JP2009150587A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger for improving heat exchanging performance even when a tube having unevenness on its outer surface is applied. <P>SOLUTION: Bulging portions 424 formed on ridge parts 422a of curved portions 422 of a corrugated fin 42 are inserted into all of recessed portions 411 of the tube 41, and the tube 41 and the ridge parts 422a of the curved portions 422 of the corrugated fin 42 are brazed and joined to each other roughly over the whole region. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat exchanger in which fins are joined to the outer surface of a tube.

As a prior art, there is a heat exchanger disclosed in Patent Document 1 below. In this heat exchanger, the curved portion of the corrugated fin is brazed to the flat outer surface of the tube.
JP-A-5-106985

  However, in the heat exchanger of the above prior art, for example, when a tube having irregularities on the outer surface is adopted for the purpose of improving the tube strength or heat exchange performance, the heat exchanger in which fins are joined to the flat surface of the tube As compared with the above, there is a problem that the area of bonding between the tube and the fin is reduced, the heat conduction performance between the tube and the fin is lowered, and the heat exchange performance of the heat exchanger is lowered.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a heat exchanger that can improve heat exchange performance even when a tube having an uneven surface is adopted. And

  In order to achieve the above object, according to the first aspect of the present invention, a heat exchanger comprising a tube (41) through which an internal fluid flows and a fin (42) joined to the outer surface of the tube (41). And the uneven | corrugated shape which has a recessed part (411) is formed in the outer surface of a tube (41), and it protrudes in the position corresponding to the recessed part (411) of a tube (41) in a fin (42). (424) is formed, and the protrusion (424) is inserted into the recess (411) and joined to each other.

  According to this, even if the outer surface of the tube (41) is uneven, the protrusion (424) formed on the fin (42) is inserted into the recess (411) of the tube (41) and joined together. ing. Therefore, it is easy to secure the joint area between the tube (41) and the fin (42), and even when the tube (41) having an uneven surface is adopted, the heat exchange performance is improved. Can do.

  In the invention according to claim 2, the tube (41) is characterized in that the recess (411) continuously extends linearly in the extending direction of the tube (41).

  According to this, even when a plurality of joint portions between the tubes (41) and the fins (42) are provided in the extending direction of the tubes (41), the protrusions (424) forming positions on the fins (42) are joined. It is not necessary to change every place and can be made the same.

  In the invention according to claim 3, the fin (42) includes a plurality of plane portions (421) substantially parallel to the flow direction of the external fluid flowing outside the tube (41), and adjacent plane portions (421). And a curved portion (422) that connects the two, and a protruding portion (424) is formed on a ridge line portion (422a) of the curved portion (422).

  According to this, the fin (42) is a corrugated fin (42) formed into a wave shape so as to have a curved portion (422) connecting between a plurality of flat portions (421) and adjacent flat portions (421), A protruding portion (424) can be formed on the ridge line portion (422a) of the curved portion (422) to ensure a bonding area between the tube (41) and the fin (42).

  Moreover, like the invention of Claim 4, the protrusion part (424) can be made into the bulging part (424) which bulged outward.

  Further, as in the invention described in claim 5, the protruding portion (426) can be a cut-and-raised portion (426) cut and raised outward.

  Further, in the invention described in claim 6, the one curved portion (422) of the fin (42) is all formed at a portion where one curved portion (422) is joined on the outer surface of the tube (41). A protrusion (424) is formed at a position corresponding to the recess (411).

  According to this, the protrusions (424) are inserted and joined in all the recesses (411), and the joining area between the tubes (41) and the fins (42) can be ensured reliably.

  In the invention according to claim 7, a plurality of the curved portions (422) of the fin (42) formed at a portion where one curved portion (422) is joined on the outer surface of the tube (41). The protrusions (424) are formed at positions corresponding to some of the recesses (411) of the recesses (411).

  According to this, since it is not necessary to form the protrusions (424) corresponding to all the recesses (411), it is relatively easy to form the fin (42) having the protrusions (424).

  In the invention according to claim 8, the protrusion (424) of the fin (42) has a height (H1) substantially the same as the depth (D) of the recess (411) of the tube (41). It is characterized by being.

