JP2024049695A - Heat exchanger and its manufacturing method - Google Patents

Abstract

[Problem] To facilitate a process of aligning a heat exchanger with a brazing device. [Solution] A heat exchanger 10 includes fins, a tube sheet 14, and heat transfer tubes 12 penetrating the fins and the tube sheet 14. The tube sheet 14 includes a first tube sheet 141, a second tube sheet 142, a third tube sheet 143, and a fourth tube sheet 144. An opening 142x for alignment with the brazing device 100 is formed in the second tube sheet 142. [Selected Figure] Fig. 6

Description

This disclosure relates to a heat exchanger and a method for manufacturing the same.

Patent Document 1 discloses that a heat exchanger is mounted on a conveyor so that the opening (brazed part) of a U-shaped pipe is located at the upper end, and while being guided by a pair of guides extending along the conveying direction, a bent pipe is automatically brazed to the opening of the U-shaped pipe.

JP 2003-039164 A

Patent Document 1 discloses that the heat exchanger (heat exchanger precursor) is guided by a guide. However, Patent Document 1 does not disclose aligning the heat exchanger precursor with respect to the brazing device. Therefore, with the technology disclosed in Patent Document 1, the process of aligning the heat exchanger precursor with respect to the brazing device can be complicated.

The objective of the present disclosure is to provide a heat exchanger and a method for manufacturing the same that can easily perform the alignment process of the heat exchanger precursor to the brazing device.

The heat exchanger according to the first aspect of the present disclosure comprises fins, a tube sheet, and a heat transfer tube penetrating the fins and the tube sheet, and the tube sheet has an opening for alignment with a brazing device.

According to the first aspect of the present disclosure, the process of aligning the heat exchanger precursor with the brazing device can be easily performed by inserting the pin of the brazing device into the opening of the tube sheet.

In the heat exchanger according to the second aspect of the present disclosure, in the first aspect, the opening may be circular. In this case, it is easy to insert a pin into the opening.

In the heat exchanger according to the third aspect of the present disclosure, in the second aspect, the tube sheet may have a plurality of the openings. In this case, rotation of the heat exchanger precursor relative to the brazing device after the pin is inserted can be suppressed.

In the heat exchanger according to the fourth aspect of the present disclosure, in the first aspect, the opening may be polygonal. In this case, rotation of the heat exchanger precursor relative to the brazing device after the pin is inserted can be suppressed.

A fifth aspect of the present disclosure is a heat exchanger according to any one of the first to fourth aspects, in which the tube sheet includes a first tube sheet and a second tube sheet, and the heat exchanger may be of a bent type in which the first tube sheet and the second tube sheet are arranged at an angle. In this case, in a bent type heat exchanger in which accurate alignment is difficult to achieve, the alignment accuracy with respect to the brazing device is improved by providing an alignment opening in the tube sheet.

The heat exchanger according to the sixth aspect of the present disclosure may be the fifth aspect, in which the first tube sheet and the second tube sheet are arranged at an angle to form a recess, the first tube sheet and the second tube sheet have one end and the other end that define the recess, and the opening may be provided near the one end of at least one of the first tube sheet and the second tube sheet. In this case, the opening is provided near the center of gravity of the entire tube sheet, improving the alignment accuracy of the heat exchanger precursor with respect to the brazing device.

The seventh aspect of the present disclosure relates to a heat exchanger according to the fifth or sixth aspect, and at least one of the first tube sheet and the second tube sheet may have a plurality of the openings arranged along the longitudinal direction of the tube sheet. In this case, the accuracy of aligning the heat exchanger precursor with the brazing device is improved compared to when there is only one opening.

The heat exchanger according to the eighth aspect of the present disclosure is any one of the fifth to seventh aspects, in which the number of the heat transfer tubes arranged along the longitudinal direction of the second tube plate is greater than the number of the heat transfer tubes arranged along the longitudinal direction of the first tube plate, and the second tube plate may have the openings. In this case, the alignment accuracy of the second tube plate, which has many brazing points, with respect to the brazing device is improved.

