JP6203693B2 - Electrical equipment - Google Patents

Description

  The present invention relates to a heat dissipation structure for efficiently dissipating heat from a heat generating component such as a power module included in an electric device such as a power converter, and an electric device including the heat dissipation structure.

  Electrical devices installed outdoors, such as power conversion devices used in solar power generation systems, house electrical components inside a sealed housing in order to prevent intrusion of wind and rain and dust.

  For this reason, it is difficult to adopt a forced air cooling system that introduces outside air in order to eliminate the temperature rise inside the housing due to the heat generating parts that generate heat when supplied with electric power, and the heat of the heat generating parts is A method of conducting to a radiator disposed outside the body is employed (for example, see Patent Document 1).

  In some conventional electric devices, a part of the outer surface of the casing is configured by the outer surface of the radiator, and the heat generating component is attached in direct contact with the inner surface of the radiator inside the casing. The heat generated in the heat-generating component is conducted to the inner surface of the radiator and is radiated from the outer surface of the radiator to the outside of the housing.

JP 2012-164878 A

  However, if the forced air cooling method is not adopted in the electrical equipment installed outdoors, it is necessary to increase the size of the heatsink in order to increase the heat dissipation effect. Becomes extremely small, and the heat generating component comes into contact with a very small range of the radiator. For this reason, the heat of the heat generating component can be conducted only in a limited range between the portion where the heat generating component contacts the heat radiator and the portion above it, and the size of the heat radiator is fully utilized. There is a problem that heat can not be dissipated.

An object of the present invention is to provide an electric device having a heat dissipation structure for a heat generating component that can efficiently conduct heat of the heat generating component to the heat sink even when a large heat sink is used compared to the heat generating component. There is.

Heating unit products heat radiation structure of an electric device of the invention, the radiator, and a heat diffusion member. The radiator has a predetermined range that is larger in the height direction and the width direction than a heat-generating component that generates heat upon receiving power supply. The heat diffusing member is a high heat conductor having a higher thermal conductivity than the radiator, and is larger than the heat generating component in the width direction. The heat generating component is attached to a lower portion of a predetermined range in the radiator through a heat diffusion member.

  When the heat generating component is attached to the lower part of the radiator within a predetermined range, the heat generated in the heat generating component is conducted to the heat diffusing member larger than the heat generating component in the width direction, and then conducted to the heat radiator. In the radiator, the heat of the heat-generating component is conducted not only to the portion facing the heat-generating component and the portion above it, but also to the portion in contact with the heat diffusion member larger than the heat-generating component in the lateral direction and the portion above it, A wider range is used for heat dissipation.

  In this configuration, the heat diffusing member is preferably larger than the heat generating component in the height direction. All the heat of the heat generating component can be conducted to the heat diffusing member.

  The heat diffusion member has a flat plate shape having a first surface and a second surface that are parallel to each other, the back surface of the heat generating component faces the first surface, and the entire second surface faces the radiator. preferable. The back surface of the heat generating component can be brought into surface contact with the first surface of the heat diffusing member directly or through a layer that improves thermal conductivity, and the second surface of the heat diffusing member can be directly or directly improved with a layer that improves thermal conductivity. The surface can be brought into contact with a predetermined range of the radiator. The heat of the heat generating component can be reliably conducted to the heat diffusing member, and the heat of the heat diffusing member can be reliably conducted to the radiator.

  The heat diffusing member includes a first hole portion for mounting the heat-generating component and a second hole portion for mounting to the radiator, and the first hole portion and the second hole portion are in the height direction. Are preferably formed at the same position. In the heat diffusing member that conducts heat along the width direction, it is possible to minimize the range of damage caused by the attachment of the heat generating component and the attachment to the radiator.

  The electrical device of the present invention includes the above-described heat dissipation structure for the heat generating component, as well as the casing, the heat generating component, and the electric component excluding the heat generating component. The electrical component is arranged in a position not overlapping with the position of the heat generating component in a plan view in the housing. The influence of the heat of the heat generating component on other electrical components can be suppressed.

