JP5029166B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger, and is effective when applied to a radiator that cools cooling water by exchanging heat between cooling water and air of a water-cooled internal combustion engine.

  In the conventional heat exchanger, a large number of tubes and a large number of corrugated fins are alternately stacked to constitute a core portion. And the tank is arrange | positioned at the edge part of the tube longitudinal direction of a tube. The tank includes a core plate into which a tube is inserted and a tank portion that is caulked and fixed to the core plate to form a space in the tank together with the core plate.

In the core plate, a tube insertion hole into which a tube is inserted is formed in the tube joint surface, and a wall portion that is bent substantially perpendicular to the tube joint surface is formed on the outer periphery of the tube joint surface. Furthermore, a rib is formed on the tube joint surface of the core plate in parallel with the tube insertion hole, and both ends of the rib are connected to the wall portion, thereby increasing the rigidity of the core plate and mainly deforming the core plate due to internal pressure. (See, for example, Patent Document 1).
JP 2004-219044 A

  By the way, as shown in FIG. 10, in the heat exchanger in which the rib is not formed in the core plate 20, when a temperature difference occurs between the adjacent tubes 10, the tube joining surface 22 of the core plate 20 is in the tube longitudinal direction. There is a problem that X is deformed like a bow and stress concentrates on the tube root portion (that is, both end portions of the tube 10 in the tube width direction Z) which is a bending point portion.

  On the other hand, when a rib is formed on the core plate as in the heat exchanger described in Patent Document 1, concentration of stress on the bending point is avoided, but the core plate is in the longitudinal direction of the tube. Since it is hard to deform | transform, there exists a problem that a high stress generate | occur | produces in the whole tube width direction of a tube. Moreover, when the both ends of a rib are connected to a wall part like the heat exchanger described in patent document 1, the tube width direction length of a rib becomes long, and when forming a core plate by press work, for example There is a problem that the moldability of the ribs is poor.

  In view of the above points, an object of the present invention is to improve the moldability of a rib while preventing stress concentration at both ends of the tube in the tube width direction.

  In the first feature of the present invention, in the heat exchanger in which the flat tube (10) is inserted and joined into the tube insertion hole (221) of the tube joining surface (22), a plurality of tubes are joined to the tube joining surface (22). A rib (223) is formed, and the length of the rib (223) in the tube width direction (Z) is shorter than the length of the tube insertion hole (221) in the tube width direction (Z), and in the tube stacking direction (Y). When viewed, the end of the tube insertion hole (221) in the tube width direction (Z) and the rib (223) overlap, and the tube joint surface (22) has a tube width of the rib (223). It is set as the structure which the deformation | transformation permission part (224) which makes easy a deformation | transformation to the tube longitudinal direction (X) of a tube joint surface (22) exists in the site | part outside the edge part of a direction (Z).

  In such a configuration, when a temperature difference occurs between the tubes (10), deformation of both ends in the tube width direction (Z) of the tube insertion hole (221) is prevented by the rib (223). 10), it is possible to prevent stress concentration on both ends in the tube width direction (Z).

  Further, when a temperature difference is generated between the tubes (10), the deformation allowable portion (224) is easily deformed, so that the thermal strain of the tube (10) is absorbed.

  Furthermore, since the length of the rib (223) in the tube width direction (Z) is shortened, the moldability of the rib (223) can be improved.

  In this case, the length (L3) in the tube width direction (Z) from the tube width direction (Z) end of the tube insertion hole (221) to the tube width direction (Z) end of the rib (223) is 3 It can be in the range of ~ 8 mm.

  If it does in this way, when a temperature difference generate | occur | produces between tubes (10), the stress concentration to the both ends of the tube width direction (Z) of a tube (10) can be prevented reliably.

  In this case, when the portion between the adjacent tube insertion holes (221) on the tube joint surface (22) is the portion between the insertion holes, ribs (223) can be provided at all the portions between the insertion holes.

  In this way, it is possible to more reliably prevent deformation of both ends of the tube insertion hole (221) in the tube width direction (Z).

  In this case, the rib (223) can be provided only in a part of the inter-insertion hole parts.

  In this way, the moldability of the rib (223) can be improved as compared with the case where the rib (223) is provided at all the positions between the insertion holes.

