JP5078872B2 - Heat sink with centrifugal fan - Google Patents

Description

  The present invention relates to a heat sink with a centrifugal fan including a plurality of radiating fins and a centrifugal fan, and more particularly to a compact heat sink with a centrifugal fan having a high ventilation rate and a high ventilation rate.

  There is a need for a high-performance heat sink with excellent heat dissipation efficiency due to an increase in heat generation amount and heat generation density of CPUs and elements. Furthermore, electronic devices such as personal computers and game machines are required to have a heat sink with a limited height, a compact size, low noise, and high heat dissipation efficiency. Conventionally, heat sinks made of extruded aluminum material, which are inexpensive to manufacture, have been used. The heat sink made of extruded material is easy to manufacture because the heat receiving block and the heat radiating fins are integrally formed. However, the pitch of the heat radiating fins is limited due to manufacturing restrictions, and the fins can be formed at a fine pitch. Technically difficult.

  Furthermore, it is difficult to cope with an increase in the amount of heat generated only by the combination of the heat receiving block and the heat radiating fins, and a heat sink combined with a heat pipe has been used. Among them, a heat sink of a type in which a plurality of thin plate-like heat radiation fins are inserted into a plurality of vertically arranged heat pipes having one end attached to a heat receiving block has been widely used. By using the heat pipe in this way, the heat radiation area and fin efficiency are improved, and heat radiation with a high calorific value is possible.

  A space serving as a flow path for the working fluid is provided inside the heat pipe, and heat is moved by the phase change or movement of the working fluid accommodated in the space such as evaporation and condensation. That is, on the heat absorption side of the heat pipe, the working fluid evaporates due to the heat generated by the parts to be cooled that are conducted through the material of the container constituting the heat pipe, and the vapor moves to the heat radiation side of the heat pipe. To do. On the heat radiating side, the working fluid vapor is cooled and returned to the liquid phase again. The working fluid that has returned to the liquid phase in this way moves (refluxs) again to the heat absorption side. Heat is transferred by such phase transformation and movement of the working fluid.

Normally, in the case of a forced-cooling heatsink that uses a heatsink that is connected to the heat-receiving block and has a number of heat-dissipating fins inserted into a plurality of heat pipes arranged vertically, a fan is attached to the side of the heat-dissipating fins. Attach and move the heat of the component to be cooled to the heat radiating fin by the heat pipe and forcibly cool it by the cooling fan.
Patent Document 1: Japanese Patent Laid-Open No. 11-351769 Patent Document 2: Japanese Patent Laid-Open No. 2001-210767

  However, in the conventional heat sink including the cooling fan described above, the area of the front surface of the fin is comparable to the area of the axial fan, and the height of the fan tends to be high. When such heat sinks are used in electronic devices where the height is limited, such as personal computers and game machines, instead of reducing the height of the heat dissipation fins, the heat sink becomes a horizontally long heat sink, In order to cool it, many small-diameter fans are arranged, and the number of fans to be combined increases. At the same time, there is a problem that the noise becomes high, the exhaust port of the electronic device becomes large, and the housing becomes large in combination with securing the installation place of various terminals.

  Furthermore, since a large number of heat generating elements are arranged in the housing as performance increases, it is necessary to more efficiently lower the temperature in the housing.

  Furthermore, the conventional arrangement of the heat transfer member that fixes the heat dissipating fin portion composed of a plurality of thin fins focuses only on the function of transferring heat to the heat dissipating fin portion, and the air flow that enters the heat dissipating fin portion from the centrifugal fan. There was a problem that the heat transfer member was disturbed and the flow was disturbed to hinder heat dissipation efficiency.

  Accordingly, the object of the present invention is to reduce the overall temperature of the housing even more effectively, even when used in electronic devices where the height is restricted, such as personal computers and game machines. An object of the present invention is to provide a heat sink with a centrifugal fan that is low in noise and compact and has high heat dissipation efficiency.

  The inventor has conducted research in order to solve the conventional problems described above. As a result, the shape of the radiating fin in which a plurality of sheets are laminated at a predetermined interval is made into a generally semicircular shape corresponding to the centrifugal fan, and the cover and the radiating fin are thermally connected to each other by the bottom portion having excellent thermal conductivity. In the space that is formed, in addition to the air flow through the radiating fins, an air flow that flows rapidly toward the outlet along the inner wall of the cover is generated, thereby significantly increasing the air ventilation in the housing. Thus, it has been found that the temperature in the housing can be more effectively lowered.

  That is, one side of the centrifugal fan is opposed to the semicircular air inflow portion of the radiating fins stacked at a predetermined interval, and the inner wall surface of the cover is directly opposed to the other side of the centrifugal fan. It arrange | positions in the space part mentioned above. As a result, on the side where the inner wall surface of the cover is directly opposed, an air flow is generated toward the outlet along the inner wall of the predetermined shape by the centrifugal fan. Further, the heat transfer member is blown from the air inflow portion of the radiating fin portion, flows through the radiating fin portion, and the air flow emitted from the curved portion does not hinder the flow of the air flow toward the air outlet along the inner wall of the cover. The heat dissipating efficiency is high.

The heat sink with a centrifugal fan of the present invention was made based on the above-described research results, and the first aspect of the heat sink with a centrifugal fan of the present invention is a predetermined shape having an air intake port and an air outlet port. The cover of
A heat receiving block that is thermally connected to a heating element that requires cooling;
A bottom portion having thermal conductivity, wherein the heat receiving block is thermally connected to one surface and engaged with the cover to form a space;
A heat dissipating fin portion comprising a plurality of fin portions which are thermally connected to the bottom portion and have a predetermined shape including at least an air inflow portion;
The rotating shaft is disposed in the vicinity of the air inflow portion of the radiating fin portion, takes in air from the air intake port, generates an air flow in a gap portion provided between adjacent fin portions of the radiating fin portion, and A centrifugal fan that creates an air flow along the inner wall of the cover toward the outlet;
A heat transfer member that is arranged so as to reduce the resistance of the air flow generated toward the side of the radiating fin portion by the centrifugal fan, and that conducts heat from the bottom portion through the plurality of fin portions; Is a heat sink with a centrifugal fan.

  According to a second aspect of the heat sink with a centrifugal fan of the present invention, the radiating fin portion includes a plurality of fin edge portions formed by a plurality of thin plate-like fins stacked at a predetermined interval, and the plurality of fins The edge portion includes at least a partial circumferential air inflow portion facing the centrifugal fan, a curved portion in communication with the air inflow portion and extending along the inner wall of the cover, and a blowing portion facing the blowing port. It is a heat sink with a centrifugal fan.

