The piston vacuum pump is equipped with a pneumatic mechanism, which can speed up the extraction of steam without contaminating the oil. Such as when the rotary piston vacuum pump only smoke in addition to the permanent gases, gas liquefaction due to pressure increase, no pump oil degradation, but if you want to used for vacuum dry or moist air, is not only have a permanent gases and water vapor in the gas, if use without gas ballast valve pump take out this part of the water vapor, steam will be liquefied and dissolved in oil, the vacuum properties of oil degradation, and thus reduce the pumping speed of vacuum pump and vacuum degree.
The compression process of water vapor is further described as follows:
1. be pumped in addition to water vapor, should be in indoor compression, compression until the exhaust valve opens, if the assumption of temperature in the rotary piston vacuum pump is 60 ℃, temperature of the water in this saturated vapor pressure of 20000 Pa (149). 4), once the pressure is reached in compression in the process of water vapor condensation beginning to water, but the 20000 Pa (149.4) can’t open the exhaust valve, because the rotary piston vacuum pump exhaust valve leads to the atmosphere and exhaust valve spring pin (exhaust valve spring is calculated at 1.2 KGF/cm2), which is the rotary piston vacuum pump pump cavity internal pressure to compress to 120000 Pa to (900) or more to get pushed open the valve, the water vapor after the compression, the compression stage have all condenses into water, and mixed with oil.
2. in order to meet the requirements of moist air ejector, but not oily water pollution, so the town of rotary piston vacuum pump is equipped with gas institutions, its principle is to add a certain amount of air in the process of compression in order to improve the pressure of the mixed gas, mixed gas pressure as the sum of air pressure and water vapor pressure in the steam partial pressure has yet to reach the pump under the temperature of saturated steam pressure, the mixed gas pressure more than exhaust valve and open the valve, the steam too late in the rotary piston vacuum pump H pump cavity were outside the discharge pump liquefied.
3. piston vacuum pump air ballast valve can be used for another purpose to restore the ultimate pressure of vacuum pump. Although sometimes we used to take in addition to the general air, containing less non-condensable gas, usually air valve is closed, but when the time is long, oily but was polluted by air contains a small amount can be non-condensable gas, for no gas ballast institutions pump, only change new oil, or the heat oil pump, let the liquefied steam evaporation pump can resume the original extreme pressure, but for rotary piston vacuum pump gas ballast pump, as long as open the gas ballast valve operation 1 to 2 hours of restoring the limit pressure of the vacuum pump.
4. piston vacuum pump air ballast valve operation is very convenient. When using the pneumatic valve, you can open the handwheel of the pneumatic valve. The opening degree of the handwheel can be adjusted. And vice versa. Therefore, how much the handwheel is opened depends on the degree of vacuum required by the user. Generally speaking, when the handwheel is fully opened, its vacuum degree is 13 Pa(10-1 bracket). If the user does not need to add air, the valve can be closed.
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