JP2008190775A - Brazed flow channel plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brazed flow channel plate capable of reducing a probability of plugging of a flow channel by a melted brazing filler metal in the brazed flow channel plate formed by using paired brazing sheets. <P>SOLUTION: In this brazed flow channel plate constituted by adhering the brazing sheets respectively having a sheet core material composed of a metallic material and a brazing material attached to the front and back of the sheet core material as the pair of front and back, and forming a flow channel by a recessed portion formed on at least one of the adhesive opposed faces of the brazing sheets, a wedge-shaped space for allowing the brazing filler metal to enter therein by capillary phenomenon, is formed on the adhesive opposed faces of the pair of brazing sheets at least at one side in the extending direction of the flow channel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brazing flow path plate used for, for example, a radiator that cools a passing liquid.

  For example, a CPU (heat source) cooling system that generates heat has a heat sink that contacts the CPU to take heat away, a radiator, and a liquid pump that circulates a coolant between the heat sink and the radiator as basic components. Therefore, downsizing and high reliability are achieved so that it can be mounted on a small device such as a notebook PC.

  Of these, a radiator is generally a brazed flow path plate in which a brazing sheet having a sheet core material made of a metal material and a brazing material attached to the front and back surfaces of the sheet core material is bonded as a pair of front and back surfaces. Yes. On at least one of the bonding facing surfaces of the brazing sheet, a recess for forming a flow path is formed, and the brazing material is melted and bonded by heating with the pair of brazing sheets stacked. The adhesion structure and adhesion method of the brazing flow path plate using such a brazing sheet are well known.

In such a brazing flow path plate, there has been a problem that the melted excess brazing material may block the flow path. For this reason, it has already been proposed that an outer bent portion called a “beak” is provided on the outer peripheral portion of a pair of brazing sheets, and the extra brazing material melted in the outer bent portion is absorbed and stored by capillary action. ing.
JP-A-6-97338 Japanese Patent Laid-Open No. 2003-8273 JP 2003-324174 A

  However, the radiator being developed by the present applicant is required to be extremely thin and miniaturized, and the brazed flow path plates having the “beak” on the outer periphery are mutually connected. The air circulation space between them is sacrificed and efficient heat dissipation is not possible.

  The present invention is based on the above problem awareness, and in the brazed flow path plate formed by using a pair of brazing sheets, the melted brazing material passes through the flow path without adopting a configuration in which a “beak” is provided on the outer peripheral portion. An object of the present invention is to obtain a brazed flow path plate with a low possibility of blocking.

  In the present invention, a brazing sheet having a sheet core material made of a metal material and a brazing material attached to the front and back surfaces of the sheet core material is bonded as a pair of front and back surfaces, and formed on at least one of the bonding facing surfaces of the brazing sheet. In the brazed flow path plate that forms the flow path by the recessed portion, in the first aspect, the brazing material is positioned on at least one side in the flow path extending direction on the bonding facing surface of the pair of brazing sheets. It is characterized by the formation of a wedge-shaped space that enters by capillary action.

  The wedge-shaped flow path includes a slow-angle wedge part having a small angle with respect to the bonding facing surface and a steep-angle wedge having a large angle so that the brazing material can easily enter the back part and secure a flow path area. It is preferable to comprise from a part.

  The pair of brazing sheets can have a shape around the flow path symmetrical with respect to the adhesion facing surface. Alternatively, the gentle-angle wedge portion can be formed on only one of the pair of brazing sheets and can be asymmetric.

  According to the second aspect of the present invention, in the brazed flow path plate in which the flow path is formed by a recess formed in at least one of the adhesively facing surfaces of the paired brazing sheets, a part of the flow path is replaced with another part of the flow path. It is characterized in that it is formed wider than the channel width, and this wide portion is used as a brazing material storage space.

  When the flow path has a bent portion, a brazing material storage space can be formed in the bent portion. Specifically, the bent portion is a U-shaped folded portion.

  If the distance between the opposing surfaces of the pair of brazing sheets in the brazing material storage space is set to be narrower than the distance between the other flow path portions, the entry of the brazing material by capillary action can be further promoted.

  The flow path formed by the pair of brazing sheets may be a folded flow path bent at least once in a U shape, and an inlet hole and an outlet hole for fluid may be formed at both ends of the U shape flow path. it can.