  According to a third aspect of the heat sink with a centrifugal fan of the present invention, the centrifugal fan is configured such that a part of the outer peripheral surface of the fan is opposed to the partial circumferential air inflow portion of the radiating fin portion, and the other portion is the It is a heat sink with a centrifugal fan, which is arranged relative to the inner wall of the cover, and generates the air flow along the inner wall of the cover toward the outlet from a predetermined position of the inner wall of the cover.

  According to a fourth aspect of the heat sink with a centrifugal fan of the present invention, the cover has a curved surface forming an inner wall of the cover at a position corresponding to a boundary portion between the air inflow portion and the curved portion of the radiating fin portion. It is a heat sink with a centrifugal fan which is provided with the conversion part and produces the said air flow along the inner wall of the said cover by the said conversion part.

  According to a fifth aspect of the heat sink with a centrifugal fan of the present invention, the heat dissipating fin portion further includes another fin edge portion that directly contacts the inner wall of the cover, and an end portion of the another fin edge portion is the It is a heat sink with a centrifugal fan that forms the starting point.

  A sixth aspect of the heat sink with a centrifugal fan according to the present invention is the same as the air outlet through which the air outlet passes through the radiating fin portion and the air outlet through which the air flows along the inner wall of the cover. It is a heat sink.

  A seventh aspect of the heat sink with a centrifugal fan according to the present invention is the heat sink with a centrifugal fan, wherein the heat transfer members are arranged radially from the centrifugal fan.

  According to an eighth aspect of the heat sink with a centrifugal fan of the present invention, the heat transfer member is blown from the air inflow portion of the radiating fin portion, flows through the radiating fin portion, and the air flow emitted from the curved portion is the It is a heat sink with a centrifugal fan arrange | positioned so that the flow of the airflow which goes to an air blowing outlet along the inner wall of a cover may not be inhibited.

  A ninth aspect of the heat sink with a centrifugal fan according to the present invention is a heat sink with a centrifugal fan, wherein the heat transfer member is a heat pipe.

  According to a tenth aspect of the heat sink with a centrifugal fan of the present invention, the air outlet is provided separately from an air outlet through which the heat radiating fin portion passes and an air outlet through which the air flows along the inner wall of the cover. It is a heat sink with a centrifugal fan.

  An eleventh aspect of the heat sink with a centrifugal fan according to the present invention is a heat sink with a centrifugal fan, wherein the heat receiving block is provided with at least one heat pipe.

  A twelfth aspect of the heat sink with a centrifugal fan of the present invention is a heat sink with a centrifugal fan in which the air outlet is provided toward the outside of the housing.

  Another aspect of the heat sink with a centrifugal fan according to the present invention is a heat sink with a centrifugal fan in which the blowout port is provided at one location.

  Another aspect of the heat sink with a centrifugal fan according to the present invention is a heat sink with a centrifugal fan in which the outlets are provided at a plurality of locations.

A centrifugal fan that sends out a swirling air flow from the side surface, a heat dissipating fin assembly that is disposed on a side surface of the centrifugal fan and that is cooled by the swirling air flow from the centrifugal fan, and is fixed to the heat dissipating fin assembly, A heat receiving block that conducts heat from the heating element that requires cooling to the radiation fin assembly, and a case member that supports these and forms a ventilation space;
The case member is
First and second plate members for forming the ventilation space across the radiation fin assembly;
A side member that covers a part of a side surface of the space sandwiched between the first and second plate members and forms a ventilation space together with the first and second plate members;
The radiation fin assembly is:
A plurality of heat dissipating fins stacked and spaced apart; and
A heat transfer member group that passes through the heat dissipating fins arranged in layers and transfers heat to the heat dissipating fins; and
The heat transfer member group includes a plurality of flat heat transfer members having a flat cross section, and the plurality of flat heat transfer members are distributed and arranged at a plurality of locations of the heat radiation fins.
In the distribution of the flat heat transfer member, the longitudinal direction of the flat cross-sectional shape passes through the flat cross-sectional shape with respect to the radius from the rotation center of the centrifugal fan. A heat sink with a centrifugal fan, characterized in that it includes all or a plurality of flat heat transfer members arranged in an inclined state with an acute angle in the same direction of rotation.

Further, as another aspect, a heat dissipating fin assembly for receiving an air flow swirled from a centrifugal fan from a side surface and performing cooling by the air flow,
A plurality of heat dissipating fins stacked and spaced apart; and
A heat transfer member group that passes through the heat dissipating fins arranged in layers and transfers heat to the heat dissipating fins; and
The heat transfer member group includes a plurality of heat transfer members having a flat cross-section, and the plurality of heat transfer members having a flat cross-section are arranged in a plurality of locations of the heat radiation fins,
The distribution of the heat transfer member having the flat cross-sectional shape is such that the longitudinal direction of the flat cross-sectional shape has the same rotation as the swirling of the air flow with respect to the radius from the rotation center of the centrifugal fan passing through the flat cross-sectional shape. There is provided a heat dissipating fin assembly including a plurality of components arranged in an inclined state with an acute angle.

  According to the heat sink with a centrifugal fan according to the present invention, one side of the centrifugal fan is disposed to face the semicircular air inflow portion of the plurality of thin plate fins arranged at predetermined intervals, and on the other side of the centrifugal fan. Is arranged in the space part with the inner wall surface of the cover facing directly, air flows through the plurality of laminated thin plate fins toward the outlet, and the inner wall surface of the cover faces directly Thus, an air flow is generated toward the outlet along the inner wall of the cover by the centrifugal fan. The effect is further enhanced when the above-described air flow is an accelerated flow.

  Therefore, on the other hand, the heat transmitted from the heat generating element to the heat receiving block moves to a plurality of thin plate fins arranged in layers at a predetermined interval, and is radiated outside the housing by the air flowing toward the outlet by the air of the centrifugal fan. The Further, since the air flow accelerated by the centrifugal fan toward the outlet is generated along the inner wall of the cover on the side where the inner wall surface of the cover is directly opposed, the air in the housing is taken in by the centrifugal fan and along the inner wall of the cover. Due to the air flow generated, the air is discharged from the outlet through the outlet. In this way, since it is discharged directly to the outside of the casing, preferably by an accelerated flow, the ventilation amount is increased, and an increase in the air temperature in the entire casing due to the heat generated by the heating element can be suppressed.

  Further, the heat transfer member is blown from the air inflow portion of the radiating fin portion, flows through the radiating fin portion, and the air flow emitted from the curved portion does not hinder the flow of the air flow toward the air outlet along the inner wall of the cover. The heat dissipating efficiency is high.

