JP5264852B2 - Cooling pipe joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling pipe joint structure for improving cooling efficiency of a water-cooled heat radiation mechanism including a radiation fin and improving cooling capacity of the heat radiation mechanism without increasing the scale of the water-cooled heat radiation mechanism. <P>SOLUTION: In cooling water (Ca) supplied from a water supply pipe 5, cooling water (Ca) flowing into an inner pipe joint 17B is pressurized by a tapered part 172 formed in the inner pipe joint 17B to increase the flow rate and supplied as secondary cooling water (Ca2) to a secondary cooling pipe 12. By accelerating the secondary cooling water (Ca2), the secondary cooling water (Ca2) absorbing heat from a primary cooling pipe 11 where the primary cooling water (Ca1) flows is accelerated and quickly drained in the cooling pipe structure 10, and thereby, reduction in the cooling capacity due to the temperature difference in the primary cooling water (Ca1) can be suppressed. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

    The present invention relates to a cooling pipe joint structure suitable for application to, for example, a water-cooled heat dissipation mechanism used for cooling a heating element such as a power semiconductor element.

  In equipment equipped with a water-cooled heat dissipation mechanism that dissipates heat generated from power semiconductor elements by a water-cooled heat dissipation fin, conventionally, a through-hole of a cooling pipe is provided in the heat dissipation fin, and a cooling pipe (single pipe) is provided in this through-hole The water-cooled heat dissipation mechanism was configured. This heat dissipating mechanism has a structure in which the cooling water passes straight through the straight cooling pipe inscribed through the heat dissipating fin, and heat exchange between the heat dissipating fin and the cooling water It is performed between the inner wall of the cooling pipe that penetrates and the cooling water that touches this inner wall, and the cooling water fills the inside of the cooling pipe, so the cooling water is drained without efficient heat transfer to the entire cooling water, There was a problem that the cooling capacity of the supplied cooling water was not fully utilized. In addition, before and after the cooling pipe that penetrates the radiating fins (water supply side and drainage side), the temperature of the cooling water passing through the pipe is higher on the drainage side that absorbs heat than on the water supply side. There was a problem that the temperature of the heat-radiating fin on the drainage side did not decrease sufficiently.

  Therefore, the present inventors have a straight outer tube, an inner tube inserted into the outer tube with a certain gap from the inner wall of the outer tube, and the same pressure applied to the outer tube and the inner tube. Cooling water supply means for commonly supplying cooling water, support means for supporting the inner pipe in the outer pipe, and a flow rate of the cooling water flowing in the inner pipe with respect to a flow speed of the cooling water flowing in the outer pipe. A cooling pipe structure equipped with a speed control means for speeding up was developed.

  When configuring a water-cooled heat dissipation mechanism using this cooling pipe structure, since the cooling pipe structure is a so-called double pipe structure, the outer pipe and the inner pipe piped in the outer pipe are to be joined. Therefore, it was necessary to develop a joint structure that was easy to pipe and excellent in workability and economy.

  Conventionally, as a joint of a double pipe structure having an outer pipe and an inner pipe piped in the outer pipe, a cylindrical engagement that locks the first and second double pipes by elastic deformation on the outer periphery of the joint. A stop member is provided, each pipe of the double pipe has a fitting mechanism, and the first and second double pipes are locked to the joint by the locking member, and the first and second joints are connected to the joint. There are joint structures that join double pipes (see Patent Document 1) and joint structures that lead out the inner pipe to the outside of the outer pipe and join the inner pipe and outer pipe individually (see Patent Documents 2 and 3). Were present.

  Among these, the joint structure for locking the first and second double pipes to the joint by the locking member is provided with a locking member that is elastically deformed on the outer peripheral part of the joint, and the joint part of the inner pipe and the outer pipe Since it is necessary to provide a unique fitting mechanism for each, there is a problem in that the joint structure becomes complicated and large in size and maintains a reliable and strong joint state. In addition, the joint structure in which the inner pipe is led out of the outer pipe and the inner pipe and the outer pipe are individually joined requires a structure for leading the inner pipe out of the outer pipe. In addition, a special manufacturing technique for leading the inner pipe out of the outer pipe is required, and the piping structure including the joint is complicated and enlarged.

  Furthermore, each joint structure is a structure that merely separates the fluid of the outer tube and the inner tube, so that, for example, a water-cooled heat radiation mechanism that radiates heat generated from the power semiconductor element group by a water-cooled heat radiation fin. When applied, there is a temperature difference due to heat absorption between the water supply side and the drain side of the radiating fin cooled by the cooling water flowing in the cooling pipe, and this temperature difference has a detrimental effect on the circuit operation including the semiconductor element to be cooled. In order to solve this problem, there has been a problem that the water-cooled heat dissipating mechanism based on the heat dissipating fins is enlarged.

JP 2004-270928 A JP 2007-177872 A JP 2003-287166 A

  As described above, the cooling pipe joint structure in the water-cooled heat dissipation mechanism using the conventional double pipe is applied to a water-cooled heat dissipation mechanism that radiates heat generated from the power semiconductor element group by the water-cooled heat dissipation fins. There is a problem that a temperature difference due to heat absorption occurs between the water supply side and the drainage side of the radiating fin cooled by the cooling water flowing in the cooling pipe, and this temperature difference adversely affects the circuit operation including the semiconductor element to be cooled. In order to solve this problem, there is a problem that the water-cooled heat dissipating mechanism including the heat dissipating fins is enlarged.

  An object of an embodiment of the present invention is to provide a cooling pipe joint structure capable of improving the cooling efficiency and cooling capacity of a water-cooled heat dissipation mechanism without increasing the size of the water-cooled heat dissipation mechanism including the heat dissipation fins.

