WO2015014255A1

WO2015014255A1 - Heat exchanger and machining method therefor

Info

Publication number: WO2015014255A1
Application number: PCT/CN2014/083128
Authority: WO
Inventors: 黄宁杰; 刘维华
Original assignee: 杭州三花微通道换热器有限公司
Priority date: 2013-08-02
Filing date: 2014-07-28
Publication date: 2015-02-05
Also published as: CN104344745A

Abstract

Provided are a heat exchanger (100) and a machining method for the heat exchanger. The heat exchanger (100) comprises a first header pipe (1), a second header pipe (2), several flat pipes (3) and several fins (4). The flat pipe (3) comprises an intermediate part (30), a first straight part (31) twisted relative to the intermediate part (30), a second straight part (32) twisted relative to the intermediate part (30), a first twist part (33) connecting the intermediate part (30) and the first straight part (31), and a second twist part (34) connecting the intermediate part (30) and the second straight part (32). The first straight part (31) and the second straight part (32) are respectively positioned at the two sides of the intermediate part (30) and roughly positioned in the same plane. Fins (4) are welded between adjacent first straight parts (31), and fins (4) are welded between adjacent second flat and straight parts (32).

Description

The present invention claims the priority of the Chinese patent application filed on August 2, 2013 by the Chinese Patent Office, the application number is 201310334799.3, and the invention is entitled "heat exchanger and its processing method". The content is incorporated herein by reference.

The invention relates to a heat exchanger and a processing method thereof, and belongs to the field of microchannel heat exchangers. Background technique

The design patent of CN 301439466 S, published on January 12, 2011, discloses a bent heat exchanger comprising two headers, a plurality of flat tubes and fins, wherein the flat tubes are along the middle portion thereof After twisting and bending, a smaller, bent heat exchanger is obtained. However, from the surface of the design, the intermediate portion protrudes from the heat exchanger after bending, and the bending size is difficult to control. More importantly, in the actual processing, if the twisting and bending of the flat tube are placed in the last process, the fins that have been installed before the twisting and bending tend to be pulled, resulting in heat exchange. Bad device.

Therefore, how to improve the processing technology of heat exchangers has become a technical problem to be solved in the industry. Summary of the invention

The invention provides a heat exchanger with better processing technology and a processing method thereof.

The present invention provides the following technical solution: A heat exchanger comprising a first header, a second header, and a plurality of flats connected between the first header and the second header a tube, and a plurality of fins located between adjacent flat tubes, the flat tube including an intermediate portion, a first straight portion that is twisted relative to the intermediate portion, and a second flat portion that is twisted relative to the intermediate portion a straight portion, a first torsion portion connecting the intermediate portion and the first straight portion, and a connection a second torsion portion of the second portion and the second straight portion, the first straight portion and the second straight portion are respectively located at two sides of the intermediate portion and substantially in the same plane, adjacent The fins are welded between the first straight portions, and the fins are also welded between the adjacent second straight portions, and the same layer is located along the extending direction of the flat tubes The fins are interrupted by the corresponding intermediate portion.

As a further improvement of the present invention, the first straight portion and the second straight portion located in the same layer are located on the same straight line, and the first straight portion and the second straight portion are twisted. The directions are the same or opposite, and the middle portions of all the flat tubes are oriented in the same direction.

As a further improvement of the present invention, the twisting angle of the first straight portion with respect to the intermediate portion is less than or equal to 90 degrees, and the twist angle of the second straight portion relative to the intermediate portion is less than or equal to 90 degrees. The intermediate portion is perpendicular to the first straight portion and the second straight portion.

The invention also provides a method for processing a heat exchanger, comprising the steps of:

51, providing a plurality of flat flat tubes, the first straight portion on one side of the intermediate portion and the second straight portion on the other side of the intermediate portion are referenced to an intermediate portion of each flat tube Torsing with respect to the intermediate portion, and the first straight portion after twisting is substantially in the same plane as the second straight portion;

52, bending the intermediate portion, the first straight portion and the second straight portion are close to each other, and the first straight portion and the second straight portion after bending Still roughly in the same plane;

53. Providing a first header and a second header, wherein the first and second headers are respectively provided with a plurality of punching holes, and the first straight portion is inserted into the corresponding of the first header Inserting the second straight portion into a corresponding punching hole of the second header in the punching hole, and between the adjacent first straight portions and adjacent to the second flat portion Arranging fins between the straight portions; and

S4, welding the flat tube with the first and second headers, welding the fins to the flat tube, and finally obtaining a bent heat exchanger. As a further improvement of the present invention, in step S1, the twist angle of the first straight portion relative to the intermediate portion is less than or equal to 90 degrees, and the twist of the second straight portion relative to the intermediate portion The angle is less than or equal to 90 degrees, and the first straight portion is the same as or opposite to the twist direction of the second straight portion.

