Displacing device

Abstract

A displacement device for fluids, in particular liquids has linearly movable displacement bodies which dip into pump chambers and are connected via respectively one connecting rod to crank pins of an externally driven crank shaft, wherein at least two groups of displacement bodies are provided. All the groups each have the same number of displacement bodies and the crank pins for the displacement bodies are arranged distributed around the crank shaft at the same angular distances. The crank pins assigned to one group are arranged with respect to those of the other group each offset by an offset angle β around the crank shaft. Furthermore, the displacement bodies of each group are arranged offset in the axial direction of the crank shaft with respect to those of the other groups and the group displacement bodies are each arranged around the crank shaft at a group offset angle γ with respect to one another. The displacement device enables low pressure pulsations.

What is claimed is: 
     
         1 . A displacement device for fluids, in particular liquids, comprising linearly movable displacement bodies which dip into the displacement device and are each connected via a connecting rod to crank pins of an externally driven crank shaft, wherein
 at least two groups (A; B) of displacement bodies are provided,   all the groups each have an equal number of displacement bodies,   the crank pins for the displacement bodies are arranged distributed around the crank shaft at the same angular distances (α),   the crank pins assigned to one group (B) are arranged around the crank shaft with respect to those of the other groups (B) in each case offset by an offset angle (β),   the displacement bodies of each group (B) are arranged in the axial direction of the crank shaft offset with respect to those of the other groups (A) and   the groups (A; B) of displacement bodies are each arranged offset to one another by a group offset angle (γ) around the crank shaft.   
     
     
         2 . The displacement device according to  claim 1 , characterized in that two groups (A; B) of displacement bodies are provided and that the displacement bodies of one group (B) are arranged alternately with the displacement bodies of the other group (A) in the axial direction of the crank shaft. 
     
     
         3 . The displacement device according to  claim 2 , characterized in that the two groups (A; B) of displacement bodies are arranged in a boxer arrangement, wherein the group offset angle (γ) is 180°. 
     
     
         4 . The displacement device according to  claim 1 , characterized in that each group comprises three displacement bodies each arranged at the angular distance (α) of 120°. 
     
     
         5 . The displacement device according to  claim 1 , characterized in that the offset angle (β) is 30°. 
     
     
         6 . A displacement device for fluids, in particular liquids, comprising linearly movable displacement bodies which dip into the displacement device and are each connected via a connecting rod to crank pins of an externally driven crank shaft, wherein
 a drive is provided with two opposite output shaft ends to which respectively one crank shaft of a displacement pump is coupled, which in each case comprises a group (A; B) of displacement bodies,   the two groups (A; B) of displacement bodies have an equal number of displacement bodies,   the crank pins for the displacement bodies (A; B) of each group are arranged offset with respect to one another around the appurtenant crank shaft at the same angular distances (α); and   the crank pins of one group (B) are arranged offset with respect to those of the other group (A) by an offset angle (β) around the appurtenant crank shaft.   
     
     
         7 . The displacement device according to  claim 6 , characterized in that the output shafts and the crank shafts are aligned with one another. 
     
     
         8 . The displacement device according to  claim 6 , characterized in that the two groups (A; B) of displacement bodies are arranged offset with respect to one another around the crank shafts by a group offset angle (γ). 
     
     
         9 . The displacement device according to  claim 6 , characterized in that each group (A; B) comprises three displacement bodies which are each arranged distributed around the appurtenant crank shaft at the angular distance (α) of 120°. 
     
     
         10 . The displacement device according to  claim 6 , characterized in that the offset angle (β) of the crank pins of each crank shaft is 30°. 
     
     
         11 . The displacement device according to  claim 6  characterized in that the drive is an electric motor. 
     
     
         12 . The displacement device according to  claim 11 , characterized in that the electric motor has two opposite output shaft ends which are aligned with one another and which form the end parts of a continuous electric motor shaft.