JP2005235838A - Heat radiator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat radiator which can efficiently radiate heat received from heating elements while at the same time suppressing noise. <P>SOLUTION: An air duct 18 formed along the other side face 20b of a base 20 in a heatsink 16 is so structured that the air forcibly taken into the air duct 18 by driving of a fan 19 is caused to flow in one direction from an inlet port 18a toward an outlet port 18b. Due to this structure, even after the air is warmed by heat exchange with the heatsink 16 and then is exhausted as warm air via the outlet port 18b, it is prevented that the warm air goes around to the inlet port 18a side and is taken into the air duct 18 again via the inlet port 18a. Because of the existence of an inclined portion 17a, the air is surely guided between each projection 21 in the heatsink 16 and to the base 20 which is the hottest part in the heatsink 16. Therefore, more air is brought into contact with a surface of the heatsink 16 (base 20 and projections 21) which faces the air duct 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat dissipation device that dissipates heat received from a heating element.

  Conventionally, a heat radiating device as shown in FIGS. 8A and 8B is known as this type of heat radiating device. 8A includes a radiator 53 formed by projecting a plurality of radiating fins 52 from a flat heat receiving portion 51 joined to a heating element h, and the radiator 53. And a fan 54 for supplying air. Then, the fan 54 sends air from the free end direction of each radiating fin 52 toward the fixed end direction (that is, the heat receiving portion 51 direction), so that the air is almost from both sides of the heat receiving portion 51 in both directions. Heat that flows so as to branch at right angles and is received from the heating element h is radiated from the radiator 53. 8B, the heat receiving device 62 of the heat radiator 61 is covered with a cover 64 from the side on which the heat dissipating fins 63 are formed so that the heat receiving portion 62 of the heat radiator 61 is covered with the cover 64. An air passage 65 is surrounded by the heat radiating fins and the heat receiving portion 62. The fan 66 causes air to flow from one end side to the other end side of the air passage 65 along the direction in which the heat receiving portion 62 extends, so that the heat received from the heating element h is radiated from the radiator 61. It is like that.

  However, in the case of the first prior art (heat radiating device 50), since the air sent from the fan 54 in the direction of the heat receiving part 51 is changed in the flow direction by the heat receiving part 51 to a substantially perpendicular direction, noise (so-called aerodynamic noise) is generated. ) Occurred. In the case of the second prior art (heat radiating device 60), most of the air sucked into the air passage 65 based on the drive of the fan 66 flows in a region away from the heat receiving portion 62 where the heat is the highest in the radiator 61. For this reason, the heat radiating device 60 has a problem that heat cannot be radiated efficiently. In order to solve these problems, for example, a heat dissipation device described in Patent Document 1 has been proposed.

  Now, in the heat radiating device described in Patent Document 1, the heat radiator has a configuration in which a plurality of heat radiating fins (plate-shaped heat radiating fins) are formed so as to protrude in parallel from a flat plate heat receiving portion (substrate portion). Further, if each of the radiating fins is a single assembly (hereinafter referred to as a “radiating fin group”), the free end side edge of the radiating fin group is an air passage formed between the radiating fins. The fan is generally inclined so as to gradually increase toward the exhaust port, and the fan is disposed along the inclination of the free end side edge.

Then, when air is sucked into the air passage from the intake port formed in the free end side edge portion based on the rotational drive of the fan, the heat receiving portion is blown with air from an oblique direction, and the air and each heat release Heat is exchanged between the fins. Then, air warmed by this heat exchange (hereinafter referred to as “warm air”) flows to the exhaust port side and is exhausted from the exhaust port to the outside of the air passage. At this time, most of the air sucked into the air passage flows also in the vicinity of the heat receiving portion where the heat is highest among the heat sinks due to the heat received from the heat generating element, so that heat is radiated from the heat receiving portion to the air. Is also done efficiently. In addition, the air sucked into the air passage from the fan is not changed in the direction of the right angle on the way to the exhaust port, so that the generation of noise can be suppressed.
JP 2002-210772 A (Claim 3, FIG. 1)

  However, the heat dissipation device described in Patent Document 1 still has the following problems. That is, in the heat dissipation device in this case, the air (warm air) exhausted from the exhaust port of the air passage sometimes circulates to the vicinity of the fan (intake port). Therefore, the warm air is sucked into the air passage again based on the rotational drive of the fan, and as a result of heat exchange between the heat radiating fins and the heat receiving part in the radiator due to the warm air, noise suppression is suppressed in this heat radiating device. Even if it was possible, there was a problem that the heat radiation efficiency deteriorated.