As a further improvement of the present invention, in step S2, the first straight portion after the bending is located in the same horizontal plane as the second straight portion, and the first straight portion and the first portion The angle between the two straight portions is less than or equal to 90 degrees.

The invention also provides a method for processing a heat exchanger, comprising the steps of: s providing a plurality of flat flat tubes, the first one on the side of the intermediate portion with respect to the middle portion of each flat tube The straight portion and the second straight portion on the other side of the intermediate portion are twisted with respect to the intermediate portion, and the first straight portion after twisting is substantially the same as the second straight portion In the plane and on the same line;

S2', providing a first header and a second header, wherein the first and second headers are each provided with a plurality of punching holes, and the first straight portion is inserted into the first header Inserting the second straight portion into a corresponding punching hole of the second header in a corresponding punching hole, and between the adjacent first straight portions and adjacent to the second portion Arranging fins between the straight portions;

S3', the flat tube is welded to the first and second headers, and the fin is welded to the flat tube to obtain a flat heat exchanger;

S4', keeping the relative positional relationship between the fin and the first and second straight portions unchanged, and bending the intermediate portion to bring the first and second headers closer to each other, and finally obtaining A bent heat exchanger.

As a further improvement of the present invention, in step S1 ', a twist angle of the first straight portion with respect to the intermediate portion is less than or equal to 90 degrees, and the second straight portion is opposite to the middle portion The twist angle is less than or equal to 90 degrees, and the first straight portion is the same as or opposite to the twist direction of the second straight portion.

As a further improved technical solution of the present invention, in step S4', after the bending The first straight portion is located in the same horizontal plane as the second straight portion, and an angle between the first straight portion and the second straight portion is less than or equal to 90 degrees.

As a further improvement of the present invention, in step S4', a clamp is provided on both sides of the intermediate portion to maintain the relative position of the fin and the first and second straight portions. The relationship is unchanged and then the middle portion is bent.

Compared with the prior art, the heat exchanger of the present invention has been pre-twisted before the flat tube is bent, so that the flat tube will not be bent after the flat tube is bent, and the processing technique is better. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing the flat tube of the present invention after twisting and before bending.

2 is a perspective view of the heat exchanger of the present invention before being bent.

Figure 3 is a perspective view of the flat tube shown in Figure 1 after bending.

Figure 4 is a perspective view of the heat exchanger of the present invention after being bent.

Fig. 5 is a flow chart showing the processing method of the heat exchanger of the present invention in the first embodiment. Fig. 6 is a flow chart showing the processing method of the heat exchanger of the present invention in the second embodiment. detailed description

Referring to FIG. 1 and FIG. 2, the present invention discloses a heat exchanger 100 including a first header 1, a second header 2, and a first header and a second collector. A plurality of flat tubes 3 between the tubes 2, and a plurality of fins 4 between the adjacent flat tubes 3. In the illustrated embodiment of the invention, the heat exchanger 100 is a microchannel heat exchanger.

The first header 1 and the second header 2 are parallel to each other and spaced apart from each other on both sides of the heat exchanger 100, one of which is an inlet tube and the other is an outlet tube. In the illustrated embodiment of the present invention, in order to increase the withstand voltage of the entire heat exchanger 100, the first and second headers 1, 2 are both cylindrical. The first and second headers 1, 2 each extend in the vertical direction. Of course, in other implementations In the mode, the positional relationship of the first and second headers 1, 2 is not limited to the vertical direction. The first and second headers 1, 2 are each provided with a plurality of punching holes (not shown) for mounting the flat tubes 3.

