JP2010114121A - Heat radiator of electrical component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat radiator of an electrical component that does not cause a heat exchanger plate to deform and makes adhesiveness between the heat exchanger plate and a cooling member higher than before. <P>SOLUTION: The heat radiator 10 has the heat exchanger plate 12 and cooling member 14. The heat exchanger plate 12 is in a plate shape, and while the electrical component 16 is fitted to one surface of the heat exchange plate 12, a coolant jacket 14 is brought into contact with the other surface. The heat exchanger plate 12 and cooling member 14 are brought into contact with each other by clamping a clamping member 22. The electrical component 16 is disposed on an extension of the center axis of the clamping member 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a radiator for an electrical component used in an air conditioner or the like.

  In an air conditioner such as an inverter circuit, an electrical component having a power device mounted on a printed board is used. A considerable amount of heat is generated by the operation of the electrical components. In order to prevent the destruction and malfunction of the electrical component, a radiator is attached to the electrical component, and the heat generated by the electrical component is forcibly radiated (FIG. 3).

  The radiator 50 includes a heat transfer plate 52 and a cooling member 54. The electrical component 16 is attached to one surface of the heat transfer plate 52, and the cooling member 54 is in close contact with the other surface of the heat transfer plate 52. Moreover, in order to perform a vapor compression refrigeration cycle, the air conditioner is provided with a pipe for circulating a high-pressure refrigerant such as chlorofluorocarbon. This pipe is fitted into and closely attached to a groove (not shown) of the cooling member 54 to transfer the heat of the electrical component 16 to the refrigerant flowing in the pipe.

  In order to fix the piping to the cooling member 54, pressing, brazing, welding, screwing, or the like is performed. The electrical component 16 needs to mount a power device on a printed circuit board, and a manufacturing process different from the cooling member 54 is required. Further, a heat transfer plate 52 is attached to the electric component 16, and the electric component 16 is accommodated in a case (not shown) with the heat transfer plate 52 exposed. The electrical component 16 is transported, and the heat transfer plate 52 and the cooling member 54 are fastened with screws 62. The screw 62 is attached to the periphery of the electrical component 16.

  However, at the location where the screw 62 is tightened, the heat transfer plate 52 and the cooling member 54 are pulled together, and a gap is formed between the heat transfer plate 52 and the cooling member 54 as the distance from the screw 62 increases (FIG. 3C). The heat conduction deteriorates and the electrical component 16 cannot be cooled. When the strength of the heat transfer plate 52 is increased so as not to generate a gap, the thickness of the heat transfer plate 52 increases. The heat transfer plate 52 becomes heavy or the cost increases. Further, if the number of screws 62 is increased so as not to generate a gap, the cost is increased and the work is troublesome. Furthermore, it is conceivable to apply grease for heat transfer between the heat transfer plate 52 and the cooling member 54, but this is troublesome in terms of work.

  If the cooling member 54 is transported, the electrical component 16 can be directly attached to the cooling member 54, but piping is in close contact with the cooling member 54, which is not preferable because it takes more time to transport than the electrical component 16.

  Patent Document 1 below discloses a technique for transferring heat generated by a switching element to cooling water passing through a heat dissipation plate via a heat conductive plate, an insulating sheet, and a heat dissipation plate. The holding plate pressurizes the switching element in the direction of the heat conduction plate, so that the switching element, the heat conduction plate, the insulating sheet, and the heat dissipation plate are brought into close contact with each other. However, the holding plate only pressurizes a part of the switching element, and there is a possibility that only a part of the switching element, the heat conducting plate, the insulating sheet, and the heat radiating plate are in close contact with each other. The amount of heat dissipated from the switching element is reduced, and the switching element may be destroyed or malfunctioned.

Japanese Patent Laid-Open No. 11-41910 (paragraph number 0490, FIGS. 4 and 5)

  An object of the present invention is to provide a radiator for an electrical component that does not cause unnecessary deformation in the heat transfer plate and has improved adhesion between the heat transfer plate and the refrigerant jacket as compared with the conventional one.

  The radiator of the present invention has one surface and the other surface, and an electrical component is attached to the one surface, and is attached to the other surface of the heat transfer plate, and a pipe through which the refrigerant flows is provided. And a cooling member. The heat transfer plate and the cooling member are fixed by a fastening member, and the electrical component and the fastening member are provided on a vertical line passing through the heat transfer plate.

