JP6444162B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger formed by stacking a plurality of relatively thin core plates made of an aluminum alloy or the like.

  As a heat exchanger such as an oil cooler, a structure in which a plurality of relatively thin core plates made of an aluminum alloy or the like are stacked and a fluid passage is formed between adjacent core plates is known. In this type of heat exchanger, as described in Patent Document 1, a top plate that is relatively thicker than the core plate is disposed on a core portion formed by stacking core plates. In addition, an L-shaped connector constituting an inlet and an outlet of a fluid, for example, cooling water, is attached.

  The connector is made of the same kind of metal as the core plate and the top plate, for example, a metal tube made of an aluminum alloy, and is bent into an L shape and brazed to the top plate. The connector is brazed by heating in a furnace in a state where the respective members are assembled, simultaneously with the brazing of the plurality of core plates and the top plate. As the supply of the brazing material, there is a method of using a clad material having a brazing material layer on the surface as a core plate or a connector, or a method of sandwiching a sheet-shaped brazing material between the joining surfaces.

  Note that Patent Document 1 discloses a heat exchanger having a configuration in which an oil passage and a cooling water passage are alternately configured by a plurality of core plates, but the oil is obtained by stacking a plurality of core plates. There is also known a type in which only a passage is formed and accommodated in a chamber through which cooling water flows.

JP 2014-95492 A

  In the connector composed of the metal tube as described above, a relatively large bending radius is required so that the metal tube is not crushed and deformed when bent into an L shape. For this reason, the amount of protrusion from the uppermost core plate (see symbol H in FIG. 12) increases, and there is a problem that the mounting space for this type of heat exchanger becomes unnecessarily large.

In the first invention, a plurality of shallow dish-shaped core plates constituting a fluid passage are stacked, and a top plate relatively thicker than the core plate is formed on the inner peripheral side of the side wall of the uppermost core plate. In a heat exchanger that is laminated and brazed together into parts by heating in a furnace,
The connector connecting portion provided on the top plate is formed in a cylindrical shape with a protruding length protruding above the side wall portion around the uppermost core plate,
A seal ring holding groove is formed on the outer peripheral surface of the base of the synthetic resin connector molded in an L shape in advance, and the seal ring holding groove is adjacent to the seal ring holding groove in the axial direction and is locally located on the inner peripheral side of the connector connecting portion. Forming recesses to accept general deformation at multiple locations in the circumferential direction ,
It is to locally pressed and deformed toward the inner circumferential side a plurality of positions respectively corresponding to the recess located above the aforementioned side wall portions of the connector connecting portion in which the connector is inserted, the connector to the connector connecting portion Both the axial direction and the circumferential direction are fixed and attached to the top plate.

  Thus, by making the L-shaped connector made of synthetic resin, a bending radius is not required, and the connector can be configured to be bent at a right angle, for example. Accordingly, the amount of protrusion of the connector from the uppermost core plate or top plate is reduced.

In this synthetic resin connector, after a plurality of core plates are integrally brazed together with the top plate, a mounting base is inserted into the cylindrical connector connecting portion of the top plate, and the connector connecting portion is inserted from the outer peripheral side through a jig. It is attached by locally deforming a plurality of locations in the circumferential direction. The connector is fixed in both the axial direction and the circumferential direction by the portion of the connector connecting portion deformed to the inner peripheral side entering the concave portion of the synthetic resin connector.

In addition , the second invention,
A seal ring holding groove is formed on the outer peripheral surface of the base of the synthetic resin connector molded in an L shape in advance, and the seal ring holding groove is adjacent to the seal ring holding groove in the axial direction and is locally located on the inner peripheral side of the connector connecting portion. Forming a fragile part that accepts general deformation,
The top plate is formed by locally pressing and deforming a plurality of circumferential locations corresponding to the weakened portion located above the side wall portion of the connector connecting portion into which the connector is inserted, toward the inner peripheral side. Attached to the
The fragile portion is formed so as to be partially low in strength by providing a large number of slits in a part of the mounting base outer peripheral surface in the axial direction, and is a locally deformed portion of the connector connecting portion. The connector is fixed to the connector connecting portion in both the axial direction and the circumferential direction by biting into the fragile portion.
In this case, if the connector connecting part is locally pressed at an arbitrary position in the circumferential direction, the deformed part of the connector connecting part deformed locally enters the weak part , and the connector is fixed in both the axial direction and the circumferential direction. Is done.

