JPH05102687A - Cooler for housing - Google Patents

Abstract

PURPOSE:To prevent a decrease in life of an inner fan by mounting the fan for sucking the inner air along part of an inner opening to the inside of a housing in a casing and an outer fan along part of an outer opening. CONSTITUTION:When the inner air A is heated by heats from an electronic apparatus, a control unit, etc., contained in a housing 1, the air A is repeatedly brought into contact with a heat receiver 40 of a heat pipe 4 by the operation of fans 5, 6 to derive its heat, which is externally discharged out of the housing l by the outer air of a low temperature in contact with an upper radiator 41. It is so set that the upper limit temperature of the air A of the housing 1 does not become 60-70 deg.C or higher. Since the fan 5 is so operated as to suck the air A from the lower half of a casing 2 to the inside of the housing 1, the air passing the fan 6 is cooled by heat exchanging of the pipe 4. Accordingly, a decrease in life of the fan 5 due to the heat is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe type cooling structure for a housing in which various electronic parts, a control unit and the like are housed.

[0002]

2. Description of the Related Art As a device for cooling the inside of a sealed casing so that the inside space of the casing can be effectively used, there is, for example, the one disclosed in Japanese Patent Publication No. 3-40567.
This cooling device will be described with reference to FIG. 4. Reference numeral 1 is a closed casing, 2 is a casing mounted along one side surface of the casing 1, and the inside of the casing 1 of the casing 2 is shown. The inside opening 20 is formed on a part of the side wall facing the inside of the casing 1, and the outside opening 21 is formed on a side wall of the housing 1 facing the outside at a position not facing the inside opening 20. Is
Partition plate 3 for partitioning the internal air A and the external air B of the housing 1
Is attached. A heat pipe 4 with fins is penetratingly supported by the partition plate 3 so as to be parallel to the side surface of the housing 1. The inner open portion 2 of the heat pipe 4 is provided.
The portion facing 0 is the heat receiving portion 40, and the portion facing the outer open portion 21 is the heat radiating portion 41. Inside the casing 2, an internal fan 50 facing a part of the heat receiving portion 40 of the heat pipe 4 and an external fan 60 facing a part of the heat radiating portion 41 are attached. Internal fan 50
The internal air A of the casing 1 is passed through the heat receiving portion 40 of the heat pipe 4 facing the fan 50, and then the direction of the heat receiving portion 40 of the heat pipe 4 is changed so as not to face the fan 50. It is arranged so as to flow back into the housing 1 and to flow back into the housing 1. That is, the internal fan 50 is the casing 2
It operates so as to push the internal air A into the lower half of the inside. Further, the external fan 60 allows the external air B to flow through the heat radiating portion 41 of the heat pipe 4 facing the fan 60,
It is arranged so that the direction is changed and the heat is radiated to the outside through the heat radiating portion 41 of the heat pipe 4 which does not face the fan 60. The cooling device has the above-mentioned configuration.
The heat receiving portion 40 of the heat pipe 4 that is in contact with the internal air A of the housing 1 and the heat radiating portion 41 that is in contact with the external air B exchange heat, and the electronic components (not shown) mounted in the housing 1 are shown. The internal air A, which has reached a high temperature, is cooled by the heat generated from the parts and the control unit.

[0003]

According to the conventional cooling device, as described above, the internal fan 50 has the high temperature internal air A.
Since it acts so as to push into the casing 2, the internal fan 50 is constantly in contact with the high-temperature internal air A before the heat is removed by the heat receiving portion 40 of the heat pipe 4. Therefore, there is a drawback that the life of the internal fan 50 tends to be shortened due to the high heat. The decrease in the service life of the internal fan 50 is due to the temperature dependence of the bearing grease of the fan 50, and the service life of the bearing of the fan 50 is shortened almost in proportion to the increase in the temperature of the internal air A. An object of the present invention is to provide a cooling device that improves the problems of the conventional cooling device as described above and further improves the life of the internal fan that contacts high temperature.

