Single vane rotary vacuum pump with oil supply passage channel

Abstract

The invention provides an sliding contact single vane rotary vacuum pump in which an oil supply passage is placed in the centre of the rotating vane through which a lubricating oil flows, which provides oil distribution in the pump chamber with enhanced suction pressure of 39%; and the torque exertion by 2.86-7.63%, this helps in reducing the torque of the pump during maximum vacuum condition and results in reduction of the power consumption of the vacuum pump which in-turn decreases the net load on the automotive engine, thus reduces the peak torque, the pump internal chamber pressure and also results better vacuum suction performance.

We claim: 
     
         1 . A sliding contact single vane rotary vacuum pump ( 100 ), comprising:
 an open housing ( 1 ), covering the rotary vacuum pump ( 100 ) with provisions for assembling an air exit nozzle ( 8 ) and an inlet oil filter ( 17 );   a rotor ( 5 ) assembled via a coupling ( 6 ) with into the said open housing ( 1 ) having a radially movable vane ( 3 );   the vane ( 3 ) having vane slider ( 4 A and  4 B) slidably supported inside a recess of the said rotor ( 5 );   an end plate ( 2 ) to cover the said housing ( 1 ) using plurality of bolts ( 15 ), incorporating an o-ring ( 20 ) in between them to avoid any leakage;   wherein,   a centre relief hole ( 21  or  24 ) is provided in vane slider ( 4 A and  4 B) for oil distribution in the pump chamber with enhanced suction pressure of 39%; and the torque exertion by 2.86-7.63%.   
     
     
         2 . The single vane rotary vacuum pump ( 100 ) as claimed in  claim 1 , wherein centre relief hole ( 21  or  24 ) in vane slider ( 4 A and  4 B) helps in achieving a suction pressure of 33.3 kPa in 5.18 seconds. 
     
     
         3 . The single vane rotary vacuum pump ( 100 ) as claimed in  claim 1 , wherein centre relief hole ( 21  or  24 ) in vane slider ( 4 A and  4 B) exerts a torque of 0.752 N-m at 2000 RPM. 
     
     
         4 . The single vane rotary vacuum pump ( 100 ) as claimed in  claim 1 , wherein plurality of oil supply passages ( 22  and  23 ) are provided within vane ( 3 ) for oil flow distribution. 
     
     
         5 . A single vane rotary vacuum pump ( 100 ) as claimed in  claim 1 , wherein oil supply passages ( 22  and  23 ) within vane ( 3 ) are vertical passage, horizontal passage or any combination thereof. 
     
     
         6 . A single vane rotary vacuum pump ( 100 ) as claimed in  claim 1 , wherein oil supply passages ( 21  and  24 ) within vane slider ( 4 A and  4 B) is either round hole, oblong hole, square hole or any other geometrical cavity in centre which causes the relief in pressure level. 
     
     
         7 . A single vane rotary vacuum pump ( 100 ) as claimed in  claim 1 , wherein passage way ( 22  and  23 ) of vane ( 3 ) along with centre relief hole ( 21  or  24 ) in vane slider ( 4 A and  4 B) provides a channel which reduces the lubricant pressure from both the surfaces of vane ( 3 ) maintaining a steady state while operation.