JP2019169614A - Cooling apparatus - Google Patents

Abstract

To provide a cooling apparatus capable of easily performing work for connecting an inlet pile and an outlet pipe to a casing.SOLUTION: A cooling apparatus 1 comprises: a top wall 2a becoming a heating body attachment wall 3; and a casing 2 having a bottom wall 2b. In the casing 2, a first cooling liquid passage 4 positioned at a top wall 2a side and a second cooling liquid passage 5 positioned at a bottom wall 2b side are formed in a lamination state to a vertical direction via a separation wall 6. In a rear end part of the casing 2, a cooling liquid outlet 7 communicating with the first cooling liquid passage 4 and a cooling liquid inlet 8 communicating with the second cooling liquid passage 5 are formed so as to be opened to an upper surface of the casing 2, and a communication part 9 communicating with both cooling liquid passages 7 and 8 is formed in a front end part of the separation wall 6. The first cooling liquid passage 4 is provided with a plurality of plate fins 19, and a heat discharge tool 11 discharging heat to cooling liquid that flows in the first cooling liquid passage 4 in response to heat generated from a heat generating body P.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cooling device for cooling a heating element made of an electronic component such as a semiconductor element.

  In this specification and claims, the top and bottom of FIGS. 3 and 4 are referred to as top and bottom.

  For example, as a cooling device for cooling a power device (semiconductor element) such as an IGBT (Insulated Gate Bipolar Transistor) used in a power conversion device mounted on an electric vehicle, a hybrid vehicle, a train, etc., A flat shape comprising a top wall, a bottom wall and a peripheral wall and having a certain length and width, and either one of the top wall and the bottom wall is a heating element mounting wall to which a heating element is mounted on the outer surface A casing is provided, and in the casing, a first coolant passage located on the heating element mounting wall side and a second coolant passage located on the opposite side thereof are lined up and down via the partition wall. The width direction of the casing that is formed in a stacked manner and that is connected to the first coolant passage and discharges the coolant from the first coolant passage in the longitudinal end wall of the peripheral wall of the casing A long cooling liquid outlet and a long cooling liquid inlet in the width direction of the casing for supplying the cooling liquid into the second cooling liquid passage are formed, and both cooling liquid passages are passed through a portion that becomes the other end wall in the longitudinal direction of the peripheral wall of the casing. A long communication portion is formed in the width direction of the casing to be cooled, and the first and second coolant passages receive heat generated from the heating element attached to the outer surface of the heating element mounting wall and flow in the both coolant passages. A heat dissipator that dissipates heat to the liquid is provided, and each heat dissipator is provided integrally on both sides of the partition wall, and the longitudinal direction is directed to the longitudinal direction of both coolant passages and the width direction is directed to the vertical direction. And having a plurality of strip plate-like fins arranged at intervals in the width direction of both cooling liquid passages, and between the adjacent plate fins is a divided passage, and the radiator in the second cooling liquid passage The By cutting off the cooling fin inlet side end of the cooling fin, an inlet header for cooling liquid distribution is formed, and by cutting off the cooling fin outlet side end of the plate fin of the radiator in the first cooling fluid passage A cooling device in which an outlet header for cooling liquid merging is formed has been proposed (see Patent Document 1, FIG. 7 and FIG. 8).

  However, in the cooling device described in Patent Document 1, the coolant inlet and the coolant outlet are each long in the width direction of the casing, so that the coolant is supplied into the second coolant passage through the coolant inlet. The casing is connected to the casing so that the inlet pipe of the coolant is connected to the casing so as to communicate with the coolant inlet, and the outlet pipe for discharging the coolant is discharged from the first coolant passage through the coolant outlet. There is a problem that the work of connecting to is troublesome. In addition, since the inlet header for diverting the coolant is formed by cutting off the end portion of the cooling fin inlet side of the plate fin of the radiator in the second coolant passage, the entire second coolant passage is divided. In order to make the flow of the coolant to the passage uniform, it is necessary to increase the dimension of the inlet header in the longitudinal direction of the casing, which increases the size of the entire apparatus. In addition, in order to make the coolant flow split to all the divided passages of the second coolant passage without increasing the length of the inlet header in the casing longitudinal direction, it is necessary to provide a separate flow equalization member. The number of parts increases and the cost increases.

JP 2012-60040 A

  The object of the present invention is to solve the above-mentioned problems, and to easily connect the inlet pipe for supplying the coolant and the outlet pipe for discharging the coolant to the casing, and for cooling that has flowed into the casing through the coolant inlet. It is an object of the present invention to provide a cooling device that can make the flow of the liquid to the all divided passages of the second coolant passage uniform.