  By disposing at least a part of the electrical component at a position overlapping the heat generating component in the height direction, the housing can be reduced in size.

  The casing can be applied to an electric device installed outdoors by using a hermetic container that houses a heat generating component, an electric component, and a heat dissipation structure of the heat generating component.

  According to this invention, even when a large radiator is used as compared with the heat generating component, the heat of the heat generating component can be efficiently conducted to the heat radiator.

1 is an external view of the inside of a power conversion device to which a heat dissipation structure for a heat generating component according to an embodiment of the present invention is applied. (A) And (B) is the side view and back view of the same power converter device. It is an external view of the principal part of the power converter. (A) And (B) is a figure which shows the heat conduction state of the heat radiator of the same power converter device when not using a heat-diffusion member and when using a heat-diffusion member, respectively. It is a figure which shows the thermal radiation structure of the heat-emitting component which concerns on another embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a power conversion device will be described with reference to the drawings as an electric device to which a heat dissipation structure for a heat generating component according to an embodiment of the present invention is applied.

  As shown in FIG.1 and FIG.2, the power converter device 10 is equipped with the heat radiator 1 in a part of back panel 6 in the state except the front panel which is not shown in figure, the power module 2 on the front side of the heat radiator 1, The coil 3, the coil 4, and the board | substrate 5 are arrange | positioned.

    The back panel 6 includes an opening 61 and an opening 62. The opening 61 is formed at a substantially central portion of the back panel 6. The opening 62 is formed at one corner of the lower portion of the back panel 6. The opening 62 is an opening for drawing an external wiring into the power conversion apparatus 10 and is closed with a sealing plate (not shown) when not in use. A connector unit (not shown) has a peripheral edge attached to the vicinity of the opening 62 on the front surface side of the rear panel 6, and a plurality of external cables are connected to the connector unit.

  The heat radiator 1 is made of, for example, aluminum, and includes a plurality of vertical fins 12 on the back surface of a rectangular flat plate-like main body 11 with a certain distance between them to extend to the back surface side. ing. The main body 11 is formed to be slightly larger than the opening 61, and is attached with the peripheral edge of the front surface in close contact with the periphery of the opening 61 on the back surface of the back panel 6. Sealing between the front surface of the radiator 1 and the periphery of the opening 61 is ensured by, for example, waterproof packing. The range excluding the peripheral edge on the front surface of the radiator 1 corresponds to the predetermined range of the present invention, and is exposed on the front side of the rear panel 6.

  The power module 2 is a heat-generating component of the present invention that generates heat when supplied with electric power, and is attached to the lower part of the front surface of the radiator 1. The coil 3 and the coil 4 are attached to the upper part of the front surface of the radiator 1.

  The substrate 5 has a plurality of electrical components mounted thereon. The substrate 5 is fixed to the rear panel 6 with a space between the front surface of the power module 2 via the spacer 51.

  As an example, the power conversion device 10 is installed such that the front surface of the main body 11 of the radiator 1 is substantially vertical. The heat generating component of the present invention is not limited to the power module 2 on condition that heat to be radiated through the radiator 1 is generated by supplying power.

  As shown in FIG. 3, the power module 2 is attached to the lower part of the predetermined range in the front surface of the main body 11 of the radiator 1 through the heat pipe 7 which is a heat diffusion member of the present invention. The heat pipe 7 is a belt-like body that is longer than the power module 2 in the lateral direction. Spaces that are continuous in the horizontal direction are formed in layers in the vertical direction inside the heat pipe 7, and each space is filled with a fluid having high thermal conductivity. The heat conductivity of the heat pipe 7 is higher than the heat conductivity of the radiator 1, and conducts heat on the high temperature side to the low temperature side in the lateral direction.