An embodiment of the present invention is a cooling pipe joint structure that is used in a water-cooling type heat radiation mechanism that performs heat exchange with a heat radiation fin and is applied to a pipe having a cooling pipe structure, and includes an outer pipe, an inner wall of the outer pipe, The cooling water from the water supply side is provided in the outer pipe with a certain gap, and the inner pipe that flows straight to the drainage side is joined to the water supply side pipe and the outer pipe, and the cooling water is A cylindrical outer pipe joint for supplying water to the outer circumference of the inner pipe and the inner pipe, a constant gap from the inner wall of the outer pipe joint, and a vortex flow to the cooling water flowing on the outer circumference of the inner pipe An inner pipe joint having a spacer to be squeezed , and the outer pipe joint is provided with water as primary cooling water that draws heat from the radiation fins on the outer circumference of the inner pipe from the water supply side pipe. The inner pipe joint is supplied to the inner pipe from the water supply side pipe. The cooling water pressure, characterized in that the feed water as secondary cooling water for cooling the primary coolant robbed the heat.

  According to the embodiment of the present invention, it is possible to provide a cooling pipe joint structure in which the cooling efficiency and the cooling capacity of the water-cooled heat dissipation mechanism are improved without increasing the size of the water-cooled heat dissipation mechanism including the radiation fins.

The perspective view which made the longitudinal cross-section part which shows the structure of the cooling pipe structure used as the connection object of the cooling pipe joint structure which concerns on embodiment of this invention with the flow of cooling water. The cross-sectional view which shows the structure of the said cooling pipe structure. The figure which shows the arrangement configuration example of the spacer of the said cooling pipe structure. The figure which shows the basic composition which attached the said cooling pipe structure to the radiation fin. The figure which shows the internal structure of the cooling pipe structure shown in FIG. The figure for demonstrating the heat exchange of the said cooling pipe structure. The figure which shows the flow of the cooling water in FIG. The figure which shows the 1st structural example of the cooling pipe joint structure which concerns on embodiment of this invention. The figure which shows the 2nd structural example of the cooling pipe joint structure which concerns on the said embodiment. The longitudinal cross-sectional view which shows the structure of the joint part shown in FIG. The figure which shows the 1st structural example of piping which applied the cooling pipe joint structure which concerns on the said embodiment. The figure which shows the 2nd structural example of piping which applied the cooling pipe joint structure which concerns on the said embodiment. The figure which shows the 3rd structural example of the cooling pipe joint structure which concerns on the said embodiment. FIG. 14 is a longitudinal sectional view showing a configuration of a joint portion shown in FIG. 13. The figure which shows the 4th structural example of the cooling pipe joint structure which concerns on the said embodiment. The perspective view for demonstrating the flow of the cooling water of the joint part shown in FIG. The side view for demonstrating the flow of the cooling water of the joint part shown in FIG. The perspective view which expands and partially shows the structural example of the other cooling pipe structure used as the connection object of the cooling pipe joint structure which concerns on the said embodiment. FIG. 19 is a cross-sectional view showing the configuration of the cooling pipe structure shown in FIG. 18. The top view which shows the 1st structural example of the water cooling type thermal radiation mechanism to which the cooling pipe joint structure which concerns on the said embodiment is applied. The front view which shows the structure of the water cooling type thermal radiation mechanism shown in FIG. The top view which shows the 2nd structural example of the water cooling type thermal radiation mechanism to which the cooling pipe joint structure which concerns on the said embodiment is applied. The front view which shows the structure of the water cooling type thermal radiation mechanism shown in FIG. The perspective view which shows the 1st structural example of the inner pipe part of the cooling pipe joint structure which concerns on the said embodiment. The perspective view which shows the 2nd structural example of the inner pipe part of the cooling pipe joint structure which concerns on the said embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a configuration of a cooling pipe structure that is a target for joining a cooling pipe joint structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

  In this cooling pipe structure, a cooling pipe (secondary cooling pipe) for cooling the cooling water (primary cooling water) in the cooling pipe (primary cooling pipe) is arranged in the primary cooling pipe, and the primary cooling pipe is placed in the secondary cooling pipe. By supplying cooling water for cooling water (secondary cooling water) and increasing the flow rate of the secondary cooling water faster than the flow rate of the primary cooling water, the absorbed secondary cooling water can be drained quickly, so that the primary cooling water is discharged. In addition to reducing the cooling capacity of the primary cooling water, the vortex was generated in the flow of the primary cooling water to achieve efficient heat exchange between the primary cooling pipe and the primary cooling water and between the primary cooling water and the secondary cooling pipe. .

  FIG. 1 is a perspective view of a basic configuration in which some components of the cooling pipe structure are cut out, and a part of the cooling pipe structure showing a flow of the cooling water in a longitudinal section. FIG. 2 is a cross-sectional view showing the configuration of the cooling pipe structure. 3 is a diagram showing an example of the arrangement configuration of spacers in the cooling pipe structure, FIG. 4 is a diagram showing a basic configuration in which the cooling pipe structure is attached to a heat radiating fin, and FIG. 5 is an internal configuration of the cooling pipe structure shown in FIG. FIG.

  The cooling pipe structure 10 is used for a water-cooling type heat radiation mechanism for exchanging heat with the heat radiation fins, and has a straight outer tube 11 provided through the heat radiation fins 20, and the inner wall of the outer tube 11 is constant. The inner pipe 12 provided coaxially in the outer pipe 11 with a gap between them, and the supply of cooling water (Ca) for commonly supplying the same pressure of cooling water to the outer pipe 11 and the inner pipe 12 Means and a drift surface for supporting the inner tube 12 in the outer tube 11 and generating a vortex (WP) along the outer periphery of the inner tube 12 with respect to the cooling water (Ca1) flowing in the outer tube 11 A plurality of spacers 13 (13a to 13c) having (DF) and flowing in the inner pipe 12 (secondary cooling water flow path 12a) with respect to the flow rate of the cooling water (Ca1) flowing in the outer pipe 11. The flow rate of the cooling water (Ca2) is increased, and the radiating fin 20 and the heat are added to the outer tube 11. A primary cooling water (Ca1) flow path 11a for exchange is formed, and a secondary cooling water (Ca2) flow path 12a for cooling the primary cooling water (Ca1) is formed in the inner pipe 12. To do. In this embodiment, the outer pipe indicated by reference numeral 11 is referred to as a primary cooling pipe, and the inner pipe indicated by reference numeral 12 is referred to as a secondary cooling pipe. Further, the flow path of primary cooling water (Ca1) indicated by reference numeral 11a is referred to as a primary cooling water flow path, and the flow path of secondary cooling water (Ca2) indicated by reference numeral 12a is referred to as a secondary cooling water flow path.

