Overview of the working process of the pneumatic valve of MI portable oxygen concentrator.
Overview of the working process of the pneumatic valve of MI portable oxygen concentrator.
1. Structure Introduction
2. Intake, high-pressure area
When the intake valve group is connected to high-pressure gas, the position of the red line is the high-pressure area, and the arrows indicate the direction.
3. Initial pressure state of control area
In the control chamber, the key component is the diaphragm:
The diaphragm adjusts the position of the valve stem as the air pressure at both ends changes, thus realizing the process of converting electrical signals into pneumatic signals. In the diagram, the red arrow indicates the direction of high-pressure gas, and the green arrow indicates the direction of air flow. Due to the reduction of green air flow, the pressure in the yellow area is lower than that in the red area. The valve stem moves to the side of the high-pressure chamber, and the diaphragm blocks the air inlet of the control chamber, allowing air to enter the molecular sieve.
When two solenoid valves are opened simultaneously, both molecular sieves are inflated at the same time.
4. Signal is given to control valve 1 alone
When the air pressure reaches a certain value, solenoid valve 2 is closed and solenoid valve 1 supplies gas alone.
When solenoid valve 2 is closed, the control chamber is connected to the atmosphere and the air pressure is released. The two molecular sieves are connected by the purging hole. The pressure from molecular sieve 1 will push the valve stem to move towards the control chamber, blocking the channel for high-pressure gas to enter molecular sieve 2, and molecular sieve 2 exhausts. In the figure, the red arrow is the direction of high-pressure gas, and the green arrow is the direction of air flow. Due to the reduction of green air flow, the pressure in the yellow area is less than that in the red area.
When solenoid valve 1 is open and solenoid valve 2 is closed, molecular sieve 1 is pressurized for oxygen production, and molecular sieve 2 is exhausted and regenerated.
5. Pressure equalization, preparing for switching
When molecular sieve 1 is close to saturation, two solenoid valves are opened. There is gas input in both gas paths and the pressure of molecular sieve 1 is quickly transferred to molecular sieve 2 until the pressures of the two molecular sieves are equal. This process is a stamping process. Molecular sieve 2 is quickly pressurized to ensure efficiency.
In the figure, the red arrow is the direction of high-pressure gas, and the green arrow is the direction of air flow. Due to the reduction of green air flow, the pressure in the yellow area is less than that in the red area. The valve stem moves to the side of the high-pressure chamber, and the diaphragm blocks the air inlet of the control chamber, allowing air to enter the molecular sieve. During the opening process, the two molecular sieves are connected by the valve group. The pressure of molecular sieve 1 is rapidly transferred to molecular sieve 2 until the pressures of the two molecular sieves are balanced.
When two solenoid valves are opened simultaneously, both molecular sieves are inflated at the same time.
6. Signal is given to control valve 2 alone
When the air pressure reaches a certain value, solenoid valve 1 is closed and solenoid valve 2 supplies gas alone.
When solenoid valve 1 is closed, the control chamber is connected to the atmosphere and the air pressure is released. The two molecular sieves are connected by the purging hole. The pressure from molecular sieve 2 will push the valve stem to move towards the control chamber, blocking the channel for high-pressure gas to enter molecular sieve 1, and molecular sieve 1 exhausts. In the figure, the red arrow is the direction of high-pressure gas, and the green arrow is the direction of air flow. Due to the reduction of green air flow, the pressure in the yellow area is less than that in the red area.
When solenoid valve 2 is open and solenoid valve 1 is closed, molecular sieve 2 is pressurized for oxygen production, and molecular sieve 1 is exhausted and regenerated.
7. Pressure equalization, preparing for switching
When molecular sieve 2 is close to saturation, two solenoid valves are opened. There is gas input in both gas paths and the pressure of molecular sieve 2 is quickly transferred to molecular sieve 1 until the pressures of the two molecular sieves are equal. This process is a stamping process. Molecular sieve 1 is quickly pressurized to ensure efficiency.
In the figure, the red one is high-pressure gas, and the green one is the direction of air flow. Due to the reduction of green air flow, the pressure in the yellow area is less than that in the red area. The valve stem moves to the side of the high-pressure chamber, and the diaphragm blocks the air inlet of the control chamber, allowing air to enter the molecular sieve. During the opening process, the two molecular sieves are connected by the valve group, and the pressure of molecular sieve 2 is rapidly transferred to molecular sieve 1 until the pressures of the two molecular sieves are balanced.
When two solenoid valves are opened simultaneously, both molecular sieves are inflated at the same time.
8. The two molecular sieves are regenerated in a cycle, and the oxygen generator works normally
Taking the above regeneration process as a unit and continuously repeating the oxygen production and regeneration cycle forms a benign closed-loop operation, which can provide oxygen continuously for a long time.
In the figure, the blue arrow indicates the direction of the exhaust air flow. After being discharged from the molecular sieve, it passes through the sound-absorbing cotton for noise reduction and is then discharged from the valve group.
