JP4742965B2 - Heat transfer device and liquid cooling system using it - Google Patents

Description

  The present invention relates to a cooling system for a heat generating electronic component such as a CPU using a heat transport means such as a heat pipe or a liquid cooling system in an electronic device, and more particularly to a structure of a heat transfer portion that dissipates heat of a cooling liquid.

  In recent years, the speed of integrated circuits such as CPUs used in personal computers, servers, game machines, and the like has increased, and the amount of heat generated has increased accordingly. Conventionally, a direct air cooling system in which a heat sink is fixed to a CPU, a fan is attached to the CPU, and the cooling air is blown onto the heat sink has been the mainstream in the past, but the space around the CPU has been reduced with the downsizing and higher density of electronic devices. As the heat sink size is limited, the cooling capacity is limited. For this reason, a cooling system using heat transport means such as a heat pipe or a liquid cooling system that can provide a heat radiating part at a free position, has a limited size, and can have a higher cooling limit than an air cooling system is a personal computer. It has begun to be applied to CPU cooling.

  As a conventional technique for cooling a heat generating electronic component such as a CPU using a heat pipe or a heat transport means of a liquid cooling system, there is one described in Patent Document 1.

  12 to 13 show a case where a heat pipe is applied as a heat transport means to the desktop personal computer described in Patent Document 1, and FIG. 14 shows a liquid cooling system.

  First, in FIGS. 12 and 13, the heat receiving head 110 is attached to the CPU 103 installed in the housing 1, and a fan 113 for exhausting the air inside the housing to the outside of the housing is provided on a part of the wall surface of the housing 101. Mounting, attaching the heat sink 112 having the base 112a and the fins 112b arranged on the base to the outside of the wall surface of the housing 101 facing the fan 113 or attaching the fin 112b toward the housing side by projecting outward from the wall surface, The heat sink 112 and the heat receiving head 110 are connected by a heat pipe 111.

  Further, the heat receiving header 131 attached to the CPU 103 in FIG. 14 has the same contact surface with the CPU 103 as the heat pipe in FIG. 12, but the cooling liquid flows inside, and the heat is transferred to the cooling liquid. It has become. The pump 132 is configured to circulate the coolant between the heat receiving header 131 and the heat sink 135. The tube 133 and the metal pipe 134 connect the heat receiving header 131 and the heat sink 135, and serve as a heat transport path between the heat receiving header 131 and the heat sink 135 by flowing a coolant inside. The heat sink 135 includes a base 135a and fins 135b. The coolant flows in the base 135a, and the heat of the coolant is transmitted to the entire base 135a. Further, a reserve tank 136 is provided in communication with the metal pipe 134.

  Here, the effect | action of the cooling system using the heat transport means of patent document 1 is demonstrated using the liquid cooling system of FIG.

  First, when the CPU 103 generates heat, heat is transmitted to the heat receiving header 131 attached to the CPU 103. At this time, heat is transmitted to the coolant flowing in the heat receiving header 131, and the coolant is transferred from the heat receiving header 131 to the base 135 a of the heat sink 135 by the pump 132 and radiated from the base 135 a and the fins 135 b of the heat sink 135. Then, after the cooled coolant passes through the reserve tank 136, it returns to the pump 132 again.

Next, when the fan 113 is operated, the air in the housing 101 flows in the direction of the fan 113. The air passes through the fins 135b of the heat sink 135, collides with the base 135a, and is discharged out of the housing 101. The heat transferred to the base 135a and the fins 135b of the heat sink 135 is released by this air flow. Here, the flow of wind hitting the heat sink 135, that is, the wind of the fan 113 is discharged while colliding against the base 135 a that is the hottest part of the heat sink 135. That is, since it becomes a collision jet, the heat dissipation efficiency is good.
JP 2004-116864 A

  However, in the conventional configuration as described above, since the discharge airflow of the fan is close to the base of the heat sink, the airflow resistance is increased and the air blowing performance is significantly reduced. Further, since the ventilation resistance is increased, the discharge airflow from the fan has a very small discharge direction component and almost a radial direction component, and does not become a collision jet flow to the base.

