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Method for a peristaltic pump with programmable roller indexing

IP.com Disclosure Number: IPCOM000033140D
Publication Date: 2004-Nov-29
Document File: 4 page(s) / 76K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a peristaltic pump with programmable roller indexing. Benefits include improved functionality and improved performance.

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Method for a peristaltic pump with programmable roller indexing

Disclosed is a method for a peristaltic pump with programmable roller indexing. Benefits include improved functionality and improved performance.

Background

      Conventional peristaltic pumps produce a fixed volume of dispensed fluid. For the dispensing of volumes between values in this set, an entirely different peristaltic pump must be utilized. Material is pumped through the system in fixed-size pulses. Long-term pumping rate is determined by the rotation speed of the motor, and individual pulses are determined by the size of the tubing. As a result, no control is possible for single shots of material. This deficiency removes peristaltic pumps from serious consideration for dispensing polymers for controlled collapse chip collect (C4) assembly processes (see Figure 1).

      Conventionally, the problem is solved by using piston pumps and auger pumps for dispensing polymers, such as epoxy underfills and thermal interface materials (TIMs).

General description

      The disclosed method is a peristaltic pump with continuously variable pumping. The method

enables the user to gain the many benefits of peristaltic pumps.

              The key elements of the method include:

•             Normal mechanical action of the peristaltic roller assembly is relieved through action of an electronically controllable solenoid valve.

•             Pinch-tube valve is placed in-line before the roller assembly to isolate the input line from the output line when the roller assembly is released.

Advantages

              The disclosed method provides advantages, including:

•             Improved functionality due to enabling the use of peristaltic pumps

•             Improved functionality due to using a pinch valve that eliminates the risk of leaking through the pump during the roller-release phase of the dispensing sequence

•             Improved performance due to producing higher fluid-flow rates through enabling the use of larger tubing diameters

•             Improved cost effectiveness due to reducing set-up time

•             Improved cost effectiveness due to lowering maintenance costs

•             Improved cost effectiveness due to requiring low capital investment

Detailed description

      The disclosed method uses a peristaltic pump with continuous variable pumping in a single-shot pumping application. The method uses a single-roller (in place of multiple rollers) and an in-line pinch valve controlled by an electronic solenoid-actuated release mechanism (see Figure 2).

      The single-roller approach to the rolle...