JP2007093188A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of absorbing a thermal strain while securing rigidity. <P>SOLUTION: In this heat exchanger provided with a core part 4 having a plurality of tubes 2 with cooling water flowing therethrough, and connected to outer surfaces of the tubes 2 to promote heat exchange of the cooling water, two header tanks 5 communicated with the tubes 2 in longitudinal-directional both end parts of the tubes 2, and two core plates 5a provided respectively in the two header tanks 5 and joined to the end parts of the tubes 2, elastically deformable beadlike annular protrusion parts 5e are formed successively along a circumference of a junction part with the tubes 2, in the core plate 5a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchanger, and is effective when applied to a so-called multi-flow type radiator that cools cooling water of an internal combustion engine such as a vehicle engine.

  Conventionally, as shown in FIG. 12, the multiflow type radiator includes a plurality of tubes J2, a core portion J4 having fins J3 joined to the outer surfaces of these tubes J2, and a header communicating with the plurality of tubes J2. A tank J5 and an insert J7 disposed at the end of the core portion J4 to reinforce the core portion J4 are provided.

  The header tank J5 is composed of a core plate J5a to which a tube J2 is joined and a tank body (not shown) that constitutes a tank internal space. The tube J2 and the insert J7 are joined to the core plate J5a by brazing while being inserted into the header tank J5.

  In such a radiator, when the temperature difference between the adjacent tubes J2 increases, thermal stress accompanying thermal strain is generated in the tubes J2 and the core plate J5a. And when thermal stress repeatedly generate | occur | produced, there existed a problem that the netting part vicinity with the core plate J5a in the tube J2 destroyed by fatigue.

On the other hand, a heat exchanger has been proposed that absorbs thermal stress by providing a thin thin portion at a portion (joint portion) adjacent to the tube in the core plate and deforming the thin portion (for example, Patent Document 1).
JP 2004-286358 A

  However, the heat exchanger described in Patent Document 1 has a problem in that durability performance is deteriorated because brazing strength and rigidity are reduced by providing a thin portion at the joint portion of the core plate. Furthermore, there is a problem that cracks are generated in the joint portion and leakage of cooling water is likely to occur.

  An object of this invention is to provide the heat exchanger which can absorb a thermal strain, ensuring rigidity, in view of the said point.

  To achieve the above object, in the present invention, a core having a plurality of tubes (2) through which a heat medium flows and fins (3) joined to the outer surface of the tubes (2) to promote heat exchange of the heat medium. A portion (4), two header tanks (5) communicating with the tube (2) at both longitudinal ends of the tube (2), and two header tanks (5), respectively. It is a heat exchanger provided with two core plates (5a) to which end portions are joined, and the core plate (5a) is formed with an elastically deformable bead-shaped protrusion (5e). This is the first feature.

  In this way, by providing the core plate (5a) with the elastically deformable protrusion (5e), when the tube (2) is thermally strained, the protrusion (5e) is deformed to absorb the heat strain. can do. Furthermore, since the thin part is not provided in the core plate (5a), it becomes possible to absorb thermal strain while ensuring the rigidity of the heat exchanger.

  Further, in the first feature, the protrusion can be configured by an annular protrusion (5e) formed continuously along the periphery of the joint with the tube (2) in the core plate (5a).

  Thereby, when thermal distortion occurs in the tube (2), the annular protrusion (5e) is deformed over the entire periphery of the joint portion of the core plate (5a) with the tube (2). Can be absorbed more.

  In the present specification, the term “annular” is used to include not only a complete annular ring having a closed circle but also an incomplete ring in which a part of the circle is missing.

  Further, in this case, the annular protrusion (5e) can be formed around the joint portion with at least one end of all the tubes (2) in the two core plates (5a).

  Thereby, it becomes possible to absorb not only the thermal distortion of a specific part but the thermal distortion of all the tubes (2).

  In addition, the annular protrusions (5e) are formed around the joints with one end of all the tubes (2) in the two core plates (5a), and each of the two core plates (5a) has a tube (2 The annular protrusions (5e) can be alternately formed at the joint between the one end and the other end.

  As a result, the decrease in rigidity of the core plate (5a) due to the provision of the annular protrusion (5e) can be minimized, so that heat distortion can be absorbed while ensuring the rigidity of the heat exchanger. It becomes.