  The heat exchanger of the present invention is, for example, an oil cooler in which oil passages and cooling water passages are alternately formed between a plurality of core plates, and the connector is used as an outlet or an inlet of cooling water.

  According to this invention, by combining the synthetic resin connector with the heat exchanger in which a plurality of core plates are integrally brazed together with the top plate, the protruding length of the L-shaped connector is reduced, and the heat exchanger Space required for mounting can be reduced.

The perspective view of the oil cooler to which this invention is applied. Sectional drawing of the principal part of this oil cooler. Sectional drawing along the AA line of FIG. Sectional drawing which shows a synthetic resin connector alone. Sectional drawing along the BB line of FIG. Explanatory drawing which shows the state which set the connector connection part to the jig | tool with the connector. Explanatory drawing which shows the state which deformed the connector connection part with the jig | tool. Sectional drawing which shows the connector of 2nd Example alone. Sectional drawing along CC line of FIG. Explanatory drawing which shows the state which set the connector of 2nd Example to the jig | tool. Explanatory drawing which shows the state which deformed the connector connection part with the jig | tool. Sectional drawing of the comparative example using the connector which consists of metal pipes.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  1 and 2 show an oil cooler that cools lubricating oil of, for example, an automobile internal combustion engine by heat exchange with cooling water, as an embodiment of the heat exchanger according to the present invention. In the following, for ease of understanding, the terms “upper” and “lower” are used as necessary with reference to the postures of FIGS. 1 and 2 as necessary. However, when the oil cooler is actually used, FIGS. It is not limited to 2 mounting postures.

  The oil cooler is provided with a core portion 1 formed by laminating a large number of thin plate-like core plates 5 together with fin plates (not shown) on a relatively thick plate-like bottom plate 2 and second bottom plate 3. In addition, a top plate 4 thicker than the core plate 5 is overlaid on the core portion 1. A pair of synthetic resin connectors 7 serving as a cooling water inlet and a cooling water outlet are attached to the top plate 4. Each component of the oil cooler (that is, the core plate 5, the bottom plate 2, the second bottom plate 3, and the top plate 4) excluding the synthetic resin connector 7 is made of an aluminum-based material, and is in a predetermined state. After being assembled, each part is brazed together by heating in a furnace while being held by a jig. As a method for supplying the brazing material, the core plate 5 or the like is formed as a so-called clad material in which a brazing material (for example, an aluminum-based material having a melting point lower than that of the base material) is coated on the surface of the base material made of an aluminum-based material. Alternatively, another brazing material having a sheet shape or the like may be disposed on the joint surface.

  As shown in FIG. 2, the core portion 1 is formed by stacking a large number of shallow dish-shaped core plates 5 having the same basic rectangular shape together with fin plates (not shown), thereby adjacent two core plates 5. In the meantime, the oil passages 10 and the cooling water passages 11 are alternately configured, and the core plate 5 actually includes a plurality of types of core plates 5 with different details. They are combined. When roughly classified, the lower core plate 5 </ b> A located below the oil passage 10 and the upper core plate 5 </ b> B located above the oil passage 10 are provided. In these core plates 5, circular oil communication holes (not shown) are formed at two diagonal positions, and circular cooling water communication holes 12 are formed at two different diagonal positions. Further, a circular oil outlet hole (not shown) is formed at the center position. These oil communication holes, cooling water communication holes 12 and oil outlet holes are provided at positions aligned in the vertical direction with respect to the plurality of core plates 5 constituting the core portion 1. And as shown in FIG. 2, the circular boss | hub part 13 provided in the circumference | surroundings, such as the cooling water communicating hole 12 and the oil communicating hole which is not shown in figure, is joined mutually, and the oil passage 10 and cooling water passage of each step | level 11 are sealed, and a cooling water passage and an oil passage are arranged in the vertical direction. The lower core plate 5A and the upper core plate 5B differ in the arrangement of the boss portions 13 and the bulging direction.

  The connectors 7 serving as the cooling water inlet and the cooling water outlet are respectively positioned above the cooling water flow path aligned in the vertical direction, that is, above the cooling water communication hole 12. Therefore, as shown in FIG. 1, the pair of connectors 7 are arranged on a diagonal line of the core portion 1 having a rectangular shape.