The ninth aspect of the present disclosure is a heat exchanger according to any one of the fifth to eighth aspects, wherein the tube sheet further includes a third tube sheet sandwiching the second tube sheet between the first tube sheet and the third tube sheet, the heat transfer tube further includes a third heat transfer tube penetrating the third tube sheet, and the heat exchanger is a bent type in which the first tube sheet, the second tube sheet, and the third tube sheet are arranged at an angle, and the second tube sheet may have the opening. In this case, compared to when the first tube sheet or the third tube sheet has an opening, the number of bends between the tube sheet having the opening and the tube sheet furthest from the tube sheet is reduced, and the alignment accuracy of the furthest tube sheet with respect to the brazing device is improved.

A heat exchanger according to a tenth aspect of the present disclosure is, in any one of the fifth to eighth aspects above, the tube sheet further includes a third tube sheet sandwiching the second tube sheet between the tube sheet and the first tube sheet, the heat transfer tube further includes a third heat transfer tube penetrating the third tube sheet, the heat exchanger is a bent type in which the first tube sheet, the second tube sheet, and the third tube sheet are arranged at an angle, and the first tube sheet, the second tube sheet, and the third tube sheet may have the openings. In this case, the alignment accuracy of the entire tube sheet is improved.

The heat exchanger according to an eleventh aspect of the present disclosure is any one of the first to tenth aspects, in which the tube sheet has an outer portion disposed outside the fins when viewed from the direction in which the heat transfer tubes extend, and the openings may be provided in the outer portion. In this case, the alignment process can be performed while preventing deformation or damage to the fins due to pins.

The heat exchanger according to the twelfth aspect of the present disclosure is any one of the first to eleventh aspects, in which the heat transfer tubes may be made of aluminum. In this case, weight reduction and cost reduction can be achieved.

In the heat exchanger according to the thirteenth aspect of the present disclosure, in any one of the first to twelfth aspects, the thickness of the tube sheet may be 1 mm or more. In this case, a certain level of strength can be ensured.

The method for manufacturing a heat exchanger according to a fourteenth aspect of the present disclosure includes an alignment step in which a heat exchanger precursor, which includes a tube sheet having an opening and a heat transfer tube penetrating the tube sheet, is aligned with respect to the brazing device by inserting a pin of the brazing device into the opening, and a brazing step in which, after the alignment step, the heat transfer tube is brazed using the brazing device.

According to the fourteenth aspect of the present disclosure, similar to the first aspect, the process of aligning the heat exchanger precursor with the brazing device can be easily performed by inserting the pin of the brazing device into the opening of the tube sheet.

In the method for manufacturing a heat exchanger according to a fifteenth aspect of the present disclosure, the tube sheet includes a first tube sheet and a second tube sheet, the heat transfer tubes include a first heat transfer tube, a second heat transfer tube, and a third heat transfer tube penetrating the first tube sheet, and a fourth heat transfer tube, a fifth heat transfer tube, and a sixth heat transfer tube penetrating the second tube sheet, and the brazing process may include a first process of brazing a bend tube to the first heat transfer tube and the second heat transfer tube and brazing a bend tube to the fourth heat transfer tube and the fifth heat transfer tube while the first tube sheet and the second tube sheet are arranged in a straight line, a second process of bending the heat exchanger precursor after the first process so that the first tube sheet and the second tube sheet are arranged at an angle, and a third process of brazing a connecting tube connecting the third heat transfer tube and the sixth heat transfer tube to the third heat transfer tube and the sixth heat transfer tube after the second process. In this case, brazing is performed within each tube sheet in the first step before the second step of bending the heat exchanger precursor. Then, after bending the heat exchanger precursor in the second step, brazing of the connecting tubes that connect the heat transfer tubes of the two tube sheets is performed in the third step. This allows brazing to be performed with high precision in a bent-type heat exchanger.

