In shenzhen, which aspects should be considered when the water ring vacuum pump of choose and buy? - - - - - -

( 1) Choose water ring vacuum pump

the so-called water ring vacuum pump is the use of water as the liquid ring pump liquid ring. Water will be used for liquid ring has many advantages, such as cheap, easily available and does not pollute the environment. However, there is a big drawback, because water vapor pressure of water ring vacuum pump suction pressure is very high. At this point, if be used for low vapor liquid liquid ring, can improve the ultimate vacuum pump. If the system with larger exhaust pressure of the water pump in 10, is in the water will be used for the liquid ring, must add a normal pressure pump as the backing pump of roots pump. If be used for mineral oil liquid ring, it should not be necessary. Big air pump can be used as a backing pump, can simplify equipment.

( 2) System with pump performance and commitment to the discharge pressure of

equipment performance depends largely on the promise of roots pump discharge pressure. The accepted value is lower, water ring vacuum pump will be used as the backing pump of the less likely. If the value of the promise of roots pump 1 ~ 10 Torr, then whatever single-stage or multistage water ring vacuum pumps, extreme pressure is much higher than the value, so it is not possible to it with the roots pump. Atmospheric pressure pump. If the promise of roots pump discharge pressure is greater than 100 Torr, the former stage water ring vacuum pump can also be used as a roots pump of the pump before the pump, the pump before it will greatly increase.

( 3) Use case

some kind of chemical fiber products production process is: will strip slicing boring (low molecular polymers The use of roots pump - Water ring vacuum pump unit for vacuum drying) - - - - - - Draft - Drafting, heating - Textiles - Products.

one of the important steps is 5 * 5 * 5 (dry mm) Slice for drawing. The ideal situation is in the process of wire drawing make moisture content is zero. In fact, this goal cannot be achieved. Therefore, require moisture content is 0. Less than 02%. If the moisture content is over this requirement under high temperature and high pressure wire drawing will decompose polymers and affect product strength.

use of roots water pump Water ring vacuum pump evacuation system equipment of the unit.

the functions of the main equipment is as follows:

( 1) Vacuum valve close vacuum valve, and the vacuum degree necessary to keep boring system, device is suspended.

( 2) When sudden stop unit, automatic pneumatic relief valve can prevent the water ring vacuum pump system of the water back to the roots pump and the vacuum drying system.

( 3) A cop valve unit running, the first to start the water ring vacuum pump. Spreads between the ends of the valve gradually appear when the pressure difference, when reaches a certain value, the valve will open automatically, so most of the gas flow into the water ring vacuum pump in the system. When the atmosphere through large pump gradually into the water ring vacuum pump, the differential pressure at the ends of the valve gradually reduced, so the valve closed, thus big pump start running. The function of differential pressure valve is shorten the pre operation of large air pump. Take your time.

( 4) Water level gauge have the effect of check valve, in order to prevent water backflow of water ring vacuum pump.

operating sequence is as follows: first of all, start the water ring vacuum pumps, gas in the system from the roots pump diameter ( At this time will push roots pump rotor) Enter the water ring vacuum pump side by side on the steam - The atmosphere of the water separator. When the positive pressure of 50 Torr, start the roots water pump 2. When the positive pressure of 20 Torr, start the roots pump. The system pressure can reach 0. 088, can often keep in under 1.

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