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

1) It consists of a top wall, a bottom wall and a peripheral wall and has a certain length and width, and either the top wall or the bottom wall is a heating element mounting wall on which a heating element is mounted on the outer surface. A flat casing is provided, and a first coolant passage located on the heating element mounting wall side and a second coolant passage located on the opposite side of the casing are vertically moved through the partition wall. Are formed in a laminated shape so as to be aligned with each other, on one end side in the longitudinal direction of the casing, on the coolant outlet that leads to the first coolant passage and discharges the coolant from the first coolant passage, and on the second coolant passage A cooling liquid inlet that communicates with and supplies the cooling liquid into the second cooling liquid passage is formed, and a communication portion that allows both cooling liquid passages to be formed on the other end side in the longitudinal direction of the casing is formed, and in the first cooling liquid passage, From the heating element attached to the outer surface of the heating element mounting wall Radiating member for radiating the cooling liquid receiving heat Serra flowing through the first coolant passage and a cooling device is provided with,
Both the coolant inlet and the coolant outlet are formed so as to open to either the upper surface or the lower surface of the casing, the communication portion is formed in the partition wall, and the radiator is arranged in the longitudinal direction of the first coolant passage. The first coolant passage is provided in a portion excluding a portion of a certain length near both ends, and the radiator has the longitudinal direction directed to the longitudinal direction of the first coolant passage and the width direction directed to the vertical direction. A plurality of strip-like plate fins arranged at intervals in the width direction and having one side edge joined to the partition wall and the other side edge joined to the heating element mounting wall. And a cooling device in which a divided passage is formed between adjacent plate fins of the radiator.

  2) The communicating portion of the partition wall is formed of a through hole formed in the partition wall and having a longitudinal direction directed to the width direction of the casing and a width direction directed to the longitudinal direction of the casing. The cooling device according to 1), wherein an end opposite to the coolant outlet side is located within a range in the width direction of the communication portion.

  3) The cooling device according to 2) above, in which adjacent plate fins of the radiator are integrally connected to each other vertically via a connecting portion, and the entire radiator is corrugated.

  4) In the second coolant passage of the casing, there are a plurality of spacers that extend in the longitudinal direction of the casing and maintain a space between the top wall and the bottom wall that do not become the heating element mounting wall and the partition wall. It is provided at intervals in the width direction of the casing, the length of the spacer is shorter than the length of the plate fin of the radiator, and the spacer is located within the range of the radiator when viewed from the plane. Any one of the above 1) to 3) in which a plurality of divided passages of the radiator are located between adjacent spacers and between the spacers located at both ends in the width direction of the casing and both side walls in the width direction of the casing. The cooling device according to 1.

  5) The partition wall has a portion of the first cooling fluid passage that is downstream of the divided passage between adjacent plate fins in communication with the second cooling fluid passage, and through the cooling fluid inlet into the second cooling fluid passage. A communication hole is formed in which a part of the supplied coolant is directly allowed to flow into a portion of the first coolant passage downstream of the divided passage without passing through the communication portion and the first coolant passage. -4) The cooling device in any one of.

  6) The casing is composed of a top wall forming part that forms the top wall and a top wall forming part that forms the top part of the peripheral wall, a top wall forming part that forms the bottom wall, and a peripheral wall forming part that forms the bottom part of the peripheral wall The cooling device according to any one of 1) to 5) above, wherein the intermediate plate is joined to the peripheral wall forming portion of the upper and lower constituent members. .

  7) The top wall of the casing serves as a heating element mounting wall, and a first coolant passage is formed between the upper component and the intermediate plate, and a second coolant passage is formed between the lower component and the intermediate plate. A narrow portion having a certain length is provided in a portion near the one end of the upper constituent member of the casing, and an opening is formed on the upper surface of the casing in a portion existing in the narrow portion in the top wall forming portion of the upper constituent member. An upper exposed portion having an upper surface exposed upward is provided at a portion where the coolant outlet is formed and is arranged in the width direction of the casing with respect to the narrow portion of the intermediate plate, and the upper exposed portion of the intermediate plate The cooling device according to 6) above, wherein the coolant inlet opening on the upper surface of the casing is formed so as to be aligned in the width direction of the casing with respect to the coolant outlet.

  8) The top wall of the casing serves as a heating element mounting wall, and a first coolant passage is formed between the upper component and the intermediate plate, and a second coolant passage is formed between the lower component and the intermediate plate. A narrow portion having a certain length is provided at a portion near the one end of the lower constituent member of the casing, and an opening is formed in the bottom surface forming portion of the lower constituent member at the lower portion of the casing. A lower exposed portion having a lower surface exposed downward is provided at a portion of the intermediate plate that is aligned in the width direction of the casing with respect to the narrow portion of the intermediate plate. The cooling device according to 6) above, wherein a cooling liquid outlet opening on the lower surface of the casing is formed in the exposed portion, and is formed so as to be aligned in the width direction of the casing with respect to the cooling liquid inlet.

  9) The lower exposed portion of the intermediate plate of the casing is provided with a recessed portion that is recessed downward and whose bottom wall bottom surface is located in the same horizontal plane as the bottom surface of the bottom wall forming portion of the lower component member. 8. The cooling device according to 8) above, wherein a coolant outlet is formed on the wall.

