JP5847310B2 - Heat sink and inverter - Google Patents

Description

  The present invention relates to a heat sink and a power conditioner including the heat sink.

  In a power conditioner that converts electric power generated by a solar cell module into electric power that can be used at home, a heat sink is often used to air-cool internal heating elements. Various devices have been devised in order to reduce the size of the inverter, such as the arrangement of components inside the inverter. Therefore, the conventional power conditioner is configured to reduce the size of the power conditioner while suppressing a decrease in cooling performance, for example, by configuring the heat sink with a plurality of heat radiators.

  For example, the cooling structure shown in Patent Document 1 below includes a first heat radiating body on which electrical components are mounted, a second heat radiating body joined to the first heat radiating body, and a joint between these heat radiating bodies. It is comprised from the sealing material provided and the fastening member which fastens these heat radiators. Moreover, as a prior art represented by the following patent document 1, for example, a first heat radiator, a second heat radiator, one end is connected to the first heat radiator by a fastening member, and the other end is a fastening member. Some of them are composed of a metal member connected to the second radiator.

Japanese Patent Laying-Open No. 2007-294806 (FIG. 4)

  A power conditioner installed outdoors is configured to introduce outside air from an outside air introduction port using a forced air cooling fan, and to allow the outside air to flow through a heat sink and then exhaust the air from the exhaust port. Therefore, there is a risk that rainwater may enter the power conditioner from an exhaust port or the like. In order to prevent the heat generating elements inside the power conditioner from being adversely affected by rainwater, it is necessary to apply the sealing material as described above to the joints (joints) of the plurality of radiators. In the above prior art, in order to ensure the waterproof property of the power conditioner, not only the operation of applying a sealing material to the coupling part in the production process is required, but also the coupling part needs to be closely attached with a fastening member such as a screw. is there. However, when such a sealing material is applied, an extra time and cost in the assembly work are generated as compared with the case where the sealing material is not provided. Furthermore, since the sealing material deteriorates due to the heat of the power conditioner or the like, sufficient waterproofness cannot be obtained by using the power conditioner for a long time. As described above, in the conventional technique represented by Patent Document 1 described above, there is a problem in that it is not possible to meet the need for further reducing the cost while suppressing a decrease in waterproof performance at a joint portion of a plurality of radiators. was there.

  The present invention has been made in view of the above, and obtains a heat sink and a power conditioner capable of further reducing the cost while suppressing a decrease in waterproof performance at a coupling portion of a plurality of radiators. For the purpose.

  In order to solve the above-described problems and achieve the object, the present invention is a heat sink formed by combining a plurality of heat radiators, and one of the heat radiators has a protruding shape toward the other heat radiator side. The ant tenon-like convex part provided in the above-mentioned is formed, and the other heat sink is formed with a dovetail-shaped concave part that fits into the convex part, and the convex part is an end part facing the concave part. The concave portion has a cross-sectional trapezoid shape in which the width of the bottom portion of the concave portion is larger than the opening portion of the concave portion. And one said heat radiator and another said heat radiator are couple | bonded integrally in the state which the said convex part fitted to the said recessed part.

  According to this invention, the ant tenon-like convex part formed in one radiator is fitted to the dovetail-shaped concave part formed in the other radiator, so that the projection from the mating surface of the convex part and the concave part Since the intrusion of water is prevented, there is an effect that the cost can be further reduced while suppressing the deterioration of the waterproof performance at the joint portion of the plurality of radiators.

