second check valve is in the bleed air flow path, and the third check valve is between the input chamber and input port. Each check valve handles a specific flow control task, making the overall system more modular and easier to manufacture and maintain compared to a single complex multi-functional valve.
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 third check valve effectively prevents air leakage from the failure location, ensuring the vehicle remains operational by preventing reverse airflow, thus enhancing the safety, usability, and stability of the multi-protection valve.
Implementation Method 1
a third check valve provided between the input chamber and the input port to prevent air from flowing from the input chamber into the input port
Implementation Method 2
the bleed air flow path having a second check valve for preventing air from flowing from the input chamber into the parking output port
Implementation Method 3
the communication passage having therein a check valve for preventing air from flowing from the service output port into the input chamber
Data Source
AI summary
An object of the present invention is to allow a vehicle to run in the case where an air compressor connected to an input port fails so as to cause air leakage from the location of the failure, by preventing air in a parking brake circuit from leaking from the failure location through a bleed air flow path. In order to achieve the object, a multi-protection valve includes: a communication passage for communicating between an input chamber and a service output port so as to bypass a pressure control valve provided in correspondence with the service output port, the communication passage having a check valve for preventing air from flowing from the service output port into the input chamber and a throttle for restricting the air flow rate; and a bleed air flow path for communicating between the input chamber and the parking output port so as to bypass pressure control valves, the bleed air flow path having a second check valve for preventing air from flowing from the input chamber to the parking output port. The multi-protection valve further includes a third check valve provided between the input chamber and an input port to prevent air from flowing from the input chamber to the input port.