Pump for liquid cooling system

1. Field of the Invention

The present invention relates to a pump, and more particularly to a pump incorporating a pair of rotors for raising an operating efficiency thereof.

2. Description of related art

With continuing development of the computer technology, electronic packages such as the CPUs are generating more and more heat that is required to be dissipated immediately. The conventional heat dissipating devices such as combined heat sinks and fans are not competent for dissipating so much heat any more. Liquid cooling systems have thus been increasingly used in computer technology to cool these electronic packages.

A typical liquid cooling system comprises a heat absorbing unit for absorbing heat from a heat source, and a heat dissipating unit which is filled with liquid. The liquid conducts heat exchange with the heat absorbing unit, thereby taking away the heat of the heat absorbing unit when the liquid is circulated. Typically, a miniature pump is used to circulate the liquid in the liquid cooling system.

A conventional pump comprises a stator secured in a case, and a rotor rotatably mounted in the case and enclosing the stator. When an electric current is delivered to armature coils of the stator, a magnetic field is produced from the stator, and interacts with another magnetic field generated by a permanent magnetic sleeve of the rotor to repulse and attract the permanent magnetic sleeve, whereby the rotor is driven to rotate.

The magnetic field produced by the stator simultaneously distributes at an interior and an exterior of the stator. However, only the exterior part of the magnetic field can interact with the another magnetic field produced by the rotor, which results in the interior part of the magnetic field being wasted. The magnetic field being not able to be utilized sufficiently causes an operating efficiency of the pump limited.

What is needed, therefore, is a pump which can overcome the above-mentioned disadvantage.

A pump includes a base, a case fixed on the base, a stator embedded into the case, a rotor unit sandwiched between the base and the case. The rotor unit includes an inner rotor surrounded by the stator, and an outer rotor surrounding the stator. Magnetic fields produced by the stator have interior parts interacting with the inner rotor and exterior parts interlinking with the outer rotor. Therefore, the magnetic fields are able to be utilized sufficiently to drive the rotor unit to have a high speed rotation, and an operation efficiency of the pump is enhanced accordingly.

Other advantages and novel features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the present apparatus can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present apparatus. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is an assembled, isometric view of a pump in accordance with a preferred embodiment of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a view similar to FIG. 1 with a cover and a printed circuit board being removed for clarity;

FIG. 4 is a vertical sectional view of FIG.1;

FIG. 5 is a view of an operation principle of the pump of FIG. 1; and

FIG. 6 is a view of an operation principle of a pump in accordance with another embodiment of the present invention.

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Industry Class:
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