[0004]

In order to achieve the above-mentioned object, a cooling device for a housing according to the present invention is mounted along one side surface of a sealed housing, and a side wall facing the inside of the housing. A casing having an inside opening portion, and a casing having an outside opening portion in a portion of a side wall facing the outside of the housing and not facing the inside opening portion, and the casing.
A partition plate that separates the inside of the enclosure into internal air and external air of the housing, and a heat receiving portion in the inner open portion and a heat radiating portion in the outer open portion are supported by the partition plate so as to face each other. A heat pipe, an internal fan mounted along the part of the inner opening in the casing, and an external fan mounted along the part of the outer opening in the casing. Of the heat pipe facing the internal fan, after the internal air of the housing is caused to flow through the heat receiving portion of the heat pipe that does not face the internal fan. It is installed in a state in which the heat is passed through the heat receiving portion and is returned to the inside of the housing. It is preferable that the heat pipe is installed with a slight inclination such that a tip of the heat receiving portion is moved away from the inner open portion and a tip of the heat radiating portion is moved away from the outer open portion.
In this case, the internal fan is attached so as to face the portion of the heat receiving portion of the heat pipe facing the front end, and the external fan is attached so as to face the portion of the heat pipe radiating portion near the front end.

[0005]

Like the conventional cooling device, the cooling device according to the present invention radiates the heat inside the casing to the outside by heat exchange between the heat receiving portion and the heat radiating portion of the heat pipe, but cools the inside of the casing. The internal fan of the cooling device according to the present invention acts so as to suck the internal air from the inside of the casing to the inside of the housing by the above-mentioned configuration. Therefore, the internal air of the housing that passes through the internal fan is always the air after the heat is removed from the heat receiving portion of the heat pipe, and the internal fan has a lower temperature than that of the internal fan of the conventional cooling device. The life of the internal fan is further improved due to the contact with air. If the heat pipe is installed with a slight inclination as described above, the distance between the heat pipe heat receiving portion near the tip and the inside opening of the casing, and the heat pipe heat radiation portion near the tip. Since the space between the casing and the outside opening is relatively wide, the space for installing the cooling device can be made narrower.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a cooling device according to the present invention will be described below with reference to FIGS. 1 is a partial cross-sectional view showing an embodiment of a cooling device according to the present invention, FIG. 2 is a partial cross-sectional view showing another embodiment, and FIG. 3 is a diagram showing a continuous operation time of a fan and a temperature of air contacting the fan. It is a diagram showing a relationship.

A casing 2 is attached along a part of the peripheral wall of the case 1 which is hermetically sealed, and the casing 2 is opened at the lower part of the side wall facing the inside of the case 1 inside. The opening 20 is formed, and the outer opening 21 is formed by opening the upper portion of the side wall facing the outside of the housing 1.

A partition plate 3 is mounted in the casing 2 so as to separate the interior of the casing 2 into the internal air A and the external air B of the housing 1. The partition plate 3 is attached to the partition plate 3. Includes a heat receiving portion 40 on the inner open portion 20, and an outer open portion 21.
The heat pipe 4 is penetratingly supported so that the heat radiating portions 41 face each other. The heat pipe 4 of this embodiment is
The side surface of the housing 1 to which the casing 2 is attached so that the heat receiving portion 40 gradually moves away from the inner open portion 20 and the heat radiating portion 41 gradually moves away from the outer open portion 21 as the distance from the partition plate 3 increases. It is attached at an angle of 3 ° to 10 °.

Inside the casing 2, an internal fan 5 is attached along the lower portion of the inner open portion 20, and an external fan 6 is attached along the upper portion of the outer open portion 21. The internal fan 5 receives the internal air A of the housing 1 from the heat receiving portion 40 of the heat pipe 2.
After being made to flow to a portion which does not face, the direction is changed downward, and it is made to flow to the portion of the heat receiving portion 40 of the heat pipe 2 which faces the fan 5 to be returned to the inside of the housing 1. Has been done. Therefore, the fan 5 acts so as to suck the air in the casing 2 into the housing 1. Further, the external fan 6 allows the external air B to flow through the portion of the heat dissipation portion 41 of the heat pipe 2 that faces the fan 6, and
It is arranged so that the direction is changed downward, and the heat is radiated to the outside through the portion of the heat dissipation portion 41 of the heat pipe 2 that does not face the fan 6. Therefore, the fan 6 acts so as to push the external air B into the upper half portion of the casing 2, but the fan 6 may act so as to suck the air in the upper half portion of the casing 2 to the outside. ..

According to the cooling device of this embodiment, when the internal air A is heated by the heat generated from the electronic equipment, the control unit, etc. (not shown) stored inside the housing 1,
By the operation of the fans 5 and 6, the internal air A is repeatedly contacted with the heat receiving portion 40 of the heat pipe 4 to take heat, and the heat is removed from the outside of the housing 1 by the low-temperature external air that comes into contact with the upper heat radiating portion 41. Is released to.