  Further, in this case, the portion between the insertion holes provided with the rib (223) and the portion between the insertion holes not provided with the rib (223) may be alternately arranged along the tube stacking direction (Y). it can.

  In this case, since the number of ribs (223) is reduced, the moldability of the ribs (223) can be improved as compared with the case where the ribs (223) are provided at all the positions between the insertion holes.

  Further, in this case, one insertion hole portion where the rib (223) is provided and two insertion hole portions where the rib (223) is not provided alternately along the tube stacking direction (Y). Can be arranged.

  In this case, since the number of ribs (223) is reduced, the moldability of the ribs (223) can be improved as compared with the case where the ribs (223) are provided at all the positions between the insertion holes.

  Further, in this case, the portion between the insertion holes in which the rib (223) is provided only on one end side in the tube width direction (Z) of the tube insertion hole (221), and the tube width direction (Z) of the tube insertion hole (221). The portions between the insertion holes in which the ribs (223) are provided only on the other end side can be alternately arranged along the tube stacking direction (Y).

  In this case, since the number of ribs (223) is reduced, the moldability of the ribs (223) can be improved as compared with the case where two ribs (223) are provided at all the positions between the insertion holes.

  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)
In this embodiment, the heat exchanger according to the present invention is applied to a radiator for cooling a water-cooled internal combustion engine, and FIG. 1 is a front view of the heat exchanger according to the first embodiment of the present invention. 2 is a perspective sectional view of a tank and a tube in the heat exchanger of FIG. 1, FIG. 3A is a front view of the core plate alone of FIG. 2, FIG. 3B is a bottom view of FIG. Is a sectional view taken along line AA in FIG. 3, and FIG. 5 is a sectional view taken along line BB in FIG.

  As shown in FIGS. 1 and 2, the heat exchanger includes a rectangular parallelepiped core portion 1, and the core portion 1 includes a large number of tubes 10 and a large number of corrugated fins 11 stacked alternately in the vertical direction. Configured. The stacking direction of the tube 10 and the corrugated fin 11 is hereinafter referred to as a tube stacking direction Y.

  The corrugated fins 11 are made of an aluminum alloy and are formed in a corrugated shape to promote heat exchange between air and cooling water.

  The tube 10 has a passage through which cooling water of a water-cooled internal combustion engine (not shown) mounted on the vehicle flows, and is formed by bending or welding or brazing an aluminum alloy plate material into a predetermined shape. Is done.

  In this embodiment, the tube 10 has a flat shape in which the longitudinal direction (hereinafter referred to as the tube longitudinal direction X) coincides with the horizontal direction and the cross-sectional shape thereof coincides with the air flow direction C. Is formed. The direction orthogonal to both the tube stacking direction Y and the tube longitudinal direction X is hereinafter referred to as a tube width direction Z. Incidentally, the tube width direction Z coincides with the major axis direction of the tube 10 and the air flow direction C.

  On both ends of the tube 10 in the tube longitudinal direction X, tanks 2 and 3 extending in a direction substantially orthogonal to the tube longitudinal direction X and having a space formed therein are disposed. The ends of the tubes 10 in the tube longitudinal direction X are joined to the tanks 2 and 3 by being inserted into tube insertion holes (details will be described later), and the internal passages of the tubes 10 and the spaces in the tanks 2 and 3 And communicate with each other.

  One tank 2 distributes and supplies the high-temperature cooling water flowing out from the engine to a number of tubes 10. The one tank 2 is provided with an inlet pipe 2a connected to the cooling water outlet side of the internal combustion engine via a hose (not shown).

  The other tank 3 collects and collects the cooling water cooled by heat exchange with air and drains it toward the internal combustion engine. The other tank 3 is provided with an outlet pipe 3a connected to the cooling water inlet side of the internal combustion engine via a hose.

  Side plates 4 that reinforce the core portion 1 are disposed at both ends of the core portion 1 in the tube stacking direction Y. The side plate 4 is made of an aluminum alloy, extends in a direction parallel to the tube longitudinal direction X, and both ends thereof are connected to the tanks 2 and 3.

  The tanks 2 and 3 have a core plate 20 in which the tube 10 and the side plate 4 are inserted and fixed, a tank portion 21 that forms a space 2b in the tanks 2 and 3 together with the core plate 20, and a packing (not shown). Configured.

