JP2009092357A - Tabular heat pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tabular heat pipe capable of approximating a temperature detected by a temperature detecting part of a heating element attached to a heating element attaching part to a temperature near an actual temperature of the heating element. <P>SOLUTION: The tabular heat pipe 1 is provided with a substrate 2 formed by two metal plates joined together. The heating element attaching part 5 and a heat radiation part 6 are provided on the substrate 2. A heat pipe part 8 laid across the heating element attaching part 5 and the heat radiation part 6 is formed on the substrate 2. The heat pipe part 8 is provided with an evaporation part 10 existing on the heating element attaching part 5 in the heat pipe part 8, and a bypass part 13 communicating a condensing part 11 with a portion existing on the heat radiation part 6. A temperature detection position 14 for detecting the temperature by the temperature detecting part S1 of the heating element S attached to the heating element attaching part 5 is provided in a portion provided with the bypass part 13 in the heating element attaching part 5 of the substrate 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a flat plate heat pipe used for cooling heat generating electronic components such as IPM (Intelligent Power Module), IGBT (Insulated Gate Bipolar Transistor), and thyristor used for machine tools and control robots, for example.

  In this specification and the claims, the top and bottom of FIGS. 1 and 3 are the top and bottom.

  As this type of flat heat pipe, a substrate is formed by two metal plates joined together, and a heating element mounting portion and a heat radiating portion are provided on the substrate, and at least one of the metal plates is expanded. As a result, a hollow hydraulic fluid enclosing portion is formed across the heating element mounting portion and the heat radiating portion, and a heat pipe is formed by enclosing the operating fluid in the operating fluid enclosing portion, and the heating element mounting in the heat pipe portion A plate-like heat pipe is known in which the part existing in the part becomes the evaporation part, the part existing in the heat radiating part becomes the condensation part, and the upper end part of the condensation part extends above the evaporation part ( Patent Document 1).

  By the way, the IPM used for the control device of a machine tool has a temperature detection unit that detects the temperature of the substrate of the flat plate heat pipe, and the temperature of the substrate of the flat plate heat pipe detected by the temperature detection unit is adjusted. When the threshold is exceeded, the machine tool is stopped to prevent damage to the IPM.

When the flat heat pipe described in Patent Document 1 is used for cooling the IPM of a machine tool, the temperature detection unit of the IPM attached to the heating element mounting part is more than the evaporation part of the heat pipe part in the heating element mounting part of the substrate. The temperature of the temperature detection position provided in the upper part and having no heat pipe portion is detected. However, since the temperature at the temperature detection position where the heat pipe portion does not exist is higher than the actual temperature of the IPM, the temperature detected by the temperature detection portion easily exceeds the threshold value, and the frequency at which the machine tool is stopped. There is a problem that increases.
JP 2005-283093 A

  The object of the present invention is to solve the above-mentioned problems and to make the temperature detected by the temperature detection unit of the heating element attached to the heating element mounting part a temperature close to the actual heating element temperature Is to provide.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A substrate is formed by two metal plates joined to each other, and a heating element mounting portion and a heat radiating portion are provided on the substrate, and at least one of the metal plates is bulged so that the heating element mounting portion and A hollow hydraulic fluid enclosing part is formed across the heat radiating part, and the heat pipe is formed by enclosing the hydraulic fluid in the hydraulic fluid enclosing part, and the part existing in the heating element mounting part in the heat pipe evaporates A part that exists in the heat radiating part is a condensing part, and the upper end part of the condensing part is a flat plate heat pipe extending above the evaporating part,
The heat pipe portion includes a bypass portion that allows the evaporation portion and the condensation portion to pass through, and the bypass portion is a metal plate at least one of the substrates between the upper end portion of the evaporation portion of the heat pipe portion and the condensation portion. The temperature detection position where the temperature is detected by the temperature detection part of the heating element attached to the heating element attachment part is provided in the part where the bypass part is provided in the heating element attachment part of the substrate. A flat heat pipe.

  According to the flat plate heat pipe of 1) above, the heat pipe portion includes a bypass portion that allows the evaporation portion and the condensation portion to pass through, and the bypass portion is formed between the upper end portion of the evaporation portion of the heat pipe portion and the condensation portion. The temperature detection of the heating element attached to the heating element mounting portion is formed by expanding the metal plate of at least one of the substrates in the middle, and the bypass heating portion of the heating element mounting portion of the board is provided. Since the temperature detection position where the temperature is detected by the part is provided, the temperature at the temperature detection position of the substrate is lower than that of the flat plate heat pipe described in Patent Document 1, and the heat generation attached to the heating element attachment part The temperature detected by the body temperature detection unit can be set to a temperature close to the actual temperature of the heating element. Therefore, for example, when this flat plate heat pipe is used for cooling the IPM of a machine tool, the temperature detected by the temperature detection unit of the IPM attached to the heating element mounting part is difficult to exceed the threshold value, and the machine tool is stopped. Less frequently. Further, since the gaseous hydraulic fluid generated in the evaporation part of the heat pipe part flows through the bypass part to the condensation part, the heat dissipation performance of the flat plate heat pipe is improved.