  The primary cooling pipe 11 constituting the outer pipe is constituted by a cylindrical straight pipe using, for example, a copper pipe, and is provided so as to penetrate the radiating fins 20. The radiating fin 20 is made of a metal material having a thickness larger than the diameter of the primary cooling pipe 11 and having a high thermal conductivity (for example, a rectangular parallelepiped metal made of aluminum). The primary cooling pipe 11 is provided with a through hole 21 for insertion of the primary cooling pipe formed between the side surface portion and the outer peripheral surface of the primary cooling pipe 11 in surface contact with the inner peripheral surface of the through hole 21. The heat radiating fins 20 are inserted. A semiconductor element 31 serving as a heating element is mounted on the radiation fin 20, and a heat conduction path is formed between the semiconductor element 31 and the primary cooling pipe 11 via the radiation fin 20.

  The secondary cooling pipe 12 constituting the inner pipe is constituted by a straight pipe similar to the outer pipe 11 and is piped in the primary cooling pipe 11 with a certain gap from the inner wall of the straight primary cooling pipe 11. Has been. In this embodiment, a secondary cooling pipe holding spacer 13 that maintains a constant gap with the inner wall of the primary cooling pipe 11 is provided on the outer periphery of the secondary cooling pipe 12. The secondary cooling pipe 12 is piped in the primary cooling pipe 11 while being held coaxially with the primary cooling pipe 11.

  The secondary cooling pipe holding spacer 13 vortexes the primary cooling water (Ca1) supplied to the primary cooling water flow path 11a and causes the outer periphery of the secondary cooling pipe 12 to flow spirally, thereby moving straight through the secondary cooling water flow path 12a. A time difference (flow path difference) is given to the water flow from the supply water to the drainage with respect to the primary cooling water (Ca2), and thereby the secondary cooling water flow path with respect to the flow rate of the primary cooling water (Ca1) flowing through the primary cooling water flow path 11a. The flow rate control means for increasing the flow rate of the secondary cooling water (Ca2) flowing through 12a is realized. The secondary cooling pipe holding spacer 13 has three blades having a drift surface (DF) that generates a vortex (WP) with respect to the cooling water (Ca1) flowing in the primary cooling pipe 11 (primary cooling water flow path 11a). The spacer members 13a, 13b, and 13c are provided as a set, and the three spacer members 13a to 13c are provided as a set and are wound around the outer periphery of the secondary cooling pipe 12 in a spiral manner. The secondary cooling pipe holding spacers 13 are provided at a plurality of locations in the secondary cooling pipe 12 including at least the water supply side and the drainage side. Each of the spacer members 13a, 13b, and 13c has a shape similar to, for example, a blade of a screw, and has a drift surface (DF) and an arc-shaped edge that form a curved surface that causes a vortex. Is provided in contact with the inner wall of the primary cooling pipe 11 as a support point (TP) of the secondary cooling pipe 12 with respect to the primary cooling pipe 11. In this embodiment, since the secondary cooling pipe holding spacer 13 is used as a heat conduction path between the primary cooling water (Ca1) and the secondary cooling pipe 12, the secondary cooling pipe holding spacer 13 is a copper material having a high thermal conductivity. It is configured using.

  Here, with reference to FIG. 6 and FIG. 7, the heat exchange action in the cooling pipe structure 10 having the above-described configuration will be described. FIG. 6 is a view for explaining the heat exchange of the cooling pipe structure 10, and a heat transfer path for explaining the heat exchange action of the heating element (semiconductor element) 31 mounted on the heat radiating fin 20 is denoted by reference numeral 31 h and Reference numerals ta, tb, and tc indicate. In FIG. 6, reference numeral 31 h is a transfer path of heat generated from the semiconductor element 31 serving as a heating element, reference numeral ta is a transfer path of heat from the radiation fins 20 to the cooling pipe structure 10, and reference sign tb is from the primary cooling pipe 11 to the inside of the pipe 11. The heat transfer path to the cooling water (Ca1) flowing through the (primary cooling water flow path 11a), the symbol tc is the cooling water (Ca1) flowing through the primary cooling pipe 11 (primary cooling water flow path 11a) to the secondary cooling pipe 12 ( The heat transfer path to the secondary cooling water (Ca2) flowing through the secondary cooling water flow path 12a) is shown. FIG. 7 shows the primary cooling water (Ca1) flowing through the primary cooling water flow path 11a and the secondary cooling flowing through the secondary cooling water flow path 12a for explaining the heat exchange action of the cooling pipe structure 10 forming the heat transfer path of FIG. It is a figure which shows water (Ca2).

  The water supply side of the primary cooling pipe 11 and the water supply side of the secondary cooling pipe 12 have the same cooling water (Ca) common to each cooling pipe from the water supply side pipe (water supply pipe) through a joint (pipe joint). Supplied with water pressure. The cooling water (Ca) includes primary cooling water (Ca1) flowing in the primary cooling pipe 11 (primary cooling water flow path 11a) and secondary cooling water (Ca2) flowing in the secondary cooling pipe 12 (secondary cooling water flow path 12a). ) And flow to the drain side.

  At this time, the primary cooling water (Ca1) supplied to the water supply side of the primary cooling pipe 11 is guided to the drift surface (DF) of the secondary cooling pipe holding spacer 13 provided on the outer periphery of the secondary cooling pipe 12, It becomes a vortex (WP) and flows in the primary cooling pipe 11 along the outer periphery of the secondary cooling pipe 12 toward the drainage side (progresses toward the drainage side while spiraling around the outer periphery of the secondary cooling pipe 12). .

  The primary cooling water (Ca1) that has become the vortex flow (WP) flows in the primary cooling pipe 11 evenly in the primary cooling pipe 11 and flows toward the drain side on the outer periphery of the secondary cooling pipe 12, and thus becomes a vortex flow (WP). Further, efficient heat exchange is performed in the heat transfer paths ta and tb by the primary cooling water (Ca1). Due to this heat exchange, the primary cooling water (Ca1) has a temperature difference between the primary cooling water (Ca1) on the water supply side and the primary cooling water (Ca1) on the drainage side, and drains from the primary cooling water (Ca1) on the water supply side. The temperature of the primary cooling water (Ca1) on the side increases.