  In the present embodiment, the core plate 20 is made of an aluminum alloy, the tank portion 21 is made of a resin such as glass fiber reinforced nylon 66, and the rubber packing for maintaining hermeticity is bonded to the core plate 20 and the tank portion 21. In a state of being sandwiched between them, a protruding portion of a core plate 20 described later is plastically deformed so as to press against the tank portion 21, and the tank portion 21 is caulked and fixed to the core plate 20.

  As shown in FIGS. 3 to 5, the core plate 20 has a tube joining surface 22 to which a tube is joined, and the cross section of the end of the tank portion 21 and the packing is inserted around the tube joining surface 22. A rectangular groove 20a is formed over the entire circumference.

  The groove 20a is formed by three surfaces. That is, an inner wall portion 23 that is bent substantially vertically from the outer peripheral portion of the tube joining surface 22 and extends in the tube longitudinal direction X, and a bottom wall portion 24 that is bent substantially vertically from the inner wall portion 23 and extends in the tube stacking direction Y. A groove 20 a is formed by the outer wall portion 25 that is bent substantially perpendicularly from the bottom wall portion 24 and extends in the tube longitudinal direction X. A large number of protruding pieces 251 are formed at the end of the outer wall portion 25.

  A number of tube insertion holes 221 into which the tube 10 is inserted and brazed are formed along the tube stacking direction Y on the tube joint surface 22 of the core plate 20. Further, one side plate insertion hole 222 into which the side plate 4 is inserted and brazed is formed on each end of the tube joining surface 22 in the tube stacking direction Y. The tube insertion hole 221 and the side plate insertion hole 222 are elongated in the tube width direction Z, and are formed by punching.

  Further, the tube joining surface 22 has an elongated shape in the tube width direction Z between the adjacent tube insertion holes 221 and between the tube insertion holes 221 and the side plate insertion holes 222 and from the tube joining surface 22 to the outside of the tank. The convex rib 223 is formed by, for example, pressing. Moreover, when the site | part between the tube insertion holes 221 adjacent in the tube junction surface 22 is made into the site | part between insertion holes, the two ribs 223 are provided in all the site | parts between insertion holes.

  The tube width direction length L1 of the rib 223 is shorter than the tube width direction length L2 of the tube insertion hole 221. Further, when viewed in the tube stacking direction Y, the ends of the tube insertion holes 221 in the tube width direction Z and the ribs 223 overlap.

  Further, the end portion of the rib 223 in the tube width direction Z does not reach the inner wall portion 23. Therefore, the tube joining surface 22 has a flat surface 224 that is outside the ends of the insertion holes 221 and 222 and the ribs 223 in the tube width direction Z and over the entire region in the tube stacking direction Y. . The flat surface 224 facilitates deformation of the tube joining surface 22 in the tube longitudinal direction X, as will be described later, and corresponds to a deformation allowing portion of the present invention.

  Next, the effect of this embodiment is demonstrated.

  In this embodiment, when viewed in the tube stacking direction Y, the end of the tube insertion hole 221 in the tube width direction Z and the highly rigid rib 223 overlap, so that there is a temperature difference between the tubes 10. Even if it occurs, deformation of both ends of the tube insertion hole 221 in the tube width direction Z is prevented by the ribs 223, and stress concentration on both ends of the tube 10 in the tube width direction Z can be prevented.

  Further, the flat surface 224 existing outside the end portions of the insertion holes 221 and 222 and the ribs 223 in the tube width direction Z can be easily deformed in the tube longitudinal direction X. Therefore, when the temperature difference between the tubes 10 is large, the core plate 20 is deformed in the tube longitudinal direction X by the deformation of the flat surface 224, and the deformation of the tube 10 is absorbed by the deformation.

  Further, the tube width direction length L1 of the rib 223 is set to a length necessary for preventing deformation of both ends of the tube insertion hole 221 in the tube width direction Z. That is, since the tube width direction length L1 of the rib 223 is shortened, the moldability of the rib 223 can be improved.

  Incidentally, by setting the relationship between the tube width direction length L1 of the rib 223 and the tube width direction length L2 of the tube insertion hole 221 to 0.08 · L2 ≦ L1 ≦ 0.2 · L2, the tube 10 The effect of preventing stress concentration at both ends in the tube width direction Z and the effect of improving the moldability of the ribs 223 can be achieved at the same time.