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

  In the following description, the left and right in FIG. In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  FIG. 1 shows the overall configuration of a flat plate heat pipe, and FIG. 2 shows the configuration of the main part thereof. FIG. 3 shows a heat dissipation device using a flat plate heat pipe.

  1 and 2, the flat plate heat pipe (1) includes a vertical substrate (2) formed by two metal plates (3) and (4) brazed to each other. The board (2) is integrally formed with the heating element mounting part (5) and the right edge of the heating element mounting part (5), and the upper end portion extends above the heating element mounting part (5). A heat radiating part (6) is provided. In addition, by enlarging at least one of the substrates (2), in this case, only one metal plate (3), a hollow working fluid is enclosed across the heating element mounting portion (5) and the heat radiating portion (6). A part (7) is formed, and a heat pipe part (8) is formed by sealing a working liquid (not shown) in the working liquid sealing part (7). A portion of the heat pipe portion (8) existing in the heating element mounting portion (5) is the evaporation portion (10), and a portion existing in the heat dissipation portion (6) is the condensing portion (11).

  The two metal plates (3) and (4) constituting the substrate (2) are made of an aluminum bare material, and are crimped to at least one of the mating surfaces of the two metal plates (3) and (4). Print the inhibitor in the required pattern, and press the two metal plates (3) and (4) in this state to make a laminated plate with non-crimped parts, and introduce fluid pressure into the non-crimped parts of the laminated plates Is produced by a so-called roll bond method in which the hydraulic fluid enclosing portion (7) is formed at once. In addition, the non-crimping part of the laminating plate is a non-crimping part for the hydraulic fluid enclosing part having a shape corresponding to the hydraulic fluid enclosing part (7), and fluid pressure introduction from the non-crimping part for the hydraulic fluid enclosing part to the periphery of the laminating plate It consists of a non-crimping part. When fluid pressure is introduced from the non-crimped portion for introducing fluid pressure to form the hydraulic fluid enclosing portion (7), one end of the non-crimped portion for introducing fluid pressure is connected to the hydraulic fluid enclosing portion (7) and the other end is aligned. It becomes the hydraulic fluid injection | pouring part opened to the peripheral edge of the board. The hydraulic fluid injection part is sealed after the hydraulic fluid is injected. Also, the two metal plates (3) and (4) constituting the substrate (2) are made of an aluminum brazing sheet having a brazing material layer on one side, and are brazed to each other using this brazing material layer. A substrate (2) may be formed. In this case, the hydraulic fluid enclosing part (7) is formed in advance on any one of the metal plates by press working.

  The evaporation part (10) of the heat pipe part (8) is a square loop-shaped part (10a) and a lattice formed so as to be continuous with the loop-shaped part (10a) in a part surrounded by the loop-shaped part (10a). It consists of a shape part (10b). The condensation part (11) of the heat pipe part (8) has a lower end part at the same height as a lower end part of the loop part (10a) of the heating element attachment part (5) and an upper end part of the loop part ( A rectangular loop-shaped portion (11a) that is longer in the up-down direction than 10a), and a lattice shape that is connected to the loop-shaped portion (11a) in a portion surrounded by the loop-shaped portion (11a) It consists of part (11b). Further, the heat pipe part (8) is located between the right side part of the loop part (10a) of the evaporation part (10) and the lower part of the left side part of the loop part (11a) of the condensation part (11). A plurality of communication portions (12) that are provided at intervals in the vertical direction and that allow both loop-like portions (10a) and (11a) to pass through are provided. Further, the cross-sectional shape of the bulging portion of one metal plate (3) of the hydraulic fluid enclosing portion (7) constituting the heat pipe portion (8) is an isosceles trapezoid, and the bulging side top wall is a flat wall. (See FIG. 2).

  The right side portion of the heating element mounting portion (5) of the substrate (2) protrudes upward and is integrated with the heat radiating portion (6). This upward protrusion is indicated by (5a). The heat pipe section (8) spans the upper end of the heating element mounting section (5), the upper protrusion (5a) and the left edge of the heat radiating section (6), and the evaporation section (10) and the condensation section (11). A bypass part (13) is provided. The bypass portion (13) is a metal on the side where the hydraulic fluid enclosing portion (7) is formed at the upper end portion of the heating element mounting portion (5), the upper protruding portion (5a), and the left edge portion of the heat radiating portion (6). The plate (3) is formed between the upper end of the evaporation section (10) of the heat pipe section (8) and the condensation section (11) by bulging in the same direction as the hydraulic fluid sealing section (7). ing. Note that the cross-sectional shape of the bulging portion constituting the bypass portion (13) is the same as the shape of the bulging portion forming the hydraulic fluid sealing portion (7). The bypass part (13) passes through the central part in the left-right direction of the upper side part of the loop part (10a) of the evaporation part (10) and the lower end part of the left side part of the loop part (11a) of the condensation part (11). I am letting. The temperature of the substrate (2) is detected by the temperature detector of the heating element attached to the heating element mounting part (5) in the part where the bypass part (13) is provided in the heating element mounting part (5) of the board (2). A temperature detection position (14) to be detected is provided.

