JP2000012338A - Cooling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heat radiating efficiencies of the heat radiating fins of a cooling apparatus while resource conservation is contrived against the fin material by extending a chimney duct upward from the periphery of the heat radiating fins. SOLUTION: In a transformer using a heat-pipe cooling apparatus, heat radiating fins 4 are attached to heat pipes 2 on the outside of a transformer case 5 and a chimney duct 1 is extended upward from the periphery of the fins 4. In addition, a heat collecting fins 3 are attached to heat pipes 2 in the case 5 and the main body 7 of the transformer and the heat collecting fins 3 are set up so that the main body 7 and fins 3 may be dipped in electrically insulating oil 6. The heat energy resulting from the heat generated from the main body 7 is collected by means of the heat collecting fins 3 through the oil 6 and transmitted to the heat radiating fins 4 through the heat pipes 2 and radiated on the natural convection of air. In this case, the speed of natural convection of air cooling the heat radiating fins 4 becomes faster, because the chimney duct 1 accelerates the natural convection of air collecting the heat from the heat radiating fins 4. Therefore, the heat radiating efficiencies of the heat radiating fins 4 are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device provided with a heat transport element having a heat collecting portion and a heat radiating portion.

[0002]

2. Description of the Related Art Conventionally, a heat pipe for transferring heat by a cycle of evaporation by heat absorption and condensation by heat release of a working fluid inside the pipe, or a pipe-shaped pipe for transferring heat by heat conduction of a material forming the pipe. As shown in Japanese Utility Model Publication No. Sho 60-39652 shown in FIG. 12, heat radiating fins 21 are provided on both sides of the heat pipe 20 in the longitudinal direction, as shown in FIG. It is structured to cool by natural convection.

Further, as described in Japanese Utility Model Application Laid-Open No. 4-23120, a surrounding plate is provided on the outer periphery of a heat radiating rib of a transformer to promote natural convection of cooling air.

[0004]

However, in the structure of the radiating fin shown in FIG. 12 described in Japanese Utility Model Publication No. 60-39652, depending on the height of the fin, the length of the fin, and the size of the gap between the fins. , The efficiency of natural convection becomes extremely low. Therefore, in order to increase the amount of heat radiation, a larger heat radiation fin is required, and the occupied volume of the heat radiation fin becomes large, which causes a problem that resource saving becomes difficult.

In the structure described in Japanese Utility Model Application Laid-Open No. 4-23120, the cooling structure may vary depending on the arrangement of the surrounding plate of the transformer and the radiating ribs of the transformer and the structure of the surrounding plate such as the height. There was a problem that the effect of promoting natural convection of air was not sufficiently obtained. An object of the present invention is to solve the above-mentioned problems, and to provide a cooling device capable of improving the heat radiation efficiency of the heat radiation fins while saving resources of the fin material.

[0006]

According to a first aspect of the present invention, there is provided a cooling device comprising: a heat collecting portion; a heat radiating fin; a heat transport element for transferring heat from the heat collecting portion to the heat radiating fin; And a chimney duct extending upward from the stack. According to the cooling device of the first aspect, by extending the chimney duct upward from the periphery of the radiation fin, the natural convection velocity of the medium for cooling the radiation fin is improved, and the cooling device is excellent without using a large radiation fin. Heat dissipation efficiency can be realized.

A cooling device according to a second aspect is characterized in that, in the first aspect, the inner peripheral dimension of the chimney duct is 100% or more and 120% or less of the outer dimension of the radiation fin. According to the cooling device of the second aspect, in addition to the function of the first aspect, by setting the inner peripheral dimension of the chimney duct to be 100% or more and 120% or less of the outer dimension of the radiating fin, a natural cooling medium for cooling the radiating fin is provided. Convection speed is further improved,
It is possible to realize better heat dissipation efficiency without using large heat dissipation fins.

According to a third aspect of the present invention, in the cooling device according to the first or second aspect, the height of the chimney duct from the upper end of the radiation fin is not less than 5% and not more than 500% of the inner circumferential dimension of the chimney duct. It is a feature. According to the cooling device of the third aspect, in addition to the function of the first or second aspect, the height of the chimney duct from the upper end of the radiation fin is set to 5% or more and 500% or less of the inner circumferential dimension of the chimney duct. Thereby, the natural convection speed of the medium that cools the radiation fins is further improved, and more excellent radiation efficiency can be realized without using large radiation fins.

