JP2022110640A - Heat dissipation structure - Google Patents

Abstract

To provide a heat dissipation structure capable of highly efficiently dissipating heat of a plurality of heat sources with different calorific values.SOLUTION: In a heat dissipation structure, a fan 35 is arranged at a location where a first space S1, which is connected to a suction port 10A of a housing 2 and which is provided with a first radiator 30 dissipating heat of a first heat source D1, and a second space S2, which is connected to an exhaust port 12A and which is provided with a second radiator 32 dissipating heat of a second heat source D2 with a larger calorific value than the first heat source D1, are connected, and the fan 35 flows air from the first space S1 into the second space S2. The second radiator 32 and a face of the housing 2 configure a duct 70 extending between the fan 35 and the exhaust port 12A, and the second space S2 is formed by the duct 70.SELECTED DRAWING: Figure 5

Description

The present invention relates to a heat dissipation structure.

Patent Document 1 is known as a technique related to cooling.
In the abstract of Patent Literature 1, in the "Problem" column, it is described that "a heat source holding device can be cooled more appropriately and efficiently." In the column of "solution", "a small calorific value heat source 3 with a small calorific value, a large calorific value heat source 4 with a large calorific value, and air passing through the small calorific value heat source 3 toward the large calorific value heat source 4. A ventilation passage 5 for supplying air and a fan device 6 for generating an airflow in the ventilation passage 5 are arranged in a predetermined device main body 2 . and a large-capacity fan device 6b provided on the upstream side of the large-calorific-value heat source 4 in the air passage.”.

JP 2009-86218 A

In Patent Document 1, it is necessary to provide two fans: a fan (small-capacity fan device 6a) that draws outside air into the device body 2 and a fan (large-capacity fan device 6b) that stirs the air inside the device body 2. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat dissipation structure that more efficiently dissipates heat from a plurality of heat sources that generate different amounts of heat.

One aspect of the present invention includes a housing provided with an intake port for taking in air and an exhaust port for discharging air, a fan, a first radiator for dissipating heat generated by a first heat source, and the first a second radiator that dissipates heat from a second heat source that generates more heat than the heat source, wherein the internal space of the housing is connected to the intake port, and the first space provided with the first radiator. and a second space connected to the exhaust port and provided with the second radiator, wherein the fan is disposed at a location where the first space and the second space are connected, and the first space to the second space, the second radiator and the surface of the housing constitute a duct extending between the fan and the exhaust port, and the second space is formed by the duct The heat dissipation structure is characterized by:

ADVANTAGE OF THE INVENTION According to this invention, heat can be efficiently radiated from a plurality of heat sources with different calorific values.

BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view which looked at the front side of the vehicle-mounted apparatus which concerns on embodiment of this invention. It is the perspective view which looked at the back side of the vehicle-mounted apparatus. It is the top view which looked at the bottom face of the housing|casing of an in-vehicle apparatus. It is a perspective view which shows the internal structure of a housing|casing. 1 is a conceptual diagram of a heat dissipation structure included in an in-vehicle device; FIG. 4 is a cross-sectional view taken along line AA of FIG. 3; FIG. 4 is a cross-sectional view taken along the line BB of FIG. 3; FIG. It is a perspective view which shows the structure of a 2nd radiator and a fan apparatus. It is the top view which looked at the bottom of the vehicle-mounted apparatus which concerns on 2nd Embodiment of this invention. It is the top view which looked at the back of an in-vehicle device. It is the figure which removed the upper surface of the housing|casing, and showed the internal structure of the vehicle-mounted apparatus. FIG. 12 is a sectional view taken along line CC of FIG. 11;

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
FIG. 1 is a front perspective view of an in-vehicle device 1 according to this embodiment. FIG. 2 is a perspective view of the in-vehicle device 1 as seen from the rear side.
An in-vehicle device 1 shown in these figures is a device called an IVI (In-Vehicle Infotainment) device, which is an example of an in-vehicle type device. As shown in FIG. 1, this in-vehicle device 1 includes a substantially box-shaped (that is, having six sides) housing 2 that constitutes the exterior of the device.
A vehicle in which the in-vehicle device 1 is installed has an instrument panel, which is a type of interior material, and a built-in bracket is provided on the instrument panel. The in-vehicle device 1 has the housing 2 attached to the built-in bracket with the front surface 2A directed toward the interior of the vehicle. In the in-vehicle device 1 of the present embodiment, the side surfaces 2B, 2B on both sides of the housing 2 are fixed to the built-in bracket by appropriate fixing members.
As shown in FIG. 2, the in-vehicle device 1 has a large number of connectors 6 of various types for connecting various wirings.