Referring to FIG. 1, the flat tube 3 includes an intermediate portion 30, a first straight portion 31 that is twisted with respect to the intermediate portion 30, a second flat portion 32 that is twisted with respect to the intermediate portion 30, and a connecting intermediate portion 30 and The first torsion portion 33 of the first straight portion 31 and the second torsion portion 34 connecting the intermediate portion 30 and the second straight portion 32. In this embodiment, the intermediate portion 30, the first straight portion 31, and the second straight portion 32 are all in the shape of a flat tube, wherein the first straight portion 31 and the second straight portion 32 are always straight. The shape of the intermediate portion 30 is also substantially straight prior to subsequent possible bending operations. The first straight portion 31 and the second straight portion 32 are respectively located on both sides of the intermediate portion 30 and are substantially in the same plane (in the horizontal plane in the illustrated embodiment of the invention). In the illustrated embodiment of the present invention, the intermediate portion 30 is located in a vertical plane, and the first straight portion 31 is twisted inwardly about the first torsion portion 33 in the direction of the dotted arrow to a horizontal position, and the second straight portion 32 is substantially The direction of the line arrow is twisted outwardly about the second torsion 34 to a horizontal position. That is, in the illustrated embodiment of the present invention, the first straight portion 31 is opposite to the twisting direction of the second straight portion 32. Of course, it can be understood that, in other embodiments, the twist angle a of the first straight portion 31 and the first portion 31 with respect to the intermediate portion 30 is less than or equal to 90 degrees, and the twist angle of the second straight portion 32 relative to the intermediate portion 30 is a. Less than or equal to 90 degrees. It should be noted that although the first straight portion 31 and the second straight portion 32 have been referred to as "twisting", such a description is merely a relatively straightforward explanation for facilitating the understanding by those skilled in the art. In fact, the first straight portion 31 and the second straight portion 32 are completely flat straight tubes which do not themselves have a twisted structure or any other curved structure. In the present embodiment, the true torsion structure is the first torsion portion 33 and the second torsion portion 34, which connect the first straight portion 31 and the second straight portion 32 with the intermediate portion 30, and at the same time make A flat portion 31 and a second flat portion 32 form a degree of twist with respect to the intermediate portion 30. Specifically, in the embodiment, first, the intermediate portion 30 that has not been bent is placed in a vertical plane, and the first torsion portion 33 is end Connected to one end of the intermediate portion 30 in a vertical plane, and the other end is twisted inward in the direction of the dotted arrow to a horizontal position and then connected to the first straight portion 31 such that the first straight portion 31 is in a horizontal plane; The portion 34 is connected to the other end of the intermediate portion 30 in a vertical plane, and the other end is twisted outward in the direction of the solid arrow to a horizontal position, and then connected to the second straight portion 32, so that the second flat portion 32 is also It is in the horizontal plane, thus forming the specific structure of the flat tube 3 as described above. In the illustrated embodiment of the invention, the intermediate portion 30 is perpendicular to the first straight portion 31 and the second straight portion 32. The first straight portion 31 and the second straight portion 32 located on the same layer are located on the same straight line for assembly; here the "same straight line" is not strictly a straight line, but refers to the first straight portion 31. In the direction in which the second straight portion 32 extends and both are substantially in the same plane. That is, the first straight portion 31 and the second straight portion 32 located in the same layer are substantially in the same plane, and the extending directions of the first straight portion 31 and the second straight portion 32 in the same layer are the same Straight or roughly on the same line. The intermediate portions 30 of all of the flat tubes 3 are oriented in the same direction to facilitate subsequent bending, if desired.

Referring to FIG. 2, the fins 4 are welded between the adjacent first straight portions 31, and the fins 4 are also welded between the adjacent second flat portions 32 along the extending direction of the flat tubes 3 ( In the illustrated embodiment of the present invention, the fins 4 located in the same layer in the left-right direction are blocked by the respective intermediate portions 30; here, the meaning of "the fins 4 located in the same layer are blocked by the corresponding intermediate portion 30" can also be said. There is no further fin between the torsion and the intermediate portion, that is, the middle of the fin of this layer is cut off. The part of the partition is to facilitate subsequent bending (if needed). Specifically, "the fins 4 located in the same layer are interrupted by the corresponding intermediate portion 30" means that each two adjacent flat tubes 3 are only between the opposite first straight portions 31 and The fins 4 are welded between the second straight portions 32, and there are no welded fins 4 between the opposite intermediate portions 30. In the present embodiment, there is no welded fin 4 between the first torsion portions 33 and the second torsion portion 34 of each of the two adjacent flat tubes 3, that is, the first torsion portion 33 and the second torsion portion. 34 is also used as part of the partition fin 4.

