JP2008064401A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger without reducing thickness of a base plate and a tank for ensuring compressive strength and allowing stable caulking work. <P>SOLUTION: In the heat exchanger, a header tank 5 constructed of the tank 4, which is fixed by bending and caulking a caulking claw 3 formed in the base plate 2, is provided to the base plate 2, to which tube end parts are inserted and fixed for arranging a plurality of tubes at predetermined intervals. In this heat exchanger, a first projection part 9 serving as a receiver of the tank 4 is arranged in the base end part to which the caulking claw 3 is formed, while a second projection part 14, which is brought into contact with the first projection part 9 during caulking work, is arranged in the tank 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger, for example, and more particularly to a caulking structure of a header tank.

  The heat exchanger includes a core portion formed by alternately stacking a long tube through which a refrigerant flows and a cooling fin that exchanges heat with the wind that hits the refrigerant flowing in the tube. It consists of header tanks provided at both ends.

  The header tank is composed of a seat plate in which a plurality of insertion holes for inserting tube ends are formed, and a tank assembled to the seat plate. The seat plate and the tank are fixed by bending caulking claws. (See, for example, Patent Documents 1 and 2).

  In FIGS. 6 and 7, the caulking claw 102 formed on the seat plate 101 having a substantially U-shaped cross-section with the tube 100 inserted and fixed is bent and caulked into a tank 103 having a substantially inverted W-shaped cross-section. An example of the configured header tank 104 is shown.

  At the base end portion of the caulking claw 102, a convex portion 105 for receiving a load applied to the tank 103 when the caulking claw 102 is caulked is provided. The convex portion 105 is formed by projecting the seat plate 101 with a jig or the like into the header tank from the outside to the inside. As shown in FIG. 7, the height A of the convex portion 105 is the same as the protruding amount C of the tube 100 protruding into the header tank 104.

By providing the convex portions 105, the front end surfaces 106a of the tank side walls 106 are supported by the convex portions 105, so that the load when the caulking claws 102 are caulked can be reduced.
JP-A-2005-55037 JP 2003-156296 A

  However, if the height A of the convex portion 105 is made the same as the protruding amount C of the tube 100, the height of the convex portion 105 is increased. Therefore, as shown in FIG. The area surrounded by the middle circle becomes thinner, and the pressure resistance decreases.

  In particular, in the case of a heat exchanger having a high pressure specification, such as a CO2 air conditioner using CO2 gas (carbon dioxide gas) as a refrigerant, there is a problem of strength reduction due to a reduction in the thickness of the seat plate 101.

  Then, an object of this invention is to provide the heat exchanger which can ensure the pressure-resistant intensity | strength without making a seat plate and a tank thin, and can perform the crimping process of a crimping claw stably.

  According to the first aspect of the present invention, the tank is fixed by bending and crimping a caulking claw formed on the seat plate on which a tube end portion is inserted and fixed to arrange a plurality of tubes at a predetermined interval. In the heat exchanger provided with the header tank, a second convex portion that is provided with a first convex portion that serves as a receiver of the tank at the base end portion on which the caulking claw is formed, and that contacts the first convex portion during caulking Is provided in the tank.

  The invention according to claim 2 is the heat exchanger according to claim 1, wherein the height of the first convex portion is made lower than the protruding amount of the tube protruding into the header tank. Features.

  Invention of Claim 3 is a heat exchanger of Claim 1 or Claim 2, Comprising: The sum total of the height of the said 1st convex part and the said 2nd convex part protrudes in the said header tank. The protruding amount of the tube is the same.

  According to the first aspect of the present invention, since the first convex portion is provided at the proximal end portion of the caulking claw, the second convex portion that contacts the first convex portion at the time of caulking is provided in the tank. By eliminating the need to raise the height of the protrusions more than necessary, it is not necessary to reduce the thickness of the seat plate and the tank, and the problem of the decrease in pressure strength caused by the thinning can be solved. Therefore, according to the present invention, the heat exchanger of the present invention can be applied as a heat exchanger for a CO2 air conditioner using CO2 having a high pressure as a refrigerant.

  According to the invention described in claim 2, since the height of the first convex portion is made lower than the protruding amount of the tube protruding into the header tank, the thickness of the seat plate at the proximal end portion of the caulking claw is secured. be able to.

