Rotary compressor and method of operating a rotary compressor

Abstract

The invention proposes a method of operating a rotary compressor ( 1 ) with twisted rotors ( 10, 20 ) for compressing gaseous media, in which a gas-dynamic pulse is generated in the delivery chamber ( 4 ) flowed through in each case from an inflow side ( 4 ′) to an outlet side ( 4 ″) in the longitudinal direction of the delivery chamber by rapid separation from an area of enlarged volume (V), and a closing time (t S ) from separation of the relevant delivery chamber ( 4 ) flowed through in the longitudinal direction of the delivery chamber from the area of enlarged volume (V) to closure of the relevant delivery chamber ( 4 ) on the inflow side ( 4 ′) is such that the filling level of the delivery chamber ( 4 ) is increased by pulse charging.

1 . A method of operating a rotary compressor ( 1 ) with twisted rotors ( 10 ,  20 ) for compressing gaseous media, in which 
 a gas-dynamic pulse is generated in the delivery chamber ( 4 ) flowed through in each case from an inflow side ( 4 ′) to an outlet side ( 4 ″) in the longitudinal direction of the delivery chamber by rapid separation from an area of enlarged volume (V), and    a closing time (t S ) from separation of the relevant delivery chamber ( 4 ) flowed through in the longitudinal direction of the delivery chamber from the area of enlarged volume (V) to closure of the relevant delivery chamber ( 4 ) on the inflow side ( 4 ′) is such that the filling level of the delivery chamber ( 4 ) is increased by pulse charging.    
   
   
       2 . A method according to  claim 1 , characterized in that operation of the rotary compressor (I) is controlled by varying geometric influencing variables and/or the speed of the rotary compressor (I), taking account of the temperature and type of the gaseous medium.  
   
   
       3 . A method according to  claim 1  or  2 , characterized in that the rapid separation takes place within a separation time (tT) in which the rotors ( 10 ,  20 ) each pass through a rotation angle of the size of the angle of twist β, said time being less than twice the transit time (t L ) of the gas-dynamic pulse for passage through the relevant delivery chamber ( 4 ) in the longitudinal direction of the delivery chamber.  
   
   
       4 . A method according to  claim 1 , characterized in that the closing time (t S ) is less than 1.75 times the transit time (t L ).  
   
   
       5 . A rotary compressor ( 1 ) for compressing gaseous media, having 
 two twisted rotors ( 10 ,  20 ) surrounded by a housing ( 2 ), each with at least three vanes or splines ( 12 ,  14 ,  16 ,  22 ,  24 ,  26 ) for forming a number of delivery chambers ( 4 ) between the vanes or splines and the internal wall ( 2 ′) of the housing ( 2 ), and    at least partially axial, one-sided inflow of the gaseous mediums into a relevant delivery chamber ( 4 ) flowed through in the longitudinal direction of the delivery chamber and an area of enlarged volume (V) formed by delivery chambers,    wherein the geometric influencing variables and the speed of the rotary compressor ( 1 ), taking account of the temperature and type of the gaseous medium, are so adjusted to one another and are such that rapid separation of the relevant delivery chamber ( 4 ) from the area of enlarged volume (V) takes place to generate a gasdynamic pulse, and    a closing time (t S ) from separation of the relevant delivery chamber ( 4 ) from the area of enlarged volume (V) to closure of the relevant delivery chamber ( 4 ) on the inflow side ( 4 ) is such that the filling level of the relevant delivery chamber ( 4 ) is increased by pulse charging.    
   
   
       6 . A rotary compressor according to  claim 5 , characterized in that the geometric influencing variables and the speed of the compressor ( 1 ), taking account of the temperature of the gaseous medium, are so adjusted to one another and are such that 
 the closing time (t S ) is less than 1.75 times a transit time (t L ) of the gas-dynamic pulse for passage through the relevant delivery chamber ( 4 ) in the longitudinal direction of the delivery chamber, and    a separation time (t T ), in which the rotors ( 10 ,  20 ) each pass through a rotation angle of the size of the angle of twist (β), is less than twice the transit time (t L ).    
   
   
       7 . A rotary compressor according to  claim 5 , characterized in that an inflow opening ( 30 ) is provided, which makes possible, at least in phases and at least partially, inflow in the longitudinal direction of the delivery chamber into the relevant delivery chamber ( 4 ).  
   
   
       8 . A rotary compressor according to  claim 7 , characterized in that the inflow opening ( 30 ) is defined at least in places by a control edge ( 32 ), whose shape preferably approaches that of a vane or spline portion which passes in front of the control edge ( 32 ) when the rotary compressor ( 1 ) is in operation.  
   
   
       9 . A rotary compressor according to  claim 7 , characterized in that the inflow opening ( 30 ) has an adjustable geometry, the control edge ( 32 ) in particular being adjustable.  
   
   
       10 . A rotary compressor according to  claim 5 , characterized in that the separation time (t T ) is less than 1.75 times, preferably 1.5 times, particularly preferably 1.0 times, more particularly preferably 0.75 times, most preferably 0.5 times the transit time (t L ).  
   
   
       11 . A rotary compressor according to  claim 5 , characterized in that the ratio between the closing time (t S ) and the transit time (t L ) lies in the following ranges; 
 0.25<t S /t L <1.75;    preferably 0.50<t S /t L <1.50;    particularly preferably 0.75<t S /t L <1.25.    
   
   
       12 . A rotary compressor according to  claim 5 , characterized in that the geometric influencing variables comprise at least one or more of the following variables: 
 length of respective delivery chamber ( 4 ) in longitudinal direction of delivery chamber, construction and/or arrangement of inflow opening in respective delivery chamber ( 4 ), angle of twist (β) of rotors ( 10 ,  20 ),    number (n) of vanes or splines ( 12 ,  14 ,  16 ,  22 ,  24 ,  26 ) per rotor.