JPH0741262U - Outdoor enclosure cooling structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cooling structure for suppressing a temperature rise in an outdoor housing having a heat source inside. A heat radiation fin of, for example, a heat pipe placed outside the housing, a continuous ventilation duct that is provided outside the housing and discharges all the introduced outside air by contacting the heat radiation fin, and the ventilation duct and the side wall of the housing are thermally insulated. It is provided with a heat insulating member and a drip-proof cover provided at the ventilation duct exhaust port. [Effect] It is possible to effectively cool the radiation fins, suppress an increase in temperature inside the housing, and suppress failure and corrosion due to raindrops.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an outdoor installation housing for electronic devices, communication devices and the like, and more particularly to a cooling structure suitable for suppressing a temperature rise inside the housing.

[0002]

[Prior art]

 In a conventional outdoor installation type housing such as an electronic device and a communication device, as shown in FIG. 7, the heat generated from the heat source 10 inside the closed housing 11 is absorbed by the heat absorbing fins 3 of the heat pipe 1. The heat radiation fins 2 provided in the heat radiation portion of the heat pipe 1 are heated. The heat emitted from the heat radiation fins 2 is guided by the exhaust fan 5 and flows through the heat radiation fins 2 from the exhaust port 4 by the flow of air created in the gap between the closed casing 11 and the shade plate 13. Released to the outside. In addition, the air heated by the heat source 10 in the housing is guided to the intake fan 7 and exchanges heat with the heat-absorbing fins 3 of the heat-absorbing portion of the heat pipe 1 to be cooled. To cool the inside of the housing 11. In FIG. 7, the flow of heat-exchanged air is regulated by the cover 9, and a heat insulating cover 8 is lined on a part of the cover 9 in order to prevent the heat of the heat radiating portion from being transferred into the housing 11.

Here, the principle of cooling by a known heat pipe will be described with reference to FIG. FIG. 6 shows an example of a heat pipe. A cross section of the container 22 of the heat pipe 21 is shown, and a working liquid 23 is contained in a container 22 in which a porous material called a wick 24, such as a wire mesh or a metal felt, is stretched on the inner wall. As an example, it has a structure in which an appropriate amount of water, ammonia, acetone, etc. is enclosed and decompressed, and a heat absorbing part (evaporating part) that receives heat from the outside and a heat radiating part (condensing part) that receives heat from the outside with the partition plate 27 as a boundary. Part), and a heat absorbing fin 26 and a heat radiating fin 25 are attached to each. The working fluid 23 inside the container 22 is evaporated by the heat from the heat absorbing fins 26 in the heat absorbing portion, and the vapor reaches the heat radiating portion through the central vapor passage due to a slight pressure difference, where it is condensed / liquefied. To do. At this time, latent heat is released and is radiated through the radiation fins 25 outside the heat pipe. The liquid in the wick 24 is returned to the heat absorbing portion by the capillary force of the wick 24, and the same operation is repeated thereafter.

The heat extracted from the inside of the closed casing 11 by the heat pipe rises in the gap formed by the shade plate 13 on the rear face of the casing and is discharged to the outside.

[0005]

[Problems to be solved by the device]

 As shown in FIG. 8, FIG. 9, and FIG. 10, the conventional outdoor-installed hermetically sealed enclosure is provided with a awning plate 13 that blocks heat input by direct sunlight from the ceiling and side surfaces, but No particular consideration is given to the flow. Therefore, as shown in FIG. 7, the airflow flowing into the heat radiating portion of the heat pipe 1 comes into contact with the heat radiating fins 2 in a state where the warm air coming out of the exhaust port 4 and the outside air are mixed with each other, so that the hermetically sealed housing is closed. There was a problem that the cooling effect inside 11 was hindered.

[0006] Furthermore, since no consideration is given to drip-proof between the closed casing 11 and the shade plate 13 on the ceiling or the side wall, rain drops are applied to the exhaust fan 5 and the performance of the fan motor is deteriorated. There was also a problem.

In view of the above problems of the prior art, the present invention aims to provide a cooling structure for an outdoor closed casing having a large cooling effect and a drip-proof structure.

[0008]

[Means for Solving the Problems]

 The above-mentioned problem is solved by radiating fins provided outside the side wall of the outdoor hermetically sealed housing and outside the housing by being provided outside the side wall of the housing and bringing all the outside air introduced from below the housing into contact with the radiating fins. This is solved by providing a continuous ventilation duct that discharges upwards of the housing and a heat insulating member that insulates the side wall of the housing and the ventilation duct.