  According to the invention described in claim 3, since the total sum of the heights of the first convex portion and the second convex portion is made the same as the protruding amount of the tube protruding into the header tank, the height of the convex portion is the conventional structure. Both can be made lower than the above, and it is possible to secure a sufficient pressure resistance in the header tank.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 shows a heat exchanger according to the present embodiment, (A) is an enlarged perspective view of a main part of the heat exchanger, (B) is an enlarged cross-sectional view of a main part showing a portion into which a tube is inserted, and FIG. The seat plate which comprises the heat exchanger of this Embodiment is shown, (A) is the front view, (B) is the side view of the principal part, FIG. 3 is the tank which comprises the heat exchanger of this Embodiment. (A) is a front view thereof, (B) is a side view of the main part thereof, FIG. 4 is a header tank constituting the heat exchanger of the present embodiment, (A) is a sectional view thereof, ( B) is a side view of the main part, FIG. 5 is a header tank provided with a convex part only on the tank side, (A) is a sectional view thereof, and (B) is a side view of the main part.

  As shown in FIG. 1, the heat exchanger according to the present embodiment includes a caulking claw formed on the seat plate 2 on the seat plate 2 in which the tube ends 1A are inserted and fixed and the tubes 1 are arranged at predetermined intervals. The header tank 5 is formed by fixing the tank 4 by bending and crimping 3.

  As shown in FIGS. 1 and 2, the seat plate 2 includes a bottom plate portion 6 having a rectangular shape, and side plate portions 7 rising along the longitudinal direction from both edges in the width direction of the bottom plate portion 6. The part 6 and the side plate part 7 are formed in a substantially U-shaped cross section. In the bottom plate portion 6, tube insertion holes 8 for projecting the tube end portion 1 </ b> A into the header tank 5 are formed at predetermined intervals in the longitudinal direction. On the other hand, the side plate portion 7 is provided with a caulking claw 3 for caulking and fixing the tank 4 and the seat plate 2. A plurality of caulking claws 3 are formed on the upper end surface 7 a of the side plate portion 7 along the longitudinal direction thereof, and are respectively provided at positions corresponding to the tubes 1 inserted into the seat plate 2.

  The seat plate 2 composed of the bottom plate portion 6 and the side plate portion 7 is provided with a first convex portion 9 that receives a load applied to the tank 4 when the caulking claw 3 is caulked. The 1st convex part 9 is formed by protruding the bending part by which the baseplate part 6 in which the crimping nail | claw 3 was formed, and the side-plate part 7 are connected from the outer side to the inner side with a jig | tool.

  As shown in FIGS. 1 and 3, the tank 4 includes a first flow path component 10, a second flow path component 11 adjacent to the first flow path component 10, and a partition 12 that partitions these flow paths. The first flow path component 10, the second flow path component 11, and the partition 12 have a substantially inverted W cross section.

  The first flow path component 10 and the second flow path component 11 are both formed in an inverted U-shaped cross section. The partition 12 connects the first flow path component 10 and the second flow path component 11 and comes into close contact with the bottom plate 6 of the seat plate 2. The partition 12 is formed with a corrugated portion 13 having a waveform along the longitudinal direction at a position corresponding to the insertion portion of the tube 1 so that the inserted tube 1 does not contact the tank 4. ing. The first flow path component 10 and the second flow path component 11 are communicated with each other by the uneven portion 13.

  The tank 4 is provided with a second convex portion 14 that contacts the first convex portion 9 when the caulking claw 3 is caulked. The second convex portions 14 are respectively positioned at positions opposed to the first convex portions 9 formed on the seat plate 2 on the front end surfaces 10a and 11a of the first flow path constituting portion 10 and the second flow passage constituting portion 11. Projected.

  The following relationship exists between the height A of the first convex portion 9, the height B of the second convex portion 14, and the protruding amount C of the tube 1 protruding into the header tank 5. The height A of the first protrusion 9 is set lower than the protruding amount C of the tube 1 protruding into the header tank 5. Further, the total height (A + B) of the first convex portion 9 and the second convex portion 14 is made the same as the protruding amount C of the tube 1 protruding into the header tank 5.

  In the header tank 5 having such a relationship, as shown in FIG. 4, when the caulking claw 3 is bent and caulked with respect to the tank 4 using a caulking jig, the first protrusion formed on the seat plate 2 is formed. Since the second convex portion 14 formed on the tank 4 is in contact with the portion 9, the load applied to the tank 4 by caulking is transmitted to the first convex portion 9 via the second convex portion 14. Therefore, deformation of the seat plate 2 can be prevented by a load applied from the tank 4 to the seat plate 2 by caulking the caulking claws 3.

