JP4207291B2 - Heat sink device and cooling method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat sink device and a cooling method thereof .
[0002]
[Prior art]
Conventionally, a heat sink is attached to a heat generating member such as a CPU (central processing unit) package incorporated in an electronic device or a power transistor element incorporated in a power supply device, and the heat sink is subjected to forced air cooling. Like to do.
[0003]
[Problems to be solved by the invention]
However, in this conventional forced air cooling method, air is blown only from a specific direction to the heat sink to which the heat generating member is attached, so that forced air cooling is performed. A boundary layer is formed between the radiating fin portion and the cooling air that flows along the radiating fin portion that prevents heat from being absorbed from the radiating fin portion. There was a problem that the cooling effect of the was reduced.
[0004]
The present invention has been made in view of such points, and it is an object of the present invention to suppress the generation of this boundary layer that hinders the action of absorbing heat from the radiating fin portion, and to improve the cooling efficiency of the heat generating member by this heat sink. To do.
[0005]
[Means for Solving the Problems]
A heat sink device according to the present invention is a heat sink device comprising: a heat sink member that absorbs heat of a heat generating member mounted thereon; and a forced air cooling unit that radiates heat from the heat sink member by blowing cooling air to the heat sink member. The member has a plurality of radiating fin portions , and a gap between the cooling fins is provided between the adjacent radiating fin portions, and the forced air cooling means is a main forced air flow for cooling air along the plurality of spaces. The cooling means and a plurality of heat dissipating fin portions are extended to the vicinity of a notch portion where the other end side communicates between adjacent gaps, and the leading end portion of the ventilation duct has a leading end portion formed at the free end on the other end side. has a blower duct air blowing outlet is arranged provided in a state of facing to the notch, and, double the direction forming an direction substantially perpendicular to the plurality of heat radiating fins are continuous Is characterized by having from the secondary forced air cooling means for flowing cooling air from the blower outlet towards the Joint Gap.
[0006]
In the cooling method of the heat sink device according to the present invention, a gap is provided between the plurality of radiating fin portions provided on the heat sink member, and cooling air is supplied from the main forced cooling means along the plurality of gaps , and a plurality of radiating heat is provided. It is characterized in that the cooling air is made to flow toward a plurality of gaps by the sub-forced air cooling means from the direction intersecting the direction in which the fins are continuous .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to the accompanying drawings.
[0014]
FIG. 1 is a perspective view showing a configuration of a heat sink device according to the present invention in which a forced air cooling means is provided for a heat sink on which a heat generating member is mounted to cool the heat sink.
[0015]
Figure 1 shows a heat sink device, the heat sink device 1 is constituted by the heat sink member 2 and forced air cooling member 3. Incidentally, the 4 heating element is a heat generating member to be cooled by the heat sink device 1.
[0016]
The heat sink member 2 is a heat generating member mounting surface portion 2A formed of a material having good thermal conductivity such as aluminum metal, a plurality of heat radiating fin portions 2B,..., 2B, 2C,. 2C, support part 2D, and mounting substrate 2E.
[0017]
And between each of the plurality of radiating fin portions 2B,..., 2B and 2C,..., 2C, between the mounting surface portion 2A of the heat generating member and the radiating fin portions 2B, 2C, and 1F, which is a flow path for cooling air, is provided between the radiation fin portions 2B, 2C and the mounting substrate 2E, and a plurality of radiation fin portions 2B,. In the state where the notch 2G is provided between 2B and 2C,..., 2C, the plurality of radiating fin portions 2B,..., 2B, 2C,. The heat sink member 2 is configured by integrating the mounting surface portion 2A of the heat generating member and the mounting substrate 2E with the support portion 2D.
[0018]
In addition, these several radiation fin part is integrated in this way in the state arrange | positioned on both sides of this support part 2D, as shown in FIG.
[0019]
And the forced air cooling member 3 is comprised from the main air blower part 5 which is a main forced air cooling means, the air duct 6 and the sub air blower part 7 which are sub forced air cooling means .
[0020]
The main blower unit 5 includes a housing 5A, a fan for air blowing installed in the housing 5A, a motor for driving the fan, and mounting stays 5B and 5C provided in the housing 5A.
[0021]
When the fan is driven by the driving motor to be in a blowing state, the air is blown along the plurality of heat dissipating fin portions 2B, 2B, 2B, 2C, 2C. At the position where the cooling air based on this flows through the gaps 1F,. Yes.
