Cooling system or electronic apparatus, and electronic apparatus using the same
An electronic apparatus, such as, personal computers of so-called a desktop type and a notebook type, as well as, a server, etc., having a cooling system being high in cooling efficiency, wherein a CPU 200 in need of cooling is installed within a hosing 100, and the liquid cooling system for cooling the CPU, comprises: a heat-receiving (cooling) jacket 50; a radiator 60; and a circulation pump 70, wherein the heat-receiving (cooling) jacket 50, for transmitting heat generated from a heat-generation element, i.e., the CPU, into a liquid coolant flowing with in an inside thereof, has a heat diffusion plate 90 attached on the lower surface thereof. This heat diffusion plate encloses an operating fluid 94, such as water, within a space, which is hermetically sealed and formed within an inside thereof, and also has heater elements 95, being provided in contact with a portion the operating fluid. To those heater elements 95 are supplied a pulse-like electric power. With this, a portion of the operating fluid repeats forming/extinguishing, to give vibration to the operating fluid, thereby diffusing the heat over the entire of the diffusion plate, as a whole, thereafter the heat is transmitted to the heat-receiving (cooling) jacket. Or, alternatively, it may be connected with a heat radiation fin 300.
The present invention relates to an electronic apparatus, such as, a personal computer, being so-called a desktop-type or a notebook-type, or a server, etc., and in particular, it relates to an electronic apparatus having a liquid cooling system therein, being able to cool down a heat-generation element mounted within an inside thereof, such as, a semiconductor integrated circuit (IC), effectively with an aid of a liquid refrigerant or coolant, as well as, the cooling system thereof.
In order to maintain a normal operation thereof, cooling is necessary for the heat-generation element, such as, the semiconductor IC element, being mounted within an electronic apparatus, including a personal computer, of so-called the desktop-type or the notebook-type, as well as, a server, etc., and in particular, the heat-generation element, such as, a CPU (Central Processing Unit), as a representative one thereof, for example. For this reason, conventionally, such the cooling is achieved generally by using, a heat transfer element, being so-called a heat sink that is formed with fins thereon, as well as a fan, being provided for sending a cooling air thereto. However, small-sizing and high integration of such the semiconductor IC element in recent years, such as the heat-generation element, brings about localization of the heat generating at the portion thereof within the heat-generation element, and also for this reason, attention comes to be paid onto a cooling system of a liquid type of using the liquid coolant therein, such as a water, for example, being high in the cooling efficiency thereof, in the place of the conventional cooling system of an air-cooling type.
Namely, with the liquid cooling system of being high in the cooling efficiency thereof, which is used in the personal computer, of s-called the desktop-type or the notebook-type, and also the server, etc., as is known from the following patent documents 1-5, for example, in general, an element being so-called by a heat-receiving (or cooler) jacket is mounted on the surface of the heat-generating element, i.e., the CPU, directly, while conducting the liquid coolant within a flow passage formed within the heat-receiving jacket, so as to transmit or convey the heat generated from the CPU to the coolant flowing within the jacket mentioned above, thereby cooling down the heat-generating element with high efficiency. Further, in such the cooling system of the liquid-cooling type, normally, a heat cycle is made up with the cooler jacket, as the heat-receiving portion thereof, and in more details thereof, it comprises a circulation pump for circulating the liquid coolant mentioned above within the cycle, so-called a radiator, being a heat-radiation portion for irradiating heat of the liquid coolant mentioned above into an outside, and further a coolant tank provided in a part of the cycle depending on the necessity thereof. And, those are connected through a tube made of a metal and/or an elastic material, such as rubber or the like.
On the other hand, conventionally, as an apparatus for diffusing (or conducting) heat generated from the heat-generation body, such as, the semiconductor element, etc., which is installed within the electronic apparatus, there is already known a heat diffusion plate, for example, in the following patent document 6; wherein, for example, a groove or gutter is formed in a loop-like manner upon each of connection surfaces between an upper plate and a lower plate, which are made of material having high thermal conductivity, and both of those plated are piled and bonded with each other, opposing those grooves to each other, thereby forming a heat pipe in an inside thereof.