  When the electrical component is driven to generate heat, heat is conducted to the refrigerant flowing in the piping provided in the cooling member via the heat transfer plate. The heat transfer plate and the cooling member are brought into close contact with each other by the fastening member at the place where the most heat conduction occurs, so that the heat conduction is performed smoothly.

  The fastening member is a screwing member including a screw. The central axis of the screw coincides with the vertical line.

  In the heat radiator of the present invention, since the heat transfer plate and the cooling member are fastened on the opposite side of the electrical component in the heat transfer plate, the portion with the most heat is in close contact, and heat conduction from the heat transfer plate to the cooling member is achieved. Can be performed efficiently. It is possible to efficiently dissipate the heat generated by the electrical components. It is also possible to reduce the number of fastening members, and the manufacturing can be simplified.

  The present invention will be described with reference to the drawings. The radiator of the present invention cools electrical components used in air conditioners and the like.

  As shown in FIG. 1, the radiator 10 includes a heat transfer plate 12 and a cooling member 14. The heat transfer plate 12 has a plate shape, and an electrical component 16 is attached to one surface of the heat transfer plate 12, and the cooling member 14 is in close contact with the other surface.

  Screw mounting holes (not shown) are provided at a plurality of locations such as two or four locations of the electrical component 16, and the electrical component 16 is screwed to the heat transfer plate 12. The contact surface between the electrical component 16 and the heat transfer plate 12 is preferably flat so that the electrical component 16 can be in close contact with the heat transfer plate 12.

  The heat transfer plate 12 has a larger area than the electrical component 16, and the electrical component 16 is attached to the center of the heat transfer plate 12. This is because the electrical component 16 is a heat source, and heat is transferred while spreading in various directions instead of one direction. In FIG. 1B, heat spreads at an angle of about 45 degrees from above the electrical component 16, so the heat transfer performance of the upper part of the electrical component 16 is the most important.

  The cooling member 14 has a flat rectangular parallelepiped shape. Further, a groove 18 is formed in the cooling member 14, and a pipe 20 through which the refrigerant circulates is attached to the groove 18. The attachment is performed by fitting the pipe 20 into the groove 18 and pressing the cooling member 14 and the pipe 20. In FIG. 1, two grooves 18 are formed, but the number of grooves 18 is not limited. Further, the contact area between the cooling member 14 and the pipe 20 may be widened by meandering the groove 18 and the pipe 20.

  The heat transfer plate 12, the cooling member 14, and the pipe 20 are made of metal such as aluminum. By using aluminum, it becomes a heatsink that is lightweight and has good heat dissipation.

  The heat transfer plate 12 and the cooling member 14 are brought into close contact with the fastening member 22. The fastening member 22 and the electrical component 16 are disposed on one vertical line Y that penetrates the heat transfer plate 12. If there is one fastening member 22, one vertical line Y passes through the center of the electrical component 16. The number of vertical lines Y is the same as the number of fastening members 22. Examples of the fastening member 22 include a screwing member, particularly a screw (bolt, screw). Hereinafter, the screw 22 will be described as an example.

  The electrical component 16 is disposed on an extension line of the central axis of the screw 22. The central axis of the screw 22 faces in the vertical direction with respect to one surface of the heat transfer plate 12, and one vertical line Y coincides with the central axis of the screw 22. As shown in FIG. 1A, when the radiator 10 is viewed from the cooling member 14, the electrical component 16 and the screw 22 overlap.

  When the screw 22 is tightened, the heat transfer plate 12 and the cooling member 14 are in close contact with each other in the vicinity of the screw 22. The screw 22 is tightened at the position where the heat generated in the electrical component 16 is most conducted, and the heat is most easily conducted from the heat transfer plate 12 to the cooling member 14. The efficiency of heat dissipation of the electrical component 16 is the best.

  Since the screw 22 is fastened at the center of the heat transfer plate 12, the end of the heat transfer plate 12 may be warped. However, the amount of heat transferred to the end of the heat transfer plate 12 is small and does not adversely affect the heat dissipation of the electrical component 16.

  The screws 22 are made of metal for transferring heat, and the number of screws 22 is not limited. The number of screws 22 is appropriately adjusted according to the size of the electrical component 16. Conventionally, screws are arranged on the periphery of the electrical component 16, but in the present application, depending on the size of the electrical component 16, the number of the screws 22 is one or two, and the heat transfer plate 12 and the cooling member 14 Screwing becomes easy. If the number of screws 22 is reduced, the manufacturing cost can be reduced.

