High pressure pump
AssigneeCarlisle Fluid Technologies, Inc.
InventorAlan Smith
Life of this patent
Estimating the term…
Abstract
A positive displacement pump for pumping a fluid mastic comprises a plurality of cylinders each having a piston arranged for reciprocal motion within the cylinder. Movement of the piston in a first direction draws the fluid into the cylinder and movement in a second, opposite direction pumps the fluid out of the cylinder. A variable speed electric motor is drivingly coupled to a cam arrangement providing a reciprocating drive to the pistons. The cam arrangement comprises cams shaped and arranged to drive each piston in the first direction over less than half of a rotational cycle and to drive each piston in the second direction over the remainder of the rotational cycle. The cams are arranged to drive the pistons out of phase with one another.
Claims13
A positive displacement pump for pumping a fluid mastic, the pump comprising:
- a plurality of cylinders each having a piston arranged for reciprocal motion within the cylinder, whereby movement of the piston in a first direction draws the fluid into the cylinder and movement in a second, opposite direction pumps the fluid out of the cylinder;
- and
- a variable speed electric motor drivingly coupled to a cam arrangement via a cam shaft and providing a reciprocating drive to the pistons, wherein the variable speed electric motor is an ac motor having an inverter and a forced convection fan arranged to provide cooling air to windings of the ac motor, and wherein the inverter has a closed loop vector drive control,
- wherein the cam arrangement comprises cams shaped and arranged to drive each piston in the first direction over less than half of a rotational cycle and to drive each piston in the second direction over the remainder of the rotational cycle,
- wherein the cams are arranged to drive the pistons out of phase with one another, and
- wherein the cam arrangement includes, for each piston, a first cam and cam follower and a second cam and cam follower, 180° out of phase with the first cam and cam follower relative to the cam shaft, wherein the first and second cam followers are connected to each other such that the distance between the first and second cam followers is always the same, and cam surfaces are shaped to ensure that the cam followers maintain contact with the respective cams at all times.
A positive displacement pump for pumping a fluid mastic, the pump comprising:
- a plurality of cylinders each having a piston arranged for reciprocal motion within the cylinder, whereby movement of the piston in a first direction draws the fluid into the cylinder and movement in a second, opposite direction pumps the fluid out of the cylinder;
- and
- a variable speed ac motor drivingly coupled to a cam arrangement via a cam shaft and providing a reciprocating drive to the pistons, wherein the variable speed ac motor has an inverter and a forced convection tan arranged to provide cooling air to windings of the variable speed ac motor, the inverter having a closed loop vector drive control, and wherein the cam arrangement includes, for each piston, a first cam and cam follower and a second cam and cam follower, 180° out of phase with the first cam and cam follower relative to the cam shaft, wherein the first and second cam followers are connected to each other such that the distance between the first and second cam followers is always the same, and cam surfaces are shaped to ensure that the cam followers maintain contact with the respective cams at all times.
Dependencies are inferred from the claim text.