FIG. 1 is an external perspective view of a power conditioner according to an embodiment of the present invention. FIG. 2 is a side sectional view of the power conditioner. FIG. 3 is a front sectional view of the power conditioner. 4 is a view taken along the line AA in FIG. FIG. 5 is a diagram illustrating each heat radiating body viewed from the arrow A side in FIG. 4. FIG. 6 is a diagram illustrating a state in which each heat radiator is assembled. FIG. 7 is a diagram illustrating a first modification of each radiator. FIG. 8 is a diagram illustrating a second modification of each radiator. FIG. 9 is an enlarged view of a main part of each radiator before assembly. FIG. 10 is an enlarged view of a main part of each radiator after being assembled. FIG. 11 is a diagram for explaining a conventional cooling structure in which a sealing material is used for the mating surfaces of two radiators. FIG. 12 is a view for explaining a conventional cooling structure in which two radiators are connected by a metal member.

  Hereinafter, embodiments of a heat sink and a power conditioner according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
1 is an external perspective view of a power conditioner according to an embodiment of the present invention, FIG. 2 is a side sectional view of the power conditioner, and FIG. 3 is a front sectional view of the power conditioner. The casing 1 of the power conditioner 100 is provided on the side of the blower chamber 8 through a heating element 5 (such as an IGBT or a reactor) that constitutes an orthogonal transformation circuit, a blower chamber 8 through which outside air flows, and a partition plate 7. A heat sink 4 that cools the heat generating element 5, an outside air intake port 3 provided on the lower surface 1 c of the housing 1, a fan 6 that forcibly takes outside air into the blower chamber 8, and an upper side of the housing 1. And an exhaust port 2 provided on the side surface 1b for exhausting air inside the housing 1.

  Although not shown in the present embodiment, the casing 1 includes a booster for boosting the power generation voltage of the solar cell, an inverter unit for converting direct current boosted by the booster to alternating current, and an inverter. A filter unit that prepares an AC waveform from the unit and outputs it to a commercial system, a control circuit for controlling the fan motor of the fan 6, and the like are also mounted. In the present embodiment, as an example, two exhaust ports 2 are formed on the side surface 1b of the housing 1 and one outside air intake port 3 is provided on the lower surface 1c of the housing 1. The number of outside air intake ports 3 is not limited to these.

  4 is a view taken along the line AA in FIG. 3, and FIG. 4 shows a state before the plurality of heat radiators 4-1 and 4-2 constituting the heat sink 4 are assembled. The radiator 4-1 is provided on the base 4a1 installed in parallel with the partition plate 7 on the surface of the partition plate 7 on the side of the air blowing chamber 8, and on the partition plate side surface 4c1 of the base 4a1 and protrudes toward the partition plate 7 side. And a plurality of fins 4b1 provided on the side surface and a dovetail-like convex portion 40 provided on the side surface 4d1 of the non-partition plate.

  The end portion 4e1 of the radiator 4-1 is, for example, bent at a right angle to the partition plate 7 side, then parallel to the partition plate 7 at the position on the partition plate 7 side from the tip of the fin 4b1, and opposite to the fin 4b1 side. It is formed to bend to the side. A fastening member 9 is inserted into the end 4 e 1, and the fastening member 9 is screwed into the partition plate 7, whereby the heat radiating body 4-1 is fixed to the partition plate 7. In addition, although illustration is abbreviate | omitted in FIG. 4, the heat generating element 5 shown by FIG. 2 is connected to the edge part 4e1 of the thermal radiation body 4-1. As a result, the heat generated in the heating element 5 is absorbed by the base 4a1.

  The radiator 4-2 is provided on the base plate 4a2 installed in parallel with the partition plate 7 on the surface of the partition plate 7 on the air blowing chamber 8 side, and is provided on the partition plate side surface 4c2 of the base portion 4a2 so as to project toward the partition plate 7 side. And a plurality of fins 4b2 provided on the end 4e2 of the base 4a2 and a dovetail recess 41 that fits with the protrusion 40. The end 4e2 of the base 4a2 is formed so as to be bent at a right angle toward the partition plate 7, for example. The end surface 4f of the end portion 4e2 is formed so as to come into contact with the non-partition plate side surface 4d1 of the base portion 4a1 when the concave portion 41 is fitted to the convex portion 40. The tips of the fins 4b2 are formed such that their tips are located closer to the partition plate 7 than the ends 4e2 and the tips of the fins 4b2 do not come into contact with the partition plate 7 when the recesses 41 are fitted to the projections 40. ing.

