JP2012084731A - Plate laminate type cooling apparatus - Google Patents

Abstract

An object of the present invention is to provide a highly reliable plate stacking type cooling apparatus that reduces the number of parts and reduces brazing defects.
A laminated body in which a first heat radiating plate and a second heat radiating plate that are alternately laminated are sandwiched between a pair of end plates, and a square opening is provided on a side surface of the laminated body. A first joint pipe that is joined after being inserted into the square insertion port, and a second joint pipe that is joined after being inserted into a second square insertion port provided with a square opening on the side surface of the laminate. It consists of a joint pipe. The first heat dissipating plate of the laminate includes a first rectangular opening provided on one end side, and a second rectangular opening provided on the other end side and having a shape symmetrical to the first rectangular opening. A central opening which is continuous with the first rectangular opening but is disconnected from the second rectangular opening is opened, and the second heat dissipating plate of the laminate is formed by extending the first heat dissipating plate longitudinally. It has a shape turned upside down.
[Selection] Figure 4

Description

The present invention relates to a cooling device, and more particularly to a plate stack type cooling device configured by stacking a plurality of heat dissipation plates.

  In recent years, with the increase in capacity and size of CPUs (Central Processing Units) and inverters, the heat transfer characteristics of the cooling devices used for them have been improved. As one of the cooling devices having high heat transfer characteristics, a plate stacked type cooling device is known in which a plurality of heat radiation plates each having a slit-like long hole are stacked and joined by brazing. Since the plate stack type cooling device can take a large heat transfer area with respect to its volume, it has excellent cooling performance. The plate stack type cooling apparatus forms a coolant flow path by stacking an upper plate, a heat dissipation plate, and a lower plate in the stacking direction.

In a general plate laminated heat exchanger, the joint portion is attached perpendicular to the coolant flow direction of the heat radiating plate portion. In this type of structure, the joint can be easily joined, but when the coolant flows from the joint into the heat radiating plate, the flow path changes in the vertical direction, causing bending loss.

As a plate laminated heat exchanger having high performance, the one disclosed in Patent Document 1 is known. In the present invention, laminated plates formed by stamping metal thin plates are laminated in the thickness direction one by one. An end plate is attached to the end of the heat radiating plate in the longitudinal direction, and a joint for inflow and out of the coolant is attached to the end plate. These are brazed to complete the plate stack type cooling device.

In the plate laminated heat exchanger according to Patent Document 1, since the joint portion is attached in parallel to the coolant flow direction of the heat radiating plate portion, the occurrence of bending loss is small. However, since the joint is circular, it cannot be directly joined to the heat radiating plate manufactured by punching. An end plate for inserting a circular joint is required between the heat radiating plate and the joint. Moreover, since there are many brazing places, such as a joint and an end plate, an end plate and a heat radiating plate, a brazing defect is likely to occur.

JP 2005-166855 A

  The present invention has been made to solve the above-described problems, and has as its object to provide a highly reliable plate stacking type cooling apparatus that reduces the number of components and reduces brazing defects. .

The plate stack type cooling apparatus according to the present invention includes a first heat dissipating plate and a second heat dissipating plate, which are alternately stacked, sandwiched between a pair of end plates, and a first rectangular insertion port on opposite side surfaces. And a first rectangular insertion port having a square opening at one end and the rectangular opening provided on a side surface of the laminate. After insertion into the first joint pipe joined after insertion into the second square insertion port which has a square opening at one end and this square opening is provided on the side of the laminate It is the plate lamination type cooling device provided with the 2nd joint pipe joined. The first heat dissipating plate of the laminate includes a first rectangular opening provided on one end side, and a second rectangular opening provided on the other end side and having a shape symmetrical to the first rectangular opening. A central opening which is continuous with the first rectangular opening but is disconnected from the second rectangular opening is opened, and the second heat dissipating plate of the laminate is formed by extending the first heat dissipating plate longitudinally. It has a shape turned upside down.

  According to the present invention, a joint having a square shape on one side and a circular shape on the other side is inserted into a rectangular insertion hole formed when a plurality of layers of heat dissipation plates having rectangular holes are stacked, and directly joined by brazing. Since the end plate is not required and the number of parts can be reduced, the cost is low and there are few defective brazings.

