JP3633567B2 - Heat sink for forced air cooling - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat sink for forced air cooling for forcibly exchanging heat between a heating element such as a power module including a semiconductor switching element and the air, and particularly dust from the air flowing through the air flow passage for heat exchange. The present invention relates to a heat sink for forced air cooling provided with a filter for removal.
[0002]
[Problems to be solved by the invention]
Conventionally, as an example of a forced air cooling heat sink, an aluminum comb-shaped heat sink is used to form a duct-shaped heat dissipation unit with its heat dissipating fins arranged inside, and a heat generating element to be cooled is transmitted onto the heat dissipating unit. There is provided a device that is mounted thermally and in which air for heat exchange from a blower is circulated in a heat dissipation unit. When such a forced air cooling heat sink is used in an environment where a clean environment is required (for example, in a semiconductor factory), a filter is installed to remove dust from the circulating air for heat exchange. In order to prevent dirty air from leaking from the heat exchange air flow path located in front of the filter, a sealing packing is provided between the filter and the end face of the comb heat sink. It is also necessary to provide it.
[0003]
As the packing as described above, it is common to use one made of a closed cell structure thermoplastic resin foam having excellent sealing properties. However, the packing made of such a material has a weak point that heat resistance is low, whereas the heat sink for forced air cooling has a high temperature of 70 ° C. or higher. For this reason, in the case of a structure in which the packing is brought into direct contact with the end surface of the heat sink, it is inevitable that the packing is thermally deformed to cause a decrease in sealing performance, and the sealing structure can be held for a long period of time. There was a background that became difficult.
[0004]
The present invention has been made in view of the above circumstances, and an object thereof is to effectively prevent a situation in which the packing for sealing the air flow passage for heat exchange is thermally deteriorated, and to maintain the sealing performance for a long period of time. An object of the present invention is to provide a heat sink for forced air cooling that has the effect of becoming possible.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, the guide member disposed on the air outlet side of the heat radiating unit is in contact with the end surface portion of the heat radiating unit, that is, the end surface portion in a form surrounding the heat exchange air flow passage. It has a configuration having a frame-shaped main body portion that constitutes a part of the air flow passage for heat exchange, and a flange portion that extends from the peripheral edge portion of the main body portion, and the flange portion of the guide member A packing for sealing the air flow passage for heat exchange is arranged between the peripheral edge of the filter. As a result, since the guide member is interposed between the packing and the heat radiating unit, the heat of the heat radiating unit is hardly transmitted to the packing. For this reason, it becomes possible to effectively prevent the packing from being thermally deteriorated, and the sealing performance can be maintained over a long period of time.
[0006]
According to the second aspect of the present invention, since the guide member only needs to be formed by bending a metal plate, the manufacturing cost can be reduced.
[0007]
According to the means of claim 3, the structure in which the plate member formed in a frame shape along the packing is interposed between the flange portion and the packing, in other words, the guide member and the plate between the packing and the heat radiating unit. Since both the members are interposed, the heat of the heat radiating unit is hardly transmitted to the packing.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a heat sink for forced air cooling for a motor control device for an industrial robot will be described with reference to the drawings.
1 and 2 show a longitudinal sectional view and an exploded perspective view of the main part. 1 and 2, a housing 1 (shown only in FIG. 1) is for housing a motor control device for an industrial robot, its heat sink for forced air cooling, and other control components. An opening 1a for discharging air (air after heat exchange) discharged from the duct-shaped heat radiation unit 2 constituting the forced air cooling heat sink is formed on one side wall.
[0009]
In the heat dissipating unit 2, two comb-shaped heat sinks 3 and 4 having the same shape formed by extrusion of aluminum are disposed so that the heat dissipating fin groups 3a and 4a face each other, and both are made of metal in this disposition state. By integrating with side plates 5 and 6 (for example, made of aluminum) (see FIG. 2), a rectangular box shape having both ends in the longitudinal direction opened is formed. Needless to say, the heat dissipating fin groups 3a and 4a extend in the longitudinal direction (air blowing direction) of the heat dissipating unit 2, so that the heat dissipating unit 2 has an internal air flow passage for heat exchange. It is designed to function as a blower duct. The side plates 5 and 6 are fixed to the plate-like base portions 3b and 4b of the comb heat sinks 3 and 4 by screws.