  According to this, it is possible to join the recess (411) of the tube (41) and the protrusion (424) of the fin (42) relatively easily.

  In the invention according to claim 9, the protrusion (425) of the fin (42) has a height (H2) smaller than the depth (D) of the recess (411) of the tube (41). Yes.

  According to this, since it is not necessary to largely deform the fin (42) when the protrusion (425) is provided, it is relatively easy to mold the fin (42) having the protrusion (425).

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a condenser (condenser) 1 that is a heat exchanger according to the first embodiment to which the present invention is applied. FIG. 2 is a diagram illustrating a core part (heat exchange part) 40 of the condenser 1. It is the II-II sectional view taken on the line of FIG. 1 which shows the cross-section of a part. 3 is a perspective view of a corrugated fin 42 that is one of the components of the core portion 40, and FIG. 4 is a sectional view taken along line IV-IV in FIG.

  As shown in FIG. 1, the capacitor 1 includes a core portion 40, header tanks 20 and 30, an attachment portion (not shown), and the like. Each member is made of an aluminum alloy material, and is assembled by fitting, caulking, jig fixing, or the like. And are integrally brazed and joined (thermally joined) with a brazing material previously provided on the surface of each member.

  A pair of header tanks arranged at a predetermined interval, that is, header tanks 20 and 30 are substantially cylindrical shapes extending in the vertical direction, and both end portions have a bottomed shape. And the core part 40 for heat exchange is arrange | positioned between the header tanks 20 and 30. FIG.

  The capacitor 1 of the present embodiment is generally called a multi-flow type, and the core portion 40 has the same shape in which a refrigerant that is an internal fluid flows in the horizontal direction between the left and right header tanks 20 and 30. A plurality of tubes (heat transfer tubes) 41 are stacked at equal intervals in the vertical direction, and corrugated fins (corresponding to fins) 42 are joined between the many tubes 41. Further, a side plate 43 as a strength member is joined to the outer side of the upper and lower outermost corrugated fins 42.

  One end of the tube 41 communicates with the right header tank 20, and the other end communicates with the left header tank 30. An inlet joint 24 through which refrigerant flows into the upper end side of the header tank 20 and an outlet joint 25 through which refrigerant flows out are arranged and joined to the lower end side.

  On the other hand, a separator (not shown) which is a partition plate is disposed on the lower side in the header tank 20. Thereby, the inside of the header tank 20 is partitioned into an upper space and a lower space. The inlet joint 24 communicates with the upper space in the header tank 20, and the outlet joint 25 communicates with the lower space in the header tank 20.

  As shown in FIG. 2, the tube 41 is formed of a thin plate material having projections and depressions, and the inside of a portion that is a projection 412 on the outer surface is a passage for a refrigerant that is an internal fluid. In the tube 41 of the present embodiment, a plurality of refrigerant passages (six in this example) are provided, and the tube 41 extends in the extending direction (longitudinal direction) between the plurality of convex portions 412 on the outer surface of the tube 41. The concave portion 411 is formed so as to extend continuously in a straight line in the direction (front and back direction in the figure).

  As shown in FIG. 3, the corrugated fins 42 are wavy so as to have a plurality of flat portions 421 that are substantially parallel to the flow direction of the air that is the external fluid and curved portions 422 that connect the adjacent flat portions 421. It is molded into. A louver 423 is formed on the flat portion 421. As shown in FIG. 4, the ridge line portion 422a of the curved portion 422 has a plurality of bulged portions (corresponding to projecting portions) 424 plastically deformed so as to bulge outward in a substantially spherical shape. Is formed.

  The bulging portion 424 is formed at a position corresponding to all of the plurality of concave portions 411 of the tube 41. That is, in the ridge line portion 422a of one curved portion 422 of the corrugated fin 42, the bulging portion 424 is located at a position corresponding to all the concave portions 411 formed on the outer surface of the tube 41 where the one curved portion 422 is joined. Is formed.