  In addition, each core plate 5 has a side wall portion 14 rising in a tapered shape at the periphery, and the side wall portions 14 of the core plates 5 stacked in the vertical direction are brazed to each other, so that the oil in each step The periphery of the passage 10 and the cooling water passage 11 is sealed. Each of the side wall portions 14 extends obliquely upward. Therefore, the uppermost core plate 5 protrudes upward from the upper surface of the core plate 5 so as to surround four sides. The top plate 4 overlaid on the uppermost core plate 5 is located on the inner peripheral side of the four side walls 14 of the uppermost core plate 5, and the thickness of the top plate 4 is higher than the upper side of the side walls 14. It is smaller than the protruding amount. Accordingly, the top plate 4 has a shape dropped into the side wall portion 14, and the periphery thereof is surrounded by the side wall portion 14 of the core plate 5.

  An oil passage bulging portion 16 that bulges upward is formed at a central portion of the top plate 4 along a diagonal line that is different from the diagonal line connecting the pair of connectors 7. The oil passage bulging portion 16 forms an oil communication passage (not shown) along the diagonal line with the uppermost core plate 5, and the pair of the oil communication passages described above is formed by the oil communication passage. The oil communication hole communicates with the central oil outlet hole. The oil passage bulging portion 16 protrudes slightly above the upper edge 14 a of the side wall portion 14 of the uppermost core plate 5.

  A cylindrical connector connecting portion 17 for attaching the above-mentioned synthetic resin connector 7 is formed on the pair of corner portions of the top plate 4 so as to protrude upward. The connector connecting portion 17 has a simple cylindrical shape before the connector 7 to be described later is mounted. In particular, the connector connecting portion 17 protrudes upward from the upper edge 14a of the side wall portion 14 of the uppermost core plate 5. Have a length.

  The synthetic resin connector 7 attached to the connector connecting portion 17 is integrally molded with a hard synthetic resin such as a nylon resin blended with glass fiber, and as shown in FIGS. The vertical portion 7A and the horizontal portion 7B are L-shaped connected at a right angle, and the vertical portion 7A and the horizontal portion 7B each have a cylindrical shape with a perfect cross section. The passage portion 18 formed in the connector 7 is bent substantially at a right angle, and is formed in a tapered shape having an appropriate draft angle in each of the vertical portion 7A and the horizontal portion 7B. The lower end portion of the vertical portion 7A is configured as an attachment base portion 19 for connection to the connector connection portion 17, and the vertical portion 7A has a minimum length necessary for forming the attachment base portion 19. Accordingly, the connector 7 has an L-shape in which the length of the vertical portion 7A is shorter than the length of the horizontal portion 7B.

  The mounting base 19 has an annular flange 21 that serves as a boundary with the general portion of the vertical portion 7A, a tapered surface 22 at the tip, and a seal ring holding groove 23 adjacent to the tapered surface 22. It is recessed. As shown in FIG. 2, an O-ring 24 is attached to the seal ring holding groove 23 as a seal ring that seals between the attachment base portion 19 and the connector connection portion 17. A recess 25 serving as a receiving portion for receiving deformation of the connector connecting portion 17 is formed between the seal ring holding groove 23 and the flange 21 adjacent to the seal ring holding groove 23 in the axial direction. . As shown in FIG. 5, the recessed part 25 is formed as a groove | channel of the cross-sectional rectangle extended in the circumferential direction in four places of the circumferential direction. In addition, as shown in FIG. 5, it is preferable to arrange | position the recessed part 25 in four places which make an angle of 45 degrees with respect to the direction where the horizontal part 7B extends from the vertical part 7A.

  The cylindrical connector connecting portion 17 in the top plate 4 has an inner diameter substantially equal to the outer diameter of the mounting base portion 19 (more specifically, slightly larger) in the initial state, and is configured as described above. The mounting base 19 is inserted together with the O-ring 24 after the brazing of the core part 1. As shown in FIGS. 2 and 3, the connector connecting portion 17 having a cylindrical shape in the initial state is plastically deformed by being pressed toward the inner peripheral side at four locations corresponding to the concave portions 25 of the mounting base portion 19. Thus, the synthetic resin connector 7 is fixed to the top plate 4. That is, by pressing from the outer peripheral side, the connector connecting portion 17 made of an aluminum-based material is locally deformed to the inner peripheral side, and is in a state of biting into the concave portion 25 on the connector 7 side. Thereby, the connector 7 is firmly fixed in both the axial direction and the circumferential direction. In addition, the code | symbol 26 in a figure has shown the depression part which appeared on the outer peripheral surface of the connector connection part 17 by the press deformation | transformation of the connector connection part 17. FIG.

