| 摘要 |
The pump equipped with a plurality of cylinders has an improved structure for coupling the pistons to the crankshaft, in such a way that the number of parts conventionally used and the dimension of the resulting pump are reduced considerably in comparison with the pumps customary hitherto. The invention can be used both for continuous-flow pumps and for radial diaphragm pumps. The connecting rods comprise plates, each with a bore made through the thickness dimension of these and intended for receiving a cylindrical eccentric of the pump crankshaft. Provided at one end of each connecting rod is a generally cylindrical bore which likewise extends through the thickness dimension of the connecting rod and the centre of which is offset inwards from the end-edge face of the connecting rod at a distance which is smaller than the radius of the bore. A cylindrical connecting-rod pin with a flattening on its periphery can be inserted into the bore or recess at the end of the connecting rod, and when the connecting-rod pin is rotated so that its flattening is oriented parallel to the end edge of the connecting rod, it is locked on the spot, but so as to be pivotable within the recess. A bore made perpendicularly to the flattening of the pivotable connecting-rod pin is equipped with a thread for receiving a screw bolt, by means of which the piston rod is fastened to the connecting-rod pin. Further features of the pumps according to the present invention comprise a cylinder head which is designed for receiving sleeve-shaped inserts of different dimensions, so that pistons of different cross-sectional areas can be used, in order thereby to vary the capacity of the pump, and grooved shoulders on the connecting rods interact with holding rings on the crankshaft. |