  In order to tighten the screw 22, a screw hole 24 is formed on the other surface of the heat transfer plate 14 by a tap. The cooling member 14 is provided with a hole 26 through which the axis of the screw 22 passes and the head of the screw 22 does not pass through. The screw 22 is passed through the hole 26 of the cooling member 14, put into the screw hole 24 of the heat transfer plate 12, and tightened. The screw 22 does not interfere with the mounting of the electrical component 16.

  The contact surface between the heat transfer plate 12 and the cooling member 14 is made as smooth as possible. For example, the surface roughness Ra of the contact surface between the heat transfer plate 12 and the cooling member 14 is set to about 50 to 100 μm. Even if the tightening force of the screw 22 becomes weak, the adhesion between the heat transfer plate 12 and the cooling member 14 is good. The portion to be smoothed may be the entire contact surface between the heat transfer plate 12 and the cooling member 14, but only the peripheral edges of the holes 24 and 26 to which the screws 22 are attached may be smoothed. The area to be smoothed is equal to or larger than the area of the electrical component 16. Improves the adhesion at the position where heat conduction occurs most.

  In the above description, one electrical component 16 is attached to one radiator 10, but a plurality of electrical components 16 may be attached to one radiator 10. For each electrical component 16, the electrical component 16 and the screw 22 are provided on the same vertical line Y.

  As described above, the present invention is configured to improve the adhesion between the heat transfer plate 12 and the cooling member 14 at the place where the most heat conduction occurs. Therefore, the heat generated in the electrical component 16 can be efficiently radiated. Can do. If the number of screws 22 is reduced as compared with the conventional case, the manufacture is facilitated. Further, conventionally, it is necessary to apply heat transfer grease between the heat transfer plate 12 and the cooling member 14, but in the present invention, grease may not be used, and the manufacture becomes easy. Although the air conditioner has been described as an example, the radiator 10 of the present application can be used even with other devices, and the same effect can be obtained.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment. For example, although the screw was mentioned as the fastening member 22, a taper pin may be used. A hole is provided in the heat transfer plate 12 from the cooling member 14, and a taper pin is press-fitted into the hole and fastened.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the gist thereof.

Next, the measurement of the thermal resistance performed by the present invention and the conventional radiator will be described. FIG. 2A shows the radiator 10 of the present invention, and FIG. 2B shows the conventional radiator 50. The position of the X mark is the position where it is screwed. The radiator 10 of the present invention is screwed at the center of the electrical components 16A, B, and the conventional radiator 50 is screwed around the electrical components 16A, B. Table 1 shows the thermal resistance obtained when driving the electrical components 16A and 16B. In particular,
Thermal resistance = (temperature of electrical component−temperature of refrigerant) / power consumption of electrical component.

  From Table 1, the thermal resistance of the radiator 10 of the present invention is about 15% lower than the thermal resistance of the conventional radiator 50 in any of the electrical components 16A and 16B. The radiator 10 of the present invention has a higher cooling capacity for the electrical components 16A and 16B than the conventional radiator 50.

It is a figure which shows the heat radiator of this application, (a) is a top view, (b) is an AA sectional view. It is a figure which shows a structure when the thermal resistance of a radiator is measured, (a) is a radiator of this application, (b) is a conventional radiator. It is a figure which shows the conventional heat radiator, (a) is a top view, (b) is a BB sectional drawing, (c) is the figure which made the clearance gap between a heat sink and a cooling member.

Explanation of symbols

10: radiator 12: heat transfer plate 14: cooling member 16, 16A, 16B: electrical component 18: groove 20: piping 22: fastening member (screw)

Claims (3)

A plate-like heat transfer plate having one surface and the other surface, and electrical components are attached to the one surface;
A cooling member attached to the other surface of the heat transfer plate and provided with a pipe through which a refrigerant flows;
With
The radiator of the electrical component in which the heat transfer plate and the cooling member are fixed by a fastening member, and the electrical component and the fastening member are provided on one vertical line that penetrates the heat transfer plate. The radiator according to claim 1, wherein the fastening member includes a screwing member. The heat radiator according to claim 1 or 2, wherein the fastening member is a screw, and a central axis of the screw coincides with the vertical line.

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