1) Rotary vane vacuum pump selection: To improve the pump speed, reduce wear and tear, reduce the temperature, to ensure the normal performance of the pump, one of the keys is how to properly select the stator and rotary vane pair of the main friction data. Commonly used pump rotary vane information for a new type of self-smooth material - carbon immersion gold. Some domestic seminar units also used for other materials as a comprehensive test, the results show that the use of carbon fiber reinforced plastic, polymer liquid crystal material for the rotary disc information has the development value. 2) Cavity shape of pump "Due to the friction and abrasion between the rotating plate and the stator of the high-speed direct-coupled pump and the increase of the temperature of the pump, the friction between the rotating plate and the pump chamber of the rotary plate pump is improved, the wear and smooth Is the key to develop a good performance direct-coupled rotary vane pump.After the analysis of the elastic fluid dynamic smoothing theory, it is found that the movement between the existing pump rotary vane and the pump cavity is not reasonable and the wear between the rotary vane and the rotor and the pump cavity is more serious , It is difficult to find the appropriate smooth conditions, resulting in high temperature rotary vane pump temperature increase.While dealing with the wear method is to make the rotary vane in the process of rotation has always insisted on the same length, while the current is circular pump chamber can not be done. It is theoretically possible to propose an envelope of the stator pump cavity profile which is an envelope tangent to the outside of the envelope circle on a series of axis-symmetric curves. Of course, The machining of the wire is more complicated than that of the regular circular shape, but it is costly to compensate for the improvement of the pump performance. (3) The pump, vibration, noise, temperature rise and abrasion are greatly reduced. (3) Rotor construction and rotation: through Pump geometry pumping speed calculation shows that when the pump speed has reached a certain high value, then increase the rotor can not increase the rotor eccentricity, without increasing the maximum linear velocity of the situation under the conditions of pumping speed in the structure Increasing the number of turns is also simple and feasible, so it is a promising way to improve pumping speed.At present, the domestic manufacturers to consume direct-coupled pump has a three-slot overall rotor structure, which is equipped with three rotary vane. Three rotary blade structure has high strength and rigidity; can reduce the rotor imbalance in high speed operation, in order to reduce the impact load received by the rotary blade.Pump geometry pumping speed calculation shows that the pump uses three slot rotor than the two slot rotor The pumping speed is 18 ~ 20%. The key to complete the construction of the multi-rotor is the revolution of the rotary vane and the pump chamber, such as the use of soft spin-on materials with good wear resistance, to strengthen the cooling of the pump, etc. 4) Eccentricity at the port-side location is a relatively new construction of the pump body. The side-off pump rotor has a point of contact with the pump cavity not at the top, but also at the side with the tank on the side. Pump compared to the following advantages: Since the oil level and the exhaust port on the side, and the oil just to the exhaust valve and smooth oil inlet hole swallowed, so stop the pump, only a little back to the oil in the pump Cavity, the other oil can only enter the oil hole into the pump can not enter into the pump back to the pump chamber due to the small amount of oil, so the pump easy to start, thus reducing pump motor power. At the same time, when the oil returns to the oil inlet hole, the oil inlet hole becomes a bleed hole, so that the gas pressure in the pump is equal to the external atmospheric pressure, preventing the oil from entering the vacuum system to form pollution. The position of the exhaust valve is reduced, the plane of the exhaust valve seat and the plane of the valve seat are nearly vertical, so that the height of the pump is reduced; the fuel tank outside the exhaust hole can be designed smaller; the required oil quantity also decreases so that the pump body has a compact structure; Is the degree of direction, and when the top outlet from the top is vertical, the direction of movement of gas molecules change, the road longer, the top of a large space, the gas molecules to reduce speed, energy loss, help to avoid fuel injection. If the exhaust port and the top of the exhaust tank set up space to install anti-oil pump to avoid the effect of the more ideal. Germany recently developed a large pumping speed high-speed direct-coupled eccentric rotor single-stage rotary vane pump. The structure of this pump has a great change compared with the rotary vane pump of the traditional structure: the rotor and the pump body are eccentric, the cutting point of the rotor and the pump chamber is below the pump chamber, and the fuel tank is located on the side of the pump body. This structure of the pump low center of gravity, smooth operation, the relative reduction of vibration and noise, for the manufacture of large rotary vane pump invented favorable conditions. The average pumping speed of $ 630F / FL rotary vane pump in Germany is 170L / s. The structure of the pump exhaust port located in the lower part of the pump, exhaust valve exhaust direction for the degree of direction, the exhaust side with the air deflector plate, damping screen and exhaust filter elements, both to avoid fuel injection and reduce noise. The pump is also equipped with gas ballast valve and oil circulation, oil cooling installation, pump temperature control system, so that the pump can be used to remove high temperature gas and extract a large amount of water vapor. At present, the German thunderstorm company has used this pump to replace the trochanter vacuum pump, commonly used in vacuum smelting and vacuum heat treatment equipment. Rotary vane pump there are many areas to be improved. Believe, with the progress of vacuum technology, better performance, to meet the requirements of a variety of rotary vane pump will be presented.
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