1 is a front view of an air conditioner including a heat exchanger according to a first embodiment of the present disclosure with an exterior panel removed. FIG. 2 is a right side view of the heat exchanger shown in FIG. 1 . FIG. 2 is a flow chart showing a method for manufacturing the heat exchanger shown in FIG. 1 . FIG. 4 is a right side view showing step S1 in FIG. 3 . FIG. 4 is a right side view showing step S2 in FIG. 3 . FIG. 4 is a right side view showing step S3 in FIG. 3 . FIG. 11 is a right side view of a heat exchanger according to a second embodiment of the present disclosure. FIG. 13 is a right side view of a heat exchanger according to a third embodiment of the present disclosure.

First Embodiment
First, the overall configuration of an air conditioner 1 including a heat exchanger 10 according to a first embodiment of the present disclosure will be described with reference to Fig. 1. In the following description, the directions of "up", "down", "right", "left", "front" and "rear" refer to the directions when the air conditioner 1 is installed as shown in Fig. 1.

The air conditioner 1 has a heat exchanger 10, a fan and a filter (not shown), a frame 1f, and an exterior panel (not shown). The air conditioner 1 is an indoor unit, and the heat exchanger 10 is an indoor heat exchanger.

The frame 1f forms the bottom and rear of the air conditioner 1. The frame 1f is long in one direction, and is attached to the indoor wall via a mounting plate (not shown) so that the one direction is along the left-right direction in FIG. 1. The fan, exterior panel, and heat exchanger 10 are attached to the frame 1f. The filter is attached to the exterior panel.

The heat exchanger 10 is long in one direction (the left-right direction in Figure 1) like the frame 1f.

Next, the configuration of the heat exchanger 10 will be described in detail with reference to Figures 1 and 2.

As shown in FIG. 1, the heat exchanger 10 includes a plurality of fins 11, a plurality of heat transfer tubes 12, and a tube sheet 14. The heat transfer tubes 12 and the tube sheet 14 are made of aluminum.

Each of the multiple fins 11 is a thin plate, and is arranged so that the plate surface is aligned along the up-down direction and the front-rear direction. The multiple fins 11 are arranged at equal intervals in the left-right direction.

Each of the multiple heat transfer tubes 12 extends in the left-right direction and penetrates multiple fins 11.

Note that, for simplicity, in FIG. 1, only a portion of the heat transfer tubes 12 is depicted, and only a portion of the fins 11 is depicted.

The left end of each heat transfer tube 12 is connected to the left end of another heat transfer tube 12 via a U-shaped bent section 21. The right end of each heat transfer tube 12 is connected to the right end of another heat transfer tube 12 via a bend tube 22, or is connected to a refrigerant tube 17. The bend section 21 is located on the left side of the multiple fins 11. The bend tube 22 is located on the right side of the multiple fins 11.

The bent portion 21 is formed integrally with the heat transfer tube 12, and a pair of heat transfer tubes 12 and the bent portion 21 are formed as a U-shaped tube by bending a single tube. On the other hand, the bend tube 22 is welded to the open end (the right end of the heat transfer tube 12) of the U-shaped tube formed by bending as described above.

The components (refrigerant pipe 17, flow divider 18, expansion valve 19, etc.) for supplying refrigerant to the heat transfer tube 12 are arranged near the bend tube 22.

The tube sheet 14 is arranged so that the plate surface is aligned in the up-down and front-rear directions, and is located to the right of the multiple fins 11. Multiple heat transfer tubes 12 penetrate the tube sheet 14. There is almost no gap between the tube sheet 14 and each heat transfer tube 12, and the tube sheet 14 supports the fins 11 and multiple heat transfer tubes 12. A bend tube 22 is arranged on the right side of the tube sheet 14, i.e., on the opposite side of the multiple fins 11 from the tube sheet 14. Although not shown in the figure, a tube sheet is also arranged on the left side of the multiple fins 11.

