JP2006200770A - Stacked heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stacked heat exchanger of high quality capable of improving brazing performance of tube formation plates and an inner fin, and free from formation of a bypass flow channel or the like, while preventing the impairing of manufacturing efficiency and the cost up. <P>SOLUTION: In this stacked heat exchanger formed by alternately stacking tubes in which a plurality of fluid passages are formed by joining the tube formation plates, and the inner fin composed of fluid flow channel-forming portions located in the fluid flow passages and a connecting portion for connecting the fluid flow channel-forming portions with each other, is inserted, and outer fins, the connecting portion of the inner fin is formed in a state of being inclined to an inner wall of the tube formation plate and capable of being partially kept into contact with the inner wall. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laminated heat exchanger in which tubes having inner fins and outer fins are alternately laminated.

  2. Description of the Related Art Conventionally, a laminated heat exchanger in which tubes having inner fins and outer fins are alternately laminated is well known, and is configured as shown in FIG. 1, for example. In addition, FIG. 1 which showed the whole laminated heat exchanger is used as a common figure for demonstrating the conventional structure and the structure which concerns on this invention. In the laminated heat exchanger 1 shown in FIG. 1, tubes 2 and outer fins 3 are alternately laminated to form a heat exchanger core 4, and an end plate 5 and a side tank 6 are joined to the outside thereof. Yes. The side tank 6 is formed with a flow path for introducing and discharging a fluid (for example, a refrigerant), and is further provided with a flange 7 for connecting an expansion valve (not shown).

  Conventionally, in the laminated heat exchanger 1 as described above, each tube 2 is configured as shown in FIGS. 15 and 16. That is, a pair of tube forming plates 8 having partitioning portions 16 extending in the longitudinal direction of the forming plate 8 are arranged to face each other and the peripheral edges are joined (for example, brazed), thereby forming fluid passages 9 and 10 therein. Yes. Inner fins 11 extending in the longitudinal direction of the tube forming plate 8 are inserted into the fluid passages 9 and 10 in order to improve heat exchange efficiency. As shown in FIG. 17, the inner fin 11 is formed by wave-shaped fluid flow path forming portions 12 and 13 and a connecting portion 14 that connects the fluid flow path forming portions 12 and 13. The passage forming portions 12 and 13 are arranged in the fluid passages 9 and 10. Thus, the conventional tube 2 is comprised (for example, patent document 1).

In the conventional tube 2 as described above, after the inner fins 11 are inserted between the tube forming plates 8 as described above (FIG. 15A), the tube forming plates 8 are temporarily assembled (for example, caulked). Further, the tube 2 is manufactured by brazing both the tube forming plate 8 and the inner fin 11 to each other (FIG. 15B).
JP-A-6-123581

  However, in the conventional tube 2, when the tube 2 is temporarily assembled, the connecting portion 14 of the inner fin 11 is not clamped by the partitioning portions 16 formed on the tube forming plates 8, and brazing is performed. A defect may occur, and a bypass flow path may be formed between the fluid passages 9 and 10 (FIG. 16). In order to prevent such inconvenience, it is necessary to strictly manage the tolerances of the height p of the connecting portion 14 and the dimension n of the inner fin 11 and the dimension m of the partitioning portion 16. For this reason, there exists a possibility of causing the fall of manufacturing efficiency and a cost increase.

  Accordingly, an object of the present invention is to improve the brazing property between the tube forming plate and the inner fin while preventing a decrease in manufacturing efficiency and an increase in cost, and a high-quality laminated heat that does not cause the formation of a bypass channel or the like. To provide an exchange.

  In order to solve the above-mentioned problems, a stacked heat exchanger according to the present invention forms a plurality of fluid passages inside by joining tube forming plates, and a fluid passage forming portion disposed in the fluid passages. And a laminated heat exchanger in which inner fins formed by connecting the fluid flow path forming portions to each other and inner fins inserted therein and outer fins are alternately laminated, The tube-forming plate is inclined with respect to the inner wall, and at least part of the tube-forming plate is formed as an inclined portion capable of contacting the inner wall. In such a configuration, the connecting portion of the inner fin is formed as an inclined portion that is inclined with respect to the inner wall of the tube forming plate, so compared to the case where the connecting portion is formed flat (conventional example), The connecting portion can be reliably brought into contact with the inner wall of the tube forming plate. In addition, the inclined portion as described above can be easily formed at the same time when the inner fin is formed by pressing or the like, so that the manufacturing cost can be greatly reduced.

