JP2009123917A - Radiator and transformer attached with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiator which improves overall cooling efficiency by equalizing the cooling efficiency of respective corrugations of a corrugated fin, and to provide a transformer attached with the same. <P>SOLUTION: The corrugated fin 3a is so configured that the cooling area of each of the corrugations 4a to 4m of the corrugated fin 3a becomes smaller as each of the corrugations 4a to 4m goes further away from an inflow entrance 5. As a result, the cooling area of the corrugation 4a having larger cooling efficiency becomes large, while the cooling area of the corrugation 4m having smaller cooling efficiency becomes small. Cooling efficiency taking the area into consideration is thus given as cooling efficiency more equalized than cooling efficiency in a case of a constant cooling area. As a result, a waste of a metal material is prevented to improve the cooling efficiency of the radiator as a whole. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radiator including a plurality of heat sinks and a transformer to which the radiator is attached.

  Conventionally, an iron core or coil is a heating element in a transformer, and in order to cool this, the generated heat is received by a cooling medium such as insulating oil or gas, and the cooling medium is circulated through a path through the radiator. And heat is released to the atmosphere with a radiator. A schematic of a conventional transformer is shown in FIG. FIG. 5A is a plan view, and FIG. 5B is a view taken along the line BB in FIG. As shown in FIG. 5, the transformer 10 is provided with a radiator 13 in such a manner that it is connected to a transformer container 11 containing an iron core and a coil, and the cooling medium received in the transformer container 11 is Then, after flowing into the radiator 13 through the inflow connection pipe 12, the heat is radiated and cooled by the radiator 13, and then flows out from the radiator 13 through the outflow connection pipe 12 so that it can be circulated into the transformer container 11. (See Patent Document 1).

  An example of a radiator for a transformer is shown in FIGS. FIG. 3 is a perspective view of a corrugated fin-type radiator used in an oil-filled transformer, and FIG. 4 is an exploded view of the component.

  As shown in FIGS. 3 and 4, the conventional radiator has a pair of left and right pipes connected to the upper pipe 1c and the lower pipe 2c in which the inlet 5 and the outlet 6 are formed, respectively, and the upper pipe 1c and the lower pipe 2c. Corrugated fins 3c and 3c are provided. Each corrugated fin 3c is composed of a plurality of waves 4o, which are heat sinks formed by forming a steel plate so that the cross-section is corrugated and welding the upper and lower end surfaces to be hollow. Each of the upper pipe 1c and the lower pipe 2c is formed at an inlet 5 or an outlet 6 of insulating oil, which is a cooling medium, and the other end is an upper closing plate 7 or a lower closing plate 8 respectively. It is blocked. Moreover, the side surface and the lower surface are opened in the upper pipe 1c, and the side surface and the upper surface are opened in the lower pipe 2c.

  The corrugated fins 3c and 3c are disposed on the side surfaces of the pipes 1c and 2c so as to sandwich the upper pipe 1c and the lower pipe 2c. A corrugated fin closing plate 9 is disposed in the space between the upper pipe 1c and the lower pipe 2c. The corrugated fin closing plate 9 is a box-shaped member that is open at the front and the rear but whose periphery is formed by a wall plate. The corrugated fin closing plate 9 has upper and lower wall surfaces covering the lower surface of the upper pipe 1c and the upper surface of the lower pipe 2c, respectively, and the left and right wall surfaces leave the upper and lower parts of the corrugated fins 3c and 3c facing each other, and the middle portion is covered. Covering. Since the upper pipe 1c, the lower pipe 2c, and the corrugated fins 3c and 3c are attached in a sealed state around the corrugated fin closing plate 9, the insulating oil as a cooling medium does not leak to the outside from the press contact portion. I have to.

  With the above structure, the openings formed on the side surfaces of the upper pipe 1c and the lower pipe 2c are arranged so as to face the upper and lower parts of the corrugated fins 3c and 3c, respectively. The slits 4 s and 4 s are connected so that the insulating oil flows between an upper portion or a lower portion that is not covered by the corrugated fin closing plate 9.