  This invention is made | formed in view of such a situation, The objective is to provide the thermal radiation apparatus which can thermally radiate | emit the heat received from the heat generating body efficiently, aiming at suppression of noise.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that one side surface of the heat receiving portion is brought into contact with the heat generating body and at least one heat radiating fin projects from the other side surface of the heat receiving portion. And a cover that covers the heat radiator so as to surround and form an air passage between the heat receiving portion and the heat radiating fin, the air passage for sucking air into the air passage An intake port is formed on one end side in the direction along the other side surface of the heat receiving portion, and an exhaust port for exhausting air from the air passage is on the other end side in the direction along the other side surface of the heat receiving portion. Air that is formed and is guided in the air passage toward the other side of the heat receiving portion in the middle of flowing air forced into the air passage from the air inlet toward the air outlet. Need a guide It is set to.

  According to a second aspect of the present invention, in the heat dissipation device according to the first aspect, the air guide is located on the other side surface of the heat receiving unit among the inner surfaces of the cover in a positional relationship facing the other side surface of the heat receiving unit. The non-parallel facing portion is formed so as to face in a non-parallel state and gradually approach the other side of the heat receiving portion as it goes from the intake port side to the exhaust port side. The gist is that

  According to a third aspect of the present invention, in the heat radiating device according to the second aspect, a parallel facing portion facing the other side surface of the heat receiving portion in a parallel state is provided on the inner surface of the cover in the flow direction of the air. The gist is that it is formed so as to extend continuously downstream of the non-parallel facing portion.

  The heat received from the heating element can be efficiently radiated while suppressing noise.

Hereinafter, an embodiment in which the present invention is embodied in a heat dissipating device equipped in a cooling device using a Peltier element will be described with reference to FIGS.
As shown in FIGS. 1 and 3, the cooling device 10 of the present embodiment includes a heat transfer block 11 made of a metal (aluminum in the present embodiment) excellent in thermal conductivity, and a plurality (four in the present embodiment). The Peltier element (heat transfer element) 12 and the heat dissipation device H are provided. Each Peltier element 12 is screwed together with the heat transfer block 11 and the heat radiating device H while being sandwiched from both the left and right sides in FIG. 1 by a Peltier cushion 13 for positioning and fixing the Peltier element 12 so as not to move in the assembled state. 14 is tightened. In the present embodiment, the pipe 15 is formed in a meandering shape inside the heat transfer block 11, and water circulates and flows in the pipe 15 based on the driving of a pump (not shown). It is supposed to be.

  When a direct current is applied to the Peltier element 12, due to the Peltier effect, the right side surface in FIG. 1 becomes a heat absorbing surface 12 a that exhibits a cooling effect, and the left side surface in FIG. 1 becomes a heat radiating surface 12 b that exhibits a heating effect. It is configured as follows. The Peltier element 12 has the heat absorbing surface 12a bonded to the heat transfer block 11 and the heat radiating surface 12b bonded to the heat radiating device H. Therefore, in this embodiment, when a direct current is applied to the Peltier element 12, the water (cooling target) circulating and flowing in the pipe 15 is transferred by the cooling effect exerted by the heat absorbing surface 12a of the Peltier element 12. It is cooled via the block 11.

  As shown in FIG. 2, the heat dissipating device H includes a heat dissipator 16 and a cover 17 that covers the heat dissipator 16 from the left in FIG. 1, and between the cover 17 and the heat dissipator 16. An air passage 18 having an intake port 18a and an exhaust port 18b is formed. Further, at the lower end of the radiator 16 in FIG. 1, air is forcibly sucked into the air passage 18 from the air inlet 18a, and air in the air passage 18 is forcibly exhausted through the exhaust port 18b. An intake fan (hereinafter referred to as “fan”) 19 is provided.

  The radiator 16 has a rectangular flat plate-shaped base portion 20 that functions as a heat receiving portion, and one side surface 20 a of the base portion 20 is in contact (joined) with the heat radiating surface 12 b of the Peltier element 12. The radiator 16 functions as a heat radiating fin from the other side surface 20 b opposite to the one side surface 20 a of the base portion 20 (a surface that is a non-bonding surface with respect to the heat radiating surface 12 b of the Peltier element 12) 20 b. A row of ridges 21 is formed to project toward the left in FIG. That is, the radiator 16 receives heat from the Peltier element 12 via the base 20 joined to the heat radiation surface 12b of the Peltier element 12, and transfers the received heat to the protrusions 21. It is like that.

