Low-friction reciprocating pump

Inactive Publication Date: 2006-03-02
LINCOLN INDUSTRIES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003] Among the several objects and features of the present invention may be noted the provision of a fluid pump which exerts less frictional force on the fluid being pumped; the provision of such a pump which effectively

Problems solved by technology

Unfortunately, UV ink is also sensitive to mechanical shear stress (i.e., friction) which produces heat and initiates solidification of the ink.
Consequently, solidified polymers form and accumulate in the pump which cause the pump to bind and

Method used

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  • Low-friction reciprocating pump
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  • Low-friction reciprocating pump

Examples

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Embodiment Construction

[0016] Referring now to the drawings and in particular to FIG. 1, a pump according to the present invention for delivering fluid to a device requiring fluid is indicated generally at 10. The pump 10 may be used, for example, in pumping ink from a supply container 12 (e.g., a drum) to fountains of a printing press 14. In one embodiment, the pump 10 is supported upon a follower plate 16 near the upper surface of fluid in the container 12. The plate 16 and pump 10 move downward in the container 12 as fluid is removed and the elevation of the upper surface of fluid is lowered. The pump 10 has a cylinder 20 which, in one embodiment, is oriented vertically with its lower end submerged in fluid of the container 12. The lower end of the cylinder has an opening comprising an inlet 22 for receiving fluid. A motor 24 is positioned above the pump for driving the pump, and a transverse outlet tube 26 extends away from the pump for delivery of fluid to the printing press 14. It is understood that...

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PUM

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Abstract

A reciprocating pump for pumping a fluid, especially for pumping a fluid such as UV ink which is subject to solidification when exposed to frictional forces. The pump has an internal displacement chamber with an inlet, and outlet, and a plunger which is reciprocally movable in the chamber. The plunger reciprocates through an axial passage in the housing at one end of the chamber, the passage being sized to receive the plunger with a clearance fit. First and second seals are positioned in the axial passage. Each seal is annular in shape and extends between the plunger and housing in sealing contact therewith. The pump housing is free from a bearing which contacts the plunger or guides its motion, such that the sealing contacts between the plunger and seals are the only contacts of the plunger in the housing.

Description

BACKGROUND OF THE INVENTION [0001] This invention relates to reciprocating pumps for pumping fluids, and more particularly to a pump which lengthens the operational life of the pump by reducing the frictional forces expended on the fluid being pumped. The pump is described primarily herein for application in pumping a fluid which is subject to solidification when exposed to frictional forces. However, it is understood that the pump and seal assembly may be applied to efficiently pump any type of fluid. [0002] Ink that is cured with ultraviolet (UV) energy has widespread use in the printing and graphic display industries. That type of ink is highly viscous and has a unique chemistry which requires special handling and pumping needs. Its material composition includes a monomer, instead of a solvent as in conventional inks, such that it solidifies when irradiated. Unfortunately, UV ink is also sensitive to mechanical shear stress (i.e., friction) which produces heat and initiates solid...

Claims

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Application Information

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IPC IPC(8): F04B53/10F04B39/10
CPCF04B53/16F04B53/164F04B53/162
Inventor KRETZINGER, HARALDARENS, THOMAS M.
Owner LINCOLN INDUSTRIES CORP
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