  Moreover, in this invention, the core part (4) which has the several tube (2) through which a heat carrier flows, and the fin (3) joined to the outer surface of a tube (2) and accelerating | stimulating heat exchange of a heat carrier, The two header tanks (5) communicating with the tube (2) at both longitudinal ends of the tube (2) and the two header tanks (5) are provided respectively, and the ends of the tube (2) are joined. The core plate (5a) has a wall portion (5h) inclined toward the tube (2), and the tube (2) is joined to the heat exchanger. And a bottom part (5g) formed between the two joint parts (5f) and arranged parallel to the plate surface of the core plate (5a). In the center, compared to other parts of the core plate (5a) That is thin walled portion (5i) is formed is a second feature.

  Thereby, when a thermal distortion generate | occur | produces in a tube (2), an annular thin part (5i) can deform | transform and can absorb a thermal distortion. At this time, the thickness of only the bottom (5g) of the core plate (5a) is reduced, and the thickness of the junction (5f) to which the tube (2) is joined is not reduced. Therefore, the junction (5f) It is possible to prevent the occurrence of leakage of cooling water. Therefore, it is possible to absorb the thermal strain while ensuring the rigidity of the heat exchanger.

  Further, in the second feature, the thin portion can be configured by an annular thin portion (5i) formed continuously along the periphery of the joint portion (5f) in the core plate (5a).

  As a result, when the thermal strain occurs in the tube (2), the annular thin portion (5i) is deformed over the entire periphery of the joint portion (5f) in the core plate (5a), so that the thermal strain is absorbed more. It becomes possible to do.

  In this case, the annular thin portion (5i) can be formed around the joint portion (5f) with at least one end of all the tubes (2) in the two core plates (5a).

  Thereby, it becomes possible to absorb not only the thermal distortion of a specific part but the thermal distortion of all the tubes (2).

  In addition, the annular thin wall portion (5i) is formed around the joint portion (5f) with one end of all the tubes (2) in the two core plates (5a), and in each of the two core plates (5a), The annular thin portions (5i) can be alternately formed around the joint (5f) between one end and the other end of the tube (2).

  As a result, the decrease in rigidity of the core plate (5a) due to the provision of the annular thin part (5i) can be minimized, so that heat strain can be absorbed while ensuring the rigidity of the heat exchanger. It becomes.

  In the second feature, the thin portion (5i) can be formed substantially parallel to the longitudinal direction of the cross section of the tube (2).

  Thereby, since the area of the part where the plate thickness in the core plate (5a) becomes thin can be reduced, the decrease in the rigidity of the core plate (5a) due to the provision of the thin portion (5i) can be minimized. it can. Therefore, it is possible to absorb thermal strain while further ensuring the rigidity of the heat exchanger.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the heat exchanger according to the present invention is applied to a radiator 1 that performs heat exchange between cooling water (heat medium) that cools a vehicle engine and air (air). FIG. 1 is a front view of the radiator 1 according to the first embodiment, FIG. 2 is a plan view of the radiator 1 according to the first embodiment, and FIG. 3 is an enlarged view showing a main part of the first embodiment. is there.

  In FIG. 1, a tube 2 is a tube through which cooling water flows. The tube 2 is formed in a flat shape so that the air flow direction (perpendicular to the paper surface) coincides with the major axis direction, and the longitudinal direction thereof is A plurality of lines are arranged in parallel in the horizontal direction so as to coincide with the vertical direction.

  In addition, fins 3 formed in a wave shape are joined to the flat surfaces on both sides of the tube 2, and the heat transfer area with the air is increased by the fins 3 to promote heat exchange between the cooling water and the air. Yes. Hereinafter, the substantially rectangular heat exchanging portion including the tube 2 and the fin 3 is referred to as a core portion 4.

  As shown in FIGS. 1 and 2, the header tank 5 has a longitudinal direction end portion (in this embodiment, a horizontal direction end portion) of the tube 2 in a direction orthogonal to the longitudinal direction of the tube 2 (in this embodiment, The header tank 5 includes a core plate 5a into which the tubes 2 are inserted and joined, and a tank body 5b that constitutes a tank internal space together with the core plate 5a. Configured. In the first embodiment, the core plate 5a is made of metal (for example, aluminum alloy), and the tank body 5b is made of resin.

  Further, as shown in FIG. 3, a packing (not shown) made of an elastic material such as rubber is disposed in a concave groove 5c provided on the entire periphery of the edge of the core plate 5a, and the tank body 5b is formed by this packing. And the core plate 5a are hermetically sealed. A claw portion 5d is erected on the peripheral edge of the core plate 5a. The tank main body 5b is assembled to the core plate 5a by caulking and fixing the claw portion 5d to a flange formed on the outer peripheral edge of the tank main body 5b. It has been.

  The header tank 5 is provided with a cooling water inlet 6a connected to a cooling water outlet side of an engine (not shown) and a cooling water outlet 6b connected to a cooling water inlet side of the engine.