FIG. 3 is a plan view of the bottom surface 2D of the housing 2 of the in-vehicle device 1. FIG.
As shown in FIGS. 2 and 3, the housing 2 includes an air intake portion 10 that takes in air from the outside and an exhaust portion 12 that discharges air from the inside to the outside. An exhaust portion 12 is provided on the bottom surface 2D of the housing 2 . The intake section 10 and the exhaust section 12 are respectively composed of a large number of intake ports 10A and a large number of exhaust ports 12A provided on the bottom surface 2D. Further, the in-vehicle device 1 of the present embodiment is also provided with an exhaust port 12A on the rear surface 2C.

By providing the intake unit 10 (intake port 10A) and the exhaust unit 12 (exhaust port 12A) on the bottom surface 2D, compared to the configuration provided on the top surface 2E (FIG. 1) of the housing 2, water and dust can be prevented from It becomes difficult to enter the inside of the body 2.
In addition, since various members (for example, the connector 6, a fixing member to a built-in bracket, etc.) are arranged on the front surface 2A, the side surfaces 2B and 2B on both sides, and the rear surface 2C, the intake unit 10 and the exhaust unit The space and position allocated to 12 are limited. In particular, it is difficult to provide the intake section 10 and the exhaust section 12 on the side surface 2B because the fixing position to the mounting bracket differs depending on the type of vehicle. On the other hand, since the number of members arranged on the bottom surface 2D is smaller than that on the other surfaces, the intake port 10A and the exhaust port 12A can be positioned relatively freely so that the opening area of the intake port 10A and the exhaust port 12A can provide sufficient intake and exhaust volumes. It becomes easy to provide in

FIG. 4 is a perspective view showing the internal structure of the housing 2 of the in-vehicle device 1. As shown in FIG. FIG. 5 is a conceptual diagram of a heat dissipation structure 20 included in the in-vehicle device 1. As shown in FIG. It should be noted that FIG. 5 is drawn for the purpose of facilitating understanding of the configuration of the heat dissipation structure 20, and the dimensions and orientations of each member are different from those of other drawings.
As shown in FIG. 5, the in-vehicle device 1 includes a first heat radiator 30 for dissipating heat generated by a first heat source D1 and a first heat radiator 30 for dissipating heat generated by a first heat source D1 in an internal space S of the housing 2. and a second radiator 32 for dissipating heat from the heat source D2.
Each of the first heat source D1 and the second heat source D2 includes one or more heat generating components 40, and the amount of heat generated by the first heat source D1 and the second heat source D2 is the amount of heat generated by the heat generating components 40 included therein. Total amount. Heat-generating components 40 are typically electrical and electronic components.

The heat dissipation structure 20 is a structure that recovers heat from the first radiator 30 and the second radiator 32 using one fan 35, and efficiently radiates the first heat source D1 and the second heat source D2.
Specifically, as shown in FIG. 5 , the heat dissipation structure 20 includes a housing 2 provided with the above-described intake section 10 (intake port 10A) and exhaust section 12 (exhaust port 12A), a fan 35, and the above-described A first radiator 30 and a second radiator 32 are provided.
The housing 2 has a first space S1 connected to the intake section 10 and provided with the first radiator 30, and a second space connected to the exhaust section 12 and provided with the second radiator 32. S2 and.
The fan 35 is arranged at a location where the first space S1 and the second space S2 are connected in the internal space S of the housing 2, and is provided so as to send air from the first space S1 to the second space S2. .
By operating the fan 35 , an airflow E is generated in the internal space S of the housing 2 that passes through the intake section 10 , the first space S<b>1 , the fan 35 , the second space S<b>2 , and the exhaust section 12 in this order.
Then, the respective amounts of heat generated by the first heat source D1 and the second heat source D2 are collected by the airflow E from the first radiator 30 in the first space S1 and the second radiator 32 in the second space S2, respectively. Thus, heat is radiated from the first heat source D1 and the second heat source D2.