  Further, since the ventilation resistance is increased, the noise generated inside the fan is increased. Further, the noise is increased by overlapping with the noise caused by the collision flow, and is directly emitted from the heat sink portion outside the casing, so that the noise is increased.

  Therefore, the cooling method for heat generating electronic components such as CPUs using the heat transport means of Patent Document 1 requires a distance in the airflow discharge direction or an increase in size of the fan, especially when an axial flow type fan is used. End up.

  The present invention solves the above-mentioned conventional problems, and uses a heat transport means such as a liquid cooling system that exhibits a high heat dissipation capability in a thin and small volume even under conditions of high ventilation resistance and low noise. It is an object of the present invention to provide a heat transfer device for a cooling method of a heat generating electronic component such as the above.

In order to solve the above-described conventional problems, a heat transfer device according to the present invention includes a main plate, a plurality of moving blades attached in a circular shape on the main plate, and a suction port. An impeller composed of a side plate attached to a position facing the main plate, and a plurality of stationary blades arranged in a circle around the impeller, and discharged from the impeller between the stationary blades A diffuser in which a first flow path through which the air flows is formed, and at least one second flow path in which the fluid A flows is formed inside the stationary blade, and the stationary blade includes: The cross-sectional shape substantially perpendicular to the rotating shaft of the impeller is flat and curved in an arc shape, and a plurality of second flow paths through which the fluid A flows are provided in parallel .

  With this configuration, the airflow discharged in the radial direction from the impeller is smoothly decelerated in the first flow path formed between the stationary blades in the diffuser located on the outer periphery of the impeller, and the airflow discharged from the impeller Even if the dynamic pressure (kinetic energy) is efficiently converted to static pressure and the ventilation resistance is high, it is possible to suppress a decrease in the air volume.

  In addition, by smoothly decelerating in the first flow path in the diffuser, a flow with little separation is generated near the surface of the stationary blade, heat transfer on the air side is promoted, and the second surface inside the stationary blade is accelerated from the entire surface of the stationary blade. The heat of the fluid A flowing through the flow path can be radiated.

  Furthermore, since the airflow discharged from the impeller at the leading edge portion of the stationary blade does not collide as much as possible, an increase in noise caused by the collision flow in the diffuser can be suppressed, and noise emitted from the heat transfer device can be suppressed low. .

  The heat transfer device of the present invention is a fluid A which is a coolant in a stationary blade in a diffuser provided around an impeller in a cooling system for a heat generating electronic component such as a CPU using a heat transport means such as a liquid cooling system. By providing the flow path through which the air flows, even if the impeller and the diffuser provided around the impeller are thin and small in outer dimensions, both the blowing performance and the heat radiation amount as a radiator can be achieved as a blower.

  In addition, an increase in noise due to the collision of the airflow discharged from the impeller with the stationary blade can be suppressed to a small level. Furthermore, since the diffuser portion can efficiently convert from dynamic pressure to static pressure, the impeller portion can be made as thin and small as possible in order to obtain a predetermined blowing performance, and blowing noise can be kept low. Therefore, the noise emitted from the heat transfer device can be kept low. In addition, the cost of the components can be kept low.

The invention according to claim 1 is attached to a main plate, a plurality of moving blades arranged and mounted on the main plate in a circular shape, and a suction port and a position facing the main plate of the moving blades. And a plurality of stationary blades arranged in a circle around the impeller, and air discharged from the impeller flows between the stationary blades. The diffuser is formed with a flow path, and at least one second flow path in which the fluid A flows is formed inside the stationary blade. The stationary blade is substantially perpendicular to the rotation axis of the impeller. By providing a plurality of second flow paths in which the fluid A flows in parallel, the air flow discharged from the impeller in the radial direction is the outer periphery of the impeller. Smoothly decelerates in the first flow path in the diffuser located at It is converted, even at high ventilation resistance it is possible to suppress deterioration in air volume. Further, the flow of the separation is small in the vicinity of the surface of the stationary blade in the first flow path, heat transfer on the air side is promoted, and the heat of the fluid A flowing through the second flow path inside the stationary blade from the entire surface of the stationary blade. Can be dissipated.