It should be noted that, as shown in FIG. 2, the heat exchanger 100 of the present invention is assembled prior to assembly. The flat tube 3 has already been twisted, and therefore, after the fin 4 and the first and second headers 1, 2 are attached, welding can be performed.

As shown in Fig. 2, the heat exchanger 100 of the present invention is a straight heat exchanger before bending, and the heat exchanger of this structure is less susceptible to deformation and is easy to transport. Of course, if the customer is in use, the intermediate portion 30 of the heat exchanger 100 needs to be bent, because the heat exchanger 100 of the present invention has previously twisted the flat tube 3 before welding, in which case the customer As long as the simple bending is performed, the twisting is no longer required, and the fins 4 are not easily damaged.

The prior art processing generally involves first assembling and fixing a completely flat flat tube with a header and a fin. Then twist and bend the flat tube. The biggest problem with this type of process is that because torsion is a very complicated process that is difficult to control, it is very easy to cause strain and deformation of the nearby fins, resulting in poor products.

Referring to FIG. 5, the present invention also discloses a method for processing a heat exchanger, which comprises the following steps:

S 1 , as shown in FIG. 1 , with reference to the above, a plurality of flat flat tubes 3 are provided, and the first straight portion 31 on the side of the intermediate portion 30 is referenced to the intermediate portion 30 of each flat tube 3 . And the second flat portion 32 located on the other side of the intermediate portion 30 is twisted with respect to the intermediate portion 30, and the first straight portion 31 after twisting and the second straight portion 32 are substantially in the same plane.

It should be particularly noted here that although the first straight portion 31 and the second straight portion 32 are "twisted" in the step S1, such expression is only used to facilitate understanding by those skilled in the art. Intuitive statement. In fact, as shown in Fig. 1, and as described above in connection with the specific structure of the flat tube 3 provided by the present invention, the shape of the first straight portion 31 and the second straight portion 32 is completely flat straight tube, In the process disclosed herein, they are not themselves formed into a torsional structure or any other curved structure. In the present embodiment, the first torsion portion 33 and the second torsion portion 34 are actually twisted, which connect the first straight portion 31 and the second straight portion 32 with the intermediate portion 30 while The first straight portion 31 and the second straight portion 32 are opposite to the middle by the twisted structure formed by itself The portion 30 forms a certain degree of twist. Specifically, the specific processing of the step S 1 is as follows: as shown in FIG. 1 , the end of the first torsion portion 33 away from the intermediate portion 30 is twisted inward by a certain angle in the direction of the dotted arrow, and then connected to the first straight portion 31 . The first straight portion 31 and the intermediate portion 30 are twisted to a certain extent; and the second twist portion 34 is further twisted outwardly at a certain angle in the direction of the solid arrow 30, and then connected to the second straight portion 32. The second straight portion 32 and the intermediate portion 30 are twisted to some extent, while the first straight portion 31 and the second flat portion 32 are substantially in the same plane.

52, as shown in FIG. 3, the intermediate portion 30 is bent so that the first straight portion 31 and the second straight portion 32 are close to each other, and the first straight portion 31 and the second straight portion after the bending are The portion 32 is still substantially in the same plane; in the embodiment, the specific bending manner of the intermediate portion 30 is to bend the intermediate portion 30 into an arch or a substantially arch shape while making the first straight portion 31 and the first portion The two straight portions 32 are perpendicular or substantially perpendicular to each other to the arch axis or the substantially alternate axis of the intermediate portion 30 after the bending.

53. Referring to FIG. 4, the first header tube 2 and the second header tube 2 are provided. The first and second header tubes 1 and 2 are respectively provided with a plurality of punching holes, and the first straight portion 31 is inserted. In the corresponding punching hole of the first header 1, the second straight portion 32 is inserted into the corresponding punching hole of the second header 2, and between the adjacent first straight portions 31 and adjacent The fins 4 are arranged between the second straight portions 32.

54. The flat tube 3 is welded to the first and second headers 1, 2, and the fins 4 and the flat tubes 3 are welded to obtain a bent heat exchanger 100.

Specifically, as shown in FIG. 3, in step S2, the first straight portion 31 and the second straight portion 32 after bending are located in the same horizontal plane, and the first straight portion 31 and the second straight portion are The angle b between 32 is less than or equal to 90 degrees.

