Structure of Centrifugal Separator 



179 



cream without stopping the machine, thus making 

 the separation continuous. 



This constituted the first practical cream separator. 

 It was the invention of Dr. Gustaf de Laval, a 

 Swedish inventor. 



The various parts 

 of the machine have 

 since been much 

 improved in minor 

 details. At the pres- 

 ent time the essen- 

 tial parts of a sepa- 

 rator are the bowl, 

 with or without 

 internal devices or 

 arrangements to as- 

 sist in the separa- 

 tion of the cream 

 from the milk, an 

 outlet for the skimmed milk, an outlet for the cream, 

 an inflow for the whole milk, and the proper mechani- 

 cal means for revolving the bowl. (The more com- 

 mon types of separator bowls are shown in Figs. 

 10-13.) Usually the bowl is driven in an upright 

 position, but there are separators in which the bowl 

 is driven in a horizontal position, and in the greater 

 number of machines the walls of the bowl are cylin- 

 drical. In the process of separation the milk flows 

 into the bowl, and, partaking of the centrifugal force, 

 is forced to the extreme outer edge of the bowl. 

 As the milk continues to flow in, the bowl begins 



Fig. 21. Dr. Ghistaf de Laval, inventor of the 

 first practical centrifugal cream separator 