As shown in FIG. 2, the tube sheets 14 include a first tube sheet 141, a second tube sheet 142, a third tube sheet 143, and a fourth tube sheet 144. The thickness of each of the tube sheets 141-144 is 1 mm or more. The heat exchanger 10 is of a bent type in which the first to fourth tube sheets 141-144 are arranged at an angle to the adjacent tube sheets 141-144. A plurality of heat transfer tubes 12 penetrate each of the first to fourth tube sheets 141-144. A pair of heat transfer tubes 12 in each U-shaped tube (a U-shaped tube formed by bending a single tube and a pair of heat transfer tubes 12 and a bent portion 21) penetrates the same tube sheet among the first to fourth tube sheets 141-144.

The first to fourth tube sheets 141 to 144 are arranged at an angle to form a recess C. The first to fourth tube sheets 141 to 144 each have one end 141a to 144a and the other end 141b to 144b in the width direction of the tube sheet. The one ends 141a to 144a define the recess C. The other ends 141b to 144b are farther away from the recess C than the one ends 141a to 144a.

The third tube sheet 143 is located at the rearmost position among the first to fourth tube sheets 141 to 144, and sandwiches the second tube sheet 142 between it and the first tube sheet 141. The third tube sheet 143 is connected to the second tube sheet 142, the second tube sheet 142 is connected to the first tube sheet 141, and the first tube sheet 141 is connected to the fourth tube sheet 144. The fourth tube sheet 144 is located at the bottommost position among the first to fourth tube sheets 141 to 144.

In each of the tube sheets 141 to 144, at least one of the heat transfer tubes 12 is connected to another heat transfer tube 12 via a bend tube 22. The bend tubes 22 provided in the tube sheets 141, 142, and 144 are so-called U-bend tubes. One heat transfer tube 12 penetrating the second tube sheet 142 and one heat transfer tube 12 penetrating the first tube sheet 141 are connected to each other by a U-shaped connecting tube 25. Similarly, one heat transfer tube 12 penetrating the first tube sheet 141 and one heat transfer tube 12 penetrating the fourth tube sheet 144 are connected to each other by a U-shaped connecting tube 25.

The number of heat transfer tubes 12 (6) arranged along the longitudinal direction of the second tube plate 142 is greater than the number of heat transfer tubes 12 (4) arranged along the longitudinal direction of the first tube plate 141.

Two openings 142x are formed in the second tube sheet 142. The two openings 142x are for alignment with the brazing device 100 (see Figures 4 and 5) described below, and each has a circular shape. The two openings 142x are provided near one end 142a of the second tube sheet 142 and are arranged along the longitudinal direction of the second tube sheet 142.

The second tube sheet 142 has a region R1 that overlaps in the left-right direction with the arrangement space of the fins 11 (see FIG. 1), and a region R2 outside the region R1. Region R2 is a region that is arranged outside the fins 11 when viewed from the left-right direction (the direction in which the heat transfer tubes 12 extend), and corresponds to the "outer portion" of this disclosure. Two openings 142x are provided in region R2.

The second tube sheet 142 further has an opening 142y. The opening 142y is an opening for fixing to the frame 1f and has a rectangular shape. The first tube sheet 141 has a hook 141y. A claw (not shown) of the frame 1f is caught in the opening 142y, and the hook 141y is caught in an opening (not shown) of the frame 1f, thereby fixing the tube sheet 14 to the frame 1f.

Next, a method for manufacturing the heat exchanger 10 will be described with reference to Figures 3 to 5.

First, as shown in Figures 3 and 4, with the first to fourth tube sheets 141 to 144 arranged in a straight line, the two cylindrical pins 101 of the brazing device 100 are inserted into each opening 142x to align the heat exchanger precursor 10X with respect to the brazing device 100 (S0: alignment process).