According to the heat dissipation structure 20, neither the suction surface nor the discharge surface of the fan 35 needs to directly face the outside. 2D, the upper surface 2E) can be arranged without being restricted to a position in contact with the upper surface 2E). Therefore, the arrangement position of the fan 35 can be appropriately set in the internal space S of the housing 2 according to the shapes and positions of the first space S1 and the second space S2. degree of freedom is increased.

In addition, since heat radiation from the first heat source D1 and the second heat source D2 is performed separately by the first radiator 30 and the second radiator 32, the heat-generating components 40 included in the first heat source D1 and the second heat source D2 It becomes easier to guarantee heat resistance.
Specifically, the IVI device, which is an example of the in-vehicle device 1, normally includes components with relatively low power consumption (hereinafter referred to as “low power consumption components”) and components with relatively high power consumption (hereinafter referred to as “high power consumption components”). (referred to as "power components"). The low power consumption component is, for example, a heat generating component 40 such as a CPU (Central Processing Unit) or a memory device, which generates a relatively small amount of heat and has a relatively low heat resistance temperature. High power consumption parts are, for example, parts that form an audio amplifier and the heat generating parts 40 that form a power supply, and are parts that have a relatively large output and heat generation and a relatively high heat resistance temperature.

In the heat dissipation structure 20 of this embodiment, the low power consumption components are included in the first heat source D1, and the high power consumption components are included in the second heat source D2. heat dissipation paths are thermally isolated. As a result, the low power consumption parts are less likely to be affected by the large amount of heat generated by the high power consumption parts, and the heat resistance of the low power consumption parts can be easily ensured.

In addition, in the heat dissipation structure 20, the first heat radiator 30 that dissipates the heat from the first heat source D1 having a relatively small amount of heat is positioned on the upstream side of the air flow E, so that the heat of the first heat source D1 is taken in from the intake section 10. recovered by the air immediately after the Since the temperature of this air is lower than that of the air on the downstream side of the airflow E, the first heat source D1 can be efficiently dissipated compared to the configuration in which the first radiator 30 is arranged on this downstream side.
Furthermore, the temperature of the air passing through the fan 35 can be kept lower than in the configuration in which the second radiator 32 that dissipates the heat from the second heat source D2 is arranged upstream of the airflow E, so the heat stress applied to the fan 35 is suppressed. and aging deterioration due to the heat stress is suppressed.

Next, the configuration of the heat dissipation structure 20 included in the in-vehicle device 1 of this embodiment will be described more specifically.
6 and 7 are cross-sectional views showing the internal structure of the in-vehicle device 1. FIG. 6 is a cross-sectional view taken along the line AA of FIG. 3, and FIG. 7 is a cross-sectional view taken along the line BB of FIG.
The first heat source D1 includes one or more of the heat generating components 40 (the low power consumption components described above) and a mounting board 42 on which the heat generating components 40 are mounted.
The first heat radiator 30 is arranged at a position sandwiching the heat-generating component 40 between the mounting substrate 42 and is thermally coupled to the heat-generating component 40, so that heat is transmitted from the heat-generating component 40, Heat is radiated to the first space S1.

The first radiator 30 of the present embodiment is a substantially plate-shaped member made of a highly thermally conductive material (for example, a metal material). One surface 30A of the first radiator 30 is thermally coupled to the heat-generating component 40, and the other surface 30B is arranged to face the intake section 10. As shown in FIG.
More specifically, as shown in FIG. 7, the first radiator 30 has a recessed portion 33 that is recessed from the other surface 30B toward the one surface 30A. is in contact with the heat-generating component 40, the heat-generating component 40 and the one surface 30A are thermally coupled.

As shown in FIGS. 6 and 7, the first space S1 is formed by a gap between the other surface 30B of the first radiator 30 and the bottom surface 2D provided with the intake portion 10 (intake port 10A). It is formed.
According to this configuration, the first radiator 30 of the first heat source D1 faces the air intake portion 10 (air intake port 10A) and is directly exposed to the air taken in from the outside. The amount of heat generated by the heat source D1 is efficiently recovered.