  And in the said heat radiator 16, it heat-exchanges with the air which flows through the inside of the said air path 18 through the surface site | part which faces in the said air path 18 of the said heat radiator 16 (base part 20 and each protrusion part 21). The heat received from the heat radiating surface 12b of the Peltier element 12 is radiated. Therefore, in this embodiment, the Peltier element 12 is a heating element that receives heat via the base (heat receiving part) 20 of the radiator 16. In addition, each protrusion 21 formed to protrude from the other side surface 20b of the base 20 has a flow direction of air flowing in the air passage 18 based on the driving of the fan 19 (from the bottom to the top in FIG. 1). And extending along the length direction of the base 20. For this reason, the flow direction of the air that is sucked into the air passage 18 from the intake port 18a and flows between the protrusions 21 is changed in the air passage 18 until it is exhausted from the exhaust port 18b. Never happen.

  The cover 17 is formed by bending a metal plate, and in a state of covering the radiator 16, a swash plate portion 17 </ b> A that is not parallel to the other side surface 20 b of the base portion 20, and the other side surface of the base portion 20. It has the flat plate part 17B which becomes parallel with 20b. The swash plate portion 17A is inclined so as to gradually approach the other side surface 20b side of the base portion 20 as it goes from the intake port 18a side to the exhaust port 18b side. Therefore, in the present embodiment, of the inner surface of the cover 17 that is in a positional relationship facing the other side surface 20b of the base portion 20, a slope portion (non-parallel facing portion) 17a that functions as an air guide by the inner surface of the swash plate portion 17A. Is configured. The flat plate portion 17B is formed so as to extend continuously downstream of the slope portion 17a in the air flow direction in the air passage 18, and the inner surface thereof is parallel to the other side surface 20b of the base portion 20. It is set as the plane part 17b which contact | abuts to the front end surface 21a of each said protrusion part 21 while facing in a state. Therefore, the air that is forcibly sucked into the air passage 18 from the intake port 18a based on the driving of the fan 19 is surely made by the inclined surface portion 17a on the way to the exhaust port 18b. And the other side 20b of the base 20 is guided.

  As shown in FIGS. 4A and 4B, the air passage 18 has an air flow direction from the intake port 18a toward the exhaust port 18b substantially along the other side surface 20b of the base 20. The passage structure is a straight line. Then, a cross-sectional area of the passage portion (enlarged passage portion) on the intake port 18a side formed by the swash plate portion 17A and a passage portion (narrow passage portion) on the exhaust port 18b side formed by the flat plate portion 17B. When the cross-sectional area is compared, the cross-sectional area of the passage portion (narrow passage portion) on the exhaust port 18b side is smaller. Therefore, the flow speed of the air flowing through the air passage 18 gradually increases from the intake port 18a side to the exhaust port 18b side, and the radiator 16 (base 20 and protrusion 21) in the middle of the flow. The air warmed by heat exchange with the air (hereinafter referred to as “warm air”) is quickly exhausted out of the air passage 18 through the exhaust port 18b.

  As for the relative positional relationship between the air inlet 18a and the air outlet 18b in the radiator 16, the air inlet 18a is formed on one end side in the direction along the other side surface 20b of the base 20. The exhaust port 18b is formed on the other end side in the direction along the other side surface 20b of the base 20. That is, the intake port 18a and the exhaust port 18b are arranged on one end side and the other end side of the air passage 18 in which the air flow direction is a substantially linear passage configuration (that is, the opening directions are opposite to each other). As provided). For this reason, the possibility that the warm air exhausted from the exhaust port 18b circulates toward the intake port 18a (fan 19) and is sucked into the air passage 18 again is extremely low.

  Next, the operation of the cooling device 10 and the heat dissipation device H of the present embodiment configured as described above will be described below. In the following description, it is assumed that warm water flows in the pipe line 15 by driving a pump (not shown), and the warm water is cooled by the cooling device 10 using the Peltier element 12.

  First, when a direct current is applied to the Peltier element 12, the temperature of the heat transfer block 11 decreases due to the cooling effect of the heat absorbing surface 12a. Then, the warm water flowing in the pipe line 15 is absorbed by heat exchange with the heat transfer block 11, and the temperature (water temperature) of the water decreases. On the other hand, on the heat radiating device H side, due to the heating effect of the heat radiating surface 12 b of the Peltier element 12, the temperature of the base 20 of the heat radiator 16 joined to the heat radiating surface 12 b rises. The overall temperature rises.

