Vacuum pump mechanical selection
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(1) The vibration generated during the operation of the vacuum pump has no effect on the process and the environment. If the process does not allow it, choose a non-vibrating pump or take anti-vibration measures.
(2) Understand the components of the gas being pumped. The gas contains no condensable vapor, no particles, and no corrosion. When selecting a vacuum pump, you need to know the gas composition and select the appropriate pump for the pumped gas. If the gas contains vapors, particles, and corrosive gases, additional equipment such as condensers, dust collectors, etc., should be installed on the inlet line of the pump.
(3) The vacuum pump, at its working pressure, should be able to drain all the gas produced during the vacuum equipment process.
(4) The correct combination of vacuum pumps. Due to the selective pumping of the vacuum pump, a pump may sometimes be selected that does not meet the pumping requirements. Several types of pumps are required to be combined to supplement each other to meet the pumping requirements. For example, a titanium sublimation pump has a high pumping speed for hydrogen, but it cannot whirl, and a three-pole sputtering ion pump (or a bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon. Combined, it will make the vacuum device a better degree of vacuum. In addition, some vacuum pumps cannot work under atmospheric pressure and require pre-vacuum; some vacuum pumps have lower outlet pressures than atmospheric pressure and require a foreline pump, so they all need to be combined.
(5) Requirements of vacuum equipment for oil pollution. If the equipment strictly requires no oil, various oil-free pumps should be selected, such as water ring pumps, molecular sieve adsorption pumps, sputter ion pumps, and cryogenic pumps. If the requirements are not strict, you can choose an oil pump, plus some anti-oil pollution measures, such as adding cold traps, baffles, oil traps, etc., can also achieve clean vacuum requirements.
(6) Correctly select the working point of the vacuum pump. Each pump has a certain range of working pressure, such as: 2BV series water ring vacuum pump working pressure range 760mmHg~25mmHg (absolute pressure), in this wide pressure range, the pump's pumping speed changes with pressure (detailed changes in the situation with reference to the pump The performance curve), its stable working pressure range is 760 ~ 60mmHg. Therefore, the operating point of the pump should be selected within this range, and it should not be allowed to work long-term at 25~30mmHg.
(7) How the oil vapor discharged from the vacuum pump affects the environment. If the environment does not allow contamination, an oil-free vacuum pump can be selected, or the oil vapor can be discharged outdoors.
(8) The working pressure of the vacuum pump should meet the ultimate vacuum and working pressure requirements of the vacuum equipment. Such as: a vacuum drying process requires a working vacuum of 10mmHg, the ultimate vacuum of the selected vacuum pump at least 2mmHg, preferably up to 1mmHg. The ultimate vacuum of the pump is usually chosen to be one half to one order of magnitude higher than the working vacuum of the vacuum equipment.
(9) Vacuum pump price, operation and maintenance costs.
Mechanical Installation (1) The vacuum pump should be installed in a strong and stable place on the ground. There should be sufficient space around it to facilitate inspection, maintenance and maintenance.
(2) Vacuum pump foundation should be maintained under the base level, the base of the four corners is recommended to cushion rubber or cast with a bolt to ensure the smooth operation of the vacuum pump, vibration.
(3) The connecting pipe of the vacuum pump and the system should be sealed reliably. For small vacuum pumps, metal pipe connecting gaskets can be used for oil-resistant rubber. For small vacuum pumps, vacuum hoses can be used. The pipe diameter must not be smaller than the suction diameter of the vacuum pump, and the required piping is short. And less elbows. (Welding slag in the pipe should be removed when welding the pipe. Welding slag is forbidden to enter the vacuum pump chamber.)
(4) In the connection line, users can install valves and vacuum gauges above the inlet of the vacuum pump and check the ultimate pressure of the vacuum pump at any time.
(5) Connect the power supply according to the motor's signage, and connect the grounding wire and fuses and thermal relays of appropriate specifications.
(6) When the vacuum pump is energized for trial operation, the motor belt must be removed to confirm that the direction of the vacuum pump is in compliance with the prescribed direction before putting it into use, so as to prevent the reverse pumping of the vacuum pump. (Turn to the direction indicated by the hood)
(7) For the vacuum pump with cooling water, connect the cooling water as required.
(8) When the solenoid valve is installed in the vacuum pump port, the valve and the vacuum pump should act simultaneously.
(9) When the vacuum pump exhaust gas affects the working environment, the exhaust pipe can be attached to or attached to the oil mist filter.
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