  Then, if the brazing material storage space that communicates with the inlet hole and the outlet hole and faces in the direction opposite to the flow path connecting the inlet hole and the outlet hole is formed, the brazing material storage space is not affected without affecting the flow path. Can be formed.

  In the pair of brazing sheets, a spacer portion protruding outward at the inlet hole and outlet hole portions is formed, and the spacer portions of the superposed brazing flow path plates are brought into contact with each other, and the superposed brazing flow paths An air passage space can be formed in the remainder of the plate.

  In addition to the spacer portions described above, a pair of brazing sheets are integrally formed with spacer protrusions that abut each other when a plurality of brazing flow path plates are overlapped to secure a space between the brazing flow path plates. Can do.

  According to the present invention, in a brazing flow path plate formed using a pair of brazing sheets, a molten brazing material is less likely to block the flow path without adopting a configuration in which a “beak” is provided on the outer peripheral portion. A brazing flow path plate can be obtained, and a radiator having high cooling efficiency that does not hinder the passage of air between the plurality of brazing flow path plates can be configured.

  FIG. 13 is a conceptual diagram of a water cooling system of a CPU (heat generation source) 10 having a radiator 20 configured by combining a plurality of brazing flow path plates 30 according to the present invention. The CPU 10 is in contact with the heat transfer heat sink 11, and the coolant supplied from the liquid pump 12 to the heat transfer heat sink 11 flows through the flow path in the heat transfer heat sink 11 and takes heat away from the CPU 10. The coolant heated by the heat transfer heat sink 11 is cooled by receiving cooling air from the cooling fan 22 while flowing through the liquid flow path 21 of the radiator 20, returns to the liquid pump 12, and repeats this circulation.

  FIG. 12 is a perspective view showing an example of a radiator 20 using a plurality of brazing flow path plates 30. The brazed flow path plates 30 stacked in a plurality of stages (five stages in the illustrated example) are connected and connected by a flow path block 40. The flow path block 40 includes an upper body 41 having an inlet line 23 and an outlet line 24, and a lower body 42 that holds and holds a five-stage brazed flow path plate 30 between the upper body 41. . The spacer leg 41S regulates the tightening distance between the upper body 41 and the lower body 42. Each brazing flow path plate 30 has the same structure except for the uppermost and lowermost brazing flow path plates 30.

  1 to 6 show a specific embodiment of the brazing flow path plate 30. Each brazing flow path plate 30 is composed of a pair of brazing plates 34U and 34L that are joined together in an overlapping manner. As schematically shown in FIG. 11, the brazing plates 34U and 34L include a sheet core material 3a made of a metal material (generally an aluminum alloy) and a brazing material 3b formed to adhere to the front and back of the sheet core material 3a. The flow path recess can be formed by press working, and the brazing material 3b is melted and bonded to each other by heating under pressure with a pair in contact. Generally, the brazing plate 34U (34L) has a thickness of about 0.2 mm, and the thickness can be changed as necessary, and the configuration of the brazing sheet is not limited in the present invention.

  Each brazing plate 34 </ b> U (34 </ b> L) has an elongated shape, and has a flat U-shaped channel recess 36 on a flat bonding facing surface 35. An inlet hole 31 and an outlet hole 32 are formed at both ends of the U-shaped channel recess 36 (the end opposite to the U-shaped folded portion). The inlet hole 31 and the outlet hole 32 are formed in a spacer portion 37 and a spacer 38 portion formed on the brazing plate 34U (34L) so as to protrude outward from the U-shaped channel recess 36 portion. The brazing plate 34U (34L) is provided with another spacer protrusion 39 having the same height as that of the spacer portion 37 (38) so as to be positioned on the opposite side of the spacer portion 37 (38).

  The brazing plate 34U (34L) is formed with a wedge-shaped recess 5 which is located on both sides in the extending direction of the U-shaped flow path recess 36 and has a wedge shape with respect to the plane of the bonding facing surface 35. As shown in an enlarged view in FIG. 4, the wedge-shaped concave portion 5 has a small angle with the steep angle wedge portion 5 a having a large angle with respect to the adhesion facing surface 35 in order from the center side of the U-shaped channel concave portion 36. The wedge portion 5b has a gentle angle, and both wedge portions are connected with a smooth curved surface.