  The power module 2 is fixed to the front surface of the heat pipe 7, which is the first surface of the present invention, with the entire rear surface facing each other. The heat pipe 7 is fixed to the front surface of the main body 11 of the radiator 1 with the entire rear surface being the second surface of the present invention facing each other. The back surface of the power module 2 is formed in a flat surface and can be brought into surface contact with the first surface of the belt-shaped heat pipe 7. The front surface of the main body 11 of the radiator 1 is formed into a flat surface, and the second surface of the belt-shaped heat pipe 7 can come into surface contact.

  Most of the heat generated in the power module 2 is conducted laterally from the first surface of the heat pipe 7 through the heat pipe 7 to raise the temperature of the entire heat pipe 7, and then from the second surface of the heat pipe 7. The heat is conducted to the front surface of the main body 11 of the radiator 1 and is radiated to the back side of the back panel 6 by the fins 12. Further, as shown in FIG. 2A, since the substrate 5 is arranged so as not to overlap with the power module 2 in plan view, the electrical components mounted on the substrate 5 are affected by the heat generated in the power module 2. It is difficult to receive. Moreover, since the board | substrate 5 is arrange | positioned in the state which one part overlaps with the position of the power module 2 about the height direction, the power converter device 10 can be comprised small.

  Here, “does not overlap in a plan view” means that they do not overlap when viewed from the direction of the arrow X in FIG. 2A, and “does overlap in the height direction” in FIG. 2A. It means that both overlap when viewed from the direction of arrow Y.

  The coil 3 and the coil 4 also generate heat due to the supply of electric power. However, the heat generated in the coil 3 and the coil 4 is conducted to the upper part of the main body 11 of the radiator 1, so that other components (the power module 2 and the substrate 5 are connected). Etc.) is less affected. Further, the heat diffusion member of the present invention is not limited to the heat pipe 7 on the condition that the heat conductivity is higher than the heat conductivity of the radiator 1.

  In the radiator 1, the heat conduction in the upward direction is dominant, and the amount of heat conducted in the lateral direction is smaller than the amount of heat conducted in the upward direction. For this reason, as shown in FIG. 4A, when the power module 2 is directly fixed to the lower part of the main body 11 of the radiator 1 having a sufficiently wide width compared to the lateral length of the power module 2, The wide portion in the horizontal direction 11 does not contribute to heat dissipation, and the heat of the power module 2 cannot be sufficiently dissipated.

  On the other hand, as shown in FIG. 4B, when the power module 2 is fixed to the lower portion of the main body 11 via the heat pipe 7 longer than the power module 2 in the lateral direction, the heat of the power module 2 is laterally transmitted. It can be made to conduct to the main body 11 in the expanded state. Accordingly, the heat of the power module 2 can be efficiently radiated using a wide range in the lateral direction of the main body 11. Moreover, the heat radiator 1 can be made small by improving heat dissipation efficiency.

When the height (width) of the heat pipe 7 is lower (smaller) than the height (width) of the power module 2, the power module 2 contacts the heat pipe 7 only at a part of the back surface in the height direction. become. When the height (width) of the heat pipe 7 is higher than the height (width) of the power module 2, a portion of the heat pipe 7 where the back surface of the power module 2 does not contact in the height direction is wasted. By making the height (width) of the heat pipe 7 substantially equal to the height (width) of the power module 2, the heat of the power module 2 can be most efficiently conducted to the heat pipe 7. By making the length of the heat pipe 7 equal to the length of the main body 11 of the radiator 1 in the lateral direction, the heat of the power module 2 can be more efficiently conducted to the radiator 1 through the heat pipe 7. .

  As shown in FIG. 5A, when the power module 2 and the heat pipe 7 are attached to the front surface of the main body 11 of the radiator 1, when the hole is formed in the heat pipe 7, the power module in the height direction. The mounting hole (first hole) for the second heat pipe 7 and the mounting hole (second hole) for the heat radiator 7 of the heat pipe 7 should be at the same position.