[0010]
As shown in FIG. 1, the heat dissipating unit 2 configured as described above includes, for example, a power module for a motor control device (a power switching element such as an IGBT or a large-capacity diode) on its upper surface. ), And a regenerative current resistance unit 8 (corresponding to the heating element) for the motor to be controlled is mounted on the lower surface. .
The heat dissipating unit 2 is arranged in the housing 1 so that one end face thereof faces the opening 1a. In this case, the heat dissipating unit 2 is arranged so that the one end surface is parallel to the side wall surface of the housing 1 where the opening 1a is formed and is located inward by a predetermined dimension Δd from the outer surface of the side wall surface. Is done. Moreover, although not shown in figure, the forced air-cooling air blower for ventilating in the arrow A direction (opening 1a direction) in the figure in the said heat radiating unit 2 is installed in the other end surface side of the heat radiating unit 2.
[0011]
A guide member 9 is attached to, for example, four screws 10 on the end surface of the heat radiating unit 2 on the opening 1a side. The guide member 9 is formed by punching and bending a metal plate (for example, a stainless steel plate), and is a shallow rectangular container-shaped main body having a depth dimension equal to the dimension Δd. 9a and four flange portions 9b bent outward from the four sides of the opening edge portion of the main body portion 9a. In the attached state, the main body portion 9a is inside the opening portion 1a. The portion corresponding to the bottom surface of the main body 9 a comes into contact with the end surface of the heat radiating unit 2, and the flange portion 9 b comes into contact with the peripheral edge of the opening 1 a in the housing 1 from the outer surface side.
[0012]
Further, in the portion corresponding to the bottom surface of the main body portion 9a of the guide member 9, the opening region of the end surface of the heat radiating unit 2 (rectangular region including the heat radiating fins 3a and 4a) with the guide member 9 attached to the heat radiating unit 2 A rectangular ventilation hole 9c is formed in a form facing the. Thereby, the main-body part 9a of the guide member 9 comes to comprise a part of air flow path for heat exchange. Furthermore, four screw insertion holes 9d (see FIG. 2) for attaching and fixing the guide member 9 to the heat radiating unit 2 with screws 10 are formed at the edge portion of the vent hole 9c in the main body 9a. The base portions 3a and 4b in the heat radiating unit 2 are formed with screw holes 10a (see FIG. 2) at portions corresponding to the screw insertion holes 9d. Each of the upper and lower flange portions 9b of the guide member 9 has two screw insertion holes 9e (see FIG. 2) for screws 13 for fixing the plate 11 and the filter cover 12 described later to the housing 1. Is formed.
[0013]
The plate 11 is obtained by processing a metal plate (for example, a stainless steel plate or a cold rolled steel plate) into a rectangular frame shape, and has two screw insertion holes 11a (see FIG. 2) for the screws 13 in the upper and lower frame portions. It is formed one by one.
The filter cover 12 is formed by punching and bending a metal plate (for example, a cold-rolled steel plate), and includes a rectangular container-shaped main body 12a for housing the filter 14, and the main body. It has a shape including two flange portions 12b bent outward from two upper and lower sides of the opening edge of the portion 12a. An opening 12c for ventilation is formed in a portion corresponding to the bottom surface of the main body 12a in the filter cover 12. Further, each of the flange portions 12b of the filter cover 12 is formed with two screw insertion holes 12d for the screws 13 for fixing the filter cover 12 to the housing 1 together with the plate 11.
