Patent Description:
In the electric devices which are commercially available, components such as IGBT would generate heat thus becoming a heat source when functioning. To make sure the devices function properly, timely heat dissipation is necessary.

The current heat radiating system is basically consisted of fans and cooling fins, the cooling fins are fixed on the heat source, the fans rotate the air to blow off the heated air around the cooling fins and to bring in new air, thus exchanging heat. For example, <CIT> discloses an axial flow air bearing heat exchanger. To achieve good cooling effect, the cooling fins are generally large.

The invention provides a radiator according to claim <NUM>. Additional features are specified in the dependent claims.

Various disclosed embodiments include radiators and electric devices. In an embodiment of an radiator, comprising:
a radiating part, comprising:.

The radiating part is rotatable and able to exchange heat constantly with new fluid (e.g. air or cold water). At the same time, the rotation of the blades can expel the fluid with higher temperature and draw in fluid with lower temperature to perform new heat exchange, accelerating the contact speed of the fluid and the surface of the blades of the radiating part, resulting in a better heat exchange rate.

In an embodiment, a rotating shaft is arranged on the radiating part, the blades extend from the inner surface of the housing to the rotating shaft. The rotating shaft is able to rotate the radiating part as well as the blades, with better stability.

The radiator according to claim <NUM> further comprises a heat conductive fluid, the heat conductive fluid is in between the housing of the radiating part and the receiving section of the heat conductive part. Heat conductive fluid is adopted to diminish the thermal loss between the heat conductive part and the radiating part, resulting in a better heat conduction effect. At the same time, the airflow generated by the rotation of the radiating part is able to take off more heat thus improving the radiating effect.

In the radiator according to claim <NUM>, the heat conductive fluid is defined in between the housing of the radiating part and the receiving section of the heat conductive part by a sealed bearing, so that the heat conductive fluid would not leak out.

In an embodiment, the radiating part is fixed in the receiving section of the heat conductive part by a bearing. The bearing can be a sealed bearing or other kinds of bearings; the bearing is able to fix the radiating part in the receiving section, making sure there is a certain space between the radiating part and the receiving part, avoiding direct friction against each other.

In an embodiment, further comprising a power unit, the power unit is configured to rotate the radiating part, to better control the rotation of the radiating part.

In an embodiment, further comprising a power unit which is fixed with the rotating shaft of the radiating part, the power unit is configured to rotate the radiating part. The integral structure is more stable by when the rotating shaft is directly connected to the power unit, the power unit is able to rotate the housing and further rotate the blades.

In an embodiment, further comprising a holder which is configured to fix the power unit on the heat conductive part.

In the radiator according to claim <NUM>, heat pipes are buried inside of the shell of the heat conductive part to further improve the heat exchange rate.

The present invention also provides an embodiment of an electric device, including a heat source, further comprising the radiator according to any of the above-mentioned embodiments; the radiator is in contact with the heat source through the heat conductive surface. The radiating part is able to rotate and exchange heat constantly with new fluid. At the same time, the rotation of the blades can expel the fluid with higher temperature and draw in fluid with lower temperature to perform new heat exchange, accelerating the contact speed of the fluid and the surface of the blades of the radiating part, resulting in a better heat exchange rate without extra occupied volume of the electric device.

The foregoing has outlined rather broadly the features and technical advantages of the present disclosure so that those skilled in the art may better understand the detailed description that follows. Additional features and advantages of the disclosure will be described hereinafter that form the subject of the claims. Those skilled in the art will appreciate that they may readily use the conception and the specific embodiment disclosed as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Those skilled in the art will also realize that such equivalent constructions do not depart from the spirit and scope of the disclosure in its broadest form.

Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words or phrases used throughout this patent document: the terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation; the term "or" is inclusive, meaning and/or; the phrases "associated with" and "associated therewith," as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like. Definitions for certain words and phrases are provided throughout this patent document, and those of ordinary skill in the art will understand that such definitions apply in many, if not most, instances to prior as well as future uses of such defined words and phrases. While some terms may include a wide variety of embodiments, the appended claims may expressly limit these terms to specific embodiments.

For a more complete understanding of the present disclosure, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, wherein like numbers designate like objects, and in which:.

The numerous innovative teachings of the present application will be described with reference to exemplary non-limiting embodiments.

The inventor of the present invention finds out that in the heat dissipation system of the prior art, the efficiency of heat exchange is largely determined by the flow velocity of the air. The faster the air moves, the higher the heat exchange efficiency is, resulting in a better cooling effect. As shown in <FIG>, cooling fins <NUM> would remain static because they are fixed under the heat source <NUM>. Fans <NUM> would generate air flow while functioning which results in the fact that some cooling fins are close to the air passage while other cooling fins are far from the air passage. The air around those cooling fins which are close to the air passage moves faster thus leading to a higher heat exchange efficiency; the air around those cooling fins which are far from the air passage moves slower thus leading to a lower heat exchange efficiency. Therefore, the overall heat exchange of the heat dissipation system is unable to achieve the optimal efficiency. Meanwhile, to achieve better heat dissipation capability, the cooling fins are often large, making the volume of the electric device large accordingly.

The present application provides an embodiment of a radiator, comprising a radiating part and a heat conductive part, wherein, the heat generated by the heat source can be conducted to the radiating part by the heat conductive part, and the radiating part is able to rotate. When the radiating part rotates, fluid can be drawn into one end of and then blown out at the other end resulting in higher heat exchange efficiency.

