JP2009147242A - Air-cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that resistance against an external environment is not obtained since there is a possibility that a motor for driving fans has trouble by exposing an electronic component such as the motor to the external environment under a situation where resistance against the external environment such as waterproofness has to be considered, concerning an air-cooling device with a sealed case body, where the fans are respectively arranged at an inner side and an outer side so as to perform air-cooling by the forcible convection flow of the air inside the case body and the air outside the case body. <P>SOLUTION: The air-cooling device includes: the case body with a hole for penetrating a rotary axis where one end is projected toward the inner side of an attachment surface and the other end is projected toward the outer side of the attachment surface; the inner fan attached to one end of the rotary axis; the outer fan attached to the other end of the rotary axis; and the motor arranged inside the case body so as to rotate the inner fan. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air cooling device for a heat generating component mounted in a hermetically sealed casing.

  Normally, when a heat-generating electronic component (hereinafter referred to as a heat-generating component) such as a power supply component or a high-power amplifier is mounted inside a sealed housing that does not allow external air to flow inside, As a result, the electronic circuit may not operate normally. Therefore, it is necessary to dissipate the heat generated from the heat generating component to the outside.

  As an example of a conventional heat dissipation method, there is shown a method in which a fan is provided on each of the inside and outside of a hermetically sealed casing to force convection between air inside the casing and air outside the casing. In this method, heat generated from an electronic component mounted on the printed circuit board is conducted to a heat sink provided at the rear edge of the printed circuit board.

  The fan provided inside the hermetic casing blows air to the heat sink and raises the air to the rear wall surface of the casing to dissipate heat generated by the heat sink. A fan provided outside the sealed casing dissipates heat from the sealed casing by blowing air onto the rear wall of the casing (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 6-112678 (pages 2 and 3, FIG. 1)

  However, when a fan and a motor are provided outside the housing in a situation where resistance to the external environment such as water resistance must be taken into account, the motor breaks down by exposing electronic components such as the motor that drives the fan to the external environment. There is a problem that the tolerance of the external environment cannot be obtained.

  The present invention has been made to solve such a problem, and without having an electronic component such as a motor outside the sealed casing, by rotating a fan provided inside and outside the casing, it can be resistant to the external environment. The purpose is to obtain high heat dissipation capability while improving.

The air cooling device according to the present invention is:
A housing having a hole penetrating a rotating shaft having one end protruding inside the mounting surface and the other end protruding outside the mounting surface;
An inner fan attached to one end of the rotating shaft;
An outer fan attached to the other end of the rotating shaft;
A motor provided inside the housing and for rotating the inner fan;
It is provided with.

  According to the present invention, since the inner fan and the outer fan are connected by the rotation shaft in the shaft and the inner fan is driven by the motor, the outer fan can be rotated together with the inner fan. This eliminates the need to install electronic components such as motors that require resistance to the external environment, such as performance. Thereby, high heat dissipation capability can be obtained, improving the tolerance with respect to an external environment.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a sealed housing provided with an air cooling mechanism A. FIG. 2 is an enlarged view of the air cooling mechanism A shown in FIG. FIG. 3 is a diagram illustrating an example of an assembling method of the air cooling mechanism A. FIG. 4 is a diagram showing an inner heat-absorbing fin and an outer heat-dissipating fin that are attached to the sealed casing. FIG. 5 is a view showing that a cover is attached to the outer fan of the air cooling mechanism A. FIG.

In FIG. 1, the sealed casing 11 includes a heat generating component 12 mounted inside, an inner heat absorbing fin 13 provided on the inner wall of the sealed casing 11, and an outer heat radiating fin 14 provided on the outer wall of the sealed casing 11. And an air cooling mechanism A.

  As shown in FIG. 2, the air cooling mechanism A includes an inner fan 21 and a motor 22 that drives and rotates the inner fan 21 inside the sealed casing 11, and an outer fan 23 outside the sealed casing 11. . In addition, the air cooling mechanism A includes a shaft 24 having a rotating shaft 24 a that connects one end to the inner fan 21 and the other end to the outer fan 23. The sealed casing 11 has a hole through which the shaft 24 penetrates on the mounting surface. The shaft 24 penetrates the mounting surface of the hermetic casing 11 as shown in the figure, and one end of the rotating shaft protrudes inside the mounting surface, and the other end protrudes outside the mounting surface. Here, the material of the shaft 24 may be stainless steel or the like.

  As shown in FIG. 2, the motor 22 includes, for example, a bearing 22a attached around the rotary shaft 24a, a bearing support member 22b that supports the bearing 22a, a magnet (stator) 22c, and a coil attached to the rotary shaft 24a. The rotating shaft 24a is rotated by electromagnetically interacting the magnet 22c and the coil 22d. The method of rotating the rotating shaft 24a by electromagnetically interacting the magnet 22c and the coil 22d is a commonly used method, and will not be described.