  In order to solve the above problems, another stacked heat exchanger according to the present invention forms a plurality of fluid passages inside by joining tube forming plates, and is arranged in the fluid passages. In the stacked heat exchanger in which tubes having inner fins formed from fluid flow path forming portions and connecting portions that connect the fluid flow path forming portions to each other and outer fins are alternately stacked, The fin connecting portion is provided with a protrusion extending in the longitudinal direction of the tube forming plate and contacting the inner wall of the opposite tube forming plate. In such a configuration, since the connecting portion is provided with a protrusion that can contact the inner wall of the opposite tube forming plate, the connecting portion can be compared with the conventional example in which the connecting portion is formed flat. The inner wall of the tube forming plate can be reliably brought into contact. Further, since the protrusions as described above can be easily formed at the same time when the inner fin is formed by pressing or the like, the manufacturing cost can be greatly reduced.

  The protrusions are not particularly limited as long as they can contact the inner walls of the opposing tube forming plates. A plurality of protrusions may be arranged in the width direction of the connecting portion.

  Moreover, it is preferable that the height of the said protrusion is larger than the space | interval of the tube formation plate which opposes. If comprised in this way, a protrusion can be made to contact | abut reliably to the inner wall of a tube shaping | molding plate.

  The inner fin is not particularly limited. For example, the inner fin can be composed of a fluid flow path forming portion formed of a wave-shaped portion and a connecting portion for connecting the fluid flow path forming portion.

  The tube according to the present invention can be constituted by, for example, a pair of tube forming plates joined together, or a single tube forming plate bent and joined.

  In the laminated heat exchanger according to the present invention, the inner fin connecting portion and the inner wall of the tube forming plate can be reliably brought into contact with each other while preventing a reduction in manufacturing efficiency and an increase in cost. The brazing property between the connecting portion and the inner wall of the tube forming plate can be improved, and a high-quality laminated heat exchanger without the risk of forming a bypass flow path or the like can be realized.

Hereinafter, preferred embodiments of the laminated heat exchanger of the present invention will be described with reference to the drawings.
As described above, the main configuration of the stacked heat exchanger according to the present invention is substantially the same as the configuration shown in FIG. FIG. 2 is a plan view of the tube forming plate 8 used in the following embodiment.

FIG. 3 is an enlarged cross-sectional view of the inner fin 17 of the multilayer heat exchanger according to the first embodiment of the present invention. The inner fin 17 includes fluid flow path forming portions 18 and 19 and a connecting portion 20 that connects the fluid flow path forming portions 18 and 19. The fluid flow path forming parts 18 and 19 are formed from wave-like parts. Further, the connecting portion 20 is formed as an inclined portion capable of contacting the inner wall 21 of the opposing tube forming plate 8. Specifically, as shown in FIGS. 3 and 4, the dimension of the connecting part 20 that is inclined by an angle θ ₁ from the dimension A ₁ between the partition parts 16 formed on the inner wall 21 of the tube forming plate 8. E ₁ is formed larger. Therefore, in such a configuration, when the inner fins 17 are inserted into the pair of opposing tube forming plates 8 (FIG. 5A), at least both end portions 22 and 23 of the connecting portion 20 of the inner fins 17 16 (FIG. 5B). In this state, if the tube forming plate 8 is further pressurized from both sides, the connecting portion 20 is appropriately deformed (FIG. 5C), so that both end portions 22 and 23 of the connecting portion 20 are more reliably partitioned. It can be brought into contact with the portion 16. In addition, since the inclined portion as described above can be easily and simultaneously formed when the inner fin 17 is formed by pressing or the like, the manufacturing cost can be greatly reduced.