In addition thereto, in general, it is already known, with a heat transmission element for transmitting heat from the heat-generation body, that driving of fluid enclosed within an inside thereof transmits the heat. For example, in the apparatus disclosed in the following patent document 7, for the purpose of transmitting the heat from a print circuit board, on which a plural number of semiconductor elements (i.e., the heat-generation bodies), a part of the formed liquid passage comprises a means, being made up with a capillary and having a heating means in a part thereof, and the heater means heats the liquid within the capillary in the pulse-like manner, to cause bumping, thereby driving the liquid mentioned above due to a sudden or abrupt increase of pressure accompanying the vaporization when the bumping occurs. Further, regarding the principle of conducting the heat with using the vibration of liquid is described, in the details thereof, in the following non-patent document 1, for example. Also, the following non-patent document 2 discloses the structure, in particular in
Patent Document 1: Japanese Patent Laying-Open No. 2003-304086 (2003);
Patent Document 2: Japanese Patent Laying-Open No. 2003-22148 (2003);
Patent Document 3: Japanese Patent Laying-Open No. 2002-182797 (2002);
Patent Document 4: Japanese Patent Laying-Open No. 2002-189536 (2002);
Patent Document 5: Japanese Patent Laying-Open No. 2002-188876 (2002);
Patent Document 6: Japanese Patent Laying-Open No. 2002-130964 (2002);
Patent Document 7: Japanese Patent Laying-Open No. Hei 7-286788 (1995);
Non-Patent Document 1: Mamoru Ozawa, et al., “Promotion of Heat Conduction through Vibration of Liquid” pp228-235, Vo. 50 No.530 (1990-10), Articles of Japan Machinery Academic Association (B edition); and
Non-Patent Document 2: Z. J. Zuo, L. R. Hoover and A. L. Phillips, “An integrated thermal architecture for thermal management of high power electronics”, pp317-336, Thermal Challenges in Next Generation Electronic System (PROCESSINGS OF INTERNATIONAL CONFERENCE THERMES 2002), SANTA FE, N.M., USA, 13-16 Jan. 2002.
However, with such the cooling system of liquid cooling type, according to the conventional art, which was applied in the personal computers, of so-called the desktop type and the notebook type, and the server, etc., cooling of the heat-generation body, such as, the CPU, for example, is achieved by mounting it directly on the above-mentioned heat-receiving (or cooling) jacket having high cooling effect, however in general, the heat-generation body, i.e., the CPU comes to be small, in particular, on the surface area thereof, accompanying high integration of the semiconductor elements in recent years. On the contrary to this, the heat-receiving (or cooling) jacket has a large surface area due to the structure thereof; e.g., the liquid coolant flows within the flow passage formed with in the inside thereof, therefore, the area is very small, upon which the heat-generation element, i.e., the CPU is in contact with, comparing to the surface area of the heat-receiving (or cooling) jacket.
In this manner, in a case where the area is small, upon which the heat-generation body, or the CPU is in contact with, comparing to that of the heat-receiving (or cooling) jacket, the heat generated within the CPU diffused into the contact surface between the heat-receiving (or cooling jacket) and also the peripheral portion thereof, and thereafter it is conducted to the liquid coolant flowing within the jacket, thereby being discharged into an outside. However, in the case where that contact surface is small in the area thereof, even though the heat diffuses also to the peripheral portion thereof, more or less, but it cannot diffuse to the entire of the jacket, therefore the cooling efficiency of the heat-generation element is lowered by means of the heat-receiving (or cooling) jacket. Thus, at a position relatively far from the contact position with the CPU, the conduction of the heat generation cannot be obtained sufficiently, to the liquid coolant flowing within the jacket, and therefore, only a part of cooling capacity is utilized, but without using the, cooling capacity, fully, by means of the heat-receiving (or cooling) jacket.