  On the other hand, the secondary cooling water (Ca2) supplied to the water supply side of the secondary cooling pipe 12 goes straight through the pipe and flows to the drain side. With respect to the secondary cooling water (Ca2) flowing through the secondary cooling pipe 12 (secondary cooling water flow path 12a), the primary cooling water (Ca1) flowing through the primary cooling pipe 11 (primary cooling water flow path 11a) is: Since it becomes a vortex (WP) and flows around the outer periphery of the secondary cooling pipe 12 to the drain side, a flow velocity difference is generated between the primary cooling water (Ca1) and the secondary cooling water (Ca2), and the inside of the primary cooling pipe 11 The flow rate control is such that the flow rate of the secondary cooling water (Ca2) flowing in the secondary cooling pipe 12 (secondary cooling water channel 12a) is increased with respect to the flow rate of the primary cooling water (Ca1) flowing in the (primary cooling water channel 11a). Realized.

  By this flow rate control, the secondary cooling water (Ca2) flowing in the secondary cooling pipe 12 (secondary cooling water flow path 12a) with respect to the primary cooling water (Ca1) flowing in the primary cooling pipe 11 (primary cooling water flow path 11a). ) Can be drained quickly, and efficient heat exchange can be performed in the heat transfer path tc. As a result, the decrease in the cooling capacity of the primary cooling water (Ca1) that becomes conspicuous as it goes toward the drainage side can be remarkably reduced, and stable temperature management with almost no temperature difference between the water supply side and the drainage side of the radiating fin 20 is achieved. realizable.

  Thus, the secondary cooling pipe 12 for cooling the primary cooling water (Ca1) in the primary cooling pipe 11 is arranged in the primary cooling pipe 11, and the primary cooling water (Ca1) is supplied to the secondary cooling pipe 12. By supplying the secondary cooling water (Ca2) as cooling water and increasing the flow rate of the secondary cooling water (Ca2) from the flow rate of the primary cooling water (Ca1), the absorbed secondary cooling water (Ca2) is quickly By draining into the water, the decrease in the cooling capacity of the primary cooling water (Ca1) is reduced, and at the same time, a vortex is generated in the flow of the primary cooling water (Ca1), and the primary cooling pipe 11 and the primary cooling water (Ca1) and the primary cooling are generated. Efficient heat exchange between water (Ca1) and the secondary cooling pipe 12 can be realized.

  In addition, the secondary cooling pipe holding spacer 13 functions as a holding spacer that holds the secondary cooling pipe 12 coaxially in the primary cooling pipe 11 and primary cooling that flows in the primary cooling pipe 11 (primary cooling water flow path 11a). Since the structure has a function of generating vortex (WP) in water (Ca1) (progressing to the drainage side while spiraling around the outer periphery of the secondary cooling pipe 12), the blade that creates the vortex with the holding spacer The number of parts and the number of assembling steps can be reduced as compared with a structure in which and are separately provided.

  The secondary cooling pipe holding spacer 13 includes three spacer members 13a, 13b, and 13c each having a drift surface and an arcuate edge substantially perpendicular to the axial direction (length direction) of the secondary cooling pipe 12. A pipe shaft including the water supply side and the water discharge side of the cooling pipe structure 10 in a state of being wound spirally continuously by 120 degrees in the circumferential direction of the pipe with respect to the secondary cooling pipe 12 as a set. The primary cooling pipe 11 is provided at a plurality of locations in the direction with predetermined intervals, and the arcuate partial tips of the spacer members 13a, 13b, 13c serve as support points (TP) for the secondary cooling pipe 12 with respect to the primary cooling pipe 11. Since the secondary cooling pipe 12 is held in the primary cooling pipe 11 in contact with the inner wall of the pipe, that is, the inner pipe holding structure is formed by point contact that is partially provided at intervals in the pipe axis direction. The insertion resistance when inserting the inner tube into the outer tube is reduced. Can, whereby the assembly of the coaxial double tube is very easily realized. Furthermore, since each spacer member 13a, 13b, 13c of the secondary cooling pipe holding spacer 13 acts as a blade that creates a vortex (WP) and also acts as a heat conduction member with the primary cooling water (Ca1), the cooling effect is further increased. Can be increased.

  Various configuration examples of the cooling pipe joint structure having the flow rate control function according to the embodiment of the present invention in which the above-described cooling pipe structure 10 is an object to be joined will be described with reference to FIGS.

  8 to 10 each show a joint structure of the secondary cooling pipe 12 on the water supply side. FIG. 8 shows a screw-type joint structure (joint structure according to the first configuration example), and FIGS. 9 and 10 show a fit-type joint structure (joint structure according to the second configuration example).

  The screw-type joint structure shown in FIG. 8 is provided on the water supply side pipe (water supply pipe) by screw connection in the screwing direction according to the direction of the drift surface (DF) that creates the vortex (WP) of the secondary cooling pipe holding spacer 13. A joint example of the joint 15 and the secondary cooling pipe 12 is shown. In this joint example, in the joint portion between the joint 15 and the secondary cooling pipe 12, threaded portions for screw coupling are formed on the inner peripheral surface of the joint 15 and the outer peripheral surface of the secondary cooling pipe 12, respectively. That is, a threaded portion 15 s for coupling a cooling pipe is provided on the inner peripheral surface of the joint 15, and a threaded portion 12 s for coupling is provided on the outer peripheral surface of the secondary cooling pipe 12.

  The symbol ra in the figure is the direction of rotation of the secondary cooling pipe 12 generated by the force Fa, and is a counterclockwise direction when viewed from the water supply side toward the drainage side, that is, when viewed from the drainage side toward the water supply side. It is the direction around. The rotation direction ra is a direction in which the right screw advances, that is, a direction in which the secondary cooling pipe 12 is screwed to the joint 15. In addition, the joint part of the joint 15 opposite to the joint part of the secondary cooling pipe 12 is joined to a single water supply pipe (see reference numeral 5) shown in FIG.