  Furthermore, since the airflow discharged from the impeller does not collide as much as possible at the leading edge portion of the stationary blade, an increase in noise associated with the collision flow in the diffuser is suppressed, and in order to obtain a predetermined air blowing performance, The size of the diffuser portion can be made as thin and small as possible, and the noise emitted from the heat transfer device can be kept low.

Further, the stationary blade is provided with a plurality of second flow paths in which the fluid A flows in parallel, and the cross-sectional shape substantially perpendicular to the rotation axis of the impeller is flat and curved in an arc shape. By reducing the thickness between the second flow path through which the fluid A flows from the leading edge side to the rear edge side of the stationary blade and the first flow path through which air flows, the thermal resistance of the stationary blade is reduced. Heat can be radiated with higher fin efficiency, and the stationary blade can efficiently convert dynamic pressure to static pressure while keeping the outer diameter of the diffuser small by making the stationary blade arc.

According to a second aspect of the invention, before Kiseitsubasa is airfoil wing shape substantially the cross-sectional shape perpendicular to the axis of rotation of the impeller, a plurality of second flow path wherein the fluid A flows inside Since the equivalent diameter of the second flow path is larger toward the leading edge side of the airfoil-shaped vane, the lift characteristics as the vane are improved by the airfoil shape, and the dynamic pressure is more efficiently reduced. It converts into a pressure, and the aerodynamic performance as a fan of a heat transfer device improves. In addition, the air flowing in the first flow path is increased in velocity near the leading edge of the stationary blade, the heat transfer on the air side is promoted, and the equivalent diameter of the second flow path is increased to the front edge. Thus, the flow amount of the fluid A can be increased, and the heat dissipation of the fluid A on the leading edge side of the stationary blade can be promoted.

According to a third aspect of the present invention , the stationary blade has an airfoil-shaped cross section substantially perpendicular to the rotation axis of the impeller, and a plurality of second flow paths through which the fluid A flows are provided. A portion of the plurality of second flow paths is disposed on at least one of the pressure surface side and the suction surface side on the leading edge side of the blade of the airfoil blade shape. As a result, the lift characteristics are improved, the dynamic pressure is more efficiently converted into static pressure, and the aerodynamic performance of the heat transfer device as a blower is improved. In addition, the air flowing in the first flow path is increased at one end on both the pressure side and the suction side near the leading edge of the stationary blade, heat transfer on the air side is promoted, and the pressure on the leading edge is increased. Since the second flow path is provided on at least one of the surface side and the suction surface side, the amount of heat passing through the leading edge of the stationary blade increases and the heat dissipation of the fluid A at the leading edge of the stationary blade is further promoted. can do.

According to a fourth aspect of the present invention, a liquid cooling system is configured by using the heat transfer device having the structure according to any one of the first to third aspects, the heat receiving unit, and the fluid A transport device. By doing so, in the cooling system for heat generating electronic components such as a CPU using a liquid cooling system, the heat radiating portion is small and exhibits a large heat radiating capability, and noise can be further suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a side sectional view of a heat transfer device according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is an enlarged view of a main part of FIG. FIG. 4 is a configuration diagram of a liquid cooling system using the heat transfer device according to the first embodiment of the present invention.