  Moreover, in this Embodiment, since the 1st convex part 9 and the 2nd convex part 14 were provided in both the seat board 2 and the tank 4, the crimping nail | claw 3 can be crimped stably. On the other hand, as shown in FIG. 5, when the second convex portion 14 is provided only in the tank 4 and the first convex portion 9 is not provided in the seat plate 2, the first flow path and the second flow are provided. A caulking force acts in the direction of narrowing the channel width of the path, and the caulking claw 3 cannot be caulked stably.

  Thus, according to the heat exchanger of the present embodiment, the first convex portion 9 is provided at the proximal end portion of the caulking claw 3, while the second convex portion 14 that comes into contact with the first convex portion 9 during caulking. Is provided in the tank 4, so that it is not necessary to increase the height of both convex portions more than necessary, so that the thickness of the seat plate 2 and the tank 4 does not have to be reduced, and the pressure resistance generated by the reduction in thickness. The problem of strength reduction can be solved. Therefore, according to the present invention, the heat exchanger of the present invention can be applied as a heat exchanger for a CO2 air conditioner using CO2 having a high pressure as a refrigerant.

  Moreover, according to the heat exchanger of this Embodiment, since the height A of the 1st convex part 9 was made lower than the protrusion amount C of the tube 1 which protrudes in the header tank 5, the base end part of the crimping claw 3 The thickness of the seat plate 2 can be ensured.

  Moreover, according to the heat exchanger of this Embodiment, the sum total (A + B) of the height of the 1st convex part 9 and the 2nd convex part 14 is made the same as the protrusion amount C of the tube 1 which protrudes in the header tank 5. As a result, the height of the convex portions can be reduced as compared with the conventional structure, and the pressure-resistant strength in the header tank 5 can be sufficiently secured.

  The specific embodiment to which the present invention is applied has been described above, but the embodiment is an example of the present invention and is not limited to the embodiment.

The heat exchanger of this Embodiment is shown, (A) is the principal part expansion perspective view of the heat exchanger, (B) is a principal part expanded sectional view which shows the part in which the tube was inserted. The seat board which comprises the heat exchanger of this Embodiment is shown, (A) is the front view, (B) is the side view of the principal part. The tank which comprises the heat exchanger of this Embodiment is shown, (A) is the front view, (B) is the side view of the principal part. The header tank which comprises the heat exchanger of this Embodiment is shown, (A) is the sectional drawing, (B) is the side view of the principal part. The header tank which provided the convex part only in the tank side is shown, (A) is the sectional drawing, (B) is the side view of the principal part. The header tank which comprises the conventional heat exchanger is shown, (A) is the sectional drawing, (B) is the side view of the principal part. The header tank which comprises the conventional heat exchanger is shown, (A) is sectional drawing of the part in which the tube was inserted, (B) is a side view of the principal part. The header tank which comprises the conventional heat exchanger is shown, (A) is sectional drawing of the header tank which shows that the convex part peripheral part was made thin, (B) is a side view of the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Tube 2 ... Seat plate 3 ... Caulking claw 4 ... Tank 5 ... Header tank 6 ... Bottom plate part 7 ... Side plate part 9 ... 1st convex part 10 ... 1st flow path structure part 11 ... 2nd flow path structure part 14 ... 2nd convex part A ... Height of 1st convex part B ... Height of 2nd convex part C ... Projection amount of the tube which protrudes in a header tank

Claims (3)

The caulking claw (3) formed on the seat plate (2) is bent and crimped on the seat plate (2) in which the tube end (1A) is inserted and fixed to arrange the plurality of tubes (1) at predetermined intervals. In the heat exchanger having a header tank (5) formed by fixing the tank (4) by
A first convex portion (9) serving as a receiver for the tank (4) is provided at a base end portion where the caulking claw (3) is formed, and a second convex portion that contacts the first convex portion (9) during caulking. A heat exchanger characterized in that a part (14) is provided in the tank (4). The heat exchanger according to claim 1,
The heat exchanger, wherein the height (A) of the first protrusion (9) is made lower than the protruding amount (C) of the tube (1) protruding into the header tank (5). The heat exchanger according to claim 1 or 2,
The total height (A + B) of the first convex portion (9) and the second convex portion (14) is the same as the protruding amount (C) of the tube (1) protruding into the header tank (5). A heat exchanger characterized by that.

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