1. System composition
The small high purity gas booster pump works in a two-stage booster system which is composed of a control part and a working part. The working part can be divided into low-pressure working area, A-level high-pressure working area and two high-pressure working areas. Each working area is composed of cylinder body, cylinder cavity, piston and seal. The sealing device is used to realize the air tightness and self lubrication function of each station. The control part is a part of the automatic reversing mechanism of the compressed gas of the heating and cooling system, and the one-way air valve controls the exhaust of the high-pressure cylinder. It mainly realizes the cooling, reciprocating reversing, pressure control and overpressure protection equipment, and realizes the safe, reliable and continuous pressurization of the equipment.
2. Process flow
(1) First stage pressurization: after the supercharging device starts to work, the compressed gas is driven to enter the air chamber of the low-pressure cylinder through the air control valve, and the low-pressure cylinder of the left air chamber of the exhaust port is opened (at this time, the air chamber and the atmosphere). The driving compressed gas and air act on both sides of the low-pressure piston respectively, and the pressure difference between the two pistons produces the pressure difference. Because the pressure of driving compressed gas is greater than that of air, it pushes the low-pressure piston to move left in the low-pressure cylinder, and drives the transmission shaft to move. When the high-pressure piston connected to the drive shaft moves to the left, the volume of the high-level pressure chamber decreases, and the pressure of the high-purity gas in the cavity gradually increases. When the pressure is higher than the set value, the exhaust valve opens, and the compressed high-purity gas enters the secondary high-pressure cylinder. When the low-pressure piston moves to the left end, the pressure is increased. The commutator works and starts two-stage pressurization.
(2) Secondary pressurization: under the control of the driving compressed gas, the reversing mechanism automatically reverses, leaving the low-pressure cylinder cavity filled with the driving gas. When opening the combustion chamber outlet of the low-pressure cylinder, the appropriate work pushes the compressed air in the air cavity to escape from the air inlet of the heating part of the line and the corresponding cooling wing for heating and cooling. Under the action of driving compressed gas, the piston of low pressure cylinder drives the transmission shaft to the right and starts two-stage pressurization. At the same time, open the air inlet of the booster cylinder, and inhale the high-purity pressurized gas. When the piston of low-pressure cylinder runs to the far right, the two-stage pressurization is completed and a working cycle is completed.
(3) Continuous function: the combined compressed gas automatic reversing control mechanism and one-way air valve control the drive shaft of the low-pressure piston pressurization device for the exhaust of the high-pressure cylinder, so as to realize automatic reversing and continuous reciprocating motion, so as to realize the continuous rated output of high-pressure and high-purity gas to meet the needs of users.
(4) Pressure control and overpressure protection: the equipment has the functions of output gas pressure control and system overpressure protection. When the pressure of the high-pressure air storage tank or other gas equipment reaches the set value, the one-way air valve controlling the exhaust of the secondary high-pressure cylinder will cut off the pipeline and stop the air supply. When the equipment is shut down, the one-way air valve can also cut off the pipeline to prevent the high-pressure air tank and other gases from being supplied to the equipment. When the pressure of the equipment system exceeds the specified value due to special circumstances, the overpressure protection device will close the air control valve and stop driving the input compressed gas to prevent further pressurization failure and accident.
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