  In addition, since two ribs 223 are provided at all the insertion hole portions, in other words, since the ribs 223 are arranged close to both ends in the tube width direction Z of all the tube insertion holes 221, It is possible to reliably prevent deformation of both ends of the tube insertion hole 221 in the tube width direction Z.

  Here, for the radiator of the present embodiment configured as described above, the length in the tube width direction Z from the end in the tube width direction Z in the tube insertion hole 221 to the end in the tube width direction Z outside in the rib 223 is When the rib protrusion length L3 is set, a desirable range of the rib protrusion length L3 was examined.

  FIG. 6 shows the result of the study. The horizontal axis is the rib protrusion length L3, and the vertical axis is the generated stress ratio where the stress generated at the root portion of the tube 10 when the rib 223 is not provided is 100%. .

  As is clear from FIG. 6, when the rib protrusion length L3 is in the range of 3 to 8 mm, the stress generated at the root portion of the tube 10 is reduced as compared with the case where the rib 223 is not provided. Therefore, when a temperature difference occurs between the tubes 10, it is possible to reliably prevent stress concentration at both ends of the tube 10 in the tube width direction Z. Further, by setting the rib protrusion length L3 within the range of 4 to 8 mm, when a temperature difference occurs between the tubes 10, stress concentration at both ends in the tube width direction Z of the tube 10 can be prevented more reliably. be able to.

(Second Embodiment)
A second embodiment of the present invention will be described. FIG. 7 is a schematic view showing a single core plate in a heat exchanger according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

In the first embodiment, two ribs 223 are provided in all the inter-insertion hole parts, but in this embodiment, the ribs 223 are provided only in some of the inter-insertion part parts. . Specifically, as shown in FIG. 7 , the portions between the insertion holes provided with two ribs 223 and the portions between the insertion holes not provided with the ribs 223 are alternately arranged along the tube stacking direction Y. is doing. In other words, every other rib 223 is provided at the portion between the insertion holes.

  Although not shown in the drawing, one insertion hole portion provided with two ribs 223 and two insertion hole portions not provided with the rib 223 are alternately arranged along the tube stacking direction Y. Also good. In other words, the ribs 223 may be provided only at one portion between the three insertion holes.

  In this case, since the number of ribs 223 is reduced, the moldability of the ribs 223 can be improved as compared with the case where the ribs 223 are provided at all the positions between the insertion holes.

(Third embodiment)
A third embodiment of the present invention will be described. FIG. 8 is a schematic view showing a single core plate in a heat exchanger according to the third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

In the first embodiment, two ribs 223 are provided at each portion between the insertion holes. However, in this embodiment, one rib 223 is provided at each portion between the insertion holes. Specifically, as shown in FIG. 8 , the portion between the insertion holes in which the rib 223 is provided only on one end side in the tube width direction Z of the tube insertion hole 221 and the other end of the tube insertion hole 221 in the tube width direction Z. The portions between the insertion holes provided with the ribs 223 only on the side are alternately arranged along the tube stacking direction Y.

  In this case, since the number of ribs 223 is reduced, the moldability of the ribs 223 can be improved as compared with the case where two ribs 223 are provided at all the positions between the insertion holes.

(Fourth embodiment)
A fourth embodiment of the present invention will be described. FIG. 9 is a schematic view showing a single core plate in a heat exchanger according to the fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  In the first embodiment, when viewed in the tube stacking direction Y, the end portion of the tube insertion hole 221 in the tube width direction Z and the rib 223 overlap, but they may not overlap. Good.

  That is, in this embodiment, as shown in FIG. 9, the ribs 223 are arranged in the vicinity of the tube insertion hole 221 on the outer side in the tube width direction Z than both ends of the tube insertion hole 221 in the tube width direction Z. More specifically, the ribs 223 are arranged one by one on both end sides of all the tube insertion holes 221. Further, the rib 223 and the tube insertion hole 221 are arranged in series along the tube width direction Z.

  In this way, the stress generated in the vicinity of both ends in the tube width direction Z of the tube insertion hole 221 is distributed to the ribs 223, so that the tube in the tube insertion hole 221 when a temperature difference occurs between the tubes 10 is obtained. Deformation of both ends in the width direction Z is prevented by the ribs 223, and consequently stress concentration on both ends of the tube 10 in the tube width direction Z can be prevented.