  An example of an assembly method for the air cooling mechanism A shown in FIGS. 1 and 2 will be described with reference to FIG.

  (Procedure 1) The shaft 24 is passed through the sealed casing 11. At that time, a groove is provided in the sealed casing 11 so that the bearing 31 and the oil seal 32 can be attached around the shaft 24. For example, as shown in FIG. 3, the radius of the groove for the oil seal 32 is made larger than the radius of the groove for the bearing 31 around the axis of the shaft 24.

  (Procedure 2) After passing the shaft 24 through the sealed casing 11, the bearing 31 and the oil seal 32 are attached to the groove of the sealed casing 11 in this order, and the cover 33 is attached on the oil seal 32, so that the shaft 24 is hermetically fixed to the hermetically sealed casing 11.

  (Procedure 3) The inner fan 21, the outer fan 23, and the motor 22 are attached to the attached shaft 24 (rotating shaft 24a) so as to maintain airtightness.

  By assembling the air-cooling mechanism A as described above and attaching the air-cooling mechanism A to the sealed casing 11, the hermeticity of the sealed casing 11 is maintained.

  Next, the operation of the first embodiment using the above configuration will be described with reference to FIGS. The motor 22 is driven and the inner fan 21 is rotated. Then, the internal gas (such as air) of the sealed casing 11 is sucked from the intake side of the inner fan 21 along the mounting surface, and the internal gas of the sealed casing 11 is exhausted from the exhaust side of the inner fan 21 inside the casing. . In this way, forced convection 15 of the internal gas is generated as shown in FIG.

  Since the outer fan 23 is connected to the inner fan 21 and the motor 22 by a rotating shaft 24 a inside the shaft 24, the outer fan 23 is also rotated via the rotating shaft 24 a in the shaft 24 by driving the motor 22. To do. Then, the external gas (such as air) of the sealed casing 11 is sucked from the intake side of the outer fan 23 and the external gas of the sealed casing 11 is exhausted from the exhaust side of the outer fan 23 along the mounting surface. In this way, forced convection 16 of the external gas is generated as shown in FIG.

  When the heat generating component 12 mounted inside the sealed casing 11 is generating heat, the heat conduction 17 from the heat generating component to the internal gas and the heat from the internal gas to the sealed casing are caused by the forced convection 15 of the internal gas. Through the conduction 18, the heat of the heat generating component 12 can be conducted to the inner wall of the sealed casing 11, for example, the inner wall of the mounting surface of the shaft 24.

  For example, heat conducted to the inner wall of the mounting surface of the shaft 24 is transmitted to the outer wall of the mounting surface of the shaft 24. As shown in the figure, forced convection 16 of external gas is generated by the outer fan 23. Therefore, the heat transmitted to the outer wall of the mounting surface of the shaft 24 can be radiated to the outside by the heat conduction 19 from the sealed casing to the external gas.

  As shown in FIG. 1, the inner heat absorbing fin 13 is attached in the vicinity of the intake side of the inner fan 21, and the outer heat radiating fin 14 is attached in the vicinity of the exhaust fan of the outer fan 23, so that the heat generated from the heat generating component 12 is absorbed into the inner heat absorption. Since the heat can be conducted to the fins 13 and the outer heat radiation fins 14, it is possible to further enhance the heat radiation capability.

  That is, the rotation of the inner fan 21 generates a forced convection 15 of the internal gas inside the sealed casing 11, and transfers the heat in the sealed casing 11 to the inner heat absorbing fins 13 arranged on the inner side of the mounting surface. Further, the rotation of the outer fan 23 causes forced convection 16 of the external gas to the outside of the hermetic casing 11, and the external gas passes through the outer heat dissipating fins 14 arranged on the outer side of the mounting surface. To cool the sealed housing.

  FIG. 4 is an example of the inner heat-absorbing fins 13 and the outer heat-dissipating fins 14 that are attached to the sealed casing 11. The fin shown in FIG. 4 may use aluminum or an aluminum alloy, like the sealed casing 11. Therefore, when the sealed casing 11 is manufactured, the inner heat absorbing fins 13 or the outer heat radiating fins 14 may be integrally formed with the sealed casing 11.

  Although not shown in FIG. 1, it is possible to further increase the heat dissipation capability by attaching a heat sink to the heat generating component 12 mounted inside the sealed casing 11.

  Since heat radiation to the outside of the sealed casing 11 is heat transfer through the sealed casing 11, a material with good heat dissipation efficiency, such as aluminum or aluminum alloy, is used for the sealed casing 11. An aluminum plate or the like is used as the heat sink.