[0022]
Reference numeral 6 denotes an air duct portion, and the air duct portion 6 includes an opening 6A, a sub-blower mounting plate 6B, a cooling air introduction chamber 6C, a tip portion 6D, a ventilation duct 6E, and an air blowing outlet 6F.
[0023]
The opening 6A is an opening for taking in cooling air blown from the sub-blower unit 7, the sub-blower mounting plate 6B is a sub-blower mounting plate in which the opening 6A is formed, and the cooling air introduction chamber 6C is this sub-blower. This is a hollow cubic cooling air introduction chamber for correcting a deviation in the flow of the cooling air provided on the side opposite to the sub-blower mounting side of the mounting plate 6B.
[0024]
The ventilation duct 6E has one end opened to the cooling air introduction chamber 6C, the other end is extended to the vicinity of the notch 2G, and the tip 6D is formed at the free end on the other end. Reference numeral 6F denotes an air outlet provided in the tip portion 6D in a state of facing the notch 2G.
[0025]
Further, in the state where the cooling air introduction chamber 6C and the ventilation duct 6E are disposed so as to have the positional relationship shown in FIG. 1 with respect to the heat sink member 2, the air duct portion 6 is attached to the heat sink member 2 and the heat sink member 2 is attached. And the air duct part 6 are integrated.
[0026]
The sub-blower unit 7 includes a housing 7A, mounting stays 7B and 7C, a fan for blowing installed at a predetermined position inside the housing 7A, and an electric motor for driving the fans. The stays 7B and 7C The casing 7A is mounted on the sub-blower mounting plate 6B with the cooling air blown out by the fan of the casing 7A aligned with the opening 6A. In this state, the housing 7A is fixed to the sub-blower mounting plate 6B by the mounting stays 7B and 7C.
[0027]
Next, the internal structure of the ventilation duct 6E is shown in FIG. 2, and the same parts as those in FIG.
[0028]
As shown in FIG. 2 by cutting the portion of the ventilation duct 6E in the direction indicated by the arrows A and A in FIG. 1, the ventilation duct 6E has a plurality of air conditioning guide plates 6G,. .., 6G are arranged along the flow of the cooling air, flow into the ventilation duct 6E from the cooling air introduction chamber 6C, and the flow of the cooling air blown out from the air blowing port 6F is one of the air blowing ports 6F. The flow of the cooling air is arranged so as not to be biased to the part.
[0029]
Next, the flow of cooling air in the heat sink cooling device 1 according to the present invention will be described with reference to FIGS.
[0030]
When a fan for blowing air installed inside the housing 5A provided on the main blower unit 5 side is driven by a motor for driving the fan, and the cooling air sucked by the fan is blown toward the heat sink member 2, Cooling air based on this airflow flows through the gaps 1F,..., 1F along the plurality of radiating fin portions 2B,..., 2B, 2C,. The fin is forced to cool.
[0031]
Then, the heat generated in the heat generating member 4 is transmitted to the heat sink member 2, and the clearance 1F,... Along the plurality of radiating fin portions 2B,..., 2B, 2C,. .., a cooling state in which this heat is absorbed by this cooling air flowing through 1F.
[0032]
Therefore, by driving a fan for blowing installed in the housing 5A with the electric motor for driving the fan and blowing cooling air toward the heat sink member 2, the heat generation of the heat generating member 4 can be generated. The cooling air that has been absorbed from the radiation fin portions 2C,..., 2C and the temperature has increased by the absorbed amount flows along the plurality of radiation fin portions 2B,. Therefore, the boundary layer can be generated on the side of the plurality of radiating fin portions 2B,..., 2B.
[0033]
However, in this example, in the state where these radiating fins are forcibly air-cooled in this way, the fan for blowing air installed in the housing 7A provided on the sub blower unit 7 side is used for driving the fan. It is driven by an electric motor, and the cooling air sucked by this fan is blown to the notch 2G from the blowing outlet 6F provided at the tip 6D of the ventilation duct 6E.
[0034]
As a result, the cooling air blown from the blower outlet 6F to the notch 2G generates between the plurality of heat dissipating fin portions 2B,..., 2B and the cooling air flowing along these gaps. This boundary layer can be suppressed, and the cooling efficiency of the plurality of radiating fin portions 2B,..., 2B can be increased.