In the embodiments of the present application, air is used as an example to illustrate how the radiator rotates and draws the fluid from one end then blows out the fluid from the other end. However, the specification should not be read as limiting the invention of the exemplary air as described below, but to encompass other kinds of fluid such as cold water, fluid of room temperature, etc. The radiating part is able to draw in and discharge such fluid when rotating, thus cooling down the temperature.

As shown in the embodiment of <FIG>, the radiating part <NUM> includes a housing <NUM> and a set of blades <NUM> arranged on the inner surface of the housing <NUM>. When the housing <NUM> rotates, the blades <NUM> would rotate along with the housing <NUM>, so that the air with lower temperature from outside can be drawn in.

The heat conductive part <NUM> has a shell <NUM>. A heat conductive surface <NUM> which is in contact with the heat source <NUM> is arranged on the shell <NUM> so that the heat generated by the heat source can be conducted to the heat conductive part <NUM>. Meanwhile, the heat conductive part <NUM> has a receiving section <NUM> with two open ends; the receiving section <NUM> can be approximately defined by the shell <NUM>, so that the radiating part <NUM> can be put into the receiving section <NUM>.

In this way, the radiating part <NUM> can be rotateblely fixed in the receiving section <NUM> of the heat conductive part <NUM>, a bearing <NUM> can be adopted to fix the radiating part <NUM> in the receiving section <NUM> so that there would be a certain space between the radiating part <NUM> and the receiving section <NUM>, avoiding direct friction against each other while remaining fixed.

The heat conductive part <NUM> conducts heat to the radiating part <NUM> and further to the blades <NUM> by the air, when the radiating part <NUM> rotates, the air can be drawn into one end of the receiving section <NUM> and then blown out at the other end by the blades <NUM>.

Heat conductive material <NUM> (e.g. silicone grease) as shown in the figure can also be applied in place of air. Heat conductive material <NUM> is of higher heat conducting efficiency and lower thermal loss. Heat conductive material <NUM> can be filled in between housing <NUM> of the radiating part <NUM> and the receiving section <NUM> of the heat conductive part <NUM>, and then sealed by the bearing <NUM>. Under such circumstances when heat conductive material <NUM> is adopted, the heat from the heat conductive part can be better conducted from the heat conductive part and further to the blades of the radiating part.

A power unit <NUM> which is capable of rotating the radiating part <NUM>, for example, a motor, can be arranged on the heat conductive part <NUM> through a holder <NUM>, so that the rotation of the radiating part <NUM> is in better control.

<FIG> illustrates that a rotating shaft <NUM> is arranged inside of the radiating part <NUM> with the blades <NUM> extending from the inner surface of the housing <NUM> to the rotating shaft <NUM>. Although the integral structure can be more stable by adopting the rotating shaft <NUM> as shown in <FIG>, the rotating shaft <NUM> can be optional. As shown in <FIG>, the blades <NUM> of the radiating part <NUM> protrude from the inner surface of the housing <NUM> without the rotating shaft being installed. The housing <NUM> includes a connecting part that connects the power unit (not shown in the figure), the power unit rotates the housing and further rotates the blades.

In the circumstance that blades are arranged between the rotating shaft and the inner surface of the housing, it is also possible to further arrange some blades on the inner surface of the housing protrudingly, or further arrange some blades on the rotating shaft, or further arrange some blades both on the inner surface of the housing protrudingly and on the rotating shaft.

To further improve the heat conductive efficiency, as shown in <FIG> and <FIG>, heat spreading parts such as tubes <NUM> can be buried in the shell <NUM> of heat conductor <NUM>.

As shown in <FIG>, heat source <NUM> is in contact with the heat conductor <NUM> through the heat conductive surface <NUM>; the heat is conducted from the shell <NUM> of the heat conductor <NUM> to the radiating part <NUM>. The blades <NUM> are arranged on the housing <NUM> so that the heat can be conducted from the housing <NUM> to the blades <NUM>, at the same time, the heat conductive material <NUM> can better conduct the heat on the heat conductor <NUM> further to the blades <NUM> of the radiating part <NUM>. The rotating shaft <NUM> of the radiating part <NUM> is fixed to the power unit <NUM>, the power unit <NUM> is able to rotate the radiating part <NUM>, thus exchanging heat with new air constantly. It greatly accelerates the contact velocity of the air against the surface of the blades of the radiating part, thus improving the heat exchange efficiency.

Claim 1:
A radiator, comprising:
a radiating part (<NUM>), comprising:
a housing (<NUM>); and
a set of blades (<NUM>) which are arranged on the inner surface of the housing (<NUM>);
a heat conductive part (<NUM>), comprising:
a shell (<NUM>), the shell (<NUM>) has a heat conductive surface (<NUM>) which is configured to be in contact with a heat source (<NUM>); and
a receiving section (<NUM>) with two open ends, the receiving section (<NUM>) is defined by the shell (<NUM>), and the receiving section (<NUM>) is configured to receive the radiating part (<NUM>);
heat conductive fluid (<NUM>), the heat conductive fluid (<NUM>) is defined in between the housing (<NUM>) of the radiating part (<NUM>) and the receiving section (<NUM>) of the heat conductive part (<NUM>) by a sealed bearing; and
heat pipes (<NUM>) buried inside of the shell (<NUM>) of the heat conductive part (<NUM>);
wherein, the radiating part (<NUM>) is rotatably fixed on the receiving section (<NUM>) of the heat conductive part (<NUM>), when the radiating part (<NUM>) rotates, fluid can be drawn into one end of the receiving section (<NUM>) and then blown out at the other end by the blades (<NUM>).