  As described above, the space that is continuous in the horizontal direction is formed in the vertical direction in the heat pipe 7, and each space is filled with a fluid having high thermal conductivity. For this reason, when a hole is formed in the heat pipe 7, the fluid leaks from the hole, and the function of heat conduction is lost for the layer where the fluid leaks. Here, when the power module 2 and the heat pipe 7 are fixed to the radiator 1 through fixing members such as pins or screws that pass through the heat pipe 7, the through position of the fixing member in the heat pipe 7 is set in the height direction (up and down). If the directions are matched, the fluid leakage can be limited to only a part of the layers, and the space that does not function for heat conduction in the heat pipe 7 can be minimized.

Further, a heat conduction improving layer 21 and a heat conduction improvement are provided between the power module 2 and the heat pipe 7 and / or between the heat pipe 7 and the main body 11 so as to improve the heat conductivity by the heat radiating sheet or the heat radiating grease. Layer 71 can also be formed. The entire back surface of the power module 2 is in surface contact with the first surface of the heat pipe 11 via the heat conduction enhancement layer 21, and the second surface of the heat pipe 7 is entirely covered with the heat conduction enhancement layer 71. Make surface contact with the front. Although there are microscopic irregularities on the back surface of the power module 2, the first and second surfaces of the heat pipe 7, and the front surface of the main body 11, the heat conduction improvement layer 21 and the heat conduction improvement have flexibility. Unevenness can be eliminated by the layer 71, and the contact area of the power module 2, the heat pipe 7, and the main body 11 can be maximized to improve the thermal conductivity. Whether or not a heat radiating sheet or heat radiating grease is used, the power module 2 and the heat pipe 7 are thermally in surface contact.

  As shown in FIG. 5B, when the thickness of the main body 11 of the radiator 1 is sufficiently thick, the heat pipe 7 is arranged so as to be in continuous contact from the front surface of the main body 11 to the left and right side surfaces. A large amount of heat can be conducted from the pipe 7 by the radiator 1. The heat of the power module 2 can be radiated more efficiently from the radiator 1 via the heat pipe 7.

  In the above description, the power conversion device has been described as an example. However, the heat dissipation structure for a heat generating component according to the present invention can be similarly applied to other electrical devices.

  In addition, the present invention is not limited to the case where the main body 11 has the flat radiator 1 disposed substantially vertically, but has a predetermined range larger than the heat generating component in the width direction, and mainly conducts heat of the heat generating component upward. If it is a heat radiator, it can be similarly applied to a heat radiator whose predetermined range is constituted by an inclined surface, a bent surface or a curved surface.

10-Power converter (electric equipment)
1- Heatsink 2-Power module (Heat generation component)
5-substrate 7-heat pipe (heat diffusion member)

Claims (2)

The entire bottom surface of the heat-generating component that generates heat when receiving power supply is in thermal contact with the heat-generating component, and is composed of a strip-shaped high thermal conductor that is longer in the lateral direction than the heat-generating component. from the high temperature side have a heat diffusion member which Ru is conducted to the band direction to the cold side that is not in thermal contact,
A radiator including a front surface in which the entire bottom surface of the heat diffusing member is in thermal surface contact and a plurality of longitudinal radiation fins formed on the opposite side;
A panel to which the radiator is attached so that the plurality of longitudinal fins are vertically arranged , and
The radiator is larger than the heat diffusion member,
The heat diffusing member is disposed laterally below the radiator,
The radiator is an electrical device that conducts heat conducted from the heat-generating component in the belt-like direction of the heat diffusing member to the radiation fins and dissipates heat with the plurality of vertical radiation fins . The thermal diffusion member includes a first hole portion for mounting said heat generating component, and a second hole for attachment to the radiator, the first hole and the second hole portion the electrical apparatus according to claim 1 which is formed in the same position.

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