The processing method of the above heat exchanger 100 has a very good processing technique, because both the twisting and the bending of the flat tube 3 are completed without the interference of the fins 4, and the size after bending can be precisely controlled, which is convenient. Installation; In addition, it is impossible to have any influence on the fins 4 during the bending process, and the fins 4 are not deformed, thereby ensuring that the heat exchanger 100 has good performance. Heat exchange efficiency.

Referring to FIG. 6, the present invention also discloses another method for processing a heat exchanger, which comprises the following steps:

Sr , as shown in FIG. 1 , with reference to the above, a plurality of flat flat tubes 3 are provided, and the first flat portion 31 on the side of the intermediate portion 30 is referenced to the intermediate portion 30 of each flat tube 3 and The second straight portion 32 located on the other side of the intermediate portion 30 is twisted with respect to the intermediate portion 30, and the first straight portion 31 after twisting and the second straight portion 32 are substantially in the same plane and are on the same straight line. .

It should be particularly noted here that, similar to step S1 of the heat exchanger processing method shown in Fig. 5, it is mentioned in the step S1' that the first straight portion 31 and the second straight portion 32 are "twisted". "But such statements are only a straightforward statement to facilitate understanding by those skilled in the art. In fact, as shown in Fig. 1, and as described above in connection with the specific structure of the flat tube 3 provided by the present invention, the first straight portion 31 and the second straight portion 32 are completely flat and straight. In the process disclosed herein, they are not themselves formed into a torsional structure or any other curved structure. In the present embodiment, the torsion processing is actually the first torsion portion 33 and the second torsion portion 34 which connect the first straight portion 31 and the second straight portion 32 with the intermediate portion 30 while The first straight portion 31 and the second straight portion 32 are formed to have a certain degree of twist with respect to the intermediate portion 30 by the twisted structure formed by itself. The specific processing of the step S 1 is as follows: as shown in FIG. 1 , the end of the first torsion portion 33 away from the intermediate portion 30 is twisted inward by a certain angle in the direction of the dotted arrow, and then connected to the first straight portion 31 to make the first The straight portion 31 and the intermediate portion 30 form a certain degree of twist; and the second twist portion 34 is further twisted outward by a certain angle in the direction of the solid arrow 30, and then connected to the second straight portion 32 to make the second The straight portion 32 forms a certain degree of twist with the intermediate portion 30 while the first straight portion 31 and the second straight portion 32 are substantially in the same plane, and the first straight portion 31 and the second straight portion 32 are made. The direction of extension is also on the same line or roughly on the same line. S2', as shown in FIG. 2, the first header tube 2 and the second header tube 2 are provided. The first and second header tubes 1 and 2 are respectively provided with a plurality of punching holes, and the first straight portion 31 is provided. Inserting into the corresponding punching hole of the first header 1, inserting the second straight portion 32 into the corresponding punching hole of the second header 2, and between adjacent first straight portions 31 and adjacent The fins 4 are arranged between the second straight portions 32.

S3', the flat tube 3 is welded to the first and second headers 1, 2, and the fins 4 and the flat tube 3 are welded to obtain a flat heat exchanger 100 (refer to FIG. 2). .

S4', the relative positional relationship between the fins 4 and the first and second straight portions 31, 32 is unchanged, and the intermediate portion 30 is bent so that the first and second headers 1, 2 are close to each other, and finally A bent heat exchanger 100 (shown in Fig. 4); in the present embodiment, the specific bending manner of the intermediate portion 30 is to bend the intermediate portion 30 into an arch or a substantially arch shape while making The first straight portion 31 and the second straight portion 32 are perpendicular or substantially perpendicular to each other with respect to the axis of reversal or the substantially alternate axis of the intermediate portion 30 after the bending.

Referring to FIG. 3 and FIG. 4, in step S4', the first straight portion 31 after the bending is located in the same horizontal plane as the second straight portion 32, and the first straight portion 31 and the second straight portion are straight. The angle b between the portions 32 is less than or equal to 90 degrees.

Referring to FIG. 2, in step S4', a jig (not shown) is provided on both sides of the intermediate portion 30 (in the illustrated embodiment of the present invention, it is clamped to the AA line and the BB line). In order to maintain the relative positional relationship between the fins 4 and the first and second straight portions 31, 32, the intermediate portion 30 is then bent.