  At both ends of the core portion 4, inserts 7 that extend substantially in parallel with the longitudinal direction of the tube 2 and reinforce the core portion 4 are provided. The insert 7 includes a base portion 7a having a surface substantially parallel to the flat surface 2a of the tube 2 and extending substantially parallel to the longitudinal direction of the tube 2, and a direction substantially orthogonal to the base portion 7a (in this embodiment). And ribs 7b extending in the horizontal direction and extending substantially parallel to the longitudinal direction of the tube 2.

  4 is a cross-sectional view taken along line AA in FIG. 2, FIG. 5 is a cross-sectional view taken along line BB in FIG. 2, FIG. 6 is a cross-sectional view taken along CC in FIG. It is. In FIG. 4, the fin 3 is not shown, and the tank body 5b is not shown in FIGS.

  As shown in FIGS. 3 to 7, an annular protrusion 5 e is continuously formed around the joint portion with the tube 2 on the core plate 5 a. The annular protrusion 5e has a bead shape and has a semicircular cross section. The core plate 5a is elastically deformable at the annular protrusion 5e. The annular projecting portion 5 e protrudes toward the outside of the header tank 5, that is, toward the center side of the core portion 4. Further, the annular protrusion 5 e is provided on the core plate 5 a joined to one end of all the tubes 2.

  As shown in FIG. 5, the annular protrusion 5e is provided on every other tube 2 on the core plate 5a. And as shown in FIG. 4, in the two core plates 5a, the positions where the annular protrusions 5e are provided are shifted one by two. For this reason, in the adjacent tube 2, the annular protrusion part 5e is provided in the circumference | surroundings of the core plate 5a to which the different edge part was joined alternately. In other words, in the two core plates 5a, the annular protrusions 5e are alternately formed at the joint between one end and the other end of the tube 2, respectively.

  FIG. 8 is a cross-sectional view showing a state of the core plate 5a when a temperature difference is generated between adjacent tubes 2 according to the first embodiment. FIG. 8A shows a case where a tensile strain occurs. b) shows a case where compression distortion occurs.

  As shown in FIGS. 8A and 8B, when thermal strain is generated due to a temperature difference between the adjacent tubes 2, the thermal strain generated by the deformation of the annular protrusion 5e is absorbed. This prevents the root portion (joint portion) between the tube 2 and the core plate 5a from being deformed by thermal strain.

  As described above, by providing the core plate 5a with the elastically deformable annular protrusion 5e, the annular protrusion 5e can be deformed to absorb the thermal strain when thermal distortion occurs. Furthermore, since the thin part is not provided in the core plate 5a, it is possible to absorb thermal strain while ensuring the rigidity of the radiator 1.

  In addition, by forming the annular protrusion 5e continuously along the periphery of the joint portion with the tube 2 in the core plate 5a, when the tube 2 is subjected to thermal strain, the annular protrusion 5e Therefore, it is possible to absorb the thermal strain more.

  Further, by providing the annular protrusion 5e on the core plate 5a joined to one end of all the tubes 2, it is possible to absorb not only the thermal strain of a specific part but also the thermal strain of all the tubes 2. Become.

  By the way, when the temperature is extremely low, there may be a drift phenomenon in which cooling water concentrates on the tube 2 near the cooling water inlet 6a and the cooling water hardly flows in the tube 2 far from the cooling water inlet 6a. At this time, the temperature difference between the adjacent tubes 2 becomes large at the drift boundary portion, and thermal distortion occurs.

  The drift position varies depending on the position of the cooling water inlet 6a and the radiator 1 passing wind speed distribution (design shape, opening shape). Therefore, as in this embodiment, by providing the annular projection 5e on the core plate 5a joined to one end of all the tubes 2, the thermal distortion of the tubes 2 can be absorbed regardless of where the drift occurs. can do. For this reason, there is no restriction on the position where the cooling water inlet 6a is arranged, and the degree of freedom in design can be increased.

  Moreover, if the annular protrusion 5e is provided, the rigidity of the core plate 5a may be reduced. Therefore, as in the present embodiment, in the adjacent tubes 2, by providing the annular protrusions 5e around the core plate 5a where the different ends are alternately joined, the rigidity is reduced by providing the annular protrusions 5e. Can be minimized. Thereby, it becomes possible to absorb the thermal strain while ensuring the rigidity of the radiator 1.