  As described above, the inner fan 21 and the outer fan 23 are connected by the rotating shaft 24 a in the shaft 24 and the motor 22 is driven, whereby the outer fan 23 can be rotated together with the inner fan 21. This eliminates the need to install electronic parts such as a motor that requires resistance to the external environment such as water resistance (such as operation even when exposed to wind and rain) outside the sealed casing 11. Further, as shown in FIG. 3, by providing the shaft 24 with a sealing property, high water resistance, dust resistance and the like can be obtained.

  As shown in FIG. 5, the outer fan 51 may be covered with an outer cover 51 to further improve resistance to the external environment such as water resistance.

Embodiment 2. FIG.
Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 6 is a schematic configuration diagram of the sealed casing provided with the air cooling mechanism B. FIG. 7 is an enlarged view of the air cooling mechanism B shown in FIG. FIG. 8 is a schematic mounting diagram of the air cooling mechanism B. FIG. FIG. 9 is a diagram illustrating an example of an assembly method of the air cooling mechanism B. FIG. 10 is a diagram showing that a cover is attached to the outer fan of the air cooling mechanism B. FIG. 6 to 10 that are the same as those in FIGS. 1 to 5 are the same as those in the first embodiment, and a description thereof will be omitted.

  In the air cooling method using the air cooling mechanism B shown in FIGS. 6 and 7, the motor 22 is driven to rotate the inner fan 21 and the outer fan 23, as in the first embodiment. The internal gas and external gas are forcedly convected to dissipate heat. Therefore, the description of the operation of the second embodiment is omitted.

  However, the difference from the first embodiment is that a plate such as a flat support plate 61 is used instead of the sealed casing 11 to penetrate the shaft 24 having the rotation shaft 24a. Then, a hole larger than the shaft 24 is provided in the mounting surface of the sealed casing 11, and the support plate 61 itself is mounted so that one end of the shaft 24 protrudes inside the sealed casing 11 and the other end protrudes outside. This facilitates the mounting of the shaft 24 to the sealed casing 11.

  The support plate 61 through which the shaft 24 passes is attached to the sealed casing 11 with bolts 62, washers 63, and nuts 64. Here, in order to provide sealing to the bolting of the support plate 61, the washer 63 is an elastic washer such as a rubber washer.

  FIG. 8 shows a schematic view of mounting of the support plate 61. Fig.8 (a) is the attachment schematic of the support plate 61 seen from direction a among the arrows of FIG. FIG.8 (b) is the attachment schematic diagram of the support plate 61 seen from direction b among the arrows of FIG. FIG. 8C is a cross-sectional view (in the middle of attachment) seen from the arrow A in FIGS. 8A and 8B.

  Here, the O (O) ring 71 shown in FIG. 8C is an elastic O-ring such as rubber, for example, and is arranged between the support plate 61 and the sealed housing 11 and bolted. , To keep the seal between them. The hole 72 is a hole for projecting the shaft 24 penetratingly fixed to the support plate 61 into and out of the sealed casing 11. As shown in FIG. 8C, the O-ring 71 is pressed between the support plate 61 and the sealed casing 11 by tightening and fixing the bolt 62, the washer 63, and the nut 64. Thereby, the sealing between the sealed casing 11 and the support plate 61 is provided.

  With respect to the air cooling mechanism B shown in FIGS. 6 to 8, an example of a method for attaching the support plate 61 to the sealed casing 11 will be described with reference to FIG. Note that FIG. 9 is viewed from the same direction as FIG.

  (Procedure 1) A hole 72 is opened in the sealed casing 11. In FIG. 9, the hole 72 is a square, but the shape is not necessarily limited to a square. The shaft 24 may be protruded into and out of the sealed casing 11 and may be any hole smaller than the O-ring 71 for maintaining the sealing performance between the sealed casing 11 and the support plate 61.

  (Procedure 2) Around the hole 72, an O-ring 71 for maintaining the sealing property between the sealed casing 11 and the support plate 61 is disposed. When the O-ring 71 is disposed and the sealed casing 11 and the support plate 61 are fixed with the bolts 62, a groove is provided on at least one of the sealed casing 11 and the support plate 61 so that the position of the O-ring 71 does not shift. May be provided.

  (Procedure 3) A hole for attaching the shaft 24 is made in the support plate 61, and the shaft 24 is attached. At that time, as in the first embodiment, grooves for the bearing 31 and the oil seal 32 are provided in advance, and the bearing 31 and the oil seal 32 are fixed by the cover 33 so that the sealing performance of the support plate 61 is maintained. In addition, the support plate 61 is provided with a screw hole 91 for attaching to the sealed casing 11.

