JP2005221155A - Tube for constituting heat exchanger and heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent shifting of an inner fin in assembling. <P>SOLUTION: A recessed part 22a for a refrigerant passage is formed on only one 22 of tube sheets joined to each other, and the depth b thereof is set substantially equal to the height h of the inner fin 3. Two recessed parts 22a are formed, and a projecting rib 22c is secured between the recessed parts 22a to secure a flange 22b having the same height as the top face of the projecting rib 22c in the periphery of the recessed part. The other tube sheet 12 is formed U-shaped in section so that both ends in the width direction of a flat plate are provided with a projecting piece 12a toward one tube sheet 22 side. The inner fin 3 is accommodated in each recessed part 22a of one tube sheet 22, and with the outside of the flange 22b covered with the projecting piece 12a, both tube sheets 12, 22 are joined to each other to constitute a tube 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tube for constituting a heat exchanger and a heat exchanger using the tube.

  Among heat exchangers, there is a tube-stacked heat exchanger in which a pair of tube sheets (metal thin plates) are combined in the middle to form a tube, and a large number of the tubes are stacked (for example, patents) Reference 1).

  FIG. 2 is a perspective view of a heat exchanger used as an evaporator of an air conditioner as an example. This heat exchanger is formed by laminating and joining a large number of flat container-like tubes 1, and each tube 1 has two tube sheets 2 in the state of sandwiching inner fins 3 as shown in FIG. It is joined together.

  The tube sheet 2 has a semi-container shape in which a long plate is shallowly recessed by pressing except for the outer peripheral flange 2b and the central convex rib 2c, and is used for forming two refrigerant passages parallel to each other along the longitudinal direction. It has a recess 2a. Further, deeper circular recesses 2d are formed at both longitudinal ends of the recesses 2a, and the bottoms of the recesses 2d are punched into a circle. The recessed portion 2d may be closed as a partition portion of the tank of the heat exchanger without being punched out.

  When a pair of tube sheets 2 having such a structure are prepared and joined together in the middle, the inner space becomes a flat sealed container-like tube 1 divided into left and right by the convex rib 2c, and the recessed portion 2d of the tube sheet 2 is formed. Is a cylindrical tank portion protruding from both side surfaces of the tube 1 (hereinafter, described by the same reference numeral 2d as the recessed portion). In addition, the inner space defined in two by the convex rib 2c becomes two refrigerant passages (hereinafter, described by the same reference numeral 2a as the concave portion) communicating with the tank portion.

And each tube 1 is butted and joined at the projecting end of the opposing tank portion 2d, so that the tanks 4 and 4 that are adjacent in the front-rear position and extend in parallel in the left-right direction are at the upper and lower ends (left and right ends in FIG. 2). Each of the tube stacked heat exchangers is configured. In addition, an air flow passage is secured between the adjacent tubes 1, and outer fins 5 having a corrugated cross section are disposed here.
JP 2000-105093 A

  By the way, conventionally, by setting the depth a of the concave portion 2a of each tube sheet 2 to approximately ½ of the height h of the inner fin 3, the inner fin 3 can be accommodated when the two concave portions 2a are combined. I was doing.

  When the tube 1 is assembled, the inner fins 3 are accommodated in the recesses 2a of one tube sheet 2 and then overlapped so that the other tube sheet 2 is covered. If the inner fin 3 can only be accommodated in the recess 2a of the tube sheet 2, the inner fin 3 is likely to be displaced depending on how the inner fin 3 is supplied. Further, even if the inner fin 3 is housed in the recess 2a of one tube sheet 2, half of the inner fin 3 protrudes from the tube sheet 2, so that when the other tube sheet 2 is overlapped, the inner fin 3 There was a possibility that the position of 3 would be shifted.

  In view of the above circumstances, an object of the present invention is to provide a heat exchanger configuration tube that can more reliably prevent displacement of the inner fin during assembly, and a heat exchanger using the tube. .

According to the first aspect of the present invention, a pair of tube sheets are joined together in the middle while a strip-like inner fin is accommodated with a corrugated cross section, whereby a plurality of tube sheets extending in the longitudinal direction in parallel with the inside are joined. A heat exchanger tube having a refrigerant passage,
Only one of the pair of tube sheets is formed with a plurality of recesses for forming the refrigerant passage having a depth substantially equal to the height of the inner fins of the corrugated cross section, and the recesses are formed between the recesses. A convex rib for partitioning is secured, a flange having the same height as the top surface of the convex rib is secured around the concave portion, and the other tube sheet of the pair of tube sheets is placed at both ends of the flat plate in the width direction. The two tubes are formed in a U-shaped cross-section with a projecting piece toward the tube sheet side, an inner fin is accommodated in each recess of the one tube sheet, and the outside of the flange is covered by the projecting piece. The sheet is formed by joining the sheets together.