  In this way, when the secondary cooling pipe 12 and the joint 15 are joined with a right-hand thread, the secondary cooling pipe is held so that a vortex (WP) is generated in the clockwise direction from the water supply side to the drainage side. By forming the drift surface (DF) of the spacer 13, it is possible to avoid the problem that the secondary cooling pipe 12 rotates in the direction opposite to the coupling direction due to the water pressure action of the primary cooling water (Ca1) and comes off from the joint 15. In addition, when the secondary cooling pipe 12 and the joint 15 are screw-coupled with a left-hand thread, the drift surface (DF) of the secondary cooling pipe holding spacer 13 is generated so that a counterclockwise vortex is generated, which is the reverse of the above. ) Can be similarly avoided.

  9 and 10 show a fitting joint structure. FIG. 9 is an exploded perspective view, and FIG. 10 is a side sectional view showing a combined state.

  In this fitting-type joint coupling structure, a tubular joint 16 is joined to the water supply side of the secondary cooling pipe 12 using a tubular fastening ring CP. The secondary cooling pipe 12 is a fitting insertion portion 12d in which the water supply-side tip portion is fitted into the joint 16, and a protrusion-like anti-rotation hook 12f is provided on the outer peripheral surface of the fitting insertion portion 12d along the pipe axis direction. In addition, a flange-like fastening ring stopper 12r is provided on the terminal outer peripheral surface of the fitting insertion portion 12d. The cylindrical joint 16 is provided with a guide groove 16g that engages with the anti-rotation hook 12f on the inner peripheral surface of the portion where the insertion portion 12d of the secondary cooling pipe 12 is inserted, and the outer periphery on the cooling pipe coupling side. A threaded portion 16s1 for coupling the fastening ring is provided on the surface. The fastening ring CP is provided with a threaded portion 16s2 for coupling coupling that is threadedly engaged with the threaded portion 16s1 on the inner peripheral surface on the water supply side, and has a step that engages with the stopper 12r on the inner peripheral surface on the drain side. An abutting portion 16r is provided.

  In the assembly of the joint structure, the anti-rotation hook 12f provided at the fitting insertion portion 12d of the secondary cooling pipe 12 is engaged with the guide groove 16g provided on the inner peripheral surface of the joint 16 so that the secondary cooling pipe 12 can be assembled. The fitting insertion portion 12 d is fitted into the joint 16. By screwing the fastening ring CP fitted to the outer periphery of the water supply side of the secondary cooling pipe 12 in the tightening direction with respect to the threaded portion 16s1 of the joint 16, the threaded portion 16s1 of the joint 16 is threaded with the fastening ring CP. When the fastening ring CP is tightened, the portion 16s2 is screwed, and the abutting portion 16r of the fastening ring CP comes into contact with the stopper 12r of the secondary cooling pipe 12, and the secondary cooling pipe 12 is joined to the joint 16. The secondary cooling pipe 12 is joined to one water supply side pipe (water supply pipe) through the joint 16 together with the primary cooling pipe 11.

  11 and 12 show an example of the piping configuration on the water supply side and the drain side of the cooling pipe structure 10 constituted by the primary cooling pipe 11 and the secondary cooling pipe 12. Here, FIG. 11 shows an example of a pipe configuration in which the water supply side and the drainage side are aligned on one side on both sides where the through holes of the radiating fin 20 are provided, and an example of a pipe configuration in which the water supply side and the drainage side are alternately piped. This is shown in FIG.

  In the figure, reference numerals 5, 5A and 5B are water supply side pipes (water supply pipes), and reference numerals 6, 6A and 6B are drain side pipes (drainage pipes), respectively. Reference numeral PJ1 is a joint on the water supply side of the cooling pipe structure 10, and reference numeral PJ2 is a joint on the drain side of the cooling pipe structure 10. The joint PJ1 joins the primary cooling pipe 11 and the secondary cooling pipe 12 constituting the cooling pipe structure 10 to one water supply side pipe 5 (5A, 5B), respectively, and the primary cooling pipe 11 and the secondary cooling pipe 12 respectively. Supply cooling water (Ca) of the same pressure. The joint PJ1 is a joint structure (first configuration example) having the joint of the secondary cooling pipe 12 shown in FIG. 8 and a joint structure having the joint of the secondary cooling pipe 12 shown in FIGS. (Second configuration example), or a joint structure (third configuration example) shown in FIGS. 13 and 14 to be described later, or a joint structure (fourth configuration example) shown in FIGS. 15 to 17. Good. Here, as an example, the cooling pipe structure 10 is joined to the water supply side pipe 5 by a joint structure according to a fourth configuration example shown in FIGS. The joint structure according to the fourth configuration example realizes a flow rate control function by swirling the primary cooling water (Ca1) and a flow rate control function by accelerating (high pressure) the secondary cooling water (Ca2). .

  In the piping configuration example shown in FIG. 11, the piping configuration can be simplified by consolidating the water supply side and drainage side pipes on one side on both sides where the through holes of the heat dissipating fins 20 are provided. A temperature difference tends to occur between the water supply side and the drainage side of the fin 20. In the piping configuration example shown in FIG. 12, the temperature difference between the water supply side and the drainage side of the radiation fin 20 is made by alternately arranging the water supply side and the drainage side pipes on both side surfaces provided with the through holes of the radiation fin 20. However, the piping configuration on the water supply side and the drain side becomes complicated.

  FIG. 13 and FIG. 14 show a configuration example of FIG. 3 of the joint structure in which the primary cooling pipe 11 and the secondary cooling pipe 12 described above are joined to the water supply side pipe 5 (5A, 5B), respectively. Yes. FIG. 13 is an exploded perspective view of the joint portion, and FIG. 14 is a side view of the joint portion.

  A joint 17 that joins the primary cooling pipe 11 and the secondary cooling pipe 12 of the cooling pipe structure 10 to the water supply side pipe 5 (5A, 5B) is a cylindrical shape that joins the primary cooling pipe 11 of the cooling pipe structure 10. The outer pipe joint 17A, a cylindrical inner pipe joint 17B joined to the secondary cooling pipe 12 of the cooling pipe structure 10, and a ring-shaped inner pipe stopper 17C for locking the inner pipe joint 17B to the outer pipe joint 17A. It comprises.