  The inflow port 5 and the outflow port 6 are connected to a side surface of a transformer container that houses a coil, an iron core, and the like. The insulating oil filled in the radiator flows into the transformer from the lower pipe 2c through the outlet 6 and is heated by a coil, an iron core or the like as a heat source, thereby cooling the transformer. The heated insulating oil expands and has a reduced specific gravity, and flows into the radiator through the inflow port 5. In the radiator, the insulating oil that has flowed into the corrugated fins 3c from the upper pipe 1c is cooled by outside air, increases in specific gravity, moves downward, passes through the lower pipe 2c, and returns to the container that stores the coil, iron core, etc. again. It is circulated by.

  However, the amount of oil per hour flowing into each wave 4o of the corrugated fin 3c from the upper pipe 1c is more affected by the flow resistance as it flows through the upper pipe 1c longer, and therefore decreases as it moves away from the inlet 5 due to the diversion. The amount of heat radiation decreases as the distance from the inlet 5 increases. Therefore, although the cooling efficiency of each wave 4o is biased, the cooling area of each wave 4o is constant, so that the cooling performance of the wave 4o far from the inlet 5 is not fully utilized, and as a result, the entire radiator is cooled. There was a problem that the efficiency was lowered.

  Further, the insulating oil is cooled and increases in specific gravity as it flows in the upper pipe 1c and the lower pipe 2c, and tends to move downward, but the upper pipe 1c and the lower pipe 2c are arranged to be horizontal. The flow resistance is large and the flow is not smooth. Therefore, the amount of oil per hour flowing through the radiator is reduced, and the cooling efficiency of the entire radiator is lowered.

In the transformer disclosed in Patent Document 1, the radiator attached to the outside of the container includes a pipe for guiding a cooling medium in the container body and a plurality of hollow panels, and the plurality of hollow panels are attached to the pipe. A structure is adopted in which the area is varied depending on the position, that is, the area is increased as the position is closer to the connection position with the container.
JP 11-3822 (paragraphs 0014 to 0015, 0020; FIG. 3)

  Therefore, regarding a radiator having a plurality of radiator plates and a pipe for guiding a cooling medium to each radiator plate, by equalizing the cooling efficiency of each radiator plate, the radiator as a whole or as a transformer provided with it There is a problem to be solved in terms of improving the cooling efficiency.

  The object of the present invention is to solve the problems of the prior art, and by improving the cooling efficiency of the entire radiator by leveling the cooling efficiency of each heat sink, the amount of material used for the heat sink and the use of the cooling medium It is to provide a radiator that can reduce the amount, reduce the weight, and reduce the cost, or a transformer provided with the radiator.

  In order to achieve the above object, a radiator according to the present invention includes a plurality of heat sinks and a pipe for guiding a cooling medium to each of the heat sinks, and the heat sinks are combined with heat sinks having different areas. . By changing the area of the heat radiating plate according to the cooling efficiency of each heat radiating plate, the cooling efficiency of any heat radiating plate is equalized, and the cooling efficiency of the entire radiator can be improved.

  In addition, the radiator according to the present invention includes a plurality of heat radiating plates and pipes for introducing a cooling medium to the respective heat radiating boards, and the pipes are provided with a gradient. By providing a gradient to the piping so that the flow resistance becomes small, the variation in the oil amount per hour flowing through which radiator plate of the radiator will be reduced, and the cooling efficiency of any radiator plate will be equalized. The cooling efficiency can be improved.

  The radiator according to the present invention includes a plurality of heat radiating plates and pipes for guiding a cooling medium to each of the heat radiating plates, wherein the heat radiating plates are formed by combining heat radiating plates having different areas, and the pipes are provided with a gradient. Features. By making the areas of the heat sinks different and providing a gradient to the piping, the cooling efficiency of each heat sink can be more easily leveled, and the cooling efficiency of the entire radiator can be further improved.

  Furthermore, a transformer according to the present invention is a transformer provided with the above-described radiator, and is connected to a transformer container containing an iron core and a coil for exciting the iron core via a connection pipe, and the cooling A medium circulates between the radiator and the radiator through the connection pipe.