  In addition, the pair of brazing sheets 34U (34L) communicate with the inlet hole 31 and the outlet hole 32 and face in the opposite direction to the U-shaped channel recess 36 (liquid channel 33), regardless of the channel. The brazing material accommodating recess 2a (not shown in FIG. 7 and FIG. 8) is formed.

  The above brazing plates 34U and 34L are overlapped with each other so that the U-shaped flow path recess 36 faces outward, and joined by heating with the bonding facing surfaces 35 in contact with each other. Then, the coolant flow path 33 is formed by the U-shaped flow path recesses 36 that protrude in the opposite directions of the upper and lower sides. As shown in FIG. 8, the coolant channel 33 has a flat shape, and on both sides in the extending direction of the coolant channel 33, the front and back wedge-shaped recesses 5 (the steep angle wedge portion 5a and A wedge-shaped space 6 is formed by the gentle-angle wedge portion 5b). As shown in FIG. 4 and FIG. 6 with hatching, the wedge-shaped space 6 contains a brazing material 3b that melts when the brazing plates 34U and 34L are heat-bonded, and at the same time, a pair of opposing brazing material storage recesses. Since the brazing material storage space 2 is formed by 2a and the brazing material 3b enters the brazing material storage space 2, the coolant channel 33 is hardly blocked.

  In addition, the spacer portions 37 (38) of the upper and lower brazing flow path plates 30 are in contact with each other so that the inlet holes 31 and the outlet holes 32 of the upper and lower brazing flow path plates 30 communicate with each other. And a part of the outlet line 24 is constructed. An inlet hole 31 (outlet hole 32) is not formed in the spacer portion 37 (38) of the brazing plate 34L below the lowermost brazing flow path plate 30. By not drilling both holes 31, 32, the lowermost brazing plate 34L can be obtained. When the spacer portions 37 (38) of the upper and lower brazing flow path plates 30 are in contact with each other, the spacer protrusions 39 of the upper and lower brazing flow path plates 30 are simultaneously brought into contact with each other so as to be U-shaped. A cooling air passage space S is formed between the channel-shaped channel recesses 36 (coolant channel 33).

  In FIG. 4, the brazing plates 34U and 34L have the same (symmetric) shape. However, as shown in FIG. 5, the gentle-angle wedge portion 5b may be formed only on one brazing plate 34U. According to this embodiment, the wedge-shaped space 6 can be further narrowed, and the entry of the brazing material by the capillary phenomenon can be promoted.

  7 and 8 show another embodiment of the brazing flow path plate 30 according to the present invention. In this embodiment, a part of the coolant channel 33 (U-shaped channel recess 36), that is, in the illustrated embodiment, the U-shaped bent portion is shown in FIG. It is formed wider than the portion, and the wide portion is used as a brazing material storage space 7. The brazing material 3 b that melts when the brazing plates 34 </ b> U and 34 </ b> L are bonded by heating hardly enters the brazing material storage space 7 and blocks the coolant flow path 33.

  9 and 10 show an embodiment in which the distance t between the opposing surfaces of the pair of brazing sheets 34U and 34L in the brazing material storage space 7 is set narrower than the distance T between the other flow path portions. According to this embodiment, the entry of the brazing material by capillary action can be further promoted.

  In the above embodiment, the wedge-shaped recess 5 (wedge-shaped space) is formed on the brazed flow path plate 30 (brazing plate 34U (34L)) on both sides in the extending direction of the U-shaped flow path recess 36. A constant brazing material storage effect can be expected with either one. In addition, although one U-shaped flow path is formed in each brazed flow path plate 30 (brazing plate 34U (34L)), a flow path that is S-shaped or folded several times can be formed. Furthermore, since the spacer protrusion 39 is provided on the opposite side of the spacer portion 37 (38) in the length direction of the brazing plate 34U (34L), the interval between the brazing flow path plates 30 can be maintained in a well-balanced manner. Although there is an advantage, spacer protrusions may be provided in another part, and the spacer protrusions 39 may be omitted if the interval between the brazing flow path plates 30 can be maintained.