  The outer pipe joint 17A has a threaded portion 17s1 for screwing the water supply side pipe 5 on the inner peripheral surface of the water supply side, and the primary cooling pipe 11 of the cooling pipe structure 10 on the inner peripheral surface of the drain side end. A threaded portion 17s6 for screwing the inner pipe joint 17B and a threaded portion 17s4 for screwing the inner tube stopper 17C on the inner peripheral surface of the intermediate portion. And is configured.

  The inner pipe joint 17B has a funnel-shaped taper portion (a throttle port diameter portion) 172 whose diameter decreases from the water supply side to the water discharge side at the intermediate portion between the water supply side end portion and the water discharge side end portion. At the end, there is a spacer 173 that holds the water supply port of the inner pipe joint 17B coaxially with the outer pipe joint 17A in the outer pipe joint 17A, and a threaded part 17s3 that is screwed into the threaded part 17s2. In addition, a connecting pipe part 171 having a threaded part 17 s 7 for screwing the secondary cooling pipe 12 to the drain side end is provided.

  The stopper 17C for the inner pipe is a so-called double nut that holds the coupling state (screwed state) between the outer pipe joint 17A and the inner pipe joint 17B so that the inner pipe joint 17B is not loosened in the outer pipe joint 17A. This is a fixing ring for providing an action, and has a threaded portion 17s5 that is screwed onto the threaded portion 17s4 on the outer peripheral surface. The inner pipe stopper 17C is not an essential component and can be omitted.

  For the joint 17 configured as described above, the water supply side pipe 5 is provided with a threaded portion 55 that is screwed into the threaded portion 17s1 on the outer peripheral surface of the end portion, and the primary cooling pipe 11 is threaded on the outer peripheral surface of the end portion. A threaded portion 11S that is screwed into the grooved portion 17s6 is provided, and the secondary cooling pipe 12 is provided with a threaded portion 12S that is threadedly engaged with the threaded portion 17s7 on the outer peripheral surface of the end.

  An example of the joining procedure between the water supply side pipe 5 and the cooling pipe structure 10 using the joint 17 will be described. The outer pipe joint 17A is joined to the water supply side pipe 5 by screw connection, and the outer pipe joint 17A is joined. The inner pipe joint 17B is screwed, the inner pipe joint 17B is fastened and fixed to the outer pipe joint 17A by the inner pipe stopper 17C, and the secondary cooling pipe 12 is joined to the inner pipe joint 17B by screw connection. The primary cooling pipe 11 is joined to 17A by screw connection. Accordingly, the primary cooling pipe 11 and the secondary cooling pipe 12 of the cooling pipe structure 10 are joined to the water supply side pipe 5 via the joint 17. In this joining operation, the secondary cooling pipe 12 moves in the tube axis direction in the primary cooling pipe 11, and the sliding frictional resistance accompanying this movement is, as described above, the spacer members 13a and 13b. , 13c hold the secondary cooling pipe 12 in the primary cooling pipe 11 by abutting against the inner wall of the primary cooling pipe 11 as a support point (TP) of the secondary cooling pipe 12 with respect to the primary cooling pipe 11 Therefore, the joining operation between the water supply side pipe 5 and the cooling pipe structure 10 with the joint 17 interposed therebetween can be performed smoothly.

  In this joint structure, among the cooling water (Ca) supplied from the water supply side pipe 5, the cooling water (Ca) flowing into the inner pipe joint 17B is increased in pressure by the tapered portion 172 formed in the inner pipe joint 17B. Then, the flow rate is increased and water is supplied to the secondary cooling pipe 12 as secondary cooling water (Ca2). By accelerating the secondary cooling water (Ca2), in the cooling pipe structure 10, the secondary cooling water (Ca2) that has absorbed heat from the primary cooling pipe 11 through which the primary cooling water (Ca1) flows is accelerated and drained more quickly. Therefore, it is possible to further suppress a decrease in the cooling capacity due to the temperature difference of the primary cooling water (Ca1).

  A joint structure in which the joint 17 having the above-described structure is further provided with a function of generating a vortex flow of the primary cooling water (Ca1) is shown in FIGS. 15 to 17 as a fourth structure example. FIG. 15 is a cross-sectional view of the joint portion, and FIGS. 16 and 17 show the flow of the primary cooling water (Ca1) and the secondary cooling water (Ca2) in the joint portion in perspective and side views, respectively. The joint structure according to the fourth configuration example realizes a flow rate control function by swirling the primary cooling water (Ca1) and a flow rate control function by accelerating (high pressure) the secondary cooling water (Ca2). .

  In the joint structure shown in FIGS. 15 to 17, the spacer 173 of the inner pipe joint 17B has three spacer members f1 to f3 each having a drift surface (DF) having a shape similar to that of a blade of a screw for generating a vortex. It is constituted by. The surface portions on the water supply side of the spacer members f1 to f3 constituting the inner pipe joint 17B and the spacer 173 are chamfered so as not to disturb the flow of the cooling water (Ca) supplied to the joint 17, respectively. The drift surface (DF) formed on the spacer members f1 to f3 generates a vortex in the same direction as the drift surface (DF) of the spacer members 13a to 13c constituting the secondary cooling pipe holding spacer 13 of the cooling pipe structure 10 described above. To occur.

  Accordingly, as shown in FIGS. 16 and 17, among the cooling water (Ca) supplied to the water supply side of the joint 17, the primary cooling water (Ca1) supplied into the outer pipe joint 17 </ b> A is the inner pipe joint. 17B is guided to the drift surface (DF) of the spacer 173 provided on the outer periphery of 17B, and flows as a vortex (WP) in the outer pipe joint 17A along the outer periphery of the inner pipe joint 17B toward the drain side (inner pipe joint It advances toward the drainage side while spirally turning around the outer periphery of 17B). The primary cooling water (Ca1) that has become the vortex flow (WP) is supplied to the primary cooling pipe 11 of the cooling pipe structure 10 and promotes the generation of the vortex flow in the cooling pipe structure 10.