  According to the radiator and the transformer of the present invention, the cooling efficiency of the radiator can be improved as compared with the conventional one. Therefore, if the temperature of the cooling medium is the same, the cooling area of the entire radiator can be reduced. Thereby, since the material usage-amount of a heat sink and the usage-amount of a cooling medium can be reduced, it becomes possible to aim at the weight reduction and cost reduction of a radiator or a transformer.

  Hereinafter, with reference to the drawings, an embodiment of a radiator according to the present invention and a transformer provided with the same will be described. Since the connection between the radiator and the transformer container may be the same as the conventional structure described with reference to FIG.

  FIG. 1 shows a first embodiment of a radiator according to the present invention. FIG. 1A is a plan view of the radiator according to the first embodiment, FIG. 1B is a front view thereof, and FIG. 1C is a side view thereof. Since the aspect of attaching the radiator to the transformer container may be the same as the conventional case, the description thereof will be omitted.

  According to the radiator shown in FIG. 1, the corrugated fins 3 a are arranged such that the waves 4 a to 4 m of the heat radiating plate are assembled to the upper pipe 1 a sequentially from the inlet 5 side, and the height (the upper part of the waves 4 a to 4 m) The projecting length from the pipe 1a to the side) is configured to be lower as the wave moves away from the inlet 5. That is, when the height of the wave 4a closest to the inflow port 5 is h1, and the height of the wave 4m farthest from the inflow port 5 is h2, h1> h2. As can be seen from the front view (b) and the side view (c), the heat plate waves 4a to 4m are the thickness of each heat sink (the width of the space through which the cooling medium flows), between the upper pipe 1a and the lower pipe 1b. Therefore, the cooling area of the waves 4a to 4m decreases as the distance from the inflow port 5 increases. As a result, the cooling area of the wave 4a, which is said to have a large cooling efficiency, is large, the cooling area of the wave 4m, which is said to have a low cooling efficiency, is reduced, and the cooling efficiency in consideration of the area is leveled. As a result, the cooling efficiency of the entire radiator can be improved.

  In the radiator shown in FIG. 1, in order to change the cooling area, the heights of the waves 4a to 4m are uniformly reduced from the inflow port 5 toward the end portion. You can also. Further, the height in the upward direction may be changed in a manner that decreases in a sequential or stepwise manner within the allowable range for connection with the piping, and further, the shape of each wave is changed to a trapezoid or the like. The cooling area may be changed.

  A second embodiment of the radiator according to the present invention is shown in FIG. FIG. 2A is a plan view of a radiator according to the second embodiment, FIG. 2B is a front view thereof, and FIG. 2C is a side view thereof. Since the aspect of attaching the radiator to the transformer container may be the same as the conventional case, the description thereof will be omitted.

  According to the radiator shown in FIG. 2, the upper pipe 1b and the lower pipe 2b are arranged with a gradient. Specifically, the upper wall and the lower wall of the corrugated fin closing plate 9 are formed as inclined walls, and the pipes 1b and 2b are arranged in a gradient arrangement by attaching the upper pipe 1b and the lower pipe 2b to these inclined walls. Is done. As a result, the cooling medium (insulating oil) flowing into the radiator flows down in the upper pipe 1b, and the cooling medium sequentially flows from the upper pipe 1b into the waves 4n that are the heat radiating plates. The cooled medium sequentially joins the lower pipe 2b, flows down in the lower pipe 2b, and flows out from the outlet 6. In this way, by providing gradients in the upper pipe 1b and the lower pipe 2b, even if there is a flow path resistance in the pipe, the flow down is promoted by gravity, and from each wave 4n to each wave 4n. The flow of air becomes uniform, and the cooling efficiency of each heat sink is equalized. Further, since the flow in each wave 4n is made uniform, the amount of oil per hour flowing through the radiator is increased as compared with the conventional one, and as a result, the cooling efficiency of the entire radiator can be improved.