SUMMARY OF THE INVENTIONTherefore, an object, according to the present invention, by taking the problems in such the conventional arts into the consideration, in more details, is provide a cooling system, being suitable for use in the personal computers, such as, called by the desktop type and/or the notebook type, and also the server, etc., and enhancing or increasing the cooling efficiency thereof with using a heat transmission/diffusion element, in which heat transmission/diffusion is promoted or facilitated through vibration of the heat-conductive liquid filled within an inside of a heat-conductive member, as well as, an electronic apparatus having such the cooling system therein.
Thus, according to the present invention, for accomplishing such the object mentioned above, firstly, there is provided a cooling system for an electronic apparatus, installing a semiconductor element within a housing, which necessitates cooling for maintaining normal operation thereof, in a part of the housing, having: a heat diffusion element being connected with the semiconductor element, thermally, wherein said heat diffusion element comprises: a plate-like member of heat conductive material, enclosing therein an operating liquid having large latent heat; and an actuator being provided in a part of the plate-like member, for vibrating said operating liquid having large latent heat, wherein: said heat diffusion element mounts said heat-generating semiconductor element on one side surface, while transporting heat generated from said heat-generation semiconductor element to other side surface of said heat diffusion element, thereby conducting heat transmission from said other side surface.
Also, according to the present invention, in the cooling system for an electronic apparatus as described in the above, it is preferable that a heat radiation plate is attached on the other side surface of said heat diffusion element, or that a cooling jacket is attached on the other side surface of said heat diffusion element, being thermally connected with said semiconductor element, thereby transmitting the heat generated therein to a liquid coolant vibrating within an inside of said cooling jacket, so as to conduct the cooling upon said semiconductor. Also, according to the present invention, in the cooling system for an electronic apparatus as described in the above, it is preferable that the actuator for vibrating the operating liquid filled within said heat diffusion element is made up with a heater wire wound around periphery of two (2) pieces of supporting bodies, and in particular, it is preferable that said heater wire is made from a nichrome wire. Further, according to the present invention, in the cooling system for an electronic apparatus as described in the above, it is also preferable that said actuator made up with the heater wire wound around the periphery of said two (2) pieces supporting bodies is disposed within an inside of said plate-like member, so that it dips in said operating fluid filled therein, near to said other surface thereof, or that hydrophilic treatment is conducted on a portion, on a surface of interior wall of said one side surface in said plate-like member, in vicinity of said actuator.
Next, according to the present invention, for accomplishing such the object mentioned above, there is provided an electronic apparatus, installing a heat-generating semiconductor element within a housing thereof, which requires cooling for maintaining normal operation there, and having a cooling system, within said housing or in a part thereof, comprising: a cooling jacket, being thermally connected with the semiconductor element, for transmitting heat generated from to a liquid coolant flowing within an inside thereof; a radiator for discharging the heat transmitted to the liquid coolant in said cooling jacket into an outside; and a circulation pump for circulating said liquid coolant in a loop, including said cooling jacket and said radiator therein, wherein: said cooling jacket is in contact with a surface of said heat-generating semiconductor element through a heat diffusion means for diffusing the heat generated from said heat-generating semiconductor element.
And, according to the present invention, in the electronic apparatus descried in the above, it is preferable that said heat diffusion means for diffusing the heat generated from said heat-generating semiconductor element into said cooling jacket comprises a hermetically sealed space for enclosing an operating fluid having large latent heat to be vibrated within an inside thereof, and is made up with a plate-like member having a surface shape being almost similar to that of said cooling jacket and being superior in heat conductivity, wherein an actuator is provided in a portion thereof, for vibrating said operating fluid, while dipping in said operating fluid. Also, according to the present invention, in the electronic apparatus descried in the above, it is preferable that in a part of said hermetically sealed space of said heat diffusion means, into an inside of which is enclosed the operating fluid having the large latent heat to be vibrated, is provided a buffer portion for enclosing a gas therein. Further, according to the present invention, in the electronic apparatus descried in the above, it is preferable that said hermetically sealed space of said heat diffusion means, into an inside of which is enclosed the operating fluid having the large latent heat to be vibrated, are formed in a plural number thereof and in parallel with each other, and also each of those is connected through said buffer portion, thereby forming a comb-like shape. And, also according to the present invention, in the electronic apparatus descried in the above, it is preferable that said heat diffusion means comprises a heating means provided in contact with a part of the operating fluid enclosed within said hermetically sealed space, and said heating means is supplied with pulse-like electric power, thereby providing vibration to said operating fluid.