  In addition, the height H1 shown in FIG. 4 of the bulging portion 424 is substantially the same as the depth D of the concave portion 411 of the tube 41 shown in FIG. 2 (the dimension from the top of the convex portion 412 to the bottom of the concave portion 411). It has become. Here, the height H1 of the bulging portion 424 is substantially the same as the depth D of the concave portion 411, not only when the height H1 and the depth D are exactly the same, but also in the concave portion 411. This includes the case where the height H1 is smaller than the depth D so that the brazing material is completely filled in the gap formed when the 424 is inserted and brazed.

  As shown in FIG. 2, the bulging portions 424 of the corrugated fins 42 are inserted into the respective concave portions 411 of the tubes 41 so that the convex portions 412 on the left end of the tubes 41 protrude from the convex portions 412 on the right side of the drawings. The tube 41 and the curved portion 422 ridge line portion 422a of the corrugated fin 42 are joined to each other by a brazing material (joining material) 45 in the entire region up to the portion 412 (the entire joining region shown in FIG. 2).

  According to the above-described configuration, although the outer surface of the tube 41 has irregularities, the bulging portions 424 formed on the ridge line portions 422a of the curved portions 422 of the corrugated fins 42 are inserted into all the concave portions 411 of the tubes 41 and are mutually connected. It is joined to. As a result, the tube 41 and the ridge line portion 422a of the corrugated fin 42 curved portion 422 are brazed to each other over almost the entire area, and a sufficient bonding area between the tube 41 and the corrugated fin 42 is ensured. In this way, even when the tube 41 having an uneven outer surface is adopted, the heat conduction performance can be improved and the heat exchange performance between the internal fluid and the external fluid in the core portion 40 can be improved. Moreover, the vibration resistance etc. of the core part 40 can also be improved.

  In addition, since the height H1 of the bulging portion 424 of the corrugated fin 42 is substantially the same as the depth D of the concave portion 411 of the tube 41, the height between the concave portion 411 of the tube 41 and the bulging portion 424 of the corrugated fin 42 is It is possible to relatively easily braze the gap.

  Moreover, since the recessed part 411 of the tube 41 is continuously extended linearly in the extending direction of the tube 41, the bulging part 424 may be provided at the same position in the plurality of curved parts 422 of the corrugated fins 42. The corrugated fin 42 having the bulging portion 424 can be easily formed.

(Second Embodiment)
Next, a second embodiment will be described based on FIG.

  The second embodiment is different from the first embodiment in that the height of the bulging portion is lowered. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 5, in the present embodiment, the bulging portion 425 is formed at a position corresponding to all of the plurality of concave portions 411 of the tube 41. Further, the bulging portion 425 is set such that the height H <b> 2 is lower than the depth D of the concave portion 411 of the tube 41.

  And the bulging part 425 of the corrugated fin 42 is inserted in each recessed part 411 of the tube 41, and the curved part 422 ridgeline part 422a of the tube 41 and the corrugated fin 42 mutually connects with the brazing material (joining material) 45. It is joined.

  Between the recessed part 411 of the tube 41 and the bulging part 425 of the corrugated fin 42, the distance between the inlet side edge part of the recessed part 411 and the proximal end side edge part of the bulging part 425 is relatively small, and the brazing material 45 fillets are reliably formed.

  According to such a configuration, it is possible to secure a larger bonding area between the tube 41 and the corrugated fin 42 than when the bulged portion is not provided in the ridge line portion 422a of the curved portion 422 of the corrugated fin 42. Therefore, even when the tube 41 having an uneven outer surface is adopted, the heat conduction performance can be improved and the heat exchange performance between the internal fluid and the external fluid in the core portion 40 can be improved. The vibration resistance of 40 can also be improved.

  The inventor has confirmed that good heat exchange performance can be ensured if approximately 80% or more of the ridge line portion 422a of the curved portion 422 of the corrugated fin 42 is joined to the tube 41.

  Furthermore, since the height H2 of the bulging portion 425 of the corrugated fin 42 can be reduced to suppress the amount of plastic deformation of the corrugated fin 42 when the bulging portion 425 is provided, the corrugated fin 42 having the bulging portion 425 can be formed. Is easy.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG.