It is a schematic perspective view which shows the whole plate laminated | stacked cooling device concerning Embodiment 1 of this invention. It is a perspective view of the heat sink plate concerning embodiment of this invention. It is a perspective view of the joint concerning an embodiment of the invention. It is a disassembled perspective view which shows the whole plate lamination type cooling device concerning embodiment of this invention. It is sectional drawing of the plate lamination type cooling device concerning embodiment of this invention. FIG. 7 shows the first step in the case of forming the joint of the plate lamination type cooling device in three steps according to the second embodiment of the present invention, and is a view seen from the pipe axial direction when the pipe is set in the die. is there. It is sectional drawing before inserting the punch for expressing the 1st process and forming a pipe. It is sectional drawing after inserting the punch, showing the 1st process. It is the figure which represented the 1st process and looked at the pipe after inserting a punch after setting a pipe to a die from the pipe axial direction. It is the figure seen from the pipe axial direction when the 2nd process at the time of shape | molding the coupling of a plate lamination type cooling device in 3 processes is shown, and setting a pipe to the die | dye. It is sectional drawing before inserting the punch for expressing the 2nd process and forming a pipe. It is sectional drawing after inserting the punch, showing the 2nd process. It is the figure which represented the 2nd process, and saw the pipe after inserting a punch after setting a pipe to a die from the pipe axial direction. It is the figure seen from the pipe axial direction when the 3rd process at the time of shape | molding the coupling of a plate lamination type cooling device in 3 processes is shown, and setting a pipe to the die. It is sectional drawing showing the 3rd process and inserting the punch for shape | molding a pipe. It is sectional drawing after inserting the punch, showing the 3rd process. It is the figure which represented the 3rd process, and saw the pipe after inserting a punch after setting a pipe to a die from the pipe axial direction. It is a schematic diagram of the state which concerns on Embodiment 3 of this invention, and set the round rod to the die | dye before shape | molding the coupling of a plate lamination type cooling device by forging. It is a schematic diagram immediately after shape | molding the coupling of a plate lamination type cooling device by forge. It is the schematic diagram of the state set to the die | dye in order to drive the bottom plate with a press for the pipe formed by forging. It is the schematic diagram immediately after punching the bottom plate of the pipe shape | molded by forging with the press.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a schematic perspective view showing an entire plate laminated cooling apparatus according to the present invention. The plate laminated cooling device 100 is joined to a laminated body 30 composed of a plurality of mutually fixed plates, a pipe-shaped joint 35 a joined to the side surface of the laminated body 30, and another side surface of the laminated body 30. It is comprised from the pipe-shaped coupling 35b. The laminated body 30 includes a plurality of heat radiation plates 31 sandwiched between a pair of end plates 34a and 34b. Square insertion holes 5a and 5b are formed on both side surfaces on the long side. The heat radiating plate 31 is divided into a heat radiating plate 31a and a heat radiating plate 31b having different arrangement directions. The plates 31a and the heat dissipation plates 31b are alternately stacked.

The size of the square insertion slot 5a and the square insertion slot 5b are the same. The joint 35a is fitted into the square insertion port 5a and fixed by brazing. The joint 35b is fitted into the square insertion port 5b and fixed by brazing. The dimensional shape of the joint 35a is the same as the dimensional shape of the joint 35b. The coolant flows in from the joint 35a, passes through the flow path formed in the stacked body 30, and then flows out from the joint 35b. The arrangement direction of the joints 35 a and 35 b is orthogonal to the longitudinal direction of the plate stack type cooling device 100.

FIG. 2 is a perspective view showing a heat radiating plate according to the present invention. The heat radiating plate 31 is obtained by punching a thin plate or the like, and a slit-like long hole (central opening) 32 is opened in a comb shape at the center. Rectangular holes 33a and 33b are formed by press on both side surfaces of the heat radiating plate 31 in the longitudinal direction. The rectangular hole (first rectangular opening) 33 a and the rectangular hole (second rectangular opening) 33 b are provided at symmetrical positions on both ends of the heat dissipation plate 31. Although the rectangular hole 33a and the long hole 32 are connected and are in communication, the rectangular hole 33b and the long hole 32 are disconnected (independent). The widths of the rectangular hole 33a and the rectangular hole 33b are the same. The heat dissipating plate 31a and the heat dissipating plate 31b are in a relationship of being rotated 180 degrees about the longitudinal axis of the heat dissipating plate 31.

