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1. (WO2013152568) PLUNGER PUMP

Pub. No.:    WO/2013/152568    International Application No.:    PCT/CN2012/079099
Publication Date: Fri Oct 18 01:59:59 CEST 2013 International Filing Date: Wed Jul 25 01:59:59 CEST 2012
IPC: F04B 53/00
F04B 1/047
F04B 9/02
Applicants: HU, Chuanshu
Inventors: HU, Chuanshu
Disclosed is a plunger pump, wherein at least two crank throws (5) are provided on a crankshaft (4), a connecting rod (6) is connected to the crank throws (5), and the other end of the connecting rod (6) drives a piston in an upward and downward reciprocating movement within a piston cylinder. There are at least two sets of connecting rod (6), piston and piston cylinder, each set comprising three, and the three connecting rods (6) of each set are fitted on the same crank throw (5), and the axes of the three piston cylinders of each set are not on the same plane. The piston cylinders of each set comprise a first cylinder (1), a second cylinder (2) and a third cylinder (3), wherein the axes of the first cylinder (1) and the third cylinder (3) form an acute angle with the vertical direction, and the second cylinder (2) is located between the first cylinder (1) and the third cylinder (3), the axis of the second cylinder (2) remaining vertical. A main axle support axle diameter (7) is provided between each crank throw (5) of the crankshaft (4), the outer diameter of the main axle support axle diameter (7) being no less than the diameter of the crankshaft (4). The plunger pump occupies less floor space and is more flexible in terms of places of use, the crankshaft is stronger and the service life is long.