Further, according to the present invention, for accomplishing such the object mentioned above, there is also provided an electronic apparatus, installing a heat-generating semiconductor element within a housing thereof, which requires cooling for maintaining normal operation there, and having a cooling system, within said housing or in a part thereof, comprising: a heat diffusion element, being connected with said semiconductor element, thermally; and a heat radiator, wherein said heat diffusion element comprises: a plate-like member of heat conductive material, enclosing therein an operating liquid having large latent heat; and an actuator being provided in a part of the plate-like member, for vibrating said operating liquid having large latent heat, whereby said heat diffusion element mounts said heat-generating semiconductor element on one side surface, while diffusing heat generated from said heat-generating semiconductor element, thereby transmitting the heat to the other side surface of said heat diffusion element; and said heat radiation plate is attached on the other side surface of said heat diffusion element, and transmitting the heat generated from said heat-generating semiconductor element, which is transported through said heat diffusion element, from a surface thereof into an outside.
BRIEF DESCRIPTION OF THE VARIOUS VIEWS OF THE DRAWINGThose and other features, objects and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings wherein:
FIGS. 8(a) and 8(b) are a cross-section view and an upper view, for showing the structure of the heat diffusion plate mentioned above, according to further other embodiment, in the cooling system of the electronic apparatus according to the present invention;
FIGS. 12(a) and 12(b) are an upper view and a side view for showing the detailed structure of the heater element mentioned above;
FIGS. 14(a) and 14(b) are a side view and a perspective view for showing a variation of the heater element mentioned above;
Hereinafter, explanation will be given on the embodiments according to the present invention, in details thereof, by referring to the drawings attached herewith.
First of all,
As shown in the figure, the main portion of the desktop type personal computer comprises a housing 100, which is formed from a metal plate into a cubic shape thereof, for example, and on a front panel portion 101 thereof are provided various kinds of switches; including an electric power switch and so on, and also indicator lamps, etc. Also, within an inside thereof is disposed a driver device 102, for driving various kinds of external information recording medium, such as, a floppy disk, a CD, and a DVD, etc., so that it positions an opening thereof on the front panel portion 101. Also, a reference numeral 103 in the figure depicts a memory portion provided within the housing 100 mentioned above, comprising a hard disk device, for example. And also, a reference numeral 104 in the figure depicts a cover to be put on the housing 100 mentioned above.
While on a rear side of the housing 100 is disposed an electronic circuit portion 105, having a liquid cooling system according to the present invention, and a reference numeral 106 in the figure depicts an electric power source portion for supplying from a commercial electric power source, a desired electric power to each of the portions, including, the driver device 102, the memory portion 103, and the electronic circuit portion 105 mentioned above.
Next, in
And, as is apparent from the figure, this electronic circuit portion 105 comprises the above-mentioned heat-receiving (or cooling) jacket 50 for mounting the CPU thereon, a radiator portion 60 for radiating heat generated from the CPU into an outside of the apparatus, a pump 70 for building up a cooling system, and further flow passages are formed by connecting tubes (conduits) 81, 82 . . . , being made of a metal, or an elastic material, such as a rubber or the like, being covered with a metal film, etc. on the outer surface thereof, so as to prevent the liquid coolant inside from leaking outside, for conducting a liquid coolant (for example, a water, or a water mixed with a so-called anti-freezing solution, such as, propylene glycol, at a predetermined ratio) to each of those portions building up the heat cycle. Also, in a part of the radiator portion 60 mentioned above, there are attached with plate-like shaped fans 62, 62 . . . (in a plural number, such as, three (3) pieces, in the present example), directing into an outside of the apparatus, for blowing wind onto a large number of fins 61, as the constituent element of the radiator portion, thereby radiating the heat transmitted from the heat receiving jacket 50 mentioned above, compulsively.
