Patent ID: 6643927
Filing Date: 2003-11-11
Classification: B60T,F04C,Y10T

Abstract:
A method for assembling a pump equipment having a drive shaft and first and second rotary pumps, wherein the first rotary pump is comprised of first rotors to be rotated by the drive shaft, a first cylindrical center plate, first and second cylinders and a first pump room constructed by putting the first cylindrical center plate between the first and second cylinders for containing the first rotors therein, and the second rotary pump is comprised of second rotors to be rotated by the drive shaft, a second cylindrical center plate, the second cylinder, a third cylinder and a second pump room constructed by putting the second cylindrical center plate between the second and third cylinders for containing the second rotors therein, and, further, wherein the first cylinder, the first cylindrical center plate, the second cylinder, the second cylindrical center plate and the third cylinder are piled up and integrated, comprising the steps of:piling up the first cylinder, the first cylindrical center plate, the second cylinder, the second cylindrical center plate and the third cylinder; applying a laser beam, as a spot welding, to a part of the respective peripheral borders of the first cylinder, the first cylindrical center plate, the second cylinder, the second cylindrical center plate and the third cylinder; and final welding all around the respective peripheral borders of the first cylinder, the first cylindrical center plate, the second cylinder, the second cylindrical center plate and the third cylinder.