A cooling device according to a fourth aspect of the present invention is the cooling device according to the first aspect, wherein a partition plate for dividing the chimney duct into a plurality is provided in the chimney duct. According to the cooling device of the fourth aspect, in addition to the operation of the first aspect, the partition plate for dividing the chimney duct into a plurality is provided in the chimney duct,
The natural convection velocity of the medium that cools the heat radiation fins is further improved, and more excellent heat radiation efficiency can be realized without using large heat radiation fins.

According to a fifth aspect of the present invention, in the cooling device according to the fourth aspect, the partition width of the chimney duct by the partition plate is not less than 10% and not more than 70% of the height of the chimney duct from the upper end of the radiation fin. It is assumed that. According to the cooling device of the fifth aspect, in addition to the function of the fourth aspect, the partition width of the chimney duct by the partition plate is set to 10% or more and 70% or less of the height of the chimney duct from the upper end of the radiation fin. The natural convection velocity of the medium that cools the radiation fins is further improved,
It is possible to realize better heat dissipation efficiency without using large heat dissipation fins.

A cooling device according to a sixth aspect of the present invention is the cooling device according to the first aspect, wherein a heating element is provided above the radiation fins in the chimney duct. According to the cooling device of the sixth aspect, in addition to the function of the first aspect, by providing the heating element above the radiation fin in the chimney duct, the natural convection velocity of the medium for cooling the radiation fin is further improved. Further, more excellent heat radiation efficiency can be realized without using large heat radiation fins.

According to a seventh aspect of the present invention, there is provided a cooling device comprising: a heat collecting portion; a first radiating fin; a first heat transport element for transferring heat from the heat collecting portion to the first radiating fin; A chimney duct extending upward, a second radiating fin provided above the first radiating fin in the chimney duct, and a second heat transport element for transporting heat from the heat collecting portion to the second radiating fin. Things.

According to the cooling device of the present invention, the chimney duct extends upward from the periphery of the first radiating fin, and the second radiating fin is provided above the first radiating fin in the chimney duct. The natural convection speed of the medium that cools the radiation fins is further improved, and without using large radiation fins,
Excellent heat dissipation efficiency can be realized.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIGS. 1 to 4 show a first embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a partially cutaway side view of a transformer using a heat pipe cooling device, and FIG. 2 is a plan view of a transformer using the heat pipe cooling device.

1 and 2, reference numeral 1 denotes a chimney duct, 2 denotes a heat pipe serving as a heat transport element, 3 denotes a heat collecting fin serving as a heat collecting portion, 4 denotes a radiating fin, 5 denotes a transformer case,
Reference numeral 6 denotes an electrical insulating oil made of mineral oil, 7 denotes a transformer main body, and 8 denotes an electrode insulator. The heat radiating fins 4 are attached to the heat pipe 2 outside the transformer case 5, and the chimney duct 1 extends upward from around the heat radiating fins 4. A heat collecting fin 3 is attached to the heat pipe 2 inside the transformer case 5, and the transformer main body 7 and the heat collecting fin 3 are arranged so as to be immersed in the electric insulating oil 6.

Next, the operation of the above configuration will be described. The heat energy generated by the heat generated by the transformer body 7 is collected by the heat collecting fins 3 through the electric insulating oil 6, and the heat is further radiated by the heat pipe 2. The heat is transmitted to the fins 4 and is radiated by natural convection of air (medium). In this case, the natural convection of the air that has taken heat from the radiating fins 4 is promoted by the chimney duct 1, the natural convection speed of the air that cools the radiating fins 4 increases, and the heat radiation efficiency of the radiating fins 4 improves.

FIG. 3 shows the relationship between the ratio of the inner peripheral dimension of the chimney duct 1 to the outer dimension of the radiation fin 4 and the radiation efficiency.
Is shown in FIG. 3 shows that the external dimensions are vertical d = 150 mm,
Chimney duct 1 for radiating fins 4 with width w = 300 mm
Shows the relationship between the inner peripheral dimensional ratio and the heat radiation efficiency. The heat radiation efficiency is represented by the heat radiation amount when the chimney duct 1 is not provided.
00%.

