Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Method for a hydrodynamic pump shaft sleeve

IP.com Disclosure Number: IPCOM000126991D
Publication Date: 2005-Aug-16
Document File: 3 page(s) / 76K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a hydrodynamic pump shaft sleeve. Benefits include improved functionality, improved performance, and improved reliability.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 55% of the total text.

Method for a hydrodynamic pump shaft sleeve

Disclosed is a method for a hydrodynamic pump shaft sleeve. Benefits include improved functionality, improved performance, and improved reliability.

Background

      Liquid cooling-type systems have a pervasive problem with pump reliability. Small form-factor pumps primarily fail due to bearing damage and failure from frictional wear between the shaft and the bearing.

              Conventionally, many pump suppliers use high-speed rotation to create hydrodynamic layers that reduce the frictional wear. A hydrodynamic layer is produced when the shaft speed is sufficient, typically from 10k-20k RPM. The layer eliminates the physical contact between the shaft and bearing. However, the frictionless barrier does not yet exist when the pump is started and stopped. As a result, some frictional wear occurs. Additionally, the high spinning speed can cause a lot of noise (see Figure 1).

      Many pumps incorporate more complicated bearings, such as ball bearings. Within a liquid cooling system, ball bearings cause a lot of drag within the pump. They are expensive to manufacture for very small form-factors. All conventional bearing types have frictional wear, which eventually leads to failure.

General description

              The disclosed method includes two sets of magnetic arrays configured within a shaft and sleeve bearing as part of a pump. One set is imbedded with the wall of the bearing. All of the negative polarities face the center of the circle. Another magnetic array is embedded within the shaft with all of the negative polarities facing outward toward the bearing. This configuration causes the shaft to be self-centered within the bearing.

              The key elements of the disclosed method include:

•             Two sets of magnetic arrays

      -             A shaft with embedded magnets

      -             A bearing with embedded magnets

•             Magnets must be set in an array around the bearing/shaft with similar polarities facing each other, causing them to repel each other and centers the shaft within the bearing

•             Optional electromagnetic configuration that adds force

Advantages

              The disclosed method provides advantages, including:
•             Improved functionality due to providing a hydrodynamic s...