  Then, cold air (outside air) is forcibly taken into the air passage 18 based on the drive of the fan 19 and flows in the air passage 18 from the intake port 18a side to the exhaust port 18b side. At this time, a part of the air sucked from the intake port 18a is caused between the protrusions 21 of the radiator 16 and the base 20 by the inner surface (slope portion 17a) of the swash plate portion 17A of the cover 17. Guided to flow toward the other side 20b. Therefore, the air sucked into the air passage 18 is guided through the protrusions 21 to the base 20 that is the highest temperature in the radiator 16, and efficiently between the bases 20 and the protrusions 21. Heat exchange is performed.

  Thereafter, air (warm air) warmed by heat exchange between the base portion 20 and each protrusion 21 flows in the air passage 18 toward the exhaust port 18b, and the flat portion 17b of the cover 17 and each protrusion It reaches a passage portion (that is, a narrow passage portion on the exhaust port 18b side) surrounded by the portion 21 and the other side surface 20b of the base portion 20. Then, in this passage portion (narrow passage portion), the passage cross-sectional area is smaller than the passage portion (that is, the enlarged passage portion on the intake port 18a side) in which the inclined surface portion 17a surrounds and forms the air passage 18. The flow rate of air (warm air) is increased. As a result, the air (warm air) reaching this passage portion (narrow passage portion) is quickly exhausted out of the air passage 18 through the exhaust port 18b (see FIGS. 4A and 4B). Therefore, in the cooling device 10, since the heat dissipation device H efficiently dissipates heat received from the heat dissipation surface 12b of the Peltier element 12, the Peltier effect of the Peltier element 12 can be exhibited well, and as a result, The temperature of water can be efficiently cooled through the heat transfer block 11.

Therefore, in this embodiment, the following effects can be obtained.
(1) The air passage 18 formed along the other side surface 20b of the base 20 in the radiator 16 has an air inlet 18a formed on one end side in the direction along the other side 20b of the base 20, while A mouth 18b is formed on the other end side. Therefore, even when the air that is forcibly drawn into the air passage 18 based on the drive of the fan 19 is warmed by heat exchange with the radiator 16 and then exhausted as warm air from the exhaust port 18b, the warm air is It is possible to prevent the air from entering the air passage 18 from the air intake 18a again by going around the air intake 18a. Moreover, the air passage 18 has a passage configuration in which the flow direction of the air from the intake port 18a to the exhaust port 18b is substantially linear, and in the air passage 18, the air flows in one direction from the intake port 18a to the exhaust port 18b. It will flow. For this reason, the flow direction of air in the air passage 18 is not changed to a substantially right angle direction, so that the generation of noise (aerodynamic noise) based on the change in the flow direction can be suppressed satisfactorily.

  The air sucked into the air passage 18 based on the drive of the fan 19 is surely transferred between the protrusions 21 in the radiator 16 by the inclined surface portion (air guide) 17a, and further most in the radiator 16. It is guided to the base 20 side which becomes high temperature. Therefore, more air comes into contact with the surface portion of the radiator 16 (base 20 and protrusion 21) facing the air passage 18. Therefore, the heat dissipation device H can efficiently dissipate heat received from the Peltier element (heating element) 12 while suppressing noise. In the cooling device 10, the heat dissipation efficiency of the radiator 16 (heat dissipation device H) is improved, so that the Peltier effect of the Peltier element (heating element) 12 can be maintained well, and the water flowing in the pipe line 15 is efficiently used. Cools well.

  (2) The swash plate portion 17A in which an air guide that guides the air that is forcibly sucked into the air passage 18 in the heat radiating device H to the base 20 side that is the highest temperature in the radiator 16 is bent in the cover 17. It is comprised by the slope part 17a (non-parallel facing part) which is an inner surface. Therefore, an air guide that contributes to improvement in heat dissipation efficiency can be easily formed without increasing the number of members constituting the heat dissipation device H.

  (3) Further, on the inner surface of the cover 17, there is a flat surface portion 17 b that faces in parallel with the other side surface 20 b of the base portion 20 in the air flow direction along the other side surface 20 b of the base portion (heat receiving portion) 20. It is formed so as to continuously extend to the downstream side of the slope portion 17a. Therefore, the cross-sectional area of the air passage 18 has a flat plate portion 17B (planar portion 17b) as compared with the passage portion (enlarged passage portion) on the intake port 18a side surrounded by the swash plate portion 17A (slope portion 17a). The passage portion (narrow passage portion) on the exhaust port 18b side formed by encircling is smaller. Accordingly, the air sucked into the air passage 18 based on the drive of the fan 19 has a faster flow velocity after being heated by heat exchange with the radiator 16 and is smoothly exhausted from the air passage 18. In addition, the air in the air passage 18 can be quickly replaced, and the heat dissipation efficiency of the heat dissipation device H (heatsink 16) can be further improved.