It is a top view which shows one Embodiment of the brazing flow path plate of this invention. It is a side view which shows embodiment which piled up the brazing flow path board 5 steps | paragraphs. It is sectional drawing which follows the III-III line of FIG. FIG. 4 is an enlarged cross-sectional view of a part IV in FIG. 3. It is sectional drawing corresponding to FIG. 3 which shows another embodiment of the brazing flow path board of this invention. FIG. 2 is a partially enlarged view of FIG. 1. It is a top view which shows another embodiment of the brazing flow path board by this invention. It is sectional drawing which follows the VIII-VIII line of FIG. It is a top view which shows another embodiment of the brazing flow path board by this invention. It is sectional drawing which follows the XX line of FIG. It is a conceptual sectional view of a brazing plate. It is a perspective view of the radiator which piled up five steps of brazing flow path plates. It is a conceptual diagram of the cooling system containing a brazing flow path plate.

Explanation of symbols

30 Brazing flow path plate 31 Inlet hole 32 Outlet hole 33 Coolant flow path (flow path)
34U 34L Brazing plate 35 Adhesive facing surface 36 U-shaped flow path recess 37 38 Spacer portion 39 Spacer projection 3a Core material 3b Brazing material 5 Wedge-shaped recess 5a Steep angle wedge portion 5b Slow angle wedge portion 6 Wedge-shaped space 7 Brazing material storage space S Cooling air passage space

Claims (12)

A brazing sheet having a sheet core material made of a metal material and a brazing material attached to the front and back surfaces of the sheet core material is bonded as a pair of front and back surfaces, and is flown by a recess formed on at least one of the bonding facing surfaces of the brazing sheet. In the brazing flow path plate forming the path,
A brazing flow path plate, wherein a wedge-shaped space into which a brazing material enters by capillarity is formed on at least one side in the extending direction of the flow path on an adhesive facing surface of the pair of brazing sheets. . 2. The brazing channel plate according to claim 1, wherein the wedge-shaped channel includes a slow-angle wedge portion having a small angle with respect to the bonding facing surface and a steep-angle wedge portion having the same angle. Board. The brazed flow path plate according to claim 1 or 2, wherein the flow path of the pair of brazing sheets has a symmetrical shape with respect to the adhesion facing surface. The brazing flow path plate according to claim 1 or 2, wherein the gentle-angle wedge portion is formed on only one of a pair of brazing sheets. A brazing sheet having a sheet core material made of a metal material and a brazing material attached to the front and back surfaces of the sheet core material is bonded as a pair of front and back surfaces, and is flown by a recess formed on at least one of the bonding facing surfaces of the brazing sheet. In the brazing flow path plate forming the path,
A brazed flow path plate, wherein a part of the flow path is formed wider than the flow path width of the other part, and the wide part is used as a brazing material storage space. The brazing flow path plate according to claim 5, wherein the flow path has a bent portion, and the brazing material storage space is formed in the bent portion. The brazing flow path plate according to claim 6, wherein the flow path has a bent portion, and the brazing material storage space is formed in the bent portion. The brazing flow path plate according to claim 5 or 6, wherein an interval between opposing surfaces of the pair of brazing sheets in the brazing material storage space is set to be narrower than the same interval between other flow path portions. . The brazed flow path plate according to any one of claims 1 to 8, wherein the flow path formed by the pair of brazing sheets is bent at least once into a U shape, A brazed flow path plate having fluid inlet holes and outlet holes formed at both ends. 10. The brazing flow path plate according to claim 9, wherein the pair of brazing sheets are connected to the inlet hole and the outlet hole so that the brazing material is stored in a direction opposite to the flow path connecting the inlet hole and the outlet hole. Brazed flow path plate in which a space is formed. The brazing flow path plate according to claim 9 or 10, wherein the pair of brazing sheets have spacer portions protruding outward at the inlet hole and the outlet hole portions, and the spacer portions of the brazed flow path plate overlapped with each other. Are brazed flow path plates that form an air passage space in the remaining portions of the brazed flow path plates that are in contact with each other. 12. The brazed flow path plate according to claim 8, wherein a pair of brazing sheets are in contact with each other when a plurality of brazed flow path plates are overlapped, and a space is formed between the brazed flow path plates. A brazing flow path plate in which spacer protrusions for ensuring the above are integrally formed.