FIG. 3 shows that the inner diameter of the chimney duct 1 (2 ×
(D + W)) is the outer dimension (2 × (d +
w)), the heat radiation fins 4
The heat radiation efficiency is extremely reduced, and is equal to or larger than 180% when the chimney duct 1 is not attached. Therefore, the inner peripheral dimension of the chimney duct 1 is 100% or more and 120% of the external dimension of the radiation fin 4.
By performing the following, highly efficient heat radiation can be performed.

FIG. 4 shows the relationship between the height of the chimney duct 1 and the heat radiation efficiency. FIG. 4 shows the relationship between the height H from the upper end of the radiation fin 4 of the chimney duct 1 and the radiation efficiency when the vertical and horizontal dimensions of the inner circumference of the chimney duct 1 are vertical D = 150 mm and horizontal W = 300 mm. The heat radiation efficiency is defined as 100% of the heat radiation amount when the chimney duct 1 is only around the radiation fins 4, that is, when the height of the chimney duct 1 is 0 mm from the upper end of the radiation fins 4.

FIG. 4 shows that the inner circumference of the chimney duct 1 (2 ×
If the ratio of the height H from the upper end of the radiating fins 4 of the chimney duct 1 to (D + W)) is less than 5%, the effect of the chimney duct 1 is extremely low. Is low. Accordingly, by setting the ratio of the height H from the upper end of the radiating fins 4 of the chimney duct 1 to the inner circumferential dimension of the chimney duct 1 to be 5% or more and 500% or less, the chimney duct 1 is unnecessarily raised and the material cost is increased. It is possible to perform highly efficient heat radiation while avoiding bulkiness.

According to the cooling device configured as described above,
By extending the chimney duct 1 upward from the periphery of the radiating fins 4, natural convection of air that has taken heat from the radiating fins 4 is promoted by the chimney duct 1, and the natural convection speed of the air that cools the radiating fins 4 is increased. The heat radiation fins 4 can be fast, and excellent heat radiation efficiency can be realized without using large heat radiation fins 4.
The radiation efficiency of the radiation fins 4 can be improved while saving resources.

Further, by setting the inner peripheral dimension of the chimney duct 1 to 100% or more and 120% or less of the outer dimension of the radiating fin 4, the natural convection speed of the air for cooling the radiating fin 4 is further improved, and the radiating fin is improved. The heat radiation efficiency of the heat radiation fins 4 can be further improved while saving resources of the heat radiation fins 4. Further, the ratio of the height H from the upper end of the radiation fin 4 of the chimney duct 1 to the inner peripheral dimension of the chimney duct 1 is set to 5% or more and 500% or more.
% Or less, the natural convection velocity of the air that cools the radiation fins 4 can be further improved, and the radiation efficiency of the radiation fins 4 can be further improved while saving the resources of the radiation fins 4.

Although FIG. 3 shows an example in which the outer dimensions of the heat radiation fins 4 are d = 150 mm and w = 300 mm, the present invention is not limited to these dimensions.
The inner peripheral dimension of the heat radiation fin 4 should be 100% or more
By setting the content to 20% or less, the same effect as above can be obtained. Further, FIG. 4 shows an example in which the vertical and horizontal dimensions of the inner circumference of the chimney duct 1 are set to D = 150 mm and W = 300 mm, but the present invention is not limited to this dimension. By setting the ratio of the height H from the upper end of the radiation fin 4 of the duct 1 to 5% or more and 500% or less,
The same effect as above can be obtained.

Further, in the first embodiment, an example is shown in which the chimney duct 1 is a quadrangular prism. However, the present invention is not limited to the quadrangular prism. For example, the same applies to a circular duct or a polygonal duct. The effect is obtained. Second Embodiment FIGS. 5 to 7 show a second embodiment of the present invention.
This will be described with reference to FIG.

FIG. 5 is a partially cutaway side view of a transformer using the heat pipe cooling device, and FIG. 6 is a plan view of the transformer using the heat pipe cooling device. 5 and 6, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 9 denotes a partition provided in the chimney duct 1. Heat pipe 2 outside transformer case 5
The radiating fins 4 are attached to the radiating fins 4, and the chimney duct 1 extends upward from around the radiating fins 4. Further, a plurality of partition plates 9 are provided inside the chimney duct 1 and above the radiation fins 4 in a lateral direction of the chimney duct 1.
Is divided into a plurality. Heat collecting fins 3 are attached to the heat pipe 2 inside the transformer case 5, and the transformer main body 7 and the heat collecting fins 3 are arranged so as to be immersed in the electric insulating oil 6.