  (4) Each protrusion (radiation fin) 21 protruding from the base 20 of the radiator 16 has a plurality of rows along the air flow direction in the air passage 18 in which the air flow direction is substantially linear. Is formed. Therefore, the air forcibly sucked into the air passage 18 flows in one direction along the surface of each ridge portion 21 from the air inlet 18a toward the air outlet 18b in the air passage 18, and the flow The flow direction is not changed along the way. Therefore, the heat dissipation efficiency can be improved satisfactorily while suppressing noise (aerodynamic noise) generated by changing the flow direction of the air flowing in the air passage 18.

  (5) Since the flat surface portion (parallel facing surface portion) 17b that is the inner surface of the flat plate portion 17B of the cover 17 is in contact with the tip end surface 21a of each protrusion portion 21 that protrudes from the base portion 20 of the radiator 16. The air guided to the base portion 20 side by the slope portion 17a which is the inner surface of the swash plate portion 17A always flows between the ridge portions 21. Therefore, the air sucked into the air passage 18 based on the drive of the fan 19 can be used efficiently for heat radiation by flowing along the surface of each protrusion 21 with certainty.

The present embodiment may be changed to another embodiment (another example) as follows.
In the embodiment, as shown in FIG. 5, the casing C of the cooling device 10 is provided outside the cover 17 of the heat radiating device H, and the circuit board 22 for controlling the Peltier element 12 is arranged inside the casing C. You may set up. Even if a notch portion 23 is formed in the swash plate portion 17A of the cover 17 as an air supply portion for supplying a part of the air sucked into the air passage 18 from the fan 19 to the circuit board 22 side. Good. With this configuration, the circuit board 22 that generates heat by the drive control of the Peltier element 12 can be simultaneously cooled by using a part of the air sucked from the intake port 18a, thereby reducing the load on the circuit board 22. And failure of the cooling device 10 based on the heat generation of the circuit board 22 can be favorably avoided. Further, if the guide member 24 is provided in the casing C so that the air from the air supply part (the notch part 23) is reliably supplied to the circuit board 22 side, the circuit board 22 is cooled more efficiently. The

  In the embodiment, the flat surface portion 17 b that is the inner surface of the flat plate portion 17 </ b> B of the cover 17 may not be in contact with the front end surface 21 a of each protrusion 21. That is, the flat surface portion 17 b may be slightly separated from the tip end surface 21 a of each protrusion 21.

  -In the said embodiment, if the radiation fin comprised by the protrusion part 21 protrudes in the air path 18 from the base 20 of the heat radiator 16, the radiation fin which makes arbitrary shapes (for example, pin shape etc.). It may be.

  In the embodiment, the cover 17 may not be provided with the flat plate portion 17B (plane portion 17b). For example, as shown in FIG. 6, the entire portion of the cover 17 that faces the other side surface 20b of the base portion 20 of the radiator 16 is composed of a swash plate portion 17A that has an oblique shape, and the inclined surface portion 17a that is the inner surface of the swash plate portion 17A. You may comprise so that it may face to the air path 18 from the exhaust port 18b. Even in such a configuration, the air sucked into the air passage 18 from the intake port 18a flows in the air passage 18 toward the exhaust port 18b, and the air is discharged by the radiator 16 by the inclined portion 17a. The base 20 is guided to the other side surface 20b side.

  -In the said embodiment, the non-parallel facing part (air guide) comprised by the slope part 17a faces the other side surface 20b of the base (heat receiving part) 20 in a non-parallel state, and is the exhaust port 18b from the inlet 18a side. What is necessary is just to be formed so that it may approach the other side 20b of the base 20 gradually as it goes to the side. Therefore, for example, an arbitrary surface shape such as an arc surface portion that is an inner surface of an arc portion obtained by bending the cover 17 into an arc shape or a curved surface portion that is an inner surface of a curved portion that is bent may be used.