  6 and 7 are explanatory views showing the steps for deforming the connector connecting portion 17 as described above, and the jig 31 has the connector connecting portion 17 on the inner side by the recesses 32a of the pair of half molds 32. And a total of four push rods 33 that move forward and backward toward a position corresponding to the recess 25 of the mounting base 19. Specifically, each of the half molds 32 slidably holds a pair of push rods 33 arranged in parallel to each other. Further, the tip of each push rod 33 has a shape that is inclined obliquely in consideration of the approach direction with respect to the recess 25. FIG. 6 shows a state in which the connector connecting portion 17 is set on the jig 31 together with the mounting base portion 19, and the horizontal portion 7 </ b> B of the connector 7 is arranged along the split surface of the pair of half-shaped molds 32. In this state, by pressing each pair of push rods 33 inward using a hydraulic plunger or the like (not shown), as shown in FIG. 7, the connector connecting portion 17 on the recess 25 is locally connected to the inner periphery. It is deformed to the side and is in a state of being bitten into the recess 25.

  In the deformation process using the jig 31, the jig 31 is placed on the upper edge 14 a of the side wall portion 14 of the uppermost core plate 5, and the oil passage bulging portion 16 of the top plate 4 and In order to avoid this interference, the push rod 33 is arranged so as to be parallel to the longitudinal direction of the oil passage bulging portion 16. As described above, since the connector connecting portion 17 protrudes upward from the upper edge 14a of the side wall portion 14 of the uppermost core plate 5, the deformation processing for the recess 25 is performed using the portion above the upper edge 14a. Is possible. That is, the recessed portion 26 of the connector connecting portion 17 is positioned above the upper edge 14a of the side wall portion 14 as is apparent from FIG.

  FIG. 2 basically shows a cross section along the center line of the horizontal portion 7B of the connector 7, but the mounting base portion 19 is taken along a cut surface passing through the recess 25 for easy understanding. A cross section is shown.

  In the oil cooler configured as described above, since the connector 7 is made of a synthetic resin, there is no need to consider the bending radius in configuring the L-shape. The vertical dimension can be minimized. For this reason, the protrusion amount H of the connector 7 from the upper edge 14a of the side wall portion 14 of the uppermost core plate 5 is reduced. For example, when installing in an internal combustion engine, an automatic transmission, etc. Can be small.

  FIG. 12 shows a configuration in which a connector 107 formed by bending a metal tube is attached to the top plate 4 on the upper surface of the core 1 as a comparative example. In this case, the cross section of the metal tube is crushed during bending. A minimum bend radius R is required so that no. Therefore, even if the connector connecting portion 117 of the top plate 4 is short as shown in the drawing, the protruding amount H from the side wall portion 14 of the uppermost core plate 5 becomes large, and a large mounting space is required.

  Next, a second embodiment of the connector 7 will be described with reference to FIGS. In addition, the structure by the side of the core part 1 or the top part plate 4 is not different from the Example mentioned above.

  The connector 7 of the second embodiment is an axial direction of the mounting base 19 instead of the recess 25 of the above-described embodiment as a receiving portion for receiving the deformed portion when the connector connecting portion 17 is locally deformed. A weakened portion 41 having a low strength is partially provided at a part thereof. Specifically, as shown in FIG. 9, the fragile portion 41 is configured by recessing a large number of slits 42 from the outer peripheral surface of the mounting base 19 to a certain depth in the radial direction. The slits 42 are formed in parallel with each other in consideration of the mold dividing direction when the connector 7 is injection-molded. Therefore, the slit 42 can be molded at the same time as the connector 7 is molded.