The heat exchanger precursor 10X includes fins 11 (see FIG. 1), a tube sheet 14, a heat transfer tube 12, and a bent portion 21, but does not include a bend tube 22 or a connecting tube 25. The brazing device 100 is disposed in a portion of the second tube sheet 142 that faces the region R2.

After S0, as shown in Figs. 3 and 4, the bend tube 22 is brazed in each of the first to fourth tube sheets 141 to 144 (S1: first step). Specifically, as shown in Fig. 4, the bend tube 22 is brazed to the two heat transfer tubes 121, 122 that penetrate the first tube sheet 141, and the bend tube 22 is brazed to the two heat transfer tubes 124, 125 that penetrate the second tube sheet 142. The two heat transfer tubes 121, 122 each constitute a different U-shaped tube (a U-shaped tube formed by bending one tube and a pair of heat transfer tubes 12 and a bent portion 21). The two heat transfer tubes 124, 125 each constitute a different U-shaped tube.

After S1, the heat exchanger precursor 10X is bent so that the first to fourth tube plates 141 to 144 are arranged at an angle, as shown in FIG. 5 (S2: second step).

After S2, as shown in FIG. 6, the connecting tubes 25 connecting the tube sheets 141 and 142 and the connecting tubes 25 connecting the tube sheets 141 and 144 are brazed (S3: third step). Specifically, the connecting tubes 25 connecting the heat transfer tubes 123 and 126 are brazed to one heat transfer tube 123 penetrating the first tube sheet 141 and one heat transfer tube 126 penetrating the second tube sheet 142. In addition, the connecting tubes 25 connecting the heat transfer tubes 127 and 128 are brazed to one heat transfer tube 127 penetrating the first tube sheet 141 and one heat transfer tube 128 penetrating the fourth tube sheet 144. This completes the heat exchanger 10 (see FIG. 2).

S1 to S3 are steps for brazing the heat transfer tube 12 using the brazing apparatus 100, and correspond to the "brazing step" of the present disclosure. Heat transfer tube 121 corresponds to the "first heat transfer tube" of the present disclosure, heat transfer tube 122 corresponds to the "second heat transfer tube" of the present disclosure, and heat transfer tube 123 corresponds to the "third heat transfer tube" of the present disclosure. Heat transfer tube 124 corresponds to the "fourth heat transfer tube" of the present disclosure, heat transfer tube 125 corresponds to the "fifth heat transfer tube" of the present disclosure, and heat transfer tube 126 corresponds to the "sixth heat transfer tube" of the present disclosure.

As described above, in this embodiment, the second tube sheet 142 is formed with an opening 142x for alignment with the brazing device 100 (see FIG. 6). By inserting the pin 101 of the brazing device 100 into the opening 142x, the alignment process of the heat exchanger precursor 10X with the brazing device 100 can be easily performed.

The opening 142x is circular (see FIG. 6). In this case, it is easy to insert the pin 101 into the opening 142x.

The tube sheet 14 has multiple openings 142x (see FIG. 6). In this case, rotation of the heat exchanger precursor 10X relative to the brazing device 100 after the pin 101 is inserted can be suppressed.

The heat exchanger 10 is a bent type in which the first to fourth tube plates 141 to 144 are arranged at an angle (see FIG. 6). In this case, the bent type heat exchanger 10 is difficult to align accurately, but by providing the openings 142x, the alignment accuracy with respect to the brazing device 100 is improved.

The first to fourth tube sheets 141 to 144 are arranged at an angle to form a recess C (see FIG. 2). The opening 142x is provided near one end 142a that defines the recess C in the second tube sheet 142. In this case, the opening 142x is provided near the center of gravity of the entire tube sheet 14, improving the alignment accuracy of the heat exchanger precursor 10X with respect to the brazing device 100.

The second tube sheet 142 has a plurality of openings 142x arranged along the longitudinal direction of the tube sheet (see FIG. 2). In this case, the accuracy of aligning the heat exchanger precursor 10X with the brazing device 100 is improved compared to when there is only one opening 142x.