  1 to 3, the heat transfer device 1 is provided with a main plate 2a, a plurality of blades 3 provided in a circular shape on the main plate 2a, inclined forward in the rotation direction, a suction port 2b, A sirocco-type impeller 4 composed of a side plate 2 c attached at a position facing the main plate of the blade 3, a bottom plate 5 a, a side plate 5 b, and a plurality of statically arranged around the impeller 4. A diffuser 8 having blades 6 and having a first flow path 7 in which air discharged from the impeller 4 flows between the individual stationary blades 6, and a scroll casing 9 containing the diffuser 8. ing. The stationary vane 6 has a cross-sectional shape that is substantially perpendicular to the rotation axis (not shown) of the impeller 4 and is curved in a circular arc shape, and has a second flow path 6x in which the coolant flows. A plurality are arranged in parallel.

  In FIG. 4, the heat transfer device 1 configures a liquid cooling system 15 by connecting a heat receiving head 11 attached to a CPU 10, a pump 12, and a reserve tank 13 with a tube 14.

  The operation of the heat transfer device 1 and the liquid cooling system 15 configured as described above will be described below.

  First, the operation of the heat transfer device 1 will be described. A sirocco-type impeller 4 is rotated by a motor (not shown) mounted on a rotation shaft of the main plate 2a, and a sirocco-type impeller 4 is provided on the main plate 2a and inclined forward in the rotation direction. A dynamic pressure is mainly applied to the air sucked from the suction port 2 b of the impeller 4, and an air flow is discharged to the outer periphery of the impeller 4.

  Here, the high-speed air flow discharged from the impeller 4 is smoothly decelerated in the first flow path 7 in the diffuser 8 while keeping the outer diameter of the diffuser 8 small by making the stationary blade 6 arc-shaped. Further, even if the dynamic pressure is efficiently converted to static pressure, and the speed is reduced smoothly and sufficiently by the scroll casing 9 and the ventilation resistance is high as a blower, it is possible to suppress a decrease in the air volume.

  Further, in the vicinity of the surface of the stationary blade 6 in the first flow path 7, the airflow is smoothly decelerated by the action of the diffuser 8, so that the flow becomes less separated and heat transfer on the air side is promoted. Furthermore, by reducing the thickness between the second flow path 6x in which the coolant flows from the front edge 6a side to the rear edge 6b side of the stationary blade 6 and the first flow path 7 in which air flows, the stationary blade The heat of the cooling water flowing through the second flow path 6x inside the stationary blade 6 can be radiated with high fin efficiency from the entire 6 surface.

  Furthermore, since the high-speed air flow discharged from the impeller 4 at the front edge 6a of the stationary blade 6 does not collide as much as possible, an increase in noise due to the collision flow in the diffuser 8 is suppressed, and a predetermined air blowing performance is obtained. Furthermore, the noise emitted from the heat transfer device 1 can be kept low.

  Next, the liquid cooling system 15 will be described. Heat is transmitted to the heat receiving header 11 attached to the CPU 10. At this time, heat is transmitted to the coolant flowing through the heat receiving header 11, and the coolant is transported from the heat receiving header 11 to the heat transfer device 1 by the pump 12 and radiated. The cooled coolant returns to the pump 12 again after passing through the reserve tank 13.

  Here, in the cooling method of the CPU 10 using the liquid cooling system 15 by the heat transfer device 1, the heat radiating part is small and exhibits a large heat radiating capability, and further noise can be suppressed.

  In the first embodiment of the present invention, the impeller 4 is a sirocco type, but the same effect can be obtained with other centrifugal type impellers such as a turbo type and a radial type.

(Embodiment 2)
FIG. 5 is an essential part enlarged view of a planar cross section of the heat transfer device according to the second embodiment of the present invention. FIG. 6 is an enlarged view of a main part of a planar cross section of another heat transfer device according to Embodiment 2 of the present invention. In addition, about the same structure as Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In FIG. 5, the stationary blade 16 has an airfoil-shaped cross section substantially perpendicular to the rotation axis of the impeller 4, and a plurality of second flow paths 17 through which the coolant flows are provided inside the stationary blade 16. The equivalent diameter of the second flow path 17 is made larger toward the leading edge 16a side of the airfoil-shaped stationary blade 16.