  Further, the heat transfer member group that passes through the heat dissipating fins arranged in layers and transmits heat to the heat dissipating fins includes a plurality of heat transfer members having a flat cross section, and has a plurality of flat cross section heat transfer members. The thermal member is distributed and arranged at a plurality of locations of the heat radiating fins. For this reason, heat is easily transmitted to the radiation fins evenly. In addition, the distribution of the heat transfer member having the flat cross-sectional shape is such that the longitudinal direction of the flat cross-sectional shape passes through the flat cross-sectional shape and has the same rotation as the rotation of the air flow with respect to the radius from the rotation center of the centrifugal fan. A plurality of persons arranged in an inclined state with an acute angle are included. Thereby, the area where the distributed heat transfer member collides with the flow of the swirling air flow from the centrifugal fan is reduced. For this reason, since the swirling air flow smoothly flows between the heat radiation fins as a whole, the cooling efficiency can be improved.

FIG. 1 is a perspective view showing a state of one aspect of a heat sink with a centrifugal fan of the present invention as viewed from the front side. FIG. 2 is a perspective view showing a state in which one embodiment of the heat sink with a centrifugal fan of the present invention shown in FIG. 1 is viewed from the back side. FIG. 3 is an exploded view illustrating the heat sink with a centrifugal fan according to the present invention. FIG. 3A shows the cover. FIG.3 (b) shows the bottom part excellent in thermal conductivity provided with the thin-plate fin laminated | stacked by predetermined spacing. FIG. 3C shows a centrifugal fan. FIG. 4 is a view for explaining the air flow of the heat sink with a centrifugal fan of the present invention. FIG. 5 is a view for explaining the air flow of the heat sink with a centrifugal fan of the present invention. FIG. 6 is a diagram illustrating the air flow of the heat sink with a centrifugal fan of the present invention. FIG. 7 is a perspective view showing another aspect of the heat sink with a centrifugal fan according to the present invention, in a partially cutaway state. FIG. 8 is a perspective view showing another embodiment of a heat sink with a centrifugal fan of the present invention. It is a cross-sectional view of FIG. FIG. 10 is a cross-sectional view schematically showing a connecting portion between the first plate member and the third plate member. FIG. 11 is a perspective view showing a state in which the radiation plate assembly is mounted and the first plate member and the third plate member are connected to each other. FIG. 12 is a perspective view showing a state before the first plate member on which the radiation fin assembly is mounted is connected to the third plate member. FIG. 13 is a perspective view showing a state before the third plate member and the first plate member on which the radiation fin assembly is mounted are connected. FIG. 14 is a perspective view showing a state in which the radiation plate assembly is mounted and the first plate member and the third plate member are connected to each other. FIG. 15 is a perspective view showing a state in which the heat dissipating fin assembly is mounted, the first plate member and the third plate member are connected, and the second plate member is placed. FIG. 16 is a cross-sectional view showing a part of a state in which a flat heat transfer member is inserted through the heat dissipating fin assembly. FIG. 17 is a perspective view showing a state in which a heat sink with a centrifugal fan according to the second embodiment of the present invention is attached to a substrate assembly. FIG. 18 is a perspective view showing a state before the heat sink with a centrifugal fan according to the second embodiment of the present invention is fixed to the substrate assembly. FIG. 19 is a cross-sectional view schematically showing a structure in which the IC chip and the heat receiving block are pressed against each other in the board assembly. FIG. 20 is an explanatory diagram showing a distribution state of heat transfer members in a heat sink with a centrifugal fan according to the second embodiment of the present invention. FIG. 21 is an explanatory view showing a mechanism for absorbing the difference in height between the radiating fin assemblies. DESCRIPTION OF SYMBOLS 1: Heat sink with centrifugal fan of this invention, 2: Cover, 3: Bottom, 3-1: Donut-shaped part, 3-2: Fin arrangement part, 4: Centrifugal fan, 4-1: Impeller, 4- 2: peripheral part, 5: heat radiating fin part, 6: heat receiving block, 7: heat pipe, 10: air intake port, 11: air outlet, 12: semicircular air inflow part of the heat radiating fin part, 13: Curved portion, 14: blowing portion, 15: another fin edge portion, 16: converting portion, 18, 19, 20, 22: air flow, 21: boundary portion, 23: heat transfer member, 100 ... centrifugal fan, 200 ... Radiation fin assembly, 210 ... radiation fin, 220 ... flat heat transfer member, 300 ... radiation fin assembly, 320 ... flat heat transfer member, 400, 500 heat receiving block, 600 ... case member, 610 ... first plate member, 620 ... Second plate, 6 DESCRIPTION OF SYMBOLS 0 ... 3rd board | plate material, 690 ... Connection mechanism, 100: Centrifugal fan, 200: Radiation fin assembly, 210: Radiation fin, 220: Flat heat transfer member, 300: Radiation fin assembly, 320: Flat heat transfer member, 400 , 500 heat receiving block, 600... Case member, 610: first plate member, 620: second plate member, 660: third plate member, 690: coupling mechanism. BEST MODE FOR CARRYING OUT THE INVENTION

  A heat sink with a centrifugal fan of the present invention will be described with reference to the drawings. First, a first embodiment will be described with reference to FIGS. Next, a second embodiment will be described with reference to FIGS.

  One aspect of the heat sink with a centrifugal fan according to the present invention includes a cover having a predetermined shape having an air intake port and a blowout port, a heat receiving block thermally connected to a heating element that requires cooling, and the heat receiving block is one of the heat receiving blocks. A predetermined shape comprising a bottom portion having thermal conductivity, which is thermally connected to a surface and engaged with the cover to form a space portion, and is thermally connected to the bottom portion and includes at least a circumferential air inflow portion. The heat dissipating fin portion is composed of a plurality of thin plate-like fins stacked and arranged at a predetermined interval and accommodated in the above-described space portion, and the air of the heat dissipating fin portion so that the rotation axis thereof is substantially perpendicular to the thin plate-like fin. It is arranged in the space part relative to the inflow part, takes air from above and / or below the radiating fin part, discharges part of the air toward the side of the radiating fin part, and along the inner wall of the cover The A centrifugal fan that generates an air flow toward the outlet, and an air flow that is generated by the centrifugal fan toward a side of the heat dissipating fin portion are arranged so as to reduce resistance, and the plurality of fin portions are inserted. And it is a heat sink with a centrifugal fan provided with the heat-transfer member which conducts the heat from the said bottom part.

  FIG. 1 is a perspective view showing a state of one aspect of a heat sink with a centrifugal fan of the present invention as viewed from the front side. FIG. 2 is a perspective view showing a state in which one embodiment of the heat sink with a centrifugal fan of the present invention shown in FIG. 1 is viewed from the back side.

