JP2010117040A - Cooling member and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling member capable of realizing excellent heat transfer from a heat transfer member to a refrigerant introducing tube and securing the excellent flow of refrigerant introduced to the refrigerant introducing tube, even though a dimension error is included in the circumferential length of the outer periphery of the refrigerant introducing tube or an inner peripheral surface of a groove, and its manufacturing method. <P>SOLUTION: In the groove part 1, the curvature center O of its inner peripheral surface 17 is positioned inside a groove opening 3. The circumferential length L of the inner peripheral surface 17 is the length of the inner peripheral surface 17 from a corner 19 to a corner 21. The groove part 1 satisfies a condition that a length obtained by adding a width A of the groove opening 3 and the circumferential length L of the inner peripheral surface 17 (A+L) is shorter than the outer periphery (πG) of the refrigerant introducing tube 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooling member formed by press-fitting a refrigerant introduction pipe into a groove portion of a heat transfer member, and a manufacturing method thereof.

  Techniques for joining a pipe or the like to the groove portion of the heat transfer member are disclosed in the following patent documents. When manufacturing a cooling member formed by press-fitting a refrigerant introduction pipe into the groove portion of the heat transfer member, as shown in FIG. 6A, a diameter φ is formed in the groove portion 107 having a groove port 105 opened on the surface 103 of the heat transfer member 101. The refrigerant introduction pipe 109 is made to enter, and the refrigerant introduction pipe 109 is pressed against the groove 107 using the pressing die 111. As a result, the refrigerant introduction pipe 109 is plastically deformed so as to be in close contact with the inner peripheral surface of the groove 107 as shown in FIG.

  Further, since the outer circumference (πφ) of the refrigerant introduction pipe 109 and the circumferential length L of the inner circumferential surface of the groove 107 each include a dimensional error, the refrigerant introduction pipe 109 is connected to the groove 107 as shown in FIG. May not be in close contact with the inner peripheral surface, and a gap may remain between the two. In this case, heat transfer from the heat transfer member 101 to the refrigerant introduction pipe 109 is hindered. Further, when a torsional external force is applied to the refrigerant introduction pipe 109, there occurs a problem that the refrigerant introduction pipe 109 rotates with respect to the heat transfer member 101. Alternatively, as shown in FIG. 4D, the refrigerant introduction pipe 109 that is forced into the groove 107 may be bent in a valley shape. In this case, the cross-sectional area inside the refrigerant introduction pipe 109 becomes narrow, and the flow of the refrigerant introduced into the refrigerant introduction pipe 109 is hindered.

However, since the heat transfer member 101 and the refrigerant introduction pipe 109 are different from each other in manufacturing process, it is difficult to manage the dimensions of both in a unified manner, and the quality of the cooling member becomes unstable as described above. Inevitable.
JP 2007-218439 A JP 2005-90794 A Japanese Patent Laid-Open No. 10-79586

  The present invention can realize good heat transfer from the heat transfer member to the refrigerant introduction pipe even if the outer circumference of the refrigerant introduction pipe or the circumferential length of the inner peripheral surface of the groove portion includes a dimensional error, and further to the refrigerant introduction pipe. It aims at providing the cooling member which can ensure the favorable flow of the introduce | transduced refrigerant | coolant, and its manufacturing method. A further object of the present invention is to provide a cooling member that can hold the refrigerant introduction tube firmly to the heat transfer member against a torsional external force applied to the refrigerant introduction tube, and a method for manufacturing the same.

  In order to achieve the above object, the present invention provides a cooling member in which a refrigerant introduction tube is press-fitted into a groove portion having a groove opening on a surface of a heat transfer member, and the groove portion has a center of curvature of an inner peripheral surface of the groove opening. A length obtained by adding the circumferential length of the inner circumferential surface to the width of the groove opening is shorter than the outer circumference of the refrigerant introduction tube, and the refrigerant introduction tube is a circumferential curve closely contacting the inner circumferential surface. And a planar portion that closes the groove and protrudes from the surface.

