Pneumatic Pump Overpressure Valve Noise and Air Reuse
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Solution Overview
Problem
Current pneumatic pumps used in vehicle seats generate noise during pressure relief due to direct communication of the spring chamber with the atmosphere, and they do not effectively reuse air during the pressure relief process, leading to inefficiencies.
Innovation Solution
A pneumatic pump design featuring an overpressure protection valve with a gasket and spring, where the intake chamber communicates with the spring chamber of a cap, allowing air to be reused and reducing noise by separating the discharge and backflow channels with a gasket, and utilizing a driving device to adjust the pump chamber volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring chamber is directly communicating with the atmosphere, then the overpressure valve can relieve pressure effectively, but noises are generated during pressure relief
Solution Approach 1:
The patent introduces an intake chamber as an intermediary between the spring chamber and the atmosphere. The intake chamber connects to the pump chamber through an air-flow channel, allowing the spring chamber to communicate with the pump chamber rather than directly with the atmosphere. This intermediary chamber enables pressure relief while reducing noise by controlling the airflow path.
2Reliability
If air is discharged directly to the atmosphere during pressure relief, then overpressure protection is achieved, but work efficiency decreases due to loss of compressed air
Solution Approach 1:
The patent implements a system where air discharged during pressure relief is not lost to the atmosphere but is instead redirected back to the pump chamber through the backflow channel. The gasket separates the air-flow channel and backflow channel, enabling the recovered air to be reused in the next pumping cycle, thereby improving work efficiency while maintaining overpressure protection.
3Device complexity
If the air-flow channel and backflow channel are not separated, then the structure is simpler, but air cannot be effectively reused and noise is generated
Solution Approach 1:
The patent divides the internal channel structure into separate air-flow channel and backflow channel, controlled by different portions of the gasket. The central part of the gasket closes the air-flow channel while the outer ring manages the backflow channel. This segmentation enables independent control of air paths, allowing effective air reuse and noise reduction despite increased structural complexity.
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 reduces noise during pressure relief and increases work efficiency by reusing air, preventing bladder explosions and improving the overall performance of the pneumatic pump.
Implementation Method 1
the spring mounted in the spring chamber of the cap and abutting against the gasket for pushing the gasket to move toward the valve base and the valve; wherein the gasket of the overpressure protection valve compresses the spring to open the air-flow channel when the pressure in the pump chamber is over a preset limit
Implementation Method 2
a diaphragm member disposed on the diaphragm carrier and having a plurality of interlocking parts; a pump chamber is formed between the diaphragm member and the valve base; wherein the driving device drives the diaphragm member to act for discharging air from the pump chamber
Data Source
AI summary
A pneumatic pump having an overpressure protection valve having a gasket and spring that includes a diaphragm carrier, a diaphragm member, a valve base, a valve, a cap, a driving device and an overpressure protection valve is revealed. A pump chamber is formed between the diaphragm member and the valve base. The overpressure protection valve having a spring and a gasket. A discharge channel, an air-flow channel and a backflow channel are formed among the pump chamber, the valve base, the valve and the cap. The discharge channel, the overpressure protection valve and the spring chamber are separated. The gasket is disposed between the air-flow channel and the backflow channel for closing the air-flow channel normally. The driving device drives the diaphragm member for discharging air from the pump chamber through the discharge channel.