  As shown in FIG. 1, a heat sink 1 with a centrifugal fan includes an air intake port to the centrifugal fan, a cover 2 having a predetermined shape including an air outlet through the heat sink, and a heat receiving block on one surface. And a bottom portion 3 having thermal conductivity which is engaged with the cover 2 to form a space portion. A centrifugal fan 4 is attached to the air intake. The thin fins 5 stacked at a predetermined interval arranged in the space can be seen at a part of the air outlet. Furthermore, a part of the heat transfer member 23 that passes through the plurality of thin plate-like fins and moves the heat of the heating element from the bottom to the plurality of thin plate-like fins is exposed on the surface of the cover 2.

  As shown in FIG. 2, a heat receiving block 6 that is thermally connected to a heating element that requires cooling is thermally connected to the back side of the bottom portion 3 having thermal conductivity. In the case where the heating element and the heat sink are separated, for example, the heat of the heating element is transferred to the heat receiving block 6 by the heat pipe 7. As shown in FIG. 2, the air intake port to the centrifugal fan may be provided so as to be also taken from the back surface of the heat sink. The heat pipe is a round heat pipe, but may be plate-shaped. The number of heat pipes is not limited to two.

  As shown in FIG. 1 and FIG. 2, a space where a plurality of thin plate fins stacked at a predetermined interval is not provided is provided at an air outlet through the heat sink. As will be described later in detail, the air flow accelerated by the centrifugal fan along the inner wall of the cover toward the outlet is directly discharged out of the housing through this space, for example.

  FIG. 3 is an exploded view illustrating the heat sink with a centrifugal fan according to the present invention. FIG. 3A shows the cover. FIG. 3 (b) shows a bottom portion having thermal conductivity with thin plate fins laminated at a predetermined interval. FIG. 3C shows a centrifugal fan.

  As shown in FIG. 3A, the cover 2 is made of, for example, resin, and the portions other than the air outlet 11 are covered with wall surfaces. A conversion unit 16 that changes the curved surface forming the wall surface of the cover is provided above the air intake port 10. On the surface of the cover 2, a hole is formed in which the head of the heat transfer member 23 disposed so as to reduce the resistance of the air flow generated toward the side of the heat dissipating fin portion by the centrifugal fan.

  As shown in FIG. 3B, the bottom portion 3 having thermal conductivity has a shape generally corresponding to the cover. That is, a doughnut-shaped portion 3-1 that accommodates a centrifugal fan disposed opposite to a semicircular air inflow portion of a plurality of thin plate fins stacked at a predetermined interval, and a thin plate stacked at a predetermined interval A portion 3-2 is provided in which the fins are arranged thermally connected. The bottom part 3 having thermal conductivity includes a conversion part 17 corresponding to the conversion part 16 in which the curved surface forming the wall surface of the cover 2 changes. Heat transfer members 23 that pass through the thin plate-like fins stacked at predetermined intervals and transfer heat from the bottom to the thin plate-like fins are arranged radially starting from the centrifugal fan. Furthermore, the heat transfer member 23 is blown from the air inflow portion of the radiating fin portion, flows through the radiating fin portion, and the air flow exiting from the curved portion 13 flows the air flow toward the air outlet along the inner wall of the cover. It is desirable to arrange so as not to inhibit. Further, the heat transfer member may be a heat pipe. Also in that case, it arrange | positions so that the air flow mentioned above may not be inhibited.

  As shown in FIG.3 (c), the centrifugal fan is provided with the peripheral part 4-2 attached to the air intake of a some fan (impeller) 4-1 and a cover. For example, the fan 4-1 is inserted into the space from the outside of the cover, is disposed in the above-described donut-shaped portion, and the protrusion provided on the peripheral edge 4-2 is fixed to the peripheral portion of the air intake port of the cover. The

  Further, as shown in FIG. 3B, the heat dissipating fin portion 5 includes a plurality of fin edges formed by a plurality of thin plate-like fins stacked at a predetermined interval. That is, the plurality of fin edges include at least a circumferential air inflow portion (for example, a semicircular shape) 12 facing the centrifugal fan, and a curved portion 13 that communicates with the air inflow portion and extends along the inner wall of the cover. And a blowing portion 14 facing the blowing port. Further, the plurality of thin plate-like fins stacked at a predetermined interval includes another fin edge 15 that contacts the inner wall surface of the cover.

  In addition to the plurality of thin plate-like fins stacked and arranged at a predetermined interval, the heat dissipating fin portion includes, for example, a plurality of pin fins arranged in parallel to the axial direction of the centrifugal fan, and the plurality of fin edges described above. You may arrange so that it may form. Further, curved plate-like fins may be arranged in a comb shape so that air flows from the air inflow portion toward the blowout portion. Anyway, the radiation fin part should just be a thing of the shape where air flows with a centrifugal fan toward an air blowing port from an air inflow part.

  The cover, bottom, and centrifugal fan shown in FIGS. 3 (a), 3 (b), and 3 (c) are assembled to form the heat sink with a centrifugal fan of the present invention as shown in FIGS. Is done.

  4 to 6 are views for explaining the air flow of the centrifugal fan-equipped heat sink according to the present invention.

As shown in FIG. 4, in the heat sink with a centrifugal fan of the present invention, the heat radiating fins are arranged only on one side of the centrifugal fan. This is because if the heat dissipating fin portion is arranged around the centrifugal fan so as to surround the centrifugal fan, the ventilation resistance is large and the air volume is reduced. As a result, the problem is that the atmospheric temperature in the casing rises due to a decrease in the ventilation amount in the casing, and all device temperatures rise.

  That is, in the heat sink with a centrifugal fan of the present invention, using the airflow that is allowed to pass through the heat dissipating fins and cooled by heat exchange with the heat dissipating fins, on the other hand, the heat dissipating fins in the space are removed, Ventilation is promoted by the accelerated flow generated along the inner wall surface of the cover. That is, the heat sink with a centrifugal fan of the present invention changes a part of the air taken in by the centrifugal fan from the air intake port of the cover into a fast flow along the inner wall surface of the cover and directly discharges it from the air outlet to the outside of the housing. The idea is to do.

  In this way, a part of the air taken in by the centrifugal fan from the air intake port of the cover is changed into a fast flow along the inner wall surface of the cover and directly discharged from the air outlet to the outside of the housing. The heating element located in the periphery can be cooled.

  FIG. 4 shows a direct discharge route, that is, a part of the air taken in by the centrifugal fan from the air intake port of the cover is changed to a fast flow along the inner wall surface of the cover and is discharged directly from the air outlet to the outside of the housing. It is a figure explaining the flow of air.