  Further, the present invention provides a shape in which the center of curvature of the inner peripheral surface is located inward of the groove opening, and the length obtained by adding the peripheral length of the inner peripheral surface to the width of the groove opening is shorter than the outer periphery of the refrigerant introduction pipe With respect to the heat transfer member having the groove portion, a refrigerant introduction tube is inserted into the groove portion, and the refrigerant introduction tube is plastically deformed so as to be in close contact with the inner peripheral surface by a pressing die that presses the refrigerant introduction tube against the groove portion. It is characterized by that.

  The cooling member according to the present invention is manufactured by the following method. That is, the refrigerant introduction tube is inserted into the groove portion of the heat transfer member, and the refrigerant introduction tube is pressed against the groove portion with a pressing die. As a result, when the refrigerant introduction pipe that is plastically deformed comes into close contact with the inner peripheral surface of the groove, the refrigerant introduction pipe does not completely immerse into the groove opening of the groove. At the same time, since the entire width of the refrigerant introduction pipe is wider than the groove opening, the joining of the heat transfer member and the refrigerant introduction pipe is completed.

  Therefore, according to the manufacturing method of the cooling member according to the present invention, the heat transfer member and the refrigerant introduction tube are not affected even if dimensional errors are included in the outer circumference of the refrigerant introduction tube and the circumferential length of the inner circumferential surface of the groove. At the time of joining, there is no gap left between them. For this reason, the cooling member manufactured by the cooling member according to the present invention can realize good heat transfer from the heat transfer member to the circumferentially curved portion of the refrigerant introduction pipe.

  Further, in the cooling member according to the present invention, if the pressing force of the pressing die against the refrigerant introduction pipe is set to such an extent that the refrigerant introduction pipe does not completely enter the groove portion, the refrigerant introduction pipe can be bent with an excessive force. It is possible to prevent and form a planar portion in the refrigerant introduction pipe. For this reason, since the reduction of the cross-sectional area due to plastic deformation of the refrigerant introduction pipe can be suppressed, the cooling member manufactured by the cooling member according to the present invention can secure a good flow of the refrigerant introduced into the refrigerant introduction pipe. is there.

  Embodiments of a cooling member and a manufacturing method thereof according to the present invention will be described. FIG. 1A shows a heat transfer member 7 having a groove port 3 of a groove portion 1 opened to a surface 5, a pressing die 11 having a flat pressing surface 9 facing the groove portion 1, and a refrigerant introduction pipe inserted into the groove portion 1. 13 is shown. The stamp 11 is attached as a tool to a ram of a press machine not shown in the drawing. The cooling member 15 can be manufactured by plastically deforming the refrigerant introduction tube 13 as shown in FIG. Details are described below.

  As shown in FIG. 2, the groove portion 1 has the center of curvature O of the inner peripheral surface 17 positioned inward of the groove opening 3. The two corners 19 and 21 are locations where the inner peripheral surface 17 that curves along an ellipse and the inner side surface 23 of the groove 3 are adjacent to each other. The peripheral length of the inner peripheral surface 17 means the length of the inner peripheral surface 17 extending from the corner portion 19 to the corner portion 21, but in this embodiment, the thickness E from the corner portion 19 to the surface 5 and the corner portion 21. To the surface 5 is added. Therefore, when the peripheral length of the inner peripheral surface 17 is L, A + L + 2E <πG, and the groove portion 1 has a length (A + L) obtained by adding the peripheral length of the inner peripheral surface 17 to the width A of the groove opening 3. The condition of being shorter than the outer periphery (πG) is satisfied.

  Table 1 shows dimensions A to G. In the following, it is assumed that the units of dimensions are all [mm]. The procedure for calculating the dimensions A to G will be described by taking as an example a case where the diameter of the refrigerant introduction tube 13 is 9.52 and includes an error of ± 0.08. First, A = 9.7 ± 0.1 so that the width A of the groove port 3 is not less than the maximum value 9.60 of the diameter of the refrigerant introduction tube 13. The maximum value Amax of the width A of the groove opening 3 is 9.8. Equation 1 is set so that the overhang amount obtained by dividing the difference between the maximum value Amax and the minimum value Bmin of the entire width B of the inner peripheral surface 17 which is the major axis of the ellipse by at least 0.4 (about 4% of A). Based on the above, Bmin = 10.6 is calculated. If the error when the groove 1 is formed on the heat transfer member 7 is estimated to be ± 0.1, the value of B can be set to 10.7 ± 0.1.