  In the heat sink 4 thus formed, the heat from the heat generating element 5 is transmitted to the end 4e1 of the radiator 4-1, and the heat transmitted to the end 4e1 is radiated from the fins 4b1 and 4b2. Since air flows through the fins 4b1 and 4b2 as shown by the solid lines in FIG. 3, heat is radiated by the fins 4b1 and 4b2 by the air, and the heating elements 5 are effectively cooled.

  FIG. 5 is a diagram illustrating the radiators 4-1 and 4-2 as viewed from the arrow A side in FIG. 4, and FIG. 6 is a diagram illustrating a state in which the radiators 4-1 and 4-2 are assembled. It is. In FIG. 5, for example, two heat radiating bodies 4-1 are attached to the partition plate 7 (see FIG. 2) on the air blowing chamber 8 side. Each heat radiating body 4-1 is installed so that the convex part 40 may be located on the extension line of the recessed part 41 formed in the heat radiating body 4-2. The recess 41 of the radiator 4-2 extends, for example, linearly in the longitudinal direction (vertical direction in FIG. 5) of the radiator 4-2. Similarly, the convex part 40 of the heat radiating body 4-1 extends linearly in the longitudinal direction of the heat radiating body 4-1. When the radiator 4-2 is moved in the direction of the arrow in FIG. 5, the convex portion 40 is inserted by sliding with respect to the concave portion 41, and the convex portion 40 engages with the concave portion 41. As a result, as shown in FIG. 6, the radiators 4-1 and 4-2 are connected to each other.

  In addition, the shape of each heat radiator 4-1 and 4-2 shown by FIG. 4 and FIG. 6 is a shape for convenience for demonstrating the difference with the prior art mentioned later, and is the following shapes. Also good.

  FIG. 7 is a diagram illustrating a first modification of each radiator. The end 4e3 of the heat radiating body 4-1 shown in FIG. 7 is bent at a right angle to the side opposite to the partition plate 7, and a dovetail-like convex part 40 is formed at the tip. Further, in the heat dissipating body 4-2 shown in FIG. 7, a dovetail recess 41 is formed on the side surface 4c2 of the base plate 4a2.

  FIG. 8 is a diagram illustrating a second modification of each radiator. In the radiator 4-1 shown in FIG. 8, a plurality of fins 4b1 are formed on the side surface 4d1 of the base part 4a1, and a dovetail-like convex part 40 is formed on the side surface 4d1 of the counterpartition plate. .

  FIG. 9 is an enlarged view of main parts of the radiators 4-1 and 4-2 before being assembled, and FIG. 10 is an enlarged view of essential parts of the radiators 4-1 and 4-2 after being assembled. It is. The recess 41 is formed so that the width C1 of the bottom 41b is larger than the width A1 of the opening 41a, and the angle formed between the side surface 41c of the recess 41 and the bottom 41b is an acute angle. That is, the recess 41 has a dovetail groove shape having a trapezoidal cross section (inverted C shape) whose groove width extends from the opening 41a toward the bottom 41b.

  The convex portion 40 is formed such that the width C2 of the end portion 40a facing the concave portion 41 is larger than the width A2 of the base portion 40b, and the outer peripheral surface (non-partition plate side surface 4d1) of the radiator 4-1 and the side surface of the convex portion 40. The angle formed by 40c is an acute angle. That is, the convex portion 40 has a dovetail tenon shape with a trapezoidal cross section (inverted C shape) whose width increases from the base portion 40b toward the end portion 40a.