  10) A casing is arranged in the lower component, the upper component forming the top wall, the lower component consisting of the bottom wall forming part forming the bottom wall and the peripheral wall forming part forming the peripheral wall, and the partition wall The cooling device according to any one of the above 1) to 5), comprising an intermediate plate to be formed, wherein the intermediate plate is joined to the peripheral wall forming portion of the lower component.

  11) The peripheral edge of the intermediate plate is supported by an inwardly protruding support provided on the inner surface of the peripheral wall forming portion of the lower component, and in this state, the intermediate plate and the support of the lower component are joined 10. The cooling device as described in 10) above.

  12) The top wall of the casing becomes a heating element mounting wall, and a first coolant passage is formed between the upper component and the intermediate plate, and a second coolant passage is formed between the lower component and the intermediate plate. A cooling liquid outlet and a cooling liquid inlet that are open on the bottom surface of the casing are formed in the bottom wall forming portion of the lower component member of the casing side by side in the width direction of the casing, and below the portion corresponding to the cooling liquid outlet in the intermediate plate The bottom wall of the recess is joined to the top surface of the bottom wall forming portion of the lower component so that the through hole communicates with the coolant outlet. The cooling device according to 10) or 11) above.

  According to the cooling devices 1) to 12), the coolant that has flowed into the second coolant passage through the coolant inlet is directed toward the communicating portion while being shunted to the entire width of the second coolant passage. Flows, passes through the communication part, enters all the divided passages of the first coolant passage, flows in the divided passages in the first coolant passage toward the coolant outlet side, and flows out through the coolant outlet. . The heat generated from the heating element mounted on the outer surface of the heating element mounting wall is directly radiated to the coolant flowing through the dividing passage through the heating element mounting wall, and through the heating element mounting wall and the plate fin of the radiator. Heat is radiated to the coolant flowing in the divided passage.

  Since both the coolant inlet and the coolant outlet are open to either the upper surface or the lower surface of the casing, the coolant inlet and the coolant outlet have a simple configuration such as a circular through hole. This makes it easy to connect the coolant supply inlet pipe to the casing so as to lead to the coolant inlet and to connect the coolant discharge outlet pipe to the casing so as to lead to the coolant outlet. become.

  In addition, since the second coolant passage serves as an inlet header for coolant splitting into all the divided passages of the first coolant passage, it is not necessary to increase the longitudinal dimension of the casing, It becomes possible to reduce the size. In addition, it is not necessary to provide a separate flow equalizing member, the number of parts can be reduced, and the cost is reduced.

  Furthermore, since one side edge of each plate fin of the heat dissipator is joined to the partition wall and the other side edge is joined to the heating element mounting wall, the coolant bypass between the adjacent divided passages Is prevented. In addition, the effect of radiating the heat generated from the heating element attached to the outer surface of the heating element mounting wall to the coolant flowing through the first coolant passage through the plate fin is excellent.

  According to the cooling device of the above 2), in the portion where the cooling liquid inlet and the cooling liquid outlet side opposite to the cooling liquid outlet side of the plate fin of the radiator are located within the range in the width direction of the communicating part, Since at least a portion of the fixed length of the divided passage opens to the second coolant passage side through the communication portion, the coolant that has passed through the communication portion from the second coolant passage is divided into the radiator. Not only flows from the end of the passage into the divided passage, but also flows into at least some of the divided passages at the portion of the radiator that is located within the range in the width direction of the communicating portion. Therefore, pressure loss can be reduced without increasing the dimension of the communicating portion in the longitudinal direction of the casing.

  According to the cooling device of 3) above, the fixed length portion of the substantially half of the divided passages is located on the second coolant passage side in the portion located within the range of the communication portion in the width direction of the radiator. Since it opens, pressure loss reduction can be aimed at, without enlarging the dimension of the casing longitudinal direction of a communicating part. Moreover, since it flows in only from the edge part of a heat sink in the remaining division path of all the division paths, the fall of the heat transfer performance of a heat sink can be suppressed.

  According to the cooling device of 4), the partition wall is prevented from being deformed by the action of the spacer. Moreover, the spacer is located within the range of the radiator when viewed from the plane, and a plurality of radiators are disposed between the spacers located between the adjacent spacers and at both ends in the width direction of the casing and the side walls in the width direction of the casing. Therefore, it is possible to suppress an increase in pressure loss and a decrease in the performance of equalizing the flow distribution into all the divided passages of the first coolant passage.

  According to the cooling device of 5), the following effects can be obtained. That is, when the cooling device according to the present invention is used in combination with at least one other cooling device in series, the first and second coolant passages of the cooling device according to the present invention have a heating element mounting wall. In order to cool the heating element mounted on the outer surface, an excessive amount of coolant may flow and pressure loss may increase, but even in this case, if configured as in 5) above, the coolant inlet Part of the coolant that has flowed into the second coolant passage flows from the first through the communication holes into the downstream portion of the first coolant passage between the adjacent plate fins. It is possible to reduce the amount of the coolant flowing through and to prevent an increase in pressure loss.

  According to the cooling device of 6), the casing can be assembled relatively easily.