FIG. 3 is a perspective view showing a joint according to the present invention. The joint 35 includes a rectangular opening 35a having one end opened in a rectangular shape, a circular pipe part 35c having one end opened circularly, and a connecting part 35b connecting the square opening 35a and the circular pipe part 35c. It is composed of The joint 35 is formed by integrally forming a square opening 35a, a connecting part 35b, and a circular pipe part 35c.

FIG. 4 is an exploded perspective view showing the entire plate stack type cooling apparatus according to the present invention. Six heat radiation plates 31 are stacked between the end plate 34a and the end plate 34b. The rectangular insertion holes 5a and 5b are formed by alternately arranging the rectangular holes 33a and the rectangular holes 33b. The number of the heat radiating plates 31a and the heat radiating plates 31b is the same.

  In short, the heat-dissipating plate 31a in which the slit-like long holes 32 and the rectangular holes 33a and 33b are formed by pressing and the heat-dissipating plate 31b in which the heat-dissipating plate 31a is turned over in the longitudinal direction are alternately stacked in several layers, The plate 34 is sandwiched between the upper and lower sides. When the rectangular holes 33a and 33b of the heat radiating plate are stacked in layers, a square hole is formed. Joints 35a and 35b each having a square shape on one side and a circular shape on one side are inserted into the square holes.

FIG. 5 is a cross-sectional view showing the plate stack type cooling device of the present embodiment. The heat radiating plates 31a and the heat radiating plates 31b are alternately stacked. The coolant 60 flows in from the joint 35a, and flows out from the joint 35b after passing through a continuous flow path space formed by the elongated holes of the stacked heat radiation plates 31a and 31b. The heat radiation plates 31a and 31b, the end plates 34a and 34b, and the joints 35a and 35b are joined by batch brazing in a furnace.

A brazing sheet pre-coated with a brazing material on both sides may be used for the heat radiating plate 31. The brazing material at the joint between the joint 35 and the heat radiating plate 31 is placed by applying a paste brazing material to the joint 35 or winding a ring braze around the joint 35. When the heat radiating plate 31 is stacked in several layers, the rectangular hole 33 becomes a rectangular insertion hole, so that the positioning of the heat radiating plate 31 and the joint 35 is easy. Further, since the joint 35 and the heat radiating plate 31 are directly joined, joining can be performed without increasing the number of parts.

In addition, since one side of the joint 35 is circular, it is easy to connect to external piping. In addition, by making one side of the joint 35 square, the clearance with the square hole formed when the heat radiation plate 31 is stacked in several layers can be reduced as much as possible, so that brazing defects can be suppressed. Depending on the method of forming the joint 35, the corner of the square has a little R. If R is large, the gap between the insertion hole and the corner of the joint becomes large, and brazing defects are likely to occur. In order to suppress the occurrence of brazing failure, the corner R of the square joint is desirably 1 mm or less.

Embodiment 2. FIG.
In the second embodiment, a method for manufacturing a joint will be described with reference to FIGS. In the second embodiment, the joint 35 of the plate lamination type cooling device is obtained by press molding in three steps. FIG. 6 is a view seen from the pipe axial direction when a round pipe is set on the die in the first step. The state where the round pipe 36 is mounted between the upper die 37a and the lower die 37b is shown.

FIG. 7 is a cross-sectional view showing a state before a punch for forming a pipe is inserted into a die. When the upper die 37a and the lower die 37b are combined, a space for expanding the tube appears on the punch insertion side. FIG. 8 is a sectional view showing a state after the punch is inserted. A state in which the punch 38 is inserted into the die hole and one end of the round pipe is expanded is shown. FIG. 9 is a view of the pipe after inserting the punch after setting the pipe in the die in the first step, as viewed from the pipe axial direction.

10 to 13 show the second step. It is the figure seen from the pipe axial direction when the pipe expanded and formed at the 1st process is set to the die. In the second step, the second die 40 and the second punch 41 are used. In this step, the round pipe 39 expanded in the first step is expanded into an elliptical shape.