In the heat sink 4 according to the present embodiment, the relationship among the widths A1, A2, C1, and C2, the height B1 from the opening 41a to the bottom 41b, and the height B2 from the end 40a to the base 40b is as follows. It is formed to satisfy the relationship.
C1 ≧ C2>A1> A2 and B1> B2

  FIG. 10 shows contact surfaces and spaces generated in the concave portions 41 and the convex portions 40 formed so as to satisfy these relationships. Since the heat sink 4 is formed to satisfy B1> B2, a space X is formed between the end 40a and the bottom 41b.

  Moreover, since the heat sink 4 is formed so that C1 ≧ C2> A1> A2, the outer edge portion of the end portion 40a contacts the side surface 40c. Therefore, contact surfaces D and E are generated between the outer edge portion of the end portion 40a and both side surfaces 41c of the recess 41 as shown in FIG.

  Further, since the heat sink 4 according to the present embodiment is formed so as to satisfy C1 ≧ C2> A1> A2, the side face 4d1 and the end face 4f are in contact with each other. Therefore, contact surfaces F and G are generated between the side face 4d1 and the end face 4f.

  In addition, since the heat sink 4 according to the present embodiment is formed so as to satisfy C1 ≧ C2> A1> A2, spaces Y and Z are formed between the side surface 40c and the side surface 41c.

  FIG. 11 is a view for explaining a conventional cooling structure in which a sealing material 500 is provided on a mating surface of two heat radiators. The cooling structure shown in FIG. 11 includes a first radiator 400-1 provided with a semiconductor element 91, a second radiator 400-2 joined to the first radiator 400-1, and these. It is comprised from the sealing material 500 provided in the joint of these heat radiators, and the fastening member 90 which fastens these heat radiators. In this cooling structure, in order to ensure waterproofness, it is necessary to apply the sealing material 500 to the joint part of each heat radiating body 400-1, 400-2, and each heat radiating body 400-1, 400-2 by the fastening member 90. Need to adhere. Therefore, compared with the heat sink 4 concerning embodiment of this invention, the extra time and cost in an assembly operation generate | occur | produce. Furthermore, since the sealing material 500 deteriorates due to heat or the like, sufficient waterproofness cannot be obtained during long-term use.

  FIG. 12 is a view for explaining a conventional cooling structure in which two radiators are connected by a metal member. In FIG. 12, the first radiator 400-3, the second radiator 400-4, one end is connected to the first radiator 400-3 by the fastening member 92, and the other end is joined by the fastening member 92. The cooling structure which consists of the metal member 93 connected to the 2nd heat radiator 400-4 is shown. In this cooling structure, it is necessary to integrally fix the heat dissipating bodies 400-3 and 400-4 using the fastening member 92. Therefore, compared with the heat sink 4 concerning embodiment of this invention, the extra time and cost in an assembly operation generate | occur | produce.

  In the heat sink 4 according to the present embodiment, a dovetail-shaped concave portion 41 is formed in the heat radiating body 4-2, a dovetail-shaped convex portion 40 is formed in the heat radiating body 4-1, and the convex portion 40 is formed in the concave portion 41. The heat radiating bodies 4-1 and 4-2 are connected to each other by being slid and inserted. Therefore, the fastening member 90 as shown in FIG. 11 is unnecessary, and extra time and cost in assembly work can be suppressed. Moreover, since the convex part 40 is formed in a dovetail shape and the concave part 41 is formed in a dovetail shape, it is possible to prevent water from entering from the mating surface of the convex part 40 and the concave part 41.

  The heat sink 4 is formed so that the convex portion 40 and the concave portion 41 satisfy C1 ≧ C2> A1> A2 and B1> B2. For example, when air is flowing as shown in FIG. 3, it is unlikely that rainwater will enter the heat sink 4 from the top of the heat sink 4, but this rain water is combined with the radiators 4-1 and 4-2. Rainwater can enter from the eyes. According to the heat sink 4 according to the present embodiment, since rainwater is blocked by the contact surfaces F and G, the conventional sealing material 500 is unnecessary.