(Second Embodiment)
Next, a second embodiment of the present invention will be described based on FIG. 9 and FIG. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  9 is a cross-sectional view taken along the line BB in FIG. 2 according to the second embodiment, and FIG. 10 is a cross-sectional view taken along the line EE in FIG. In FIG. 9, for convenience of explanation, the annular thin portion 5 i is illustrated using diagonal lines. In FIG. 10, the tank body 5b is not shown.

  As shown in FIGS. 9 and 10, the core plate 5a is formed with a joint portion 5f to which the longitudinal ends of the tube 2 or the insert 7 are joined. The joint portion 5f has a wall portion 5h inclined with respect to the tube 2 so that the tube 2 side becomes a convex portion protruding toward the inside of the header tank 5, that is, the outside of the core portion 4.

  Further, a bottom portion 5g disposed in parallel with the plate surface of the core plate 5a (a surface orthogonal to the longitudinal direction of the tube 2) is formed between the two joint portions 5f of the core plate 5a.

  At the center of the bottom 5g, an annular thin portion 5i is formed which is thinner than the thickness of other portions of the core plate 5a. The annular thin portion 5i is continuously formed around the joint portion 5f in the core plate 5a. The core plate 5a is elastically deformable at the annular thin portion 5i. The annular thin portion 5 i is provided on the core plate 5 a joined to one end of all the tubes 2.

  The annular thin portion 5i is provided on every other tube 2 on the core plate 5a. In the two core plates 5a, the positions where the annular thin portions 5i are provided are shifted one by two. For this reason, in the adjacent tube 2, the annular thin part 5i is provided in the circumference | surroundings of the core plate 5a to which the different edge part was joined alternately. In other words, in the two core plates 5a, the annular thin portions 5i are alternately formed around the joint portion 5f between the one end portion and the other end portion of the tube 2 respectively.

  As described above, by providing the thin annular thin portion 5i on the bottom 5g of the core plate 5a, the annular thin portion 5i is deformed to absorb the thermal strain when thermal distortion occurs in the tube 2. be able to. At this time, the thickness of only the bottom portion 5g in the core plate 5a is reduced, and the thickness of the joint portion 5f to which the tube 2 or the like is joined is not reduced, so that leakage of cooling water at the joint portion 5f is prevented. can do. Therefore, it is possible to absorb thermal strain while ensuring the rigidity of the radiator 1.

  In addition, by forming the annular thin portion 5i continuously along the periphery of the joint portion 5f at the bottom portion 5g, the annular thin portion 5i is arranged around the entire circumference of the joint portion 5f when thermal distortion occurs in the tube 2. Therefore, the thermal strain can be absorbed more.

  Further, by providing the annular thin portion 5i on the core plate 5a joined to one end of all the tubes 2, it is possible to absorb not only the thermal strain of a specific part but also the thermal strain of all the tubes 2. Become. Furthermore, the thermal strain of the tube 2 can be absorbed regardless of the position where the drift occurs. For this reason, there is no restriction on the position where the cooling water inlet 6a is arranged, and the degree of freedom in design can be increased.

  Further, when the annular thin portion 5i is provided, the rigidity of the core plate 5a may be reduced. Therefore, as in the present embodiment, in the adjacent tubes 2, the annular thin portion 5 i is provided by providing the annular thin portion 5 i around the joint portion 5 f of the core plate 5 a in which different ends are alternately joined. It is possible to minimize the decrease in rigidity due to the above. Thereby, it becomes possible to absorb the thermal strain while ensuring the rigidity of the radiator 1.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment is different from the second embodiment in that the thin portion is provided in a straight line. The same parts as those in the second embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 11 is a cross-sectional view taken along the line BB in FIG. 2 according to the third embodiment. In FIG. 11, for convenience of explanation, the thin portion 5 i is illustrated using diagonal lines.

  As shown in FIG. 11, the thin portion 5 i is formed in the bottom portion 5 g substantially parallel to the transverse section of the tube 2, that is, the longitudinal direction of the section orthogonal to the cooling water flow direction of the tube 2. At this time, the thin portion 5i is linear.

  As described above, by providing the thin portion 5i having a thin plate thickness at the bottom portion 5g of the core plate 5a, when the thermal strain is generated in the tube 2, the thin portion 5i is deformed to absorb the thermal strain. it can. In addition, by providing the thin portion 5i in a straight line, the area of the portion of the core plate 5a where the plate thickness is reduced can be reduced as compared with the case where the thin portion is provided in an annular shape. Can be minimized. Therefore, it is possible to absorb the thermal strain while further ensuring the rigidity of the radiator 1.