The number of heat transfer tubes 12 arranged along the longitudinal direction of the second tube sheet 142 is greater than the number of heat transfer tubes 12 arranged along the longitudinal direction of the first tube sheet 141 (see FIG. 2). In this case, the second tube sheet 142 has openings 142x, which improves the alignment accuracy of the second tube sheet 142, which has many brazing points, relative to the brazing device 100.

The second tube sheet 142, which is located between the first tube sheet 141 and the third tube sheet 143, has an opening 142x (see FIG. 2). In this case, compared to when the first tube sheet 141 or the third tube sheet 143 has an opening, the number of bending points between the tube sheet having the opening and the tube sheet furthest from the tube sheet is reduced, improving the accuracy of aligning the furthest tube sheet with respect to the brazing device 100.

The opening 142x is provided in region R2 (the outer portion located outside the fin 11) (see FIG. 2). In this case, the alignment process can be performed while preventing the pin 101 from deforming or damaging the fin 11.

The heat transfer tube 12 is made of aluminum. In this case, weight reduction and cost reduction can be achieved.

The thickness of tube sheets 141 to 144 is 1 mm or more. In this case, a certain level of strength can be ensured.

In the method for manufacturing the heat exchanger 10, before the step (S2) of bending the heat exchanger precursor 10X, the first to fourth tube sheets 141 to 144 are arranged in a straight line and the bent tubes 22 are brazed within each of the first to fourth tube sheets 141 to 144 (S1). Then, after bending the heat exchanger precursor 10X in S2, the connecting tubes 25 that connect the heat transfer tubes 12 of the two tube sheets 141, 142 are brazed (S3). This allows brazing to be performed with high precision in the bent type heat exchanger 10.

Second Embodiment
Next, referring to FIG. 7, a heat exchanger 210 according to a second embodiment of the present disclosure will be described.

The heat exchanger 210 according to the second embodiment has the same configuration as the heat exchanger 10 according to the first embodiment, except for the number and shape of the alignment openings.

In the second embodiment, the tube sheet 14 has one alignment opening 242x. The opening 242x is rectangular. In this case, the pin 101 (see FIG. 6) of the brazing device 100 is prismatic rather than cylindrical.

In this embodiment, the opening 242x is polygonal. In this case, rotation of the heat exchanger precursor relative to the brazing device 100 after the pin 101 is inserted into the opening 242x can be suppressed.

Third Embodiment
Next, referring to FIG. 8, a heat exchanger 310 according to a third embodiment of the present disclosure will be described.

The heat exchanger 310 according to the third embodiment has the same configuration as the heat exchanger 10 according to the first embodiment, except for the arrangement of the alignment openings.

In the third embodiment, the tube sheet 14 has three alignment openings 341x, 342x, and 343x. Opening 341x is formed in the first tube sheet 141, opening 342x is formed in the second tube sheet 142, and opening 343x is formed in the third tube sheet 143.

In this embodiment, the first to third tube sheets 141 to 143 each have alignment openings 341x, 342x, and 343x, improving the alignment accuracy of the entire tube sheet 14 relative to the brazing device 100.

<Modification>
In the above-described embodiment, a heat exchanger precursor including fins is aligned with a brazing apparatus and a brazing process is performed, but this is not limited thereto, and a heat exchanger precursor not including fins may be aligned with a brazing apparatus and a brazing process may be performed, and then fins may be attached to the heat exchanger precursor.

In the second embodiment, the opening 242x is rectangular, but it may be a polygon other than a rectangle (e.g., a pentagon).

The "heat exchanger" according to the present disclosure is not limited to an indoor heat exchanger, but may also be an outdoor heat exchanger.

Although the embodiments have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims.