  Moreover, in the heat sink 4 concerning this Embodiment, when the convex part 40 and the recessed part 41 satisfy | fill the said relationship, space Y, Z is formed between the side surface 40c and the side surface 41c, and the edge part 40a and the bottom part 41b A space X is formed between the two. Therefore, even when rainwater enters the spaces X, Y, and Z from the contact surfaces F and G, the rainwater can remain in the spaces X, Y, and Z due to the surface tension of the rainwater. It is discharged to the outside of the heat sink 4 from the joint of the heat radiating body 4-1 and the heat radiating body 4-2 through Y and Z. Thus, according to the heat sink 4 concerning this Embodiment, the sealing material 500 is unnecessary and it can suppress the time and cost accompanying the manufacture and an assembly operation.

  In the present embodiment, the convex portion 40 is provided on the radiator 4-1 and the concave portion 41 is provided on the radiator 4-2. However, the concave portion 41 is provided on the radiator 4-1 and the radiator 4 is provided. The same effect can be obtained even when the convex portion 40 is provided at -2.

  Moreover, the direction in which the convex part 40 and the recessed part 41 are provided is not limited to the direction shown by FIG. 5, For example, the recessed part 41 is the short side direction (left-right direction in FIG. 5) of the heat radiator 4-2. The same effect can be obtained even when the projection 40 is extended linearly and the projection 40 is extended linearly in the short direction of the radiator 4-1.

  Further, the shape of the fin 4b1 is not particularly limited, and a groove-shaped heat dissipation structure formed to increase the surface area of the base 4a1, for example, as long as the heat of the heat generating element 5 can be effectively dissipated. It may be. The same applies to the fin 4b2.

  As described above, the heat sink 4 according to the present embodiment is a heat sink 4 formed by combining a plurality of heat radiating bodies 4-1 and 4-2. A dovetail-shaped convex portion 40 provided in a projecting manner toward the heat radiating body 4-2 side is formed, and the other heat radiating body 4-2 has a dovetail-shaped concave portion 41 fitted to the convex portion 40. The convex portion 40 has a trapezoidal cross-sectional shape in which the width C2 of the end portion 40a facing the concave portion 41 is larger than the width A2 of the base portion 40b of the convex portion 40, and the concave portion 41 has a bottom portion 41b. The width C1 of the concave portion 41 has a trapezoidal cross section formed larger than the width A1 of the opening 41a of the concave portion 41. One of the radiators 4-1 and the other radiator 4-2 has the convex portion 40 fitted with the concave portion 41. Since it was made to couple | bond together in the state which match | combined, when each convex part 40 fits into the recessed part 41, each heat radiator 4 1,4-2 is connected. Therefore, the fastening member 90 as shown in FIG. 11 is unnecessary, and extra time and cost in the assembly work can be suppressed. Moreover, since the convex part 40 is formed in a dovetail shape and the concave part 41 is formed in a dovetail shape, it is possible to prevent water from entering from the mating surface of the convex part 40 and the concave part 41. As a result, it is possible to further reduce the cost while suppressing a decrease in waterproof performance at the joint portions of the plurality of radiators. Moreover, the heat sink 4 according to the present embodiment can be applied to various devices other than the power conditioner 100. By using the heat sink 4, the above-described effects can be obtained, and the size of the device can be reduced. Volume reduction can be achieved. Therefore, a preferable apparatus can be provided also from the point of LCA (Life Cycle Attachment).

  Moreover, since the convex part 40 and the recessed part 41 are formed so that C1> = C2> A1> A2 and B1> B2 may be sufficient as the heat sink 4 concerning this Embodiment, the edge part 40a, the bottom part 41b, A space X is formed between them, contact surfaces F and G are formed between the side surface 4d1 and the end surface 4f, and spaces Y and Z are formed between the side surface 40c and the side surface 41c. Contact surfaces D and E are formed between the outer edge portion of the end portion 40 a and the concave portion 41 of the convex portion 40. Therefore, the contact surfaces F and G prevent rainwater from entering from the joints of the radiators 4-1 and 4-2. Further, even if rainwater enters the spaces X, Y, and Z from the contact surfaces F and G, the rainwater can remain in the spaces X, Y, and Z, and the rainwater can pass through the spaces X, Y, and Z. It can be discharged to the outside of the heat sink 4. As a result, the sealing material 500 is not necessary, and the time and cost associated with the production and assembly work can be suppressed.