  According to the cooling device of the above 7), both the coolant inlet and the coolant outlet can be opened on the upper surface of the casing relatively easily.

  According to the cooling device of 8), both the coolant inlet and the coolant outlet can be opened on the lower surface of the casing in a relatively simple manner.

  According to the cooling device of 9), the periphery of the portion where the coolant inlet is formed on the outer surface of the bottom wall of the casing and the outer surface of the bottom wall of the recessed portion where the coolant outlet is formed are located in the same plane. The operation of connecting the inlet pipe for supplying the coolant to the casing so as to communicate with the coolant inlet and the operation of connecting the outlet pipe for discharging the coolant to the casing so as to communicate with the outlet of the coolant are simplified.

  According to the cooling device of the above 10), the casing can be assembled relatively easily. In addition, the number of joints that may cause leakage of the coolant from the inside of the casing to the outside can be reduced, and manufacturing stability against coolant leakage can be improved.

  According to the cooling device of the above 11), the intermediate plate can be disposed at a predetermined position in the lower component member relatively easily.

  According to the cooling device of the above 12), both the coolant inlet and the coolant outlet can be opened on the lower surface of the casing in a relatively simple manner.

It is a perspective view which shows the cooling device of this invention. It is a disassembled perspective view which shows the cooling device of FIG. It is an AA line expanded sectional view of FIG. It is a BB line expanded sectional view of Drawing 1. It is a disassembled perspective view which shows a part of 1st modification of the casing used for the cooling device of this invention. It is a disassembled perspective view which shows a part of 2nd modification of the casing used for the cooling device of this invention. It is a disassembled perspective view which shows a part of 3rd modification of the casing used for the cooling device of this invention.

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

  In this specification, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  In the following description, the direction indicated by the arrow X in FIG. 1 (right side in FIG. 4) is referred to as the front, the opposite side is referred to as the rear, and the direction indicated by arrow Y in FIG. The opposite side is called right.

  Further, the same components and the same parts are denoted by the same reference symbols throughout the drawings.

  1 and 2 show the overall configuration of the cooling device, and FIGS. 3 and 4 show the configuration of the main part of the cooling device.

  1 to 4, the cooling device (1) includes a top wall (2a), a bottom wall (2b) and a peripheral wall (2c) and has a certain length and width, and the top wall (2a) and One of the bottom walls (2b), here the top wall (2a) is a heating element mounting wall (3) to which a heating element is mounted on the outer surface, and a rectangular flat casing (2) that is long in the front-rear direction It has.

  In the casing (2), a first coolant passage (4) located on the heating element mounting wall (3) side (upper side) and a second coolant passage (5) located on the opposite side (lower side) (5) ) Are arranged in a stacked manner so as to be arranged in the vertical direction via the partition wall (6). A cooling liquid outlet (7) that communicates with the first cooling liquid passage (4) and discharges the cooling liquid from the first cooling liquid passage (4) at the rear end (one end) of the casing (2), and a second A coolant inlet (8) that communicates with the coolant passage (5) and supplies the coolant to the second coolant passage (5) is formed. Both the coolant outlet (7) and the coolant inlet (8) are open to either the upper surface or the lower surface of the casing (2), here the upper surface. A communication portion (9) is formed in the front end portion (other end portion) of the partition wall (6) of the casing (2) to allow both coolant passages (4) and (5) to pass therethrough. The first coolant passage (4) in the casing (2) receives heat generated from the heating element (P) mounted on the outer surface of the heating element mounting wall (3) and passes through the first coolant passage (4). A radiator (11) for radiating heat to the flowing coolant is provided. The radiator (11) is provided in a portion excluding a constant length portion near both ends in the longitudinal direction of the first coolant passage (4).

  Heat generation from power devices such as IGBTs, IGBT modules in which the IGBT is integrated with the control circuit and housed in the same package, and intelligent power modules in which the protection circuit is further integrated into the IGBT module and housed in the same package The body (P) is adapted to be attached to the outer surface of the top wall (2a) which is the heating element attachment wall (3).

  The casing (2) is a box-shaped aluminum upper structure opened downward, comprising a top wall forming part (12a) forming the top wall (2a) and a peripheral wall forming part (12b) forming the upper part of the peripheral wall (2c). A box-like aluminum bottom structure opened upward comprising a member (12), a bottom wall forming portion (13a) forming the bottom wall (2b), and a peripheral wall forming portion (13b) forming the lower portion of the peripheral wall (2c) The member (13) is joined to the peripheral wall forming portions (12b) and (13b) with a brazing material in a state where the peripheral portion is sandwiched between the peripheral wall forming portions (12b) and (13b) of the constituent members (12) and (13). And a flat aluminum intermediate plate (14) forming the partition wall (6), and a first coolant passage (4) is formed between the upper component member (12) and the intermediate plate (14). In addition, a second coolant passage (5) is formed between the lower component (13) and the intermediate plate (14). Hereinafter, joining with a brazing material is referred to as brazing. The upper component member (12) and the lower component member (13) are formed by pressing an aluminum blank.