1 Air conditioner 10; 210; 310 Heat exchanger 11 Fin 12 Heat transfer tube 121 First heat transfer tube 122 Second heat transfer tube 123 Third heat transfer tube 124 Fourth heat transfer tube 14 Tube plate 141 First tube plate 141a One end 141b Other end 142 Second tube plate 142a One end 142b Other end 142x; 242x Opening 143 Third tube plate 143a One end 143b Other end 22 Bend tube 25 Connecting tube 10X Heat exchanger precursor 100 Brazing device 101 Pin 341x, 342x, 343x Opening C Recess R2 Region (outer part)

Claims (15)

Finn and
A tube sheet;
a heat transfer tube penetrating the fin and the tube sheet;
The tube sheet has openings for alignment with a brazing tool. The heat exchanger of claim 1, wherein the opening is circular. The heat exchanger of claim 2, wherein the tube sheet has a plurality of the openings. The heat exchanger of claim 1, wherein the opening is polygonal. The tube sheet includes a first tube sheet and a second tube sheet,
2. The heat exchanger according to claim 1, wherein the heat exchanger is of a bent type in which the first tube sheet and the second tube sheet are disposed at an angle. The first tube sheet and the second tube sheet are disposed at an angle to form a recess,
The first tube sheet and the second tube sheet have one end and another end that define the recess,
The heat exchanger according to claim 5 , wherein the opening is provided in at least one of the first tube sheet and the second tube sheet near the one end. The heat exchanger according to claim 5, wherein at least one of the first tube sheet and the second tube sheet has a plurality of the openings arranged along the longitudinal direction of the tube sheet. the number of the heat transfer tubes arranged along the longitudinal direction of the second tube plate is greater than the number of the heat transfer tubes arranged along the longitudinal direction of the first tube plate,
The heat exchanger of claim 5 , wherein the second tube sheet has the openings. The tube sheet further includes a third tube sheet sandwiching the second tube sheet between the first tube sheet and a third tube sheet,
The heat exchanger is a bent type in which the first tube plate, the second tube plate, and the third tube plate are arranged at an angle,
The heat exchanger of claim 5 , wherein the second tube sheet has the openings. The tube sheet further includes a third tube sheet sandwiching the second tube sheet between the first tube sheet and a third tube sheet,
The heat exchanger is a bent type in which the first tube plate, the second tube plate, and the third tube plate are arranged at an angle,
The heat exchanger of claim 5 , wherein the first tube sheet, the second tube sheet, and the third tube sheet have the openings. The tube sheet has an outer portion disposed outside the fins when viewed from a direction in which the heat transfer tubes extend,
The heat exchanger of claim 1 , wherein the opening is disposed in the outer portion. The heat exchanger of claim 1, wherein the heat transfer tube is made of aluminum. The heat exchanger according to any one of claims 1 to 12, wherein the thickness of the tube sheet is 1 mm or more. an alignment step of aligning a heat exchanger precursor including a tube sheet having an opening and a heat transfer tube penetrating the tube sheet with respect to the brazing device by inserting a pin of the brazing device into the opening;
a brazing step of brazing the heat transfer tube using the brazing apparatus after the positioning step;
A method for manufacturing a heat exchanger comprising the steps of: The tube sheet includes a first tube sheet and a second tube sheet,
The heat transfer tubes include a first heat transfer tube, a second heat transfer tube, and a third heat transfer tube which penetrate the first tube sheet, and a fourth heat transfer tube, a fifth heat transfer tube, and a sixth heat transfer tube which penetrate the second tube sheet,
The brazing step includes:
a first step of brazing a bend tube to the first heat transfer tube and the second heat transfer tube and brazing a bend tube to the fourth heat transfer tube and the fifth heat transfer tube in a state in which the first tube sheet and the second tube sheet are linearly arranged;
a second step of bending the heat exchanger precursor after the first step such that the first tube sheet and the second tube sheet are disposed at an angle;
a third step of brazing a connecting tube that connects the third heat transfer tube and the sixth heat transfer tube to the third heat transfer tube and the sixth heat transfer tube after the second step;
A method for manufacturing the heat exchanger of claim 14, comprising:

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