Here, the heat radiation fin may be attached to a heat radiation portion of a heat pipe provided so as to penetrate the side wall of the housing.

In this heat pipe, the heat radiating portion outside the housing may be bent substantially at right angles to the heat absorbing portion inside the housing.

Further, it is preferable that a drip-proof cover is provided at a portion of the ventilation duct where the air flow is discharged upward.

[0012]

[Action]

 By the exhaust fan provided at the upper exhaust port of the ventilation duct, all the outside air sucked from the lower opening of the ventilation duct contacts the heat radiation fins, and the warmed air is discharged to the outside from the ventilation duct exhaust port by the exhaust fan. . In this way, the radiation fins are effectively cooled, and the heat exchange effect of the heat pipe is enhanced.

Further, the direct light of the sun is blocked by a ventilation duct that covers the ceiling portion, the shades on the side surfaces and one side wall width.

When the heat radiating portion outside the housing of the heat pipe provided penetrating the side wall of the housing is bent substantially at right angles to the heat absorbing portion inside the housing to be substantially orthogonal to the ventilation duct, the heat radiating fin is Since it is parallel to the air flow in the ventilation duct, air resistance loss can be reduced.

Since the drip-proof cover is provided near the exhaust port above the ventilation duct, the exhaust fan and the radiating fins are protected from rain and snow, water droplets penetrate into the fan motor, and the radiating fins are corroded. There is no such thing.

[0016]

【Example】

 The present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. Since the ambient temperature inside the outdoor-installed closed casing 11 is higher than the outside air temperature by the internal heat source 10, the casing is used to carry this heat to the outside. A heat pipe 1 which penetrates a cover 9 forming a part of a side wall of a body 11 is provided, and a heat radiating fin 2 and a heat absorbing fin 3 are attached to a heat pipe heat radiating portion outside the housing and a heat pipe heat absorbing portion inside the housing, respectively. The air warmed by the heat source 10 passes through the heat pipe heat-absorbing fin 3 and exchanges heat with the intake fan 7 provided below the heat pipe heat-absorbing portion, and then passes through the intake port 6 to re-enter the housing 11 again. It is returned to the inside to cool the inside of the housing.

On the other hand, the heat radiation fins 2 of the heat pipe heat radiation portion outside the housing are heated by the heat radiation from the heat pipe 1. The heat radiated from the heat radiation fins 2 is carried away by the air flow in the ventilation duct 12 provided along the wall surface of the housing 11 on which the heat pipe 1 is attached, with the wall surface and the void 18 provided therebetween.

As shown in FIG. 1, the outside air introduced from the lower opening of the ventilation duct 12 rises in the duct according to the arrow 20 and entirely contacts the radiating fins 2 of the heat radiating portion of the heat pipe 1 so that the outside air reaches the duct. The inner guide plate 14 guides the heat to the radiating fins 2 side, and after the heat is absorbed, the exhaust fan 5 provided at the upper exhaust port 4 of the ventilation duct 12 discharges the heat to the outside as indicated by arrow 20.

A bent cover 9 is formed in order to regulate the flow of air on the housing 11 side, and an upper half portion of the cover 9 is formed in order to block heat transfer from high temperature air in the upper part of the housing 11. Is lined with a heat insulating cover. In this way, the ventilation duct 12 that is continuous so that the entire amount of the introduced outside air passes through the heat pipe radiating fins 2 is mounted by the mounting bracket 17 while holding the housing 11 and the space 18. The gap 18 may be 1 to 2 mm, and a heat insulating material may be sandwiched in the gap.

The upper opening of the ventilation duct 12 and the upper and side portions of the exhaust fan 5 are covered with a drip-proof cover 15 to prevent raindrops from entering the fan motor and the radiation fins 2.

As for the appearance of this embodiment, as shown in FIGS. 2, 3 and 4, since the ventilation duct 12 is provided on one side surface of the housing 11, the outer dimensions do not become particularly large. It does not spoil the appearance.

FIG. 5 shows a second embodiment of the present invention, in which the heat radiating portion of the heat pipe 1 is bent at a substantially right angle to the heat absorbing portion and the heat radiating fins 2 are arranged parallel to the air flow in the ventilation duct 12. However, it is characterized by reducing the resistance loss of the air flow.