Next, the operation of the above configuration will be described. The heat energy generated by the heat generated by the transformer body 7 is collected by the heat collecting fins 3 through the electric insulating oil 6, and the heat is further radiated by the heat pipe 2. The heat is transmitted to the fins 4 and radiated by natural convection of the air. In this case, natural convection of the air that has taken heat from the radiating fins 4 is promoted in the chimney duct 1, the natural convection speed of the air that cools the radiating fins 4 increases, and the heat radiation efficiency of the radiating fins 4 improves. Furthermore, chimney duct 1
Inside, the partition plates 9 are arranged at equal intervals so that the partition width P is not less than 10% and not more than 70% of the height H of the chimney duct 1 from the upper end of the radiating fin 4, and the inside of the chimney duct 1 is plurally arranged. , The natural convection of the air that has taken heat from the radiating fins 4 is effectively promoted by the chimney duct 1, and more efficient heat radiation becomes possible.

FIG. 7 shows the relationship between the ratio of the partition width 9 of the chimney duct 1 by the partition plate 9 to the height H of the chimney duct 1 from the upper end of the radiation fin 4 and the radiation efficiency. That is,
3 shows the radiation efficiency of the radiation fin 4 when the ratio of the partition width P of the partition plate 9 to the height H of the chimney duct 1 from the upper end of the radiation fin 4 is changed. 7, when the partition width P of the partition plate 9 is less than 10% or more than 70% of the height H of the chimney duct 1 from the upper end of the radiation fin 4, the radiation efficiency of the radiation fin 4 is extremely reduced. ing. Therefore, by setting the partition width P of the partition plate 9 to be 10% or more and 70% or less of the height H of the chimney duct 1 from the upper end of the radiation fin 4, highly efficient heat radiation can be performed.

According to the cooling device configured as described above,
By extending the chimney duct 1 upward from the periphery of the radiating fins 4, natural convection of air that has taken heat from the radiating fins 4 is promoted by the chimney duct 1, and the natural convection speed of the air that cools the radiating fins 4 is increased. The heat radiation fins 4 can be fast, and excellent heat radiation efficiency can be realized without using large heat radiation fins 4.
The radiation efficiency of the radiation fins 4 can be improved while saving resources.

Further, the partition width P of the chimney duct 1 by the partition plate 9 is set to be not less than 10% and not more than 70% of the height H of the chimney duct 1 from the upper end of the radiation fin 4, so that the radiation fin 4
The natural convection speed of the air for cooling the fins is further increased, and the radiating efficiency of the radiating fins 4 can be further improved while saving the resources of the radiating fins 4. Third Embodiment FIGS. 8 and 9 show a third embodiment of the present invention.
This will be described with reference to FIG.

FIG. 8 is a partially cutaway side view of a transformer using the heat pipe cooling device, and FIG. 9 is a plan view of a transformer using the heat pipe cooling device. 8 and 9, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof will be omitted. In addition, it is a pipe-type heater which becomes 10 heating elements. The heat radiation fins 4 are attached to the heat pipe 2 outside the transformer case 5, and the chimney duct 1 extends upward from the periphery of the heat radiation fins 4. Further, inside the chimney duct 1, a heater 10
Is provided. Heat collecting fins 3 are attached to the heat pipe 2 inside the transformer case 5, and the transformer main body 7 and the heat collecting fins 3 are arranged so as to be immersed in the electric insulating oil 6.

Next, the operation of the above configuration will be described. The heat energy generated by the heat generated by the transformer body 7 is collected by the heat collecting fins 3 through the electric insulating oil 6 and further radiated by the heat pipe 2. The heat is transmitted to the fins 4 and radiated by natural convection of the air. In this case, the natural convection of the air that has taken heat from the radiating fins 4 is promoted by the chimney duct 1, the natural convection speed of the air that cools the radiating fins 4 increases, and the heat radiation efficiency of the radiating fins 4 improves. Further, by disposing the heater 10 above the radiating fins 4 in the chimney duct 1, the natural convection of the air that has taken heat from the radiating fins 4 is further promoted by the heater 10, and more efficient heat radiation is possible. Becomes

According to the cooling device configured as described above,
By extending the chimney duct 1 upward from the periphery of the radiating fins 4, natural convection of air that has taken heat from the radiating fins 4 is promoted by the chimney duct 1, and the natural convection speed of the air that cools the radiating fins 4 is increased. The heat radiation fins 4 can be fast, and excellent heat radiation efficiency can be realized without using large heat radiation fins 4.
The radiation efficiency of the radiation fins 4 can be improved while saving resources.