  (Procedure 4) Similarly, a screw hole for fixing the support plate 61 is provided in the sealed casing 11, and the support plate 61 is fixed to the sealed casing 11 using bolts 62, washers 63, and nuts 64. By fastening with the bolt 62, the washer 63, and the nut 64, the O-ring 71 is pressed between the sealed casing 11 and the support plate 61, and the sealing property can be maintained.

  In the subsequent assembly method, as in the first embodiment, the inner fan 21 and the motor 22 are attached inside the sealed casing 11, and the outer fan 23 is attached outside the sealed casing 11.

  As in the second embodiment, the shaft 24 is attached to the support plate 61 and then attached to the sealed casing 11, so that the bearing 31 is attached to the sealed casing 11 in addition to the effects obtained in the first embodiment. In addition, it is possible to obtain an effect that the difficulty in processing the sealed casing 11 by providing a groove for the oil seal 32 in advance is eliminated.

  As in the first embodiment, as shown in FIG. 10, an outer cover 51 may be covered with the outer fan 23 to further improve resistance to the external environment such as water resistance.

3 is a schematic configuration diagram of a sealed casing provided with an air cooling mechanism A according to Embodiment 1. FIG. 3 is an enlarged view of an air cooling mechanism A in Embodiment 1. FIG. 6 is a diagram illustrating an example of an assembly method of the air cooling mechanism A in Embodiment 1. FIG. It is a figure which shows the inner side heat sink fin and outer side heat sink fin attached to the airtight housing | casing in Embodiment 1. FIG. FIG. 6 is a diagram showing that a cover is attached to the outer fan of the air cooling mechanism A in the first embodiment. 6 is a schematic configuration diagram of a sealed casing provided with an air cooling mechanism B according to Embodiment 2. FIG. 6 is an enlarged view of an air cooling mechanism B according to Embodiment 2. FIG. FIG. 10 is a diagram showing an attachment schematic diagram of an air cooling mechanism B in the second embodiment. 6 is a diagram illustrating an example of an assembly method of an air cooling mechanism B according to Embodiment 2. FIG. FIG. 10 is a diagram showing that a cover is attached to an outer fan of the air cooling mechanism B in the second embodiment.

Explanation of symbols

11. Sealed housing 12. Heat generating component 13. Inner endothermic fin 14. Outer radiating fin 15. Forced convection of internal gas Forced convection of external gas 17. Heat conduction from the heat generating component to the internal gas 18. 18. Heat conduction from the internal gas to the sealed casing 21. Heat conduction from sealed enclosure to external gas Inner fan 22. Motor 22a. Bearing 22b. Bearing support member 22c. Magnet (stator)
22d. Coil 23. Outer fan 24. Shaft 24a. Rotating shaft 31. Bearing 32. Oil seal 33. Cover 51. Outer cover 61. Support plate 62. Bolt 63. Washer (made of rubber)
64. Nut 71. O-ring (made of rubber)
72. Hole 91. Screw hole A. Air cooling mechanism Air cooling mechanism

Claims (5)

A housing having a hole penetrating a rotating shaft having one end protruding inside the mounting surface and the other end protruding outside the mounting surface;
An inner fan attached to one end of the rotating shaft;
An outer fan attached to the other end of the rotating shaft;
A motor provided inside the housing and for rotating the inner fan;
An air cooling device characterized by comprising: A plate with a rotating shaft through it;
A housing having a hole on the mounting surface, and the plate mounted on the mounting surface so that one end of the rotating shaft protrudes inward and the other end protrudes outward;
An inner fan attached to one end of the rotating shaft;
An outer fan attached to the other end of the rotating shaft;
A motor provided inside the housing and for rotating the inner fan;
An air cooling device characterized by comprising: By driving the motor, the inner fan and the outer fan are rotated,
By rotating the inner fan, the inside gas of the housing is sucked along the mounting surface, and exhausted into the housing, thereby transferring the heat in the housing to the mounting surface.
By rotating the outer fan, the outside gas of the housing is sucked and exhausted to the outside of the housing along the mounting surface, so that the heat transmitted to the mounting surface is dissipated to the external gas and the housing is cooled. To
The air-cooling apparatus according to claim 1 or 2, wherein An endothermic fin disposed on the inside of the mounting surface of the housing and attached in the vicinity of the inner fan; and
A heat dissipating fin disposed near the outer surface of the housing and attached in the vicinity of the outer fan,
The air cooling device according to any one of claims 1 to 3, further comprising: By driving the motor, the inner fan and the outer fan are rotated,
By rotating the inner fan, the inside gas of the housing is sucked along the mounting surface, and exhausted into the housing, thereby transferring the heat in the housing to the heat sink fins.
By rotating the outer fan, the outside gas of the casing is sucked and exhausted to the outside of the casing along the mounting surface, thereby radiating the heat transmitted from the heat absorbing fins to the heat radiating fins. Cooling,
The air cooling apparatus according to claim 4.

Images