Apparatus and method for thermoelectric cooling of an extraction fluid pump

US5738498A · kind A · utility

Assignee

• Isco, Inc. · US

Inventors

• Robert W. Allington · Lincoln, US
• Daniel G. Jameson · Roca, US
• Dale A. Davison · Waverly, US
• Dale L. Clay · Lincoln, US
• Robin R. Winter · Lincoln, US
• Yoossef Tehrani · Lincoln, US

Key dates

• Filing date: Jun 27, 1996
• Grant date: Apr 14, 1998
• Expiry date: Jun 27, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2035/0441
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a piston pump for pumping liquid carbon dioxide at a temperature below 30 degrees Fahrenheit and pressures at least as high as 7500 psi at an outlet flow rate in excess of 10 milliliters per minute, the inlet to the pump and the pumphead are each cooled by thermoelectric heat exchangers that are air cooled. The pump is a cam-driven, single-plunger pump with a cam profile that enables the pumping system to avoid distructive reverse torque on the cam, gear train and drive motor after the cam passes top dead center. The volume leaving the pump is determined by measuring only pressure or other parameter related to flow and movement of the plunger. The piston of the pump is supported on both sides of the seal and the support for the piston within the pumphead are machined consentrically and colinearly to the seal gland.