In the embodiment, the cover 17 formed by bending from a metal plate material may be a cover formed from other materials such as synthetic resin.
In the above embodiment, as shown in FIG. 7, instead of configuring the air guide with the inner surface (slope portion 17a) of the swash plate portion 17A of the cover 17, a swash plate 25 is separately arranged in the cover 17, In the swash plate 25, the air guide may be constituted by an inclined surface 25a that faces the other side surface 20b of the base 20 of the radiator 16 in a non-parallel state. Even if comprised in this way, since the said air can be reliably guided to the said base 20 side, the thermal radiation efficiency by the thermal radiation apparatus H (radiator 16) can be improved.

  In the embodiment, the fan for forcibly sucking air into the air passage 18 is provided with an exhaust fan on the exhaust port 18b side instead of the intake fan 19 on the intake port 18a side. May be.

  In the embodiment, in the cooling device 10, without providing the heat transfer block 11, the heat absorption surface 12 a of the Peltier element 12 is brought into direct contact with the pipeline 15 to cool the water flowing through the pipeline 15. You may do it.

In the above-described embodiment, the radiator 16 may be a radiator in which an arbitrary number (for example, one) of radiating fins (the protruding portion 21) is formed to protrude from the other side surface 20b of the base portion 20.
-In the said embodiment, the heat generating body comprised by the Peltier device 12 may be other thermoelectric elements other than a Peltier device, or other heat generating bodies, such as a motor, and the thermal radiation apparatus H is from these heat generating bodies. You may actualize to the thing which thermally radiates the received heat.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) The radiating fins are protrusions formed in a plurality of rows so as to extend along the air flow direction in an air passage in which the air flow direction is substantially linear. The heat radiating device according to any one of the above.

(B) The heat radiation device according to claim 3, wherein the parallel facing portion of the cover is in contact with a front end surface of the heat radiation fin.
(C) The heat absorption surface of the thermoelectric element having the heat absorption surface and the heat dissipation surface is allowed to face the object to be cooled, and the heat dissipation surface is any one of claims 1 to 3 and the technical ideas i and b. The cooling device which joined the heat receiving part of the heat radiator with which the thermal radiation apparatus of description is equipped.

The top view of the cooling device which has a heat radiator of this embodiment. The plane sectional view of a cooling device similarly. The disassembled perspective view of a cooling device. (A) is the sectional view on the AA line of FIG. 1, (b) is the sectional view on the BB line of FIG. The top view of the cooling device of another example. The top view of the cooling device of another example. The schematic sectional drawing which shows a part of further another example of the cooling device. (A) is principal part sectional drawing of the heat radiator of 1st prior art, (b) is principal part sectional drawing of the heat radiator of 2nd prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Cooling device, 12 ... Peltier element (heat transfer element, heating element), 12a ... Endothermic surface, 12b ... Radiation surface (heating element), 16 ... Radiator, 17 ... Cover, 17A ... Swash plate part, 17a ... Slope Part (air guide, non-parallel facing part), 17B ... flat plate part, 17b ... flat part (parallel facing part), 18 ... air passage, 18a ... intake port, 18b ... exhaust port, 19 ... intake fan (fan), DESCRIPTION OF SYMBOLS 20 ... Base part (heat receiving part), 20a ... One side surface, 20b ... Other side surface (non-joining surface), 21 ... Projection part (radiation fin), 21a ... Tip surface, 22 ... Circuit board, 23 ... Notch part (air supply) Part), 25 ... swash plate, 25a ... slope (air guide), H ... heat dissipation device.

Claims (3)

A radiator in which one side surface of the heat receiving part is brought into contact with the heating element and at least one radiating fin is formed to protrude from the other side surface of the heat receiving part, and the radiator is disposed between the heat receiving part and the radiating fin. A cover that covers the air passage so as to surround the air passage;
The air passage is formed with an inlet for taking air into the air passage on one end side in a direction along the other side surface of the heat receiving portion, and exhaust for exhausting air from the air passage. The mouth is formed on the other end side in the direction along the other side surface of the heat receiving part,
An air guide is provided in the air passage for guiding air forcedly sucked from the air inlet into the air passage toward the other side of the heat receiving portion in the middle of flowing toward the air outlet. Heat dissipation device. The air guide faces in a non-parallel state to the other side surface of the heat receiving part among the inner surface of the cover that is in a positional relationship facing the other side surface of the heat receiving part, and the exhaust guide from the intake port side. The heat radiating device according to claim 1, comprising a non-parallel facing portion formed so as to gradually approach the other side of the heat receiving portion as it goes toward the mouth side. A parallel facing portion facing the other side surface of the heat receiving portion in a parallel state is formed on the inner surface of the cover so as to continuously extend downstream of the non-parallel facing portion in the air flow direction. The heat radiating device according to claim 2.

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