The invention of claim 2 includes a tube having an internal refrigerant passage and having a cylindrical tank portion projecting from both longitudinal ends of the refrigerant passage, and a plurality of the tubes are laminated in a plurality of stages. A heat exchanger that communicates the tank portions of the tubes adjacent to each other and secures an air passage between the tubes,
The tube is formed by joining a pair of tube sheets provided with a recess for forming a refrigerant passage on at least one of the surfaces facing each other in a state of accommodating a strip-shaped inner fin with a corrugated cross section in the recess. , Thereby forming a plurality of refrigerant passages extending in the longitudinal direction in parallel with the inside,
Only one of the pair of tube sheets is formed with a plurality of recesses for forming the refrigerant passage having a depth substantially equal to the height of the inner fins of the corrugated cross section, and the recesses are formed between the recesses. A convex rib for partitioning is secured, a flange having the same height as the top surface of the convex rib is secured around the concave portion, and the other tube sheet of the pair of tube sheets is placed at both ends of the flat plate in the width direction. The two tubes are formed in a U-shaped cross-section with a projecting piece toward the tube sheet side, an inner fin is accommodated in each recess of the one tube sheet, and the outside of the flange is covered by the projecting piece. The sheet is formed by joining the sheets together.

  According to the invention of claim 1, since the depth of the recess for forming the refrigerant passage of one of the tube sheets joined together in the middle is set to be substantially the same as the height of the inner fin, Inner fins can be completely inserted into the recesses of the tube sheet, and in this state, the tube sheets can be joined together without worrying about displacement of the inner fins. Further, although the other tube sheet has a flat plate shape as a whole, it is formed in a U-shaped cross section having projecting pieces at both ends in the width direction, so that sufficient rigidity can be secured. In addition, since both end portions and the intermediate portion in the width direction of the flat plate portion overlap with the top surfaces of the flanges and convex ribs of the mating tube sheet at the stage after joining, one tube sheet is a simple flat plate. Despite being, there is no risk of insufficient strength.

  According to the invention of claim 2, since the tube of the invention of claim 1 is laminated, it is possible to maintain a good quality without positional deviation of the inner fin while maintaining a predetermined rigidity.

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

  1A and 1B are views showing a state before the assembly of the tube of the embodiment, in which FIG. 1A is a perspective view, and FIG. 1B is a cross-sectional view taken along the arrow Ib-Ib in FIG.

  The tube 20 for constituting the heat exchanger is of a flat container type, and a pair of tube sheets 21 and 22 obtained by press-molding a metal thin plate is provided with a recess 22a for forming a refrigerant passage provided on one mating surface. In the state in which the strip-shaped inner fins 3 are accommodated in a cross-sectional waveform, the inner fins 3 are joined together in the middle and have a plurality of refrigerant passages extending in the longitudinal direction in parallel with the inside. .

  The recess 22a for forming the refrigerant is formed only in one of the tube sheets 22, and the depth b of the recess 22a is set to a dimension (h≈b) that is substantially equal to the height h of the inner fin 3 in the corrugated cross section. ing. Two (or two or more) recesses 22a are formed in parallel to each other, and a convex rib 22c that partitions the recess 22a is secured between the recesses 22a, and the top surface of the convex rib 22c is provided around the recess 22a. The flange 22b having the same height as that of the first and second heights is secured.

  The other tube sheet 21 is formed in a U-shaped cross section having protrusions 21a bent toward the one tube sheet 22 at both ends in the width direction of the flat plate.

  Moreover, the recessed part 2d which comprises a cylindrical tank part is formed in the longitudinal direction both ends of both the tube sheets 21 and 22 similarly to the past. In addition, it is sufficient if the protruding piece 21a of the other tube sheet 21 extends to the vicinity of the recessed portion 2d (tank portion).

  Then, with the tube sheet 22 having the recess 22a facing down, the inner fins 3 are accommodated in the two recesses 22a, respectively, and the other tube sheet 21 is covered thereon, and the projecting piece 21a covers the flange 22b. Cover the outside. In this state, the tube 20 is configured by joining the tube sheets 21 and 22 together in the middle.