[0035]
Further, the temperature of the cooling air flowing along the plurality of heat radiating fin portions 2B,..., 2B and the temperature of the heat sink member 2 are reduced by blowing this cooling air from the blower outlet 6F to the notch 2G. And the cooling efficiency of the radiation fin portions 2B,..., 2B can be further increased.
[0036]
Therefore, according to this example, it is possible to improve the cooling efficiency of the heat generating member by the heat sink.
[0037]
Further, according to an experiment by the present applicant, in the present example, when the amount of cooling air blown from the blower outlet 6F to the notch 2G is 1, the plurality of radiating fin portions 2B, ..., 2B, 2C, ..., 2C, when the airflow ratio of the cooling air blown to 2C is set to an airflow ratio of 5 to 10, the effect of suppressing this boundary layer is reduced. It turns out that it can be maximized.
[0038]
In order to set such an air volume ratio, the sub air blower unit 7 having an air blowing capacity such that the air blowing capacity of the sub air blowing unit 7 with respect to the air blowing capacity on the side of the main air blowing unit 5 becomes such a ratio is selected. .
[0039]
In the embodiment shown in FIG. 1, an example in which the air blowing outlet 6F is provided on one side of the heat sink member 2 has been described. However, in the present invention, the air blowing outlet 6F is provided on both sides of the heat sink member 2. In addition, notch portions 2G may be provided on both sides of the heat sink member 2, and cooling air may be blown to each of the notch portions 2G from the respective air blowing outlets 6F.
[0040]
In addition, the present invention is not limited to being applied to the purpose of forced cooling of the heat sink, and the present invention can also be applied to an electronic device in which a heat sink equipped with a CPU is forced to cool. The present invention can also be applied to a power supply device in which a heat sink equipped with a power element such as a power switching element is forcibly air-cooled, and further, a heat sink equipped with a power element is forcibly air-cooled. The present invention can also be applied to various devices.
[0041]
【The invention's effect】
According to the present invention, it is possible to reliably suppress the formation of a boundary layer that hinders the action of absorbing heat from the heat radiation fin portions between the heat radiation fin portions of the heat sink and the cooling air flowing along the heat sink fin portions. Therefore, the cooling efficiency of the heat generating member by this heat sink can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a heat sink device of the present invention.
FIG. 2 is a cross-sectional view showing an internal structure of a ventilation duct of a heat sink device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Heat sink apparatus , 2 ... Heat sink member, 2B , 2C ... Radiation fin part, 3 ... Forced air cooling member, 4 ... Heat generating member, 5 ... Main ventilation base (main forced cooling means) , 6 ... ··· Air duct section, 6F ··· Air blow outlet, 7 ··· Sub air blow base (sub forced cooling means)

Claims (5)

A heat sink member that absorbs the heat of the heat generating member mounted;
In a heat sink device comprising forced air cooling means for radiating heat from the heat sink member by blowing cooling air to the heat sink member,
The heat sink member has a plurality of heat dissipating fin portions , and provides a gap between adjacent heat dissipating fin portions where cooling air flows.
The forced air cooling means is
Main forced air cooling means for causing the cooling air to flow along the plurality of gaps ;
This notch is formed at the front end portion of the ventilation duct in which the other end side is extended to the vicinity of the notch portion communicating between the gaps adjacent to the plurality of heat dissipating fin portions and the tip end portion is formed at the free end on the other end side. A blower duct portion in which a blower blowout port provided in a state of facing is disposed, and the blowout blower is directed from the direction substantially perpendicular to the direction in which the plurality of radiating fin portions are continuous toward the plurality of gaps. A sub-forced air cooling means for flowing the cooling air from the mouth . 2. The heat sink device according to claim 1, wherein the air volume ratio between the air volume of the main forced air cooling means and the air volume of the sub forced air cooling means is 5 to 10: 1. A gap is provided between the plurality of heat radiation fin portions provided on the heat sink member ,
While flowing cooling air from the main forced cooling means along the plurality of play ,
A cooling method for a heat sink device, characterized in that cooling air is caused to flow toward the plurality of idle spaces by a sub-forced air cooling means from a direction intersecting a direction in which the plurality of radiating fin portions are continuous . The method of cooling a heat sink device according to claim 3 , wherein the air volume of the cooling air from the main forced cooling means is set to 5 to 10 times the air volume of the cooling air from the sub forced cooling means. In the radiating fin portion , a notch portion that communicates between the adjacent play is provided ,
4. The method of cooling a heat sink device according to claim 3, wherein the cooling air is blown from the auxiliary forced air cooling means to the notch .

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