  Subsequently, assuming that the thickness E = 0.44, the calculated value of the peripheral length of the inner peripheral surface 17 when the minor axis of the ellipse in contact with both the corners 19 and 21 is changed is obtained. FIG. 3 is a graph in which the half minor axis corresponding to half of the minor axis of the ellipse is represented on the horizontal axis, and the calculated value of the peripheral length of the inner peripheral surface 17 is represented on the vertical axis. Since the minimum value of the outer periphery (πG) of the refrigerant introduction pipe 13 is about 29.7, the condition that the peripheral length of the inner peripheral surface 17 is shorter than this minimum value is that the elliptical semi-short diameter is the broken line in the figure. It is to be below the divided value. For example, when πG <29, C <4.

  The manufacturing method of the cooling member 15 is as follows. The drawings refer to FIGS. 1A and 1B unless otherwise specified. First, the refrigerant introduction tube 13 inserted into the groove portion 1 of the heat transfer member 7 is pressed against the groove portion 1 with the pressing die 11, thereby bringing the plastically deformed refrigerant introduction tube 13 into close contact with the inner peripheral surface 17 of the groove portion 1. At this time, the refrigerant introduction tube 13 does not completely immerse in the groove opening 3 of the groove portion 1. This is because part of the refrigerant introduction pipe 13 protrudes from the surface 5 of the heat transfer member 7 because the length obtained by adding the circumferential length of the inner peripheral surface 17 to the width of the groove 3 is shorter than the outer circumference of the refrigerant introduction pipe 13. It is to do. Further, the center of curvature O of the groove portion 1 is located inside the heat transfer member 7 rather than the groove opening 3. For this reason, when the refrigerant introduction pipe 13 is in close contact with the inner peripheral surface 17 of the groove portion 1 as described above, the width of the refrigerant introduction pipe 13 becomes wider than the groove opening 3, and the refrigerant introduction pipe 13 from the heat transfer member 7 Since the separation is restricted, the joining of the heat transfer member 7 and the refrigerant introduction pipe 13 is completed.

  Therefore, according to the method described above, since the refrigerant introduction tube 13 is in close contact with the inner peripheral surface 17 of the groove portion 1 with the refrigerant introduction tube 13 protruding from the surface 5 of the heat transfer member 7, the refrigerant introduction tube Even if the outer circumference of 13 and the circumferential length of the inner circumferential surface 17 of the groove portion 1 include dimensional errors, a gap remains between the heat transfer member 7 and the refrigerant introduction pipe 13 when they are joined. There is no. For this reason, the cooling member 15 can realize good heat transfer from the heat transfer member 7 to the circumferentially bent portion 25 of the refrigerant introduction pipe 13. The circumferentially bent portion 25 is a portion where the refrigerant introduction tube 13 is plastically deformed into an elliptical shape following the inner peripheral surface 17 of the groove portion 1. Furthermore, since the cross section of the inner peripheral surface 17 is an ellipse having a major axis along the width direction of the groove 3, the refrigerant introduction pipe 13 is connected to the heat transfer member 7 against the external force in the twist direction applied to the refrigerant introduction pipe 13. Can be held firmly.

  Further, in the method described above, the pressing die 11 presses the refrigerant introduction pipe 13 without causing the refrigerant introduction pipe 13 to be completely immersed in the groove portion 1, so that the refrigerant introduction pipe 13 is connected from the surface 5 to the refrigerant introduction pipe 13. Since it is set so as to protrude, it is possible to prevent the refrigerant introduction pipe 13 from being bent by an excessive force, and to form the planar portion 27 in the refrigerant introduction pipe 13. The planar portion 27 is a portion where the refrigerant introduction tube 13 is plastically deformed into a flat shape following the pressing surface 9 of the pressing die 11.