Further, by disposing the heater 10 above the radiating fins 4 in the chimney duct 1, the natural convection speed of the air for cooling the radiating fins 4 is further increased, and the resource of the radiating fins 4 can be saved. The radiating efficiency of the radiating fins 4 can be further improved. In the third embodiment, the example in which the heating element is the pipe-type heater 10 has been described. However, the present invention is not limited to the pipe-type heater 10, and for example, other heaters such as a wire-like nichrome wire may be used. The same effects as above can be obtained.

Further, in the third embodiment, an example is shown in which the heater 10 is mounted above the radiating fins 4 in the chimney duct 1. However, the present invention is not limited to the inside of the chimney duct 1, The same effect as described above can be obtained even if the heater 10 is installed outside the upper part. But heater 1
It is more preferable to attach the heat sink 0 to the inside of the chimney duct 1 because natural convection of the air that has taken heat from the radiating fins 4 is promoted.

Further, in the third embodiment, the example in which the heater 10 is disposed inside the chimney duct 1 has been described. However, even if the upper part of the chimney duct 1 itself is heated, the same effect as described above can be obtained. . In this case, if the chimney duct 1 is divided into an upper part and a lower part, and the space between them is insulated and only the upper part of the chimney duct 1 generates heat, the heat radiation efficiency can be further improved. Fourth Embodiment A fourth embodiment of the present invention will be described with reference to FIGS.

FIG. 10 is a partially cutaway side view of a transformer using the heat pipe cooling device, and FIG. 11 is a plan view of the transformer using the heat pipe cooling device. 10 and 11, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof will be omitted. In addition, 11 is a first heat pipe as a heat transport element, 12 is a first radiating fin, 13 is a second heat pipe as a heat transport element for promoting natural convection of cooling air, and 14 is a natural convection of cooling air. Second radiating fins for promoting the heat radiation.

Heat collecting fins 3 are mounted inside the transformer case 5 of the first heat pipe 11 and the second heat pipe 13, and the transformer body 7 and the heat collecting fins 3 are immersed in the electric insulating oil 6. Has been established. Further, the first heat radiating fins 12 are attached to the first heat pipe 11 outside the transformer case 5, and the chimney duct 1 extends upward from around the first heat radiating fins 12. Further, inside the chimney duct 1 and above the first radiating fins 12, the second heat pipe 1
A plurality of second radiating fins 14 are attached to 3.

Next, the operation of the above configuration will be described. The heat energy generated by the heat generated by the transformer body 7 is collected by the heat collecting fins 3 through the electric insulating oil 6, and the heat is further transferred to the first heat pipe 11. As a result, the heat is transmitted to the first radiating fins 12 and radiated by natural convection of the air. In this case, natural convection of the air that has taken heat from the first radiating fins 12 is promoted by the chimney duct 1, the natural convection speed of the air that cools the first radiating fins 12 increases, and the heat radiation efficiency of the first radiating fins 12 increases. Is improved. Further, a second radiating fin 14 is provided in the chimney duct 1 above the first radiating fin 12, and the transformer main body 7 is provided.
The heat energy generated by the second step
The heat is transferred to the second fin 14 through the heat pipe 13 and
By causing the radiating fins 14 to generate heat, the first radiating fins 1
The natural convection of the air from which the heat has been removed from the second fin is further promoted by the second radiating fins 14, and more efficient heat radiation is possible. Furthermore, in this case, the heat energy inside the transformer is used to promote the natural convection of the air for cooling the first radiating fins 12, so that more efficient heat radiation is possible.

According to the cooling device configured as described above,
By extending the chimney duct 1 upward from the periphery of the first radiating fin 12, natural convection of air that has taken heat from the first radiating fin 12 is promoted by the chimney duct 1 and cools the first radiating fin 12. The natural convection velocity of the air is increased, and excellent heat dissipation efficiency can be realized without using the large first heat dissipation fins 12, and the heat dissipation efficiency of the first heat dissipation fins 12 is improved while saving the resources of the first heat dissipation fins 12. Can be done.