  A narrow portion (15) having a certain length in the front-rear direction is provided near the rear end of the upper component (12) of the casing (2) and on the left side in the width direction. Upper exposed portion (16) whose upper surface is exposed upward in a portion aligned on the right side in the width direction of casing (2) with respect to narrow portion (15) in intermediate plate (14) of casing (2) Is provided. Then, a coolant outlet (7) opened on the upper surface of the casing (2) is formed in a portion existing in the narrow portion (15) in the top wall forming portion (12a) of the upper component member (12) of the casing (2). In the upper exposed portion (16) of the intermediate plate (14), the coolant inlet (8) opened on the upper surface of the casing (2) is aligned with the coolant outlet (7) in the width direction of the casing (2). It is formed as follows. Each of the coolant outlet (7) and the coolant inlet (8) is a circular through hole.

  A lower narrow portion (17) whose width gradually decreases toward the rear end is provided in a portion near the rear end of the lower component (13) of the casing (2). The portion that becomes the left edge of the lower narrow portion (17) of the peripheral wall forming portion (13b) is inclined rightward toward the rear, and the portion that becomes the right edge is also straight in the front-rear direction.

  The front end portion of the intermediate plate (14) of the casing (2) is formed of a rectangular through hole with the longitudinal direction facing the left-right direction and the width direction facing the front-rear direction, and the first coolant passage (4) and the first 2 A communication portion (9) is formed through which the coolant passage (5) is communicated.

  Further, the bottom wall forming portion (13a) of the lower component member (13) of the casing (2) extends in the longitudinal direction of the casing (2), and the distance between the bottom wall (2b) and the partition wall (4) A plurality of spacers (18) that maintain the above are integrally provided at intervals in the width direction of the casing (2) by deforming the bottom wall forming portion (13a). That is, the casing (2) extends in the longitudinal direction of the casing (2) between the top wall (2a) and the bottom wall (2b) of the casing (2) that does not become the heating element mounting wall (3) and the partition wall (6). In addition, a plurality of spacers (18) that maintain a gap between the wall that does not become the heating element mounting wall (3) and the partition wall (6) are integrally provided with a gap in the width direction of the casing (2). The length of the spacer (18) is shorter than the length in the front-rear direction of the radiator (11), and the spacer (18) is located within the range of the radiator (11) when viewed from the plane.

  The radiator (11) is formed in an overall corrugated shape using an aluminum plate, with the longitudinal direction directed in the front-rear direction (longitudinal direction of the first coolant passage (4)) and the width direction directed in the vertical direction. In the state, a plurality of strip plate fins (19) arranged at intervals in the width direction (left and right direction) of the first coolant passage (4) and all the plate fins (19) are integrated alternately one above the other. It consists of the connection part (21) to connect. The lower edge portion and the lower connection portion (21) of each plate fin (19) are brazed to the intermediate plate (14), and the upper edge portion and the upper connection portion (21) of the upper component member (12). A plurality of divided passages (22) of the first coolant passage (5) are formed between the adjacent plate fins (19) of the radiator (11) by brazing to the top wall forming portion (12a). Yes. And between the spacers (18) located between the adjacent spacers (18) and at both ends in the width direction of the casing (2) and the left and right side wall portions of the peripheral wall (2c) of the casing (2), the radiator (11) The plurality of plate fins (19) and the plurality of divided passages (22) are located. The radiator (11) has a rectangular shape that is long in the front-rear direction when viewed from above, and the front end is located in the middle of the width direction (front-rear direction) of the communicating part (9), and the rear end is a narrow part on both sides. (16) Located forward of (17). Since the front end of the radiator (11) is located in the middle in the width direction of the communication part (9), almost a half of all the divided passages (22) have a fixed length near the front end that connects the communication part (9). And opens to the second coolant passage (5).

  In the cooling device (1), an inlet pipe (not shown) having a circular cross section is connected to the coolant inlet (8) of the casing (2), and an outlet pipe having a circular cross section is connected to the coolant outlet (7). (Not shown) are connected. Then, the coolant flowing into the second coolant passage (5) of the casing (2) from the inlet pipe through the coolant inlet (8) flows in the second coolant passage (5) while being shunted forward. It leads to a communication part (9). Almost half of the coolant that has flowed forward in the second coolant passage (5) and reached the communication portion (9) passes through the communication portion (9) before reaching the front end of the radiator (11). And flows into the divided passage (22) opened to the second coolant passage (5). Further, the remaining portion of the coolant that has flowed forward in the second coolant passage (5) and reached the communication portion (9) is transferred from the front end opening of the remaining split passage (22) into the split passage (22). Inflow. The coolant that has flowed into all the divided flow paths flows backward in all the divided passages (22), and merges at a portion behind the radiator (11) in the first coolant passage (4). Outflow from outlet (7) through outlet pipe.