  4 shows the dent ratio obtained by dividing the dent amount Δt of the planar portion 27 by the ellipse major axis B (full width of the inner peripheral surface 17) on the horizontal axis, and flows through the refrigerant introduction pipe 13 as the dent ratio increases. It is the graph which represented on the vertical axis | shaft the ratio which the pressure loss of a refrigerant | coolant increases as a pressure loss increase rate. From the graph, it can be seen that in order to make the pressure loss increase rate 3 or less, it is necessary to suppress the dent rate to 0.3 or less. In order to achieve this, the pressing force of the pressing die 11 against the refrigerant introduction tube 13 is such that the height t at which the planar portion 27 protrudes from the surface 5 of the heat transfer member 7 is smaller than the thickness of the refrigerant introduction tube 13. It has been adjusted to be.

  It should be noted that the present invention can be implemented in a mode in which various improvements, modifications, or variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. For example, the cross section of the inner peripheral surface 17 is not limited to an ellipse, and may be an oval shape having a major axis along the width direction of the groove 3 as shown in FIG. In this case, the inner peripheral surface 17 of the groove portion 1 may have a shape in which the arc portion 19 and the linear bottom surface 21 are combined. Further, as shown in FIG. 5B, the number of curvature centers O of the inner peripheral surface 17 may be two or more.

  The present invention is a technique useful for manufacturing a cooling member for cooling a heat generating electrical component such as a power module.

(A) is sectional drawing which shows the process example of the manufacturing method of the cooling member which concerns on embodiment of this invention, (b) is sectional drawing of the cooling member manufactured by the method. Explanatory drawing which contrasted the refrigerant introduction pipe with the dimension of the groove part of the heat-transfer member applied to the manufacturing method of the cooling member which concerns on embodiment of this invention. The graph which represented the semi-minor axis of the groove part of the heat-transfer member applied to the manufacturing method of the cooling member which concerns on embodiment of this invention on the horizontal axis, and represented the calculated value of the circumference of the internal peripheral surface on the vertical axis | shaft. The graph which expressed on the horizontal axis the dent ratio of the refrigerant introduction pipe plastically deformed by the manufacturing method of the cooling member concerning the embodiment of the present invention, and expressed the rate which the pressure loss of a refrigerant increases with the increase of the dent ratio on the vertical axis. (A), (b) is sectional drawing which shows each the modification of the heat-transfer member applicable to the manufacturing method of the cooling member which concerns on embodiment of this invention. (A) is sectional drawing which shows the process of manufacturing the cooling member of a prior art example, (b)-(d) is sectional drawing which each shows the example of the cooling member manufactured by the method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Groove part, 3 ... Groove opening, 5 ... Surface, 7 ... Heat-transfer member, 11 ... Stamping die, 13 ... Refrigerant introduction pipe, 15 ... Cooling member, 17 ... Inner peripheral surface, 25 ... Circumferential curved part, 27 ... Planar part .

Claims (2)

  A cooling member in which a coolant introduction pipe is press-fitted into a groove portion having a groove opening opened on a surface of the heat transfer member, the groove portion being located at the center of curvature of the inner peripheral surface of the groove opening and in the groove opening. The length obtained by adding the peripheral length of the inner peripheral surface to the width is shorter than the outer periphery of the refrigerant introduction tube, and the refrigerant introduction tube closes the groove portion close to the inner peripheral surface and the groove opening from the surface. A cooling member comprising a projecting planar portion.   Heat transfer having a groove portion in which the center of curvature of the inner peripheral surface is positioned inward of the groove opening and the length obtained by adding the peripheral length of the inner peripheral surface to the width of the groove opening is shorter than the outer periphery of the refrigerant introduction pipe Cooling, wherein a coolant introduction tube is inserted into the groove portion with respect to the member, and the coolant introduction tube is plastically deformed so as to be in close contact with the inner peripheral surface by a pressing die that presses the coolant introduction tube against the groove portion. Manufacturing method of member.

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