  As shown in FIG. 4, the side of the centrifugal fan that does not face the radiating fin portion faces the inner wall surface of the cover as described above. Another fin edge 15 of the radiating fin is in direct contact with the inner wall surface of the cover. Accordingly, a part of the air flow generated by the centrifugal fan flows along the inner wall surface of the semicircular surface shape of the cover, as indicated by an arrow 18, and in the conversion section 16 where the curved surface forming the wall surface of the cover changes, As shown by the arrow 19, it is further accelerated and becomes a large flow along the inner wall surface of the cover toward the air outlet. The air flow thus accelerated and becomes a large flow is directly discharged to the outside of the housing.

  The shape of the conversion portion 16 that changes the curved surface forming the wall surface of the cover shown in FIG. 4 is the shape of the boundary portion 21 of the curved portion that extends along the inner wall of the cover in communication with the semicircular air inflow portion of the radiating fin portion. In addition, it is desirable that the air flow generated by the centrifugal fan is hydrodynamically designed so that the air flow is accelerated along the inner wall of the cover to become a large flow.

  FIG. 5 is a diagram for explaining the air flow passing through the heat dissipating fin portion facing the centrifugal fan. The air flow taken from the air intake port and directed toward the semicircular air inflow portion of the radiating fin portion opposed by the centrifugal fan passes radially between the radiating fins as indicated by an arrow 22 and gently blows out the air. It flows while changing direction toward the mouth. In this flow, for example, the heat of the heating element is moved to the heat receiving block 6 by the heat pipe 7, and the heat transmitted to the heat radiating fin portion is moved toward the air blowing port by the air flow passing through the heat receiving fin portion, and out of the casing. It is a flow to discharge. A part of the heat transfer member 23 moves toward the curved part and a part of the heat transfer member 23 moves directly toward the air outlet so as not to obstruct the air flow passing through the above-described radiating fin part.

  FIG. 6 is a diagram for explaining the air flow in the heat sink with a centrifugal fan of the present invention. As shown in FIG. 6, the air flow that is accelerated along the inner wall of the cover and becomes a large flow as described with reference to FIG. 4 and is discharged directly from the air outlet to the outside of the housing, and the description with reference to FIG. 5. The heat of the heating element is moved to the heat receiving block 6, and the heat transmitted to the heat radiating fin portion is moved toward the air outlet by the air flow passing through the heat sink fin portion, and the two flows are discharged to the outside of the housing. Has occurred. Thereby, the heat of the heat generating element thermally connected to the heat receiving block and the heat of the heat generating element located in the periphery can be effectively discharged out of the casing. The air flow that accelerates along the inner wall of the cover described above to become a large flow and is directly discharged out of the housing from the air outlet, and the heat of the heating element are moved to the heat receiving block 6 and transmitted to the heat radiating fin portion by the heat transfer member. The heat transfer member is arranged so that no turbulent flow is generated between the two flows of the air flow passing through the generated heat.

  The heat receiving block 2 is made of a metal material having excellent thermal conductivity such as aluminum or copper, and the shape thereof can be appropriately selected according to the shape of the heating element such as a cylinder, a quadrangular column, or a polygonal column. it can. When connecting to a plurality of heat generating elements having different heights, unevenness may be formed on the heat receiving surface corresponding to the heat generating elements.

  As described above, in order to facilitate the connection between the heat receiving block and the heat pipe, a corresponding groove portion may be provided to increase the contact area between the heat pipe and increase the thermal conductivity. The heat pipe is not limited to this, but it is preferable to use a round heat pipe. Each of the heat transfer members has, for example, a cross-sectional shape that spreads from the centrifugal fan toward the curved portion 13 and the air blowing portion 14, and further desirably spreads as a whole.

  Next, another embodiment of the present invention will be described with reference to FIGS. In this embodiment, a plurality of, more specifically, heat receiving blocks 400 and 500 (see FIG. 7) for cooling an IC block on which two IC chips are mounted, and a corresponding heat dissipating fin assembly 200 and 300 (see FIG. 12 and FIG. 13) are examples of heat sinks with centrifugal fans that are cooled by a single centrifugal fan 100, respectively.

  In this embodiment, as shown in FIG. 18 and FIG. 19, for example, between the main frame 710 formed of a metal slope such as aluminum and the subframe 750 similarly configured, The heat sink 1 with a fan according to the present embodiment is fixed to a substrate assembly 700 that is configured with an electronic element and the like and a substrate 730 provided with a wiring (not shown). Fixing is performed by inserting fixing bolts 771 and 772 into through holes 761 and 762 provided in the leaf spring 760, and opening 751 in the subframe 750, through holes 731, 732 and 711 in the substrate 730 and the main frame 710. Each of 712 is inserted and screwed into the corresponding screw holes 411 and 412 of the heat receiving block 400 (the same applies to 500). As a result, the IC chip 720 is pressed into contact with the heat receiving block 400 through the opening 713 provided in the main frame 710.

  In addition, the heat receiving block 400 is fixed to the substrate assembly 700. A member 740 for distributing the force is disposed below the leaf spring 760. The member 740 for distributing the force receives the pressure of the leaf spring and distributes this force to the four sides of the plate so that the force is evenly applied to the IC chip. By doing in this way, it becomes possible to improve the adhesiveness of an IC chip and a heat receiving block. Here, FIG. 18 shows a disassembled state before being fixed. On the other hand, FIG. 17 shows a state where the heat sink 1 with a fan is fixed to the substrate assembly. In addition to the IC chip, for example, as shown in FIG. 17, a hard disk device 900 or the like is mounted on the board assembly, so that it is considered that the cooling can be dealt with. The air flow delivered from the heat sink 1 with the centrifugal fan is discharged from the openings 631 and 632 and the opening 641, respectively. For example, as shown in FIG. 18, the air flow from the radiating fin assembly 300 in which a part of the side surface can be seen is discharged to the opening 641.

  The heat sink 1 with a centrifugal fan includes a centrifugal fan 100 that sends a swirling air flow from the side surface, a heat dissipating fin assembly 200 that is disposed on the side surface of the centrifugal fan 100 and performs cooling by the swirling air flow from the centrifugal fan 100, and 300 and a heat receiving block 400 that is fixed to the heat dissipating fin assembly 200 and conducts heat from the heat generating element that requires cooling to the heat dissipating fin assembly 200, and is also fixed to the heat dissipating fin assembly 300 and cooled. A heat receiving block 500 that conducts heat from the heat generating element that requires heat to the radiating fin assembly 300, and a case member 600 (see FIG. 7) that supports these and forms a ventilation space.