Namely, as apparent from the figure, the radiator portion 60 mentioned above is connected to the circulation pump 70 by means of the tube (conduit) 81, and is further connected to the heat-receiving jacket 50 through the tube (conduit) 82, thereafter is connected to the radiator portion 60 mentioned above, thereby forming a loop turning back thereto. Namely, with an aid of operation of the circulation pump 70, within the liquid circuit mentioned above circulates the above-mentioned water, or the mixture thereof with the anti-freezing solution, as the liquid coolant.
And, in
On the other hand, the heat diffusion plate (the heat spreader) 90 is also made of a plate-like member, being made of a metal, etc., having high heat conductivity, and as is apparent from the figure, so as to be in contact with the lower surface of the heat-receiving jacket 50 mentioned above, it has a surface being same to that of the jacket 50 in the form/sizes thereof. And, on this heat diffusion plate 90, for example, on a surface thereof in contact with the heat-receiving jacket 50, in the example shown in the figure, are formed a plural number of grooves (or gutters) 91, 91 . . . , having a circular or rectangular shape in the cross-section thereof and being minute in the cross-section area (for example, around several mm2) thereof, in parallel with one side thereof, and further each of the plural number of those grooves 91 is connected to a common groove or gutter 92, which is formed at one end portion thereof (i.e., the left-lower side in the figure), to be so-called a buffer portion, respectively. Namely, attachment and fixation of this heat diffusion plate 90 onto the lower surface of the heat-receiving jacket 50 defines a comb-like hermetically sealed space within an inside thereof, with the plural number of the passages 91, 91 . . . and the buffer portion 92. Further, in that instance, grooves or gutters 91, 92 may also formed on the lower surface side of the heat-receiving jacket 50, being similar to those mentioned above, to be located opposing to each other when they are bonded together. Also, among of those closed spaces, in particular, within an inside of each of those passages 91, 91 . . . is enclosed a fluid (i.e., an operation fluid 94), having a large latent heat, such as, a water (i.e., pure water) or the like, representatively, for example, though will be explained in more details thereof, hereinafter.
Also, at the other end portion thereof (i.e., the right-upper portion in the figure), so-called heater elements 95, 95 . . . are disposed, respectively, to build up heating members, the details of which will be explained hereinafter. In the figure, there is also shown conductor lines 96, for supplying the pulse-like heating electric power to those heater elements 95, 95 . . . , and also a pulse electric power generating circuit 97. And, as was mentioned in the above, the heat-receiving jacket 50, being assembled together with the heat diffusion plate 90 in one body is attached, for example, on the CPU 200; i.e., the heat-generation element mounted on the printed circuit board 210, as shown in this figure, so as to be in contact with the surface of the CPU.
Also, charging of the operating liquid 94 mentioned above is conducted, by injecting the liquid coolant, such as the water, etc., as the operating fluid 94, into an inside of the plural number of passages 91 mentioned above, for example, when bonding the heat diffusion plate 90 mentioned above with the heat-receiving jacket 50 in one body. Alternatively, though not shown in the figure herein, however with provision of a communicating port between the passages 91 and the surface of the heat-receiving jacket 50, it is possible to charge the operation fluid 94 therefrom. However, upon charging of the operating fluid 94 therein, charging pressure is altered depending upon the characteristics of the operating fluid, or a gaseous phase portion of non-condensation gas (for example, an air) is mixed therein when charging it.