  Here, by making the stationary blade 16 into an airfoil shape, the lift characteristics are improved, the dynamic pressure is more efficiently converted into the static pressure, and the aerodynamic performance as the blower of the heat transfer device 1 is improved. Further, the air flowing in the first flow path 7 is increased in flow velocity at one end in the vicinity of the front edge 16a of the stationary blade 16 to promote heat transfer on the air side. By increasing the equivalent diameter of the flow path 17, the flow amount of the cooling water can be increased, and the heat radiation of the cooling water on the front edge 16 a side of the stationary blade 16 can be promoted.

  Further, as shown in FIG. 6, a part of the plurality of second flow paths 17 is arranged on at least the pressure surface 16a1 side and the negative pressure surface 16a2 side on the leading edge 16a side of the airfoil-shaped stationary blade 16 side. By providing, the amount of heat passing through the leading edge 16a of the stationary blade 16 increases, and the heat radiation of the coolant at the leading edge 16a of the stationary blade 16 can be further promoted.

  Although the second flow path 17 of the second embodiment is circular, the same effect can be obtained with an elliptical shape or other rectangular shape.

(Embodiment 3)
FIG. 7 is a side cross-sectional view of the heat transfer device according to Embodiment 3 of the present invention. 8 is a cross-sectional view taken along line BB in FIG. FIG. 9 is a side cross-sectional view of another heat transfer device according to Embodiment 3 of the present invention. 10 is a cross-sectional view taken along the line CC of FIG. In addition, about the same structure as Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  7 and 8, the stationary blade 18 has a cross-sectional shape that is substantially perpendicular to the rotation shaft (not shown) of the impeller 4 and is flat and curved in an arc shape, and is further divided into a plurality of rows in the radial direction of the diffuser 8. Is provided.

  Here, by decelerating in the first flow path 7 of the diffuser 8, air flow separation occurs particularly on the suction surface side of the stationary blade 18, and the separation area increases toward the outlet 7 b side of the first flow path 7. And the smooth deceleration of the diffuser 8 continues to the outlet 7b side of the first flow path 7, and the temperature boundary layer is also divided for each of the leading edges 18a of the stationary blades 18 divided into a plurality of parts. The heat radiation from the cooling water flowing in the second flow path 19 in the blade 18 also continues efficiently to the outlet 7b of the first flow path 7.

  Here, as shown in FIGS. 9 and 10, the stationary blade 20 is formed of a plurality of tubes 21 in which cooling water flows are arranged in close contact with each other in a substantially arc shape in the radial direction of the diffuser 8. As a result, the main stream of the airflow discharged from the impeller 4 is smoothly decelerated in the first flow path 7 in the diffuser 8 by the stationary blade 19 formed by a tube group arranged in close contact with a substantially arc shape. As a result, the dynamic pressure is efficiently converted to static pressure, and the decrease in air volume is suppressed. Further, in the vicinity of the tube group forming the stationary blade 20, the heat of the cooling water flowing in the tube 21 can be radiated with high fin efficiency over the entire surface of each tube 21.

  Although the second flow path 19 and the pipe 21 of the third embodiment are circular and circular, the same effect can be obtained by using an elliptical shape, a round tube, or other rectangular shapes.

(Embodiment 4)
FIG. 11 is a plan sectional view of the heat transfer device according to the fourth embodiment of the present invention. In addition, about the same structure as Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In FIG. 11, a plurality of third flow paths 22 connected to the second flow paths 6 x of the stationary blades 6 are provided in the vicinity of the surface on the first flow path 7 side of the bottom plate 5 a of the diffuser 8.

  As a result, the surface of the bottom plate 5a provided with the third flow path 22 becomes a heat radiating surface, the heat radiating area is greatly increased, and the heat radiated from the coolant can be greatly increased.

  In the fourth embodiment of the present invention, the third flow path is provided only on the bottom plate side. However, the same effect can be obtained if the third flow path is provided only on the side plate side. The heat radiation area can be further increased by doubling more than that.