  The centrifugal fan 100 sucks air in the axial direction and sends it out as an air flow swirling from the side. Specifically, a core 110 (see FIGS. 7, 8, 9, and 17) having a rotation drive unit, a plurality of blades 120, a ring 130 that fixes the blades 120, and a core 110 are provided. It has the attachment member 140 for attaching to the support member 620, the attachment nail | claw 145, and the core part support piece 150. FIG. Centrifugal fan 100 is fitted into a through-hole 611 provided in support member 620 and fixed by attachment member 140 and attachment claw 145. The mounting claws 145 are fixed by bolts (not shown) using, for example, fan fixing screw holes 621 shown in FIG.

  The case member 600 functions as a case having a space inside as a result of assembling a plurality of members. The following members are included as the plurality of members. 1st board | plate material 610 which has the opening 611 for making air flow in, and the 3rd board | plate material 660, and the 2nd board | plate material 620 which has the opening 622 for making air flow in. Moreover, it has the side member 650 which covers a part of side surface of the space pinched | interposed into the 1st board | plate material 610, the 3rd board | plate material 660, and the 2nd board | plate material 620. FIG. After being assembled, the side member 650 forms a ventilation space together with the first plate member 610, the third plate member 660, and the second plate member 620. The 1st board | plate material 610, the 3rd board | plate material 660, and the 2nd board | plate material 620 are comprised with a metal plate, for example. The reason for using a metal is that the thermal conductivity is large and the mechanical strength is large.

  In the heat sink of the present embodiment, one side of the case member 600 is covered by the first plate member 610 and the third plate member 660. The other side is covered with the second plate material 620. The centrifugal fan 100 is attached to the second plate member 620. As shown in FIGS. 8, 12, and 14, the first plate member 610 is provided to extend to an arcuate boundary 619 that protrudes outward and is located outside the turning radius of the rotary blade 120 of the centrifugal fan 100. ing. On the other hand, the third plate member 660 is processed into a shape that matches the planar shape of the boundary side 619 so as to contact the side surface of the first plate member at the boundary side 619. In other words, when the third plate member is brought into contact with the boundary of the first plate member 610, the shape is as if it were a single plate.

  Further, as shown in FIG. 14, on the first plate member 610, a space 601 surrounded by the radiating fin assembly 200 and the radiating fin assembly 300 can be said to be a region where a swirling air flow is caused by the centrifugal fan. .

  The first plate member 610 and the third plate member 660 are connected by a connecting mechanism 690 as shown in FIGS. 7, 8, 10, and 12, for example. That is, the first plate member and the third plate member are connected so as to be displaceable in the thickness direction of the plate member. In this embodiment, the coupling mechanism 690 includes a claw 691 provided integrally with the first plate member 610, a portion of the third plate member 660 provided with a through hole 696 that engages with the claw 691, and a through hole 311. And a portion of the heat dissipating fin 310 provided. The claw 691 includes an arm 693 and an engagement piece 692 extending from the tip of the arm 693 in the direction of the rotation axis of the centrifugal fan 100. The length of the engagement piece 692 and the height position of the arm 693 are the lengths necessary to absorb the displacement in the height direction that occurs in the first plate member 610 and the third plate member 660.

  Here, as shown in FIGS. 8 and 12, the through-hole 696 is formed in the vicinity of the edge portion that abuts the first plate member 610 boundary edge 619 of the third plate member 660. The length dimension and the width dimension of the through hole 696 are determined according to the allowable movement amount of the third plate member into the plane orthogonal to the rotation axis of the centrifugal fan.

  The coupling mechanism 690 can be displaced in the direction of the rotation axis. On the other hand, the coupling mechanism 690 restricts the first plate member 610 and the third plate member 660 from being separated from each other in a plane orthogonal to the rotation axis, and restricts the third plate member 330 from riding on the first plate member 310. doing.

  In the case of the present embodiment, for example, as shown in FIG. 8, the coupling mechanisms 690 are arranged at two positions with an inclination. More specifically, each is arranged in a direction along the radius from the rotation center O of the centrifugal fan. For this reason, the relative displacement in the same plane with respect to the 1st board | plate material 610 of the 3rd board | plate material 660 will be restrained small.

  The heat radiating fin assembly 200 and the heat receiving block 400 are fixed to the first plate member 610. Further, the side member 650 is connected to the first plate member 610. Further, the first plate member 610 is integrally provided with a side surface portion 615 that forms a side surface. For example, the side surface portion 615 faces the one side surface 212 of the radiating fin assembly 200 and forms a bypass 602 therebetween. Since the bypass 602 does not have the radiating fin assembly 200, the resistance is reduced, and the air flow can flow at a high speed. On the entrance side of the bypass 602, a guide portion 603 for guiding a swirling air flow in a tangential direction of swirling is provided. Since the guide portion 603 is covered with the side member 650 on the outside, there is no opening. Therefore, the swirling air flow proceeds along the inner wall of the side member 650 and flows into the bypass 602.

  In the case of this embodiment, the side member 650 is configured by a plurality of members. For example, a side member 651 that covers one side surface and side members 652 and 653 that cover a corner portion are used. Each of the side members 651 to 653 not only covers the side surface but also has a function of regulating displacement of the first plate member 610 and the third plate member 660 with respect to the rotation axis direction of the centrifugal fan. That is, the side members 651 to 653 are provided with claws 656 and 658, respectively, in contact with the first plate member 610 and the second member 620, respectively, and fix them to the side member. In the present embodiment, the side member 650 is formed by plastic molding. This is because a complicated shape can be easily formed.

  The case member 600 has a regulation mechanism that regulates the displacement stroke of the third plate member 660 in the thickness direction. Specifically, as shown in FIGS. 11 and 12, the side member 651 is provided with a rotation axis direction regulating piece 659 for regulating displacement of the centrifugal fan in the rotation axis direction. The rotation axis direction restricting piece 659 is constituted by a pair of restricting pieces 659a and 659b facing each other in the rotation axis direction. The restriction piece 695b is formed in a groove shape. The second plate is sandwiched and fixed in this groove. The third plate 660 and the radiating fin assembly 300 are sandwiched between the restricting pieces 659a and 659b. These can be displaced in the rotational axis direction (thickness direction of the plate pressure) as indicated by arrows in FIG. However, the displacement between the restricting pieces 659a and 659b is restricted within a certain stroke range. This displacement stroke is determined by assuming a deviation from a reference position in the height direction when an IC chip to be described later is mounted. In the present embodiment, for example, the range is shorter than the plate thickness of the third plate member.