  The third embodiment is different from the first embodiment described above in that the number of bulging portions is reduced. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 6, in this embodiment, the bulging part 424 provided in the ridgeline part 422a of the curved part 422 of the corrugated fin 42 is made smaller than the number of the recessed parts 411 of the tube 41 shown in FIG. In other words, the ridge line portion 422a of one curved portion 422 of the corrugated fin 42 is a part of the plurality of concave portions 411 formed at the portion where one curved portion 422 is joined on the outer surface of the tube 41 (in this example, 5 A bulging portion 424 is formed at a position corresponding to three of the concave portions 411.

  According to such a configuration, it is possible to secure a larger bonding area between the tube 41 and the corrugated fin 42 than when the bulged portion is not provided in the ridge line portion 422a of the curved portion 422 of the corrugated fin 42. Therefore, even when the tube 41 having an uneven outer surface is adopted, the heat conduction performance can be improved and the heat exchange performance between the internal fluid and the external fluid in the core portion 40 can be improved. The vibration resistance of 40 can also be improved.

  Furthermore, since it is not necessary to form the bulging portion 424 corresponding to all the concave portions 411, the corrugated fin 42 having the bulging portion 424 can be formed relatively easily.

(Fourth embodiment)
Next, a fourth embodiment will be described based on FIG. 7 and FIG.

  The fourth embodiment is different from the first embodiment in that the protruding portion is cut and raised. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 7 is a perspective view of the corrugated fin, and FIG. 8 is a cross-sectional view of the principal part in the direction of the ridge line of the curved portion. The ridge line portion 422a of the curved portion 422 of the corrugated fin 42 is cut and raised outward. A plurality of cut-and-raised portions (corresponding to protruding portions) 426 are formed.

  The cut-and-raised portions 426 are formed by being cut and raised in a rectangular shape so as to be opposed to each other at a position corresponding to all of the plurality of concave portions 411 of the tube 41 shown in FIG. In other words, the ridge line portion 422a of one curved portion 422 of the corrugated fin 42 is cut and raised at positions corresponding to all the concave portions 411 formed at the portion where one curved portion 422 is joined on the outer surface of the tube 41. Is formed. Further, the height of the cut-and-raised portion 426 is substantially the same as the depth of the concave portion 411 of the tube 41.

  According to such a configuration, although the outer surface of the tube 41 is uneven, the cut-and-raised portion 426 formed in the ridge line portion 422a of the curved portion 422 of the corrugated fin 42 is inserted into all the concave portions 411 of the tube 41. They are joined together. As a result, the tube 41 and the ridge line portion 422a of the corrugated fin 42 curved portion 422 are brazed to each other over almost the entire area, and a sufficient bonding area between the tube 41 and the corrugated fin 42 is ensured. In this way, even when the tube 41 having an uneven outer surface is adopted, the heat conduction performance can be improved and the heat exchange performance between the internal fluid and the external fluid in the core portion 40 can be improved. Moreover, the vibration resistance etc. of the core part 40 can also be improved.

  Moreover, since the protrusion part corresponding to the recessed part 411 of the tube 41 is made into the raising part 426, it is easy to ensure height compared with the bulging part 424 of 1st Embodiment, and the raising part 426 is made. It is relatively easy to form the corrugated fin 41 having

(Other embodiments)
In the fourth embodiment, the cut and raised portions 426 are provided corresponding to all the concave portions 411 of the tube 41, and the height of the cut and raised portions 426 is substantially the same as the depth of the concave portions 411. 426 may be provided corresponding to a part of the recesses 411, or the height of the cut-and-raised portion may be set lower than the depth of the recesses 411.

  Further, the shape of the cut-and-raised portion is not limited to the shape of the cut-and-raised portion 426 of the fourth embodiment. For example, the cut-and-raised portion 427 showing a cross section in the ridge line direction in FIG. Like the cut-and-raised part 428 showing the cross-section in the ridge line direction, the ridge line part 422a of the curved part 422 of the corrugated fin 42 is cut up with the one end side in the ridge line direction as a fulcrum and the other end side outward. Also good.

  Further, for example, like the cut-and-raised portion 429 shown in a perspective view in FIG. 11, the other end side is cut outward with the one end side in the direction in which the corrugated shape of the corrugated fin 41 extends as a fulcrum. Also good.