  As shown in FIG. 3, the heat dissipating device (15) using the flat plate heat pipe (1) has the heat dissipating fins (16) extending vertically on both surfaces of the heat dissipating part (6) of the substrate (2). It is fixed over. The heat dissipating fin (16) includes a flat base portion (17) made of metal, here aluminum, and a plurality of parallel fin portions (18 that extend integrally in one side of the base portion (17) and extend vertically. ). One radiating fin (16) is fixed to the flat plate heat pipe (1) in a state where the entire base portion (17) is in surface contact with the outer surface of the metal plate (4) where the hydraulic fluid enclosing portion (7) is not formed. The other radiating fin (16) is connected to the flat heat pipe (1) in a state where the base portion (17) is in contact with the flat bulging end wall of the bulging portion forming the hydraulic fluid sealing portion (7). It is fixed. The radiating fin (16) is fixed to the flat plate heat pipe (1) by brazing or screwing.

  The heat dissipating device (15) is placed on any surface of the heating element mounting portion (5) of the substrate (2) of the flat plate heat pipe (1), here the surface on which the hydraulic fluid enclosing portion (7) swells. For example, it is used for a CNC (computer numerical control) machine tool in a state where the IPM (S) of the control device is in thermal contact. The temperature detection part (S1) of the IPM (S) of the CNC machine tool is the temperature detection position of the part where the bypass part (13) is provided in the heating element mounting part (5) of the flat plate heat pipe (1) ( Measure the temperature of 14).

  The heat generated from the IPM (S) is transmitted to the liquid-phase working fluid in the evaporation section (10) of the heat pipe section (8) through the metal plate (3), and the working liquid is evaporated. The vaporized working fluid that has evaporated passes through the communication part (12) and the bypass part (13), enters the condensing part (11), and ascends in the condensing part (11). The heat of the gas-phase hydraulic fluid is transferred to the base part (17) of the radiating fin (16) through the metal plate in the condensing part (11), and then transferred from the base part (17) to the fin part (18). Heat is radiated from the part (18). As a result, the gas-phase hydraulic fluid is condensed, and the liquid-phase hydraulic fluid passes through the communication portion (12) and returns to the evaporation portion (10) of the heat pipe portion (8). By repeating such an operation, the heat generated from the IPM (S) is radiated.

  Here, since the temperature detection position (14) is provided at the portion where the bypass portion (13) is provided in the heating element mounting portion (5) of the substrate (2), the temperature detection position of the substrate (2) The temperature detected by the temperature detection part (S1) of the IPM (S) attached to the heating element attachment part (5) is lower than that of the flat plate heat pipe described in Patent Document 1. Can be brought close to the actual temperature of the IPM (S). Therefore, the temperature detected by the temperature detection part (S1) of the IPM (S) attached to the heating element attachment part (5) does not easily exceed the threshold value, and the frequency at which the machine tool is stopped is reduced. Further, the gaseous hydraulic fluid generated in the evaporation section (10) of the heat pipe section (8) flows to the condensation section (11) even after passing through the bypass section (13). Performance is improved.

It is a front view which shows the flat heat pipe by this invention. It is an AA line expanded sectional view of FIG. It is a disassembled perspective view which shows the thermal radiation apparatus using the flat heat pipe of FIG.

Explanation of symbols

(1): Flat heat pipe
(2): Board
(3) (4): Metal plate
(5): Heating element mounting part
(6): Heat radiation part
(7): Hydraulic fluid enclosure
(8): Heat pipe section
(10): Evaporation section
(11): Condensing part
(13): Bypass section
(14): Temperature detection position
(S): IPM (heating element)
(S1): Temperature detector

Claims (1)

A substrate is formed by two metal plates joined to each other, and a heating element mounting portion and a heat radiating portion are provided on the substrate, and at least one of the metal plates is bulged to thereby form the heating element mounting portion and the heat radiating portion. A hollow hydraulic fluid enclosing portion is formed over the surface, and the heat pipe is formed by enclosing the hydraulic fluid in the hydraulic fluid enclosing portion, and the portion existing in the heating element mounting portion in the heat pipe portion is the evaporation portion In addition, the portion present in the heat radiating part is a condensing part, and the upper end part of the condensing part is a flat plate heat pipe extending above the evaporating part,
The heat pipe portion includes a bypass portion that allows the evaporation portion and the condensation portion to pass through, and the bypass portion is a metal plate at least one of the substrates between the upper end portion of the evaporation portion of the heat pipe portion and the condensation portion. The temperature detection position where the temperature is detected by the temperature detection part of the heating element attached to the heating element attachment part is provided in the part where the bypass part is provided in the heating element attachment part of the substrate. A flat heat pipe.

Images