  18 and 19 show another configuration example of the cooling pipe structure that is a joint target of the cooling pipe joint structure according to the embodiment. In this cooling pipe structure 10E, the secondary cooling pipe holding spacer 13 of the embodiment shown in FIGS. 1 to 5 described above is used to hold the secondary cooling pipe 12 in the primary cooling pipe 11 and the primary cooling water (Ca1). 18 and 19, the function of holding the secondary cooling pipe 12 and the function of generating the primary cooling water (Ca1) are separated from each other. Realized by body components. Here, spacers 18 for holding the secondary cooling pipe 12 coaxially with the primary cooling pipe 11 in the primary cooling pipe 11 are provided on both sides (water supply side and drainage side) of the secondary cooling pipe 12, respectively. The secondary cooling pipe 12 is provided with a blade assembly 19 that generates a vortex in the primary cooling water (Ca1) flowing along the outer circumference of the secondary cooling pipe 12 along the pipe axis.

  The spacer 18 includes three spacer members (support pieces) 181, 182, and 183, and the three spacer members 181, 182, and 183 are arranged at equal intervals (120 ° intervals) on the outer peripheral surface of the secondary cooling pipe 12 in the circumferential direction. ). The three spacer members 181, 182, and 183 are each composed of a pedestal portion 18 a having a streamline shape in the tube axis direction and a locking end portion 18 b having a tip formed in a spherical shape, as shown in an enlarged view in FIG. 18. It is comprised by. The spacer members 181, 182 and 183 having the pedestal portion 18 a and the locking end portion 18 b suppress the resistance of the water flow to the primary cooling water (Ca 1) flowing from the water supply side to the drain side. The flow of the primary cooling pipe 11 is made smooth, and the secondary cooling pipe 12 can be held coaxially with respect to the primary cooling pipe 11 so as to be slidable in the primary cooling pipe 11.

  The blade assembly 19 for generating a vortex flow in the primary cooling water (Ca1) includes a pair of three blade members (blades) 191, 192, and 193, which are secondary to the outer periphery of the secondary cooling tube 12 in the tube axis direction. Diffusion surfaces which are provided so as to be wound around the cooling pipe 12 and form curved surfaces which cause vortices in the same rotational direction as the vortices generated by the spacer members 13a to 13c constituting the secondary cooling pipe holding spacer 13, respectively. (DF). The blade assembly 19 acts as a blade that creates a vortex (WP) similar to the spacer members 13a, 13b, and 13c of the secondary cooling pipe holding spacer 13 described above, but the secondary cooling pipe 12 has the three spacer members 181. , 182, and 183 in a state where the arcuate edges of the blades do not contact the inner wall of the primary cooling pipe 11 while being held in the primary cooling pipe 11.

  As described above, in the cooling pipe structure 10E in which the holding function of the secondary cooling pipe 12 and the eddy current generation function of the primary cooling water (Ca1) are realized by separate components, the cooling pipe structure 10 is also provided. In addition, a water-cooled heat dissipation mechanism with improved cooling efficiency and cooling capacity can be realized.

  20 and FIG. 21, FIG. 22 and FIG. 23 show specific configuration examples of the main part of the water-cooled heat dissipation mechanism according to this embodiment.

  20 and 21 are arranged in a matrix direction on the circuit board 30 using the cooling pipe structure 10 shown in FIGS. 1 to 5 or the cooling pipe structure 10E shown in FIGS. 18 and 19 (matrix arrangement). FIG. 20 is a plan view and FIG. 21 is a side view showing a water-cooling type heat dissipation mechanism for cooling a plurality of semiconductor elements (power ICs). Here, a water-cooled heat dissipation mechanism to which the cooling pipe structure 10 is applied will be described as an example. The radiating fins 20 are made of a rectangular parallelepiped metal material that is thicker than the diameter of the primary cooling pipe 11 and has a high thermal conductivity, and is pierced between one side face and the other side face opposite to the same face. A plurality of through holes 21 for inserting the primary cooling pipes, and the primary cooling pipes 11 are fitted to the radiating fins 20 with the outer peripheral surfaces of the primary cooling pipes 11 being in surface contact with the inner peripheral surfaces of the through holes 21. It is inserted. A semiconductor substrate (power IC mounting substrate) in which a plurality of semiconductor elements (power ICs) 31 serving as a heating element are arranged in a matrix (matrix shape) on a flat heat absorbing surface 23 formed on one surface of the radiation fin 20. 30 is mounted, and the radiating fins 31a of the respective semiconductor elements 31 are screwed and fixed to flat heat absorbing surfaces 23 that perform heat exchange. Reference numeral 30h in the drawing is an opening provided at a semiconductor element mounting position of the semiconductor substrate 30.

  In the water-cooling type heat radiation mechanism using the flat plate-shaped heat radiation fins 20, when a single-tube structure cooling pipe is applied instead of the cooling pipe structure 10, the water supply side and the drainage side of the cooling pipe passage in the heat radiation fin 20 Since a relatively large temperature difference state (temperature difference state where the temperature on the drainage side is higher than that on the water supply side) is maintained, a circuit design based on the temperature on the drainage side is required, and further, the radiating fin 20 is enlarged. Is required. On the other hand, in the water cooling type heat radiation mechanism to which the cooling pipe structure 10 according to the above embodiment is applied, the temperature difference between the water supply side and the drain side of the cooling pipe passage in the heat radiation fin 20 can be suppressed to a narrow temperature fluctuation range. In addition, it is possible to contribute to circuit design and miniaturization of the water-cooled heat dissipation mechanism.

  In the water-cooling type heat radiation mechanism shown in FIGS. 22 and 23, the water-cooling type heat radiation mechanism shown in FIGS. 20 and 21 applies the cooling pipe structure 10 or the cooling pipe structure 10E provided with the primary cooling pipe 11. On the other hand, here, an outer tube corresponding to the primary cooling tube 11 is realized by the through hole 21. That is, the outer tube is configured by the through hole 21 formed in the heat radiating fin 20.

  In this structure, it is not necessary to consider the difference in thermal expansion between the heat radiating fins 20 and the primary cooling pipe 11, so that the design can be facilitated and the number of parts can be reduced. In the piping configuration shown in FIG. 23, the pipe diameter of the cooling pipe structure 10 (in accordance with the amount of heat generation) (in accordance with the amount of generated heat) of the semiconductor element (power IC) 31 arranged in the radiating fin 20 The temperature of the entire radiating fin 20 is made uniform by making the hole diameters different.