  Further, the power conditioner 100 according to the present embodiment is a power conditioner 100 that converts electric power generated by N (an integer of 1 or more) solar cell modules (heating elements 5) into alternating current power, Since it is provided with the heat sink 4 that is thermally connected to the heat generating element 5 and that combines the heat radiators 4-1 and 4-2, and the fan 6 that forcibly cools the heat sink 4. Thus, the cost can be reduced, and the device can be reduced in size and volume.

  The heat sink and the power conditioner shown in the present embodiment show an example of the contents of the present invention, and can be combined with other known techniques, and depart from the gist of the present invention. Of course, it is possible to change and configure such as omitting a part within the range.

  As described above, the present invention can be applied to a heat sink and a power conditioner, and in particular, it is possible to further reduce the cost while suppressing a decrease in waterproof performance at a joint portion of a plurality of radiators. It is useful as an invention.

  1 housing, 1b side surface, 1c lower surface, 2 exhaust port, 3 outside air intake port, 4 heat sink, 4a1, 4a2 base, 4b1, 4b2 fin, 4c1, 4c2 partition plate side surface, 4d1 non-partition plate side surface, 4e1, 4e2, 4e3 End part, 4f end face, 4-1, 4-2 radiator, 5 heating element, 6 fan, 7 partition plate, 8 blower chamber, 9, 90, 92 fastening member, 40 convex part, 41 concave part, 91 semiconductor element, 93 metal members, 100 power conditioners, 400-1, 400-3 first radiator, 400-2, 400-4 second radiator.

Claims (2)

A heat sink formed by combining a plurality of radiators,
On one of the heat radiators, a dovetail-like convex portion provided in a protruding shape toward the other heat radiator side is formed,
The other radiator is formed with a dovetail recess that fits into the protrusion,
The convex portion has a trapezoidal shape in which the width of the end facing the concave portion is larger than the width of the base portion of the convex portion,
The concave portion has a trapezoidal cross section formed such that the width of the bottom of the concave portion is larger than the width of the opening of the concave portion,
The width of the opening is A1, the width of the bottom is C1, the width of the end is C2, the width of the base is A2, the height from the opening to the bottom is B1, and from the end to the base When the height of B2 is B2, the convex part and the concave part are formed so as to satisfy C1 ≧ C2>A1> A2 and B1> B2,
One heat sink and the other heat radiator are integrally coupled in a state where the convex portion is fitted to the concave portion. A power conditioner that converts electric power generated by N (an integer greater than or equal to 1) solar cell modules into AC power,
A heat sink that is thermally connected to the heating element and that combines a plurality of radiators;
A fan forcibly cooling the heat sink;
With
On one of the heat radiators, a dovetail-like convex portion provided in a protruding shape toward the other heat radiator side is formed,
The other radiator is formed with a dovetail recess that fits into the protrusion,
The convex portion has a trapezoidal shape in which the width of the end facing the concave portion is larger than the width of the base portion of the convex portion,
The concave portion has a trapezoidal cross section formed such that the width of the bottom of the concave portion is larger than the width of the opening of the concave portion,
The width of the opening is A1, the width of the bottom is C1, the width of the end is C2, the width of the base is A2, the height from the opening to the bottom is B1, and from the end to the base When the height of B2 is B2, the convex part and the concave part are formed so as to satisfy C1 ≧ C2>A1> A2 and B1> B2,
One power radiator and another heat radiator are integrally coupled in a state where the convex portion is fitted to the concave portion.

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