Next,
Following to the above, explanation will be made about the conducting (or diffusing) function of heat in the heat diffusion plate (i.e., the heat spreader) 90, the structure of which was explained in the above, by referring to
First, when the electric power is supplied in pulse-like manner from the pulse-like electric power generating circuit 97 mentioned above, it is converted into heat on the nichrome fine wire 952 of the heater element 95 shown in
In this manner, with supplying of the pulse-like electric power mentioned above, continuously, to the nichrome fine wire 952 building up the heater element 95, the operating fluid 94 enclosed in the inside at the end portion of the passage 91 (i.e., at the position where the heater element 95 is provided) repeats the generation and extinction of the bubble 94a due to the generation and extinction of the vapor thereof. And, at the time when this bumping occurs due to the abrupt increase of pressure accompanying the vaporization thereof, and also expansion of the bubble accompanying therewith, the operating fluid 94 is vibrated with the vibration generated. Namely, accompanying the vibration of the operating fluid 94 within the passage 91, the heat from the CPU 200 mentioned above is transmitted/diffused on a plane thereof, first with the function of this heat diffusion plate (i.e., the heat spreader) 90.
Namely, as is shown in
However, with the embodiment mentioned above, in particular, the heat diffusion plate (i.e., the heat spreader) 90, it was explained that the fine wire 952 building up the heater element 95 thereof is made from the nichrome wire, in particular, because of the excellent characteristics thereon, when generating the bubble within the operating fluid 94 through heating due to the pulse-like electric power thereto, however in the place of the structure thereof, for example, the heater element 95 may be made, by laminating a film of, such as, polysilicon or tantalum compound (TaN), etc., for example, through an insulation film (such as, SiO2 layer), i.e., in the form of a resistor film.
Following to the above,
Next, FIGS. 8(a) and 8(b) attached herewith shows the structure of the heat diffusion plate (i.e., the heat spreader) 90, according to further other embodiment of the present invention. Thus, in the further other embodiment, in the vicinity of a lower surface of the heat diffusion plate (i.e., the heat spreader) 90 are provided a plural number of temperature sensors 98, 98 . . . , and also the operating fluid 94 within each of the passages 91, which build up the heat diffusion plate 90, is driven/operated individually, in the structure thereof.
Namely, in the heat diffusion plate (i.e., the heat spreader) 90, according to this further other embodiment, the pulse-like electric power supplying circuit 97 detects a location of an increase of temperature upon the lower surface 99 of the heat diffusion plate 90, with using temperature detection signals from those temperature sensors 98, which are disposed within the substrate of the heat diffusion plate 90 mentioned above, and controls the driving electric power to be supplied to the heater element 95 provided in each of the passages 91, selectively. Thus, in the heat diffusion plate 90, the pulse-like electric power is supplied to (or drive) only the heat element 95 of the passage 91 corresponding to the portion where the temperature rises up locally. With this, it is possible to promote or enhance the heat transmission (or diffusion), not upon the entire of the heat diffusion plate, but only at the necessary portion thereof, thereby achieving the heat diffusion plate (i.e., the heat spreader) having an efficiency being much higher.
Next,
Also, in an example shown in
Namely, in the other example about the passage 91 formed within the heat diffusion plate (i.e., the heat spreader) 90, the groove making up the passage 91 is one (1) piece, and the heater element 95 for building up the driving means is also only one (1) piece, therefore it can be manufactured easily, and is suitable, in particular, for the heat diffusion plate (i.e., the heat spreader) being relatively small in sizes and cheap.
Next,
Also, as is apparent from
Next, FIGS. 13(a) and 13(b) attached herewith show the condition where the heater element 990 mentioned above is supplied with the pulse-like electric power, to be driven therewith.
First,
On the other hand,
However, in this instance, it can be considered that the operating fluid, i.e., the water will not turn back to the liquid (W), completely, after turning to the vapor S once, therefore this remains in the vicinity of the heater element in the form of the bubble. For this reason, it is desirable that the position of the heater element 990 be set at the position, appropriately, confirming through an experiment or the like, so that the heating surface thereof comes to be in contact with the condensed liquid (W) with certainty. Also, as mentioned above, if the hydrophilic treatment is conducted, through such as, the roughing, etc., on a portion of the wall surface of the groove 91, the liquid (W) can be condensed on that portion, easily. For this reason, it is preferable to conduct such the hydrophilic treatment on the surface of the heater element 990 (in particular, the heater wire), too.