  Moreover, in each said embodiment, although the fin joined to the outer surface of the tube 41 was a corrugated fin, fin shape is not limited to this. For example, as shown in FIG. 12, the fins are flat plate fins 42A, and all or a part of the positions corresponding to the concave portions of the tubes of the tube insertion holes of the plate fins 42A have substantially the same height as the depth of the concave portions. Alternatively, the protrusion 424A lower than the depth of the recess may be formed.

  Moreover, in each said embodiment, although the recessed part 411 of the tube 41 was extended continuously linearly in the extension direction of the tube 41, you may make a recessed part extend | stretch discontinuously or other than linear form.

  Moreover, although each said embodiment demonstrated the example which applied this invention to the capacitor | condenser 1, a heat exchanger is not limited to a capacitor | condenser. For example, you may apply to a gas cooler, an evaporator, a radiator, an intercooler, an oil cooler etc.

  Moreover, in each said embodiment, although the tube and the fin were brazed and joined mutually, the joining method is not limited to this, For example, you may join by welding or adhesion | attachment. Further, the material of the heat exchanger is not limited to the aluminum alloy, and other metals or resins having good thermal conductivity may be used.

It is a schematic block diagram of the capacitor | condenser 1 which is a heat exchanger in 1st Embodiment to which this invention is applied. It is the II-II sectional view taken on the line of FIG. It is a perspective view of the corrugated fin 42 in 1st Embodiment. It is the IV-IV sectional view taken on the line of FIG. It is principal part sectional drawing of the capacitor | condenser 1 in 2nd Embodiment. It is a perspective view of a corrugated fin in a 3rd embodiment. It is a perspective view of a corrugated fin in a 4th embodiment. It is principal part sectional drawing of the corrugated fin in 4th Embodiment. It is principal part sectional drawing of the corrugated fin in other embodiment. It is principal part sectional drawing of the corrugated fin in other embodiment. It is a perspective view of a corrugated fin in other embodiments. It is a principal part top view of the plate fin in other embodiment.

Explanation of symbols

1 Capacitor (heat exchanger)
41 Tube 42 Corrugated fin (fin)
42A Plate fin (fin)
45 Brazing material 411 Concave part 422 Curved part 422a Ridge part 424, 425 Swelling part (protrusion part)
424A Protruding part 426, 427, 428, 429 Cut and raised part (protruding part)
D Depth of recess H1, H2 Height of bulge

Claims (9)

A heat exchanger comprising a tube (41) through which an internal fluid flows and a fin (42) joined to the outer surface of the tube (41),
An uneven shape having a recess (411) is formed on the outer surface of the tube (41),
The fin (42) has a protrusion (424) formed at a position corresponding to the recess (411) of the tube (41).
The heat exchanger, wherein the protrusion (424) is inserted into the recess (411) and joined to each other.   The heat exchanger according to claim 1, wherein the recess (411) extends linearly in the tube (41) in the extending direction of the tube (41). The fin (42) includes a plurality of flat portions (421) substantially parallel to the flow direction of the external fluid flowing outside the tube (41) and a curved portion (422) connecting between the adjacent flat portions (421). )
The heat exchanger according to claim 1 or 2, wherein the protruding portion (424) is formed on a ridge line portion (422a) of the curved portion (422).   The heat exchanger according to claim 3, wherein the protrusion (424) is a bulging portion (424) bulging outward.   The heat exchanger according to claim 3, wherein the protrusion (426) is a cut-and-raised part (426) cut and raised outward.   One of the curved portions (422) protrudes at a position corresponding to all the concave portions (411) formed at a portion where the one curved portion (422) is joined on the outer surface of the tube (41). The heat exchanger according to any one of claims 3 to 5, wherein a portion (424) is formed.   In one of the curved portions (422), some of the concave portions (411) of the plurality of concave portions (411) formed at a portion where the one curved portion (422) is joined on the outer surface of the tube (41). The heat exchanger according to any one of claims 3 to 5, wherein the protrusion (424) is formed at a position corresponding to (411).   The protrusion (424) has a height (H1) substantially the same as a depth (D) of the recess (411), according to any one of claims 3 to 7. Heat exchanger.   The heat exchanger according to any one of claims 3 to 7, wherein the protrusion (425) has a height (H2) smaller than a depth (D) of the recess (411).

Images