On the other hand, as shown in FIG. 6, the second heat source D2 includes one or a plurality of heat-generating components 40 (the above-described high power consumption components) and a mounting substrate 42 on which the heat-generating components 40 are mounted. In this embodiment, the heat-generating component 40 of the second heat source D2 is mounted on the mounting substrate 42 of the first heat source D1, but may be mounted on a mounting substrate different from that of the first heat source D1.
The second radiator 32 is arranged at a position sandwiching the heat-generating component 40 between it and the mounting substrate 42 of the second heat source D2, and is thermally coupled to the heat-generating component 40 so that the heat quantity from the heat-generating component 40 is dissipated. The amount of heat is transferred to the second space S2.

FIG. 8 is a perspective view showing the configuration of the second radiator 32 and the fan 35. As shown in FIG.
The second radiator 32 is a plate-shaped member made of a highly thermally conductive material (for example, a metal material) and having a fan 35 provided at one end 47A via a mounting member 60, which will be described later. As shown in FIG. 6, the second radiator 32 has one surface 32A thermally coupled to the heat-generating component 40 and the other surface 32B facing the exhaust section 12 (exhaust port 12A: FIG. 7). be.

In the heat dissipation structure 20 of the present embodiment, the second radiator 32 and the bottom surface 2D of the housing 2 form a duct 70 extending between the fan 35 and the exhaust section 12 (exhaust port 12A). , the duct 70 forms a second space S2.

Specifically, as shown in FIGS. 6, 7 and 8, the second radiator 32 has a pair of side walls 50, 50 extending from one end 47A to the other end 47B. 50, 50 are provided on the other surface 32B (the edge of the other surface 32B in the illustrated example). The pair of side walls 50 are formed at a height contacting the bottom surface 2D of the housing 2, and the pair of side walls 50 and the other surface 32B of the second radiator 32 and the bottom surface 2D of the housing 2 form a direct A tubular duct 70 is constructed.

According to this configuration, the airflow E generated by the fan 35 passes through the interior of the duct 70 (the second space S2) and flows from the one end 47A to the other end 47B of the second radiator 32, so that the second heat source D2 can be efficiently recovered from the second radiator 32, and the air discharged by the fan 35 (the air heat recovered in the first space S1) does not circulate to the internal space S of the housing 2.

Further, in the heat dissipation structure 20 of the present embodiment, the second radiator 32 is provided on the other surface 46 as shown in FIG. The fins 48 enhance heat recovery efficiency. Further, the fins 48 extend from the one end 47A to the other end 47B (from the fan 35 side to the exhaust port 12A side), are provided with a gap between them, and rectify the airflow E from the one end 47A to the other end 47B. It functions as a rectifying plate. As a result, unevenness in heat recovery can be suppressed in the range from the one end portion 47A to the other end portion 47B, and heat can be efficiently dissipated from the second heat source D2.

Furthermore, in the exhaust part 12 provided on the bottom surface 2D, as shown in FIG. It is smaller than the exhaust port 12A provided on the side. As a result, in the duct 70, the amount of air exhausted to the outside on the one end portion 47A side is suppressed, a sufficient flow rate is maintained on the other end portion 47B side, and the heat dissipation capacity on the other end portion 47B side is reduced. can be suppressed.

The attachment member 60 described above is a member for attaching the fan 35 to the one end portion 47A of the second radiator 32 . The mounting member 60 includes an air guide passage 61 that connects the duct 70 and the discharge side of the fan 35 , and the air discharged from the fan 35 is guided to the duct 70 through the air guide passage 61 .

In the heat dissipation structure 20 of the present embodiment, the second space S2 (internal space of the duct 70) is formed to have a smaller volume than the first space S1, and the airflow E flowing through the second space S2 flows into the first space S1. In comparison, it has a high pressure and a high flow velocity. As a result, even if the air is heat-recovered in the first space S1, a decrease in the heat recovery efficiency in the second space S2 due to the air is suppressed, and the second heat source D2, which generates a relatively large amount of heat, is sufficiently dissipated. be able to.

As described above, according to this embodiment, the following effects can be obtained.