Similarly, since the heat exchanger 100 of the present invention has previously twisted the flat tube 3 before bending, in this case, the step S4' is simple to bend, and the fin 4 is not easily damaged. Moreover, in the illustrated embodiment of the present invention, the relative positional relationship between the first and second straight portions 31, 32 is fixed by the clamp holding fins 4, and in this case, the bending is not at all The fins 4 have any effect and do not cause the fins 4 to deform.

Therefore, the above second processing method also has a good processing technique, can accurately control the size after bending, and can ensure that the heat exchanger 100 has good heat exchange efficiency. The technical solution described. Although the present invention has been described in detail with reference to the embodiments of the present invention, those skilled in the art will understand that the invention may be modified or equivalently substituted without departing from the invention. The spirit and scope of the invention and its modifications are intended to be included within the scope of the appended claims.

Claims

Rights request

1. A heat exchanger, which includes a first header, a second header, a plurality of flat tubes connected between the first header and the second header, and an adjacent Several fins between flat tubes, characterized in that: the flat tubes include an intermediate portion, a first straight portion twisted relative to the intermediate portion, and a second straight portion twisted relative to the intermediate portion. , a first twisted portion connecting the middle portion and the first straight portion, and a second twisted portion connecting the middle portion and the second straight portion, the first straight portion and the second straight portion The second straight parts are respectively located on both sides of the middle part and are generally located in the same plane. The fins are welded between the adjacent first straight parts. The adjacent second straight parts are The fins are also welded between them, and the fins located on the same layer along the extension direction of the flat tube are separated by the corresponding middle portion.

2. The heat exchanger according to claim 1, characterized in that: the first straight portion and the second straight portion located on the same layer are located on the same straight line, and the first straight portion and the second straight portion are located on the same straight line. The twisting direction of the second straight portion relative to the middle portion is the same or opposite, and the middle portions of all flat tubes face the same direction.

3. The heat exchanger according to claim 2, characterized in that: a twist angle of the first straight portion relative to the middle portion is less than or equal to 90 degrees, and a twist angle of the second straight portion relative to the middle portion is less than or equal to 90 degrees. The twist angle of the middle part is less than or equal to 90 degrees, and the middle part is at least partially perpendicular to the first straight part and the second straight part.

4. The heat exchanger according to claim 1, characterized in that: the shape of the first straight part and the second straight part is a flat straight tube, and one end of the first twisted part and the middle part are One end of the second twisted part is connected to the other end of the intermediate part, and the other end of the second twisted part is connected to the second straight part after being twisted.

5. The heat exchanger according to claim 1, characterized in that: the middle part is a flat tube The first straight portion and the second straight portion are perpendicular or substantially perpendicular to the arch axis or the approximate arc axis of the middle portion.

6. The heat exchanger according to claim 1, characterized in that: there is no welding between each of the two adjacent flat tubes between their opposite first twisted parts and between their opposite second twisted parts. Said fins.

7. A processing method for a heat exchanger, which includes the following steps:

51. Provide several straight flat tubes. Taking the middle part of each flat tube as a reference, the first straight part located on one side of the middle part and the second straight part located on the other side of the middle part are evenly spaced. Twisted relative to the middle portion, and the first straight portion and the second straight portion after twisting are substantially located in the same plane;

52. Bend the middle part so that the first straight part and the second straight part are close to each other, and the first straight part and the second straight part after bending still roughly in the same plane;

53. A first header and a second header are provided. The first and second headers are each provided with a number of punched holes. The first straight portion is inserted into the corresponding hole of the first header. Insert the second straight portion into the corresponding punching hole of the second header, and between the adjacent first straight portions and between the adjacent second flat portions Arrange fins between straight sections; and

54. Weld the flat tube to the first and second headers, and weld the fins to the flat tube to finally obtain a bent heat exchanger.

8. The heat exchanger processing method according to claim 7, characterized in that: in the step

In S1, the twist angle of the first straight part relative to the middle part is less than or equal to 90 degrees, the twist angle of the second straight part relative to the middle part is less than or equal to 90 degrees, and the third straight part has a twist angle of less than or equal to 90 degrees relative to the middle part. A straight portion and the second straight portion twist in the same or opposite direction relative to the middle portion.