  As described above, the heat transfer device according to the present invention can achieve both a large air blowing performance as a blower and a high heat radiation amount as a heat radiator with a small outer dimension as much as possible, and can further reduce noise. As well as electronic devices with AV, AV equipment, refrigeration and refrigeration equipment such as household refrigerator-freezers and vending machines, air-conditioning equipment for home and commercial use, heat pump equipment such as water heaters and washing and drying machines, It can also be applied to heat exchange units that forcibly exchange heat with air such as waste heat recovery equipment.

Side surface sectional drawing of the heat transfer device in Embodiment 1 of this invention AA line sectional view of FIG. 2 is an enlarged view of the main part of FIG. Configuration diagram of a liquid cooling system using the heat transfer device in Embodiment 1 of the present invention The principal part enlarged view of the plane cross section of the heat transfer device in Embodiment 2 of this invention The principal part enlarged view of the plane cross section of the other heat transfer device in Embodiment 2 of this invention Side surface sectional drawing of the heat transfer device in Embodiment 3 of this invention BB sectional view of FIG. Side surface sectional drawing of the other heat transfer device in Embodiment 3 of this invention CC sectional view of FIG. Plan sectional drawing of the heat transfer device in Embodiment 4 of this invention A perspective view showing a cooling method of a desktop personal computer using a conventional heat pipe The perspective view which shows the cooling part of FIG. A perspective view showing a conventional liquid cooling system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat transfer device 2a Main plate 2b Suction port 2c Side plate 3 Moving blade 4 Impeller 6, 16, 18, 20 Stator blade 6x, 17, 19 Second flow path 7 First flow path 8 Diffuser 9 Scroll casing 11 Heat receiving head 12 pump 15 liquid cooling system 16a leading edge 16a1 pressure surface side 16a2 negative pressure surface side 21 pipe 22 third flow path

Claims (4)

A main plate, a plurality of moving blades arranged and mounted on the main plate in a circular shape, and an impeller constituted by a side plate having a suction port and attached to a position facing the main plate of the moving blades A diffuser having a plurality of stationary blades arranged in a circle around the impeller and having a first flow path between which the air discharged from the impeller flows. And at least one second flow path through which the fluid A flows is formed inside the stationary blade, and the stationary blade has a flat cross-sectional shape substantially perpendicular to the rotating shaft of the impeller and an arc shape. A heat transfer device having a plurality of second flow paths that are curved in parallel and in which the fluid A flows . A main plate, a plurality of moving blades arranged and mounted on the main plate in a circular shape, and an impeller constituted by a side plate having a suction port and attached to a position facing the main plate of the moving blades A diffuser having a plurality of stationary blades arranged in a circle around the impeller and having a first flow path between which the air discharged from the impeller flows. And at least one second flow path through which the fluid A flows is formed inside the stationary blade , and the stationary blade has an airfoil shape in cross section substantially perpendicular to the rotation axis of the impeller. , heat-carrying device provided with a plurality of second flow channel in which the fluid a inside flows, the equivalent diameter of the second flow path, and wherein the larger the front edge side of the vanes of the wing type airfoil shape . A main plate, a plurality of moving blades arranged and mounted on the main plate in a circular shape, and an impeller constituted by a side plate having a suction port and attached to a position facing the main plate of the moving blades A diffuser having a plurality of stationary blades arranged in a circle around the impeller and having a first flow path between which the air discharged from the impeller flows. And at least one second flow path through which the fluid A flows is formed inside the stationary blade , and the stationary blade has an airfoil shape in cross section substantially perpendicular to the rotation axis of the impeller. A plurality of second flow paths through which the fluid A flows are provided, and a part of the plurality of second flow paths is at least the pressure surface side and the suction surface side of the leading edge side of the airfoil-shaped stator blade A heat transfer device arranged on either side. The liquid cooling system which has a heat receiving part, the transport apparatus of the fluid A, and the heat transfer device as described in any one of Claims 1-3.

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