In the heat dissipation structure 20 of this embodiment, the internal space S of the housing 2 is connected to the intake port 10A of the housing 2, the first space S1 provided with the first radiator 30, and the exhaust port 12A of the housing 2. and a second space S2 in which the second radiator 32 is provided, the fan 35 is arranged at a location where the first space S1 and the second space S2 are connected, and the first space S1 to the second space Air flow to S2.
Furthermore, the second radiator 32 and the bottom surface 2D of the housing 2 form a duct 70 extending between the fan 35 and the exhaust port 12A, and the duct 70 forms a second space S2.

According to this configuration, since the first radiator 30 that dissipates the heat from the first heat source D1, which generates a relatively small amount of heat, is positioned upstream of the airflow E generated by the operation of the fan 35, the first radiator 30 is positioned downstream. The first heat source D1 can be efficiently dissipated as compared with the arranged configuration.
Further, since the airflow E generated by the fan 35 flows through the interior of the duct 70 (the second space S2), the heat amount of the second heat source D2 can be efficiently recovered from the second radiator 32, and the fan 35 The discharged air (air heat-recovered in the first space S<b>1 ) does not circulate into the internal space S of the housing 2 .
Furthermore, since neither the suction surface nor the discharge surface of the fan 35 needs to directly face the outside, the fan 35 can be arranged without being limited to a position in contact with the exterior surface of the housing 2 .
In addition to this, since the heat radiation of the first heat source D1 and the second heat source D2 is divided between the first radiator 30 and the second radiator 32, the first heat source D1 and the second heat source D2 include It becomes easy to guarantee the heat resistance of the heat-generating component 40 .
In addition, the temperature of the air passing through the fan 35 can be kept lower than in the configuration in which the second radiator 32 that dissipates the heat from the second heat source D2 is arranged upstream of the airflow E, so the heat stress applied to the fan 35 is suppressed. and aging deterioration due to the heat stress is suppressed.

In the heat dissipation structure 20 of this embodiment, the first radiator 30 is arranged to face the intake port 10A.
As a result, the first heat radiator 30 is directly exposed to the air taken in from the outside, so that the amount of heat generated by the first heat source D1 can be efficiently recovered.

In the heat dissipation structure 20 of the present embodiment, the second radiator 32 is provided with a plurality of fins 48 protruding into the duct 70, so the heat recovery efficiency from the second radiator 32 can be enhanced.

In the heat dissipation structure 20 of the present embodiment, the opening area of the exhaust port 12A is smaller as it is closer to the fan 35, so a sufficient amount of air can flow to a position farther from the fan 35 in the duct 70.

In the heat dissipation structure 20 of this embodiment, the volume of the second space S2 is smaller than that of the first space S1.
As a result, the airflow E flowing through the second space S2 has a higher pressure and a higher flow velocity than those in the first space S1. A decrease in heat recovery efficiency can be suppressed, and the heat can be sufficiently dissipated from the second heat source D2, which generates a relatively large amount of heat.

[Second embodiment]
In the heat dissipation structure 20 of the first embodiment, the duct 70 is configured by the second radiator 32 and the bottom surface 2D of the housing 2. As shown in FIG. In this embodiment, a heat dissipation structure 120 in which the duct 70 is configured by the second radiator 32 and the upper surface 2E of the housing 2 will be described. In addition, in this embodiment, the same code|symbol is attached|subjected about the same member as 1st Embodiment, and the description is abbreviate|omitted.

FIG. 9 is a plan view of the bottom surface 2D of the in-vehicle device 100 according to this embodiment. FIG. 10 is a plan view of the back surface 2C of the in-vehicle device 100. FIG.
As shown in these figures, the in-vehicle device 100 has an air intake section 10 (air intake port 10A) provided on the bottom surface 2D of the housing 2, as in the first embodiment. On the other hand, the exhaust portion 12 (exhaust port 12A) is provided at a position closer to the upper surface 2E in the back surface 2C than the bottom surface 2D of the housing 2. As shown in FIG.