  The heat generated from the heating element (P) attached to the outer surface of the top wall (2a) of the casing (2) is transferred to the top wall (2a) and then passes through the split passage (22) of the coolant passage (3). Directly transmitted to the flowing coolant, and after passing from the top wall (2a) to the plate fin (19) of the radiator (11), the plate fin (19) passes through the inside of the dividing passage (22) of the coolant passage (3). Heat is released directly to the flowing coolant. Thus, the heating element (P) is cooled.

  5 to 7 show modifications of the casing of the cooling device according to the present invention.

  In FIG. 5, the casing (30) has a rectangular flat shape that is long in the front-rear direction, and includes a top wall (30a), a bottom wall (30b), and a peripheral wall (30c), and has a certain length and width, and The top wall (30a) is a heating element mounting wall (3) to which the heating element (P) is mounted on the outer surface. The intermediate plate (14), which serves as the partition wall (6) of the casing (30), is provided with a portion downstream of the divided passage (22) between the adjacent plate fins (19) in the first coolant passage (4). 2 A part of the coolant that is passed through the coolant passage (5) and supplied to the second coolant passage (5) through the coolant inlet (8) is connected to the communication portion (9) and the first cooling. A through-hole communication hole (31) that directly flows into a portion of the first cooling fluid passage (4) downstream of the division passage (22) without passing through the liquid passage (4) is formed.

  Therefore, a part of the coolant flowing in from the coolant inlet (8) passes through the communication hole (31) from the divided passage (22) between the adjacent plate fins (19) in the first coolant passage (4). Since it also flows into the downstream portion, the amount of the coolant flowing through both coolant passages (4) and (5) can be reduced, and an increase in pressure loss can be suppressed.

  In FIG. 6, the casing (40) has a rectangular flat shape that is long in the front-rear direction, and includes a top wall (40a), a bottom wall (40b), and a peripheral wall (40c), and has a certain length and width, and The top wall (40a) is a heating element mounting wall (3) to which the heating element (P) is attached to the outer surface, and both the cooling liquid inlet (8) and the cooling liquid outlet (7) of the casing (40) One of the upper surface and the lower surface of the casing (40), here, the lower surface is opened.

  The upper component (12) of the casing (40) is the upper component of the above-described embodiment except that the top wall forming portion (12a) is not formed with a circular through hole serving as a coolant outlet (7). The configuration is the same as that of the member (12).

  A narrow portion (41) having a certain length in the front-rear direction is provided near the rear end of the lower component (13) of the casing (40) and on the right side in the width direction. A lower exposed portion (42) whose lower surface is exposed downwardly in a portion aligned on the left side in the width direction of the casing (40) with respect to the narrow portion (41) in the intermediate plate (14) of the casing (40). ) Is provided. The lower exposed portion (42) of the lower component (13) in the intermediate plate (14) of the casing (40) is recessed downward and the bottom wall (43a) is the bottom wall forming portion of the lower component (13). A recess (43) is provided that is located in the same horizontal plane as the lower surface of (13a).

  The bottom wall (43a) of the recessed portion (43) of the intermediate plate (14) of the casing (40) is formed with a coolant outlet (7) that opens to the lower surface of the casing (40), and the lower configuration of the casing (40) The coolant inlet (8) opened to the lower surface of the casing (40) at the portion existing in the narrow portion (41) in the bottom wall forming portion (13a) of the member (13) has a casing with respect to the coolant outlet (7). It is formed to line up in the width direction of (2). Each of the coolant outlet (7) and the coolant inlet (8) is a circular through hole.

  Other configurations of the casing (40) are the same as those of the casing (40) of the above-described embodiment.

  In FIG. 7, the casing (50) has a rectangular flat shape that is long in the front-rear direction, and includes a top wall (50a), a bottom wall (50b), and a peripheral wall (50c), and has a certain length and width, and The top wall (50a) is a heating element mounting wall (3) to which the heating element (P) is attached to the outer surface, and both the coolant inlet (8) and the coolant outlet (7) of the casing (50) The casing (50) is open to either the upper surface or the lower surface, here the lower surface.

  The casing (50) forms a flat aluminum upper component (51) that forms the top wall (50a), a bottom wall forming portion (13a) that forms the bottom wall (50b), and a peripheral wall (50c). A box-shaped aluminum lower component member (13) that is opened upward and includes a peripheral wall forming portion (13b), and brazed to the lower component member (13) in a state of being disposed in the lower component member (13), and It comprises a flat aluminum intermediate plate (14) that forms the partition wall (6), and a first coolant passage (4) is formed between the upper component member (51) and the intermediate plate (14). A second coolant passage (5) is formed between the lower component (13) and the intermediate plate (14).

  The bottom wall forming portion (13a) of the lower component member (13) of the casing (50) is formed with a notch portion (52) extending forward from the central portion in the left-right direction of the rear edge portion. The peripheral wall forming portion (13b) of the lower component member (13) is provided integrally with the entire peripheral edge portion of the bottom wall forming portion (13a) including the notch portion (52). Further, an inwardly projecting support portion (53) is integrally provided on the entire inner surface of the peripheral wall forming portion (13b) of the lower component member (13).