In the cooling device of the above embodiment, the internal air A of the housing 1 is set so that the upper limit temperature does not exceed 60 to 70 ° C. However, the internal fan 5 lowers the internal air A under the casing 2. The air passing through the fan 5 is already cooled by the heat exchange of the heat pipe 4 since it acts to suck the air from the inside of the half portion to the inside of the housing 1, and therefore, the life of the fine 5 is prevented from being shortened by heat. It

The relationship between the temperature of the installation space and the life of the fan depends on the temperature dependence of the bearing grease of the fan motor. When the installation space reaches a certain temperature or higher, the life of the bearing of the fan motor rapidly increases. descend. Fig. 3 shows the bearing life of a general fan motor (continuous operation time).
And shows the experimental results of the relationship with the fan installation space,
As can be seen from the one-dot chain line life curve a, the life of the fan motor is almost constant until the temperature of the installation space reaches 50 ° C, but as the temperature exceeds 50 ° C, the life of the fan motor rapidly increases. descend. For example, if the internal temperature of the housing 1 is 6
When the cooling device is operated so as to be maintained at 0 ° C. or lower, in the cooling device having the conventional structure as shown in FIG. 4, since the internal air at 60 ° C. contacts the internal fan, the fan life is continuously operated as shown in FIG. It takes about 33600 hours for the heat pipe 4 in the cooling device constructed as in the above embodiment.
As a result, the internal air at 53.3 ° C., which has been lowered by an average of about 6.7 ° C., comes into contact with the internal fan, so the fan life is approximately 40,000 hours in continuous operation as shown in FIG. Therefore, when comparing the two, a life difference of 6400 hours occurs,
Although it seems to be slightly different in intermittent operation, if the operating time is simply converted into 10 hours / day × 25 days / month × 12 months / year, the cooling device of the above-mentioned embodiment is about 2. This will extend the life of the fan motor for one year.

Further, in the cooling device of the above-described embodiment, the heat pipe 4 is attached in a state of being slightly inclined with respect to the side surface of the relevant portion of the housing 1, so that the inner open portion which is the installation space for the fans 5 and 6 is provided. 20 and the heat receiving portion 40, and the outer open portion 2
1 and the heat dissipation part 41 are widened, and the installation space of the cooling device is narrowed.

In the above embodiment, the case 2 is attached to the inside of the side wall of the housing 1. However, as shown in FIG. 2, all or part of the casing 2 projects outside the housing 1. The same can be done even when mounted in a state. Also, the mounting position of the cooling device is
The same can be applied to the ceiling surface, the back surface, or the bottom surface of the housing 1.

[0015]

According to the housing cooling device of the present invention,
It is possible to prevent the life of the fan from decreasing. Further, if the heat pipe is slightly inclined with respect to the side surface of the housing in the installation portion, it is possible to provide a cooling device that can be installed in a narrower installation space without adversely affecting the heat exchange function. ..

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of a cooling structure according to the present invention.

FIG. 2 is a partial cross-sectional view showing another embodiment of the cooling structure according to the present invention.

FIG. 3 is a diagram showing the relationship between the operating time of the fan, the temperature of the installation space, and the life of the fan motor.

FIG. 4 is a partial cross-sectional view of a conventional housing cooling device.

[Explanation of symbols]

 1 Case 2 Casing 20 Inner Opening Part 21 Outer Opening Part 3 Partition Plate 4 Heat Pipe 40 Heat Receiving Part 41 Heat Dissipating Part 5,50 Internal Fan 6,60 External Fan A Internal Air B External Air a Fan Motor Life Curve

Claims (2)

[Claims] 1. An inner opening is attached to a part of a side wall of the sealed housing which faces the inside of the housing, and a side wall of the side wall facing the outside of the housing. A casing which has an outside opening portion in a part that does not face the inside opening portion, a partition plate for separating the inside of the casing into the internal air and the external air of the housing, and A heat receiving part in the inner open part, a heat pipe penetratingly supported by the partition plate in a state where the heat dissipating part faces the outer open part, respectively, and a part of the inner open part in the casing. An internal fan is installed and an external fan is installed in the casing along a portion of the outer opening. The internal fan does not face the internal air of the housing to the internal fan. After passing through the heat receiving part of the heat pipe, A cooling device for a case, wherein the cooling device is installed in a state in which the heat is converted into a heat receiving part of the heat pipe facing the internal fan and is returned to the inside of the case. 2. The heat pipe is installed so as to be slightly inclined such that a tip of the heat receiving portion is moved away from the inner opening portion and a tip of the heat radiation portion is moved away from the outer opening portion. The cooling device for the housing according to.