(Other embodiments)
In addition, in the said 1st Embodiment, although the annular protrusion 5e was provided in the circumference | surroundings of the junction part with the one end side of all the tubes 2 in the core plate 5a, around the junction part with the both ends of the tube 2 It may be provided. Moreover, you may provide the cyclic | annular protrusion part 5e only in the circumference | surroundings of the junction part with the one part tube 2 considered that the thermal distortion in the core plate 5a generate | occur | produces.

  Similarly, in the second embodiment, the annular thin portion 5i is provided around the joint portion 5f with one end side of all the tubes 2 in the core plate 5a, but the joint portion 5f with both ends of the tube 2 is provided. You may provide around. Moreover, you may provide the annular thin part 5i only around the junction part 5f with the one part tube 2 considered that the thermal distortion in the core plate 5a generate | occur | produces.

  Moreover, in the said 1st Embodiment, although the projection part was provided in cyclic | annular form, it is not restricted to this, If the projection part is provided at least between the two tubes 2 in the core plate 5a or between the tube 2 and the insert 7, Good.

It is a front view of radiator 1 concerning a 1st embodiment. It is a top view of radiator 1 concerning a 1st embodiment. It is an enlarged view which shows the principal part of the radiator 1 which concerns on 1st Embodiment. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. 2 which concerns on 1st Embodiment. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is sectional drawing which shows the state of the core plate 5a when a temperature difference arises between the adjacent tubes 2 which concern on 1st Embodiment, (a) is a case where a distortion of a tension | tensile_strength arises, (b) is a distortion of a compression. It shows the case where occurs. It is BB sectional drawing of FIG. 2 which concerns on 2nd Embodiment. It is EE sectional drawing of FIG. It is BB sectional drawing of FIG. 2 which concerns on 3rd Embodiment. It is an enlarged view which shows the principal part of the conventional radiator 1. FIG.

Explanation of symbols

  2 ... tube, 3 ... fin, 4 ... core part, 5 ... header tank, 5a ... core plate, 5e ... annular protrusion (projection part), 5f ... joint part, 5g ... bottom part, 5i ... annular thin part (thin part) ).

Claims (9)

A core portion (4) having a plurality of tubes (2) through which a heat medium flows, and fins (3) joined to an outer surface of the tube (2) to promote heat exchange of the heat medium; 2) are provided in two header tanks (5) communicating with the tube (2) at both ends in the longitudinal direction and the two header tanks (5), respectively, and the ends of the tubes (2) are joined. A heat exchanger comprising two core plates (5a),
The core plate (5a) is formed with a bead-shaped protrusion (5e) that can be elastically deformed. The said protrusion part is an annular protrusion part (5e) continuously formed along the circumference | surroundings of a junction part with the said tube (2) in the said core plate (5a), The Claim 1 characterized by the above-mentioned. The described heat exchanger. The said annular projection part (5e) is formed in the circumference | surroundings of a junction part with the at least one end of all the said tubes (2) in the said two core plates (5a). Heat exchanger. The annular protrusion (5e) is formed around the joint portion with one end of all the tubes (2) in the two core plates (5a),
In the two core plates (5a), the annular protrusions (5e) are alternately formed at the joints between one end and the other end of the tube (2). The heat exchanger according to claim 2. A core portion (4) having a plurality of tubes (2) through which a heat medium flows, and fins (3) joined to an outer surface of the tube (2) to promote heat exchange of the heat medium; 2) are provided in two header tanks (5) communicating with the tube (2) at both ends in the longitudinal direction and the two header tanks (5), respectively, and the ends of the tubes (2) are joined. A heat exchanger comprising two core plates (5a),
The core plate (5a) has a wall portion (5h) inclined toward the tube (2), a joint portion (5f) to which the tube (2) is joined, and the two joint portions (5f). ) And a bottom portion (5g) disposed in parallel with the plate surface of the core plate (5a),
A heat exchanger, wherein a thin portion (5i) having a smaller thickness than other portions of the core plate (5a) is formed at a central portion of the bottom portion (5g). The heat according to claim 5, wherein the thin portion is an annular thin portion (5i) formed continuously along the periphery of the joint portion (5f) in the core plate (5a). Exchanger. The annular thin portion (5i) is formed around the joint portion (5f) with at least one end of all the tubes (2) in the two core plates (5a). Item 7. The heat exchanger according to item 6. The annular thin part (5i) is formed around the joint (5f) with one end of all the tubes (2) in the two core plates (5a),
In the two core plates (5a), the thin annular portions (5i) are alternately formed around the joint (5f) between one end and the other end of the tube (2). The heat exchanger according to claim 6. The heat exchanger according to claim 5, wherein the thin portion (5i) is formed substantially parallel to a longitudinal direction of a cross section of the tube (2).

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