  A coolant inlet formed of a circular through hole and opened to the lower surface of the casing (50) on the right side of the notch (52) in the bottom wall forming portion (13a) of the lower component (13) of the casing (50) (8) is formed. In addition, the cooling formed by a circular through hole and opened on the lower surface of the casing (50) on the left side of the notch (52) in the bottom wall forming portion (13a) of the lower component (13) of the casing (50) A liquid outlet (7) is formed. Therefore, the coolant outlet (7) is formed so as to be aligned in the width direction of the casing (50) with respect to the coolant inlet (8).

  In the intermediate plate (14) of the casing (50), it extends forward from the center in the left-right direction of the rear edge, and around the notch (52) in the peripheral wall forming portion (13b) of the lower component (13) A notch (54) is formed in which a portion existing in is fitted. The intermediate plate (14) is disposed in the lower component member (13) so that the peripheral edge portion is supported by the support portion (53) of the peripheral wall forming portion (50b) of the lower component member (13). The plate (14) and the inward protruding portion (53) of the lower component member (13) are brazed.

  In the intermediate plate (14) of the casing (50), a portion corresponding to the coolant outlet (7) on the left side of the notch (54) is recessed downward and a circular through hole (56) is formed in the bottom wall (55a). The formed recess (55) is provided, and the bottom wall (55a) lower surface of the recess (55) is the lower component (13) so that the through hole (56) communicates with the coolant outlet (7). Are brazed to the upper surface of the bottom wall forming portion (13a).

  Other configurations of the casing (50) are the same as those of the casing (50) of the above-described embodiment.

  In the casing (2) of the embodiment described above and the casings (30), (40), and (50) of the modified examples, the top walls (2a), (30a), and (40a) of the casings (2), (30), (40), and (50) ) (50a) is a heating element mounting wall (3) to which the heating element (P) is attached to the outer surface, but is not limited to this, and the top wall (2a) (30a) (40a) ( In place of 50a), the bottom walls (2b), (30b), (40b), and (50b) may be heating element mounting walls (3) to which the heating elements (P) are attached to the outer surface. In this case, the configuration of the casing is a configuration that is upside down with respect to the above-described casings (2), (30), (40), and (50).

  The cooling device according to the present invention is suitably used for cooling a power device such as an IGBT used in a power conversion device mounted on an electric vehicle, a hybrid vehicle, a train or the like.

(1): Cooling device
(2) (30) (40) (50): Casing
(2a) (30a) (40a) (50a): Top wall
(2b) (30b) (40b) (50b): Bottom wall
(3): Heater mounting wall
(4): First coolant passage
(5): Second coolant passage
(6): Partition wall
(7): Coolant outlet
(8): Coolant inlet
(9): Communication part
(11): Radiator
(12): Upper component
(12a): Top wall forming part
(12b): Perimeter wall forming part
(13): Lower component
(13a): Bottom wall forming part
(13b): Perimeter wall forming part
(14): Intermediate plate
(15): Narrow part
(16): Upper exposed area
(18): Spacer
(19): Plate fin
(21): Connection part
(22): Dividing passage
(31): Communication hole
(41): Narrow part
(42): Lower exposed area
(43): Recess
(43a): Bottom wall
(51): Upper component
(53): Support part
(55): Recess
(55a): Bottom wall
(56): Through hole

Claims (12)