FIG. 11 is a cross-sectional view showing a state before inserting a punch for forming a pipe. The tip of one side of the round pipe 39 has already been expanded into a circular shape. FIG. 12 is a cross-sectional view showing a state after the punch 41 is inserted. FIG. 13 is a view of the round pipe 42 after the punch 41 is inserted after setting the round pipe 39 on the die 40 in the second step, as viewed from the pipe axial direction. The expanded circular portion is deformed into an ellipse.

In the third step, the elliptical portion is deformed into a rectangular shape. FIG. 14 is a view seen from the pipe axial direction when the pipe formed in the second step is set in a die. The tip end of the third die 43 is opened in a rectangular shape. The elliptical round pipe 42 is sandwiched between the rectangular portions of the third die 43. FIG. 15 is a cross-sectional view showing a state before the third punch 44 for forming the round pipe 42 is inserted.

FIG. 16 is a cross-sectional view showing a state after the third punch 44 is inserted into the third die 43. FIG. 17 is a view of the round pipe after the punch is inserted after setting the round pipe in the die in the third step, as seen from the pipe axial direction. The round pipe 45 represents that the tip portion is deformed from an elliptical shape to a rectangular shape.

As shown in FIGS. 6 to 17, the joint according to the second embodiment of the present invention gradually expands the end portion of the round pipe 36 and is finally formed into a square shape. By forming the joint by this method, machining is not required and it can be manufactured at low cost. In this embodiment, a method of extrusion molding in three steps is described, but depending on the material and the plate thickness, there is a possibility that the number of steps becomes one to ten.

Embodiment 3 FIG.
In the third embodiment, a method for forming a joint of a plate lamination type cooling apparatus by forging will be described. FIG. 18 shows a schematic view of a state in which a round rod is set on a die. A round rod 47 is set on the hollow fourth die 46. The fourth punch 48 is press-fitted into the fourth die 46. FIG. 19 is a schematic view immediately after the fourth punch 48 is press-fitted into the round rod. A bottomed pipe 49 is formed from the round rod.

FIG. 20 is a schematic view showing a state in which a bottom plate is formed by forging and is set on a die in order to drive a bottom plate with a press. The fifth die 49 penetrates. A state before the fifth punch 50 is press-fitted into the bottomed pipe 51 is shown. FIG. 21 shows a schematic view immediately after the bottom plate of a pipe formed by forging is punched with a press. Since the fifth punch 50 is press-fitted, the bottom plate of the bottomed pipe 51 is punched out.

Compared with the manufacturing method of the second embodiment, in the third embodiment, since the joint is manufactured by forging, the movement of the material is easy, and the R at the corner of the joint can be made as small as possible.

100 plate laminated cooling device, 34 end plate, 31 heat radiation plate, 30 laminated body, 35 joint 35

Claims (4)

The first heat radiation plate and the second heat radiation plate, which are alternately stacked, are sandwiched between a pair of end plates, and a first square insertion port and a second square insertion port are provided on opposite side surfaces. A laminated body,
A first joint pipe having a square opening at one end and joined after being inserted into a first square insertion port provided on a side surface of the laminate;
A second joint pipe which has a square opening at one end and is joined after being inserted into a second square insertion port provided on a side surface of the laminate. Is a plate stack type cooling device,
The first heat radiating plate of the laminated body has a first rectangular opening provided on one end side and a second rectangular opening provided on the other end side and having a shape symmetrical to the first rectangular opening. A central opening that is continuous with the first rectangular opening but is disconnected from the second rectangular opening,
The laminated plate cooling apparatus according to claim 1, wherein the second heat radiating plate of the laminated body has a shape in which the first heat radiating plate is turned over in the longitudinal direction. The plate laminated cooling device according to claim 1, wherein the first joint pipe and the second joint pipe are formed by press working. The plate stack type cooling apparatus according to claim 1, wherein the first joint pipe and the second joint pipe are formed by forging. 2. The plate stack type cooling device according to claim 1, wherein a plurality of rectangular comb blades are arranged at equal intervals in the longitudinal direction in the central opening of the heat radiating plate.

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