Cooling apparatus with electromagnetic interference shielding function

1. Field of the Invention

The present invention generally relates to cooling apparatuses for dissipating heat of electronic devices, and particularly to a cooling apparatus with electromagnetic interference shielding function.

2. Description of Related Art

Electronic devices are widely used in our daily life. These electronic devices facilitate our working, living, and playing. Although many improvements have been made, there are still some difficulties in designing for effective heat dissipation and electromagnetic interference (EMI) shielding.

To reduce EMI among electronic elements, an EMI shield is used to enclose the electronic element thus attenuating EMI. However, electronic elements generate a lot of heat, which must be dissipated before the electronic element is damaged or destroyed.

A cooling apparatus is generally used to dissipate heat generated by electronic elements. There are typically two types of cooling apparatuses. A first type cooling apparatus uses a heat sink with fins, attached to the electronic element, for absorbing and conducting heat. A second type cooling apparatus uses a fan and a fan duct to dissipate the heat. The fan duct has an outlet in which the electronic element is placed. The fan produces an airflow that takes the heat generated by the electronic element out the outlet via the fan duct.

It is difficult to shield EMI and dissipate heat at the same time. Regarding the EMI shielding technology, the shield prevents heat from escaping. Regarding the first type cooling apparatus, the fins act as antennas that enhance EMI. Regarding the second type of cooling apparatus, EMI can be travel out through the outlet.

Therefore, a cooling apparatus with EMI shielding function is needed in the industry to address the aforementioned deficiencies and inadequacies.

A cooling apparatus is used for cooling an electronic element. The cooling apparatus includes a fan and a fan duct. The fan is for generating airflow. The fan duct including an inlet, an outlet, and a first metal net fixed in one of the inlet and the outlet, is for guiding the airflow. The inlet is for allowing air to enter the fan duct. The outlet is for allowing air to flow out from the fan duct. The first metal net defines a plurality of guiding holes for the airflow to pass through, and a maximum distance in a traverse direction of each of the guiding holes is smaller than one twentieth of a wavelength of an electromagnetic wave emitted from the electronic element. An electronic device using the cooling apparatus is also disclosed.

Other systems, methods, features, and advantages of the present cooling apparatus and the present computer will be or become apparent to one with skill in the art upon examination of the following drawings and detailed description. It is intended that all such additional systems, methods, features, and advantages be included within this description, be within the scope of the present device, and be protected by the accompanying claims.

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

FIG. 1 is an assembled, isometric view of a cooling apparatus of a computer in accordance with an exemplary embodiment;

FIG. 2 is an exploded, isometric view of the cooling apparatus and an electronic element for being cooled;

FIG. 3 is an assembled, isometric view of the cooling apparatus but viewed from another aspect;

FIG. 4 is an assembled, isometric view of the cooling apparatus but viewed from an opposite aspect to the view of FIG. 3 ; and

FIG. 5 is an assembled, isometric view of the cooling apparatus assembled in the computer as shown in FIG. 1 but viewed from another aspect.

Reference will now be made to the drawings to describe a preferred embodiment of the present cooling apparatus.

Referring to FIGS. 1 and 2 , a cooling apparatus 700 , in accordance with an exemplary embodiment, is configured for cooling an electronic element 500 including a heat source 410 , such as a CPU, a power supply, etc., positioned in a housing 800 of a computer 999 . The cooling apparatus 700 includes a fan duct 100 , a fan 200 , a supporting device 300 , and a shield 400 . The fan duct 100 is for enclosing the electronic element 500 . The fan 200 is for generating airflow to flow through the fan duct 100 thereby dissipating heat away from the electronic element 500 . The supporting device 300 is for supporting and fixing the fan duct 100 . The shield 400 is for shielding electromagnetic waves emitted from the electronic element 500 in the housing 800 .

Referring also to FIG. 4 , the fan duct 100 may be a hollow pipe with a square section. The fan duct 100 includes an inlet 110 at one end, an outlet 120 at the other end, and two first clipping members 130 respectively formed at two opposite side walls of the fan duct 100 . A first opening 140 is defined in another side wall of the fan duct 100 between the opposite side walls. Two metal nets 121 are respectively fixed In the inlet 110 and the outlet 120 .

The fan 200 is fixed abutting the metal net 121 in the inlet 110 , to generate airflow flowing into the fan duct 100 via the inlet 110 and out the fan duct 100 via the outlet 120 .

The supporting device 300 includes a rectangular frame 310 , four fasteners 320 , and two second clipping members 330 . Four legs 312 extending from corners of the frame 310 , and the fasteners 320 extending through the legs 312 respectively. The frame 310 includes four interconnecting beams 311 , and a second opening 314 is defined in a center of the frame 310 and surrounded by the four beams 311 . Each leg 312 extends away from a corresponding corner of the frame 310 . The second opening 314 corresponds to the first opening 140 , and the electronic element 500 can be received into a passage in the fan duct 100 through the first and second openings 140 , 314 . Alternatively, the electronic clement 500 comprises a beat sink 420 with a plurality of parallel fins 422 mounted thereon and received into the passage of the fan duct 100 . Each fastener 320 is set in a hole (not labeled) defined in each leg 312 , to fix the frame 310 onto a board 810 in the housing 800 . Two second clipping members 330 are respectively formed on two opposite beams 311 , to engage with the first clipping members 130 to fasten the fan duct 100 to the supporting device 300 (referring to FIG. 3 ).

The shield 400 is set around the outlet 120 of the fan duct 100 . The shield 400 is made of conductive materials, such as copper, aluminum, steel, etc.

Each metal net 121 defines a plurality of through guiding holes 122 therein for the airflow to pass through. A maximum distance In a traverse direction of each guiding hole 122 is smaller than one twentieth of a wavelength of an electromagnetic wave emitted from the electronic element 500 , preferably smaller than one percent of the wavelength of the electromagnetic wave emitted from the electronic element 500 . A depth of each guiding hole 122 is comparatively great enough to deflect the electromagnetic wave many times, thus attenuating the electromagnetic wave. The holes 122 are arranged in an array type, such as a honeycomb type, a network type etc.

When assembling the cooling apparatus 700 into the housing 800 , the fan 200 is fixed abutting the metal net 121 in the inlet 110 and then the fan duct 100 is mounted onto the supporting device 300 , with each first clipping member 130 latched with a corresponding second clipping member 330 . Referring also to FIG. 5 , the fan duct 100 is inserted into a sidewall 820 of the housing 800 , and the outlet 120 is engaged with the sidewall 820 in an opening 822 defined in the sidewall 820 . The frame 310 is fixed onto the board 810 by fastening the fasteners 320 to the board 810 .

As shown in FIG. 1 , alter assembly, the shield 400 is fixed to the sidewall 820 to enclose a gap between the outlet 120 and the sidewall 820 . Because the shield 400 seals the gap, the shield 400 has a great effect in preventing EMI between the electronic devices located within the computer 999 and other exterior electronic devices located at outside of the housing, i.e., shielding the electronic element 500 covered by the fan duct 100 from electromagnetic waves emitted from the exterior electronic devices and preventing electromagnetic waves generated by the electronic element 500 covered by the fan duct 100 from radiating to the outside of the housing 800 .

It should be emphasized that the above-described preferred embodiment, is merely a possible example of implementation of the principles of the invention, and is merely set forth for a clear understanding of the principles of the invention. Many variations and modifications may be made to the above-described embodiment of the invention without departing substantially from the spirit and principles of the invention. All such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and be protected by the following claims.