  Moreover, since the tube width direction Z length of the rib 223 can be shortened, the moldability of the rib 223 can be improved.

  Further, even when the pitch between adjacent tube insertion holes 221 is narrow, the ribs 223 can be easily arranged.

It is a front view of the heat exchanger which concerns on 1st Embodiment of this invention. It is a perspective sectional view of a tank and a tube in the heat exchanger of FIG. (A) is the front view of the core plate single-piece | unit of FIG. 2, (b) is a bottom view of (a). It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. FIG. 6 is a diagram illustrating a relationship between a rib protrusion length L3 and a stress generated in a root portion of a tube 10; It is a typical figure showing the core plate simple substance in the heat exchanger concerning a 2nd embodiment of the present invention. It is a schematic diagram which shows the core plate single-piece | unit in the heat exchanger which concerns on 3rd Embodiment of this invention. It is a schematic diagram which shows the core plate single-piece | unit in the heat exchanger which concerns on 4th Embodiment of this invention. It is a figure which shows typically the deformation | transformation state of the core plate and tube in the conventional heat exchanger.

Explanation of symbols

  2, 3 ... Tank, 10 ... Tube, 22 ... Tube joint surface, 221 ... Tube insertion hole, 223 ... Rib, 224 ... Flat surface (deformable part), X ... Tube longitudinal direction, Y ... Tube stacking direction, Z … Tube width direction.

Claims (7)

A flat tube (10) arranged in multiple layers;
A tank (2, 3) disposed at the end of the tube (10) in the tube longitudinal direction (X) and communicating with the multiple tubes (10);
In the heat exchanger in which the end of the tube (10) in the tube longitudinal direction (X) is inserted and joined to the tube insertion hole (221) of the tube joining surface (22) in the tank (2, 3),
When the direction perpendicular to both the tube stacking direction (Y) and the tube longitudinal direction (X) is the tube width direction (Z),
A plurality of ribs (223) extending in the tube width direction (Z) are formed on the tube joining surface (22),
The length of the rib (223) in the tube width direction (Z) is shorter than the length of the tube insertion hole (221) in the tube width direction (Z),
When viewed in the tube stacking direction (Y), the end of the tube insertion hole (221) in the tube width direction (Z) and the rib (223) overlap,
Furthermore, on the tube joining surface (22), the tube joining surface (22) in the tube longitudinal direction (X) is positioned outside the end portion of the rib (223) in the tube width direction (Z). A heat exchanger characterized in that there is a deformable portion (224) that facilitates deformation.   The length (L3) in the tube width direction (Z) from the tube width direction (Z) end of the tube insertion hole (221) to the tube width direction (Z) end of the rib (223) is 3 to 3. The heat exchanger according to claim 1, wherein the heat exchanger is within a range of 8 mm.   When the portion between the tube insertion holes (221) adjacent to each other on the tube joining surface (22) is defined as a portion between the insertion holes, the rib (223) is provided in all the portions between the insertion holes. The heat exchanger according to claim 1 or 2.   When the portion between the tube insertion holes (221) adjacent to each other on the tube joint surface (22) is defined as the portion between the insertion holes, only the rib ( 223) is provided, The heat exchanger of Claim 1 or 2 characterized by the above-mentioned.   The portion between the insertion holes provided with the rib (223) and the portion between the insertion holes not provided with the rib (223) are alternately arranged along the tube stacking direction (Y). The heat exchanger according to claim 4.   One portion between the insertion holes provided with the rib (223) and two portions between the insertion holes not provided with the rib (223) are alternately arranged along the tube stacking direction (Y). The heat exchanger according to claim 4, wherein the heat exchanger is provided.   When the portion between the tube insertion holes (221) adjacent to each other on the tube joining surface (22) is defined as the portion between the insertion holes, the rib is provided only on one end side in the tube width direction (Z) of the tube insertion hole (221). The portion between the insertion holes provided with (223) and the portion between the insertion holes provided with the rib (223) only on the other end side in the tube width direction (Z) of the tube insertion hole (221). The heat exchanger according to any one of claims 1 to 3, wherein the heat exchanger is alternately arranged along a tube stacking direction (Y).

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