Further, a second radiating fin 14 is provided inside the chimney duct 1 above the first radiating fin 12, and heat energy generated by the transformer body 7 is transferred to the second radiating fin 14 by the second heat pipe 13. , The second radiation fin 14
, The natural convection of the air that has taken heat from the first radiating fins 12 is promoted by the second radiating fins 14, and the natural convection speed of the air that cools the first radiating fins 12 is further increased. The radiation efficiency of the first radiation fins 12 can be further improved while saving the resources of the first radiation fins 12.

In the fourth embodiment, an example is shown in which the second radiating fins 14 are provided inside the chimney duct 1. However, the upper part of the chimney duct 1 is formed by another heat pipe as a heat transport element. Even if heat is generated, the same effect as above can be obtained. In this case, if the chimney duct 1 is divided into an upper part and a lower part, and the space between them is insulated and only the upper part of the chimney duct 1 generates heat, the heat radiation efficiency can be further improved.

Further, in the fourth embodiment, the example in which the second radiating fins 14 are provided inside the chimney duct 1 is shown, but the second radiating fins 1 are provided outside the chimney duct 1 outside.
4, the same effect as described above can be obtained. However, it is more desirable to dispose the second radiating fins 14 inside the chimney duct 1 because natural convection of air that has taken heat from the first radiating fins 12 is promoted.

In each of the first to fourth embodiments,
Although air has been exemplified as a medium for cooling the radiating fins, the present invention is not limited to air. For example, even when cooling is performed by natural convection of another gas such as nitrogen or a liquid such as water, the same effect as described above can be obtained. Can be. Further, in each of the first to fourth embodiments, a cylindrical heat pipe is exemplified as the heat transport element. However, for example, a flat heat pipe, or a pseudo-shrinkage due to evaporation of the working fluid inside the pipe due to heat collection and heat radiation. Pipes and flat elements that transport heat through the pipe, pipes and flat elements that transport heat by circulating the coolant inside the pipe, or pipes and flat elements that transport heat by heat conduction of the pipe. The same effect as described above can be obtained.

In each of the first to fourth embodiments,
An example of a device equipped with a cooling device is an example of a transformer, but it is not limited to a transformer, but it can be applied to a device such as a reactor that has a heating element inside the device case and discharges the heat to the outside. Even when applied, the same effects as above can be obtained.

[0045]

According to the cooling device of the first aspect, the chimney duct is extended upward from the periphery of the radiation fin,
The natural convection velocity of the medium that cools the radiating fins is improved, and without using large radiating fins, it is possible to realize excellent heat radiation efficiency and improve the heat radiation efficiency of the heat radiation fins while saving the resources of the fin material. it can.

According to the cooling device of the second aspect, in addition to the effect of the first aspect, the heat radiation fin is cooled by setting the inner peripheral dimension of the chimney duct to be 100% or more and 120% or less of the external dimension of the heat radiation fin. The natural convection velocity of the medium is further improved, and without using large radiating fins, resource saving of fin material is realized, and more excellent heat radiation efficiency is realized.
The radiation efficiency of the radiation fins can be improved.

According to the cooling device of the third aspect, in addition to the effects of the first or second aspect, the height of the chimney duct from the upper end of the radiation fin is set to 5% or more and 500% or more of the inner peripheral dimension of the chimney duct. By adopting the following, the natural convection velocity of the medium that cools the radiating fins is further improved, and without using large radiating fins, resource saving of the fin material is realized, and superior radiating efficiency is realized. The heat radiation efficiency of the fin can be improved.

According to the cooling device of the fourth aspect, in addition to the effect of the first aspect, the partition plate for dividing the chimney duct into a plurality is provided in the chimney duct, so that the natural convection velocity of the medium for cooling the radiation fins is reduced. While further improving and saving resource of fin materials without using large heat radiation fins,
It is possible to realize more excellent heat radiation efficiency and improve the heat radiation efficiency of the heat radiation fins.

According to the cooling device of the fifth aspect, in addition to the effect of the fourth aspect, the partition width of the chimney duct by the partition plate is reduced.
Since the height of the chimney duct from the upper end of the radiation fin is 10% or more and 70% or less, the natural convection velocity of the medium that cools the radiation fin is further improved, and the fin material can be saved without using a large radiation fin. It is possible to realize more excellent heat dissipation efficiency and improve the heat dissipation efficiency of the heat dissipating fins while conserving resources.