  10 and 11 show a deformation process of the connector connecting portion 17 when the connector 7 of the second embodiment is used. The jig 31 used for the deformation of the connector connecting portion 17 is not particularly different from that shown in FIGS. 6 and 7, and the connector connecting portion 17 is attached between the pair of halves 32 as shown in FIG. After setting together with 19, as shown in FIG. 11, pressing with the push rod 33 is performed. Thereby, the connector connecting portion 17 is locally deformed to the inner peripheral side and enters the fragile portion 41. At this time, in the fragile portion 41 having a large number of slits 42, the thin wall of the synthetic resin remaining between the large number of slits 42 is easily broken or deformed. Therefore, similarly to the above-described embodiment, the locally deformed connector connecting portion 17 bites into the fragile portion 41, and the connector 7 is fixed in both the axial direction and the circumferential direction.

  In the second embodiment, the fragile portion 41 can accept the deformation of the connector connecting portion 17 at any location in the circumferential direction 360 °. Therefore, the attachment posture (direction in which the horizontal portion 7B is directed) of the connector 7 with respect to the core portion 1 illustrated in FIG. 1 is not limited, and the connector 7 can be attached in an arbitrary direction as necessary. In other words, it is possible to use the same synthetic resin connector 7 for various types of oil coolers having different orientation directions of the connector 7. Moreover, the deformation | transformation process using the push rod 33 is attained, for example, without being obstructed by the center oil passage bulging part 16 and the other connector 7.

  As mentioned above, although one Example of this invention was described in detail, this invention is not limited to the oil cooler of the said Example, It is possible to apply to various types of heat exchangers.

DESCRIPTION OF SYMBOLS 1 ... Core part 5 ... Core plate 4 ... Top plate 7 ... Synthetic resin connector 17 ... Connector connection part 19 ... Mounting base 23 ... Seal ring holding groove 24 ... O-ring 25 ... Recessed part 41 ... Fragile part 42 ... Slit

Claims (3)

A plurality of shallow dish-shaped core plates constituting the fluid passage are stacked, and a top plate relatively thicker than the core plate is stacked on the inner peripheral side of the side wall of the uppermost core plate, and the inside of the furnace In a heat exchanger that is brazed to each part by heating with,
The connector connecting portion provided on the top plate is formed in a cylindrical shape with a protruding length protruding above the side wall portion around the uppermost core plate,
A seal ring holding groove is formed on the outer peripheral surface of the base of the synthetic resin connector molded in an L shape in advance, and the seal ring holding groove is adjacent to the seal ring holding groove in the axial direction and is locally located on the inner peripheral side of the connector connecting portion. Forming recesses to accept general deformation at multiple locations in the circumferential direction ,
It is to locally pressed and deformed toward the inner circumferential side a plurality of positions respectively corresponding to the recess located above the aforementioned side wall portions of the connector connecting portion in which the connector is inserted, the connector to the connector connecting portion A heat exchanger fixed to both the axial direction and the circumferential direction and attached to the top plate. A plurality of shallow dish-shaped core plates constituting the fluid passage are stacked, and a top plate relatively thicker than the core plate is stacked on the inner peripheral side of the side wall of the uppermost core plate, and the inside of the furnace In a heat exchanger that is brazed to each part by heating with,
The connector connecting portion provided on the top plate is formed in a cylindrical shape with a protruding length protruding above the side wall portion around the uppermost core plate,
A seal ring holding groove is formed on the outer peripheral surface of the base of the synthetic resin connector molded in an L shape in advance, and the seal ring holding groove is adjacent to the seal ring holding groove in the axial direction and is locally located on the inner peripheral side of the connector connecting portion. Forming a fragile part that accepts general deformation,
The top plate is formed by locally pressing and deforming a plurality of circumferential locations corresponding to the weakened portion located above the side wall portion of the connector connecting portion into which the connector is inserted, toward the inner peripheral side. Attached to the
The fragile portion is formed so as to be partially low in strength by providing a large number of slits in a part of the mounting base outer peripheral surface in the axial direction, and is a locally deformed portion of the connector connecting portion. The heat exchanger in which the connector is fixed to the connector connecting portion in both the axial direction and the circumferential direction by biting into the weakened portion . The heat exchanger is an oil cooler in which oil passages and cooling water passages are alternately configured between a plurality of core plates, and the connector is used for an outlet or an inlet of cooling water. Item 3. The heat exchanger according to Item 1 or 2 .

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