In general, a heat pipe is most efficient when it is in an upright state with its heat absorbing part (evaporating part) facing down and its heat radiating part (condensing part) facing up. Also, the cooling capacity when the heat pipe is horizontal is not significantly reduced because the hydraulic fluid is returned to the evaporation section by the capillary force of the wick. Furthermore, when the evaporation part is on the top and the condensation part is on the bottom, that is, when it is used against gravity, the hydraulic fluid cannot flow back to the evaporation part if the capillary force of the wick is in equilibrium with gravity. Therefore, the heat pipe will not work. However, if the mesh of the wick is fine, it is said that the decline in the ability to process heat when the condensing part of the heat pipe is turned upside down by about 10 degrees is about 10%. Therefore, even if the heat pipe is bent at a right angle, the angle does not require high accuracy.

In the case of this embodiment, since the flow path of the air passing through the radiation fins 2 is not bent, the air resistance loss is small and the required air volume of the exhaust fan 5 can be reduced.

Although the heat pipe type heat exchanger is used in each of the above-mentioned embodiments, the present invention can be similarly applied to the case of using the air-air type heat exchanger or the electronic cooling element. The same can be applied to the case where the heat source 10 is directly attached to the inside of the housing 11 and the radiation fins are provided on the outside thereof. Further, the radiation fin 2 is also within the scope of the present invention when it is processed with a large surface area by using a dimple plate or the like.

[0027]

EFFECTS OF THE INVENTION According to the present invention, it is possible to bring all the amount of the introduced outside air into contact with the radiating fins of a heat exchanger, such as a heat pipe, which carries out the heat in the outdoor-installed closed casing. Since the ventilation duct is installed over the entire width of one side wall of the housing with a gap between the ventilation duct and the housing, the radiation fins are effectively cooled to improve the performance of the heat exchanger. Since it blocks the direct light of the sun, the temperature rise inside the housing can be significantly suppressed.

Further, when the heat radiating part of the heat exchanger is bent substantially at right angles to the heat absorbing part and is made to directly face the ventilation duct, the radiating fin becomes parallel to the air flow in the ventilation duct. Air resistance loss is further reduced, and the capacity of the exhaust fan in the ventilation duct can be reduced.

Furthermore, since a drip-proof cover is provided near the upper exhaust fan of the ventilation duct, raindrops can be prevented from entering the fan motor and the heat radiation fins, and failure and corrosion of the device can be suppressed, resulting in a maintenance-free effect. Play.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a front view showing the appearance of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is a bottom view of FIG.

FIG. 5 is a longitudinal sectional view of a main part of a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a cooling principle by a known heat pipe.

FIG. 7 is a longitudinal sectional view of a main part of a conventional outdoor housing.

8 is a front view showing the appearance of FIG. 7. FIG.

9 is a side view of FIG.

FIG. 10 is a bottom view of FIG.

[Explanation of symbols]

 1 heat pipe 2 heat radiation fin 3 heat absorption fin 4 exhaust port 5 exhaust fan 6 intake port 7 intake fan 8 heat insulation cover 9 cover 10 heat source 11 case 12 ventilation duct 13 sunshade plate 14 guide plate 15 drip cover 16 sunscreen mounting bracket 17 Ventilation Duct Mounting Bracket 18 Void 20 Air Flow 21 Heat Pipe (Principle Diagram) 22 Container 23 Hydraulic Fluid 24 Wick 25 Radiating Fin 26 Endothermic Fin 27 Partition Plate

Claims (7)

[Scope of utility model registration request] 1. In a cooling structure for an outdoor housing having a heat source inside, a radiation fin placed outside a side wall of the housing, and a fin provided outside the housing and introduced from below the housing. A continuous ventilation duct that allows the entire amount of the outside air to come into contact with the heat radiation fins to pass therethrough and to be discharged upward from the outside of the housing; and a heat insulating member that thermally insulates the ventilation duct and the housing side wall. Outdoor enclosure cooling structure. 2. The cooling structure for an outdoor housing according to claim 1, wherein the heat radiation fins are attached to a heat radiation portion of a heat pipe provided so as to penetrate the housing side wall. 3. The outdoor housing according to claim 2, wherein the heat radiating portion of the heat pipe is formed substantially at right angles to the heat absorbing portion of the heat pipe, and is disposed substantially orthogonal to the axis of the ventilation duct. Cooling structure. 4. The outdoor casing cooling structure according to claim 1, wherein an exhaust fan is provided at an exhaust port of the ventilation duct that discharges upward. 5. The cooling structure for an outdoor housing according to claim 1, further comprising a drip-proof cover near the exhaust port of the ventilation duct. 6. The outdoor enclosure cooling structure according to claim 1, wherein the lateral width of the ventilation duct is substantially equal to the width of the side wall of the enclosure. 7. The cooling structure for an outdoor housing according to claim 1, wherein the ventilation duct is attached to the side wall of the housing with a predetermined gap.