Next,
Also,
Following to the above,
Further,
Although the explanation was made, mainly, only about the actuator, as a means for vibrating the operating liquid therewith, which is enclosed within the plural number of passages (i.e., the grooves) 91 formed within an inside thereof, for the purpose of transmitting (diffusing) the heat in the heat diffusion plate (i.e., the heat spreader) 90, it is a type of heating the operating liquid 94 by means of the heater element mentioned above, thereby generating bubbles, however, the present invention should not be restricted only to such the embodiments as were mentioned in the above. Thus, for example, as one of those applying such the heat driving method therein, in the place of the embodiment mentioned above, further it is also possible of (1) applying a gas to be the operating liquid, in the place of the liquid mentioned above, and thereby generate vibration through repetitive expansion/condensation of the gas due to heating/cooling thereof. Further, in such a case, a fluid having large latent heat is applied as the gas to be enclosed within the heat diffusion plate, in the similar manner to that mentioned above. Alternatively, it is also possible (2) to use a bimetal in combination with the heating means, thereby giving vibration to the operating fluid mentioned above. Further, in the similar manner, it is also possible (3) to use a shape memory alloy in a part thereof, thereby giving vibration to the operating fluid mentioned above. Also, differing from such the heat driving method mentioned above, however it is also possible to utilize a piezoelectric element, such as so-called a piezo-element, etc., for example, thereby giving vibration to the operating fluid mentioned above.
As was fully explained in the above, according to the present invention mentioned above, since it is possible to transmit the heat to the heat radiation plate or the cooling jacket, which is generated in the heat-generation element having a small surface area thereof due to small-sizing and high integration of an element, such as the CPU, etc., for example, with high efficiency, with using the heat diffusion element/means mentioned above, thereby improving the cooling efficiency of the heat-generation element.
Also, in particular, with attaching the heat diffusion element/means onto the heat radiation plate or the cooling jacket, so as to the heat generated from the heat-generation element through the heat diffusion element/means to the heat radiation plate or the cooling jacket, the heat is transmitted to the coolant of a gas or a liquid in contact therewith, to be discharged into an outside, after being transported/diffused widely over an sufficient region of the cooling jacket. In this manner, due to the function of the heat diffusion element/means mentioned above, the area can be increased remarkably, for the heat generated in the heat-generation element to be transmitted to the heat radiation plate or the cooling jacket, thereby improving the cooling efficiency of the heat-generation element.
In particular, in a case where the heat diffusion element is attached on the cooling jacket, within an inside of which the liquid coolant flows, the heat can be transmitted into the liquid coolant flowing within the cooling jacket, with certainty, even at the position relatively far from the position contacting with the CPU, therefore, it is possible to fully use the cooling capacity by means of the cooling jacket. And, such the cooling system is suitable to be used, in particular, in the electronic apparatus, such as, the personal computers of so-called the desktop type and the notebook type, as well as, the server, etc.
The present invention may be embodied in other specific forms without departing from the spirit or essential feature or characteristics thereof. The present embodiment(s) is/are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the forgoing description and range of equivalency of the claims are therefore to be embraces therein.
Claims
1. A cooling system for an electronic apparatus, installing a semiconductor element within a housing, which necessitates cooling for maintaining normal operation thereof, in a part of the housing, having:
- a heat diffusion element being connected with the semiconductor element, thermally, wherein said heat diffusion element comprises:
- a plate-like member of heat conductive material, enclosing therein an operating liquid having large latent heat; and
- an actuator being provided in a part of the plate-like member, for vibrating said operating liquid having large latent heat, wherein:
- said heat diffusion element mounts said heat-generating semiconductor element on one side surface, while transporting heat generated from said heat-generation semiconductor element to other side surface of said heat diffusion element, thereby conducting heat transmission from said other side surface.
2. The cooling system for an electronic apparatus, as described in the claim 1, wherein a heat radiation plate is attached on the other side surface of said heat diffusion element.
3. The cooling system for an electronic apparatus, as described in the claim 1, wherein a cooling jacket is attached on the other side surface of said heat diffusion element, being thermally connected with said semiconductor element, thereby transmitting the heat generated therein to a liquid coolant vibrating within an inside of said cooling jacket, so as to conduct the cooling upon said semiconductor.