6 to 8 show the inner fin 24 of the stacked heat exchanger according to the second embodiment of the present invention. The inner fin 24 includes fluid flow path forming portions 25 and 26 and a connecting portion 27 that connects the fluid flow path forming portions 25 and 26. The fluid flow path forming portions 25 and 26 are formed from waved portions. Further, the connecting portion 27 is formed as an inclined portion that can contact the inner wall 21 of the opposing tube forming plate 8. Specifically, as shown in FIGS. 6 and 7, both ends of the connecting portion 27 inclined by an angle θ ₂ from the dimension A ₂ between the partition portions 16 formed on the inner wall 21 of the tube forming plate 8. The dimension E ₂ between the portions 28 and 29 is formed larger. Therefore, in such a configuration, when the inner fin 24 is inserted into the pair of opposed tube forming plates 8 (FIG. 8A), at least both end portions 28 and 29 of the connecting portion 27 of the inner fin 24 are separated from each other. 16 (FIG. 8B). In this state, if the tube forming plate 8 is further pressurized from both sides, the connecting portion 27 is appropriately deformed (FIG. 8C), so that both end portions 28 and 29 of the connecting portion 27 are more reliably partitioned. It can be brought into contact with the portion 16. In addition, the inclined portion as described above can be easily formed at the same time when the inner fin 24 is formed by pressing or the like, so that the manufacturing cost can be greatly reduced.

9 to 11 show the inner fin 30 of the stacked heat exchanger according to the third embodiment of the present invention. The inner fin 30 includes fluid flow path forming portions 31 and 32 and a connecting portion 33 that connects the fluid flow path forming portions 31 and 32. The fluid flow path forming parts 31 and 32 are formed from wave-like parts. Further, the connecting portion 33 is provided with a protrusion 34 that can come into contact with the inner wall 21 of the opposite tube forming plate 8. The protrusion 34 extends in the longitudinal direction of the tube forming plate 8. Specifically, as shown in FIGS. 9 and 10, the height of the protrusion 34 formed on the connecting portion 33 is larger than the dimension A ₃ between the partition portions 16 formed on the inner wall 21 of the tube forming plate 8. F ₁ is formed larger. Therefore, in such a configuration, when the inner fin 30 is inserted into the pair of opposed tube forming plates 8 (FIG. 11A), the protrusion 34 of the connecting portion 33 of the inner fin 30 contacts the partition portion 16. It contacts (FIG. 11 (b)). In this state, if the tube forming plate 8 is further pressurized from both sides, the protrusion 34 is appropriately deformed (FIG. 11 (c)), so that the protrusion 34 of the connecting portion 33 can be more reliably separated. It can be made to contact. Further, since the protrusions as described above can be easily formed at the same time when the inner fin 30 is formed by pressing or the like, the manufacturing cost can be greatly reduced.

12 to 14 show the inner fin 35 of the stacked heat exchanger according to the fourth embodiment of the present invention. The inner fin 35 includes fluid flow path forming parts 36 and 37 and a connecting part 38 that connects the fluid flow path forming parts 36 and 37. The fluid flow path forming parts 36 and 37 are formed of waved parts. Further, the connecting portion 38 is provided with a protrusion 39 that can come into contact with the inner wall 21 of the opposing tube forming plate 8. The protrusion 39 extends in the longitudinal direction of the tube forming plate 8. Specifically, as shown in FIGS. 12 and 13, the height of the protrusion 39 formed on the connecting portion 38 is larger than the dimension A ₄ between the partition portions 16 formed on the inner wall 21 of the tube forming plate 8. F ₂ is formed larger. Therefore, in such a configuration, when the inner fin 35 is inserted into the pair of opposed tube forming plates 8 (FIG. 14A), the protrusion 39 of the connecting portion 38 of the inner fin 35 contacts the partition portion 16. It contacts (FIG.14 (b)). In this state, when the tube forming plate 8 is further pressurized from both sides, the protrusion 39 is appropriately deformed (FIG. 14C), so that the protrusion 39 of the connecting portion 38 can be more reliably separated from the partition 16. It can be made to contact. Further, since the inclined portion as described above can be easily and simultaneously formed when the inner fin 35 is formed by pressing or the like, the manufacturing cost can be greatly reduced.