  As described above, the tube 20 for constituting the heat exchanger according to the present embodiment has the depth b of the recess 22a for the refrigerant passage of one of the tube sheets 22 joined together in the middle, and the height h of the inner fin 3. Since the inner fins 3 can be completely inserted into the recesses 22a of the tube sheet 22 during assembly, the other tube sheet 21 is placed on the tube sheet 22 in this state. As a result, the tube sheets 21 and 22 can be joined to each other without worrying about displacement of the inner fins 3.

  Moreover, although the tube sheet 21 piled up from the top has a flat plate shape as a whole, the tube sheet 21 has a U-shaped cross section in which protruding pieces 21a are formed at both ends in the width direction, and thus can have sufficient rigidity. In addition, since both end portions and the intermediate portion in the width direction of the flat plate portion overlap the top surfaces of the flanges 22b and the convex ribs 22c of the opposite tube sheet 22 after joining, one tube sheet 21 has a simple flat plate shape. In spite of being a thing, there is no possibility of causing insufficient strength after the tube 20 is completed.

  Moreover, an air passage was ensured between the tubes 20 by stacking a large number of the tubes 20 for the heat exchanger structure having such a structure in a state where the cylindrical tank portions (concave portions 2d) are connected in communication. A tube-laminated heat exchanger can be obtained. Moreover, since the heat exchanger uses the tube 20, it is possible to maintain a good quality with no displacement of the inner fin 3 while maintaining a predetermined rigidity.

It is a figure which shows the state before the assembly of the tube of embodiment of this invention, (a) is a perspective view, (b) is Ib-Ib arrow sectional drawing of (a). It is a perspective view which shows the external appearance structure of the conventional heat exchanger. It is a figure which shows the state before the assembly of the conventional tube, (a) is a perspective view, (b) is IIIb-IIIb arrow sectional drawing of (a).

Explanation of symbols

2d ... Tank part 3 Inner fin 20 Tube 21 Tube sheet 21a Projection piece 22 Tube sheet 22a Concave part 22b Flange 22c Convex rib

Claims (2)

A pair of tube sheets (21, 22) are joined together in the middle with the strip-shaped inner fins (3) accommodated in a corrugated cross section, and thereby a plurality of tubes extending in the longitudinal direction in parallel with the inside. A heat exchanger configuration tube (20) having a refrigerant passage of
The refrigerant passage having a depth (b) substantially equal to the height (h) of the inner fin (3) of the corrugated cross section only in one tube sheet (22) of the pair of tube sheets (21, 22). A plurality of forming concave portions (22a) are formed, and a convex rib (22c) for partitioning the concave portion (22a) is secured between the concave portions (22a), and the convex rib (22c) is provided around the concave portion (22a). ) To secure the flange (22b) of the same height as the top surface of
The other tube sheet (21) of the pair of tube sheets (21, 22) has a U-shaped cross section having protrusions (21a) toward the one tube sheet (22) at both ends in the width direction of the flat plate. Formed into
The inner fins (3) are accommodated in the recesses (22a) of the one tube sheet (22), and both the tube sheets (21) are covered with the protrusions (21a) covering the outside of the flange (22b). , 22) are joined together during the tube (20) for constituting a heat exchanger. A tube (20) having an internal refrigerant passage and having a cylindrical tank portion (2d) projecting from both longitudinal ends of the refrigerant passage is provided, and the tubes (20) are stacked in a plurality of stages. A heat exchanger in which the tank portions (2d) of the tubes (20) adjacent in the stacking direction are communicated with each other and an air passage is secured between the tubes (20),
In the tube (20), a pair of tube sheets (21, 22) are joined together in the state of accommodating a strip-shaped inner fin (3) with a corrugated cross-section, thereby being parallel to the inside. A plurality of refrigerant passages extending in the longitudinal direction.
The refrigerant passage having a depth (b) substantially equal to the height (h) of the inner fin (3) of the corrugated cross section only in one tube sheet (22) of the pair of tube sheets (21, 22). A plurality of forming concave portions (22a) are formed, and a convex rib (22c) for partitioning the concave portion (22a) is secured between the concave portions (22a), and the convex rib (22c) is provided around the concave portion (22a). ) To secure the flange (22b) of the same height as the top surface of
The other tube sheet (21) of the pair of tube sheets (21, 22) is a U-shaped cross section having protrusions (21a) toward the one tube sheet (22) at both ends in the width direction of the flat plate. Formed into
The inner fins (3) are accommodated in the recesses (22a) of the one tube sheet (22), and both the tube sheets (21) are covered with the protrusions (21a) covering the outside of the flange (22b). , 22) are joined together during the heat exchanger.

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