4. The cooling system for an electronic apparatus, as described in the claim 1, wherein the actuator for vibrating the operating liquid filled within said heat diffusion element is made up with a heater wire wound around periphery of two (2) pieces of supporting bodies.
5. The cooling system for an electronic apparatus, as described in the claim 4, wherein said heater wire is made from a nichrome wire.
6. The cooling system for an electronic apparatus, as described in the claim 4, wherein said actuator made up with the heater wire wound around the periphery of said two (2) pieces supporting bodies is disposed within an inside of said plate-like member, so that it dips in said operating fluid filled therein, near to said other surface thereof.
7. The cooling system for an electronic apparatus, as described in the claim 4, wherein hydrophilic treatment is conducted on a portion, on a surface of interior wall of said one side surface in said plate-like member, in vicinity of said actuator.
8. An electronic apparatus, installing a heat-generating semiconductor element within a housing thereof, which requires cooling for maintaining normal operation there, and having a cooling system, within said housing or in a part thereof, comprising:
- a cooling jacket, being thermally connected with the semiconductor element, for transmitting heat generated from to a liquid coolant flowing within an inside thereof;
- a radiator ford is charging the heat transmitted to the liquid coolant in said cooling jacket into an outside; and
- a circulation pump for circulating said liquid coolant in a loop, including said cooling jacket and said radiator therein, wherein:
- said cooling jacket is in contact with a surface of said heat-generating semiconductor element through a heat diffusion means for diffusing the heat generated from said heat-generating semiconductor element.
9. The electronic apparatus descried in the claim 8, wherein said heat diffusion means for diffusing the heat generated from said heat-generating semiconductor element into said cooling jacket comprises a hermetically sealed space for enclosing an operating fluid having large latent heat to be vibrated within an inside thereof, and is made up with a plate-like member having a surface shape being almost similar to that of said cooling jacket and being superior in heat conductivity, wherein an actuator is provided in a portion thereof, for vibrating said operating fluid, while dipping in said operating fluid.
10. The electronic apparatus descried in the claim 9, wherein in a part of said hermetically sealed space of said heat diffusion means, into an inside of which is enclosed the operating fluid having the large latent heat to be vibrated, is provided a buffer portion for enclosing a gas therein.
11. The electronic apparatus descried in the claim 10, wherein said hermetically sealed space of said heat diffusion means, into an inside of which is enclosed the operating fluid having the large latent heat to be vibrated, are formed in a plural number thereof and in parallel with each other, and also each of those is connected through said buffer portion, thereby forming a comb-like shape.
12. The electronic apparatus descried in the claim 9, wherein said heat diffusion means comprises a heating means provided in contact with a part of the operating fluid enclosed within said hermetically sealed space, and said heating means is supplied with pulse-like electric power, thereby providing vibration to said operating fluid.
13. An electronic apparatus, installing a heat-generating semiconductor element within a housing thereof, which requires cooling for maintaining normal operation there, and having a cooling system, within said housing or in a part thereof, comprising:
- a heat diffusion element, being connected with said semiconductor element, thermally; and
- a heat radiator, wherein said heat diffusion element comprises:
- a plate-like member of heat conductive material, enclosing therein an operating liquid having large latent heat; and
- an actuator being provided in a part of the plate-like member, for vibrating said operating liquid having large latent heat, whereby said heat diffusion element mounts said heat-generating semiconductor element on one side surface, while diffusing heat generated from said heat-generating semiconductor element, thereby transmitting the heat to the other side surface of said heat diffusion element; and
- said heat radiation plate is attached on the other side surface of said heat diffusion element, and transmitting the heat generated from said heat-generating semiconductor element, which is transported through said heat diffusion element, from a surface thereof into an outside.
Type: Application
Filed: Mar 5, 2004
Publication Date: Aug 18, 2005
Inventor: Osamu Suzuki (Chiyoda)
Application Number: 10/792,721