[0014]
The filter 14 housed in the filter cover 12 has a well-known configuration in which a corrugated paper-like filter member 14b is disposed in a rectangular frame body 14a. The rectangular frame-shaped packings 15 and 16 are fixed to the flange portions 14c (see FIG. 1) formed on both sides of the metal plate by adhesion or the like. The packings 15 and 16 are made of, for example, a closed cell structure thermoplastic resin foam, which is an inexpensive material with good sealing properties.
[0015]
And the said filter 14 is mounted | worn so that the ventilation opening 9c of the said guide member 9 may be covered, and the filter 14 of the state to which packing 15 and 16 was fixed is accommodated in the filter cover 12 at the time of the mounting | wearing. At the same time, the plate 11 is disposed at a position in contact with the packing 16. In this state, the screw 13 inserted through the screw insertion hole 12 d of the filter cover 14, the screw insertion hole 11 a of the plate 11, and the screw insertion hole 9 e of the guide member 9. Is screwed into a screw hole 13a (see FIG. 1) formed on the housing 1 side. Thereby, it will be in an attachment state as shown in FIG. In this state, the air discharged from the heat radiating unit 2 is discharged to the outside through the ventilation holes 9 c formed in the main body 9 a of the guide member 9, the frame of the plate 11, the filter 14, and the opening 12 c of the filter cover 12. As a result, the exhaust air is cleaned. In this case, the airtightness is maintained at the mounting portion of the filter 14 by the packings 15 and 16.
[0016]
According to the forced air cooling heat sink according to the present embodiment having such a configuration, the filter 14 is provided in the passage of the air discharged from the heat radiating unit 2, so that a clean environment such as a semiconductor manufacturing factory is required. Can withstand use under certain conditions. In this case, the guide member 9 and the plate are disposed between the heat radiating unit 2 that is higher than the heat resistance temperature of the packings 15 and 16 and about 70 ° C., and the packing 16 that is susceptible to the heat from the heat radiating unit 2. 11 is interposed. For this reason, it becomes difficult for the heat from the heat radiation unit 2 to be transmitted to the packing 16, and thermal deterioration of the packing 16 can be effectively prevented. As a result, the sealing performance by the packings 15 and 16 can be maintained in a good state for a long time. Moreover, since the guide member 9 is formed by punching and bending a metal plate, the manufacturing cost can be reduced.
[0017]
The present invention is not limited to the above-described embodiments, and can be modified or expanded as described below.
The plate 11 may be provided as necessary. Of course, the materials of the guide member 9, the plate 11, the filter cover 12, the packings 15 and 16, etc. are not limited to those described in the above embodiment. Further, although the control circuit unit 7 and the regenerative current resistance unit 8 of the motor control device for the industrial robot are given as examples of the heating element, the invention is not limited to such an example.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of the present invention. FIG. 2 is an exploded perspective view of the essential part.
1 is a housing, 2 is a heat dissipation unit, 3 and 4 are comb heat sinks, 7 is a control unit (heating element), 8 is a regenerative current resistance unit (heating element), 9 is a guide member, 9a is a main body, and 9b is A flange part, 11 is a plate, 12 is a filter cover, 14 is a filter, and 15 and 16 are packings.

Claims (3)

Through the frame-shaped packing for sealing the heat exchange air flow passage to the air outlet side of the heat dissipation unit while circulating the air for heat exchange in the duct-shaped heat dissipation unit on which the heating element is mounted In the heat sink for forced air cooling comprising a filter,
On the air outlet side of the heat radiating unit, a frame-shaped main body part that forms a part of the air flow passage for heat exchange in contact with the end surface of the heat radiating unit, and a flange portion that extends from the peripheral edge of the main body part A guide member having
A heat sink for forced air cooling, wherein the packing is interposed between a flange portion of the guide member and a peripheral portion of the filter. The heat sink for forced air cooling according to claim 1, wherein the guide member is formed by bending a metal plate. The heat sink for forced air cooling according to claim 1 or 2, wherein a plate member formed in a frame shape along the packing is interposed between the flange portion and the packing.

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