A flat shape comprising a top wall, a bottom wall and a peripheral wall and having a certain length and width, and either one of the top wall and the bottom wall is a heating element mounting wall to which a heating element is mounted on the outer surface A casing is provided, and in the casing, a first coolant passage located on the heating element mounting wall side and a second coolant passage located on the opposite side thereof are lined up and down via the partition wall. Formed in a laminated shape, and at one end in the longitudinal direction of the casing, communicates with the first coolant passage and discharges the coolant from the first coolant passage, and communicates with the second coolant passage. A cooling liquid inlet for supplying the cooling liquid is formed in the second cooling liquid passage, and a communicating portion is formed on the other end side in the longitudinal direction of the casing to allow the both cooling liquid passages to pass through. A heating element is formed in the first cooling liquid passage. A heating element attached to the outer surface of the mounting wall The first coolant heat sink ring for radiating the cooling liquid flowing through the passage a cooling device is provided by the heat that is,
Both the coolant inlet and the coolant outlet are formed so as to open to either the upper surface or the lower surface of the casing, the communication portion is formed in the partition wall, and the radiator is arranged in the longitudinal direction of the first coolant passage. The first coolant passage is provided in a portion excluding a portion of a certain length near both ends, and the radiator has the longitudinal direction directed to the longitudinal direction of the first coolant passage and the width direction directed to the vertical direction. A plurality of strip-like plate fins arranged at intervals in the width direction and having one side edge joined to the partition wall and the other side edge joined to the heating element mounting wall. And a cooling device in which a divided passage is formed between adjacent plate fins of the radiator.   The communication portion of the partition wall is formed of a through hole formed in the partition wall and having a longitudinal direction directed to the width direction of the casing and a width direction directed to the longitudinal direction of the casing. The cooling device according to claim 1, wherein an end opposite to the outlet side is located within a range in a width direction of the communication portion.   The cooling device according to claim 2, wherein adjacent plate fins of the heat dissipator are integrally connected to each other alternately through a connecting portion, and the entire heat dissipator has a corrugated shape.   A plurality of spacers extending in the longitudinal direction of the casing in the second coolant passage of the casing and maintaining a distance between the top wall and the bottom wall that do not serve as the heating element mounting wall and the partition wall are provided on the casing. It is provided at intervals in the width direction, and the length of the spacer is shorter than the length of the plate fin of the radiator, and the spacer is located within the range of the radiator when viewed from the plane and adjacent to each other. The some division | segmentation channel | path of a radiator is located between the spacer located between the spacers and the width direction both ends of a casing, and the both side walls of the width direction of a casing. Cooling system.   A portion of the first coolant passage downstream of the divided passage between adjacent plate fins is communicated with the partition wall through the second coolant passage, and is supplied to the second coolant passage through the coolant inlet. 5. A communication hole is formed for allowing a part of the coolant to directly flow into a portion of the first coolant passage downstream of the divided passage without passing through the communication portion and the first coolant passage. The cooling device in any one of.   The casing includes a top wall forming portion that forms a top wall and an upper component member that includes a peripheral wall forming portion that forms an upper portion of the peripheral wall, and a bottom wall forming portion that forms a bottom wall and a peripheral wall forming portion that forms a lower portion of the peripheral wall. The cooling device according to any one of claims 1 to 5, comprising a lower constituent member and an intermediate plate forming a partition wall, wherein the intermediate plate is joined to the peripheral wall forming portions of the upper and lower constituent members.   The top wall of the casing becomes a heating element mounting wall, a first coolant passage is formed between the upper component and the intermediate plate, and a second coolant passage is formed between the lower component and the intermediate plate, A cooling liquid that is provided on the upper surface of the casing in a portion that is provided in the narrow portion in the top wall forming portion of the upper component member, in which a narrow portion having a certain length is provided in a portion near the one end of the upper component member of the casing. An outlet is formed, and an upper exposed portion whose upper surface is exposed upward is provided in a portion of the intermediate plate aligned in the width direction of the casing with respect to the narrow portion, and the upper exposed portion of the intermediate plate is provided with an upper exposed portion. The cooling device according to claim 6, wherein the coolant inlet opening on the upper surface of the casing is formed so as to be aligned in the width direction of the casing with respect to the coolant outlet.   The top wall of the casing becomes a heating element mounting wall, a first coolant passage is formed between the upper component and the intermediate plate, and a second coolant passage is formed between the lower component and the intermediate plate, A narrow portion having a certain length is provided in a portion near the one end of the lower constituent member of the casing, and a cooling that opens to the lower surface of the casing in a portion existing in the narrow portion in the bottom wall forming portion of the lower constituent member. A liquid inlet is formed, and a lower exposed portion having a lower surface exposed downward is provided in a portion of the intermediate plate that is aligned in the width direction of the casing with respect to the narrow portion, and the lower exposed portion of the intermediate plate The cooling device according to claim 6, wherein a cooling liquid outlet opening in a lower surface of the casing is formed in the portion, and the cooling liquid inlet is formed so as to be aligned in the width direction of the casing with respect to the cooling liquid inlet.   The lower exposed portion of the intermediate plate of the casing is provided with a recessed portion that is recessed downward and whose bottom wall bottom surface is located in the same horizontal plane as the bottom surface of the bottom wall forming portion of the lower component member. The cooling device according to claim 8, wherein a cooling liquid outlet is formed.   The casing is disposed in the lower component member to form a partition wall, the upper component member forming the top wall, the lower component member including the bottom wall forming part forming the bottom wall and the peripheral wall forming part forming the peripheral wall. The cooling device according to any one of claims 1 to 5, further comprising an intermediate plate, wherein the intermediate plate is joined to the peripheral wall forming portion of the lower component member.   The peripheral portion of the intermediate plate is supported by an inwardly protruding support portion provided on the inner surface of the peripheral wall forming portion of the lower component member, and the intermediate plate and the support portion of the lower component member are joined in this state. Item 11. The cooling device according to Item 10. The top wall of the casing becomes a heating element mounting wall, a first coolant passage is formed between the upper component and the intermediate plate, and a second coolant passage is formed between the lower component and the intermediate plate, A coolant outlet and a coolant inlet opening on the bottom surface of the casing are formed side by side in the width direction of the casing at the bottom wall forming portion of the lower component of the casing, and are recessed downward in a portion corresponding to the coolant outlet in the intermediate plate. And a recessed portion having a through hole formed in the bottom wall, and the bottom wall lower surface of the recessed portion is joined to the upper surface of the bottom wall forming portion of the lower component so that the through hole communicates with the coolant outlet. Item 12. The cooling device according to Item 10 or 11.

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