  As described above, in the radiator according to the present invention, the cooling efficiency of each heat radiating plate is made uniform, and the cooling efficiency is improved. In addition, although Example 1 and Example 2 were distinguished and demonstrated above, embodiment of this invention may have the structure of Example 1 and the structure of Example 2 together. In this case, the measures to give a gradient to the piping increase the cooling efficiency without reducing the area of each wave that is at a distance from the inlet 5, so the area change when only the measures to change the cooling area are adopted The amount can be reduced. In addition, about the heat sink farthest from the inflow port 5 or the outflow port 6, since there is no heat sink on the back side and the heat dissipation efficiency to the atmosphere is good, the area is made larger than the heat sink in front of it. Good.

  Although the present invention has been described as a radiator attached to a transformer, it can also be configured as a transformer attached with a radiator, and further, a cooling medium can be used not only between the transformer but also an electric device that generates heat. It can also be provided as a radiator that cools the electrical equipment by circulating it.

1 is an explanatory view of a first embodiment of a radiator according to the present invention. FIG. Explanatory drawing of Example 2 of the radiator by this invention. The perspective view of the conventional corrugated fin radiator. The component exploded view of the conventional corrugated fin radiator. Schematic which shows the conventional transformer with which the radiator was attached.

Explanation of symbols

1a, 1b, 1c ... upper pipe 2a, 2b, 2c ... lower pipes 3a, 3b, 3c ... corrugated fins 4a to 4o ... wave 5 ... inlet 6 ... outlet 7 ... Upper closing plate 8 ... Lower closing plate 9 ... Wavy fin closing plate 10 ... Transformer 11 ... Transformer container 12 ... Connection pipe 13 ... Radiator

Claims (10)

  A radiator comprising a plurality of heat radiating plates and a pipe for guiding a cooling medium to each of the heat radiating plates, wherein the heat radiating plates are combined with heat radiating plates having different areas.   2. The radiator according to claim 1, wherein the pipe is a straight pipe, and the area of the heat radiating plate is different by changing an overhanging width or a height that projects to a side of the pipe. .   The pipe is composed of an inflow pipe provided with an inflow port and an outflow pipe provided with an outflow port, and the inflow port and the outflow port are arranged on the same side of the radiator, The area of the heat radiating plate is reduced sequentially or stepwise as the distance from the inflow port and the outflow port of the inflow pipe and the outflow pipe is increased. Radiator.   A radiator comprising a plurality of heat sinks and pipes for introducing a cooling medium to each of the heat sinks, wherein the pipes are provided with a gradient.   The radiator according to claim 4, wherein the pipe is a straight pipe, and the gradient of the pipe is provided in a direction in which the cooling medium flowing in and the cooling medium flowing out flow down.   The pipe is composed of an inflow pipe provided with the inflow port and an outflow pipe provided with the outflow port. The inflow port and the outflow port are opened on the same side of the radiator. The radiator according to claim 4, wherein the inflow pipe has a downward slope from the inlet, and the outflow pipe has a downward slope toward the outlet.   A radiator comprising a plurality of heat sinks and pipes for introducing a cooling medium to each of the heat sinks, wherein the heat sinks are formed by combining heat sinks having different areas, and the pipes are provided with a gradient.   The pipe is a straight pipe, and the area of the heat radiating plate is different by changing an overhanging width or height projecting to the side of the pipe, and the gradient of the pipe flows into the pipe. The radiator according to claim 7, wherein the cooling medium and the cooling medium flowing out are attached in a flowing-down direction.   The pipe is composed of an inflow pipe provided with the inflow port and an outflow pipe provided with the outflow port. The inflow port and the outflow port are opened on the same side of the radiator. The area of the heat radiating plate is decreased sequentially or stepwise as it moves away from the inlet and the outlet of the inflow pipe and the outflow pipe. The radiator according to claim 7, wherein the outlet pipe has a downward slope toward the outlet.   A transformer provided with the radiator according to any one of claims 1 to 9, wherein the transformer is connected to a transformer container containing an iron core and a coil for exciting the iron core via a connection pipe, A transformer characterized in that a cooling medium circulates between the transformer container and the radiator through the connection pipe.

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