  As shown in FIG. 13, a locking portion 669 is provided at the end of the third plate member 660. Of the locking portions 669, the locking portion 669 that contacts the side member 651 is locked to the restriction piece 659a at the above-described displacement stroke range limit. In addition, the other locking portion 669 is locked to the other side member 653 by a restriction piece (not shown) corresponding to the restriction piece 659a provided in the same manner at the displacement stroke range limit described above. Is done. As a result, the displacement of the third plate member 660 to which the radiating fin assembly 300 is fixed is restricted within the range of the fixed stroke by the restriction mechanism. However, the restriction by the restricting piece 659, that is, the play, is caused when the heat receiving blocks 400 and 500 that are in close contact with the two IC chips correspond to the reference positions of the respective IC chip surfaces. 500 is displaced relatively to absorb the deviation and maintain an appropriate crimped state.

  By the connection mechanism 690 described above, the first plate member 610 and the third plate member 660 can be connected with play in the height direction of the IC chip or the rotation axis direction of the centrifugal fan. For this reason, workability, such as fixing to a board | substrate, improves. Also, with such a configuration, a plurality of IC chips can be cooled by a heat sink provided with a single centrifugal fan.

  The heat dissipating fin assembly 200 includes a plurality of heat dissipating fins 211 that are stacked and spaced from each other, and a heat transfer member 220 that transfers heat to the heat dissipating fins 211 through the heat dissipating fins 211 that are stacked and disposed. A group. The heat transfer member 220 group includes a plurality of flat heat transfer members 220 having a flat cross section. The plurality of flat heat transfer members 220 are distributed and arranged at a plurality of locations of the radiation fins 211. In the present embodiment, the radiating fin assembly 300 is also used. Hereinafter, the flat heat transfer member 220 will be described, but since the configuration is common to the flat heat transfer member 320, the description will not be repeated.

  The flat heat transfer member 220 is formed of a metal such as aluminum, for example. The cross-sectional shape is formed to be a flat shape. The flat cross-sectional shape has a longitudinal direction that is longer than the other directions. The reason for the flat shape is that the air resistance can be reduced by arranging the longitudinal direction of the flat shape along the flow of the air flow. Examples of the flat cross-sectional shape include an oval shape, an elliptical shape, and a rectangular shape.

  The important point here is that the longitudinal direction of the flat shape follows the air flow. When the intersection with the air flow increases, the resistance increases. The problem is how to arrange them. One answer is to have a radial arrangement as already shown in FIGS. According to this, it can be expected to reduce the resistance of the air flow to some extent.

  In the second embodiment, this is further promoted and distributed as follows. That is, in the distribution of the flat heat transfer member 220, the longitudinal direction of the flat cross-section passes through the flat cross-sectional shape, and the radius of the centrifugal fan rotates with respect to the radius from the rotation center of the centrifugal fan. The flat heat transfer members arranged in an inclined state with an acute angle in the same rotation direction are included in a total number or a smaller number.

  FIG. 20 schematically shows a specific distribution of the heat transfer member used in the present embodiment. Assuming that the center of the swirling air flow formed by the centrifugal fan is at the rotation center o of the centrifugal fan, a radial line segment r passing through the center of an arbitrary flat heat transfer member is drawn from this rotation center. In addition, a line segment k in the longitudinal direction of the flat heat transfer member is drawn. When the angle θ formed by the intersection of the longitudinal line segment r and the radial line segment k is examined, all acute angles are observed in the same direction as the rotational direction of the swirl flow (indicated by an arrow in FIG. 20). I know what to do.

  In the case of the present embodiment, in both of the heat dissipating fin assemblies 200 and 300, all the heat transfer members satisfy the relationship described above. Of course, even if not all of them are satisfied, the effects of the present invention can be achieved. Therefore, even if some flat heat transfer members include those that do not satisfy the conditions for the sake of design, they can be ignored if the number is small.

  By the way, in the case of this embodiment, the flat heat insulation member 220 is flat heat-transferred to the through-hole 610a provided in the 1st board | plate material 610, and the through-hole 211a provided in each radiation fin 211, as shown in FIG. By sequentially press-fitting the members 220, a plurality of heat radiation fins 211 are stacked with a space therebetween. In order to press-fit into the through-holes, in each through-hole, for example, 610a, the inner peripheral portion of the through-hole 610a is drawn to form an annular band. As a result, the flat heat transfer member 220 is firmly fixed to the heat radiating fins 211. Moreover, since the contact area of the radiation fin 211 and the flat heat transfer member 220 increases, there is an advantage that the heat transfer efficiency is improved.

  In this embodiment, pins 250 for positioning and the like are used in addition to the flat heat transfer member. These pins also function as heat transfer members because a heat conduction effect can be expected. Therefore, in this embodiment, the heat transfer member having a circular cross section is substantially mixed.

  As shown in FIG. 7, the heat receiving block 400 includes a heat receiving unit 410 and a heat transfer unit 450 that transfers heat received by the heat receiving unit to the radiation fins. The heat receiving unit 410 is formed of a metal having good thermal conductivity such as copper, for example. The shape can be appropriately selected according to the shape of the heating element, such as a cylinder, a square column, or a polygonal column. In addition, for example, a heat pipe is used as the heat transfer unit 450. Of course, it is not limited to this. In the case of the heat receiving block 400, the heat receiving portion 410 is fixed to the first plate member 610. Further, the heat pipe of the heat transfer unit 450 is disposed so as to be in contact with the base end portion of each flat heat transfer member 220. Thereby, heat can be efficiently transmitted to the radiation fin.

  The heat receiving block 500 includes a heat receiving unit 510 and a heat transfer unit 550. The heat receiving block 500 is arranged so as to float so that the heat receiving portion 510 and the heat transfer portion 550 do not contact the first plate member 610. The heat transfer unit 550 is fixed to the third plate member 660. Therefore, the heat receiving block 500 can be displaced according to the displacement of the third plate member. In addition, the heat transfer part 550 is arrange | positioned so that the base end of the flat heat transfer member 320 may be contacted. By doing in this way, heat transfer performance can be improved.

  As described above, according to the second embodiment of the present invention, two chips can be cooled by a single heat sink with a centrifugal fan. Therefore, it is easy to reduce the size of the cooling portion that takes up the volume.

  In the second embodiment, two radiating fin assemblies are used, but it is of course possible to use a single radiating fin assembly. In that case, it can respond by covering the part in which the 3rd board | plate material 660 is placed with a side member. Of course, it is also possible to increase the area of the first plate member, increase the size of the heat dissipating fin assembly 200, and dispose it in that portion.

Further, since the present embodiment is provided with a bypass, an air flow with less resistance can be sent at a high speed, so that the efficiency of the centrifugal fan can be increased. As a result, it is possible to contribute to cooling of devices in other areas. For example, it becomes possible to increase the amount of air for the hard disk device shown in FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a cooling device for cooling an object that requires cooling, including an IC chip mounted on an electronic device such as a computer, a control device, and a game machine. Can do. It can apply to the cooling about the object which can be cooled using a radiating fin and a centrifugal fan.