According to the cooling device of the sixth aspect, in addition to the effect of the first aspect, by providing the heating element above the radiating fin in the chimney duct, the natural convection velocity of the medium for cooling the radiating fin is increased. It is possible to further improve the heat dissipation efficiency of the heat dissipation fins without using large heat dissipation fins, thereby realizing more excellent heat dissipation efficiency while saving resources of the fin material.

According to the cooling device of the present invention, the chimney duct extends upward from the periphery of the first radiating fin, and the second radiating fin is provided above the first radiating fin in the chimney duct. The natural convection speed of the medium that cools the radiation fins is further improved, and without using large radiation fins,
It is possible to realize more excellent heat dissipation efficiency and improve the heat dissipation efficiency of the heat dissipation fins while saving resources of the fin material.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a transformer using a heat pipe cooling device according to a first embodiment of the present invention.

FIG. 2 is a plan view of a transformer using the heat pipe cooling device according to the first embodiment of the present invention.

FIG. 3 is a graph showing a relationship between a ratio of an inner peripheral dimension of a chimney duct to an outer dimension of a radiation fin and a radiation efficiency in the first embodiment of the present invention.

FIG. 4 is a graph showing a relationship between a height of a chimney duct from an upper end of a radiation fin and a radiation efficiency according to the first embodiment of the present invention.

FIG. 5 is a partially cutaway side view of a transformer using a heat pipe cooling device according to a second embodiment of the present invention.

FIG. 6 is a plan view of a transformer using a heat pipe cooling device according to a second embodiment of the present invention.

FIG. 7 is a graph showing a relationship between a ratio of a partition width of a chimney duct by a partition plate to a height of a chimney duct from an upper end of a radiation fin and a heat radiation efficiency according to the second embodiment of the present invention.

FIG. 8 is a partially cutaway side view of a transformer using a heat pipe cooling device according to a third embodiment of the present invention.

FIG. 9 is a plan view of a transformer using a heat pipe cooling device according to a third embodiment of the present invention.

FIG. 10 is a partially cutaway side view of a transformer using a heat pipe cooling device according to a fourth embodiment of the present invention.

FIG. 11 is a plan view of a transformer using a heat pipe cooling device according to a fourth embodiment of the present invention.

FIG. 12 is a partially enlarged view of a conventional heat pipe cooling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chimney duct 2 Heat pipe (heat transport element) 3 Heat collecting fin (heat collecting part) 4 Heat radiating fin 5 Transformer case 6 Electrical insulating oil 7 Transformer main body 8 Electrode insulator 9 Partition plate 10 Heater (heating element) 11th Reference Signs List 1 heat pipe (first heat transport element) 12 first heat radiation fin 13 second heat pipe (second heat transport element) 14 second heat radiation fin

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Hirakawa 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5E050 HA09

Claims (7)

[Claims] 1. A cooling system comprising: a heat collecting unit; a radiating fin; a heat transport element configured to transfer heat from the heat collecting unit to the radiating fin; and a chimney duct extending upward from a periphery of the radiating fin. apparatus. 2. The cooling device according to claim 1, wherein an inner peripheral dimension of the chimney duct is 100% or more and 120% or less of an outer dimension of the radiation fin. 3. The cooling device according to claim 1, wherein a height of the chimney duct from an upper end of the heat radiation fin is not less than 5% and not more than 500% of an inner peripheral dimension of the chimney duct. 4. The cooling device according to claim 1, wherein a partition plate for dividing the chimney duct into a plurality is provided in the chimney duct. 5. The cooling device according to claim 4, wherein a partition width of the chimney duct by the partition plate is not less than 10% and not more than 70% of a height of the chimney duct from an upper end of the radiation fin. 6. The cooling device according to claim 1, wherein a heating element is provided above the radiation fin in the chimney duct. 7. A heat collecting portion, a first radiating fin, a first heat transport element for transferring heat from the heat collecting portion to the first radiating fin, and extending upward from a periphery of the first radiating fin. A chimney duct, a second radiating fin provided above the first radiating fin in the chimney duct, and a second heat transport element for transporting heat from the heat collecting portion to the second radiating fin. Cooling system.