FIG. 11 is a diagram showing the internal structure of the in-vehicle device 100 with the upper surface 2E of the housing 2 removed. 12 is a cross-sectional view taken along line CC of FIG. 11. FIG.
As shown in FIGS. 11 and 12, in the heat dissipation structure 120 of the present embodiment, the heat-generating component 40 included in the second heat source D2 differs from the first embodiment in that the surface of the mounting board 42 facing the upper surface 2E is is implemented in The second heat radiator 132 is arranged to face the upper surface 2E, and contacts the heat-generating component 40 with a convex portion 136 protruding toward the bottom surface 2D.
Thus, the second radiator 132 and the upper surface 2E of the housing 2 form a duct 170 extending between the fan 35 and the exhaust port 12A, and the duct 170 forms a second space S2.

In the heat dissipation structure 120 of this embodiment, the duct 170 (second space S2) has a smaller cross-sectional diameter on the exhaust port 12A side than on the fan 35 side, as shown in FIG. As a result, in the duct 170 (second space S2), a decrease in flow velocity at a location far from the fan 35 can be suppressed, so a decrease in heat recovery efficiency at a location far from the fan 35 can be suppressed.

The first embodiment and the second embodiment described above merely show one aspect of the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention.

[Modification of First Embodiment]
In the heat dissipation structure 20 of the first embodiment, as in the second embodiment, even if the exhaust part 12 (exhaust port 12A) is provided only on the rear surface 2C and the cross-sectional diameter of the duct 70 is made smaller as the distance from the fan 35 increases, good.

[Modified Example of First Embodiment and Second Embodiment]
The air intake unit 10 may be appropriately provided not only on the bottom surface 2D of the housing 2 but also on other surfaces such as the side surface 2B.

The in-vehicle devices 1 and 100 are not limited to IVI devices. In other words, the in-vehicle devices 1 and 100 may be in-vehicle audio devices, in-vehicle audio-visual devices, in-vehicle navigation devices, or devices that combine the functions of both the navigation device and the audio device.

[Other Modifications]
Devices to which the heat dissipation structure of the present invention is applied are not limited to in-vehicle devices. That is, the heat dissipation structure of the present invention can be applied to any device having the first heat source D1 and the second heat source D2 inside the housing 2 .

In the above-described embodiments, descriptions related to directions such as horizontal and vertical, various numerical values, and shapes exclude peripherals in those directions, peripherals in those numerical values, and approximate shapes, unless otherwise specified. is not. That is, as long as the same effects as these directions, numerical values, and shapes are exhibited, the directions, numerical values, and shapes in the embodiments may be defined in the periphery of the directions, the periphery of the numerical values, and approximate shapes (so-called uniform ranges). )including.

Reference Signs List 1, 100 In-vehicle device 2 Case 2A Front surface 2B Side surface 2C Rear surface 2D Bottom surface 2E Top surface 10 Intake part 10A Intake port 12 Exhaust part 12A Exhaust port 20, 120 Heat dissipation structure 30 First radiator 32, 132 Second radiator 35 Fan 40 Heat-generating component 42 Mounting board 48 Fin 60 Mounting member 61 Air guide 70, 170 Duct D1 First heat source D2 Second heat source E Airflow S Internal space S1 First space S2 Second space

Claims (6)

A housing provided with an intake port for taking in air and an exhaust port for discharging air;
with a fan
a first radiator for dissipating heat generated by the first heat source;
a second radiator for dissipating heat from a second heat source having a larger heat value than the first heat source;
with
The internal space of the housing is
a first space connected to the intake port and provided with the first radiator;
a second space connected to the exhaust port and provided with the second radiator;
including
The fan is
arranged at a location where the first space and the second space are connected to flow air from the first space to the second space;
The second radiator and the surface of the housing constitute a duct extending between the fan and the exhaust port, and the duct defines the second space.
A heat dissipation structure characterized by: 2. The heat dissipation structure according to claim 1, wherein said first radiator faces said intake port. 3. The heat dissipation structure according to claim 1, wherein said second radiator comprises a plurality of fins projecting into said duct. 4. The heat dissipation structure according to any one of claims 1 to 3, wherein the opening area of the exhaust port is smaller as it is closer to the fan. The heat dissipation structure according to any one of claims 1 to 4, wherein the volume of said second space is smaller than said first space. The heat dissipation structure according to any one of claims 1 to 5, wherein the duct has a smaller cross-sectional diameter as it is farther from the fan.

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