  The inner pipe joint 17B shown in FIGS. 15 to 17 described above has a joint structure in which a drift surface (DF) is formed on the spacer 173, and the spacer 173 has a function for generating a vortex flow of the primary cooling water (Ca1). However, FIG. 24 shows a first configuration example of an inner pipe joint 17B in which a spacer and a blade (blade) for generating eddy currents are formed separately, and FIG. 25 shows a second configuration example. Here, FIG. 24 shows an assembly structure based on a screw connection between a spacer and a blade as a first configuration example, and FIG. 25 shows an assembly structure based on a fitting connection between the spacer and the blade as a second configuration example. The blade is configured separately from the inner pipe joint 17B having the spacer 173 as a blade attachment 175.

  An inner pipe joint 17B shown in FIG. 24 has a threaded portion 17s8 for attaching a blade and a stopper formed on the outer periphery of a connecting pipe portion 171, and the threaded portion 17s8 has three blades b1, b2, and b3. The blade attachment 175 is screwed, the attachment stopper 176 is screwed to the threaded portion 17s8, and the blade attachment 175 is fixed (screwed) to the connecting pipe portion 171 with the attachment stopper 176, whereby the inner pipe joint 17B is fixed. A blade attachment 175 is integrally attached to the connecting pipe portion 171.

  The inner pipe joint 17B shown in FIG. 25 is formed with a stopper mounting screw part 17s8 and a guide groove 17g along the pipe axis on the outer periphery of the connecting pipe part 171, and a blade attachment 175 engaged with the guide groove 17g. After the stop hook 17p is formed and the rotation stop hook 17p of the blade attachment 175 is engaged with the guide groove 17g formed in the connecting pipe portion 171, the blade attachment 175 is fitted into the connecting pipe portion 171, and then the attachment stopper 176 is attached. Is screwed into the threaded portion 17s8 and the blade attachment 175 is fixed to the connecting pipe portion 171 with the attachment stopper 176, whereby the blade attachment 175 is integrally attached to the connecting pipe portion 171 of the inner pipe joint 17B.

  Also in the joint structure shown in FIGS. 24 and 25, a joint structure having a function of generating a vortex flow of the primary cooling water (Ca1) can be realized.

  As described in detail above, according to the embodiment of the present invention, it is possible to provide a cooling pipe joint structure capable of realizing a water-cooling heat dissipation mechanism with improved cooling efficiency and cooling capacity. Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. For example, in the above-described embodiment, the inner pipe joint 17B

  DESCRIPTION OF SYMBOLS 10, 10E ... Cooling pipe structure, 11 ... Outer pipe (primary cooling pipe), 11a ... Primary cooling water flow path, 12 ... Inner pipe (secondary cooling pipe), 12a ... Secondary cooling water flow path, 12f ... Anti-rotation hook, 12d ... insertion part, 12r ... fastening ring stopper, 13 ... secondary cooling pipe holding spacer, 13a, 13b, 13c ... spacer member, 15, 16, 17 ... joint, 16g ... guide groove, 17A ... Outer pipe joint, 17B ... Inner pipe joint, 17C ... Inner pipe stopper, 171 ... Connecting pipe part, 172 ... Funnel-shaped taper part (diaphragm diameter part), 173 ... Spacer, 18 ... Spacer, 181, 182, 183 ... Spacer 19: blade assembly, 191, 192, 193 ... blade member (blade), 20 ... radiation fin, 21 ... through hole, 31 ... semiconductor element (power IC), 31h, ta, tb, tc ... heat transfer path Ca ... cooling water, Ca1 ... primary cooling water, Ca2 ... secondary cooling water, WP ... vortex, DF ... drift surface, TP ... support point of secondary cooling pipe, f1-f3 ... spacer member, 5, 5A, 5B ... Water supply side piping (water supply pipe), 6, 6A, 6B ... Drain side piping (drainage pipe).

Claims (5)

A cooling pipe joint structure that is used in a water-cooled heat radiation mechanism that exchanges heat with a heat radiation fin and is applied to a pipe having a cooling pipe structure,
An outer tube,
An inner pipe that is provided in the outer pipe with a certain gap from the inner wall of the outer pipe, and in which cooling water from the water supply side goes straight and flows to the drain side;
A tubular outer pipe joint that joins the water supply side pipe and the outer pipe, and supplies the cooling water to the outer periphery of the inner pipe ;
An inner pipe joint having a spacer that keeps a certain gap from the inner wall of the outer pipe joint and supplies the cooling water into the inner pipe, and generates a vortex in the cooling water flowing on the outer periphery of the inner pipe; ,
Comprising
The outer pipe joint supplies the cooling water supplied from the water supply side pipe to the outer periphery of the inner pipe as primary cooling water that takes heat away from the radiating fin, and the inner pipe joint is connected to the inner pipe. A cooling pipe joint structure , wherein the cooling water of the same pressure supplied from the water supply side pipe is supplied as secondary cooling water for cooling the primary cooling water that has taken away the heat . 2. The cooling pipe joint structure according to claim 1, wherein the inner pipe joint has a tapered portion having a diameter that decreases from the cooling water supply side toward the inner pipe . A plurality of blades are provided on the outer peripheral surface of the inner pipe other than the inner pipe joint to cause vortex flow in the same direction with respect to the vortexed primary cooling water flowing on the outer periphery of the inner pipe ,
The cooling according to claim 1 , wherein the flow rate of the secondary cooling water flowing in the inner pipe is made faster than the flow rate of the primary cooling water by causing a vortex in the primary cooling water flowing on the outer periphery of the inner pipe. Pipe joint structure. Said spacer and said blade, a cooling pipe joint structure according to claim 1 or 3 having a water partial flow surface that occurs the vortex to vortex the same direction that occur in the outer tube. The joint between the outer pipe joint and the outer pipe and the water supply side pipe, and the joint between the inner pipe joint and the inner pipe and the inner wall of the outer pipe joint are joint structures by screwing, respectively. Item 2. The cooling pipe joint structure according to Item 1.

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