Claims (16)

A cover with a predetermined shape including an air inlet and an air outlet;
A heat receiving block that is thermally connected to a heating element that requires cooling;
A bottom portion having thermal conductivity, wherein the heat receiving block is thermally connected to one surface and engaged with the cover to form a space;
A heat dissipating fin portion comprising a plurality of fin portions which are thermally connected to the bottom portion and have a predetermined shape including at least an air inflow portion;
The rotating shaft is disposed in the vicinity of the air inflow portion of the radiating fin portion, takes in air from the air intake port, generates an air flow in a gap portion provided between adjacent fin portions of the radiating fin portion, and A centrifugal fan that creates an air flow along the inner wall of the cover toward the outlet;
A heat transfer member that is arranged so as to reduce the resistance of the air flow generated toward the side of the radiating fin portion by the centrifugal fan, and that conducts heat from the bottom portion through the plurality of fin portions; , equipped with a,
The radiating fin portion includes a plurality of fin edges formed by a plurality of thin plate fins stacked at a predetermined interval, and the plurality of fin edges are at least the air inflow facing the centrifugal fan. A side portion extending along the inner wall of the cover, and a blowing portion facing the blowing port.
The centrifugal fan is arranged such that a part of the outer peripheral surface of the fan is opposed to the air inflow part of the radiating fin part and the other part is opposed to the inner wall of the cover, and a predetermined position of the inner wall of the cover is set. As a starting point, the air flow along the inner wall of the cover is generated toward the outlet,
The cover includes a curved conversion portion that forms an inner wall of the cover at a position corresponding to a boundary portion between the air inflow portion and the side surface portion of the heat radiating fin portion. A heat sink with a centrifugal fan for generating the air flow along the inner wall of the fan. The centrifugal fan according to claim 1 , wherein the radiating fin portion further includes another fin edge portion that directly contacts the inner wall of the cover, and an end portion of the another fin edge portion forms the starting point. heatsink. The heat sink with a centrifugal fan according to any one of claims 1 and 2 , wherein the air blowing port is common to an air blowing port through which the heat radiating fin portion passes and an air blowing port that flows along an inner wall of the cover. .   The heat sink with centrifugal fan according to claim 1, wherein the heat transfer members are arranged radially from a centrifugal fan as a starting point. The heat transfer member is blown from the air inflow portion of the heat radiating fin portion, flows through the heat radiating fin portion, and the air flow emitted from the side surface portion flows along the inner wall of the cover toward the air outlet. The heat sink with a centrifugal fan of Claim 4 arrange | positioned so that a flow may not be inhibited. The heat sink with a centrifugal fan according to claim 5 , wherein the heat transfer member is a heat pipe. 3. The air blowing port according to claim 1, wherein the air blowing port is provided separately from an air blowing port that passes through the radiation fin portion and an air blowing port that flows along the inner wall of the cover. Heat sink with centrifugal fan. The heat sink with a centrifugal fan according to any one of claims 1 to 7 , wherein the heat receiving block includes at least one heat pipe. The heat sink with a centrifugal fan according to any one of claims 1 to 8 , wherein the air outlet is provided toward the outside of the housing. A heat sink with a centrifugal fan,
A centrifugal fan that sends a swirling air flow from the side, a heat dissipating fin assembly that is disposed on the side of the centrifugal fan, and that is cooled by the swirling air flow from the centrifugal fan, and is fixed to the heat dissipating fin assembly, A heat receiving block that conducts heat from the heating element that requires cooling to the radiation fin assembly, and a case member that supports these and forms a ventilation space;
The case member is
First and second plate members for forming the ventilation space across the radiation fin assembly;
A side member that covers a part of a side surface of the space sandwiched between the first and second plate members and forms a ventilation space together with the first and second plate members;
The radiation fin assembly is:
A plurality of heat dissipating fins stacked and spaced apart; and
A heat transfer member group that passes through the heat dissipating fins arranged in layers and transfers heat to the heat dissipating fins; and
The heat transfer member group includes a plurality of flat heat transfer members having a flat cross section, and the plurality of flat heat transfer members are distributed and arranged at a plurality of locations of the heat radiation fins.
In the distribution of the flat heat transfer member, the longitudinal direction of the flat cross-sectional shape passes through the flat cross-sectional shape with respect to the radius from the rotation center of the centrifugal fan. the flat heat transfer member disposed in the direction of the same rotates while inclined at an acute angle, all or a plurality viewed contains less,
The heat sink with a centrifugal fan has two corresponding to the heat radiating fin assembly and the heat receiving block fixed to the heat radiating fin assembly,
In addition to the first plate member, the case member includes a third plate member that is connected to the first plate member so as to be displaceable in the thickness direction of the plate member, and includes one of the radiating fin assembly and the heat receiving block. A set is supported by the first plate member, and another set of the radiating fin assembly and the heat receiving block is supported by the third plate member,
The plurality of heat dissipating fin assemblies are disposed on a side surface of the centrifugal fan;
Heat sink with centrifugal fan, characterized in that. The heat sink with a centrifugal fan according to claim 10 ,
The heat sink with a centrifugal fan, wherein the case member has a regulating mechanism for regulating a displacement stroke in the thickness direction of the third plate member. In the heat sink with a centrifugal fan according to any one of claims 10 and 11 ,
The case member has at least one side surface having no opening and a plurality of side surfaces provided with a plurality of openings.
The plurality of heat dissipating fin assemblies are arranged such that a part of each peripheral portion faces a corresponding opening of the plurality of openings and the other part faces the side surface of the centrifugal fan. A heat sink with a centrifugal fan. In the heat sink with a centrifugal fan as described in any one of Claims 10-12 ,
The case member is formed by the side surface and the side surface of the radiating fin assembly adjacent to the side surface along the side surface where the opening portion is not provided. A heat sink with a centrifugal fan, characterized by having a bypass for guiding. In the heat sink with a centrifugal fan as described in any one of Claims 10-12 ,
The case member is formed by the side surface and a side surface of the radiating fin assembly adjacent to the side surface along one side surface where no opening is provided. Having a bypass leading to the section, and
The heat sink with a centrifugal fan, wherein the other side surface following the one side surface functions as a guide wall for guiding a part of the swirling flow from the centrifugal fan to the bypass. The heat sink with a centrifugal fan according to claim 10 ,
The heat receiving block includes a heat receiving portion that is thermally connected to a heating element that needs to be cooled, and a heat transfer portion that transfers heat of the heat receiving portion to the heat radiating fin assembly. heatsink. In the heat sink with a centrifugal fan as described in any one of Claims 10-12 ,
A heat sink with a centrifugal fan, wherein the flat heat transfer member has an oval cross section.

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