  In addition, in the said 3rd, 4th embodiment, although one protrusion is formed in the connection part, you may form multiple in the width direction of a tube formation plate.

  The present invention can be widely applied to stacked heat exchangers in which tubes and outer fins are alternately stacked, but can be applied particularly to stacked heat exchangers used in vehicle air conditioners.

It is a front view which shows the main structures of a laminated heat exchanger. It is a front view of the tube formation plate of FIG. It is a partial expanded side view of the inner fin inserted in the tube of the laminated heat exchanger which concerns on the 1st embodiment of this invention. It is a partial expanded sectional view of the tube of the laminated heat exchanger which concerns on the 1st embodiment of this invention. It is process drawing which shows the manufacturing process of the tube of FIG. It is a partial expanded side view of the inner fin inserted in the tube of the laminated heat exchanger which concerns on the 2nd embodiment of this invention. It is a partial expanded sectional view of the tube of the laminated heat exchanger which concerns on the 2nd embodiment of this invention. It is process drawing which shows the manufacturing process of the tube of FIG. It is a partial expanded side view of the inner fin inserted in the tube of the laminated heat exchanger which concerns on the 3rd embodiment of this invention. It is a partial expanded sectional view of the tube of the laminated heat exchanger which concerns on the 3rd embodiment of this invention. It is process drawing which shows the manufacturing process of the tube of FIG. It is a partial expanded side view of the inner fin inserted in the tube of the laminated heat exchanger which concerns on the 4th embodiment of this invention. It is a partial expanded sectional view of the tube of the laminated heat exchanger which concerns on the 4th embodiment of this invention. It is process drawing which shows the manufacturing process of the tube of FIG. It is process drawing which shows the manufacturing process of the tube of the conventional laminated heat exchanger. It is an enlarged view of the A section of FIG.15 (b). It is a front view of the inner fin inserted in the tube of the conventional laminated heat exchanger.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminate type heat exchanger 2 Tube 3 Outer fin 4 Heat exchanger core 5 End plate 6 Side tank 7 Flange 8 Tube forming plate 9, 10 Fluid passage 11, 17, 24, 30, 35 Inner fin 12, 13, 18, 19, 25, 26, 31, 32, 36, 37 Fluid flow path forming part 14, 20, 27, 33, 38 Connection part 16 Partition part 21 Inner wall 22, 23, 28, 29 End part 34, 39 Protrusion part

Claims (6)

  A tube forming plate is joined to form a plurality of fluid passages therein, and a fluid flow path forming portion disposed in the fluid passage and a connecting portion for connecting the fluid flow path forming portions to each other are formed. In a laminated heat exchanger in which tubes with inner fins inserted and outer fins are alternately laminated, the connecting portion of the inner fins is inclined with respect to the inner wall of the tube forming plate, and at least a part thereof abuts against the inner wall A laminated heat exchanger characterized in that it is formed as a possible inclined portion.   A tube forming plate is joined to form a plurality of fluid passages therein, and a fluid flow path forming portion disposed in the fluid passage and a connecting portion for connecting the fluid flow path forming portions to each other are formed. In a stacked heat exchanger in which tubes with inner fins inserted and outer fins are alternately stacked, the inner fins extend in the longitudinal direction of the tube forming plate and contact the inner walls of the opposite tube forming plates. A laminated heat exchanger characterized in that a protrusion is provided.   The stacked heat exchanger according to claim 2, wherein a plurality of the protrusions are formed in the width direction of the connecting portion.   The stacked heat exchanger according to claim 2 or 3, wherein the height of the protrusion is formed larger than the interval between the inner walls of the tube forming plates to be joined.   The laminated heat exchanger according to any one of claims 1 to 4, wherein the fluid flow path forming portion of the inner fin is a wave-shaped portion. The laminated heat exchanger according to any one of claims 1 to 5, wherein the tube is formed by joining a pair of tube forming plates to each other.

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