9. The heat exchanger processing method according to claim 7, characterized in that: in step S2, the first straight portion and the second straight portion after bending are located in the same horizontal plane, and The angle between the first straight portion and the second straight portion is less than or equal to 90 degrees.

10. The heat exchanger processing method according to claim 7, characterized in that: in step S1, a third straight portion is provided between the middle portion and the first straight portion of each flat tube. A twisting part, a second twisting part is provided between the middle part and the second straight part of each flat tube; a twisting structure is formed in the first twisting part and the second twisting part, so that The first straight portion and the second straight portion are twisted to a certain extent relative to the middle portion.

11. The processing method of a heat exchanger according to claim 10, characterized in that: in step S1, one end of the first twisted part away from the middle part is twisted at a certain angle and then aligned with the first flat part. The straight part is connected so that the first straight part is twisted to a certain extent relative to the middle part; and then the end of the second twisted part away from the middle part is twisted at a certain angle and then connected to the second straight part. parts are connected, so that the second straight part forms a certain degree of twist with respect to the middle part, and at the same time, the first straight part and the second straight part are substantially located in the same plane.

12. The heat exchanger processing method according to claim 7, characterized in that: in step S2, the middle part is bent into an arch shape or a roughly changed shape, and at the same time, the first straight part is And the second straight portion is perpendicular or substantially perpendicular to the axis of the bent middle portion or the approximate arch axis.

13. A processing method for a heat exchanger, which includes the following steps:

s, provide a number of straight flat tubes, and take the middle part of each flat tube as a basis to arrange the first straight part on one side of the middle part and the second straight part on the other side of the middle part. Twisted relative to the middle portion, and the first straight portion and the second straight portion after twisting are generally located in the same plane and on the same straight line;

S2', provides a first header and a second header, the first and second headers are both A plurality of punching holes are provided, the first straight part is inserted into the corresponding punching hole of the first header, and the second straight part is inserted into the corresponding punching hole of the second header, and fins are arranged between adjacent first straight portions and between adjacent second straight portions;

S3', weld the flat tube to the first and second headers, and weld the fins to the flat tube to obtain a straight heat exchanger; and

S4', keep the relative positional relationship between the fins and the first and second straight parts unchanged, and bend the middle part to bring the first and second headers closer to each other, and finally obtain A bent heat exchanger.

14. The heat exchanger processing method according to claim 13, characterized in that: in step S1', the twist angle of the first straight part relative to the middle part is less than or equal to 90 degrees, so The twisting angle of the second straight portion relative to the middle portion is less than or equal to 90 degrees, and the twisting directions of the first straight portion and the second straight portion relative to the middle portion are the same or opposite.

15. The heat exchanger processing method according to claim 13, characterized in that: in step S4', the first straight part and the second straight part after bending are located in the same horizontal plane, And the angle between the first straight part and the second straight part is less than or equal to 90 degrees.

16. The heat exchanger processing method according to claim 13, characterized in that: in step S4', clamps are provided on both sides of the middle part to maintain the fins and the first , the relative positional relationship of the second straight part remains unchanged, and then the middle part is bent.

17. The heat exchanger processing method according to claim 13, characterized in that: in step S1', a a first twisting part, a second twisting part is provided between the middle part and the second straight part of each flat tube; a twisting structure is formed in the first twisting part and the second twisting part, so that the mentioned A straight portion and a second straight portion form a certain degree of twist relative to the middle portion.

18. The processing method of a heat exchanger according to claim 17, characterized in that: in step S1', one end of the first twisting part away from the middle part is twisted at a certain angle and then connected to the first twisting part. The straight parts are connected so that the first straight part is twisted to a certain extent relative to the middle part; and then the end of the second twisted part away from the middle part is set at a certain angle and connected to the second straight part. parts are connected, so that the second straight part forms a certain degree of twist with respect to the middle part, and at the same time, the first straight part and the second straight part are generally located in the same plane, and the The extending directions of the first straight portion and the second straight portion are also located on the same straight line or substantially on the same straight line.

19. The method of processing a heat exchanger according to claim 13, characterized in that: in step S4', the middle part is bent into a modified shape or a substantially arch shape, and at the same time, the first flat part is made straight The first part and the second straight part are perpendicular or substantially perpendicular to the axis of change or the approximate axis of the bent middle part.